Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Contents
DEFINITIONS AND ABBREVIATIONS
Table 1: 132/33 kV 23 MVA Power Transformers and On-Load Tap Changer
Table 2: 132/33 kV 10 MVA Power Transformer – On load Tap changer
Table 3: 132/33 kV 15 MVA Power Transformer and On load Tap changer
Table 5: 132 kV Circuit Breaker
Table 6: 132 kV Isolators with Earthing Switches
Table 8: 33kV Outdoor Circuit Breaker
Table 9: 33 kV Isolators with Earthing Switches
Table 10: 132 kV Voltage Transformer
Table 11: 132kV Current Transformer
Table 12: 132kV Surge Arresters
Table 14:33kV Surge Arresters
Table 15:Busbar Conductor ACSR 435/55 mm²
Table 16: Busbar Shield Wire
Table 17: 33kV Current Transformer
Table 18: 33kV Surge Arresters
Table 19: 132kV Dead-End and Suspension Insulators - Discs
Table 20: 132kV Post-Type Insulators
Table 21: 33/0.4kV Auxiliary Transformer
Table 22: Low Voltage AC Distribution Panel for Auxiliary Services
Table 23: Battery Bank 110 V DC, 300 Ah
Table 24: Battery Charger
Table 25: Protection Relays
Table 26: Telecommunication System
Table 27: Control and Monitoring System
Table 28: Under Ground Cable
Table 29: 132 kV Isolators without Earthing Switches
Table 30: 33 kV Isolators without Earthing Switches
Page | 1
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
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93
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
DEFINITIONS AND ABBREVIATIONS
The following terms may be met in these Technical Schedules and shall be interpreted as follows:
Hz
shall mean hertz
kW
shall mean kilowatt
MW
shall mean megawatt
VA (kVA, MVA)
shall mean volt-ampere (kilo-, mega-)
A (kA)
shall mean ampere (kilo-)
V (kV)
shall mean volt (kilo-)
W/m
shall mean watt per metre
AC
shall mean alternating current
DC
shall mean direct current
IN
shall mean rated (nominal) current
UN
shall mean rated (nominal) voltage
Ah
shall mean ampere-hours
lm
shall mean lumen
lm/w
shall mean lumen per watt
min
shall mean minute
min.
shall mean minimum
(prefix)
shall mean micro
rms
shall mean root mean square
p.u.
shall mean per unit
p/p
shall mean peak to peak
T
shall mean Tesla
kg
shall mean kilogram
N
shall mean Newton
l
shall mean litre
s or sec.
shall mean second
No.
shall mean number
dB
shall mean decibel
Amp
shall mean amperes
F
shall mean Farad
oC
shall mean centigrade
K
shall mean degree Kelvin
m2
shall mean square metre (mm2 for millimetre, etc)
m3
shall mean cubic metre (mm3 for millimetre, etc)
m3/s
shall mean cubic metres per second
m
shall mean metre
cm
shall mean centimetre
mm
shall mean millimetre
joules
shall mean joules per hour
tonne
shall mean metric tonne
Page | 2
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
%
Pascal
cst
Lot 3A Substation Technical Schedules –Substations
shall mean percentage
1 N/m2
shall mean centistoke
Page | 3
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 1: 132/33 kV 23 MVA Power Transformers and On-Load Tap Changer
Minimum Requirements
Description
Unit
Manufacturer
Data offered by Bidder
Data
to be
specified
Type
3-phase, oilimmersed,
with on-load
tap changer
Installation
outdoor
Rated maximum voltage (Primary / Secondary)
kV
145 / 36
 Primary side (high voltage)
kV
132
 Secondary side (low voltage)
kV
33
 HV, principal tapping
kV
to be
specified
 HV, extreme plus tapping
kV
to be
specified
 HV, extreme minus tapping
kV
to be
specified
 LV
kV
to be
specified
MVA
23
Rated service voltage
Rated no-load voltage at rated frequency on:
Rated power ONAN
[Performance Guarantee]
Page | 4
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Hz
50
 Primary side (high voltage)
A
to be
specified
 Secondary side (low voltage)
A
to be
specified
Rated frequency
Data offered by Bidder
Rated current
Vector group
Dyn1
Impedance voltage of:
 ONAN centre tap
%
Insulation
9.8
uniform
Type of cooling
ONAN
Tapping range
± 1.67%
in ± 8 steps
No-load losses at rated frequency and 100% voltage maximum value [Performance Guarantee]
kW
to be
specified
 ONAN
kW
to be
specified
 ONAF
kW
to be
specified
Load losses at rated frequency and 100% voltage (75°C)
- maximum value: [Performance Guarantee]
Material of winding
copper
Temperature rise at rated power over 40°C maximum
ambient [Performance Guarantee]
 oil (upper level)
°C
55
Page | 5
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
°C
60
kV
275/70
 HV windings
kV peak
650
 LV windings
kV peak
170
 At principal tap: high voltage - low voltage
 / phase
to be
specified
 At extreme plus tap: high voltage - low
 / phase
to be
specified
 / phase
to be
specified
dB (A)
70
% In
0.2
 winding
Rated power frequency withstand voltage HV/LV
Data offered by Bidder
Rated lightning impulse withstand voltage:
Short circuit impedance referred to the first winding in
the following pairs: [Performance Guarantee]
voltage
 At extreme minus tap: high voltage - low
voltage
Maximum noise level (Lp) [Performance Guarantee]
Maximum no-load current
Painting
Admiralty
Grey shade
No. 632 as
per BS 381C
Dimensions
 length
mm
to be
specified
 width
mm
to be
specified
Page | 6
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
 height
mm
to be
specified
 distance between wheels' centres
mm
to be
specified
Total weight
kg
to be
specified
Oil weight
kg
to be
specified
Applicable standard(s)
Data offered by Bidder
IEC 60076
IEC 60354
Transformer Bushings
Maximum current carrying capacity of bushings:
 HV
A
120% of IN
 LV
A
120% of IN
 HV
kV
132
 LV
kV
33
 HV, neutral
kV
To
specified
be
 LV, neutral
kV
to
specified
be
Rated service voltage of bushings:
Page | 7
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data offered by Bidder
Data
1 minute, 50 Hz dry withstand voltage:
 HV bushing
kV
to
specified
be
 LV bushing
kV
to
specified
be
 TV bushing
kV
to
specified
be
 HV, LV neutral bushings
kV
to
specified
be
 HV bushing
kV
to
specified
be
 LV bushing
kV
to
specified
be
 TV bushing
kV
to
specified
be
 HV, LV neutral bushings
kV
to
specified
be
 HV bushing
kV
to
specified
be
 LV bushing
kV
to
specified
be
1 minute, 50 Hz wet withstand voltage:
Impulse withstand voltage:
Page | 8
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
On-Load Tap Changer
Manufacturer
Data offered by Bidder
Data
to be
specified
Type
to be
specified
Rated current
A
175
 1 second (maximum)
kA
31.5
 3 seconds
kA
to
specified
Rated short-time current
Step voltage
V
Number of steps
to be
specified
17
On-load tap changer
Minimum number of operations
be
±8 x 1.67%
operations
200,000
Motor drive
 Type
to be
specified
 Supply voltage
V
400/230
kV rms
to be
specified
 Voltage to earth
kV rms
to be
specified
 Impulse test voltage
kV peak
to be
 Insulation level voltage to earth
Insulation level
Page | 9
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data offered by Bidder
Data
specified
 One-minute power frequency test voltage
kV rms
to be
specified
kV peak
to be
specified
kV rms
to be
specified
kV peak
to be
specified
kV rms
to be
specified
kV peak
to be
specified
kV rms
to be
specified
(50 Hz)
Internal insulation levels / one-minute power frequency
test voltage:
 between selected and pre-selected tap
 across fine tap winding
 between phases of fine tap winding
Page | 10
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 2: 132/33 kV 10 MVA Power Transformer – On load Tap changer
Minimum Requirements
Description
Unit
Data
Manufacturer
2
kV
to be
specified
3-phase, oilimmersed,
with on-load
tap changer
outdoor
145 / 36
kV
kV
132
33
HV, principal tapping
kV
HV, extreme plus tapping
kV
HV, extreme minus tapping
kV
LV
kV
to be
specified
to be
specified
to be
specified
to be
specified
Type
Installation
Rated maximum voltage (Primary / Secondary)
Rated service voltage
Primary side (high voltage)
Secondary side (low voltage)
Data offered by
Bidder
Rated no-load voltage at rated frequency on:
Rated power ONAN
[Performance Guarantee]
Rated frequency
Rated current
Primary side (high voltage)
Secondary side (low voltage)
Vector group
Impedance voltage of:
ONAN centre tap
Insulation
Type of cooling
Tapping range
MVA
10
Hz
50
A
to be
specified
to be
specified
Dyn11
A
%
9.8
uniform
ONAN
± 1.67%
Page | 11
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
No-load losses at rated frequency and 100% voltage - maximum value [Performance Guarantee]
Load losses at rated frequency and 100% voltage
(75°C) - maximum value: [Performance Guarantee]
ONAN
ONAF
Unit
Data
kW
in ± 8 steps
to be
specified
kW
kW
to be
specified
to be
specified
copper
Material of winding
Temperature rise at rated power over 40°C maximum ambient [Performance Guarantee]
oil (upper level)
winding
Rated power frequency withstand voltage HV/LV
Rated lightning impulse withstand voltage:
HV windings
LV windings
°C
°C
kV
55
60
275/70
kV peak
kV peak
650
170
Short circuit impedance referred to the first winding
in the following pairs: [Performance Guarantee]
At principal tap: high voltage - low voltage
 / phase
to be
specified
to be
specified
to be
specified
70
At extreme plus tap: high voltage - low voltage
 / phase
At extreme minus tap: high voltage - low voltage
 / phase
Maximum noise level (Lp) [Performance Guarantee]
Maximum no-load current
Painting
dB (A)
% In
0.2
Admiralty
Grey shade
No. 632 as
per BS 381C
Dimensions
length
mm
width
mm
height
mm
to be
specified
to be
specified
to be
Data offered by
Bidder
Page | 12
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
distance between wheels' centres
Unit
mm
Total weight
kg
Oil weight
kg
Applicable standard(s)
Data
Data offered by
Bidder
specified
to be
specified
to be
specified
to be
specified
IEC 60076
IEC 60354
Transformer Bushings
Maximum current carrying capacity of bushings:
HV
LV
A
A
Rated service voltage of bushings:
HV
LV
HV, neutral
kV
kV
kV
LV, neutral
1 minute, 50 Hz dry withstand voltage:
HV bushing
kV
kV
LV bushing
kV
TV bushing
kV
HV, LV neutral bushings
kV
1 minute, 50 Hz wet withstand voltage:
HV bushing
kV
LV bushing
kV
TV bushing
kV
120% of IN
120% of IN
132
33
to be
specified
to be
specified
to be
specified
to be
specified
to be
specified
to be
specified
to be
specified
to be
specified
to be
Page | 13
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
HV, LV neutral bushings
Impulse withstand voltage:
HV bushing
LV bushing
Unit
Data
kV
specified
to
be
specified
kV
kV
Data offered by
Bidder
to
be
specified
to
be
specified
On-Load Tap Changer
Manufacturer
Type
Rated current
Rated short-time current
1 second (maximum)
3 seconds
kA
kA
Step voltage
V
Number of steps
On-load tap changer
Minimum number of operations
Motor drive
Type
Supply voltage
Insulation level voltage to earth
Insulation level
Voltage to earth
Impulse test voltage
One-minute power frequency test voltage (50
Hz)
Internal insulation levels / one-minute power fre-
A
operations
V
kV rms
kV rms
kV peak
kV rms
to be
specified
to be
specified
175
31.5
to
be
specified
to be
specified
17
±8 x 1.67%
200,000
to be
specified
400/230
to be
specified
to be
specified
to be
specified
to be
specified
Page | 14
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
quency test voltage:
between selected and pre-selected tap
Unit
Data
kV peak
to be
specified
to be
specified
to be
specified
to be
specified
to be
specified
to be
specified
kV rms
across fine tap winding
kV peak
kV rms
between phases of fine tap winding
kV peak
kV rms
Data offered by
Bidder
Page | 15
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 3: 132/33 kV 15 MVA Power Transformer and On load Tap changer
Minimum Requirements
Description
Unit
Data
kV
to be
specified
3-phase, oilimmersed,
with on-load
tap changer
outdoor
145 / 36
kV
kV
132
33
HV, principal tapping
kV
HV, extreme plus tapping
kV
HV, extreme minus tapping
kV
LV
kV
to be
specified
to be
specified
to be
specified
to be
specified
Manufacturer
Type
Installation
Rated maximum voltage (Primary / Secondary)
Rated service voltage
Primary side (high voltage)
Secondary side (low voltage)
Data offered by
Bidder
Rated no-load voltage at rated frequency on:
Rated power ONAN
[Performance Guarantee]
Rated frequency
Rated current
Primary side (high voltage)
Secondary side (low voltage)
Vector group
Impedance voltage of:
ONAN centre tap
Insulation
Type of cooling
MVA
15
Hz
50
A
A
to be
specified
to be
specified
Dyn11
%
9.8
uniform
ONAN
Page | 16
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Tapping range
No-load losses at rated frequency and 100% voltage - maximum value [Performance Guarantee]
Load losses at rated frequency and 100% voltage
(75°C) - maximum value: [Performance Guarantee]
ONAN
ONAF
kW
kW
Data
± 1.67%
in ± 8 steps
to be
specified
kW
to be
specified
to be
specified
copper
Material of winding
Temperature rise at rated power over 40°C maximum ambient [Performance Guarantee]
oil (upper level)
winding
Rated power frequency withstand voltage HV/LV
Rated lightning impulse withstand voltage:
HV windings
LV windings
°C
°C
kV
55
60
275/70
kV peak
kV peak
650
170
Short circuit impedance referred to the first winding
in the following pairs: [Performance Guarantee]
At principal tap: high voltage - low voltage
 / phase
to be
specified
to be
specified
to be
specified
70
At extreme plus tap: high voltage - low voltage
 / phase
At extreme minus tap: high voltage - low voltage
 / phase
Maximum noise level (Lp) [Performance Guarantee]
Maximum no-load current
Painting
dB (A)
Data offered by
Bidder
% In
0.2
Admiralty
Grey shade
No. 632 as
per BS 381C
Dimensions
length
mm
width
mm
to be
specified
to be
specified
Page | 17
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
height
mm
distance between wheels' centres
mm
to be
specified
to be
specified
to be
specified
to be
specified
IEC 60076
IEC 60354
Total weight
kg
Oil weight
kg
Applicable standard(s)
Data offered by
Bidder
Transformer Bushings
Maximum current carrying capacity of bushings:
HV
LV
A
A
120% of IN
120% of IN
Rated service voltage of bushings:
HV
LV
HV, neutral
kV
kV
kV
132
33
LV, neutral
1 minute, 50 Hz dry withstand voltage:
HV bushing
kV
kV
LV bushing
kV
TV bushing
kV
HV, LV neutral bushings
kV
1 minute, 50 Hz wet withstand voltage:
HV bushing
LV bushing
kV
kV
to
be
specified
to
be
specified
to
specified
to
specified
to
specified
to
specified
be
be
be
be
to
be
specified
to
be
specified
Page | 18
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
TV bushing
kV
HV, LV neutral bushings
kV
to
be
specified
to
be
specified
Impulse withstand voltage:
HV bushing
LV bushing
kV
kV
On-Load Tap Changer
Manufacturer
Type
Rated current
Rated short-time current
1 second (maximum)
3 seconds
kA
kA
Step voltage
V
Number of steps
On-load tap changer
Minimum number of operations
Motor drive
Type
Supply voltage
Insulation level voltage to earth
Insulation level
Voltage to earth
A
operations
V
kV rms
kV rms
Impulse test voltage
kV peak
One-minute power frequency test voltage (50
Hz)
kV rms
Data offered by
Bidder
to
be
specified
to
be
specified
to be
specified
to be
specified
33
31.5
to
be
specified
to be
specified
17
±8 x 1.67%
200,000
to be
specified
400/230
to be
specified
to be
specified
to be
specified
to be
specified
Page | 19
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Internal insulation levels / one-minute power frequency test voltage:
between selected and pre-selected tap
Unit
Data
kV peak
to be
specified
to be
specified
to be
specified
to be
specified
to be
specified
to be
specified
kV rms
across fine tap winding
kV peak
kV rms
between phases of fine tap winding
kV peak
kV rms
Data offered by
Bidder
Page | 20
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 5: 132 kV Circuit Breaker
Minimum Requirements
Description
Unit
Data
Manufacturer
to be specified
Type of circuit breaker
outdoor type
Type of arc quenching medium
Data offered by
Bidder
SF6
Model
to be specified
Rated maximum voltage
kV
145
Rated service voltage
kV
132
kV peak
650
kV rms
275
Hz
50
Rated lightning impulse (BIL)
(at altitude less than 1000 M)
Power frequency withstand voltage
(at altitude less than 1000 M)
Rated frequency
Number of phases
3
Rated current
A
1600
Short circuit breaking current
kA
31.5
 Short time withstand
sec.
1
 DC component time constant
ms
45
Maximum breaking time
ms
50
Maximum closing time
ms
100
kA peak
100
Related short circuit making current
Number of tripping coils
2
Page | 21
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Number of closing coils
Data
1
Rated power of trip coils
w
Rated power of closing coil
w
Operating sequence
-
O – 0.3 s – CO –
3 min – CO
Annual rate of gas leakage at normal pressure
%
≤ 1%
mm/kV
31
Minimum creepage distance
Data offered by
Bidder
Rated TRV for faults at terminals
 TRV crest value
 TRV rate of rise
 Initial TRV
 Time to crest of initial TRV
to be specified
kV
218
kV/s
2
kV
1.4
micro s
0.4
First pole to clear factor
1.5
Maximum over voltage factors for any switching duty
P.U
2.3
Maximum over voltage factors when interrupting rated
line/cable/capacitor banks charging currents
P.U
2.3
Maximum over voltage factors when switching small
inductive and reactive current
P.U
2.3
Maximum time interval between closure of first and
last phase of three phase circuit breaker
ms
3
Minimum time from extinction of main arc to contact
make during autoreclsoe time
Operating mechanism
Page | 22
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
 Type
Data offered by
Bidder
Data
to be specified
 Motor voltage
 Rated power of motor
V DC
110
W
 Type of device (Motor charged)
Spring or
hydraulic
-For closing
For opening
 Closing and opening coil voltage
V DC
 Number of closing coils
 Spring charging time
110
1
s
to be specified
 Manual spring release
yes
 Hand operating facilty
yes
 Mechanical Interlocking facility with isolators
yes
 Emergency trip facility
yes
 Mechanical On and OFF indicators
yes
 Number of opening coils
2
 Number of auxiliary contacts available
5 No., 5 NC
Main dimensions:
 Depth
mm
to be specified
 Height
mm
to be specified
kg
to be specified
Weight
Accessories in the motor mech. enclosure
 Operation counter
yes
Page | 23
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
 Local manual control
yes
 Test switches (dc)
yes
 Heater
yes
Weatherproof, corrosion resistance enclosure
Data offered by
Bidder
IP65
Accessories in the central control panel
 Anti-pumping relay
yes
 Local/distance command selector switch
yes
 Local operation push buttons
yes
 Minimum pressure lock-out and alarm relay
yes
 Lighting, heating and service plug
yes
 Terminal blocks
yes
 Test switches (DC)
yes
 Phase discrepancy timer relay
yes
 Mounting brackets and hardware
yes
With all necessary accessories for installation
to be specified
Applicable standard(s)
IEC 62271-100
Page | 24
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 6: 132 kV Isolators with Earthing Switches
Description
Manufacturer
Type
Installation
Rated maximum voltage
Rated service voltage
Rated lightning impulse (BIL)(at altitude less than 1000 M)
Power frequency withstand voltage (at altitude less than 1000 M)
Rated short-time current
Rated frequency
Number of poles
Rated current
Minimum creepage distance
Operation
Opening time
Closing time
Rated peak withstand current
Minimum clearance in air:
 Between poles
 To earth
 For isolating distance
Type of operating mechanism:
 For disconnector
 For earthing switch
Rated supply voltage for operating mechanism
Current required at rated supply voltage to operate isolator:
Hand operating facility
Locking arrangement in Off and On
Automatic isolation of control supplies when lock off
Rated power of operating coil
Rated Motor power
Facing of terminals and contacts
Shape of terminals of the main circuit
Number and type of auxiliary switches:

Tin plated for Isolator
 For the disconnector
 For the earth switch
Auxiliary contact rating
Wind load
Minimum Requirements
Unit
Data
sec.
sec.
kA
to be specified
to be specified
outdoor
145
132
650
275
31.5
50
3
1600
31
motorized
≤ 30
≤ 30
100
mm
mm
mm
1600
1300
to be specified
kV
kV
kV peak
kV rms
kA
Hz
A
mm/kV
motor
manual
V DC
A
110
to be specified
yes
yes
yes
W
W
to be specified
to be specified
Yes
5 NO , 5 NC
to be specified
A
Pa
> 10
to be specified
Page | 25
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
(N/mm²)
Mechanical terminals load:
 Straight load
 Cross load
Weight of complete disconnector:
 With earthing switch
 Without earthing switch
Approximate dimensions in open position
Approximate dimensions in close position
With all accessories for installation
Applicable Standard(s)
N
N
500
170
kg
kg
to be specified
to be specified
mm
mm
to be specified
to be specified
to be specified
IEC 62271-102
Page | 26
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 8: 33kV Outdoor Circuit Breaker
Minimum Requirements
Description
Unit
Data
Manufacturer
to be specified
Type of circuit breaker
outdoor type
Type of arc quenching medium
Data offered by
Bidder
Vacuum
Model
to be specified
Rated maximum voltage
kV
36
Rated service voltage
kV
33
kV peak
170
kV rms
70
Hz
50
Rated lightning impulse (BIL)
(at altitude less than 1000 M)
Power frequency withstand voltage
(at altitude less than 1000 M)
Rated frequency
Number of phases
Rated current
3
A
Incomers and feeders
800
Bus coupler
1200
Short circuit breaking current
kA
25
6.0 Short time withstand
sec.
1
7.0 DC component time constant
ms
45
Maximum breaking time
ms
50
Maximum closing time
ms
120
kA peak
62.5
Related short circuit making current
Page | 27
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Number of tripping coils
2
Number of closing coils
1
Operating sequence
-
O - 0.3 s - CO - 3
min - CO
Annual rate of gas leakage at normal pressure
%
≤ 1%
mm/kV
25
Minimum creepage distance
Data offered by
Bidder
Operating mechanism
to be specified
8.0 Type
9.0 Motor voltage
V DC
110
10.0 Motor power rating
KW
to be specified
11.0 Closing and opening coil voltage
V DC
110
12.0 Number of closing coils
1
13.0 Number of opening coils
2
14.0 Spring charge time
s
to be specified
15.0 Manual release spring
yes
16.0 Hand operating facility
yes
17.0 Emergency trip facility
yes
18.0 Mechanical Off and On indicators
yes
5 No., 5 NC
19.0 Number of auxiliary contacts available
Main dimensions:
20.0 Depth
mm
to be specified
21.0 Height
mm
to be specified
kg
to be specified
Weight
Page | 28
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data offered by
Bidder
Data
Accessories in the motor mech. enclosure
22.0 Operation counter
yes
23.0 Local manual control
yes
24.0 Test switches (dc)
yes
25.0 Heater
yes
Weatherproof, corrosion resistance enclosure
IP65
Accessories in the central control panel
26.0 Anti-pumping relay
yes
27.0 Local/distance command selector switch
yes
28.0 Local operation push buttons
yes
29.0 Minimum pressure lock-out and alarm
relay
30.0 Lighting, heating and service plug
yes
31.0 Terminal blocks
yes
32.0 Test switches (DC)
yes
33.0 Phase discrepancy timer relay
yes
34.0 Mounting brackets and hardware
yes
yes
With all necessary accessories for installation
to be specified
Applicable standard(s)
IEC 62271-100
Page | 29
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 9: 33 kV Isolators with Earthing Switches
Minimum Requirements
Description
Unit
Data
Manufacturer
to be specified
Type
to be specified
Installation
outdoor
Rated maximum voltage
kV
36
Rated service voltage
kV
33
Rated lightning impulse (BIL)(at altitude less than 1000 M)
kV peak
170
Power frequency withstand voltage (at altitude less than 1000 M)
kV rms
70
Rated short-time current
kA
25
Rated frequency
Hz
50
Number of poles
Rated current
3
A
Hand operating facility
800
yes
Locking arrangement in Off and On
yesyes
Automatic isolation of control supplies when lockoff
yesyes
Rated power of operating coil
W
Rated Motor power
W
Minimum creepage distance
mm/kV
Operation
31
motorized
Opening time
sec.
≤ 30
Page | 30
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Closing time
sec.
≤ 30
Rated peak withstand current
kA
100
mm
500
7.0 To earth
mm
435
8.0 For isolating distance
mm
to be specified
Minimum clearance in air:
6.0 Between poles
Type of operating mechanism:
Motorised
9.0 For disconnector
manual
10.0 For earthing switch
Rated supply voltage for operating mechanism
Current required at rated supply voltage to operate isolator:
V DC
110
A
to be specified
Facing of terminals and contacts
to be specified
Shape of terminals of the main circuit
to be specified
Number and type of auxiliary switches:
11.0 For the disconnector
5 NO , 5 NC
12.0 For the earth switch
to be specified
Auxiliary contact rating
A
> 10
Pa
(N/mm²)
to be specified
13.0 Straight load
N
500
14.0 Cross load
N
170
Wind load
Mechanical terminals load:
Weight of complete disconnector:
Page | 31
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
15.0 With earthing switch
kg
to be specified
16.0 Without earthing switch
kg
to be specified
Approximate dimensions in open position
mm
to be specified
Approximate dimensions in close position
mm
to be specified
With all accessories for installation
to be specified
Applicable Standard(s)
IEC 62271-102
Page | 32
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Table 10:
Lot 3A Substation Technical Schedules –Substations
132 kV Voltage Transformer
Minimum Requirements
Description
Manufacturer's name
Type
Model
Installation
Execution
Rated maximum voltage
Rated primary voltage
Rated secondary voltage (second winding)
Rated secondary voltage (third winding)
Rated frequency
Impulse withstand voltage 1.2/50 micro s wave
Unit
Data
Data offered by
Bidder
to be indicated
to be specified
to be specified
outdoor
kV
kV
kV
kV
Hz
kV peak
145
132/√3
0.1/√3
0.1/√3
50
650
kV rms
275
kV rms
2
VA
100/100
(at altitude less than 1000 M)
Power frequency withstand voltage
(at altitude less than 1000 M)
Power frequency withstand voltage secondary
winding
Rated output (second winding/ third winding):
Accuracy class
6.0 For metering
7.0 For measuring
8.0 For protection
Voltage factor at rated voltage:
9.0 Continuous
10.0 30 second
Thermal limit burden
Normal temperature rise:
11.0 Winding
12.0 Oil
Maximum temperature rise under short circuit conditions:
13.0 Winding
14.0 Oil
Total height
Minimum creepage distance:
Size and section of terminals bolts
Weight of oil per pole
Weight total per pole
0.2
0.5
3P
°C
°C
1.2
1.5
to be specified
28
50
45
°C
°C
mm
mm/kv
mm
kg
kg
to be specified
to be specified
to be specified
31
to be specified
to be specified
to be specified
VA
Page | 33
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Type of oil and reference specification
Permissible secondary short circuit current
Applicable standard(s)
Unit
A
Data
Data offered by
Bidder
to be specified
to be specified
IEC 60044-2
60044-5
Page | 34
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 11:
Lot 3A Substation Technical Schedules –Substations
132kV Current Transformer
Minimum Requirements
Description
Unit
Data
Manufacturer's name
to be indicated
Type
to be specified
Model
to be specified
Installation
outdoor
Rated maximum voltage
kV
145
Rated service voltage
kV
132
Rated lightning impulse (BIL) (at altitude less than 1000 M)
kV
650
Power frequency withstand voltage (at altitude less than 1000 M)
kV
275
Rated frequency
Hz
50
A
800 - 400 - 200
A
800 - 400 - 200
A
1-1-1
Rated primary current
6.0 for line feeder
7.0 for transformer feeder
Rated secondary currents
Number of cores:
8.0 for measuring purposes
1
9.0 for metering purposes
1
10.0 for protection purposes
2
11.0 for busbar purposes
1
Rated burden for measuring core
VA
Accuracy class
Rated burden for metering core
15
0.5 M 5
VA
30
Page | 35
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Accuracy class
Rated burden for protection cores
0.2
VA
Accuracy class
Rating for Diferential, Busbarandd Restricted earth fault cores
Accuracy
Data
30
5 P 20
VA
30
i) Class
ii)Vk
to be specified
iii)Im at
Vk
Short-time current ratings:
12.0 Thermal (Ith)
kA
31.5
13.0 Dynamic (Idyn)
kA
80
The minimum guaranteed instrument security factor, for metering
current transformer
to be specified
Impulse wave
to be specified
Mechanical load of primary terminal:
14.0 Dynamic load
N
to be specified
15.0 Static load
N
to be specified
mm
to be specified
mm/kV
31
Minimum clearance
Minimum creepage distance
Size and section of terminal bolts
to be specified
Weight per pole
kg
to be specified
Weight of oil per pole
kg
to be specified
Type of oil and reference specification
to be specified
Page | 36
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Dimensions
mm
to be specified
With all accessories for installation
Applicable standard(s)
to be specified
IEC 60044-1
Page | 37
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 12: 132kV Surge Arresters
Minimum Requirements
Description
Unit
Data
Manufacturer's name
to be indicated
Type
to be specified
Installation
outdoor
Nominal system voltage
kV
132
Rated operating voltage (Ur)
kV
108
Rated continuous operating voltage (Uc)
kV
84
Rated frequency
Hz
50
Nominal discharge current
kA
10
6.0 Lightning current 8/20 impulse
kV
to be specified
7.0
Step current 1/20 impulse of 10 kA
kV
to be specified
Switching current 30/60 impulse of 500 A/1000 A
kV
to be specified
High current 4/10 impulse withstand value
kA
100
Low current, long duration current impulse withstand
(upper value)
A
1000
Residual voltage for:
Line discharge class
3
Absorption capability in kJ/kV of arrester rating at
thermal stability
kJ/kV
8
Pressure relief class
class
A
Suitability for fault current
kA
40
Power frequency 1 min. withstand voltage, wet (at
kV
275
Page | 38
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Maximum RIV at 1000 kHz measured at 1.05 time the
system highest voltage
micro V
500
Impulse withstand voltage of arrester insulation
external assembly (at altitude less than 1000 M)
kV crest
650
Maximum short circuit rating
kA
31.5
Overall height of arrester
mm
to be specified
Creepage distance
mm/kV
31
Weight of arrester
kg
to be specified
altitude less than 1000 M)
Arrester classification
heavy duty, stationtype gapless metal
oxide or equivalent
Accessories: 132 kV surge arrester discharge counter
8.0 Type
outdoor
9.0 Counter indication
digital
10.0 Protection class
IP 54
11.0 Number per 3 arresters
Applicable Standard(s)
1
IEC 60099-1, 1A, 2,
4
Page | 39
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Table 13:
Lot 3A Substation Technical Schedules –Substations
33kV Voltage Transformer
Description
Manufacturer's name
Type
Model
Installation
Execution
Rated maximum voltage
Rated primary voltage
Rated secondary voltage (second winding)
Rated secondary voltage (third winding)
Rated frequency
Impulse withstand voltage 1.2/50 micro s wave
Minimum Requirements
Unit
Data
Data offered by
Bidder
to be indicated
to be specified
to be specified
outdoor
kV
kV
kV
kV
Hz
kV peak
36
33/√3
0.1/√3
0.1/√3
50
170
kV rms
70
kV rms
2
VA
100/100
(at altitude less than 1000 M)
Power frequency withstand voltage
(at altitude less than 1000 M)
Power frequency withstand voltage secondary
winding
Rated output (second winding/ third winding):
Accuracy class
6.0 For metering
7.0 For measuring
8.0 For protection
Voltage factor at rated voltage:
9.0 Continuous
10.0 30 second
Thermal limit burden
Normal temperature rise:
11.0 Winding
12.0 Oil
Maximum temperature rise under short circuit conditions:
13.0 Winding
14.0 Oil
Total height
Minimum creepage distance:
Size and section of terminals bolts
Weight of oil per pole
Weight total per pole
Type of oil and reference specification
0.2
0.5
3P
VA
°C
°C
°C
°C
mm
mm/kv
mm
kg
kg
1.2
1.5
to be specified
28
50
45
to be specified
to be specified
to be specified
31
to be specified
to be specified
to be specified
to be specified
Page | 40
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Permissible secondary short circuit current
Applicable standard(s)
Unit
Data
A
to be specified
IEC 60044-2,
60044-5
Data offered by
Bidder
Page | 41
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 14:33kV Surge Arresters
Minimum Requirements
Description
Unit
Data
Manufacturer's name
to be indicated
Type
to be specified
Installation
outdoor
Nominal system voltage
kV
33
Rated operating voltage (Ur)
kV
30
Rated continuous operating voltage (Uc)
kV
21
Rated frequency
Hz
50
Nominal discharge current
kA
10
kV
to be specified
kV
to be specified
Switching current 30/60 impulse of 500 A/1000 A
kV
to be specified
High current 4/10 impulse withstand value
kA
100
Low current, long duration current impulse withstand
(upper value)
A
1000
Residual voltage for:
6.0 Lightning current 8/20 impulse
7.0 Step current 1/20 impulse of 10 kA
Line discharge class
3
Absorption capability in kJ/kV of arrester rating at
thermal stability
kJ/kV
8
Pressure relief class
class
A
Suitability for fault current
kA
40
Power frequency 1 min. withstand voltage, wet
kV
70
Page | 42
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Maximum RIV at 1000 kHz measured at 1.05 time the
system highest voltage
micro V
500
Impulse withstand voltage of arrester insulation
external assembly
kV crest
170
Maximum short circuit rating
kA
25
Overall height of arrester
mm
to be specified
Creepage distance
mm/kV
31
Weight of arrester
kg
to be specified
Arrester classification
heavy duty, stationtype gapless metal
oxide or equivalent
Accessories: 132 kV surge arrester discharge counter
8.0 Type
outdoor
9.0 Counter indication
digital
10.0 Protection class
IP 54
11.0 Number per 3 arresters
Applicable Standard(s)
1
IEC 60099-1, 1A, 2,
4
Page | 43
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 15:Busbar Conductor ACSR 435/55 mm²
Minimum Requirements
Description
Unit
Data
Manufacturer's name
to be indicated
Type
Aluminium
conductor steelreinforced
(ACSR)
Nominal cross-section
mm²
Cross-section ratio Al/St approx.
Data offered by
Bidder
435/55
7.7
Steel
 Construction
mm
7 x 32
 Diameter
mm
9.6
 Cross-section
mm²
56.3
 Construction
mm
54.32
 Cross-section
mm²
434.3
 Total cross-section
mm²
490.6
Conductor diameter approx.
mm
28.8
 Steel
kg/km
44.1
 Aluminium
kg/km
1.199
 Without grease total approx.
kg/km
1.640
 With grease total approx.
kg/km
1.646
N
136.450
Aluminium
Conductor weight
Calculated conductor breaking load
Page | 44
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
ohm/km
0.067
Standard length per reel approx.
m
to be specified
Dispatch reel nominal size
m
to be specified
Current carrying capacity
A
2000
Calculated conductor resistance at 20 °C
Applicable Standard(s)
Data offered by
Bidder
IEC 60209
DIN 48 204
Page | 45
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 16:
Lot 3A Substation Technical Schedules –Substations
Busbar Shield Wire
Minimum Requirements
Description
Unit
Data offered by
Bidder
Data
Manufacturer's name
to be indicated
Material
steel galvanized
Cross-section
 Nominal cross section
mm²
50
 Actual cross section
mm²
49.48
number
7
Wire diameter
mm
3.00
Conductor diameter
mm
9
kg/km
391
kN
61.58 (St III)
g/mm²
5.188
Number of wires
Weight:
Calculated conductor braking load
Weight of zinc coating
Applicable Standard(s)
IEC 60076
IEC 60289
Page | 46
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 17: 33kV Current Transformer
Minimum Requirements
Description
Unit
Data
Manufacturer's name
to be indicated
Type
to be specified
Model
to be specified
Installation
Data offered by
Bidder
outdoor
Rated maximum voltage
kV
36
Rated service voltage
kV
33
Rated lightning impulse (BIL) (at altitude less than 1000 M)
kV
170
Power frequency withstand voltage (at altitude less than
kV
70
Hz
50
A
400 - 200 - 100
A
800 - 400 - 200
A
1-1-1
1000 M)
Rated frequency
Rated primary current
6.0 for line feeder
7.0 for transformer feeder
Rated secondary currents
Number of cones:
8.0 for measuring purposes
1
9.0 for metering purposes
1
10.0 for protection purposes
2
Rated burden for measuring core
VA
Accuracy class
Rated burden for metering core
30
0.5 M 5
VA
30
Page | 47
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Accuracy class
Rated burden for protection cores
Data offered by
Bidder
Data
0.2
VA
Accuracy class
30
5 P 20
Short-time current ratings:
11.0 Thermal (Ith)
kA
25
12.0 Dynamic (Idyn)
kA
60
The minimum guaranteed instrument security factor,
for metering current transformer
to be specified
Impulse wave
to be specified
Mechanical load of primary terminal:
13.0 Dynamic load
N
to be specified
14.0 Static load
N
to be specified
mm/kV
31
Minimum creepage distance
Size and section of terminal bolts
to be specified
Weight per pole
kg
to be specified
Weight of oil per pole
kg
to be specified
Type of oil and reference specification
Dimensions
to be specified
mm
With all accessories for installation
Applicable standard(s)
to be specified
to be specified
IEC 60044-1
Page | 48
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 18:
Lot 3A Substation Technical Schedules –Substations
33kV Surge Arresters
Minimum Requirements
Description
Manufacturer's name
Type
Installation
Nominal system voltage
Rated operating voltage (Ur)
Rated continuous operating voltage (Uc)
Rated frequency
Nominal discharge current
Residual voltage for:
6.0 Lightning current 8/20 impulse
7.0 Step current 1/20 impulse of 10 kA
Switching current 30/60 impulse of 500 A/1000 A
High current 4/10 impulse withstand value
Low current, long duration current impulse withstand (upper value)
Line discharge class
Absorption capability in kJ/kV of arrester rating at
thermal stability
Pressure relief class
Suitability for fault current
Power frequency 1 min. withstand voltage, wet
Maximum RIV at 1000 kHz measured at 1.05 time
the system highest voltage
Impulse withstand voltage of arrester insulation
external assembly
Maximum short circuit rating
Overall height of arrester
Creepage distance
Weight of arrester
Arrester classification
Accessories: 132 kV surge arrester discharge
counter
8.0 Type
Unit
Data
kV
kV
kV
Hz
kA
to be indicated
to be specified
outdoor
33
30
21
50
10
kV
kV
kV
kA
A
to be specified
to be specified
to be specified
100
1000
kJ/kV
3
8
class
kA
kV
micro V
A
40
70
500
kV crest
170
kA
mm
mm/kV
kg
25
to be specified
31
to be specified
heavy duty,
station-type
gapless metal
oxide or
equivalent
outdoor
Page | 49
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
9.0 Counter indication
10.0 Protection class
11.0 Number per 3 arresters
Applicable Standard(s)
Unit
Data
digital
IP 54
1
IEC 60099-1, 1A,
2, 4
Page | 50
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Table 19:
Lot 3A Substation Technical Schedules –Substations
132kV Dead-End and Suspension Insulators - Discs
Description
Minimum Requirements
Unit
Data
Manufacturer's name
Material
Rated maximum voltage (String)
Service voltage (String)
Individual Disc Data
kV
kV
to be indicated
porcelain, glass
disc, composite
polymer
145
132
Disc diameter (minimum)
Spacing
Flashover values:
Power frequency voltage
Power frequency
6.0 Dry
7.0 Wet
Lightning impulse:
8.0 Positive
9.0 Negative
Radio interference voltage (RIV):
10.0 Test voltage to ground
11.0 Max. RIV at 1000 kHz
Nominal creepage distance
Dry arcing distance
Weight:
Accessories:
12.0 Clevis
13.0 Tongue fittings
ANSI class
Applicable Standard(s)
mm
mm
254
146
kV rms
132
kV
kV
95
55
kV
kV
125
130
kV
micro V
mm
mm
kg
10
50
432
203.2
to be indicated
to be indicated
Data offered by
Bidder
52.6
IEC 60016,
IEC 60305,
IEC 60433,
IEC 60076,
IEC 60289
Page | 51
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 20:
Lot 3A Substation Technical Schedules –Substations
132kV Post-Type Insulators
Description
Minimum Requirements
Unit
Data
Manufacturer's name
Material
Installation
Rated maximum voltage
Rated service voltage
Lightning impulse withstand voltage (at altitude less
kV
kV
kV peak
to be indicated
porcelain or
polymer ,
composite
polymer
outdoor
145
132
650
kV
275
micro V
mm/kV
500
31
kg
kgm
kg
800
400
to be specified
to be specified
Data offered by
Bidder
than 1000 M)
Power frequency 1 min. withstand voltage (at
altitude less than 1000 M)
Maximum RIV at 1000 kHz
Nominal creepage distance
Mechanical values:
6.0 Cantilever
7.0 Tensional strength
Weight:
Accessories:
8.0 Connectors
9.0 Joints
10.0 Clamps
Applicable Standard(s)
IEC 60016,
IEC 60168,
IEC 60865,
IEC 60273
DIN 48 013
Page | 52
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 21:
Lot 3A Substation Technical Schedules –Substations
33/0.4kV Auxiliary Transformer
Minimum Requirements
Description
Unit
Manufacturer
Data
to be specified
Type
3-phase, oilimmersed
Installation
indoor
Maximum Opering Voltage
kV
36 / 0.430
kV
33
kV
0.4
Rated power
kVA
100
Rated frequency
Hz
50
8.0 Primary side (high voltage)
A
2
9.0 Secondary side (low voltage)
A
5
Rated service voltage:
6.0 Primary side (high voltage)
7.0 Secondary side (low voltage)
Rated current:
Vector group
Dyn11
Impedance voltage
%
Type of cooling
4
ONAN
Off-load tap changer regulation
± 2 x 2.5%
Losses:
10.0 No-load losses
W
to be specified
11.0 Load losses
W
to be specified
Rated power frequency withstand voltage
kV
70
Rated lightning impulse withstand voltage
kV peak
170
Page | 53
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Sound power level
Unit
Data
dB (A)
68
Painting
Admiralty Grey
shade No. 632 as
per BS 381C
Dimensions:
12.0 Length
mm
to be specified
13.0 Width
mm
to be specified
14.0 Height
mm
to be specified
15.0 Distance between the wheel's centres
mm
to be specified
Total weight
kg
to be specified
Oil weight
kg
to be specified
Applicable standard(s)
IEC 60076
Page | 54
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 22: Low Voltage AC Distribution Panel for Auxiliary Services
Minimum Requirements
Description
Unit
Data offered by
Bidder
Data
General
Manufacturer's name
to be specified
Type
metal clad, indoor, air insulated
Installation
indoor
Rated Voltage
V
400/230
Rated frequency
Hz
50
A
to be specified
Busbar
Rated currents
Material
copper
Short-circuit current (1 s.)
kA
10
Number of 3-phase outgoings
to be specified
Number of 1-phase outgoings
to be specified
Protection
IP 4X
Equipment
16.0 Main 3-phase 4-poles moulded case
circuit breakerfor incoming feeder
17.0 3 current transformer
to be specified
18.0 3-phaseactive energy meter
to be specified
19.0 1 AC current meter
to be specified
20.0 1 current switch, 3 positions
to be specified
21.0 1 AC volt meter
to be specified
22.0 1 rotary voltage switch, 7 positions
to be specified
to be specified
Page | 55
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data offered by
Bidder
Data
to be specified
23.0 3-phase 4-pole moulded case circuit
breaker for outgoing feeders
24.0 1-phase
2-pole
moulded
case
circuitbreaker for outgoing feeders
25.0 1 outlet socket 220 V, 50 Hz, 10 A
to be specified
to be specified
Dimensions
26.0 length
mm
to be specified
27.0 height
mm
to be specified
28.0 depth
mm
to be specified
kg
to be specified
Weight
Applicable standard(s)
IEC 60364
IEC 60439
VDE 0100
Page | 56
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 23:
Lot 3A Substation Technical Schedules –Substations
Battery Bank 110 V DC, 300 Ah
Description
Minimum Requirements
Unit
Data
Manufacturer
Type
Model
Installation
Electrolyte
Container lid
Positive electrodes
Connector technique
Number of cells
Nominal voltage
Nominal capacity at 10 hour discharge rate
Float voltage per cell
Float charging current
Boost charging voltage per cell
Boost charging current
Battery voltage at end of duty cycle
Short circuit current
Internal resistance
Life expectancy
Cycling capacity
Weights and dimensions:
6.0 total weight of battery (incl. electrolyte)
7.0 weight per cell (incl. electrolyte)
8.0 width x depth x height per cell
Applicable standard(s)
V DC
Ah
V
A
V
A
V
A

years
cycles
kg
kg
mm
Data offered by
Bidder
to be specified
sealed OPzV, leadacid, tubular plate,
electrolyte in gel
form
to be specified
indoor, vertically on
racks
sulphuric acid, fixed
as gel
styrene acrylonitrile
(SAN) plastic
tubular plate, lead
calcium alloy
bolted connectors,
completely insulated
to be specified
110
300
to be specified
to be specified
to be specified
to be specified
to be specified
to be specified
to be specified
≥ 20
> 1,200
to be specified
to be specified
to be specified
IEC 60896
IEC 61056
Page | 57
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 24:
Lot 3A Substation Technical Schedules –Substations
Battery Charger
Description
Manufacturer
Type
Minimum Requirements
Unit
Data
2
Model
Design
Characteristics
Circuit configuration
Installation
Protection class
AC supply:
29.0 Rated service voltage
30.0 Frequency
31.0 Rated current
DC output:
32.0 Rated service voltage
33.0 Voltage setting range
34.0 Float charging voltage
35.0 Boost charging voltage
36.0 Regulation error of output voltage:
- at load variation 0-100%
- at frequency variations 50 Hz
- at input voltage variation
37.0 Output voltage regulation with current
limiting range
38.0 Regulation characteristic
39.0 Ripple content
40.0 Permissible humidity
41.0 Radio interference
to be specified
full capacity redundant
to be specified
fully electronic standard design
I/U characteristic
with high temperature stability
3-phase full wave
bridge circuit
indoor, in metal-clad
cubicles with front
door; all equipment
accessible from the
front side
IP41
V
Hz
A
400/230
50
to be specified
V
%
V
V
110
±5
125 (at 2.23 V/cell)
2.4 per cell
%
%
%
±1
±5
± 10
±2% within voltage
range of 80-100%
I/U as per DIN
41773 or equivalent
< 10 (pp) without
battery
acc. to IEC
"A" according to EN
%
Data offered by
Bidder
Page | 58
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Description
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Unit
Data
55011
2.3 as per VDE
0160
natural circulation
to be specified
to be specified
42.0 Derating factor (thyristors)
43.0 Cooling
44.0 Fuse switch disconnector (charger output)
45.0 Control unit with integrated mains filter,
phase failure supervision, soft start facility,
pulse blocking, cut-in delay
Monitoring devices:
46.0 Detailed fault alarm including collective
fault alarm and additional visual signalling at
front door
47.0 Three-phase
overvoltage
and
undervoltage supervision
48.0 Current-controlled
DC
undervoltage
supervision
49.0 DC
overvoltage
supervision
with
delayed/undelayed cut-off
50.0 Integrated supervision of thyristor fuses
51.0 Fuse supervision of auxiliary and control
circuits
52.0 Ripple monitoring
53.0 Time to recharge battery to 80% capacity
from fully discharged state
Measuring:
54.0 Volt meter and ammeter (charger output)
55.0 Battery tension, consumer tension
56.0 Charger current, consumer current
Disturbance reports:
57.0 Main failure, rectifier tensions too low
58.0 Battery circle too low, rectifier tension too
high, battery deeply unloaded
59.0 Battery circle disturbed, ground fault
plus/minus
60.0 Capacity test negative, short circuit
Efficiency
Weight
Width x depth x height
Applicable standard(s)
Data offered by
Bidder
to be specified
to be specified
to be specified
to be specified
to be specified
to be specified
hour
to be specified
10
to be specified
to be specified
to be specified
to be specified
to be specified
to be specified
%
kg
mm
to be specified
80
to be specified
to be specified
IEC 60146
IEC 60364
Page | 59
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Description
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Unit
Data
Data offered by
Bidder
IEC 60439
IEC 60947
Page | 60
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 25:
Lot 3A Substation Technical Schedules –Substations
Protection Relays
Minimum Requirements
Description- Protection and indication system
LINE DIFFERENTIAL PROTECTION AND BACK
UP DISTANCE (87l/21)
Manufacturer
Type reference
Relay design (microprocessor based, numerical)
Auxialliary Voltage range (Vn= 110 V dc
Input frequency range (50Hz Nominal)
Differential protection requirements
Unit
-
Data offered by
Bidder
to be specified
Vdc
Hz
Phase segregated protection
Ratio and Vector correction for CTs
Adjustable
biased
differential
characteristics
Sensitivity
Data
Numerical
77-150
47.5-52.5
Yes
Yes
yes
protection
ms
<30
For phase faults
For earth faults
Operating time
Distance protection requirements
3 zone ph-ph&ph-E
Phase fault & Earth fault characteristic shapes
(Mho, Quad)
Operating time
SOTF
Power swing Blocking ( depending on relaying
point in the power system
Voltage transformer supervison
time delay for all zones
Zone enable/disable for all zones
Other requirements
Thermal overload, 49
Circuit breaker failure
50BF (dependent on
application)
Event recording function
Disturbance recording function
Fault locator function
Intergral operator interface for local interrogation
Programmable scheme logic
yes
yes
ms
<30
Yes
yes
yes
yes
yes
no
yes
yes
yes
yes
yes
yes
Page | 61
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
carry continuous current 1A
Make
6A max. for 0.2s
Break dc 50W resistive
25W inductive (L/R 40ms)
Self checking facility
Intergralintertrip send and receive, with external
input interface
Communications
Protection
Direct optical fibre 1300nm single mode
Control
Communication ports ( Front/rear etc)
Unit
Data
Data offered by
Bidder
yes
yes
yes
yes
yes
yes
yes
yes
(Note: Two Rear ports for NCC and RCC)
Physsical links (R485/Fibre optic)
Protocol supported
-
IEC 60870-5-101
IEC 61850
Type tests
yes
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
Mechanical Environment
Vibration
Shock and bump
Seismic
IEC 60255-21-1
IEC 60255-21-2
IEC 60255-21-3
Yes
Yes
yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Yes
Yes
Page | 62
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Unit
Impulse voltage
IEC 60255-5 test voltage 5kv
Data
Data offered by
Bidder
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements
Description- Protection and indication system
DISTANCE PROTECTION (21)
Manufacturer
Type reference
Relay design (microprocessor based, numerical)
Auxialliary Voltage range (Vn= 110 V dc
Input frequency range (50Hz Nominal)
Distance protection requirements
3 zone ph-ph&ph-E
Phase fault & Earth fault characteristic shapes
(Mho, Quad)
Operating time
SOTF
Power swing Blocking ( depending on relaying
point in the power system
Voltage transformer supervision
Time delay for all zones
Teleprotection modes PUR/POR/Block
DEF plain and Blocking modes
Z1 min and max operating time (mid Zone)
Zone enable/disable for all zones
Other requirements
Thermal overload, 49
Circuit breaker failure 50BF- (dependent on
Unit
Data
Data offered by
Bidder
to be specified
Vdc
Hz
Numerical
77-150
47.5-52.5
yes
yes
ms
<30
Yes
yes
yes
yes
yes
yes
yes
no
yes
Page | 63
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
application)
Event recording function
Disturbance recording function
Fault locator function
Integral operator interface for local interrogation
Programmable scheme logic
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
carry continuous current 1A
Make
6A max. for 0.2s
Break dc 50W resistive
25W inductive (L/R 40ms)
Self checking facility
Integral inter-trip send and receive, with external
input interface
Communications
Protection
Direct optical fibre 1300nm single mode
Control
Communication ports ( Front/rear etc)
Unit
Data
Data offered by
Bidder
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
(Note: Two Rear ports for NCC and RCC)
Physical links (R485/Fibre optic)
Protocol supported
-
IEC 60870-5-101
IEC 61850
Type tests
yes
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
Mechanical Environment
Vibration
Shock and bump
Seismic
IEC 60255-21-1
IEC 60255-21-2
IEC 60255-21-3
Yes
Yes
yes
Page | 64
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Unit
Data
Data offered by
Bidder
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements
Description- Protection and indication system
LOW IMPEDANCE BUSBAR PROTECTION
INCLUDING BREAK FAILURE PROTECTION
Manufacturer
Type reference
Relay design (microprocessor based, numerical)
Auxiliary Voltage range (Vn= 110 V dc
Input frequency range (50Hz Nominal)
State principle of operation i.e. low impedance
Unit
to be specified
Vdc
Hz
Integral check zone feature (state principle of
operation)
Distributed bay modules and central Unit (Y/N)
Maximum number of bays
-
Isolator replica
CT saturation detector and stabilisation
Integral CT Supervision
CT matching Functions
Phase segregated protection
Data
Data offered by
Bidder
Numerical
77-150
47.5-52.5
Yes
ms
Yes
yes
<30
ms
yes
yes
<30
Page | 65
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Unit
Data
Two stage breaker failure

Phase faults

Earth fault
Yes
Facility to initiate the scheme by auxialiary contacts
I,eBucholz operation
2 out 4 check of current detectors Independently
settable delay times for operation with and without
current
Input trip contact
Other requirements
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
carry continuous current 1A
Make
6A max. for 0.2s
Break dc 50W resistive
25W inductive (L/R 40ms)
Self checking facility
Integral inter-trip send and receive, with external
input interface
Communications
Protection
Direct optical fibre 1300nm single mode
Control
Communication ports ( Front/rear etc)
Yes
Data offered by
Bidder
Yes
Yes
yes
yes
yes
yes
yes
yes
yes
yes
(Note: Two Rear ports for NCC and RCC)
Physical links (R485/Fibre optic)
Protocol supported
-
IEC 60870-5-101
IEC 61850
Type tests
Atmospheric
yes
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2Relative Humidity
yes
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
Enclosure
yes
Page | 66
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Unit
Data
Data offered by
Bidder
IEC 60529 IP50
Mechanical Environment
Vibration
Shock and bump
Seismic
IEC 60255-21-1
IEC 60255-21-2
IEC 60255-21-3
Yes
Yes
yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements
Description- Protection and indication system
Multifunction Overcurrent & Earth fault
protection (50/51/50N/51N
Manufacturer
Type reference
Relay design (microprocessor based, numerical)
Auxialliary Voltage range (Vn= 110 V dc
Input frequency range (50Hz Nominal)
Number of phase CT inputs
Number of earth fault CT inputs
Standard, Very and Extreme inverse and definite
time characteristics curves conforming to
IEC60255
Number of inverse overcurrent functions per phase
Unit
Data
Data offered by
Bidder
to be specified
Vdc
Hz
Numerical
77-150
47.5-52.5
Yes
Page | 67
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Number of high set overcurrent functions per phase
Number of low set overcurrent functions per phase
Number of inverse earth fault functions
Number of high set earth fault functions
Number of low set earth fault functions
Number of group setting
Earth fault element suitable of high impedance
REF (with external resistor)
operating time at 5X setting when configured for
REF
Suitable for Blocked overcurrent busbar protection
scheme
Other requirements

Thermal overload, 49 (Y/N)

Directional O/C and E/F (Y/N)
Number of output relays

Rated for tripping

Rated for control and alarm
Integral metering functions
Opto-isolator inputs
Event recording function
Disturbance recording function
Intergral operator interface for local interrogation
Programmable scheme logic
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
carry continuous current 1A
Make
6A max. for 0.2s
Break dc 50W resistive
25W inductive (L/R 40ms)
Self checking facility
Intergralintertrip send and receive, with external
input interface
Communications
Protection
Direct optical fibre 1300nm single mode
Control
Communication ports ( Front/rear etc)
Unit
Data
Data offered by
Bidder
Yes
ms
30
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
(Note: Two Rear ports for NCC and RCC)
Page | 68
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Unit
Data
Data offered by
Bidder
Physical links (RS485/Fibre optic)
Protocol supported
-
IEC 60870-5-101
IEC 61850
Type tests
yes
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
Mechanical Environment
Vibration
Shock and bump
Seismic
IEC 60255-21-1
IEC 60255-21-2
IEC 60255-21-3
Yes
Yes
yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements
Data offered by
Page | 69
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Description- Protection and indication system
Lot 3A Substation Technical Schedules –Substations
Unit
Data
Bidder
Multifunction Directional Overcurrent & Earth
fault protection (50/51/50N/51N
Manufacturer
Type reference
Relay design (microprocessor based, numerical)
Auxialliary Voltage range (Vn= 110 V dc
Input frequency range (50Hz Nominal)
Number of phase CT inputs
Number of earth fault CT inputs
Three phase VT input
Method of determining zero sequence voltage

Broken delta VT input
(Y/N)

Derived mathematically (Y/N)
Standard, Very and Extreme inverse and definite
time characteristics curves conforming to
IEC60255
Number of inverse DOC functions per phase
Number of high set DOC functions per phase
Number of low set DOC functions per phase
Number of inverse DEF functions
Number of high set DEF functions
Number of low set DEF functions
Number of group setting
Other functions provided

Non directional O/C 50/51 (Y/N)

Non directional E/F 50N/51N (Y/N)

Thermal Overload 49
(Y/N)

Suitable for Blocked overcurrent busbar
protection scheme

Earth fault element suitable of high
impedance REF (with external resistor)
Number of output relays

Rated for tripping

Rated for control and alarm
Other requirements
Integral metering functions
Opto-isolator inputs
Event recording function
Disturbance recording function
Intergral operator interface for local interrogation
Programmable scheme logic
to be specified
Vdc
Hz
Numerical
77-150
47.5-52.5
Yes
Yes
yes
yes
yes
yes
yes
yes
Page | 70
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
carry continuous current 1A
Make
6A max. for 0.2s
Break dc 50W resistive
25W inductive (L/R 40ms)
Self checking facility
Intergralintertrip send and receive, with external
input interface
Communications
Protection
Direct optical fibre 1300nm single mode
Control
Communication ports ( Front/rear etc)
Unit
Data
Data offered by
Bidder
yes
yes
yes
yes
yes
yes
yes
yes
(Note: Two Rear ports for NCC and RCC)
Physical links (RS485/Fibre optic)
Protocol supported
-
IEC 60870-5-101
IEC 61850
Type tests
yes
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
Mechanical Environment
Vibration
Shock and bump
Seismic
IEC 60255-21-1
IEC 60255-21-2
IEC 60255-21-3
Yes
Yes
yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Yes
Yes
Page | 71
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Unit
Impulse voltage
IEC 60255-5 test voltage 5kv
Data
Data offered by
Bidder
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements
Description- Protection and indication system
TRANSFORMER DIFFERENTIAL PROTECTION
Manufacturer
Type reference
Relay design (microprocessor based, numerical)
Auxiliary Voltage range (Vn= 110 V dc
Input frequency range (50Hz Nominal)
Differential protection requirements
Phase segregated protection
Ratio and Vector correction for CTs
Adjustable
biased
differential
characteristics
Sensitivity
-
Unit
Data
Data offered by
Bidder
to be specified
Vdc
Hz
Numerical
77-150
47.5-52.5
Yes
Yes
yes
protection
ms
<30
For phase faults
For earth faults
Operating time
5th Harmonic restraint
Other requirements
yes
High set element
Magnetising current inrush restraint
Measurement and indication on MMI of phase HV
and LV differential and bias current
Separate function that performs overfluxing
yes
yes
yes
Yes
Page | 72
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
protection with trip and alarm functions
Overcurent and earth fault
Event recording function
Disturbance recording function
Latching output contact
Integral operator interface for local interrogation
Programmable scheme logic
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
carry continuous current 1A
Make
6A max. for 0.2s
Break dc 50W resistive
25W inductive (L/R 40ms)
Self checking facility
Integral inter-trip send and receive, with external
input interface
Communications
Protection
Direct optical fibre 1300nm single mode
Control
Communication ports ( Front/rear etc)
Unit
Data
Data offered by
Bidder
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
(Note: Two Rear ports for NCC and RCC)
Physical links (RS485/Fibre optic)
Protocol supported
-
IEC 60870-5-101
IEC 61850
Type tests
yes
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
Mechanical Environment
Vibration
Shock and bump
IEC 60255-21-1
IEC 60255-21-2
Yes
Page | 73
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Seismic
Unit
IEC 60255-21-3
Data
Yes
yes
Data offered by
Bidder
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Description- Protection and indication system
Yes
Yes
Yes
Yes
Yes
Minimum Requirements
Unit
Data
Data offered by
Bidder
TRANSFORMER RESTRICTED EARTH FAULT
PROTECTION
Manufacturer
Type reference
Relay design (microprocessor based, numerical)
Auxiliary Voltage range (Vn= 110 V dc
Input frequency range (50Hz Nominal)
Differential protection requirements
Phase segregated protection
Principal of operation – high impedance
Ratio correction for CTs
Stabilising resistor and voltage dependent resistor
included
Sensitivity
-
to be specified
Vdc
Hz
Numerical
77-150
47.5-52.5
Yes
yes
Yes
yes
ms
<25
For earth faults
Page | 74
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
-
Unit
Data
Data offered by
Bidder
Operating time at 5X
reject harmonics produced by CT saturation
Other requirements
Event recording function
Disturbance recording function
Latching output contact
Integral operator interface for local interrogation
Programmable scheme logic
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
carry continuous current 1A
Make
6A max. for 0.2s
Break dc 50W resistive
25W inductive (L/R 40ms)
Self checking facility
Intergralintertrip send and receive, with external
input interface
Communications
yes
Protection
Direct optical fibre 1300nm single mode
Control
Communication ports ( Front/rear etc)
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
yes
(Note: Two Rear ports for NCC and RCC)
Physical links (RS485/Fibre optic)
Protocol supported
-
IEC 60870-5-101
IEC 61850
Type tests
yes
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
Mechanical Environment
Vibration
IEC 60255-21-1
Page | 75
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Shock and bump
Seismic
Unit
IEC 60255-21-2
IEC 60255-21-3
Data
Yes
Yes
yes
Data offered by
Bidder
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements
Description- Protection and indication system
TRIP CIRCUIT SUPERVISION
Manufacturer
Type reference
Relay design(Electro-mech, static, numerical)
Auxialliary Voltage range (Vn= 110 V dc
Operating time
Supervision of the whole trip circuit with CB open
and closed
Relay operated indicator
Type tests
Atmospheric
Unit
Data
Data offered by
Bidder
to be specified
Vdc
ms
77-150
yes
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2Relative Humidity
yes
Page | 76
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Unit
Data
Data offered by
Bidder
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
Mechanical Environment
Vibration
Shock and bump
Seismic
IEC 60255-21-1
IEC 60255-21-2
IEC 60255-21-3
Yes
Yes
yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Description- Protection and indication system
Yes
Yes
Yes
Yes
Yes
Minimum Requirements
Unit
Data
Data offered by
Bidder
MULTI CONTACT TRIPPING RELAYS
Manufacturer
Type reference
Auxialliary Voltage range (Vn= 110 V dc
Is relay mechanically latched or self resetting
Method used to reset latched relay (Hand or
electrical0
Minimum voltage at which reliable operation occurs
to be specified
Vdc
77-150
Yes
Page | 77
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description- Protection and indication system
Unit
Data
carry continuous current 5A
Make
30A max. for 0.2s
Break dc 50W resistive
25W inductive (L/R 40ms)
Relay operated indicator type
Type tests
yes
yes
yes
Atmospheric
yes
Data offered by
Bidder
yes
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
Mechanical Environment
Vibration
Shock and bump
Seismic
IEC 60255-21-1
IEC 60255-21-2
IEC 60255-21-3
Yes
Yes
yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burs disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Page | 78
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 26: Telecommunication System
Minimum Requirements
Description
Unit
Applicable standards for insulation / EMC / ESD
tests:
6.0 Protection
IEC 60265-4, 5, -6 (22-1, -2, 3, -4) class III
IEC 6081-1, -2,
-3, -4
IEC 60834-1
IEC 60255-4, 5, -6, class II/III
IEC 60801-1, 2, -3, -4
IEC 60870-1, 2, -3, -4
7.0 Telecontrol
OLTE transceiver characteristics:
8.0 Optical wave length
9.0 Optical source
10.0 Optical source life span
nm
11.0 Optical fibre type
12.0 Optical connectors
13.0 Jitter performance:
14.0 Power supply
15.0 Capacity
Digital multiplexers:
16.0 spare
channel
capacity
after
commissioning on each transmission section
(both main and backup)
Optical fibre salient characteristics:
17.0 Number of fibres
18.0 Core diameter
V
Mbps
1550 or 1310
laser
better than 15
years
single mode
Type FC-PC
ITU-T recommendation
G.823
48 V DC
8
≥ 30%
m
19.0 Cladding design
m
20.0
21.0
22.0
23.0
m
Clad diameter
Core-clad concentricity
Coating diameter
Coating concentricity
Data
Data offered by
Bidder
m
48 minimum
8.3 or 9 with a
± 3% tolerance
either matched
or depressed
125.0 ± 2
less than 2%
250 ± 15
≥ 0.7
Page | 79
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
24.0 Attenuation:
1310 nm
1550 nm
25.0 Bending attenuation:
1310 nm (75 mm)
1550 nm (75 mm)
26.0 Temperature dependence
27.0 Cut-off wave length
Chromatic dispersion:
28.0 Zero dispersion at:
29.0 Zero dispersion slope (max.)
30.0 Zero dispersion at
31.0 Zero dispersion slope (max.)
32.0 Mode field diameter:
1300 nm
1550 nm
33.0 IL proof test level
34.0 Splice attenuation
35.0 Connector loss
Construction requirements:
36.0 Transmission parameters:
Bit error rate (path including terminals at n x 2
Mbit/s
Jitter performance n x 2 Mbit/s
Teleprotection interface (test voltages according to
IEC 60255-4):
37.0 Isolation (0.5 J, 1 min.)
38.0 Pulse 1.2/50 µs
Telephone system:
39.0 Number of subscriber lines
40.0 Number of trunk lines
41.0 Equipped
spare
capacity
after
commissioning
42.0 Capacity for additional lines
Unit
Data
dB/km
dB/km
≤ 0.40
≤ 0.22
dB
nm
≤ 0.05 (100
turns)
≤ 0.10 (100
turns)
≤ 0.05 (-20 to
+85°C)
≤ = 1250
nm
ps/nm²/km
nm
ps/nm²/km
1310 ± 12
0.092
1550 ± 15
0.085
mm
mm
g/m²
dB/splice
dB/connector
9.30 ± 0.50
10.50 ± 1.00
35 x 106
0.02
≤ 0.5
dB
dB/km
Data offered by
Bidder
< 1 x 10-10
acc. to G.823
kV/DC
kV
2
1
%
1
1
30
%
50 (min.)
Page | 80
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Table 27:
Lot 3A Substation Technical Schedules –Substations
Control and Monitoring System
Description
Panels:
6.0 Pre-wired
7.0 Floor-mounted
8.0 Steel sheet thickness
9.0 Protection class
10.0 Maximum height
11.0 Door material
Bay units:
12.0 Spare units for additional bays
13.0 Power supply from station battery
Central Processing Units (PCU):
14.0 Microprocessor bus architecture
15.0 Memory for system software
16.0 Application software in battery-buffered
RAM or EPROM / Flash-PROM
17.0 Automatic time synchronization at all
nodes of the network
18.0 Fault indication LEDs on modules and
alarm messages on monitors
19.0 Basic functions: logic, sequence control,
data processing, including code conversion,
text and alarm signal editing, and function
units for binary processes
20.0 Cycle times, selectable (for each control
module)
21.0 Programming language: Elements for
logic, control loops, arithmetic
22.0 Minimum number of I/0 channels per
computer (analogue in / digital in / digital
out)
23.0 Spare
Video display and control system:
24.0 Power supply from station batteries
25.0 Number of monitors for each control
Minimum Requirements
Unit
Data
mm
m
Pcs.
1 spare for
each type of
Bay unit
provided
V DC
bit
type
Data offered by
Bidder
yes
yes
≥2
IP 52
2.25
glass
yes
110
32/64
PROM
yes
yes
yes
yes
ms
10, 20, 40, 50,
100, 200, 250,
500, 1000,
2000s
yes
(see rel.
chapter)
%
25
V DC
Pcs.
110
3
Page | 81
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Description
system
26.0 Number of function keyboards:
liquid-proof keyboard
exchangeable extended keyboard
27.0 Hardcopy printer
28.0 Event and record printer
29.0 Bus data channels
30.0 Event list
31.0 Alarm list
32.0 Resolution:
within computer
between computers
33.0 External alarm outputs
34.0 Diagramme change speed
35.0 Diagramme updating:
event-driven
cyclic, adjustable
36.0 Transfer of manual command inputs
Communication links:
37.0 Data transmission rate
38.0 Data transmission mode as serial bus to
IEEE 802.3 and CSMA / CD (Ethernet type)
39.0 Conductor as duplex fibre optic cable
40.0 Data transmission rate
41.0 Number of buses per processing unit
42.0 Nodes per buses
43.0 Transmission range (with fibre optic cable)
Programming and services unit (personal computer
or programming unit):
44.0
45.0
46.0
47.0
48.0
49.0
Main processor type (or better)
Main memory
Hard disc
Floppy disc drive 3.5"
Monitor type
Interfaces
50.0 Operating system
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Unit
Data
Pcs.
Pcs.
Pcs.
Pcs.
Pcs.
events
alarms
1
1
1
2
1
min. 400
min. 100
ms
ms
Pcs.
sec.
1
5
6
5
sec.
sec.
sec.
1
3 to 10
1
Mbit/sec.
10
yes
Mbit/sec.
no.
Pcs.
m
Mbyte
Gbyte
Mbyte
Data offered by
Bidder
yes
10
2
max. 45
1000
notebook or
personal computer
Pentium 166xx
min. 512
min. 100
1.44
active LCD
serial and parallel
OS, MS-DOS or
UNIX, Windows, latest
Page | 82
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Description
51.0 Weight
52.0 Ambient temperature:
Operation
Storage
Transport
Electromagnetic interference tests:
53.0 Insulation test, voltage test, individual test:
Applicable standards
Test voltage AC
or DC (1 minute)
external circuits against internal circuits
external circuits against earth and against earth
other
internal circuits against earth
54.0 Impulse voltage test, type test:
Applicable standards
Test level
Test voltage
External circuits against internal circuits
External circuits against earth
HF interference test, type test:
55.0 Applicable standard
56.0 Test level
57.0 Test voltage (1 MHz attenuated, repeat
rate 400/sec.):
Common mode voltage
Differential voltage
Transient disturbance values / burst, type test
58.0 Applicable standard
59.0 Test voltage
60.0 Burst duration
61.0 Repetition time
Electromagnetic fields, type test
62.0 Applicable standards
Electromagnetic discharges, type test
63.0 Applicable standard
64.0 Test conditions
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Unit
Data
kg
version
< 10
°C
°C
°C
15 - 50
0 - 60
-30 - +60
kV/Hz
kV
IEC 60255-5,
IEC 60950
2/50
2.85
level
kV
µs
IEC 60255-5
III
5
pulse: 1.2/50
Data offered by
Bidder
IEC 60255-22-1
III
kV
kV
2.5
1.0
kV/ns
ms
ms
IEC 60801-2
4, 5/50
15
300
IEC 60801-3
IEC 60255-22-3
IEC 60801-2
front door
Page | 83
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Description
65.0 Sharpness
66.0 Test voltage
Electric meter
67.0 Basic current lb
68.0 Load capacity in % of lb:
Metering
Thermal
Short circuit
69.0
70.0
71.0
72.0
73.0
Rated voltage (Un)
Rated frequency
Accuracy class
No creep on voltage variation
Starting load max.
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Unit
Data
kV
closed, closed
panel (covered)
3
8
A
3x5
V
Hz
V
A
Data offered by
Bidder
400
500
peak value of
50 lmax and >25
lmax during 1 µs
3 x 230 / 400
50
0.2
0.8 ÷ 1.15 Un
0.05% lb
Page | 84
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 28: Under Ground Cable
Minimum Requirements
Description
Manufacturer
Location of manufacturing site
Manufacture quality certification
Circuit rating required
1.0 General description of cable
Number of cores
System voltage
Conductor size
Insulation type
Metal sheath type
Oversheath type
2.0 Insulation Cordination
Highest system Voltage (Um) (Insulation class)
Nominal Voltage between conductors
Rated frequency
Nominal Voltage between conductor and sheath (Uo)
Rated Withstand impulse Voltage( altitude < 1000 M)
Rated short duration power frequency withstand voltage
Unit
Data
MVA
to be specified
to be specified
ISO 9001
90
kV
mm2
Data offered by
Bidder
1
132
XLPE
Lead
HDPE
kV
kV
Hz
kV
kV
kV
145
132
50
76.2
650
275
(altitude < 1000 M)
3.0 Rating
1
maximum continuous direct- buried current rating
assuming
Ground temperature of 30o C, Max. Soil Thermal
resistivity of 2.7Km/W, Flat formation configuration and
special bonding of metal sheath
Guaranteed current rating Single Trench
Calculation Method
Maximum continuous in air current , assuming
Air Temperature (in shade) of 40oC, Flat formation
configuration spacing of 250mm, Thermally independent
of other circuits and special bonding of metal sheath
Calculation Method
maximum permissible core temperature for continuous
operation
Sort circuit capacity for 1 sec
To be specified
A
IEC
60840,60287
A
To be specified
oC
IEC 60840,
60287
90
kA
To be specified
Page | 85
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Permissible Max. sheath Temperature
Permissible Max. Conductor Temperature
Permissible emergency Overload
Applied on 100% continuous load
 Emergency current rating
 Max. Emergency temperature
 Allowable duration/ operation
 Allowable total duration/ operation
Max. average duration/average on total life of cable
Applied on 50% continuous load
 Emergency current rating
 Max. Emergency temperature
 Allowable duration/ operation
 Allowable total duration/ operation
Max. average duration/average on total life of cable
Applied on 100% continuous load
 Emergency current rating
 Max. Emergency temperature
 Allowable duration/ operation
 Allowable total duration/ operation
Max. average duration/average on total life of cable
4.0 Construction features
Conductor

Material

Nominal cross section

Shape and type of conductor

Overall diameter

Water blocking method

Semi conductor blinder tape
Conductor Screen

Material

Nominal Thickness

Minimum Thickness

Nominal overall diameter

Compound identification reference
Insulation

Material

Nominal Thickness
Unit
Data
Data offered by
Bidder
oC
oC
to be specified
A
oC
Hours
Hours
Hours
to be specified
A
oC
Hours
Hours
Hours
to be specified
A
oC
Hours
Hours
Hours
Aluminum
mm2
mm
tape/yarn
yes
Fully bonded
Semicon. XLPE
mm
mm
mm
yes
XLPE
mm
Page | 86
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit

Minimum Thickness

Nominal overall diameter

Max. Continuos operating temperature

Compound identification reference
Maximum stress at nominal voltage

At conductor screen

At insulator screen
Maximum stress at impulse voltage

At conductor screen

At insulator screen
Insulation screen

Material
mm
mm
oC

Nominal Thickness

Nominal overall diameter

Compound identification reference

Indelible ink marking on screen
XLPE manufacturing methods

Extrusion line type e,g CCv,MDCV,VCV

Single pass/triple exclusion

Curing method

Cooling method

Degassing period
Data
Data offered by
Bidder
90
yes
kV/mm
kV/mm
kV/mm
kV/mm
Fully bonded
Semicon. XLPE
mm
mm
yes
VCV
yes
dry
dry
days
Bedding for moisture absorption

Type of Material

Nominal Thickness

Mimimum thickness

Nominal overall diameter
Metallic screen

Type and Material

Nominal Thickness

Mimimum thickness

Nominal diameter over screen

Cross sectional area of he screen

Short time current density(1sec)
Bedding/Binder tape

Type and Material

Nominal Thickness
mm
mm
mm
Copper wire
mm
mm
mm
mm2
kA/mm2
Page | 87
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description


Unit
Data
Data offered by
Bidder
Mimimum thickness
Nominal overall diameter over bedding
mm
mm
mm
Metallic screen

Type and Material

Nominal Thickness

Mimimum thickness

Nominal diameter over screen

Cross sectional area of he screen
 Short time current density(1sec)
Protective anti corrosion external sheath covering

Bitumen undercoat

Type and material

Colour

Nominal thickness

Minimum thickness

Termite resistant

Type of anti termite protection

Thermal resistivity

Type of fire protection for closing section
Type of conductive outer layer
Weight of completed cable

Copper

Insulation

Lead alloy

Gross weight
5.0 losses
Maximum dielectric loss per meter/ phase when operating
at nominal voltage frequency and at maximum conductor
temperature
Maximum sheath loss per meter/ phase when operating
at nominal voltage frequency and at current stipulated in
item 3 with sheath bonded and earthed as recommended
(sectionalising Cross bonding)
Maximum conductor loss per meter/ phase when
operating at nominal voltage frequency and at current
stipulated in item 3
lead-alloy ½ C
mm
mm
mm
mm2
kA/mm2
HDPE
Black
mm
mm
Yes
Specify max. 6.0
Km/w
Graphite/or
semicon.
polymer
to be specified
Kg/m
Kg/m
Kg/m
Kg/m
W/m
to be specified
W/m
to be specified
W/m
to be specified
Page | 88
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Total loss of cable per metre/ phase of three phase circuit
35.0 Electrical values
Maximum dc resistance of conductor at 20o C
Maximum ac resistance of conductor at operating
temperature C
Equivalent reactance of three phase circuit
Electrostatic capacitance per conductor of cable at
nominal voltage and operating temperature
Max. charging current per conductor at nominal voltage
Charging capacity of three phase system (at Uo)
Max. dielectric loss factor of cable at nominal voltage and
frequency at a conductor temperature of;

20 oC

90 oC
Positive and negative impedance
Zero sequence impedance (as installed conditions)

Resistance

Reactance

Capacitance
Surge impedance
36.0 Bonding and earthing
Type of special bonding
Max. sheath potential of completed cable with conductor
at max. earth fault current of 31.5 kA with sheath bonded
and earthed as recommended
Max. sheath potential of completed cable with conductor
at rated current with sheath bonded and earthed as
recommended
8.0 Testing
Routine tests

As per IEC 60840

Additional tests specified in Ketraco spec.
Sample tests

5Uo for 1 hr ( as per Ketraco spec)
Type tests

Test regime

Location of test

date of test
Commissioning tests

AC voltage withstand
W/m
to be specified
µΩ/m
µΩ/m
to be specified
to be specified
µΩ/m
pF/m
to be specified
to be specified
mA/m
Var/m
to be specified
to be specified
to be specified
Ω/m
to be specified
to be specified
Ω/m
Ω/m
pF/m
Ω/m
to be specified
V/m
to be specified
V/m
to be specified
Data offered by
Bidder
yes
IEC 60840
yes
1.7Uo for 1 hour
< 10pC
Page | 89
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description


Partial discharge monitoring
Oversheath DC voltage test
Unit
Data
kV
12kV for 15
minutes
Data offered by
Bidder
Page | 90
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 29: 132 kV Isolators without Earthing Switches
Description
Manufacturer
Type
Installation
Rated maximum voltage
Rated service voltage
Rated lightning impulse (BIL)(at altitude less than 1000 M)
Power frequency withstand voltage (at altitude less than 1000 M)
Rated short-time current
Rated frequency
Number of poles
Rated current
Minimum creepage distance
Operation
Opening time
Closing time
Rated peak withstand current
Minimum clearance in air:
 Between poles
 To earth
 For isolating distance
Type of operating mechanism:
 For disconnector
Rated supply voltage for operating mechanism
Current required at rated supply voltage to operate isolator:
Hand operating facility
Locking arrangement in Off and On
Automatic isolation of control supplies when lock off
Rated power of operating coil
Rated Motor power
Facing of terminals and contacts
Shape of terminals of the main circuit
Number and type of auxiliary switches:

Tin plated for Isolator
 For the disconnector
Auxiliary contact rating
Wind load
Minimum Requirements
Unit
Data
sec.
sec.
kA
to be specified
to be specified
outdoor
145
132
650
275
31.5
50
3
1600
31
motorized
≤ 30
≤ 30
100
mm
mm
mm
1600
1300
to be specified
kV
kV
kV peak
kV rms
kA
Hz
A
mm/kV
motor
V DC
A
W
W
110
to be specified
yes
yes
yes
to be specified
to be specified
to be specified
to be specified
Yes
5 NO , 5 NC
A
Pa
(N/mm²)
> 10
to be specified
Mechanical terminals load:
Page | 91
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
 Straight load
 Cross load
Weight of complete disconnector:
 With earthing switch
 Without earthing switch
Approximate dimensions in open position
Approximate dimensions in close position
With all accessories for installation
Applicable Standard(s)
Unit
N
N
Data
500
170
kg
kg
to be specified
to be specified
mm
mm
to be specified
to be specified
to be specified
IEC 62271-102
Page | 92
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Table 30: 33 kV Isolators without Earthing Switches
Minimum Requirements
Description
Unit
Data
Manufacturer
to be specified
Type
to be specified
Installation
outdoor
Rated maximum voltage
kV
36
Rated service voltage
kV
33
Rated lightning impulse (BIL)(at altitude less than 1000 M)
kV peak
170
Power frequency withstand voltage (at altitude less than 1000 M)
kV rms
70
Rated short-time current
kA
25
Rated frequency
Hz
50
Number of poles
Rated current
3
A
Hand operating facility
800
yes
Locking arrangement in Off and On
yesyes
Automatic isolation of control supplies when lockoff
yesyes
Rated power of operating coil
W
Rated Motor power
W
Minimum creepage distance
mm/kV
Operation
31
motorized
Opening time
sec.
≤ 30
Page | 93
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Closing time
sec.
≤ 30
Rated peak withstand current
kA
100
mm
500
7.0 To earth
mm
435
8.0 For isolating distance
mm
to be specified
Minimum clearance in air:
6.0 Between poles
Type of operating mechanism:
Motorised
9.0 For disconnector
Rated supply voltage for operating mechanism
Current required at rated supply voltage to operate isolator:
V DC
110
A
to be specified
Facing of terminals and contacts
to be specified
Shape of terminals of the main circuit
to be specified
Number and type of auxiliary switches:
5 NO , 5 NC
10.0 For the disconnector
Auxiliary contact rating
A
> 10
Pa
(N/mm²)
to be specified
11.0 Straight load
N
500
12.0 Cross load
N
170
13.0 With earthing switch
kg
to be specified
14.0 Without earthing switch
kg
to be specified
Wind load
Mechanical terminals load:
Weight of complete disconnector:
Page | 94
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder
Republic of Kenya
Kenya Electricity Transmission Company
Lot 3A Substation Technical Schedules –Substations
Minimum Requirements
Description
Unit
Data
Approximate dimensions in open position
mm
to be specified
Approximate dimensions in close position
mm
to be specified
With all accessories for installation
to be specified
Applicable Standard(s)
IEC 62271-102
Page | 95
Kenya Power Transmission System Improvement Project PROJECT NO: PKE-FA0-004-5083020 | March 2012
Data offered by
Bidder