2 Standards for reference
IEC60129
Alternating current disconnectors
and earthing switches
IEC60265-1
High-voltage switches. Part 1 :
High-voltage switches for rated
voltages above 1 kV and less than
52 kV
IEC62271-1
High-voltage switchgear and
controlgear - Part 1: Common
specifications
ANSI/IEEE C37.63
IEEE Standard requirements for
overhead, pad-mounted, dry-vault,
and submersible automatic line
sectionalizers for AC systems
ANSI/IEEEC37.71
Three-phase, manually operated
subsurface load-interrupting switches
for alternating-current systems
GB3804
A.C. high voltage switches for rated
voltages from 3kV to 63kV
GB/T11022
Common specification for high
voltage switchgear and controlgear
standards
3 Basic switch configurations
Two-position Load Break Switch are available for all NXA_ and
NXB_ types
All NXB_ types are also available with an integrated earthing
switch for safe and reliable earthing of the downstream line.
This version is called a 3-position switch to differentiate from
the standard 2-position switch.
1 Two-position switch ｜ 2 Three-position switch ｜ 3 Two-position 3-way switch types NXBD_A_ ｜ 4 Three-position 3-way switch types NXBD_C_
1
2
3
4
SECTOS Pole Mounted SF6 Load Break Switch｜Standards for reference 05
4 Electrical performance data
Insulation level
NXA
NXB & NXBD
Rated voltage
kV
12
24
36
- to earth and between phases
kV
28
50
70
- across the isolating distance
kV
32
60
80
- to earth and between phases
kV
75
125
170
- across the isolating distance
kV
85
145
195
Rated normal current
A
630
630
630
Mainly active load breaking current
A
630
630
630/400
Number of breaking operations CO
n
400
400
50/400
Line-charging breaking current
A
50
50
40
Cable-charging breaking current
A
50
50
40
Earth fault breaking current
A
50
50
175
Power frequency withstand voltage, 50Hz
Lightning impulse withstand voltage
Current ratings
Cable charging breaking current
under earth fault conditions
A
28
28
80
No-load transformer breaking current
A
6.3
6.3
20
kA/S
20kA/4S
20kA/4S
31.5kA/3S
kA
50
50
31.5
50
50
31.5
Short-circuit ratings
Short-time withstand current, I
k
Peak withstand current
Short-circuit making current
kA
Number of making operations
- main switch 50 kA (CL E3)
n
5
5
- main switch 31,5 kA (CL E3),
n
10
10
- earthing switch
50 kA (CL E2)
n
3
3
- earthing switch
31,5 kA (CL E3)
n
5
5
mm
620
620
Creepage distance
5
960* /1440
1
-40 ℃ ...+60 ℃
Ambient air temperature limits
Mechanical endurance (number of close-open operations)
- main switch
- earthing switch*
2
Filling pressure (+ 20 ℃ )
n
5000
n
2000
bar (abs)
1.4-1.5
1.4-1.5
1.5-1.6
Alarm pressure (+ 20 ℃ )
- density switch
bar (abs)
1.2
- density gauge
bar (abs)
1.2
- low gas lock-out mechanism
bar (abs)
1.1
Weight
NXB (manual operated type)
kg
82
NXA (manual operated type)
kg
117
NXBD(manual operated type)
kg
Degree of protection of the mechanism box
“*1”, 960mm special for 24kV product.
“*2”, Not suitable for NXA type
06 Electrical performance data｜SECTOS Pole Mounted SF6 Load Break Switch
138
IP 67
5 Features
The high quality 3mm stainless steel are used for tank, which
is designed for its maximum robustness and minimum
welding line to minimize corrosion, and specifically to
guarantee the safety of the operation personnel even with
the internal arc faults at the maximum fault capacity of the
tank the Sectos can withstands an internal fault without
venting hot gases.
The independent spring operation mechanism adopt ABB
patent spiral spring, provides a guaranteed load break fault
make capability by ensuring the opening and closing speed
of the switch.
Standard SF6 gas density units with temperature
compensated are provided by Sectos (density switch is
standard for electrical operated type; density gauge is
standard for manual operated type), which ensure no
misguide to wrong operating or lock-out by reliable and
stable gas pressure measuring.
The Sectos is provided with light reflecting position indicator
which are directly connected to the switch operating shaft
providing clear and unambiguous switch position indication.
Indicator made of light reflecting material, which is easily
visible from ground level even at night in driving rain.
The NXB and NXBD type are available as 2-position(ON-OFF)
or 3-position(ON-OFF-EARTH) switch. When supplied as a
3-positions switch the unit has facility to earth the line on
one side of the switch. The earth position of the 3-positions
switch is manually operated only.
The combined and integrated sensors are optional for NXB
and NXBD type, which ensure system Safety (No effects of
short-circuited or interrupted signal circuits; No risk for
ferroresonance), Compact design (voltage and current can
be measured in one combi sensor ) and Wide dynamic range
(Current from rated continuous current to short-time
withstand current 20kA, voltage rating is applicable from 7.2
to 24kV networks).
The switch can be manually controlled or it can be provided
with an integrated motor drive device for both remote and/or
local electrical control. The motor drive device can easily be
retrofitted on site to manually operated units.
The control cabinet is fitted with an automatism option (equip
with advanced FTU type REC523) which makes the Sectos
an automatic sectionalizer function. It can be current-counter
scheme with current detection or can be voltage-time
scheme with voltage detection.
Advanced and Integrated Helium leakage detecting and filling
equipment are be adopted, which ensuring SF6 leakage of
each switch is less than 0.15% strictly per year.
SECTOS Pole Mounted SF6 Load Break Switch｜Features 07
6 Accessories
Single spring mechanism
A
Usually Sectos Load Break Switch is equipped with single
spring mechanism. This kind of spring mechanism is Suitable
for most applications. It's ABB's patent spiral spring, have
stable and reliable characteristics. When the operating shaft
of the switch is turned by manual or motor drive device, the
spring charges during the first part of the movement, releases
in the last part of the movement, and turns the switch
abruptly to new position.Therefor the switch operates for
opening and for closing with the speed, which is completely
independent from the operator or from the operating device.
Normally, the motor operated switch close or open between
1.5-2.5 seconds from the command signal initiation.
Standard locking device
NXBZ90
As an option for sectos, there is available a locking device,
which can lock switch at open or close position by hook
stick manual operated under the pole. As locking device
operates, an indication sign(Locked) becomes visible through
the position indicator window.
Low pressure lock out device
NXBZ4
As an option for sectos, there is available a blocking device,
which blocks the operation of the operating mechanism by
means of a mechanical latch, releases when the inside gas
pressure reduces to lock-out pressure. As the lock-out
mechanism operates, an indication sign(Gas Low) becomes
visible through the position indicator window.
Density gauge
NXAP3
For manual operated Sectos, Density gauge can be standard
accessory. Which indicat gas pressure inside tank.
The low pressure lock out device is installed in the factory,
the lock out device is equipped with an auxiliary contact,
which provide electrical lock out for electrical operated type
switch.
The low pressure lock out device is recommended to be
used where the outside temperature never falls below -10℃
and the altitude doesn't exceed 1000m above sea level.
The manual locking device is installed in the factory, and is
equipped with an auxiliary contact, which provide electrical
lock out for electrical operated type switch.
Low pressure locking device can be used together with
special manual locking device NXBZ90.B.
The density gauge is temperature compensated, variation of
the outside air pressure does not affect the indication of the
gauge. Therefore is actually indicate the effective pressure of
the SF6 gas inside of the tank.
Density switch
ELEGMDI/0
For electrical operated Sectos, Density switch is standard
accessory, Which indicate gas pressure state inside tank.
The alarm contact of the density switch is normally
closed(NC) and it opens if the gas pressure in the tank falls
below 1.2bar(absolute) at 20℃.
1 Single spring mechanism｜2 Low pressure lock out device｜3 Manual locking device｜4 Manual locking device｜5 Density gauge｜6 Density switch
1
2
3
4
5
6
08 Accessories｜SECTOS Pole Mounted SF6 Load Break Switch
7 Electrical and remote control
7.1 Electrical control
The Sectos can be electrical operated locally, which Motor device and Electrical control cabinet are needed.
Motor drive device
UEMC40K8-24VDC
Motor drive device is mounted inside Mechanism box of side
of switch which mounted on the pole. It's can be assembled
before leave factory, also can be retrofitted on site to
manually operated units when needed by experienced people
easily.
UEMC-A2
Material:
Degree of protection:
Includes:
24VDC is normal for this UEMC40K8 Motor drive device,
12VDC, 48VDC, 60VDC, 110VDC, 125VDC, 220VDC are can
be ordered for other needs.
Space for:
Electrical control cabinet
UEMC-A2/A3
Electrical control cabinet is mounted under the pole, normally
2-3 meters above ground level on the pole.
UEMC-A3
Material:
Degree of protection：
Includes:
Electrical control cabinet UEMC-_ is including relevant control
circuit and components (heater, protection MCB, push
button, operating circuit, and so on), which ensure electrical
control locally, and have enough space for relevant
FTU(Feeder Terminal Unit) communication device.
Space for:
For 12VDC and 24VDC products, relevant Charger and
Batteries are equipped as backup power. Primary power
should be double-pole voltage transformer or from close-by
substation.
stainless steel AISI 304
IP 55
- mounting plate
- self-regulating heater 45 W,
- 110...250 V AC/DC
- relay panel
- wooden pole fixing element
- batteries
- charger
- 1 or 2 operating circuits
- remote control equipment
stainless steel AISI 304
IP 55
- mounting plate
- self-regulating heater 45 W,
- 110...250 V AC/DC
- relay panel
- wooden pole fixing element
- batteries
- charger
- 1 or 4 operating circuits
- remote control equipment
There are 2 standard types of this electrical control cabinet,
UEMC-A2 and UEMC-A3
1 Motor drive device UEMC40K8-24VDC ｜ 2 Electrical control cabinet UEMC- ｜ 3 UEMC-A2 ｜ 4 UEMC-A3
1
2
3
10 Electrical and remote control｜SECTOS Pole Mounted SF6 Load Break Switch
4
7.2 Remote control and automatic sectionalizer
7.2.1 Remote-function
When equip FTU(ABB type are REC523 and REC501) in
UEMC-_ electrical control cabinet, the type of whole control
cabinet then change to DTU-111 or 131(Type option see
point7.2.2). Its can realize remote-control, indicate,
measurement function, and automatic sectionalizer function
(only with REC523).
Functionality of REC501
Control
- one or two objects
- external heater
- integrated temperature compensated charger
Measurement
- temperature
- battery voltage
Condition monitoring
- SF6 pressure of primary equipment
- battery condition monitoring
- battery deep discharge protection
- operation counter for primary equipment
- internal self-supervision
Communication media
- serial cable
- modem
- conventional radio
- radio modem
- DLC
- cellular phones
- other RS232 adaptable devices
Communication protocols
- SPA
- LON with adapter
- ANSI X3.28
- RP 570
- IEC870-5-101
Pulse counter
- programmable pulse counter inputs for energy meters
SECTOS Pole Mounted SF6 Load Break Switch｜Electrical and remote control 11
Functionality of REC52
Control
- two to four objects
- external heater
- integrated temperature-compensated charger
Measurement and data logging
- phase currents and phase-to-phase voltages
- residual current and voltage
- active and reactive energy
- frequency
- temperature
- demand values of current and power
- power factor
- battery voltage
- harmonics
- disturbance and event recording
Condition monitoring
- control circuit supervision
- SF6 pressure of primary equipment
- battery deep discharge protection
- internal self-supervision of the unit
- circuit breaker / disconnector condition monitoring
- battery condition monitoring
- operation counter for primary equipment
Local Automation Functions
- Current Based Sectionalizer
- Voltage Based Sectionalizer
Communication media
- serial cable
- radio modem
- other RS232 adaptable devices
- modem
- DLC
- conventional radio
- cellular phones
Communication protocols
- SPA
- Modbus(RTU and ASCII)
- LON
- DNP 3.0
- IEC870-5-101
Protection(fault indication purpose)
- Directional/Non-directional over current
- Directional/Non-directional earth fault current
- Under voltage
- Inrush detector
- Phase discontinuity
- Auto recloser, 5 steps
IEC 1131 based tools used for configurating of
- I/Os - control functions
- other functional elements of a logic functions library
- measurement functions
- timers
12 Electrical and remote control｜SECTOS Pole Mounted SF6 Load Break Switch
7.2.2 DTU-111 and 131 type option
With REC501
DTU111 - □ □ □ □
1 = comm. protocol ANSI X3.28 HD
2 = comm. protocol RP 570
3 = comm. protocol IEC 870-5-101
A = no heater
B = heater resistor 45 W
1 = 1 pcs contactor logic with local control push buttons
2 = 2 pcs contactor logic with local control push buttons
A ≥20 Ah batteries
B ≥24 Ah long life batteries
C = no batteries
With REC523
DTU131 - □ □ □ □
1
2
3
4
5
=
=
=
=
=
reserved for future use
reserved for future use
comm. protocol IEC870-5-101
comm. protocol MODBUS ASCII & RTU format
comm. protocol DNP 3.0
B = 9 pcs sensors (Voltage dividers/Rogovski coils) are in
testing on NXB switches
C = 3pcs current transformers (1A/5A) e.g KOKU 072G4
600/1A CTs
D = 3pcs current transformers (1A/5A) and 3 pcs voltage
transformers (110V)
E = 4pcs current transformers (1A/5A) and 3 pcs voltage
transformers (230V)
F = 6pcs current transformers (1A/5A) and 3 pcs voltage
transformers (110V)
G = 3pcs current transformers (1A/5A) and 6 pcs voltage
transformers (110V)
H = 5pcs current transformers (1A/5A) and 4 pcs voltage
transformers and sensors
1 = Controls 1 pcs
push buttons
2 = Controls 2 pcs
push buttons
3 = Controls 3 pcs
push buttons
4 = Controls 4 pcs
push buttons
NXB..w. contactor logic and local control
NXB..w. contactor logic and local control
NXB..w. contactor logic and local control
NXB..w. contactor logic and local control
A ≥ 20 Ah batteries
B ≥ 24 Ah long life batteries
C = no batteries
SECTOS Pole Mounted SF6 Load Break Switch｜Electrical and remote control 13
7.2.3 Automatic Sectionalizer
Sectos Load. Break Switch can as Automatic Sectionalizer
with DTU-131xxxx control cabinet easily.Which also includes
all remote-function at the same time, don't need add any
hardware components.
As the 80-90% of Medium Voltage overhead line faults are
self clearing or transient by nature and last for a few cycles or
seconds. In coordination with the main circuit-breaker or
reclosers, The Sectos Load Break Switch is able to
distinguish between transitory and permanent faults occurring
in the section it is installed in. Only in case of a permanent
fault, it will isolate the line automatically.
From principle and application, the Sectos can as two kinds
of sectionalizer, one is Current Based sectionalizer(need
Current detection), the other is Voltage Based
sectionalizer(need Voltage detection).
Current Based Automatic sectionalizer
- Automatic sectionalizers are selfcontained, automatically
controlled circuit-opening devices.
Voltage Based Automatic sectionalizer
- Automatic sectionalizers are selfcontained, automatically
controlled circuit-opening devices.
- Lose voltage to Open
If Switch detect lost voltage two side of switch, Switch open
immediately.
- Add Voltage to Close(A-Time)
Either side add Voltage and last A-Time Switch close.
- A-Time open lockout
Either side add Voltage and lost it within A-Time,Switch
hold open and lockout.
- B-Time
Switch close and Start B-Time, If no lost voltage till B-Time
time out, Switch hold close.
- B-Time open Lockout
Switch close and Start B-Time, If lost voltage within B-Time,
Switch Open and Lockout ( Load side Fault )；
- Apply to Loop and emanative circuits.
- Automatic sectionalizers counts the fault current operations
of a upstream reclosing device.
- Automatic sectionalizers operates after a preselected
number of fault current operations.
- Automatic sectionalizers isolate the faulted section of a
distribution feeder after the feeder has been deenergized by
e.g. a recloser or reclosing CB.
1 Current Based Automatic sectionalizer ｜ 2 Voltage Based Automatic sectionalizer
1
2
Typical circuit
I＞
Recloser or CB
A-Time
Sectionalizer
(transient fault)
Recloser or CB
Recloser or CB
A-Time B-Time
Sectionalizer
Count Count
Count
14 Electrical and remote control｜SECTOS Pole Mounted SF6 Load Break Switch
Sectionalizer
(permanent fault)
Lock out
NXBD mounted at Double poles normally
2
1
3
4
1 Crossarm ｜ 2 Fixing clamp ｜3 Spacer plate ｜ 4 Surge arrester
Spacer plate
NXBZ59
The Spacer plates are required, if a 3-position switch(with
inner earthing switch)
8.2.2 Above the crossarm
Sectos(except NXBD) can be mounted below the Crossarm
easily.
The Spacer plates can be without, if a 2-position
switch(without inner earthing switch)
Description of Crossarm and Surge arrester can be found
above in point 8.2.1
The spacer plate is standard for NXBD type. See dimension
drawings at the point9.6
Fixing clamp
NXAM 4 or 5
NXB is easy to install above the crossarm using 2 pieces
fixing clamps---NXAM1 or NXAM2.
Surge arresters
MWK
To protect the Sectos against atmospheric overvoltages, it is
often necessary to install surge arresters on one or both sides
of the switch. Normally. It can be purchased locally according
to features of local power network. Also silicon rubber
insulated surge arresters of ABB, type MWK can be used,
complete information please go to website http: ABB.com.cn,
ABB Hochspannungstechnik AG, Switzerland or ABB High
Voltage Switchgear Co., LTD, BeiJing, China.
NXA is easy to install above the crossarm using 2 pieces
fixing clamps---NXAM4 or NXAM5.
See dimension drawings at the point9.7
NXAM1 is use for 80...100 x 80...100 crossarm. NXAM2 is
use for 120...160 x 120...160 crossarm
SECTOS Pole Mounted SF6 Load Break Switch｜ Main construction and mounting 17
9 Dimension drawings(unit:mm)
9.1 NXB Load Break Switch
9.2 NXBD Load Break Switch
SECTOS Pole Mounted SF6 Load Break Switch｜ Dimension drawings(unit:mm) 19
9.5 Fixing clamp
NXAM 1/NXAM 2
9.6 Spacer plate
NXBZ59
9.7 Fixing clamp
NXAM 4/NXAM 5
SECTOS Pole Mounted SF6 Load Break Switch｜ Dimension drawings(unit:mm) 21
10 Ordering type code
10.2 Type code Sectos NXA
10.1 Type code Sectos NXB and NXBD
The Pole Mounted Load Break Switch type
NXB
Pole mounted load Break Switch
3-way Pole mounted Load Break Switch
Single phase Pole mounted Load Break Switch
NXB
NXBD
NXBS
Rated voltage
12kV IEC
24kV IEC
24 C
The Pole Mounted Load Break Switch type
NXA
Pole mounted load break switch
NXA
Rated voltage 24kVlEC (*Creepage dIstance up to 960mm)
36 kVIEC (*Creepage dIstance up to 1440mm)
12
24
Type of insulators
Standard Silicone rubber insulators with 620mm creepage distance
Silicone rubber insulators with 960mm creepage distance
Silicone rubber insulators with Combi sensors and voltage sensors
Silicone rubber insulators with 6 CVD sensors and 3-phase CTs
Series 400 for underground cable bushings according to IEC
36 C
C
D
CS
CK
E
Without earting switch
Earting switch on one side when NXB
Earting switches on both sides/disconnectors when NXBD
Motor operating device
Only manual operating = BLANK
Gas measuring accessories in operaing mechanism box
Manual operated type with NXAP3 gas density gauge, with temp.
compensated, for temp.-40℃ ...+60℃
Motor or remote operated type with ELEGMD1/0 gas density
switch, with temp. compensated, for temp.-40℃...+60℃
Mechanical Low pressure lock-out device possible -10℃...+40℃
without temp. compensated
Motor and tripping coil voltage is 24VDC
Other voltages, 12VDC, 48VDC, 60VDC, 110VDC, 125VDC, 220VDC can
be ordered for other needs
A control cable is always needed with motor operating device
The alternatives are 8m, 12m, 16,xxM (max 25 m) xx to be specified
Medium control cabinet with relevant control circuit and
components, spare space ready for radio and ABB FTU
Big control cabinet with relevant control circuit and components,
spare space ready for bigger size communication device and
Control cabinet with relevant circuit and components, equip with FTU REC523
Control cabinet with relevant circuit and components, equip with FTU REC501
C
E
Rated current 630 A
630
Without earting switch
A
Motor operating device
Only manual operating = BLANK
630
A
C
C
M
-
Gas measuring accessories in operaing mechanism box
Manual operated type with NXAP3 gas density gauge, with
temp. compensated, for temp.-40℃ ...+60℃
Motor or remote operated type with ELEGMDI/0 gas density
switch, with temp. compensated, for temp.-40℃...+60℃
Mechanical Low pressure lock-out device possible -10℃ ...+40℃
without temp. compensated
M
-
3
3
3
4
Motor and tripping coil voltage
Other voltages, 12VDC, 48VDC, 60VDC, 110VDC, 125VDC, 220VDC can be
odered for other needs
3
4
630 A M 3 / 24VDC / 8M / UEMC-A2
24
36
Type of insulators
Silicone rubber insulators
Series 400 for underground cable bushings according to IEC
Rated Current 630 A
22 Ordering type code｜SECTOS Pole Mounted SF6 Load Break Switch
630 A M 3 / 24VDC / 8M / UEMC-A2
A control cable is always needed with motor operating device
The altematives are 8m, 12m, 16, xxM (max 25 m) xx to be specified
24VDC
8M
24VDC
Medium control cabinet with relevant control circuit and
components, spare space ready for radio and ABB FTU
Big control cabinet with relevant control circuit and components,
spare space ready for bigger size communication device and
Control cabinet with relevant circuit and components, equip with FTU REC523
Control cabinet with relevant circuit and components, equip with FTU REC501
8M
UEMC-A2
UEMC-A3
DTU131-xxxx
DTU111-xxxx
UEMC-A2
UEMC-A3
DTU131-xxxx
DTU111-xxxx
SECTOS Pole Mounted SF6 Load Break Switch｜Ordering type code 23
10.3 CT,VTand Sensor
10.3.1 CT and VT
CT and VT are option items when order Sectos
Ring type Current Transformer KOKU072G4 are standard
type of Sectos, For some special application,Applies to the
fault indicator SPEF 3A2C, Current Transformer type
KOKU072G3(same size with KOKU072G4) can be used. The
ratio of it is 400/0.1A, the CT of each phase are connected to
the shielded downlead cable KOHZ11 in the branching box
SPEC6, which also includes an over voltage protection.
Installed around the bushings of Sectos
-Type:
-Ratio:
-Burden/Class
KOKU 072 G4
400/1A,600/1A
3VA/5P10
VT(Voltage Transformer) should be equipped as power or
voltage measuring
TDO 6 type can be provided, also local purchaseing
according local requirement is available.
Outdoor voltage transformers TDO 6
- Highest voltage for equipment
- Power frequency test voltage, 1 min
- Lightning impulse test voltage
- Max. rated burden, classes
[VA/cl]
[kV] 12,17,5,24,25
[kV]
28,38,50
[kV]
75,95,125
50/0.2-100/0.5- burden,
0.5VA/5P20
10.3.2 Sensors
Combi, voltage and CVD Sensor are a new solution for
measuring currents and voltages for protection and monitoring
of Medium Voltage power systems. In the combi sensors, both
the current and voltage sensors are integrated in the same
compact cast resin part.
24 Ordering type code｜SECTOS Pole Mounted SF6 Load Break Switch
1VXA000040-en, 201108
Contact us
ABB Xiamen Electrical Controlgear Co.,Ltd.
No.559 Weili Road,Xiamen Fujian,361009,P,R,China
TEL: +86 592 6303 000
FAX: +86 592 6303 002
www.abb.com.cn
Power and productivity
for a better world™