Power distribution networks
CAS 36
Ring Main Unit
Catalogue
2008
A new path for achieving
your electrical installations
A comprehensive offer
The CAS 36 range is part of a comprehensive offer of products
that are perfectly coordinated to meet all medium and low voltage
electrical distribution requirements. All of these products have
been designed to work together: electrical, mechanical and
communication compatibility.
The electrical installation is thus both optimised and has improved
performance:
b better service continuity,
b increased personnel and equipment safety,
b guaranteed upgradeability,
b efficient monitoring and control.
You therefore have all the advantages at hand in terms of
know-how and creativity for achieving optimised, safe,
upgradeable and compliant installations.
Tools for facilitating the design and installation
With Schneider Electric, you have a complete range of tools to
help you get to know and install the products whilst complying
with current standards and good working practices. These tools,
technical sheets and guides, design software, training courses,
etc. are regularly updated.
Schneider Electric is associating itself
with your know-how and your creativity
to produce optimised, safe, upgradeable
and compliant installations
For a real partnership with you
A universal solution doesn’t exist because each electrical
installation is specific. The variety of combinations on offer allows
you to truly customise the technical solutions.
You are able to express your creativity and put your know-how to
best advantage when designing, manufacturing and exploiting an
electrical installation.
Ring Main Unit 36 kV
CAS 36
Contents
0
Presentation and characteristics
Presentation
Applications
Selecting functions
Range description
Standards
Symbols
Technical characteristics
Dimensions and weights
2
2
2
2
2
3
3
3
Description
A compact architecture
Enclosure
Control panel
Control mechanism
Switchgear
Options
Fuse compartment
4
4
5
5
6
6
6
Fuses
Fuse dimensions
Fuse replacement
Fusarc CF fuses selection table for transformer protection
7
7
7
Installation and connection
Network cable compartment
Connection of cables for the protection function Q
Installation
Selecting the type of connectors
8
8
8
8
Civil works
CAS 36 3I
CAS 36 2I + Q
CAS 36 2I + 2Q
9
9
10
Order form
11
Presentation and characteristics
Ring Main Unit 36 kV
CAS 36
DE55571
Presentation
CAS 36 is a compact unit grouping together all of the MV functions for connection,
power supply and protection of transformers on an open ring or single feeder network.
Operating a distribution network sometimes requires additional switching points
to HV/MV substations to limit the impact of a fault on the network.
CAS-36
(SF6)
Transformer
MT
LV
CAS 36 offers a choice of solutions to produce 2, 3, 4 directional connections,
switching lines using disconnector switches.
All of the switchgear and busbars are integrated in the same stainless-steel SF6
gas-filled enclosure with 1 to 4 functional units:
b Function (I)
3-position network switch (400/630 A), (closed, open, earthed).
b Function (Q)
3-position combined fuse switch, transformer feeder (200 A), (closed, open, earthed).
PE55630
The performance levels achieved by CAS 36 meet the definition of a “pressurized,
sealed for life” system in conformity with IEC recommendations.
Applications
CAS 36 is the ideal solution to meet requirements for electrical distribution networks
with the following characteristics:
b Insulation level (rated voltage) y 36 kV.
b Network rated current y 400/630 A.
b Short time withstand current y 16/20 kA.
b Altitude y 1000 m.
b Ambient air temperature:
v less than or equal to +40°C
v less than or equal to +35°C on average over 24 h
v greater than or equal to –15°C.
Normal operating conditions, in conformity with IEC standard 60694.
For other operating conditions, please consult us.
Selecting functions
The range offers the user a non-extensible of CAS 36 units involving 1, 2, 3 and
4 functional units.
For extensible solutions, please consult us.
PE55631
Range description
There are different types of standard CAS 36 units, according to the number
and type of functions (I) or (Q):
b CAS 36 3 I
b CAS 36 4 I
b CAS 36 2 I + Q
b CAS 36 2 I + 2 Q
b CAS 36 3 I + Q
And specially designed for wind turbines:
b CAS 36 0 I + Q
b CAS 36 0 I T + Q
b CAS 36 0 I D B + Q
b CAS 36 0 I T D B + Q
b CAS 36 0 I + 1 I + Q
b CAS 36 0 I + 2 I + Q
DB = cable unit on the front face for two connectors or surge arresters,
T = earthing disconnector.
For other configurations, please contact us.
Standards
CAS 36 meets the following international standards.
Applicable standards are being updated (the new designation is in brackets).
b IEC 60298 (IEC 62271-200)
b IEC 60129 (IEC 62271-102)
b IEC 60420 (IEC 62271-105)
b IEC 60265 (IEC 60265-1)
b IEC 60694
2
0
Presentation and characteristics
Ring Main Unit 36 kV
CAS 36
0
PE55647
DE55572
Symbols
Network switch
Function (I)
Combined fuse switch,
transformer feeder
Function (Q)
CAS 36
CAS 36
CAS 36
Technical characteristics
PE55629
Rated voltage (kV)
Insulation level
Industrial frequency
Impulse wave
Network
Rated current (A) (1)
Breaking capacity (A) (1)
Load current
Earthing fault
No load cables
Short time withstand current (kA rms)
Making capacity of switches and earthing
disconnectors (kA peak)
Endurance
Electrical endurance
CAS 36 0ITDB+1Q for wind farm applications
36 kV
70 kV
170 kV
400 A/630 A
400 A/630 A
50 A
25 A
16 kA/20 kA
40 kA / 50 kA
Mechanical endurance
Internal arcing
Transformer feeder
Rated current (A)
Fuse switch
Breaking capacity in short-circuit (kA)
Closing capacity (maximum kA)
100 CO cycles
(at rated current 630 A and 0.7 cos ϕ)
1000 opening operations
(16 kA/1 s) / (20 kA/0.5 s)
200 A
(Limited by fuse)
(Limited by fuse)
(1) In conformity with IEC standard, these characteristics are valid for ambient temperatures
of between –15°C and +40°C (class –15°C).
For higher temperatures, please contact us.
Dimensions and weights
PE55632
CAS 36 type
400/630
CAS 36 3I
CAS 36 4I
CAS 36 2I+Q
CAS 36 2I+2Q
CAS 36 3I+Q
CAS 36 0I+Q
CAS 36 0IDB+Q
CAS 36 0IT+Q
CAS 36 0ITDB+Q
CAS 36 0I+I+Q *
CAS 36 0I+2I+Q *
H
Width W
(mm)
1050
1200
1050
1200
1200
600
600
600
600
920
1580
Height H
(mm)
1850
1850
2000
2000
2000
2000
2000
2000
2000
2000
2000
Depth D
(mm)
1005
1005
1030
1030
1030
1030
1265
1030
1265
1030
1030
Approx.
weight (kg)
450
500
500
600
600
380
390
380
390
430
470
(*) The width is reduced when dismantling CAS 36, enabling each function to be passed through
the wind turbine door.
W
D
3
Description
Ring Main Unit 36 kV
CAS 36
0
PE55633
Compact architecture
14
4
11
6
5
12
7
CAS 36 switchgear is made up of 1 to 4 compact, small sized functional units.
This one-piece unit with integral insulation comprises:
b A stainless steel metal enclosure, sealed for life, grouping together the active parts,
network switch disconnectors, earthing switches and transformer feeder fuse-switch
combination,
b One to four cable compartments with connection interfaces to the network
or to the transformer,
b A low voltage compartment,
b A fuse chamber compartment for combined fuse switches.
Performance levels obtained by the CAS 36 meet “pressurized sealed for life systems”
definitions in conformity with IEC recommendations.
The disconnector switch and the earthing disconnector provide the operator
with all of the operating guarantees he requires:
Sealing
The SF6 filled enclosure is at a relative pressure of 0.3 bar. It is sealed for life after
filling. The sealing is routinely checked in production, giving a device with an
expected lifespan of 30 years.
CAS 36 therefore does not require any maintenance of active parts.
Disconnector switch breaking
The electrical arc is extinguished by using the SF6 puffer action technique.
13
9
The diagram opposite shows a cross-section of a CAS 36 2I + Q unit
where can be seen the various compartments and functions:
b Function (I) in the lower part of the CAS,
b Function (Q) in the upper part of the CAS.
Each function (I) or (Q) is equipped with a moving contact and two fixed contacts,
one to close the switch and the other for earthing.
The intermediate position, between closed and earth is “open” position.
1
4
Enclosure
11
The strength of the galvanized steel used to support the kiosk components
makes it non-deformable and corrosion-resistant.
The enclosure is made of 2.5 mm stainless steel.
6
2
5
3
12
8
7
10
1 SF6 tank
2 Busbars
3 Disconnector switch
4 Fuses compartment
5 Control mechanism compartment
6 Control panel and mimic diagram
7 MV cable compartment
8 M16 disconnectable plug
9 Plug-in connector
10 Safety membrane
11 Pressure indicator
12 Voltage presence indication system
(VPIS)
13 LV compartment (optional)
14 Tripping coil
4
Tank
It is filled with SF6 gas at a relative pressure of 0.3 bar and sealed for life after filling.
The sealing is routinely checked in production and gives the device an expected
service life of 30 years. CAS 36 therefore requires no maintenance of active parts.
The tank groups together all of the active parts: the disconnector switch,
the earthing disconnector, and transformer feeder fuse-switch combination.
The performance levels achieved by CAS 36 meet definition for “sealed pressure
system”, in conformity with IEC recommendations.
The heavy duty, reliable and environment-proof design of the CAS 36 makes it
extremely improbable that a fault should occur inside the switchgear. However,
in order to ensure maximum safety of people, CAS 36 is manufactured to withstand
an internal arc supplied power at a rated short-circuit value of 16 kA for 1 second
or 20 kA for 0.5 seconds, without endangering the operator.
Accidental overpressure due to internal arcing is limited by the opening of a safety
valve in the lower part of the metal enclosure, without any event or projection towards
the front of the device. After type testing carried out for 16 kA/1 s or 20 kA/0.5 s,
the device satisfied the six criteria defined in appendix AA of IEC 60298
(IEC 62271-200).
Ring Main Unit 36 kV
CAS 36
Description
0
PE55634
Control panel
On the front face of each cubicle there is a mimic diagram showing the main circuit,
including position indicators of the main switches.
Control mechanism
Mechanical and electrical control mechanisms for each switch are grouped on the
front face under a control panel with a mimic diagram for the device status (closed,
open, earthed).
Network and transformer disconnector switches
Switching operations are carried out using a fast action mechanism, independent of
the operator.
For the fuse switch disconnector, the switching mechanism is armed in the same
movement before closing the contacts.
Once the closing operation has been completed by acting on the lever, it is essential
to put the lever back in the opposite position for the springs to be re-armed and
for the lever to be extracted.
Opening is triggered by a fault (of the fuse striker or by the action of the tripping coil)
or by a push button (never the lever).
Closing is carried out with the lever.
A lever with a anti-reflex device can be supplied as an option.
Earthing disconnector switches
A control rod allows the closing or opening of the earthing contacts.
Access to his rod is blocked by a cover which closes when the switch
or the transformer disconnector switch is open and remains locked if it is closed.
Locking devices
Padlocks can be used to lock access to:
b the switch operating rod,
b the earthing disconnector operating rod.
5
Ring Main Unit 36 kV
CAS 36
Description
0
Switchgear
PE55635
The disconnector switches have the following architecture.
CAS 36 is a compact unit including:
b A mobile 3-stable position mechanism (closed, open and earthed)
which moves horizontally. Its design precludes the simultaneous closing
of the network switch and the earthing network switch.
b The earthing disconnector in conformity with standards, has a short-circuit
making capacity.
b The disconnecting function is associated with the breaking function.
b Access to the cable compartments is interlockable with the earthing disconnector
and the switch.
b Switch status indication: placed directly on the mimic diagram, these give
the position of each disconnector switch.
PE55636
Options
b Auxiliary contacts (up to 2 NO + 2 NC) on each switch and earthing disconnector.
b Function (I) motorized (48 Vdc) for line function.
b Padlock on the switching rod for each switch.
b Locking of the function (Q) for earthing.
b Cable unit on the front face for two connectors or for installing surge arresters.
b Tripping coil (220 Vac or 48 Vdc).
b 400 mm raising plinth.
Fuse compartment
PE55637
On each CAS 36, the fuses are mounted in insulated resin fuse chambers.
The three fuse chambers — for each function (Q) — are placed in the SF6 gas tank,
and are perfectly sealed from the SF6 gas. When they are closed they are completely
isolated from the outside and are therefore not affected by pollution, even in the case
of flooding.
A membrane carries out an important role: activating the trip mechanism for the switch
when the fuse has blown or when it is overheating.
Access to the control panel (on the front face) is interlocked with the earthing switch.
6
Fuses
Ring Main Unit 36 kV
CAS 36
Fuse dimensions
PE55638
The fuse ratings intended to protect the transformer depend amongst other things
on the following factors:
b Operating voltage,
b Transformer power,
b Fuse heat dissipation,
b Fuse technology (manufacturer).
It is recommended to use the following type of fuse:
b Fusarc CF type: according to dimensional standards DIN 43.625, with a thermal
striker.
Example (according to the selection table below)
General case: for protection of a 630 kVA transformer at 30 kV, we will choose
Fusarc CF-36/31.5 rating 31.5 A fuses.
DE55573
Thermal striker
Ø*
Ø 45
For more information on Fusarc CF fuses, please consult the Schneider Electric
catalogue no. AC0479EN/FR.
For installation of other manufacturer’s fuses, please consult us.
Ø6
33
33
537
Reference
Fuse replacement
23
Rated
voltage
Operating
voltage
In the case of a fuse blowing, standard IEC and UTE recommend systematically
replacing all three fuses.
Rated
current
(kV)
(kV)
(A)
51311 010 M0
36
20/36
4
51006 549 M0
6.3
51006 550 M0
10
51006 551 M0
16
51006 552 M0
20
51006 553 M0
25
51006 554 M0
31.5
51006 555 M0
40
51006 556 M0
50
51006 557 M0
63
(*) values of resistance are given ±10% at a temperature of 20°C
Maximum
breaking
current I 1
(kA)
20
Minimum
breaking
current I 3
(A)
20
36
34
50
62
91
101
135
200
250
Resistance
when cold*
Dissipated
power
Diameter
Ø*
Weight
(mΩ)
2.109
750
380
252
197
133
103
70
47
35
(W)
51
39
50
98
120
133
171
207
198
240
(mm)
50.5
(kg)
1.9
55
76
3.1
5.4
86
6.5
Fusarc CF fuses selection table for transformers protection
Usc (S y 630 kVA) = 4% ; Usc (S > 630 kVA and y 1250 kVA) = 5% according to IEC 60076-5:2000
Values valid for overloads y 20% and ambient temperature y 40°C
Us (kV)
6
6.6
10
11
13.2
13.8
15
20
22
25
30
33
Sr (kVA)
25
50
75
100
125
160
200
250
315
400
12/6.3
12/16
12/25
12/25
12/31.5
12/40
12/40
12/50
12/63
12/80 (2) 12/100 (1) –
500
630
800
1000
1250
–
–
–
12/6.3
12/16
12/20
12/25
12/31.5
12/31.5
12/40
12/50
12/50
12/80
12/6.3
12/10
12/16
12/20
12/25
12/25
12/31.5
12/40
12/40
12/50
12/100 (2) –
–
–
–
12/63
12/80
12/100 (1) –
12/4
12/10
12/16
12/20
12/20
12/25
12/31.5
12/31.5
12/40
–
12/50
12/63
12/80
12/80 (1) –
24/4
24/6.3
24/10
24/16
24/20
24/25
24/25
24/31.5
–
24/31.5
24/40
24/50
24/63
24/63 (1) –
24/4
24/6.3
24/10
24/16
24/20
24/20
24/25
–
24/31.5
24/31.5
24/40
24/50
24/63
24/63 (1) –
24/4
24/6.3
24/10
24/16
24/16
24/20
–
24/25
24/25
24/31.5
24/40
24/40
24/50
24/63 (2) –
–
24/6.3
24/6,3
24/10
24/10
–
24/16
24/20
24/25
24/25
24/31.5
24/31.5
24/40
24/50
24/63
–
24/4
24/6,3
24/10
–
24/10
24/16
24/20
24/20
24/25
24/31.5
24/31.5
24/40
24/40
24/50 (2) 24/63 (1)
–
36/4
36/6.3
–
36/4
36/6.3
36/6.3
36/10
36/10
36/16
36/20
36/25
36/25
36/31.5
36/40
36/40
36/50 (1) 36/63 (1)
36/6.3
36/6.3
36/10
36/16
36/16
36/20
36/25
36/25
36/31.5
36/31.5
–
36/4
36/4
36/40
36/50 (1)
36/6.3
36/6.3
36/10
36/10
36/16
36/20
36/25
36/25
36/31.5
36/31.5
36/40
36/50 (1)
(1) No valid overload
(2) valid overloads < 10%
7
Ring Main Unit 36 kV
CAS 36
Installation and connection
0
Network cable compartment
PE55640
Standard device
b Connection bushings 3XM16 (interfaces between the inside and the outside
of the tank, which is filled with SF6 gas),
b Cable flanges,
b Connection of cable earths,
b Closing panel which optionally be equipped with a special panel (235 mm thickness)
for two cable connectors or one connector with surge arresters.
Optional
CAS 36 can be equipped with a 400 mm high raising plinth.
Connection between network cables and the connection bushings must be carried out
with “T” connectors that are bolted and insulated at 630 A.
Locks to stop access to the network connection compartment when the earthing
switch is open.
Connection of cables for function Q
PE55639
The connection of transformer cables and connection bushings situated at the top
of the switch must be carried out with “straight” or “L-shaped” connectors insulated
to 400 A. Fixings for mobile cables are supplied.
Installation
CAS 36 is held by 2 brackets with holes for fixing:
b On a flat base produced with guttering, hoppers or ducts,
b On concrete walls,
b On blocks,
b On metal sections,
b etc.
CAS 36 network cables can be passed through ducts, etc.
This addition simplifies civil engineering works and leads to a reduction in the depth
of cable ducts, or even eliminates their use completely if the cable radius of
curvature allows this. The raising plinth is fixed directly to the ground.
Selecting the type of connectors
Supplier
Elastimold
(protected)
Pirelli
(protected)
8
Description of function type
and the connection interface
L-connector 400 A/15 kA
T connector
L-connector
T connector
M16 630 A/20 kA
Line function (I):
reinforced (bolted)
–
M400TB/M440TB
–
PMA-5/400/36AC
400 A/15 kA
Protection function (Q):
plug-in (non bolted)
M400LR
–
PMA-4/400/36
–
Dry insulation
18/30 kV cable
(UNE standard)
35-185 mm2
Max. 630 mm2
25-240 mm2
Ring Main Unit 36 kV
CAS 36
Civil works
0
PE55642
PE55641
CAS 36 3I
A
B
C
Cross-section (mm2) Position of outgoing cables (mm)
Backside A
Right side B
50
320
320
70
350
350
95
380
380
120
400
400
150
425
425
185
460
460
240
500
500
Dimension A, B and C (100 mm minimum),
according to the following criteria: final position of the radius
of curvature, 15 times the total diameter
(*) dry insulator, cable 18/30 kV (UNE standard)
Left side C
570
600
630
650
675
710
750
CAS 36 2I + Q
PE55644
PE55643
A
B
Cable fixings can be placed
at different places.
C
Dimension A, B and C (100 mm minimum),
according to the following criteria: final position of the radius
of curvature, 15 times the total diameter
(*) dry insulator, cable 18/30 kV (UNE standard)
Cross-section (mm2) Position of outgoing cables (mm)
Backside A
Right side B
50
100
100
70
100
100
95
130
130
120
150
150
150
180
180
185
220
220
240
260
260
Left side C
100
110
120
125
130
140
155
9
Ring Main Unit 36 kV
CAS 36
Civil works
0
CAS 36 2I + 2Q
PE55646
PE55643
A
B
C
Dimension A, B and C (100 mm minimum),
according to the following criteria: final position of the radius
of curvature, 15 times the total diameter
(*) dry insulator, cable 18/30 kV (UNE standard)
10
Cross-section (mm2) Position of outgoing cables (mm)
Backside A
Right side B
50
100
100
70
100
110
95
130
120
120
150
125
150
180
130
185
220
140
240
260
155
Left side C
100
110
120
125
130
140
155
Compact switchboard
Only one of the boxes (ticked X or filled
by
the needed value) have to be considered between each
horizontal line.
Green box X corresponds to none priced functions.
Order form
CAS 36 range
0
Basic unit characteristics
Quantity
Rated voltage Ur
(kV)
36
(kA)
Short-circuit current Isc
16 kA - 1 s
20 kA - 1 s
Rated curent Ir
400 A
630 A
Frequency
50 Hz
60 Hz
30 kV
33 kV
time current of short-circuit
Basic unit configuration
2l+Q
Set of functions
2l+2Q
3l+Q
3l
4l
0l+Q
0IT+Q
0IDB+Q
0ITDB+Q
0I+1I+Q
0I+2I+Q
Network service voltage
< 25 kV
25 kV
Global option and accessories
h = 400 mm
Raising plinth
Operation and maintenance instructions
French
Spanish
Portuguese
English
110 Vdc (*)
220 Vac
Options for Q function
Auxiliary contacts (2 N/O + 2 N/C) on each switch
Shunt trip coil
For external tripping
48 Vdc
Set of 3 MV fuses Fusarc CF 36 kV
rating (A)
Interlocking
Between earthing switch and transformer door
Options for I function
Auxiliary contacts (2 N/O + 2 N/C) on each switch
(*) 110 Vdc for tripping coil is only available with 1 N/O + 1 N/C aux. contact on the Q function.
11
Personal notes
12
89, boulevard Franklin Roosevelt
F - 92500 Rueil-Malmaison (France)
Tel.: +33 (0)1 41 29 85 00
http://www.schneider-electric.com
As standards, specifications and designs change from time to time, please ask for confirmation
of the information given in this publication.
This document has been
printed on ecological paper
Publishing: Schneider Electric
Production: Graphème
Printing: Imprimerie du Pont de Claix
AMTED304013EN
02/2008
ART.97420 © 2008 Schneider Electric - All rights reserved
Schneider Electric Industries SAS