RMU Catalog Ring Main Unit Cas36

Power distribution networks

CAS 36Ring 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.

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.

Schneider Electric is associating itself with your know-how and your creativity to produce optimised, safe, upgradeable and compliant installations

Contents 0

Presentation and characteristicsPresentation 2Applications 2Selecting functions 2Range description 2Standards 2Symbols 3Technical characteristics 3Dimensions and weights 3

DescriptionA compact architecture 4Enclosure 4Control panel 5Control mechanism 5Switchgear 6Options 6Fuse compartment 6

FusesFuse dimensions 7Fuse replacement 7Fusarc CF fuses selection table for transformer protection 7

Installation and connectionNetwork cable compartment 8Connection of cables for the protection function Q 8Installation 8Selecting the type of connectors 8

Civil worksCAS 36 3I 9CAS 36 2I + Q 9CAS 36 2I + 2Q 10

Order form 11

Ring Main Unit 36 kV CAS 36

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Presentation and characteristics 0

PresentationCAS 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 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).

The performance levels achieved by CAS 36 meet the definition of a “pressurized, sealed for life” system in conformity with IEC recommendations.

ApplicationsCAS 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°Cv less than or equal to +35°C on average over 24 hv greater than or equal to –15°C.

Normal operating conditions, in conformity with IEC standard 60694. For other operating conditions, please consult us.

Selecting functionsThe 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.

Range descriptionThere are different types of standard CAS 36 units, according to the number and type of functions (I) or (Q):b CAS 36 3 Ib CAS 36 4 Ib CAS 36 2 I + Qb CAS 36 2 I + 2 Qb CAS 36 3 I + QAnd specially designed for wind turbines:b CAS 36 0 I + Qb CAS 36 0 I T + Qb CAS 36 0 I D B + Qb CAS 36 0 I T D B + Qb CAS 36 0 I + 1 I + Qb CAS 36 0 I + 2 I + QDB = cable unit on the front face for two connectors or surge arresters,T = earthing disconnector.For other configurations, please contact us.

StandardsCAS 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


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CAS-36(SF6)

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Symbols

Technical characteristicsRated voltage (kV) 36 kV

Insulation level

Industrial frequency 70 kV

Impulse wave 170 kV

Network

Rated current (A) (1) 400 A/630 A

Breaking capacity (A) (1)

Load current 400 A/630 A

Earthing fault 50 A

No load cables 25 A

Short time withstand current (kA rms) 16 kA/20 kA

Making capacity of switches and earthing disconnectors (kA peak)

40 kA / 50 kA

Endurance

Electrical endurance 100 CO cycles (at rated current 630 A and 0.7 cos ϕ)

Mechanical endurance 1000 opening operations

Internal arcing (16 kA/1 s) / (20 kA/0.5 s)

Transformer feeder

Rated current (A) 200 A

Fuse switch

Breaking capacity in short-circuit (kA) (Limited by fuse)

Closing capacity (maximum kA) (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 weightsCAS 36 type 400/630

Width W (mm)

Height H (mm)

Depth D (mm)

Approx. weight (kg)

CAS 36 3I 1050 1850 1005 450

CAS 36 4I 1200 1850 1005 500

CAS 36 2I+Q 1050 2000 1030 500

CAS 36 2I+2Q 1200 2000 1030 600

CAS 36 3I+Q 1200 2000 1030 600

CAS 36 0I+Q 600 2000 1030 380

CAS 36 0IDB+Q 600 2000 1265 390

CAS 36 0IT+Q 600 2000 1030 380

CAS 36 0ITDB+Q 600 2000 1265 390

CAS 36 0I+I+Q * 920 2000 1030 430

CAS 36 0I+2I+Q * 1580 2000 1030 470

(*) The width is reduced when dismantling CAS 36, enabling each function to be passed through the wind turbine door.

CAS 36

CAS 36 CAS 36

Combined fuse switch, transformer feeder

Network switch

Function (I)

Function (Q)

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CAS 36 0ITDB+1Q for wind farm applications

Presentation and characteristics 0 Ring Main Unit 36 kV CAS 36

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1 SF6 tank2 Busbars3 Disconnector switch4 Fuses compartment5 Control mechanism compartment6 Control panel and mimic diagram7 MV cable compartment8 M16 disconnectable plug9 Plug-in connector10 Safety membrane11 Pressure indicator12 Voltage presence indication system

(VPIS)13 LV compartment (optional)14 Tripping coil

Description 0

Compact architectureCAS 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:

SealingThe 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 breakingThe electrical arc is extinguished by using the SF6 puffer action technique.

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.

EnclosureThe 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.

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).

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Control panelOn the front face of each cubicle there is a mimic diagram showing the main circuit, including position indicators of the main switches.

Control mechanismMechanical 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 switchesSwitching 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 switchesA 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 devicesPadlocks can be used to lock access to:b the switch operating rod,b the earthing disconnector operating rod.


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Description 0

SwitchgearThe 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.

Optionsb 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 compartmentOn 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.


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Fuses

Fuse dimensionsThe 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.

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.

Fuse replacementIn the case of a fuse blowing, standard IEC and UTE recommend systematically replacing all three fuses.

Reference Rated voltage

Operating voltage

Rated current

Maximum breaking current I

1

Minimum breaking current I

3

Resistance when cold*

Dissipated power

Diameter Ø*

Weight

(kV) (kV) (A) (kA) (A) (mΩ) (W) (mm) (kg)

51311 010 M0 36 20/36 4 20 20 2.109 51 50.5 1.9

51006 549 M0 6.3 36 750 39

51006 550 M0 10 34 380 50

51006 551 M0 16 50 252 98

51006 552 M0 20 62 197 120

51006 553 M0 25 91 133 133 55 3.1

51006 554 M0 31.5 101 103 171 76 5.4

51006 555 M0 40 135 70 207

51006 556 M0 50 200 47 198 86 6.5

51006 557 M0 63 250 35 240

(*) values of resistance are given ±10% at a temperature of 20°C


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Thermal striker

Fusarc CF fuses selection table for transformers protectionUsc (S y 630 kVA) = 4% ; Usc (S > 630 kVA and y 1250 kVA) = 5% according to IEC 60076-5:2000Values valid for overloads y 20% and ambient temperature y 40°CUs (kV) Sr (kVA)

25 50 75 100 125 160 200 250 315 400 500 630 800 1000 12506 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) – – – –

6.6 12/6.3 12/16 12/20 12/25 12/31.5 12/31.5 12/40 12/50 12/50 12/80 12/100 (2) – – – –

10 12/6.3 12/10 12/16 12/20 12/25 12/25 12/31.5 12/40 12/40 12/50 12/63 12/80 12/100 (1) – –

11 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) – –

13.2 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) – –

13.8 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) – –

15 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) – –

20 – 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 –

22 – 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)

25 – 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)

30 – 36/4 36/6.3 36/6.3 36/6.3 36/10 36/16 36/16 36/20 36/25 36/25 36/31.5 36/31.5 36/40 36/50 (1)

33 – 36/4 36/4 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%

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Installation and connection 0

Network cable compartmentStandard deviceb 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 QThe 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.

InstallationCAS 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 Description of function type

and the connection interface M16 630 A/20 kA Line function (I): reinforced (bolted)

400 A/15 kA Protection function (Q): plug-in (non bolted)

Dry insulation 18/30 kV cable (UNE standard)

Elastimold (protected)

L-connector 400 A/15 kA – M400LR 35-185 mm2

T connector M400TB/M440TB – Max. 630 mm2

Pirelli (protected)

L-connector – PMA-4/400/36

T connector PMA-5/400/36AC – 25-240 mm2


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Civil works 0

CAS 36 3I

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Cross-section (mm2) Position of outgoing cables (mm)

Backside A Right side B Left side C

50 320 320 570

70 350 350 600

95 380 380 630

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)

120 400 400 650

150 425 425 675

185 460 460 710

240 500 500 750

CAS 36 2I + Q

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50 100 100 100

70 100 100 110

95 130 130 120


120 150 150 125

150 180 180 130

185 220 220 140

240 260 260 155


A

B

C

A

B

C

Cable fixings can be placed at different places.

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CAS 36 2I + 2Q

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50 100 100 100

70 100 110 110

95 130 120 120


120 150 125 125

150 180 130 130

185 220 140 140

240 260 155 155


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Order form 0 CAS 36 range

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.

Basic unit characteristics Quantity

Rated voltage Ur (kV)

Short-circuit current Isc (kA)

time current of short-circuit 16 kA - 1 s 20 kA - 1 s

Rated curent Ir 400 A 630 A

Frequency 50 Hz 60 Hz

Basic unit configuration Set of functions 2 l + Q

2 l + 2 Q

3 l + Q

3 l

4 l

0 l + Q

0 I T + Q

0 I D B + Q

0 I T D B + Q

0 I + 1 I + Q

0 I + 2 I + Q

Network service voltage

< 25 kV 25 kV 30 kV 33 kV

Global option and accessoriesRaising plinth h = 400 mm

Operation and maintenance instructions

French Spanish Portuguese English

Options for Q functionAuxiliary contacts (2 N/O + 2 N/C) on each switch Shunt trip coil

For external tripping 48 Vdc 110 Vdc (*) 220 Vac

Set of 3 MV fuses Fusarc CF 36 kV rating (A)

Interlocking

Between earthing switch and transformer door

Options for I functionAuxiliary 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.

Compact switchboard

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Personal notes

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As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication.

Publishing: Schneider Electric Production: Graphème Printing: Imprimerie du Pont de Claix

02/2008

89, boulevard Franklin RooseveltF - 92500 Rueil-Malmaison (France)Tel.: +33 (0)1 41 29 85 00

http://www.schneider-electric.com

Schneider Electric Industries SAS

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RMU Catalog Ring Main Unit Cas36

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