CAS 36 Ring Main Unit

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1 Power distribution networks Ring Main Unit Catalogue 2008

2 A new path for achieving your electrical installations A comprehensive offer The 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.

3 Contents 0 Presentation and characteristics Presentation 2 Applications 2 Selecting functions 2 Range description 2 Standards 2 Symbols 3 Technical characteristics 3 Dimensions and weights 3 Description A compact architecture 4 Enclosure 4 Control panel 5 Control mechanism 5 Switchgear 6 Options 6 Fuse compartment 6 Fuses Fuse dimensions 7 Fuse replacement 7 Fusarc CF fuses selection table for transformer protection 7 Installation and connection Network cable compartment 8 Connection of cables for the protection function Q 8 Installation 8 Selecting the type of connectors 8 Civil works 3I 9 2I + Q 9 2I + 2Q 10 Order form 11

4 Presentation and characteristics 0 DE55571 MT CAS-36 (SF6) Transformer LV Presentation 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. 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 meet the definition of a pressurized, sealed for life system in conformity with IEC recommendations. Applications 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 For other operating conditions, please consult us. Selecting functions The range offers the user a non-extensible of units involving 1, 2, 3 and 4 functional units. For extensible solutions, please consult us. PE55631 Range description There are different types of standard units, according to the number and type of functions (I) or (Q): b 3 I b 4 I b 2 I + Q b 2 I + 2 Q b 3 I + Q And specially designed for wind turbines: b 0 I + Q b 0 I T + Q b 0 I D B + Q b 0 I T D B + Q b 0 I + 1 I + Q b 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 meets the following international standards. Applicable standards are being updated (the new designation is in brackets). b IEC (IEC ) b IEC (IEC ) b IEC (IEC ) b IEC (IEC ) b IEC

5 DE55572 Ring Main Unit 36 kv Presentation and characteristics 0 Symbols PE55647 Network switch Function (I) Combined fuse switch, transformer feeder Function (Q) PE ITDB+1Q for wind farm applications Technical characteristics 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 Mechanical endurance 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 100 CO cycles (at rated current 630 A and 0.7 cos ϕ) 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 weights type 400/630 Width W (mm) Height H (mm) Depth D (mm) Approx. weight (kg) PE55632 H 3I I I+Q I+2Q I+Q I+Q IDB+Q IT+Q ITDB+Q I+I+Q * I+2I+Q * (*) The width is reduced when dismantling, enabling each function to be passed through the wind turbine door. W D 3

6 Description 0 PE Compact architecture 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 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. therefore does not require any maintenance of active parts. Disconnector switch breaking The electrical arc is extinguished by using the SF6 puffer action technique. 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 The diagram opposite shows a cross-section of a 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. Enclosure 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. 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. 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 meet definition for sealed pressure system, in conformity with IEC recommendations. The heavy duty, reliable and environment-proof design of the makes it extremely improbable that a fault should occur inside the switchgear. However, in order to ensure maximum safety of people, 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 (IEC ). 4

7 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

8 Description 0 PE55635 Switchgear The disconnector switches have the following architecture. 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 On each, 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. PE

9 Fuses PE55638 Fuse dimensions 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 , with a thermal striker. DE55573 Ø 45 Ø * Ø 6 Example (according to the selection table below) General case: for protection of a 630 kva transformer at 30 kv, we will choose Thermal striker 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 replacement In 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* (kv) (kv) (A) (ka) (A) (mω) (W) (mm) (kg) M / M M M M M M M M M (*) values of resistance are given ±10% at a temperature of 20 C Weight 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 :2000 Values valid for overloads y 20% and ambient temperature y 40 C Us (kv) Sr (kva) /6.3 12/16 12/25 12/25 12/ /40 12/40 12/50 12/63 12/80 (2) 12/100 (1) /6.3 12/16 12/20 12/25 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/ /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/ / /40 12/50 12/63 12/80 12/80 (1) /4 24/6.3 24/10 24/16 24/20 24/25 24/25 24/ / /40 24/50 24/63 24/63 (1) /4 24/6.3 24/10 24/16 24/20 24/20 24/25 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/ /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/ / /40 24/50 24/ /4 24/6,3 24/10 24/10 24/16 24/20 24/20 24/25 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/ /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/ / /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/ / /40 36/50 (1) (1) No valid overload (2) valid overloads < 10% 7

10 Installation and connection 0 PE55640 Network cable compartment 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 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. PE55639 Connection of cables for function Q 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 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. 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. Supplier Elastimold (protected) Pirelli (protected) Description of function type and the connection interface Selecting the type of connectors M 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) L-connector 400 A/15 ka M400LR mm 2 T connector M400TB/M440TB Max. 630 mm 2 L-connector PMA-4/400/36 T connector PMA-5/400/36AC mm 2 8

11 Civil works 0 3I PE55641 PE55642 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) Cross-section (mm 2 ) Position of outgoing cables (mm) Backside A Right side B Left side C I + Q A PE55643 PE55644 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 (mm 2 ) Position of outgoing cables (mm) Backside A Right side B Left side C

12 Civil works 0 2I + 2Q A PE55643 PE55646 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) Cross-section (mm 2 ) Position of outgoing cables (mm) Backside A Right side B Left side C

13 Compact switchboard Order form 0 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 Rated voltage Ur Short-circuit current Isc Quantity (kv) 36 (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 accessories Raising plinth h = 400 mm Operation and maintenance instructions French Spanish Portuguese English Options for Q function Auxiliary 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 Interlocking Between earthing switch and transformer door rating (A) 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

14 Personal notes 12

15

16 Schneider Electric Industries SAS 89, boulevard Franklin Roosevelt F Rueil-Malmaison (France) Tel.: +33 (0) AMTED304013EN 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 02/2008 ART Schneider Electric - All rights reserved

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