Issued Revised Approved Reviewed September 9, 1984 December 2008 G. Saini J. Fuller

Transcription

1 Specification Medium Voltage Metalclad Switchgear Medium Voltage Number: Issued Revised Approved Reviewed September 9, 1984 December 2008 G. Saini J. Fuller Rev. 2 SCOPE This specification covers general material and design requirements for a line up of Indoor and Outdoor Medium Voltage (5 KV to 15 KV) Metal Clad Switchgear supplied to Vale Inco. The latest specified Standards, Codes and Regulations shall apply to all other requirements not specifically mentioned. In case of conflict, Vale Inco will furnish a written interpretation. The attached Form No forms an integral part of this specification. 1. CODES, STANDARDS AND REGULATIONS For all references made in this specification to standards of acceptability, the latest issues, amendments and supplements apply, unless stated otherwise, References: CSA EEMAC IEEE CEC ANSI NEMA Canadian Standards Association Electrical and Electronic Manufacturers Association of Canada Institute of Electrical and Electronic Engineers Canadian Electrical Code American National Standards Institute National Electrical Manufacturers Association Page 1 of 13

2 2. DEFINITION For the purpose of this specification metal clad switchgear is considered as a metal structure containing circuit breakers and associated equipment installed in sheet steel enclosures. 3. DEVIATIONS FROM SPECIFICATION All deviations from requirements of this specification and enclosed data sheet and single line diagram(s) shall be clearly listed out in a List of Deviations Quotations for alternative components or equipment, in whole or in part for the unit specified, are permitted where it is considered that savings in capital, or operating costs, or any improvement in safety and reliability are obtained by deviating from this specification. Clearly identify alternatives in the quotation and where necessary, submit a separate alternative quotation. 4. SUBMITTALS 1. Completed Form No Weights and dimensions of each type of vertical section. 3. Bill of material for incoming feeder, tie feeder and each type of outgoing feeder. 5. DELIVERY AND SHIPPING 1. Ship the completed metal clad switchgear assemblies suitably protected for transportation and storage at site in compliance with Schedule C - Purchase Order Instructions or any other special instructions in P.O.. 2. Identify shipping split between vertical units as approved by Vale Inco. Loose supply material required to complete assembly shall be identified and enclosed within the shipping assembly for which it is required. 3. Provide all necessary hardware and wiring to field connect assemblies at shipping sections. Page 2 of 13

3 6. DESIGN AND CONSTRUCTION 6.1 Design and Build Design and build the integrated assembly to safely withstand the mechanical and thermal effects of interrupting, short time conduction and closing & latching of fault currents specified. 6.2 Assembly 1. Provide sturdy steel individual vertical sections of uniform height and unit width, each containing circuit breakers (or switches, if specified) complete with power bus work, insulators, ground bus, lugs, protection and ancillary equipment as specified in the Form No and as shown on the single line drawing(s). 2. Mount each cell assembly front and rear on full width steel channel bases, designed to withstand field skidding of each shipping section into place. Bolt sections together to form rigid free-standing structure having smooth, unbroken front face, designed for future extension from either end. 3. Provide bolt-on type removable plates with gaskets at power and control cable entry locations for each cell, top or bottom, as specified in the Form No Provide non-magnetic entry plates where power connections are by means of single conductor cables. 5. Provide ventilation louvers where required for dissipation of ionized gases or heat, and screens to prevent entry of rodents. 6.3 Compartments 1. Provide segregated sheet metal compartments for the following: - AC bus - High voltage connections - Breakers/switches - Low voltage control and relays - Low voltage wiring - Potential transformers - Surge protection Page 3 of 13

4 2. Limit opening between compartments to the size required to accommodate inter-compartmental control wiring and bus. Align wire ways between sections. 3. Secure doors mechanically with captive type self-aligning screws. Provide provision for padlocking on front of circuit breaker/switch compartments. 4. All removable covers secured with bolts should be provided with handles for easy manoeuvring when removing and reinstalling the covers. 5. Provide formed steel door on low voltage control and relay compartments. Mount meters, relays and control devices on door (relays and some or all control devices may be mounted on a separate control panel, if so specified). Pistol grip switches for breaker ON/OFF control shall be remote mounted in a control box if no control panel is being provided for in the project. 6. Provide fail-safe mechanically activated automatic grounded metal shutters in each circuit breaker compartment to prevent exposure of live bus work when circuit breaker carriage is withdrawn. 6.4 Termination of Power Cables 1. Provide cable support clamps for incoming and outgoing power cables. 2. Provide lugs to terminate power conductors to accommodate sizes as specified on Form No or Single Line Diagrams (if provided). 3. Provide adequate field accessible space to install stress cones. 4. Provide means to ground incoming and outgoing power cables. 6.5 Circuit Breakers 1. Provide horizontal draw-out type, three pole, single throw, electrically and mechanically trip free circuit breaker(s) rated as specified in Data Sheet Form No Provide electrically operated stored energy closing mechanism and stored energy tripping mechanism. 3. Ensure that anti-pumping feature and a spring charged indicator is included. Page 4 of 13

5 4. Incorporate a fail-safe mechanism to discharge the spring before the breaker can be withdrawn from its compartment. 5. Provide self-aligning primary and secondary disconnecting devices. 6. Provide a provision for manually charging the spring mechanism. 7. Provide three breaker positions within the breaker cubicle i.e. with the compartment door remaining closed. - Operating i.e. racked-in and fully engaged - Test i.e. racked-out with control circuits engaged - Disconnected i.e. racked-out and fully disengaged 6.6 Safety & Interlocks 1. Provide a fail-safe mechanical interlock to prevent racking in or out when breaker is closed and to prevent breaker closing unless fully engaged or in test position. 2. Provide an interference mechanism to prevent insertion of breaker of wrong size or rating. 3. Ensure that all necessary provisions are included to prevent forcing a breaker into a racked-in position. 4. Provide a mechanically activated position indicator and provision to padlock the breaker in disconnected position. 5. Provide a visible grounding mechanism that ensures that the breaker is effectively grounded during withdrawal. 6. Ensure that the breaker is interchangeable with other breakers of the same rating. 7. Separately fuse circuit breaker open and close control circuits and provide circuit monitoring of a fail-safe design on each circuit such that the breaker cannot be closed electrically or manually if the trip circuit is not healthy. Provide one (1) form "C" contact on each monitor circuit for Inco use. 8. Provide manual control operation of each breaker using pistol grip type control switches (mounted on a separate control box). 9. Provide position indicating lights; red for closed, green for open and white for spring charged position on breaker low voltage compartment. Page 5 of 13

6 10. Provide a mechanically activated, non-resettable operation counter on each breaker. 11. Provide a minimum of eight (8) field reversible auxiliary contacts for Inco use. 6.7 Vacuum Bottles 1. For vacuum interrupter type breakers provide vacuum bottle assemblies which are interchangeable and fully rated for fault level of incoming power system i.e. without using power fuses for short circuit interrupting or current limiting. 2. Provide means to visually inspect the operating condition of the vacuum interruption system without using tools or measuring devices. 3. Install the bottles in a framework, which protects them from exposure to mechanical and electro dynamic forces. 4. Provide pure, gas-free contact materials, designed to minimize current chopping and prevent contacts from welding together. 6.8 Phase Bus 1. Provide solidly mounted electrolytic copper phase buses, with silver plated joints completely encapsulated or wrapped with track-resistant insulating material. 2. Maintain phase consistency through each section. 3. Provide four adequately torqued bolts at each bolted connection. 4. Provide horizontal bus in a single continuous length between shipping sections. 5. Drill for future extension at each end. 6. Ensure that the bus hottest spot temperature rise is not greater then 65 0 C above an ambient temperature of 40 0 C. 7. Provide flame and track resistant bus supports made of nonhygroscopic material. 8. Provide barriers to prevent interphase arcing at breaker bus stub-in locations. Page 6 of 13

7 9. Provide all necessary hardware to field connect assemblies at shipping sections. 6.9 Ground Bus 1. Provide a continuous length of electrolytic copper ground bus not less than 1/4" x 2", secured along entire shipping section and designed for bolted cell to cell connections with not less than two bolts used at each end. Drill for future extension at each assembly end. Add vertical riser ground bus in multi cell modules. 2. Provide compression type cable connectors for each of the following: - copper ground cable, 2/0 AWG through 250 MCM at each end of assembly - ground wire for each power cable - ground wire for not less then two (2) control cables for each ground compartment 6.10 Surge Protection Provide three (3) distribution type lightning arresters and surge capacitors connected to each bus section Current and Potential Transformers 1. Provide cast epoxy type current transformers and potential transformers as shown on the single line drawing(s) and as specified on Form No Provide current and potential transformers capable of withstanding the mechanical and thermal stresses if subjected to the full load or maximum rated short circuit current of the switchgear. 3. Ensure that the current transformers are capable of driving combined burdens of relays, meters or devices as per single line drawings(s) up to 15 times nominal rating without saturation. 4. Mark all current transformer polarities and verify installation compliance with the schematic drawings. 5. Provide accuracy class and ratio as indicated on the single line drawing(s) and as specified on the Form No Page 7 of 13

8 Ensure that revenue metering type current and potential transformers are supplied when applicable. 6. Wire all current transformers secondary leads to relays and instruments through test blocks located at the bottom of the front door of each breaker cell. 7. For shipment, short circuit and ground all current transformer terminals at the outgoing current transformer terminal blocks. 8. Provide potential transformers with 120 V secondary voltage complete with current limiting primary and secondary fuses, housed in a draw-out type, metal clad compartment. Ground primary of the potential transformers when disconnected. - Wire the potential transformers secondary windings to devices through test blocks located at the bottom of the assembly as indicated in the Form No Protection and Instrumentation 1. Provide protective relays, auxiliary relays, control switches, transducers, indicating lights and ancillary equipment as shown on the single line drawing(s) and Form No On front mounted panel equipment provide dust proof, black matte finish, semi-flush mounted, rectangular shaped devices, with glass viewing windows. 3. Provide digital multifunction type (or other type, if specified), front panel semi-flush mounted protective relays in draw-out cases with automatic CT shorting contacts on relay withdrawal. 4. Provide analog voltmeters on incoming feeders featuring needle type pointers; removable dials, 1% accuracy, taut band suspension and zero set adjustment. 5. Provide a digital metering system as shown on the single line drawing(s) and Form No Provide potential and current circuit test blocks, ABB type FT-1 or equivalent semi-flush mounted, with potential and current circuits wired to the same test block for metering circuits. Page 8 of 13

9 7. Provide lock-out type hand reset auxiliary relays when required, having 0.2 amp operating coils, target, and 4-N.O. and 4-N.C. contacts, semiflush mounted on front doors. 8. Provide rotary operated, heavy duty phase selector switches with knurled knob handle and position indicator with standard contact arrangements, semi-flush mounted on incoming circuit breaker low voltage compartment doors. - Three position voltmeter switch 9. Provide low burden, extra long life LED type, miniature switchboard indicating lights, with caps and lamps removable from front. 10. Where specified, provide internally mounted transducer(s) of 4-20 ma output unless specified otherwise. 11. Provide loss of 120 VAC potential, fail-safe, type "C" alarm contact for Inco use, on all potential transformer secondary winding circuits. 12. Where required, provide regulated, protected and adequately sized power supplies for all devices requiring power other than switchgear control power Wiring & Terminals 1. Provide 600 volt insulated single conductor, stranded (seven strands minimum) copper, heat and flame retardant wiring rated 90 0 C. Extra flexible wires for door mounted items. Minimum No. 14 AWG wiring for 115 V AC and 125 V DC controls and minimum No. 12 AWG wiring for current transformers. 2. Provide wiring in continuous length, without splices between connection points, installed in channels or neatly tied and clamped to panel. 3. Colour code wiring as follows: volt AC - black volt DC - red 4. For control wiring provide modular snap-on construction terminal blocks, Weiland or Weidmuller make. Page 9 of 13

10 5. Provide 20% spare terminals in each compartment for Inco use. Mount terminal blocks for current transformers separate from control terminal blocks. 6. Mount terminal blocks for external connections in instrument compartment grouped, easily accessible, visible and positioned near the compartment's field control cable entry points. 7. Terminate all wiring on terminal blocks if not terminated on devices. No more than one (1) wire at any one terminal is acceptable, except where jumper wires are necessary. Use compression type spade connectors where wiring is terminated on hardware components (relays, meters, switches, etc.). Soldered connections are not permitted. Terminate all spare contacts on terminal blocks. 8. Identify all wires at both ends with sleeve type wire markers, with wire numbers as shown on the manufacturer's control schematic drawings, with current transformer polarity connections being clearly identified. 9. Provide all interconnecting wiring between cells for a complete switchgear assembly. Where breaks between shipping sections occur, provide suitable arrangements for continuation of the interconnecting wires to facilitate reconnection on the terminal blocks Nameplates 1. Mechanically fasten all nameplates to switchgear housing. 2. Identify the switchgear assembly as per CSA Standard C22.2 No. 31-M. 3. Provide laminated phenolic plastic identification nameplates of consistent size having engraved 3/8 inch high black lettering on white background. Identify each cell front and back with unit number specified in the requisition. 4. Provide a separate nameplate for each sub-assembly showing current rating, manufacturer's identification number and reference to wiring diagram as a minimum. 5. Provide warning signs on removable panels giving access to high voltage compartments having engraved 1 inch high white lettering on red background Outdoor Switchgear Page 10 of 13

11 When specified on the Form No, provide modular type weatherproof enclosure(s) suitably designed to house the indoor type switchgear. The enclosures shall meet the following minimum requirements. (For switchgear to be installed in a pre-fabricated control building the building requirements are covered in separate specifications) 1. Front, centre and rear full width skids with 6" clearance, from grade to underside of floor. 2. Insulated roof, sides and doors 3. Corrosion protection 4. Spray applied heavy rubberized sealant to the under surfaces of the structure 5. Spray applied anti-condensation material to the underside of the roof 6. Double flanged gasketted outside doors, each with opening stops and provision for padlocking 7. Four lifting eyes per shipping section 8. Removable, bolted, gasketted, bottom entry cable plates 9. Cell doors hinged on the same side, each with opening stops and provision for padlocking 10. Energy efficient fluorescent, 120 VAC industrial type internal lighting, switched at entry doors 11. Wallpack 70W HDS fixtures mounted externally complete with photocell. 12. Electric 120 VAC, thermostatically controlled baseboard heater, sized to keep minimum temperature well above required limits of installed equipment 13. Two (2) service U ground 120 VAC receptacles; one inside and one weather protected outside Page 11 of 13

12 14. One (1) 120/208 volt, 3-phase, 4-wire station service transformer supplied off the switchgear bus 15. One (1) 120/208 V, 3-phase, 4-wire station service panel board per Engineering No One (1) 125 V DC, 8 hour rated battery and charger with trouble and failure, type "C" alarm contacts for Inco use 17. One (1) 125 V DC breaker panel, as required, complete with main circuit breakers and two pole, bolt-on type, visible blade branch circuit breakers. Provide minimum of 4 spare breakers 6.16 Finish After metal work is completed and prior to installing any equipment or wiring, clean thoroughly the entire assembly to remove rust, scale, grease and any other foreign matter. Apply one coat of metal primer, chromate or approved equal on metal surfaces both inside and outside, followed by two coats of good quality enamel. For indoor service, finish the inside and outside of switchgear in ASA61 grey, unless specified otherwise in the Form For outdoor service, finish the outside of the switchgear with outdoor equipment green. Provide a sufficient quantity of touch-up paint to repair minor damage to the finish after installation Ancillary Equipment 1. Provide one (1) set of the following wrenches or tools per assembly: - Circuit breaker manual closing lever - Removable hand crank to operate breaker levering-in mechanism - Manual charging lever - Breaker transfer dolly 6.18 Testing 1. Subject all equipment to manufacturer routine shop tests required by the referenced standards and electric supply authority. Page 12 of 13

13 2. The offered assembly shall be tested for maximum allowed corona pulse magnitude at specified corona extinction test voltage as per standard CAN/CSA-C22.2 No. 31-M89. The results shall be within permissible limit and are to be included in the Test Certificates to be furnished. 3. Inco reserves the right to inspect materials and equipment and witness tests to determine compliance with this specification and release the equipment for shipment. 7.0 OPTIONAL REQUIREMENTS The following shall be provided, if specified in the RFQ/PO. 7.1 Maintenance setting switch: Switch for lower setting (field selectable) of instantaneous protection (element 50) for incoming feeders. This switch shall be provided with padlocking provision in the maintenance mode. The switch shall be hardwired to protection circuit. Setting change through software or over the data network is not acceptable for this application. 7.2 Arc resistant switchgear: Type of protection i.e. Type A, Type B or Type C shall be as indicated in project specific documents. The design shall meet all applicable EEMAC and IEEE standards. Type test certificates for offered switchgear or switchgear of similar design shall be furnished. 7.3 Arc terminator: Provision of arc terminator to create a 3 phase fault for quick tripping of incomer breaker in case of arcing fault. 7.4 Light sensing relay: Optical sensor and relay for instantaneous tripping of incomer breaker(s) in case of arcing fault. Make of relay to be approved by Vale Inco. 7.5 Remote racking of circuit breakers: 7.6 Breaker test station: Provide one circuit breaker test station per assembly in an EEMAC Type 1 general purpose enclosure, complete with all accessories necessary to enable testing of the breaker outside the assembly. Ensure that the test station extension cable is minimum twenty (20) feet long. END OF STANDARD Page 13 of 13