Issued Revised Approved Reviewed October 31, 1984 October 22, 2002 J. Ross J. Fuller

Transcription

1 Number: Rev. 8 Portable Mine Power Centres Issued Revised Approved Reviewed October 31, 1984 October 22, 2002 J. Ross J. Fuller SCOPE This specification covers general material and design requirements for Portable Mine Power Centres supplied to Inco. The latest Standards, Codes and Regulations apply to all other requirements not specifically mentioned. In case of conflict, Inco will furnish a written interpretation. The attached Data Sheet Form No forms an integral part of this specification. Material and Equipment shall be of Canadian manufacture except where specified otherwise, or where Canadian made material is not available. All equipment forming part of the unit and the unit as a whole shall meet the requirements of section of the Ontario Electrical Safety Code. The structural and electrical design of the Portable Mine Power Centre shall be approved by a registered professional engineer licensed in the province of Ontario. 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 CAN/CSA-M EEMAC IEEE OESC ANSI NEMA OSHA Canadian Standards Association Use of Electricity in Mines Electrical and Electronic Manufacturers Association of Canada Institute of Electrical and Electronic Engineers Ontario Electrical Safety Code American National Standards Institute National Electrical Manufacturers Association Occupational Health and Safety Act and Regulations for Mines and Mining Plants Page 1 of 13

2 NETA National Electrical Testing Organization 2. DEFINITION For the purpose of this specification, a Portable Mine Power Centre is considered as a skid-mounted, metal-enclosed power source having the following components: 1. Three pole high voltage load interrupter switch with power fuses. 2. Dry type power transformer. 3. Secondary power distribution centre consisting of circuit breakers. All equipment is enclosed in a common metal enclosure mounted on a full size skid plate consisting of metal segregated compartments housing each of the above components. 3. DEVIATIONS FROM SPECIFICATION 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 Include with quotation a bill of material with model and catalogue numbers of all electrical components and a rough layout of the unit components showing approximate dimensions. Ensure that the supply of engineering data such as drawings, operating instructions, etc., is in compliance with the Inco Standard Equipment Purchases No accompanying this specification, include the following at the time of quotation: - completed Inco Data Sheet Form No list of deviations from this specification Page 2 of 13

3 The final documentation shall include an Operations and Maintenance Manual. The drawings provided shall include a general arrangement, layout drawing c/w bill of material, single line diagram, schematic diagram, and wiring diagram. The engineering design briefs shall also be provided. 5. DELIVERY AND SHIPPING 5.1 Ship the completed Portable Mine Power Centre adequately protected to withstand loading, shipment and outside storage at Inco site. 5.2 Clearly identify as follows: -Address -Inco Purchase Order No. -Inco Requisition No. -Inco Job No. - Name and phone number of contact person at plant 6. DESIGN AND CONSTRUCTION 6.1 Design and Build Design and build the Portable Mine Power Centre for rugged underground mining operation. Supply all material new and free of defects. 6.2 Enclosure Design and build the assembly so that it is capable of skidding in all four directions, capable of withstanding skid support at any two points, and braced to permit suspending the assembly in a vertical direction, for hoisting in the shaft. Provide the enclosure steel of sufficient gauge to offer adequate mechanical protection for the contents while in transport or operation. Provide lifting lugs and towing points at each end. Provide separate sheet steel cubicles for main load interrupter, transformer and distribution panel. The transformer enclosure shall be EEMAC 2 type enclosure all other equipment enclosures shall be EEMAC 12, unless otherwise specified. Provide bottom drain holes in each compartment. Provide bolt-on type removable gasketted plates at power and control cable entry locations. Provide two (2) separate entrance plates for high voltage cables to allow feedthrough to other equipment Page 3 of 13

4 6.3 Dimensions Design the equipment enclosure and component layout such as to minimize the size of overall package. Maximum dimensions are as shown on the data sheet. Ensure no electrical or operating equipment protrudes beyond the general enclosure. Provide all handles, plugs, lights, meters, etc., flush-mounted or recessed and protected from mechanical injury. Mount all equipment so that the wiring terminals are easily accessible. 6.4 Doors Provide formed, welded, rigid construction access doors, equipped with hinges and stainless steel hinge pins, plated captive fastenings and a provision for padlocking. Prevent access to the high voltage switch compartment when switch is in the on position. Prevent operation of the switch when the high voltage switch compartment door is open. Prevent access to the transformer compartment by bolting. 6.5 Termination of Power Cables 1. Provide cable support clamps for incoming and outgoing power cables. 2. Provide lugs to terminate incoming power conductors, two (2) per phase. 3. Provide adequate field accessible space to install slip-on field fabricated stress cones. 6.6 Buses 1. Phase Buses Phase buswork (if required) shall be solidly mounted tin plated copper power buses, spaced to provide air clearance between phases and between phase and ground. Provide flame and track resistant bus supports made of non-hygroscopic material. Provide all wiring connections to buswork, etc., with grade five 0.5 inch bolts, lock washers and nuts. Self-tapping screws, stove bolts, iron washers and similar are not permitted. Bus bracing to be 1.6 times the maximum symmetrical fault current available Page 4 of 13

5 2. Ground Bus Provide a continuous 1/4" x 2" copper ground bus extending through the full length of the enclosure. Provide an entrance plate for the connection of an external #4/0 ground wire to the internal ground bus. 6.7 Load Interrupter Switch 1. Provide non-draw-out type, three pole, group operated, continuously rated, air type load break interrupter switch with deionizing arc suppressor on each pole, operated and actuated through a quick make, quick break, non-defeatable mechanism. The switch shall be an S&C Indoor Distribution 600A Alduti-Ruptor Switch with chain coupled operator handle, sized for the voltage and current requirements. Arrange the switch such that when in the off position each phase blade can be clearly seen when viewed through the viewing window. Install interrupters such that when in the off position, each phase blade is de-energized. The switch shall be installed with proper clearances to maintain the switch s inherent electrical ratings and to facilitate fuse handling. These clearances include those between the switch and the metal enclosure and between the switch and buswork and/or cable connections and terminations. Wire mesh screen barriers shall be installed to allow the safe replacement of power fuses and inadvertent contact with live equipment. 2. Provide each interrupter switch with an externally mounted, permanently installed (non-removable) operating and spring charging handle to permit easy manual operations. The handle shall be preferably located so that a person operating the mechanism is not located in front of the transformer compartment. Provide operating handle of self-latching type with provision for padlocking in the off position, with visual indication Page 5 of 13

6 6.8 Power Fuses 1. Provide power fuses and holders mounted within the switch compartment, located on the load side of the switch. S&C SM-5S type fuse holders shall be provided c/w SM-5 fuse elements sized as per the attached data sheet No Provide blown fuse indicator to allow positive visual check of fuse condition without removing holder from the mounting. 6.9 Transformer 1. Provide a dry type power transformer. Build the transformer to CSA Standard C9-M. Supply the transformer compartment with louvres to provide adequate ventilation. The transformer assembly shall be constructed and braced to allow for hoisting the mine power assembly on its end (i.e. 90 degrees to the horizontal). 2. Voltage Ratios Provide voltage ratios and taps as defined in the Data Sheet Form No Insulation Provide Class 220 deg.c insulation with 80 deg.c temperature rise. Class 220 deg.c insulation with 80 deg.c rise means the transformer is rated at 80 deg.c rise but is provided with insulation suitable for continuous operation at 150 deg.c rise with 33% increase in output capacity without affecting normal life expectancy. The transformer coils shall be vacuum impregnated with epoxy resin type insulation and oven cured. The windings shall be vacuum impregnated a second time Page 6 of 13

7 4. Core 5. Coils Provide highest quality, non-ageing, grain oriented silicon steel laminations, securely held by structural steel clamps without throughbolts. Epoxy seal completed core. Fabricate coils from electrolytic copper. Braze current carrying joints or splices. Brace all coil leads. Provide HV and LV winding connections as defined in the Data Sheet Form No Equip primary windings with provisions for changing taps, fully rated KVA, off-load, two 2 1/2% above and two 2 1/2% below nominal primary voltage. Arrange the coils so as to ensure uniform cooling and easy accessibility to the transformer taps which shall be mounted at the front. Equip the low voltage star windings with the neutral point brought out to a fully insulated neutral terminal and connect to neutral grounding resistor. 6. Winding Temperature Indicator Provide a semi-flush mounted, dial type temperature gauge fitted with a manual reset maximum temperature follower. Provide alarm and trip contacts, each set at manufacturer's recommended set points. Wire alarm contact to terminal blocks for Inco use. Wire trip contact to trip the main circuit breaker. 7. Surge-Lightning Protection Provide surge and lightning protection as specified on the Data Sheet Form No complete with interconnections to the respective transformer bushing terminals. Run a separate ground from the surge protection to the transformer ground bus Page 7 of 13

8 6.10 Grounding Resistor Construct the neutral grounding resistor from corrosion resistant materials, with welded terminals to ensure operation under adverse conditions. Provide resistor continuously rated at 15 Amps and approx. 23 Ohms at 347 Volts. Mount the resistor in a convenient location in the transformer compartment. Provide fully rated, insulated conductor between the transformer neutral bushing and resistor with white colour for identification. For the resistor ground connection use green insulated, or uninsulated conductor V Distribution Panelboard Provide panelboard with adequate main bus capacity. A main secondary breaker shall be provided. Provide moulded case visible blade type, main and branch feeder circuit breakers having ratings and characteristics as specified on Data Sheet Form No The moulded case circuit breakers shall be Cutler-Hammer Series C type. Ensure that the breakers provide fully coordinated protection. Equip the breakers with the following minimum features: - field interchangeable and adjustable thermal-magnetic trip unit - shunt trip - padlocking facility 6.12 Metering and Relaying 1. Potential Transformers Provide volts potential transformer with primary nonrenewable fuses and one secondary leg grounded, adequately sized for metering Page 8 of 13

9 2. Control Transformer Provide volts, single phase, 60 Hz control transformer with one leg of the secondary winding fused and the other solidly grounded. Provide adequate VA capacity for monitoring and control of substation. 3. Voltmeter and Voltmeter Switch Provide a voltmeter with a heavy duty three (3) position phase selector switch to monitor transformer secondary voltage. 4. Current Transformers Provide current transformers of an adequate accuracy for the required relaying and metering. Mark polarities and verify installation compliance with the schematic drawings. Zero sequence current transformer windows shall be individually sized for maximum sized feeder cabling based on breaker frame size. 5. Ammeter and Ammeter Selector Switch Provide an ammeter with a heavy duty four (4) position (including "off") phase selector switch, with make before break contacts, to monitor the transformer total load current. 6. Protection and Control Provide protection and control as specified on Data Sheet Form No Provide a means for testing all ground fault detection units on main and secondary feeder breakers. Startco SE-105 ground fault and ground check relay c/w associated hardware shall be used to protect each feeder. A Startco SE-325 neutral ground resistor relay c/w associated hardware shall be used to monitor the neutral ground resistor. The main breaker shall be interlocked with the SE-325 and high temperature switch Page 9 of 13

10 6.13 Wiring 1. High Voltage Wiring Provide adequate insulated copper conductors for the operating voltage and specified BIL. Secure the high voltage conductors to withstand thermal and mechanical stresses during transportation and operating conditions (both normal and short circuit fault). 2. Low Voltage Control Wiring Provide 600 volt insulated single conductor, stranded (seven strands minimum) copper heat and flame retardant wiring rated 105 deg.c. Provide extra flexible wires of minimum forty-nine (49) strands for door mounted items. Minimum #14 AWG wiring for controls and minimum #12 AWG wiring for current transformers. Provide wiring in continuous lengths, without splices between connection points, installed in channels or neatly tied and clamped to panel. Provide spare space for terminal blocks and relays to accommodate the maximum number of secondary breakers. Mount terminal blocks for current transformers separate from control terminal blocks. Mount terminal blocks for external connections in instrument compartment grouped, easily accessible, visible and positioned near the compartment's field control cable entry points. 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 a jumper wire is necessary. Use compression type spade connectors where wiring is terminated on hardware (relays, meters, switches, etc.). Soldered connections are not permitted. Terminate all spare contacts on terminal blocks. Identify all wires at both ends with permanent sleeve type wire markers, with wire numbers as shown on the manufacturer's control schematic drawings, with current transformer polarity connections being clearly identified. Where low voltage wiring passes through high voltage compartments, ensure that it is enclosed in metal conduit or fully enclosed metallic raceway Page 10 of 13

11 3. Terminal Blocks For control wiring provide modular snap-on construction terminal block having the following features: - polyamid nylon or melamine insulating housing - foot mounting on either type TS32 or TS35 rail - brass-nickel plated or steel, zinc plated and chromated clamping parts, screw and spring clip - copper or brass current bar - raising cage connector clamping assembly - rated 50A, 600V AC - #20 to #8 AWG wire size - funnelled wire entrance 4. CT Terminal Blocks For current transformer secondary wiring provide modular snap-on construction terminal blocks having the following features: - melamine insulating housing - steel, zinc plated, di-chromated spring clip - brass, nickel plated dual connectors and switch cross link - foot mounting on rail type TS32 - rated 80A, 600V AC - #14 to #6 AWG wire size Page 11 of 13

12 6.14 Nameplates 6.15 Finish 1. Permanently fasten all signs/nameplates to the enclosure. 2. Identify the power centre assembly with a stainless steel or lamacoid nameplate engraved with the following information: - supplier's name - manufacturer's name and logo - Inco purchase order number - assembly shop order number - primary and secondary voltage - number of phases - frequency - rated load in amperes - rated KVA - total weight of unit A transformer nameplate shall also be mounted directly on the transformer and externally on the power centre. 3. Provide laminated phenolic plastic identification nameplates of consistent size having engraved 3/8 inch high black lettering on white background. Identify all compartments and auxiliary equipment. 4. Provide warning signs on all doors and removable panels giving access to high voltage compartment, and on wire mesh screens indicating the maximum operating voltage present. After metal work is completed and prior to the installation of any equipment and wiring, clean the entire structure thoroughly to remove rust, scale, grease and any other foreign material. Unit shall be finished as per Inco Engineering Standard Epoxy Paint System for Steel, Heavy Industrial and Underground. Finish the outside of enclosure in ASA 61 grey and the inside in white. Provide sufficient quantity of touch-up paint to repair minor damage to the finish after installation Page 12 of 13

13 6.16 Ancillary Equipment 1. Provide one 15 amp, GFCI type, duplex/u-ground receptacle (CSA Configuration 5-15R) appropriately mounted and wired complete with all mounting accessories and gasketted spring return cover. The receptacle shall be located on the outside of the unit Testing 1. Subject all equipment to manufacturer's routine shop tests and tests required by the referenced standards and electric supply authority. A copy of these tests shall be submitted with final documentation. 2. Inco reserves the right to inspect materials and equipment or witness test to determine compliance with this specification and release the equipment for shipment. These inspections do not void the supplier's responsibility to supply goods free of defects and expected performance guarantees. END OF STANDARD Page 13 of 13