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Specification for Tender- 582763457 General Specification for High Voltage metal-enclosed cubicles from 1 to 24 kV This is the common article to use for mainly prescription and tendering purposes. Content of it; General condition, Standards, Rated values, Main system parameters, General acceptation parameters, Type & routine tests, Quality futures Last update : 2017-05-08 -1- Specification for Tender- 582763457 Table of contents: 1. General conditions ……………………………………………………….............................. p. 3 2. Standards ……………………………………………………………………………………. p. 3 3. Rated voltage and short-time withstand current……………………….............................. p. 3 4. System parameters ………………………………………………………………….............. p. 4 4.1 Main electrical characteristics …………………………………………................................. p. 4 4.2 General characteristics ………………………………………………………….................... p. 4-5 5. General requirements relative to the design and manufacture of the switchgear............. p. 5 5.1 Introduction ………………………………………………………......................................... p. 5 5.2 Switchboards ………………………………………………………….................................. p. 5-6 5.3 Earthing of metallic parts ……………………………………………….............................. p. 6 5.4 Earthing of the power circuit ………………………………………………………….......... p. 6 5.5 Switches …………………………………………………….................................................. p. 6-7 5.6 Circuit breakers …………………………………………………………............................... p. 7 5.7 Busbars ………………………………………………………............................................... p. 8 5.8 Connections…………………………………………………………………………………. p. 8 5.9 Operating mechanisms ………………………………………………………….................... p. 8 5.10 LV cabinet ……………………………………………….......................................................... p. 9 5.11 Current transformers ………………………………………………………………............. p. 9 5.12 Low Power Current transformers (LPCT)…… …………………………............................ p. 9 5.13 Voltage transformers …………………………………………………................................. p. 9 5.14 LV auxiliaries …………………………………………………............................................ p. 9-10 5.15 Control and monitoring …………………………………………………………………...... p.10 5.16 Voltage indicator and phase comparators ………………………………………………….. p.10 5.17 Fault Passage Indicators ……………………………………………………………………. p.10 5.18 Safety of people …………………………………………………………………………….. p.10 5.19 Automatic Transfer System ……………………………………………………………….. p.11 6. Type tests and routine tests ……………………….....................……................................... p.11 7. Quality …………………………………………………………….....................……............. p. 11 Last update : 2017-05-08 -2- Specification for Tender- 582763457 1. General conditions The following specifications apply to modular indoor switchboards comprising factory built, metal-enclosed switchgear assembles. The equipment to be supplied shall consist of modular cubicles satisfying the following criteria: - open-ended design, - easy to install, - safe and easy to operate, - compact design, - low maintenance. The supplier must be able to prove its extensive possess experience in the field of MV switchgear, and has already supplied equipment of the same type & production process, in which has been in operation for at least three years. 2. Standards The switchgear shall comply with the latest issues of the following IEC recommendations: - IEC 62 271-200 - IEC 60265-1 - IEC 62271-102 - IEC 60694 - IEC 62271-105 - IEC 62271-100 - IEC 60282-1 - IEC 60185 - IEC 60186 - IEC 60801 - IEC60529 Alternative current metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV, Switches for rated voltages above 1kV and less than 52kV, High voltage alternative current disconnectors and earthing switches, Common specifications for high voltage switchgear and controlgear standard, High Voltage alternative current switch-fuse combinations, High Voltage alternative current circuit breakers, MV fuses, Current transformers, Voltage transformers, Electromagnetic compatibility for industrial process measurement and control equipment. Degrees of protection provided by enclosures (IP code) 3. Rated voltage and short-time withstand current 3.1 The switchgear shall be suitable for three-phase systems operating at 24 kV, and 50 Hz. (Please, consult us for 60 Hz) 3.2 The rated voltage shall be at least 24 kV. 3.3 The short-time withstand current (Ik/tk) shall be 25 kA/1s up to 24kV. (Please, consult us for 2 s and 3 s) All switchgear shall be capable of withstanding the above conditions without provoking damage, in accordance with paragraphs 4.5, 4.6 and 4.7 of IEC 60694 and paragraph 4.5 of IEC 62 271-200 recommendations. Last update : 2017-05-08 -3- Specification for Tender- 582763457 4. System parameters The insulation level of the switchgear shall comply with IEC recommendations and the values indicated in the following table. 4.1 Main electrical characteristics The hereunder values are for working temperatures from -5° C up to +40° C and for a setting up at an altitude below 1000 m. (Please, consult us for out of range temperatures’ and over 1000 m application) ---------------------------------------------------------------------------------------------------------------------------rated voltage (kV) Ur 7.2 12 17.5 24 ---------------------------------------------------------------------------------------------------------------------------insulation level ---------------------------------------------------------------------------------------------------------------------------50/60 Hz / 1 mn Ud insulation 20 28 38 50 (kV rms) Ud isolation 23 32 45 60 ---------------------------------------------------------------------------------------------------------------------------1,2/50µs Up insulation 60 75 95 125 (kV peak) Up isolation 70 85 110 145 ---------------------------------------------------------------------------------------------------------------------------transformer off load (A) 16 cables off load (A) 31.5 --------------------------------------------------------------------------------------------------------------------------short –time withstand current at 25 630 - 1250 A Ik/tk (kA/1s) 20 630 - 1250 A 16 630 - 1250 A (Please, consult us for 2s and 3s) 12.5 400 - 630 - 1250 A ------------------------------------------------------------------------------------------------------------------------------making capacity at 62.5 630 A Ima (kA) 50 630 A 40 630 A 31.25 400 - 630 A ------------------------------------------------------------------------------------------------------------------------------- 4.2 General characteristics ---------------------------------------------------------------------------------------------------------------------------Maximum breaking capacity (Isc) ---------------------------------------------------------------------------------------------------------------------------rated voltage (kV) 7.2 12 17.5 24 ---------------------------------------------------------------------------------------------------------------------------switch unit (A) 630 - 800 fuse-switch unit (kA) 25 25 20 20 Contactor unit with fuses (kA) 25 25 Circuit breaker unit (kA) 25 25 25 25 Last update : 2017-05-08 -4- Specification for Tender- 582763457 ---------------------------------------------------------------------------------------------------------------------------Endurance ---------------------------------------------------------------------------------------------------------------------------units mechanical electrical endurance endurance ---------------------------------------------------------------------------------------------------------------------------switch unit (*) IEC 60265-1 IEC 60265-1 1000 operations class M1 100 breaks at In,pf = 0.7classE3 contactor unit 400 IEC 60470 IEC 60470 300 000 operations 100 000 breaks at 320 A 300 000 breaks at 250 A contactor unit 400D 100 000 operations 100 000 breaks at 200 A circuit breaker unit IEC 62271-100 IEC 62271-100 10 000 operations 40 breaks at 12.5 kA 10 000 breaks at In,pf=0.7 ---------------------------------------------------------------------------------------------------------------------------(*) as per recommendation IEC 62271-105, three breaking at pf = 0,2 1730 A / 12 kV 1400 A / 24 kV 2600 A / 5,5 kV 5. General requirements regarding the design and manufacture of the switchgear 5.1 Introduction The equipment shall satisfy the criteria for indoor, metal-enclosed switchgear class LSC2A & Class PI partitioning in accordance with paragraph 3.131.1; 3.109.2& 5.102 of 2003-11 edition of IEC 62271-200 recommendations. The cubicles shall be designed with three compartments housed in a single enclosure: - switchgear compartment, - busbar compartment, - connection compartment, (shall be interlock-controlled accessible) 5.2 Switchboards The switchboards shall be made up of separate factory built cubicles housing the switchgear (switchdisconnector and switch enclosures shall be mounted horizontally in the cubicles and the circuit breaker shall be disconnectable and mounted vertically). The cubicles therefore form a compartmented distribution switchboard that can be extended if necessary. The cubicles shall meet the requirements of degree of protection index IP3X. The galvanised and electrogalvanised sheet metal and metal fittings shall be painted to provide protection against corrosion. The epoxybased paint shall have a thickness of at least 50 micronsmeter and shall be applied to both sides of all sheet metal. The colour shall correspond to the RAL colour range proposed. The switchboard shall be suitable for mounting above cable trenches, crawl spaces or base structures. Last update : 2017-05-08 -5- Specification for Tender- 582763457 Each cubicle shall carry a suitably dimensional identification label clearly indicating the functions and electrical characteristics of the cubicle in accordance with chapter 5.10 of IEC 62271 -200. The switchgear and the switchboards shall be designed in such a way that the positions of the various switchgear devices shall be visible by the operator from the front of the switchboard. It shall also be possible to operate the switchgear from the front of the switchboard. The civil works specifications shall be unique for all cubicles making up the MV switchboard. The cubicle widths shall be multiples of 375 mm. In particular, the civil works for the circuit breaker cubicles shall be identical to the civil works for the switch cubicles. The manufacturer shall provide an installation drawing to serve as a guide for the civil works. In accordance with applicable standards, the switchboards shall be designed to prevent access to all live parts when in operation as well as during maintenance work. 5.3 Earthing of metallic parts The earthing bars of each of the cubicles making up the switchboard shall be interconnected by a set of busbars, which shall be connectable outside the switchboard and extend over its full width. The cross-section of the busbars shall be determined so as to withstand the rated short-circuit current of the switchgear in accordance with IEC 62271-200 recommendations. The earthing bar shall be designed for connection to the main earthing bar of the substation without dismantling any of the bars. 5.4 Earthing of the power circuit Cable earthing shall be carried out by an earthing switch with a short-circuit making capacity, in accordance with IEC 62271-102 recommendations. It shall be possible to operate the earthing switch when the switch or disconnector is open. A padlocking system shall be provided to lock the earthing switch in either open or closed position. The position of the earthing switch shall be clearly visible from the front of the cubicle. Mechanical interlocking (padlocking) systems shall be provided to prevent incorrect operations such as the closing of the earthing switch with the switch or disconnector in closed position. The use of keyed or electric locks to actuate the above mentioned interlocking system shall not be accepted. 5.5 Switches The switches shall use low pressure SF6 gas for current interruption and shall require no maintenance. The switch enclosure shall be mounted horizontally within the cubicle and the position of the main and earthing contacts shall be clearly visible from the front of the cubicle. The position indicator shall be placed directly on the contact-operating shaft. The open and earthed positions of the main moving contact shall be visible (inspection windows) from the front of the cubicle upon the customer request. Last update : 2017-05-08 -6- Specification for Tender- 582763457 The switch enclosures shall be made of cast epoxy resin that shall be capable of bearing for mechanical strength, as well as electromagnetic forces. The switches shall be of the high operating frequency type in accordance with paragraph 3.104 of IEC 60265-1 recommendations. They shall have three positions (closed, open and earthed) and shall be fully assembled and tested before leaving the factory. The relative pressure of the SF6 gas inside the enclosure shall not exceed 0.4 bars (400 hPa). The pole unit enclosures shall be of the “sealed pressure system” type as defined by IEC 62271-200 chapter 3.118.2 recommendations. Leakage rate shall not be over 0.1% for life span that is at least 30 years. No refilling of the gas shall be required over this period. Switch units requiring maintenance or gas refilling will not be accepted. Switch units would be equipped with analog or pressure switch. Both of them shall be temperature compensated. Pressure switch shall provide 2 level of indication that are low level and critical level. The mechanical endurance of the switch operating mechanisms shall ensure at least 1000 operations. 5.6 Circuit breakers 5.6.1 SF6 The circuit breakers shall be mounted vertically and shall be disconnectable. They shall use SF6 gas as the current interruption medium. They shall require only minimum maintenance and shall provide a high level of electrical endurance. The position of the circuit breaker shall be clearly visible. Furthermore, the circuit breakers shall be mechanically interlocked with the power circuit disconnector. The pole units shall be made of cast epoxy resin and shall be fully assembled and tested before leaving the factory. The relative pressure of the SF6 gas shall not exceed 2 bars (2000hPa). The pole units shall be of the “sealed pressure system” type as defined by IEC 62271-100, with a service life of at least 30 years. No refilling of the gas shall be required over this period. Circuit breaker pole units requiring maintenance, inspection or gas refilling will not be accepted. The mechanical and electrical endurance shall ensure at least 10,000 operations. The circuit breakers shall be covered with test reports that are issued by a recognised organisation affiliated with an international organisation. 5.6.2 Vacuum The circuit breakers shall be mounted vertically and shall be disconnectable. They shall use vacuum as the current interruption medium. They shall require only minimum maintenance and shall provide a high level of electrical endurance. The position of the circuit breaker shall be clearly visible. Furthermore, the circuit breakers shall be mechanically interlocked with the power circuit disconnector. The pole units shall be fully assembled and tested before leaving the factory. The pole units shall be of the “sealed pressure system” type as defined by IEC 62271-100, with a service life of at least 30 years. Circuit breaker pole units requiring maintenance, inspection will not be accepted. The mechanical and electrical endurance shall ensure at least 10,000 operations. Last update : 2017-05-08 -7- Specification for Tender- 582763457 The circuit breakers shall be covered with test reports that are issued by a recognised organisation affiliated with an international organisation. 5.7 Busbars The busbar compartment shall be located at the top of the cubicle. It shall include three parallel-mounted bars without phase separating means. Connections shall be made to the top pads of the switch or disconnector enclosures. Access to the busbars shall only be possible after removing a single access panel carrying a symbol warning of the danger of electrical shock. No other busbar access system will be accepted. 5.8 Connections The HV cable connection pads shall be designed to accept simplified terminations for dry-type cables or to accept paper-insulated cables impregnated with a non-draining material. Access to the connection compartment, shall be interlock-controlled accessible, and shall only be possible after closing the earthing switch. No other access mode will be accepted. 5.9 Operating mechanisms The operating mechanisms shall provide in front all the necessary means for operating the switches, disconnectors and circuit breakers. 5.9.1 Load break switch The operating mechanism box shall include a switch and earthing switch position indicator fixed directly to the shaft of the moving pole, thereby satisfying the positive break criteria. This box shall also house the voltage indicators and the mechanical “fuse blown” indicator for fuse-switch combination units. The box shall be accessible with the cables and busbars live, without isolating the entire switchboard, and shall be designed for easy installation of padlocks, key locks, auxiliary contacts, releases and the usual LV accessories. The front cover of the operating mechanism shall be suitable for the application of all symbols, mimic diagrams, nameplates and padlocking fixtures required by the function implemented. All switch and earthing switch operations shall be carried out with an anti-reflex lever and shall be independent of the action of the operator after charging the operating mechanism springs. The operating mechanisms shall be so constructed that can come out of their neither open nor closed positions by forces arising from gravity, vibration, reasonable shocks or accidental touching of the lever of their operating devices, or by electromagnetic forces. 5.9.2 Circuit breaker The operating mechanism box shall include: mechanical “open/closed” position indicator, “charged/discharged” indicator for the operating mechanisms springs, spring charging lever forming an integral part of the operating mechanism; circuit breakers not satisfying this condition will not be accepted, Last update : 2017-05-08 -8- Specification for Tender- 582763457 local means for opening and closing the circuit breaker, local means for manually discharging the springs. It shall be possible to add, on site, a motor mechanism for electrical charging of the operating mechanism as well as the necessary accessories. 5.10 LV cabinet The LV cabinet shall be included in the overall volume of the cubicle. It shall be designed to house the various LV elements required for the operation of the motor mechanism and auxiliary equipment. For specific needs, it shall be possible to enlarge or extend the LV box by adding an enclosure with a door to the top of the cubicle. The overall height of the cubicles shall not exceed 2225 mm. In all cases, these volumes shall be accessible with the cables and busbars live, without isolating the entire switchboard. LV cabinet not satisfying these criteria will not be accepted. 5.11 Current transformers The current transformers shall have the same short-time withstand current and rated voltage as the switchgear. It shall be made of cast epoxy resin and must be labelled individually. The manufacturer shall be in a position to provide type-test reports certified by an approved laboratory affiliated with international organisations. Current transformers not satisfying these criteria will not be accepted. 5.12 Low Power Current transformers (LPCT) The LPCT is a magnetic sensor in which provides a voltage output that represents the primary current, and shall meet the characteristic of switchgear. It shall be in accordance to IEC 60044-8, and shall have two type of application in which medium voltage LPCT that shall be made of cast epoxy resin protection, and low voltage LPCT that shall be made of plastic protection. And, both must be labeled individually. It shall be easily installed, and shall be direct connection (plugging) to protection relay. LPCT not satisfying these criteria will not be accepted. 5.13 Voltage transformers The voltage transformers shall be made of cast epoxy resin and must be labeled individually. Depending on the needs, they shall be of the phase-to-phase or phase-to-earth type. They shall be protected by MV fuses or by circuit breakers on the power circuit. The manufacturer shall be in a position to provide type-test reports certified by an approved laboratory affiliated with international organisations. Voltage transformers not satisfying these criteria will not be accepted. 5.14 LV auxiliaries Auxiliary equipment shall satisfy section 5.4 of IEC 62 271-200 recommendations. The LV cables shall be class 2 type with a 2000 V insulation level. Last update : 2017-05-08 -9- Specification for Tender- 582763457 They shall be marked at each end for easy verification during maintenance or servicing work. The cable cross-sections shall not be less than 2.5 sqmm for circuits carrying high currents, or 1 sqmm for other circuits. 5.15 Control and monitoring All the relays, instruments and meters shall be incorporated in the LV box located at the top of the cubicle. The relays shall be of the “integrated unit” type, meeting all protection and automatic control needs. They shall comply with IEC 60801.4 and 50263 recommendations concerning electromagnetic compatibility. If necessary, they shall be able to communicate: - using standardised protocols, - adapting to a wide range of power supply voltages, - with the possibility of being disconnected while live without any danger to installation, - storing the information in memory in the event of an auxiliary power failure. The manufacturer shall provide proof that he has already supplied equipment of the same type and same make and that this equipment has been in operation for at least three years. 5.16 Voltage indicators and phase comparators Function shall be able to be equipped with a voltage indicator box on the front of the device to indicate whether or not there is voltage in the cables. The capacitive dividers will supply low voltage power to the lamps. Three inlets can be used to check the synchronization of phases. This device shall be in compliance with IEC 61958 standard. 5.17 Fault Passage Indicators Load break switch function shall be equipped with a fault passage indicator (FPI), in order to detect and localise easily the faulty part of the network. The latter FPI shall segregate the short circuit and earth faults, shall indicate permanently the phase-perphase load currents, and shall easily actuate a remote indication lamp. The FPI fault detection core function shall be self-powered without help external power supply or built-in batteries. 5.18 Safety of people Any accidental overpressure due to internal arc in one of three compartments of the functions shall be resist, and gas shall be exhaust to the rear of the switchboard away from the operator. Manufacturer shall provide type test report to prove compliance with IEC 62271-200 Annex A for two different Internal Arc performance; IAC: A-FL at 12.5kA/1s with downstream exhaust, And, IAC: A-FLR at 16kA/1s with downstream, and upstream exhausts. Last update : 2017-05-08 - 10 - Specification for Tender- 582763457 5.19 Automatic Transfer System (ATS) ATS switchgear shall give automatic control and management of sources in the medium voltage. The minimum time to switch from one source to second source shall be between (minimum) 0.34s to 2.24s that would be adjustable. Switchgear shall be equipped with mechanical and electrical interlacing to avoid any wrong operation. Switchgear shall guarantee parallels operation by mechanical and electrical synchronization. 6. Type tests and routine tests Depending on switchboard, type-test certificates may be required for the equipment, including the switches and the circuit breakers. - impulse dielectric tests, - power frequency dielectric tests, - temperature-rise tests, - short-time withstand current tests, - mechanical operating tests, - verification of the degree of protection, - internal arc withstand In addition, for the switches and circuit breakers, the rated making and breaking capacities shall be substantiated by a test report. For the earthing switch, the making capacity, the short-time withstand current and the corresponding peak value shall be substantiated by a test report. The routine tests carried out by the manufacturer shall be substantiated by a test report signed by the manufacturer's quality control department. The report shall cover the following aspects: - conformity with drawings and diagrams, - power frequency tests, - manual operating mechanism tests, - functional tests of LV auxiliaries and relays. 7. Quality If requested by the client, the supplier shall provide proof of application of a quality procedure complying with standards. This means: - use of a quality manual approved and signed by a management representative, - regular updating of this manual so that it reflects the most recent applicable quality control procedures, - ISO 9002; 9001 certification and also ISO 14001. Last update : 2017-05-08 - 11 -