Spec 11kv Switchgear [PDF]

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SECTION 16320 11 KV SWITCHGEAR

DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

Electrical Specifications Section 16320: 11 KV Switchgear

11 KV SWITCH GEAR TABLE OF CONTENT

1.0

GENERAL

1.1

DESCRIPTION OF WORK

1.2

QUALITY CONTROL/ASSURANCE

1.3

CODES AND STANDARDS

1.4

SUBMITTALS

2.0

PRODUCTS

2.1

11KV METAL CLAD SWITCHGEAR

3.0

EXECUTION

3.1

INSTALLATION

3.2

TEST REQUIREMENTS

VOLUME II Part 3

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DEWAN Building - UAQ

Electrical Specifications Section 16320: 11 KV Switchgear

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

11 KV SWITCH GEAR 1.0

GENERAL

1.1

DESCRIPTION OF WORK Supply, installation, testing and commissioning of HV Switchgears, all related accessories and equipment as specified hereafter and as indicated in the related drawings.

1.2

QUALITY CONTROL/ASSURANCE

1.2.1

The 11KV switchgear shall be designed manufactured tested and installed in accordance with the latest editions and amendments of Electricity Authority regulations and requirements. In case of conflict between the specification and AUTHORITY requirement, the later shall take precedence.

1.2.2

The manufacturer shall have Quality System in compliance with ISO 9001. Certificate of compliance issued by an independent agency shall be submitted. The agency shall be from West Europe or Japan or USA and approved by Electricity Authority.

1.3

CODES AND STANDARDS HV Circuit Breakers Changeover switches Load Bread Switches Current Transformers Voltage Transformers HV Metal Enclosed Switchgear Internal Fault Degree of Protection Provided by enclosures Device Code Numbers Graphic Symbols for Electrical Diagrams

1.4 1.4.1

: : : : : : : : : :

IEC 60056 IEC 60129 IEC 60265 IEC 60185 IEC 60186 IE 60298 IEC 60298 Appendix AA IEC 60529 ANSIE 37.2 IEC 60617

SUBMITTALS Manufacturers Technical Data During the time of the contract and before substantial completion of the electrical installation, submit to CONSULTANT three(3) copies of descriptive literature, technical data, maintenance recommendations(from the equipment manufacturer), catalogues etc.

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DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

1.4.2

1.4.3

Electrical Specifications Section 16320: 11 KV Switchgear

Test Reports Provide test reports prepared in accordance with A U T H O R I T Y requirements to the CONSULTANT (specialist independent labs, KEMA, ASTA, test approvals must be provided for the product by the contractor). Provide other tests reports necessary to establish the adequacy, quality, safety, completed status, and suitable operation of each system. Installation Instructions Submit the complete manufacturers installation instructions of all the products used.

1.4.4

Calculations Forward the following calculations and data: a) b) c) d) e)

1.4.5

Calculations and charts proving that discrimination in the breaker characteristics is achieved. Detailed short circuit level calculation to select the short circuit rating of the various switchboards. Bus bar sizing calculation for each switchboard. Calculation for Temperature rise inside switchboards Load Analysis Report for each substation and logic design for monitoring and control through PLC.

Shop drawings The contractor shall furnish the following drawings and documents along this submittal for approval: a)

b) c) d) e) f) g) h) i) j) k) l) m) VOLUME II Part 3

Dimensioned drawing showing outline of the switch boards arrangement and position of important external features. These drawings shall show masses, crane lift necessary for lifting and size of lifting lugs or eyes, and accesses to inside the panel). Single line diagram showing all auxiliary devices. Original catalogues for various proposed components. Drawings of nameplate and all termination arrangements. Drawing giving typical mechanical and electrical details of the voltage control apparatus. Details of cable terminations and fittings. Foundation plan, including foundation loading. Schematic and connection diagrams covering all equipment pertaining to the switch board. Type and special test certificates as applicable Approved test certificate / test report Schedule of Accessories and Fittings Technical Manual giving installation, operation and maintenance instructions Schedule of recommended spare parts (commissioning and two Page No. 4 of 13

DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

Electrical Specifications Section 16320: 11 KV Switchgear

years operation) 1.4.6

Engineering data to be submitted with the offer

1.4.7

All technical schedules shall be duly filled-in and signed.

1.4.8

Following details shall be submitted: a) General arrangement of the switchgear showing all dimensions b) Details of circuit breakers c) Details of relays d) Single line diagram of the switchgear e) Details of current transformer and voltage transformer f) Catalogues for all major components of the switchgear g) Interlocking diagram h) Detailed technical specification i) Civil layout plan indicating power cable and control cable entry j) Minimum clearances around the assemblies for ventilation and safety. k) Log sheets submittals, shop drawings, method of statements, and approvals shall be submitted by the contractor.

1.4.9

Accessories All accessories required for the operation and maintenance of the switchgear shall be supplied.

2.0

PRODUCTS

2.1

11KV METAL CLAD SWITCHGEAR The switchgear shall be of indoor, metal clad, single bus-bar type equipped with S F 6 c i r c u i t breakers or vacuum circuit breakers. The cubicles shall have internal arc withstand, verified according to six criteria of IEC standards 60298, appendix AA, class A accessibility. The tests shall be carried out for each type of panel and for each of the power components with the LV compartment door open. Type test certificate shall be furnished for the internal arc test.

2.1.1

Construction The switchgears shall be of robust construction and shall be unaffected by the forces imposed by short circuit or other fault currents, operation, vibration or temperature changes. The switchgear shall be metal clad in accordance with IEC 298 standards. There shall be bus bar compartment, circuit breaker compartment, CT/Cable compartment and low voltage compartment. VT shall be provided in the cable compartment for incomer panels. VT shall be provided with HV fuses and draw out type. Safety

VOLUME II Part 3

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DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

Electrical Specifications Section 16320: 11 KV Switchgear

shutters shall be provided for voltage transformers. The galvanized and electro galvanized sheet metal and metal fittings shall be painted to provide protection against corrosion. The epoxy based paint shall have a thickness of at least 50 microns and shall be applied to both sides of sheet metal. The color shall be as per manufacturer's standard. The switchgear shall meet with the degree of protection IP41 minimum. The switchgear shall be designed to prevent access to all live parts when in operation as well as during maintenance work. 2.1.2

Rating The normal continuous rating of the complete switchgear in site conditions of (45 degrees ambient temperature) shall be as specified. The switchgear shall have following ratings: Rated voltage : 12kV Service voltage : 11kV Rated frequency : 50Hz Rated short time current (3 sec) : 25kA Power frequency withstand voltage : 38kV Impulse withstand voltage : 95kV

2.1.3

Temperature rise The temperature rise in any part shall comply with relevant IEC standards specification taking in to consideration of the site ambient temperature.

2.1.4

Bus-bars The bus-bar shall be air insulated hard drawn high conductivity copper bus located in a separate compartment at the top of the cubicle. Provision shall be made for extending the bus bar. Bus-bars shall be of the same cross sectional area throughout the length of the switchgear. Bus-bars and connections shall be fully rated, braced and supported to withstand the dynamic, thermal and dielectric stresses over the full length of the switchgear.

2.1.5

Circuit breakers The circuit breakers shall use SF6 gas or vacuum as the interrupting medium. Circuit breakers shall be draw out type and housed in a trolley. The circuit breaker shall be equipped with an electrical operating mechanism with fast opening and closing, independent of the operator that is operated by a stored energy mechanism. The operating mechanism shall be equipped with:

VOLUME II Part 3

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DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

Electrical Specifications Section 16320: 11 KV Switchgear

a) b) c) d) e)

Push button for opening and closing. Mechanical position indicator for the open and closed positions. Stored energy operating handle Spring charged and discharged position indicator. System for automatic spring discharging when circuit breaker is extracted. f) Anti-Pumping Devices (APD) to prevent pumping action of the mechanism. Trip coil; and close coil shall operate on 48 V DC supply. 2.1.6

Interlocks Following interlocks shall be provided for the switchgear:It shall be possible to close the cable earthing switch with a short circuit making capacity when the circuit breaker is in racked out condition only. Impossible to rack in or rack out the circuit breaker when the earthing switch is closed. Impossible to rack out the closed circuit breaker. Automatic discharging of stored energy spring when the circuit breaker is racked out. Impossible to open the switchgear compartment door unless the device is racked out. Impossible to gain access to the voltage transformers and their protection fuses unless the fuses have been withdrawn.

2.1.7

Current transformers The current transformers shall have the same short time withstand current and rated voltage as the switchgear. They shall be made of cast epoxy resin and shall withstand power frequency withstand voltage as that of the switchgear. CT’s shall be supporting type. Accuracy class of the CTs shall be as per application and in accordance with the relevant IEC standards and to Electricity Authority requirements/regulations.

2.1.8

Voltage transformers The voltage transformers shall be made of cast epoxy resin. The rated output shall match the maximum load of the equipment plus 25%. The preferred secondary voltage is 110 V. Voltage transformers shall of draw out type and provided with HRC fuses. Safety shutters shall be provided for the voltage transformers. Accuracy class of the PTs shall be as per application in accordance with the relevant IEC standards and to Electricity Authority requirements/regulations.

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DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

2.1.9

Electrical Specifications Section 16320: 11 KV Switchgear

Small wiring All wiring shall be 2.5 sq. mm copper conductor, 1000V tropical grade, PVC insulated. All small wiring shall be suitably terminated with circuit numbers.

2.1.10

Earthing of metal parts

2.1.11

All panels shall be interconnected with a copper earth bus running along the switchgear. The cross section of the copper bus shall be designed to withstand the rated short circuit current of the switchgear. Heater In view of the high humidity prevailing in UAE, each panel shall be provided with suitably rated heater for operating from 240V AC. Heater shall be provided with a thermostat.

2.1.12

Relay Microprocessor based multifunction protection, metering and control unit shall be provided for the following functions. These units shall be provided with remote communication facility. For outgoing transformers a) b) c) d) e) f) g) h) i) j) k) l) m) n)

Thermal overload 49 Phase over current 50/51 Earth fault - 50N/51N Phase currents Tripping currents Disturbance recording Peak phase currents Residual current Cumulative breaking current and number of breaks Lock out relay function 86 Inhibit closing 69 Annunciation 30 Logic discrimination 68 Operations counter/phase fault trip counter 74

For Incomers & Bus section: a) b) c) d) e) f) g) h) VOLUME II Part 3

Phase over current 50/51 Earth fault 51N Phase currents Phase- phase voltages & phase-earth voltages (where applicable) Tripping currents Disturbance recording Peak phase currents Residual current Page No. 8 of 13

DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

i) j) k) l) m) n) 2.1.13

Electrical Specifications Section 16320: 11 KV Switchgear

Cumulative breaking current and number of breaks Lock out relay function 86 Inhibit closing 69 Annunciation 30 Logic discrimination 68 Operations counter/phase fault trip counter 74

Test terminal blocks Current transformer secondary wiring shall be connected through terminal blocks with change over links and short circuiting links located at an accessible place. A test block shall be provided on the front of the panel to enable CT circuits to be short-circuited and to permit currents to be injected into the phase and neutral connections of the metering/relay unit.

2.1.14

11kV Cable terminations The cable box shall be suitable for 11kV three-core XLPE double steel tape armored PVC sheathed cables, cable size range 95 to 240 SQMM copper. The cable size shall be finalized at the approval stage. The cable box shall be complete with suitable gland and termination of reputed make.

2.1.15

Labels Each panel of each switchgear shall have a circuit label approximately 30 x 8 cm mounted on the front of the panel. These labels shall be made of suitable engraving material approximately 2 mm thick, white surface with black engraving (laminated plastic material).

2.1.16

Particular Specification for 11KV metal clad switchgear Each Incomer Panel shall include the following items: a) b) c) d) e) f) g)

One SF6 gas or vacuum circuit breaker 11kV, 630A, 25kA draw out type One three phase cable earth switch One three phase cast epoxy resin current transformers of ratio 300-600/5A One three phase voltage transformers with HRC fuses One numerical microprocessor based metering, protection and control unit for Incomer One Trip-Neutral-Close control switch Additional Auxiliary contacts, relays etc. for remote monitoring and on/off control through PLC.

Each Transformer Panel shall include the following items: a) VOLUME II Part 3

One SF6 gas or vacuum circuit breaker 11kV, 630A, 25kA draw out type Page No. 9 of 13

DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

b) c) d) e) f)

Electrical Specifications Section 16320: 11 KV Switchgear

One three phase cable earth switch One three phase cast epoxy resin current transformers of ratio 100/5A. One numerical metering, protection and control unit for Transformer One Trip-Neutral-Close control switch Additional Auxiliary contacts, relays etc. for remote monitoring and on/off control through PLC.

Each Bus section Panel (if applicable) shall include the following items: a) b) c) d) e) f) g)

2.1.18

One SF6 gas or vacuum circuit breaker 11kV, 1000A, 25kA draw out type One three phase cable earth switch One three phase cast epoxy resin current transformers of ratio 1000/5A One numerical microprocessor based metering, protection and control unit for bus section One Trip-Neutral-Close control switch 3 numbers 11,000/1.732: 110/1.732 V draw out voltage transformer with HRC fuses for each bus section Additional Auxiliary contacts, relays etc. for remote monitoring and on/off control through PLC.

Battery (with dual chargers) 11kV metal clad switchgear shall be provided with a dc battery and charger wherever required as per the following specification. The dc supply shall be rated for 48 V DC. The voltage at load terminal shall not drop below 90% nor exceed 110% of nominal value during a battery discharge or with the charger operating in float/boost mode. The dc supply system shall be built into a panel which shall consist of battery bank, battery charger, voltage control unit for regulating the voltage, an earth fault detector and MCB’s. Voltage control unit shall be rated for 150% of the entire switchgear load and it shall be independent from the circuits of the charger. Protection against over discharge of the battery shall be provided. The battery bank shall be minimum 100AH. Batteries shall be of Nickel – Cadmium type. The charger shall be rated for 150% of the entire switchgear load plus the boost charge current of the battery bank. The batteries shall be recharged in less than 24 hours after a discharge. The ac supply rating shall be 240V AC, 50 c/s single phase and the output shall be 48 V DC. The charger shall have ac input on lamp, dc output voltmeter and ammeter, a lamp for indicating boost/float charge. A lamp for indication of charger defective shall also be provided. The charger shall have a voltage regulation of + 2% of set value or better and have an output ripple content of less than

VOLUME II Part 3

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DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

Electrical Specifications Section 16320: 11 KV Switchgear

2%. Automatically switch in to the boost charging mode when battery is discharged beyond value and return back to float charge mode after recharging. The charger shall have built in over voltage protection and should have a soft start feature. The panels shall be free standing and made of steel. The panels shall be suitably painted with anti-corrosive paint. The system shall be designed such that during normal mode, the charger shall be operating either in float charge or boost charge mode. At this time, the battery shall be charged as well as fed via voltage control unit to the connected load. When one charger module is failed, the charger shall continue to feed the connected load. While the charger is in service, it shall be possible to remove and replace the defective module by a new one without affecting the system operation. When ac supply in feed is lost, the battery shall supply the load. Only reputed Western Europe or USA or Japan makes of battery and charger shall be supplied by the contractor. 2.1.19

Technical Particulars – 11KV Switchgear S. No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

VOLUME II Part 3

Description General Manufacturer Country of Origin Type of Switchgear Standards Rated voltage (kV RMS) Max. system voltage Number of phases Rated frequency Power frequency withstand voltage Impulse withstand voltage Rated busbar current Rated short circuit current Rated short time current (3 sec) Rated peak withstand current Rated voltage of auxiliary circuits Approximate dimensions (LxDxH) mm Circuit breaker

Specified

Proposed

IEC 298 11 12 3 50 Hz 38 kV 95kV 630A/ 1000A 25kA 25kA 62.5kA 48 V DC

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DEWAN Building - UAQ

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

S. No

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Description Type & Make Interrupting medium Rated voltage Max. System voltage Power frequency withstand voltage Impulse withstand voltage Rated normal current Rated frequency Short time withstand current (3 sec) Rated voltage of auxiliary circuits Power consumption in W Number of operations (Mechanical) Standards Rated primary voltage Ratio Burden Short time withstand current (3 sec) Maximum voltage Power frequency withstand voltage Impulse withstand voltage Standards

3.0

EXECUTION

3.1

INSTALLATION

Electrical Specifications Section 16320: 11 KV Switchgear

Specified

Proposed

SF6/Vacuum 11kV 12kV 38kV 95kV 630A 50 Hz 25 48 V DC

IEC 56 11kV

12kV 38kV 95kV IEC 60185

Installation of the switchboard shall be strictly in accordance with manufacturer’s recommendations, AUTHORITY requirements and to CONSULTANT approval. 3.2

TEST REQUIREMENTS

3.2.1

Type Tests Type tests shall be carried out in accordance with IEC 298 provided that additional requirements specified (e.g., bus bar insulation) are taken into consideration. Certificates shall be available at the quotation stage. Certificates issued by independent testing laboratories are required.

3.2.2

Routine Test Before leaving the works the MANUFACTURER shall carry out the routine tests in accordance IEC 298 on the total assembly or parts thereof when delivered with time intervals, and the results shall be recorded in a test report.

VOLUME II Part 3

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DEWAN Building - UAQ

Electrical Specifications Section 16320: 11 KV Switchgear

Block 1, Sector 8 Plot 6, Al Khor 1, UAE

CONSULTANT or his authorized representative shall witness the final routine testing. Notification shall reach the CONSULTANT at least ten working days before the testing takes place. Inspection and tests shall be carried out on the complete assembled switchgear. Transportable units can be wired together instead of completing bus bar joints. The following checks and test shall at least be carried out. Switchgear shall be visually inspected on technical execution and conformity with the latest issue of the approved drawings and with the order. Spot checks shall be made to verify: a) b) c) d) e) f) g) h) i) j) k) l) m) n) o)

The degree of protection of the enclosure, The degree of protection within the compartments, The effectiveness and reliability of safety shutters, partitions and shrouds, The effectiveness and reliability of operating mechanisms, locks and interlock systems, The insulation of the bus bar system, The creepage distances and clearances, The proper mounting of components, The internal wiring and cabling system, The correct wiring of main and auxiliary circuits, The suitability of clamping, earthing and terminating arrangements, The correct labeling of functional units, The completeness of the data on the nameplate, The availability of the earthing system throughout the switchgear, The interchangeability of electrically identical components, The non-interchangeability of mechanically identical but electrically different components.

Insulation resistance test using 30KV HV test kit, between each phase against earth, with the two remaining phases connected to earth. The insulation resistance tests shall be carried out with all manually operated and latched type switching devices in the service and closed position and all main fuses installed. Dielectric test shall be carried out in accordance IEC 694 clause 4.2.1 table 1. Testing of the mechanical and electrical operation of a number of functional units on random basis, including their control and protective devices.

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VOLUME II Part 3

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