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2.1 Medium Voltage Motor Starter Assly - engineering site

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2.1 Medium Voltage Motor Starter Assly - engineering site

    Specification for Tender 725493157.doc

    General Specification for Indoor Medium

    Voltage Air-insulated Motor Starters

    1. General

    2. Product

Last update : 2013-11-148 - 1 -

    Specification for Tender 725493157.doc Table of contents:

    1. General……………………………………………………………………………………………….. 3 1.1 Section includes……………………………………………………………………………………. 3 1.2 Standards............................................................................................................................................ 3

    1.3 Quality Assurance………………………………………………………………………………….. 3 2. Equipment………………………………………………………………………………………….... 5 2.1 Medium Voltage Switchgear Assembly…………………………………………………........……. 3 - 4 2.2 Ratings…………………………………………………………………………………………........ 4 2.3 Switching Devices ………………………………..…………………………………...……........... 4 - 5 2.4 Current and Voltage transformers ………......................................................................................... 5 2.5 Power Busbars and Earthing Circuit……………………………………………………………....... 5 - 6 2.6 Protection and Control System………………………..…………………………………................. 6

Last update : 2013-11-148 - 2 -

Specification for Tender 725493157.doc

    1. General

    1.1 Section includes

    1.1.1 The Contractor shall supply the medium voltage switchgear as specified herein. 1.1.2 Switchgear application describes air-insulated metal-enclosed medium voltage switchgear. 1.1.3 Medium voltage switchgear is designed to equip high power indoor {Option:} [HV/MV], [MV/MV]

    switchboards.

1.2 Standards

    Medium voltage switchgear shall be designed, manufactured, assembled and tested in accordance with the following standards:

    1.2.1 IEC 62271-1 Common specifications for high-voltage switchgear

    1.2.2 IEC 62271-200 AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV

     and up to and including 52 kV

    1.2.3 IEC 60470 High voltage alternating current contactors and contactor based motor starter 1.2.4 IEC 62271-102 AC disconnectors and earthing switches.

    1.2.5 IEC 60265-1 High-voltage switches

    1.2.6 IEC 60282-1 High-voltage fuses

    1.2.7 IEC 60255 Measurement relay and protection unit

    1.2.8 IEC 61850 Communication networks and systems in substations

    1.2.9 IEC 60044-1 Current transformers

    1.2.10 IEC 60044-8 Electronic current transformers

    1.2.11 IEC 60044-2 Voltage transformers

    1.2.12 IEC 61958 High-voltage prefabricated switchgear and controlgear assemblies

     Voltage presence indicating systems

    1.2.13 IBC 2000 Seismic Standards

1.3 Quality Assurance

    1.3.1 Manufacturer: Company specializing in medium voltage metal-enclosed switchgear with at least 30 years documented experience. The manufacturer of the switchgear must be the same as the manufacturer of the circuit breaker and contactor devices.

    1.3.2 Conformity assessment: Manufacturers of MV switchgear shall be able to manage a first party conformity assessment procedure, as defined by ISO 17000, and provide the associated deliverable “Declaration of Conformity”. The supplier shall ensure the validity of the declaration over the time.

    2. Equipment

    2.1 Medium Voltage Motor Starter Assembly

    2.1.1 The switchboards shall be modular and extensible at site. They shall comprise functional units as defined by IEC 62271-200. The factory-made functional units shall be bolted together at the place of use. 2.1.2 All functional units such as SoftStarter, autotransformers, 2speed, reversing shall have the characteristics defined in this specification and shall form one contiguous switchboard. 2.1.2 Switchboard dimensions:

    2.1.2.1 {Option :} [the width of standard motor starter shall be less than 400mm] [For all other standard switchgear, the panel width shall be no wider than 750mm]

    2.1.2.2 All standard cubicles of the switchboard shall have the same height and depth, which shall be no more than 2300mm and 950mm.

    2.1.3 The cubicle outer enclosure shall have a degree of protection of {option :} [IP3X] [IP4X] [IPX1]

    [IPX2]. The partitions between compartments of the same cubicle shall have IP2XC.

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Specification for Tender 725493157.doc

    2.1.4 The cubicle shall be of LSC 2A (Loss of Service Continuity) and IM (Partition Class) classes as defined by IEC standard 62271-200. And it shall comprise three electrically independent compartments and one LV cabinet:

    - Busbar compartment

    - Contactor compartment

    - Low voltage cabinet

    2.1.5 Cable and bar connections: Power connection in standard cubicles shall be [bottom-entry cable

    connection] [top-entry cable connection].

    2.1.6 {Option :} Internal Arc Class (IAC)

    2.1.6.1 The cubicles shall be internal arc classified by IEC 62271-200 of {option :} [25kA 1s] [31.5kA 1s]

    [40kA 0.5s] [50kA 0.25s], AFLR.

    2.1.6.2 A tunnel shall be provided to divert the hot gasses, in case of installation in a room with limited ceiling height (less than 4000mm).

    2.1.7 Autotransformer starters, reversing motor starters, Dahlander motor starters and 2 speed 2 winding motor starters shall be provided with both mechanical and electrical interlocks between the associated contactors.

    2.1.7 There shall be permanent monitoring of the temperature rise of the power circuits, in order to avoid the temperature reaching the stage where equipment is damaged. The temperature monitoring system shall use optical fibres and sensors.

    2.1.8 The plates used as the visible parts of the switchboard shall be painted. All non-painted steel parts shall be zinc-plated or galvanized.

    2.1.9 {Option:}The switchboard shall meet international {option:} [seismic] [marine] specifications. 2.2 Ratings

    2.2.1 Medium Voltage Motor Starters shall have the following ratings:

    MV Motor Starter Ratings

    rated voltage kV [3.3] [7.2]

    rated insulation level kV 20/60

    rated current of the busbar A [630] [1250] [2500] [3150]

    rated current of contactor A [200] [400]

    rated short-time withstand current and duration kA/s [25][31.5][40]/3s [50] / 2s

    Internal arc withstand (AFLR) [25kA 1s] [31.5kA 1s] [40kA 0.5s] [50kA 0.25s]

    oC. The cubicles shall not require forced ventilation. 2.2.2 Equipment shall not require de-rating at 50

2.3 Switching Devices

    2.3.1 It is mandatory for the switching devices that equip the functional units to be made by the switchboard supplier, or by a manufacturing plant that belongs to the same company.

    2.3.2 Functional units shall be contain a withdrawable contactor,

    2.3.2.1 A disconnector to visibly isolate the contactor shall be able to be locked out individually by a padlock. 2.3.2.2 Racking in and racking out operations shall be carried with an open door when both the disconnector and earthing switch are earthed.

    2.3.3 Contactor:

    2.3.3.1 The breaking medium of the contactor shall be vacuum.

    2.3.3.3 The contactor shall be designed for AC3/AC4 duty. They shall have a electrical endurance of 250,000 operations and a mechanical endurance of 2,500,000 operations.

    2.3.4 Cable earthing switch:

    2.3.4.1 The earthing switch shall have a making capacity to safely earth the motor cables in accordance with IEC standard 62271-102.

    2.3.4.2 It shall be mechanically interlocked with the main switching device. Solutions involving key-locking, padlocking or electrical locking are not acceptable.

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Specification for Tender 725493157.doc

    2.3.4.3 A {option:}[key-locking] [padlocking] system shall allow the earthing switch to be locked in the

    {option:}[open] [closed] position.

    2.3.4.4 The operation devices of earthing switch, as well as {option :} [key-locking] [padlocking] devices

    and voltage present indicators, shall be grouped in dedicated area.

    2.3.5 Operation of switching devices

    2.3.5.1 Only one handle shall be used for all operations (operating the disconnector, open/close earthing switch). This operation handle shall be “anti-reflex” type to ensure operators safety, and

    the storage of the handle shall be inside cubicle and accessible without opening the door.

    2.3.5.3 The operations of the disconnector, the contactor and the earthing switch must be done from the front of the switchboard. When the operations are completed, they shall be confirmed by means of dedicated indicators.

    2.3.5.4 Operations of disconnector, the contactor and the earthing switch shall be described solely in the form of explicit symbols and colour codes. Instruction using texts will not be accepted. There shall be indicators to show the position of switching devices.

2.4 Current and Voltage Sensors

    2.4.1 Current sensors:

    {option:} 2.4.1.1 Phase-phase sensors

    - [electronic current sensor (LPCT)]

    - [conventional current transformer

    2.4.1.2 Zero sequence current sensors

    - Zero sequence core balance current transformers

    2.4.2 Voltage sensors:

    2.4.2.1 The voltage sensors shall be installed at the bottom of functional units, in front of the cables. 2.4.2.2 The voltage sensors shall be open delta type. The fuses (if applicable) shall be front accessible.

2.5 Power Busbars and Earthing Circuit

    2.5.1 Power busbars:

    2.5.1.1 A flat copper main busbar shall ensure the flow of power within the switchboard. The busbars shall be flat, parallel, and identical within each cubicle.

    2.5.1.2 The busbars shall be {option :} [bare] [insulated].

    2.5.1.3 All busbars should be tin or nickel plated to prevent corrosion.

    2.5.1.4 Other internal power connections shall be flexible to permit connections for various motor starter configurations.

    2.5.2 Earthing circuit:

    2.5.2.1 There shall be earth conductors which are made of copper, and earthing circuit must have verified the rated short-circuit current withstand of the main circuit, in accordance with IEC 62271-200.

    2.5.2.2 The earth conductors of all cubicles shall be connected to one another as well as connected to the main earth conductor. The main earth conductor shall be installed in the connection compartment.

2.6 Protection and Control System

    2.6.1 The functional units shall be equipped with integrated digital protection and control units, which include the protection, automation, measurement, metering, monitoring, diagnosis and communication functions.

    2.6.2 {Option:}Protection system shall be able to use electronic sensors.

    2.6.3 The switchboard shall integrate Web technologies, so that information about electrical installation can be found out by opening a Web page.

Last update : 2013-11-14 - 5 -

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