B65_Teil3_Steuerung_e_11_2004

> Title of presentation - Date - References2 2

GIS B65Table of contents Teil 2

10. Local control system

11. Type tests, Production test, Site test

12. Transport

13. Installation on site

14. Maintenance

15. Example of GIS B65


GIS B65

9.9. Local control systemLocal control system

- Design, function of the control system


GIS B65Local control

Local control as part of the GISLocal control as part of the GIS



is the GIS interface cubicle to all secondary systems of a substation like Station Control and Protection.

includes control and protection functions as well as the correct distribution of auxiliary power supply for the relevant GIS bay.

is in charge for a save and reliable operation and monitoring of all switchgear elements.

The Local Control Cubicle (LCC):



AC-Supply for:

heatings, panel lightning, panel sockets

DC-Supply for:

control and motor drives

General control functions:

remote & local control, interlocking bypass, double action prevention of the mechanisms

Main functions realized in the Local Control Cubicles:




Control of Disconnectors & Earthing switches:

ON/OFF control, supervision of operating times and intermediate positions

Control of Circuit Breakers:

control of the closing and tripping coils, anti-pumping, interface to synchronizing devices, interface to protection devices, supervisionof pole discrepancy and spring charging time

Protection (if integrated in the LCC)



Interlocking:

interlocking between the high voltage mechanisms on the GIS

Human Machine Interface (HMI):

mimic equipped with control switches and position indicators

Alarm indication & Signalisation:

alarm unit for alarm indication and signalisation




Supervision of SF6-Gas Compartments:

supervision of the gas pressure (stage 1, stage 2)

Transformers & Measuring:

metering, measuring, protection




Detailed description of functions for a local control realized on the base of conventional relay control:



AC / DC supply:- The AC / DC supply for the control and the motors of the

mechanisms is distributed with miniature circuit breakers

(MCB).- Each cubicle has its own voltage distribution.- Separate MCB for motor voltage, control voltage,

interlocking voltage, alarm voltage.- All MCB are equipped with auxiliary contacts.



Remote / Local:- Remote or Local actuation has to be selected with a

separate selector switch on the mimic.- Interposing relays and interface terminals for remote

control.- Control switches on the mimic for local control of the GIS.

Double action prevention for all mechanisms:- This function blocks simultaneous actuations of several

high voltage mechanisms in one bay. Separate relays are used for double action prevention.



Interlocking & Interlocking Bypass:- Electrical interlocking system complete with feeder- and switchgear interlocking.- Contact logic based on contact multiplying relays, fail

save. Permanent supervision for discrepancy-position of the multiplying relays.- The interlocking voltage is separated from the control voltage.- The interlocking is effective under local and remote

control.- Possibility (by a key switch) to override the interlocking of the relevant bay. Only possible under local control.



Human Machine Interface (HMI):- Selector switches

(Remote/Local, Interlocking Bypass), control

switches (OFF/ON) and position indicators are mounted on a

mimic (mosaik or alu-late) forlocal control.



Control of Disconnectors & Earthing switches:- For local or remote actuation. Local/remote operating selection. - Interposing relays for remote control.- Position monitoring of the mechanisms by indicators on the mimic.

- Intermediate position blocks the operation after running time is exceeded.- A started operation of a mechanism can not be cancelled.- A tipping of a motor relay by hand does not result in a maintaining

position of the relays.- Actuation by control pulse.- Free auxiliary contacts from the mechanisms are wired to terminals.



Example for ON / OFF control of DS & ES:

Control switch

Conductors &Relays



Control of Circuit Breakers:- Local and remote actuation. Local/remote operating

selection. - Interposing relays for remote control. - Trip coils wired on interface terminals for external trip-

signals.- Blocking of tripping and closing in response to SF6 gas loss

second stage.- Anti-pumping circuit.- Blocking of closing if a disconnector or an earthing switch is

ina fault position.

- Supervision of phase discrepancy of the circuit breaker poles.

- Actuation by control pulse.- Free auxiliary contacts from the mechanism are wired to

terminals.



Supervision of SF6-Gas Compartments:- Three phases are connected in parallel on the plant

and one cable is connected to the LCC where a first and a second stage signal of the gas pressure is available.

- For the circuit breaker a relay is wired to the second stage to block the circuit breaker in case of pressure loss.

Cables for looping the three densimeters on the bay

Cable from the bay to the LCC



Alarm Indication & Signalisation:- Alarm unit equipped with 16 alarms.- Fault indication is done with LED. For remote indication

potential free contacts are wired to terminals.- If a fault occures the relevant LED starts flashing as long

as the alarm is acknowledged. Thereafter the LED turns to permanent light. After the fault is cleared it will reset

automatically.



Transformers & Measuring:- Wired to terminals in the LCC as interface to metering

panels and protection panels when the metering and the

protection devices are not installed in the LCC.- Wired directly from the GIS to metering panels and

protection panels.- Display on the LCC with ammeters & voltmeters.



Interface Terminals:

- Each mechanism is connected to a separate terminal block

with screw-type terminals.

- The interface terminals are arranged in modular system.

- Maximum wire connections of 4mm2 (12 AWG) for control and

10mm2 (8 AWG) for incomming voltage supply cables andtransformer cables.

Cabling between GIS and Local control cubicle:



Cables:

- Shielded secondary cables (EMC), for indoor.

- Copper conductors, black wires with numbers inprinted.

- All cables with flexible cores (flexibility class 5).

- All cables are halogen free and fire retardant.

- Control cables 33x1.5mm2

- Densimeter cables 4x1.5mm2 or 6x1.5mm2

- Transformer cables CT 4x4mm2, VT 4x2.5mm2

EMC (electromagnetic compabitility)




Cable connections:

- All cables are equipped with a EMC plug to connect themechanisms to the local control cubicle.

- All cable glands used for the GIS and LCC are EMC glands.


EMC plug on the GIS site

EMC cable gland



Example for cable connection:

GIS bayLCC

EMC plugs

Screw type terminals

EMC cable



Special EMC false floor in the local control cubicle:

- The false floor is equipped with several alu-plates to ensure the EMC.

- The alu-plates are equipped with cable glands for the secondary cable to the GIS bay.


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GIS B65Local control type ESC

Local control with protection, electronic switchgear control

and emergency manual control

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Local control with protection, electronic switchgear control and emergency manual control

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• Two local control cubicles mounted directly on the bays with bay control

• Switchgear control with master and busbar sectionalising control

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Local control for busbar with protection, emergency manual control and electronic switchgear control (master)

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B65_Teil3_Steuerung_e_11_2004