Isolating switch

Isolating switch must be three-pole type, set in a distributive device, serving for an isolation switch from a transformer, tires and PLC. Isolating switch must be managed an electric engine and must be supplied hand control unit for the use in emergency cases.

Isolating switch on the side of tire must have next possibilities of disconnecting:

- ability of breaking of chains between the tires of GIS;

- ability of breaking of capacity current of tires of GIS.

Contact coverage must be projected so that to prevent restrikes and high local loadings, caused transitional evocative tension in case of setting off foregoing currents.

The working mechanism of isolating switch must be supplied all by necessary connections, clamps, connections, push rod, supporting brackets and ground`s. All bearings must be smeared or must be such type, that greasing or service was not required.

Including and disconnecting of isolating switch must be executed either at the place or remotely.

Isolating Switch must be electric blocked the proper switch so that a management Isolating Switch was impossible, if a switch is included.

Activating of emergency hand management must block an electric management.

Isolating switch and contiguous service ground knives must have the electric blocking,

Isolating switch must be supplied a device with a lock for locking in the included, power-off position.

Every switch must have the expressly determined mechanical indicator of position, together with the remote indicator of position on the closet of management of module cell.

Isolating switch with joinings high-speed ground knives must be blocked so that high-speed contactor was included the first, to discharge the charge current of line.

Every contactor must be supplied 4 normally opened and 4 by the normally closed auxiliary contacts, besides those which are used for the aims of blocking of distributive device.

GROUNDED KNIVES

Projects the given for isolating switch, combined with official grounded knives, it admits for application on 145 kV.

Grounded knives must be three-pole, with a group management. Grounded knives must be managed an electric engine and must be supplied hand control unit for the use in emergency cases.

In order that to provide the test of equipment, certain grounded knives must be isolated from a shell and to have the easily taken off ground connection.

Every ground knife must be electric blocked with proper isolating switch and switch so that he could be included, only if a switch and isolating switch power-offs.

An ground knife must be managed remotely or locally from the closet of management of module cell.

Every ground knife must have the expressly determined local mechanical indicator of position, together with the remote indicator of position on the closet of management of module cell.

Every ground knife must be supplied 4 normally opened and 4 by the normally closed auxiliary switches, necessary for using for the local blocking and indication of position.

A lock must be foreseen for locking of ground knife in broken a secret or in the included position.

HIGH-SPEED GROUNDED KNIVES

Grounded knives, located on tires at the beginning VL, must be high-speed type and must be used for the digit of the proper charge currents, in adding to their function of grounding.

Every group of three-pole high-speed grounded knives must have one electric engine. There must be possibility of hand management in emergency cases.

A management a high-speed ground knife must executed locally from the closet of management of module cell or remotely.

Grounded knives must be electric blocked the proper switch, so that grounded knives could not be included, if a switch is included.

To disperse charges at the conclusion of line in repair, it is necessary that grounded knives were included before disconnecting of insulating switch.

Blocking must be well-to-do so that activating of hand control units blocked the electric chain of management.

Every high-speed knife must be supplied 4 normally opened and 4 by the normally closed switches, necessary for using for local blocking and for the aims of indication of position.

A lock must be foreseen for locking of grouned knife in the broken a secret, or included position.

TRANSFORMERS OF CURRENT

The transformers of current, computer-integrated in GIS, must be used for RP and measuring and must be ring-type, external setting. Transformers of current must be multiple-windings with a multicoefficient which it is possible to change through taking on the second puttee. The second conclusions must be shown out in the second distributive box.

The transformers of current must correspond the last standards of IEC.

Basic values must correspond such as in the «Technical requirements».

TRANSFORMERS OF TENSION

The transformers of tension must be disposed how it is indicated on an unilinear chart and must be used for defence, measurings and synchronization.

Basic values must be such as in the «Technical requirements».

Transformers of tension must be inductive type and must effectively protected from electromagnetic high-frequency jumps.

The transformers of tension must correspond the last standards of IEC.

Measures must be accepted for protecting of transformers of tension from shorting and overloads.

The transformers of tension must be equipped hand insulating switch with possibility of disconnecting from a basic chain at service and tests of SS.