Medium Voltage Switchgears

WITHDRAWABLE UNITS OF MV SWITCHGEARS WITH VACUUM CIRCUIT BREAKERS

Rated voltage:  12 kV
Continuous rated current:  up to 2500 A
Breaking current:  up to 40 kA

APPLICATION

Withdrawable units of switchgears with vacuum circuit breakers for rated voltage 12 kV and continuous rated currents up to 2500 A and breaking currents up to 40 kA have been designed and implemented to production by ELMOR S.A.

Users old types of switchgears for example -type RSW 10, PREM 10, and other are able to make a complete modernisation and improvement of technical quality of circuit breaker cubicles through replacement of worn out withdrawable units with oil-poor circuit breakers by new ones. New units can be equipped with modern circuit breakers of such producers as: ABB, ALSTOM, Schneider (Merlin Gerin), Noell Preussag/ SGM Schaltgeräte, Siemens.

ADVANTAGES

Application of vacuum circuit breakers with much better technical-exploitation features than oil-poor circuit breakers features, especially as it concerns mechanical strength and switching capacity and equipped with spring drives charged by means of a motor gives following effects:

	oil, compressed air and plants connected with these mediums as well, can be eliminated from switchgears,
	safety of service is increased,
	operational reliability is increased,
	range and frequency of surveys , services and maintenance is decreased.

CONSTRUCTION

Technical parameters and equipment of the withdrawable units with vacuum circuit breakers can be adapted to all used till now switchgears for example type RSW10, PREM 10, and other.

Depending on necessity the units can be equipped alternatively with one or two current transformers protected with fuse elements or with three overvoltage limiters. Adjusted fastenings of circuit breakers and of connector contacts between units and of a front plate as well, assure a possibility of precise matching a movable unit to each switchgear.

Low voltage circuits of the circuit breaker and of current transformers are led to a typical plug of a 30-pole contact junction installed in a fixed part. All functions connected with control, protection and signalling are maintained without a necessity of making any changes in low voltage equipment of the switchgear.

How to order:

Order must include:

	rated voltage, rated continuous current and breaking current,
	parameters of a motor and of circuit breaker releases,
	information if the withdrawable unit has to be equipped with current transformers or overvoltage limiters and a counter of re-set cycles.

ACCORDANCE TO NORMS

Withdrawable units comply with following Norms:

	PN-86/E-05155 /IEC 60694/
	PN-88/E-05150 /IEC 60298/
	PN-89/E-06105 /IEC 60056/

Assortment of the proposed withdrawable units *

*) we also realise individual requirements for withdrawable units

**)with ALSTOM HVX circuit breaker

Dimensional drawing of example solution with EVOLIS vacuum circuit breaker 

Medium Voltage Switchgears