27.5 kV AC switchgears
27.5 kV AC switchgears provide reliability and continuity of power supply, operational safety and ease of maintenance. 27.5 kV AC switchgears are developed, manufactured, tested in accordance with high requirements of international standards IEC 62271-1 and IEC 62271-200.
Key features:
- ergonomic industrial design;
- easy access to all functional groups of equipment;
- possibility of switchgear built-in equipment manual control when compartments doors are closed;
- single sided maintenance;
- vacuum circuit breaker is installed on trolley;
- sliding shutter for maintenance safety.
Main advantages:
- protection against accidental touch to live parts;
- maintenance safety due to shutter mechanism and interlocking system, which exclude false personnel operation;
- resistance to internal arc;
- application of control and protection microprocessor units of leading world manufacturers, corresponding ANSI and IEC standards.
Application areas:
27.5 kV AC switchgears are provided for reception and distribution of AC electric energy of 50 Hz power frequency at railway traction substations.
Indoor vacuum circuit-breakers are designed for 27,5 kV rated voltage and 1250 A rated current. Circuit-breakers require little maintenance. It is recommended to make visual inspection and periodic cleaning of insulation parts, and greasing of drive mechanism.
It is possible to control circuit-breaker manually by pushing buttons, or electrically (release mechanism). Actuator’s drive reloads energy storage mechanism of coil spring after tripping. In addition to release mechanisms switching module also includes interlocks. Last switching operation is always switching off.
High quality vacuum tube is placed into a molded housing made of insulating material:
- vacuum tube is protected against extreme environmental conditions and damage;
- circuit-breaker pole can be dismantled as one unit.
Control and relay protection microprocessor units of leading world manufacturers provide control and protection functions in 27,5 kV AC switchgears.
Control and relay protection units provide selective protection of contact network.
A user-friendly control interface and several communication ports allow easy protection unit configuration and control, as well as complete data acquisition.
Control and relay protection units include several integrated data communication protocols (IEC 60870-5, MODBUS, DNP3) and communication via RS-485, Ethernet interfaces, which provide simple connection to any substation control system.
Main types of protection:
- definite time, inverse definite minimum time overcurrent protection;
- catenary overvoltage/undervoltage protection;
- distance time protection.
|
Type |
Application |
| Incoming Cubicle | for transformer winding connection with 27.5 kV AC switchgear busbars |
| Power Line Connection Cubicle | for power line connection to 27.5 kV AC switchgear busbars |
| Feeder Cubicle | for traction network feeding line connection with 27.5 kV AC switchgear main busbar |
| Voltage Transformer Cubicle | includes instrument voltage transformers providing 27.5 kV AC switchgear busbars voltage monitoring |
| Section Switch Cubicle | for busbars sections interconnection at traction substations |
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