X10 EVOLUTION 17.5 kV AC switchgear

Protection against internal arcing

X10 EVOLUTION cubicles are structurally protected against the damaging effects of internal arc and ensure safety of the operating personnel. Internal arc detector - an electronic module with optical sensors - can be installed as an option in X10 EVOLUTION cibicle. The optical sensors measure intensity of light produced by the arc in X10 EVOLUTION cubicle. After processing data from sensors, the electronic module issues a signal to trip the circuit breaker.

Interlocking

Several additional safety levels are provided for the personnel safety:

• vacuum circuit breaker can only be operated with the compartment door closed;
• a number of mechanical and electrical interlocks prevent service personnel from making mistakes;
• locking interlocks are provided;
• cubicle is controlled from the front panel;
• voltage indicator is installed on the cubicle front side on control and indication compartment door.

Safety

Basic design of the cubicle includes outlets for gas exhaust through pressure relief valves. Each compartment has its own gas outlet.

The cubicle consists of 4 compartments separated by metal walls:

control and indication compartment. PowerLogic P3 protection device (Sepam, MiCOM) (at the Customer's request), monitoring, control, energy metering devices, etc. are located in the compartment;

switchgear compartment. In addition to withdrawable unit with vacuum circuit breaker (trolley with withdrawable disconnector or withdrawable unit of voltage measuring transformers), there are sliding metal curtains, automatically closed when the withdrawable unit is moved from the operating to test position;

power cables compartment. Cable entries, grounding disconnector, high voltage indication system module, current transformers and voltage transformers are located in the compartment;

power and collecting busbars compartment. Copper busbars and bushing insulators are located in the compartment.

EasyPact EXE vacuum circuit breakers are applied in X10 EVOLUTION as switching devices:

• rated voltage 17.5 kV;
• maximum breaking capacity at short circuit up to 31.5 kA;
• rated current: from 630 A to 1250 A;
• axial magnetic field (AMF) technology during tripping;
• withdrawable design.

Special shape of operating contacts in the circuit breaker's vacuum tubes and axial magnetic field during arc extinction ensure "the softest" arc extinction possible for this type of circuit breaker, even at high currents.

EasyPact EXE meets the highest requirements for mechanical wear resistance (IEC 62271-100: class M2).

Earthing disconnector is used to ground and short-circuit cable terminals before starting work in the cable compartment. The earthing disconnector in voltage transformer functional module grounds the switchgear busbar.

Earthing disconnector meets the requirements of IEC 60271-102:2018 standard and includes:

• high speed closing mechanism independent of the operator;
• a device that blocks the disconnector operation when the switchgear compartment is open and the circuit breaker is withdrawn.

Protection, control, and monitoring system ensures performance of the main functions:

• effective protection of equipment and personnel;
• accurate measurements and detailed diagnostics;
• control of power switchgear;
• monitoring and displaying the power switchgear status;
• information exchange with a centralized communication network control system.

The system includes:

• voltage transformers;
• Easergy PowerLogic P3, Sepam, MiCOM protection, monitoring and control system;
• zero-sequence current transformer;
• current transformers.