Load switch UNAL, load switch WPSA.

Load break switches UNAL, WPSA, interrupter are intended for switching on and off under load plots of the electric circuit of alternating three-phase current 400 and 630 a frequency 50, 60 Hz, rated voltage up to 10 kV, and to provide safe production work on the disconnected area with a stationary earthing. The load switch is installed in the shell complete switchgear and transformer substations (kroon and KTP) internal installation and chambers of stationary one-sided service (CSR). The arc extinguishing is carried out with the gas stream emanating from the walls the arcing chamber when exposed to them will extinguish the arc gases in the atmosphere. Management is a separate wire connected with the load switch mechanical transmission, mounted on the mounting location of the circuit breaker. View actuator: spring, using the potential energy stored in the spring, exciting manually or electrically. The location of the drive VNA can be left-hand drive (FNAL) and right-hand drive (WPSA). Between contacts pole off of the load switch has a gap. Mechanical the resource before the first overhaul of not less than 2000 operations. Life switch the load to the write-off of 25 years. Warranty period - 2 years from the date of commissioning.

 

Specifications:

Name parameters

VNA-10

Nominal voltage nominal voltage, kV

10

Nominal working voltage, under UHP, kV

12

Rated current, And

630

The nominal initial value of the periodic component

through the short circuit current NP, CA:

20

Rated tripping current, And

630

Standard parameters end-to-end short circuit current:

- maximum peak current (current electrodynamic stability), kA;

- start current the value of the periodic component, kA;

- RMS current at the time of its occurrence (current thermal stability), kA;

the time of current flow tкз, S.

 

51

20

20

1

Rated current include:

- highest peak, CA;

- the initial current value of the periodic component, kA.

 

51

20

Switching capacity in normal operational mode, IN

10

cycles