Earthing Switch

Timetric Earthing Switch  Introduction

High voltage Earthing Switch is an important switching appliance in power plant and substation electrical system, which needs to be used together with high voltage circuit breaker. The isolation switch is suitable for indoor devices with three-phase AC 50Hz and rated voltage 12KV. For switching on, off, or switching lines of high-voltage equipment under load and voltage. Its main function is: to ensure the safety of high-voltage electrical appliances and devices in maintenance work, play the role of isolating voltage, can not be used and cut off, input load current and short-circuit current, only can be used for some switching operations without strong arc, that is to say it does not have arc extinguishing function; Divided by installation location, indoor and outdoor, according to the number of insulating pillars, single pillar, double pillar and three pillar, optional equipment for each voltage level.

Timetric Earthing Switch Technical performance

Isolation switch has no arc extinguishing device, can not be operated with load.

For the 10KV isolation switch, under normal conditions, it allows the range of operation is:

1, divided, combined voltage transformer and lightning arrester.

2. Divide and close the charging current of the bus bar.

3, divided, combined excitation current does not exceed 2A no-load transformer and capacitor current does not exceed 5A no-load line.

The old transformers in the 1950s and 1960s had large no-load ammeter, so it was stipulated at that time that the outdoor type isolation switch could only switch off the no-load current of the transformer below 560KVA, while the indoor type isolation switch could only switch off the no-load current of the transformer below 320KVA due to the small interphase distance. Later S7 series and S9 series of transformer no-load current than the old transformer has a significant decline, but no new regulations on the isolation switch operation transformer no-load capacity put forward a clear limit range, so it can be considered by no more than 2A; As for the capacitive current of 5A, the specific reference is as follows: the outdoor isolation switch can be divided into the no-load current of the overhead line whose length does not exceed 10KM. For no-load cable line, its capacitance current is much larger than that of overhead line with the same length, and is affected by the number of cores and section of the cable, so it is difficult to use a length to limit.

Timetric Earthing Switch Environmental conditions

1. Altitude: no more than 1000m;

2. Ambient air temperature: -30 +40;

3. Relative humidity of the surrounding environment: the daily average is not more than 95%;

4. The monthly average is no more than 90%. Earthquake intensity is not more than 8 magnitude;

5. Safe place: no fire, inflammable, explosive, serious pollution, chemical corrosion and violent vibration place.

Timetric Earthing Switch  Details