GW9 Outdoor High Voltage Isolating Switch

The 33 kv isolator with earth switch is a key component of the electrical system in power plants and substations, functioning as an essential outdoor high voltage isolating switch for safe maintenance operations. This high-voltage isolating switch must be used in conjunction with high-voltage circuit breakers, and its main role is to ensure the safety of high-voltage electrical appliances and devices during maintenance work by providing a reliable isolation of voltage.

Unlike circuit breakers, a 33 kv isolator cannot be used to cut off or input load current or break short-circuit current; it is intended only for specific switching operations that do not generate a strong arc and therefore does not have an arc-extinguishing function. Depending on the installation location, it is available in indoor and outdoor types, while according to the number of insulation pillars, it can be divided into single-column, double-column, and three-column designs, with optional equipment for each voltage level. Utilities often deploy the 33 kv isolator with earth switch together with a standard 33 kv isolator to enhance system safety and flexibility, making the 33 kv isolator with earth switch an indispensable device in modern high-voltage networks.

1. After opening, establish a reliable insulation gap, and separate the equipment or lines that need to be overhauled from the power supply with an obvious disconnection point to ensure the safety of inspection and maintenance personnel and equipment.

2. Change the line according to operational needs.

3. It can be used to divide and combine small currents in the circuit, such as the charging current of bushings, busbars, connectors, short cables, the capacitance current of the switch voltage equalizing capacitor, the circulating current when the double busbar is switched, and the excitation current of the voltage transformer etc.

4.According to the specific conditions of different structure types, it can be used to divide and combine the no-load excitation current of a certain capacity transformer.

1. The altitude does not exceed 1000m,

2. The ambient air temperature: Maximum +40; Minimum: General Area -30, Paramos -40;

3. The wind pressure does not exceed 700Pa.

4. The earthquake intensity does not exceed 8 degrees

5. The working situation is without frequent violent vibration;

6. The installation site of ordinary type isolator should be kept away from gas, smoke chemical deposition, salt-spray fog, dust and other explosive and corrosive matters that affect seriously insulation and conduction capability of the isolator.

7. Pollution-proof type isolator is applies to severe filthy conduction area, however, it shouldn't be any explosive matters and matters causing fire.

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