Product Overview
Summary
The GW5 outdoor disconnecting switch is AC 50 Hz outdoor high-voltage equipment designed for reliable isolation and safety in power systems. Available in rated voltage grades of 40.5 kV, 72.5 kV, 126 kV, and 252 kV, this disconnecting switch can open and close a high-voltage circuit under no-load conditions and perform the electrical isolation of tested high-voltage buses, circuit breakers, or charged high-voltage circuits. It can also make and break small capacitive or inductive currents when required.
For medium-voltage applications, utilities often use an 11 kv isolator with earth switch to provide additional earthing protection during maintenance. In extra-high-voltage networks, a 132kv isolator serves a similar role, ensuring complete disconnection and safety. The disconnecting switch thus remains a critical component across different voltage levels, from the 11 kv isolator with earth switch for local distribution to the 132kv isolator for large transmission systems.
Structure instruction
The isolating switch consists of base, insulating post, conducive part and operating mechanism. Each pole has a pair of V-shaped posts, and at the top of post there are two conducive blades, and the contact of two blades contacts are in the middle of two posts; at the bottom of post, there are bearing sheathes and bevel gear for driving; by the action of operating mechanism, the blade is able to rotate 90°, so as to meet the opening and closing requirements.
The isolating switch is of single-pole type, however, it can be formed into the interlinked three-pale type through connecting the three poles with the connection rod. It is equipped with CS17 type manual operating mechanism, thereinto, CS17D is used for the isolating switch with earthing device. In addition, CJ6 motor mechanism may be equipped according to the needs.
On the basis of the above mentioned structure instruction, it is easy to see that the isolating switch has reasonable structure and flexible operation. Both the single-pole type and three-pole type are available, and it may be installed on side or installed reversely. It is featured with large clearance of open contact blades and reliable insulation. According to customers' needs, it may be provided with the single-side earthing mode or double earthing mode.
Usage environmental conditions
1.Altitude: 1000~3000m;
2.Ambient air temperature: -30℃~+45℃ (No less than - 40℃ in alpine region);
3.Wind pressure does not exceed 700Pa (equal to wind speed 34m/s);
4.Seismic intensity does not exceed 8 degrees;
5.Thickness of ice coating: no more than 10mm;
6.Installation place: free of flammable and explosive objects, chemical corrosion and drastic vibration;
7.Pollution grade of post insulator: common type is Ⅱ grade, anti-pollution type is Ⅲ, Ⅳ.
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