Precautions for on-site installation and replacement of zinc oxide arrester manufacturers

1. Technical requirements for the neutral point lightning arrester of the main transformer winding

1. For 220KV transformer: 220KV winding neutral point should use Y5W?—108/281 type zinc oxide arrester, parallel gap should be 300mm; 110KV winding neutral point should use Y1.5W?—60/144 type zinc oxide arrester , The parallel gap is 140mm.

2. For the 110KV transformer: the neutral point insulation level is 60KV (LI325 AC140), the Y1.5W—60/144 type zinc oxide arrester is connected in parallel with the horizontal gap of 140mm distance; the neutral point insulation level is 44KV ( The selection of LI250 AC95) Y1.5W—60/144 zinc oxide arrester is connected in parallel with a 120mm distance horizontal gap; the neutral point insulation level is 35KV (LI185 AC85) and can be protected by a 115mm distance separate horizontal gap. The bar gap should be made of φ16mm galvanized round steel, the shape of the end is close to semicircle without edges and corners, the end has threads for adjustment, and the gap should be arranged horizontally to prevent rain from shorting.

2. Technical requirements for main transformer outlet arresters

1. The outlet lightning arrester with voltage level of 35KV and above should be the product with the same rated voltage as the busbar arrester (in principle, the same model).

2. For the 10KV bus bridge arrester of 220KV transformer, 3 arresters should be installed and 3 discharge counters should be added. For the 10KV busbar bridge arrester of 110KV transformer, one arrester should be installed in phase B and a discharge counter should be added.

3. The specific requirements of the arrester in the 10-35KV switch cabinet

1. Remove all RC type RC (lightning arrester) absorption devices in the capacitor cabinet.

2. Except for the busbar PT bay arrester, the arresters in other switch cabinets should be removed immediately. The lightning arrester in the capacitor switch cabinet should be placed outdoors, and the installation location is generally selected between the outdoor cable outlet and the capacitor; after the lightning arrester in the outlet switch cabinet is removed, for the cable outlet, the installation location is generally selected at the cable outlet end of the tower. For the overhead line, the installation location is generally selected at the lower end of the wall bushing outside the wall of the power distribution room. The responsible unit must prepare the corresponding materials and maintenance tools in advance before carrying out this transformation.

3. It is forbidden to use zinc oxide arresters in series gaps for the protection of capacitor banks.

4. It is forbidden to use the four-surge arrester wiring method (three branches connected to the star, one connected to the neutral point).

4. Technical requirements for online detector

1. In principle, the zinc oxide arresters that will be replaced in the future will use the on-line detector provided by the original factory.

2. For the price of zinc oxide arrester that is not equipped with an online detector, the principle of using an additional online detector is as follows: 110KV and above: JCQ-3B or JSH-3B 110KV neutral point, 35KV and below: JCQ-3C or JSH- 3B

3. After the same group of online detection is damaged, stop the motor and replace the monitor of the same manufacturer and model. Try to achieve the same model of the same group and the same station. If not, replace all three phases and use them as spare parts. , To facilitate standardized management.

5. Technical requirements for grounding of arrester manufacturers

The base foundation of all arresters must be double grounded, that is, two grounding down conductors and two points on different sides of the grounding grid are welded.

Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbow connectors, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-shaped heads, wall bushings, European cable accessories, American cable connectors, transformer neutral point protection devices, fuses, isolation switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products