Hangzhou Weshare Import &Export Co.,Ltd.

 

Electric motor insulation made from plant fibers has been widely used. Its advantages are summarized as follows: low cost; high mechanical strength and good bending performance, uniform thickness and wide size range, the insulating paper produced by our company has good chemical stability and long life, It can withstand short-term high temperatures, has good electrical properties after drying, is environmentally friendly and can be reused.

 

 

 

 

 

 

 

 

Insulation Paper with Excellent packaged in wooden crates, wooden framed cases or other strong enough materials covered with moisture-proof materialoutside.

Gross weight of each package not exceeds 3000kgs.

- We have vertical setup,so we can ensure price, quality and leadtime.
- We are manufacturing vendor and we invest 12% profit into R&D.
- We can make Time and Action Calendar 1 day after PO.
- We can give out CAP with 12 hours.
- We supply wide range of transformer components and insulation materials.
- We have a team with 20 years of experience to serve our customers.

 

 

 

 

 

How do we generally consider the arrangement of the transformer neutral point grounding method?

The arrangement of the transformer neutral point grounding method should try to keep the zero sequence impedance of the substation unchanged. When encountering a special operating mode in which the zero-sequence impedance of the substation changes significantly due to transformer maintenance or other reasons, temporary handling should be carried out according to regulations or actual conditions.

1. If there is only one transformer in the substation, the neutral point should be directly grounded. When calculating the normal protection setting, only the normal operation mode of the transformer neutral point being grounded can be considered. When the transformer is inspected, special operation methods can be implemented, such as changing the setting value or deactivating and activating the relevant protection sections as required.

2. When substituting two or more transformers, only one transformer should be operated with its neutral point directly grounded. When the transformer is out of operation, the other transformer with an ungrounded neutral point should be changed to directly grounded. If for some reason, the substation must have two transformers with directly grounded neutral points for normal operation. When one of the transformers with directly grounded neutral points is out of service, if there is a third transformer, change the third transformer to The neutral point directly connected to the ground. Otherwise, handle it in special operation mode.

3. When a substation operating with double busbars has three or more transformers, the neutral points of the two transformers should be directly grounded, and they should be connected to different buses. When one of the neutral points is directly grounded, the transformer stops. During operation, connect another transformer with an ungrounded neutral point to the ground directly. If it is impossible to maintain a grounding point on different buses, it will be treated as a special operation mode.

4. To improve the protection cooperation relationship, when a short line is out of service for maintenance, the number of neutral point grounding transformers can be increased to offset the impact of the line outage on the zero-sequence current distribution relationship.

5. The neutral point of autotransformers and transformers with insulation requirements must be directly grounded.

What is internal overvoltage?

Internal overvoltage is a sudden change in the state of the system due to operation, accidents or other reasons, which will lead to a transition process from one stable state to another. During this process, there may be dangerous overvoltage to the system. These overvoltages are caused by the oscillation and accumulation of electromagnetic energy in the system, so they are called internal overvoltages.

What is the function of the upper voltage equalizing ring of the 220kV valve type arrester?

After installing a voltage equalizing ring, the voltage distribution of the arrester can be evenly distributed.

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