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How to protect the dry-type test transformer?

time:2020/11/7   source:华天电力  reading:221 time

1. Gas protection


Gas protection refers to a protection that causes the protected transformer to trip directly when the dry-type test transformer has an internal short circuit (including inter-turn short circuit), but the short-circuit current does not reach the current protection setting. It belongs to the main protection of dry-type test transformers and cannot be removed during normal operation. Transformers are classified into light and heavy conditions according to the operating pressure of the Buchholz relay. Heavy gas acts on tripping, and light gas can act on tripping or signals according to the situation.


Hipot Test Set (Dry Type).png


2. Temperature protection


That is, the temperature of the winding is measured by the temperature controller, and the over-temperature alarm and over-temperature trip signals are issued according to the preset settings. The dry-type test transformer is generally equipped with two levels of temperature protection: low temperature alarm and high temperature trip. The specific temperature value can be set Follow the instructions of the transformer manufacturer.


3. Indoor protection of dry-type test transformers


We need to prevent small animals such as rats and snakes from entering. Generally, these animals entering the transformer will cause a short circuit and even higher danger. So we can use IP20 protective protective shell for protection.


4. Outdoor protection of dry-type test transformer


The main purpose is to prevent the entry of rainwater. In the case of the protective case, we also need to adjust the angle of the transformer to prevent water from entering. But now there are professional outdoor protective enclosures. In the specific protection work, we have to make judgments based on different environments, and we should try to avoid harsh environments to avoid reducing the performance of the transformer.


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