Setting knowledge of hydraulic gas protection

1. What is light gas protection?

Generally, the value of light gas action value is expressed by the gas capacity, and the gas volume range of common light gas protection is 20 -300cm 3; the adjustment of gas capacity can be realized by changing the length of the force arm of the heavy hammer.

2. What is the setting of heavy gas protection?

The magnitude of the action value of the heavy gas protection is expressed by the oil flow velocity. The requirements of oil flow are generally as follows: self cooling transformer is 0.8-1.0m/s, strong oil circulating transformer is 1.0-1.2m/s, and transformer 120MVA above 1.2-1.3m/s.

3. Advantages and disadvantages of gas protection

The main advantage of gas protection is that the structure is simple and can reflect all kinds of faults in transformer oil tank. Especially when the interturn short circuit is short and the number of turns is short, the current of the fault circuit is very large, which may cause serious local overheating, but the change of the current reflected in the external circuit is very small, and even the differential protection with high sensitivity may not act.

Therefore, gas protection is very important to reflect this kind of fault. In addition, gas protection is the sole protection of iron core burning. Gas protection is widely used because of its simplicity, sensitivity and economy, and gas protection should be installed for oil immersed transformers over 800KVA and above and 400KVA and above indoor oil immersed transformers.

The main disadvantage of gas protection is that it can not reflect the fault of transformer bushing and lead out line. Therefore, gas protection can not be used as the only main transformer protection, and it is combined with differential protection as the main transformer protection.

Our company operates hydraulic pump components and related accessories, quality assurance, affordable, fortunately, a full range of products, waiting for your presence.