An explosion-proof voltage relief transformer

Abstract

The invention provides an explosion-proof pressure relief transformer, which includes a transformer main body, which is provided with a main oil tank pressure relief interface, a bushing rising seat pressure relief interface and an on-load tap changer pressure relief interface; the above pressure relief interfaces are respectively installed with Anti-arch bursting disc pressure relief device; anti-arched bursting disc pressure relief device includes anti-arched bursting diaphragm, inlet side holder and pressure relief side holder, anti-arched bursting diaphragm is held by the inlet side holder It is clamped and fixed with the pressure relief side clamp. The invention adopts the anti-arched bursting diaphragm, compared with the positive arched diaphragm, there is no diaphragm opening, which prevents micro-leakage and greatly improves the sealing performance; the bursting pressure of the anti-arched diaphragm The value can be closer to the working pressure value, so the long-term reliability is better; and the installation position should be as close as possible to the point of failure, and the tapered pipe joint is used, which reduces the flow resistance loss compared with the straight pipe pressure relief channel. Install one or more pressure relief devices on the pressure relief parts to achieve effective protection.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an explosion-proof voltage relief transformer. Background technique [0002] Oil-immersed transformers contain a large amount of transformer oil, which is prone to explosion hazards in the event of high-energy faults. Therefore, the transformer must be protected against explosion. At present, the main solution to prevent transformer explosion in the world is to install pressure relief valves or positive arched metal burst diaphragms on the transformer body, on-load tap changer and other parts as pressure relief devices for protection. In recent years, many phenomena such as transformer explosions and fires have occurred from the bushing riser. However, in all current technologies, there is no explosion-proof pressure relief protection for the riser. [0003] The latest explosion-proof technology adopts the positive arch bursting diaphragm as the main explosion-proof compon...

AI Technical Summary

Problems solved by technology

The burst pressure is controlled by the weakened structure formed by the slits and holes on the arched surface of the diaphragm. In the burst test and practical application, it is found that when the bursting diaphragm with positive arch slots is impacted by the internal (concave) pressure, only In the case where some connecting bridge sections are broken and the rest of the connecting bridge sections are not broken, the strength of the bursting diaphragm will be greatly reduced, which will bring hidden dangers to the stable operation of the device, and there may be oil leakage, etc. Phenomenon

The front-arch slotted bursting diaphragm adopts the sealing film as the sealing element. Because the thickness of the sealing film is very thin, micropores may be generated due to uneven material and impurities left in the processing process, which will result in airtightness test and high A small amount of leakage occurs during the vacuum test

Images