Gas protection is the main protection component of transformer internal faults. It can sensitively operate faults such as transformer turn-to-turn and inter-layer short circuit, core fault, casing internal fault, internal winding disconnection and insulation degradation and oil level drop. The definition of gas protection is the main protection component of the internal fault of the transformer. It can sensitively operate the faults such as transformer turn-to-turn and inter-layer short circuit, core failure, internal casing failure, internal winding disconnection and insulation degradation and oil level drop. When the internal fault of the oil-immersed transformer occurs, the arc will cause the insulation material to decompose and generate a large amount of gas, which flows from the fuel tank to the oil sump. The intensity varies depending on the severity of the fault, and the air flow and the oil flow are reacted. The protection of the action is called gas protection, also called gas protection. Overview Polyurethane Sealing Ring,Plastic Seal,Various seals,Oil Seal ZXS SEALING PRODUCTS FACTORY , https://www.zxs-seal.com
In the gas protection relay, the upper part is a sealed float and the lower part is a metal baffle, both of which are fitted with sealed mercury contacts. The pontoons and baffles can be rotated about their respective axes. In normal operation, the relay is filled with oil, the float is immersed in the oil, in the floating position, the mercury joint is broken; the baffle hangs due to its own weight, and the mercury joint is also broken. When a slight fault occurs inside the transformer, the gas is generated at a slower speed. When the gas rises to the oil conservator, it first accumulates in the upper space of the gas relay, causing the oil surface to fall, and the float is lowered to close the mercury joint. Signal, this is the so-called "light gas"; when a serious fault occurs inside the transformer, it generates a strong gas gas, the pressure in the fuel tank suddenly increases suddenly, causing a large oil flow to the oil pillow direction, because the oil flow impacts the baffle The baffle overcomes the resistance of the spring, drives the magnet to move toward the reed contact, closes the mercury contact, turns on the trip circuit, and trips the circuit breaker. This is called “heavy gasâ€. Heavy gas action, immediately cut off all power supplies connected to the transformer, thus avoiding accidents and expanding the role of the transformer.
Gas relays are available in different types such as float type, baffle type, and open cup type. At present, most of the QJ-80 relays are used, the signal circuit is connected to the open cup, and the trip circuit is connected to the lower baffle. The so-called gas protection signal action means that the signal circuit contacts of the upper open cup in the relay are closed due to various reasons, and the light plate light is on.
Scope of protection Gas protection is the primary protection of the transformer and it reflects all faults in the tank. Including: multi-phase short circuit in the fuel tank, short circuit between winding turns, short circuit between winding and iron core or with outer casing, core failure, oil level drop or oil leakage, poor contact of tap changer or poor wire welding. Gas protection is fast, sensitive, and simple. However, it does not reflect the failure of the external circuit of the tank (such as the lead-out line), so it cannot be used as the only protection device to protect the internal fault of the transformer. In addition, gas protection is also prone to malfunctions due to interference from external factors such as earthquakes.
The gas relay of the transformer on-load tap changer has the same function as the main change gas relay, and the installation position is different, and the models are different.
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UN type Seals are one-way acting Sealing elements, in hydraulic cylinders, mainly used for piston rod sealing, in many applications, especially in mobile machinery, automobiles, forestry and mining machinery, under harsh working conditions , has good mechanical properties. In heavy-duty occasions, it has a very good effect when used in conjunction with the RS-type step Seal.
advantage
In addition to the advantages mentioned above, as well as the advantages of good sealing effect and easy installation, the Sealing Element also has the advantage of low friction in the low pressure range.
Scope of application
It is suitable for piston rod sealing and has a wide range of applications, especially in hydraulic equipment such as mobile machinery, automobiles, forestry and mining machinery.
Technical parameter
Pressure: ≤32 Mpa, when the pressure is higher than 20MPa, it is recommended to use a retaining ring.
Temperature: -30℃ ~ +80℃
Speed: Reciprocating ≤0.8m/s
Medium: Petroleum-based hydraulic oil, emulsion, not suitable for environmentally safe hydraulic oil (bio-oil)
Material
High-performance imported polyurethane (TPU), Shore hardness (SHA) 93°
Installation requirements
In order to ensure that the seal is not damaged during the installation process, it must be installed in strict accordance with the installation requirements of the seal.
Order example
Piston rod diameter: d=50.0mm
Ordering model: UN 50 65 10