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一次消谐阻尼器,如LxQ型阻尼器,实际上是将一个非线性消谐电阻R。串接于电压互感器一次侧中性点与地之间,它采用中性点阻尼电阻消除谐振。电网正常运行时,消谐器上电压<500V。呈高电阻值(可达几百k欧),阻尼作用大,使谐振在起始阶段不易发展;当电网发生单相接地时,消谐器上电压较高(10kV电网中其值约1.7一1.8kV),R0呈低值(几十k欧),可满足TV开口三角电压不小于80V的绝缘监测要求,而且仍可阻尼谐振;当电网发生弧光接地时,R0仍能保持一定的阻值,限制互感器涌流。
The primary harmonic elimination damper, such as LxQ damper, is actually a non-linear harmonic elimination resistance R. It is connected in series between the neutral point of the primary side of the voltage transformer and the ground. It uses the neutral point damping resistance to eliminate the resonance. When the power grid is in normal operation, the voltage on the harmonic eliminator is less than 500V. It has high resistance (up to several hundred kOhms), large damping effect, which makes resonance difficult to develop inxuzhisu.07858.net shilayou.07858.net fangtingyou.07858.netdaoreyou.07858.nethaerbin.89ix.comhuhehaote.89ix.com the initial stage; when single-phase grounding occurs in power grid, the upper voltage of harmonic eliminator is higher (about 1.7-1.8 kV in 10kV power grid), and R0 is low (tens of kOhms), which can meet the insulation monitoring requirements of TV open triangle voltage not less than 80V, and still can damp resonance; when arc grounding occurs in power grid, R0 can maintain a certain resistance. Value, limit the inrush current of transformer.