Yhptx third harmonic suppresso

  1、 In China's power system, especially in the distribution network below 35KV, there are a large number of electromagnetic voltage transformers
Electromagnetic voltage transformers have nonlinear electromagnetic characteristics
When they match with the capacitive elements in the power grid, ferromagnetic resonance will occur, resulting in extremely high ferromagnetic resonance overvoltage
In case of overvoltage, the excitation current of the transformer is greatly increased due to the saturation of the iron core of the transformer, which is more than 100 times of the normal excitation current in serious cases, resulting in the fusing, oil injection, burning and even explosion of the fuse of the voltage transformer, which seriously threatens the safe operation of the power grid

  At present, the primary harmonic eliminator is connected to the primary neutral point of the voltage transformer in the power grid to limit the ferromagnetic resonance overvoltage
However, it is often found that the PT secondary voltage imbalance occurs after the installation of the primary harmonic eliminator, and the secondary voltage imbalance basically disappears after the removal of the primary harmonic eliminator
Through detailed field measurement, calculation and analysis, it is found that the root cause of this phenomenon is the third harmonic in the power grid
Through the inductive reactance formula of the transformer (XL = 2 & PI; F), we can know that the higher the frequency, the greater the impedance of the transformer, so the greater the inductive reactance difference of the three transformers, When the third harmonic current flows through the excitation winding of the transformer and the primary harmonic eliminator, due to the different impedance, the neutral point displacement voltage is generated, resulting in the three-phase voltage imbalance

  In order to solve the above problems, Anhui Yahui Electric Automation Co
, Ltd
has developed the patented yhptx voltage transformer third harmonic suppressor after years of research
The suppressor adopts the high computing speed CPU of American Weixing company as the core processing element, combined with modern power electronic control technology, which can effectively suppress the influence of the third harmonic current on the voltage transformer, Solve the problem of three-phase voltage imbalance after the primary harmonic eliminator is installed on the voltage transformer

2、 Rated parameters
2
1 working environment conditions
Ambient temperature: - 40 ~ + 65 ℃
Altitude: less than 5000m
Seismic intensity: less than 8 degrees
Relative humidity: no more than 95%, no condensation
Atmospheric pressure: 80 ~ 110kpa
Other conditions: the air around the device shall not contain acid, alkali corrosion or explosive substances, and lightning protection, rain and snow facilities shall be provided
  2
2 rated electrical parameters
Working power supply: built-in (low-power design, service life greater than 20 years)
Rated input voltage: 100V
Frequency: less than or equal to 150Hz
2
3 overload capacity
  1
2 times of rated input voltage can work for a long time
1
5 times the rated input voltage, allowing 2 hours