One harmonic elimination test method

One harmonic elimination test method

In the case of 6 to 35kV transmission and transformer stations where the neutral point of the power grid is not grounded, the PT primary winding on the bus will become the only metal channel of the neutral point ungrounded power grid to the ground. The charge and discharge of the capacitor on the opposite side of the power grid must pass through the PT. The primary winding makes the core deeply saturated. Therefore, when grounding power disappears, inrush amperage will appear in the PT primary winding, the PT value = "5." Hasspace = "False" negative = "False" numbertype = "1" tcsc = "0" w: St="on"> The 0.5A fuse is blown and a harmonic eliminator can effectively limit the inrush current of the PT primary winding.   In the case of no bus no-load or out-of-line, ferromagnetic resonance overvoltage may be generated, resulting in unstable phase voltage, occurrence of grounding indication malfunction, and PT high-voltage fuse being blown. The use of LXQ II series harmonic eliminators will greatly reduce this situation. The AC parameters are used to characterize the electrical parameters of a harmonic eliminator. The parameters at 0.3mA ( peak ) power frequency reflect the voltage on the harmonic elimination device in the normal operation of the power grid; the parameters at the power frequency 3mA ( peak ) reflect the voltage on the harmonic eliminator under single-phase grounding of the power grid. AC current is easy to obtain, allowing users to retest.  

The LXQ-10 Harmonic Resonator has adopted a step-by-step variable parameter measure to provide a voltage control unit ( discharge tube ) so that in the normal operating current segment of a harmonic eliminator, the original volt-ampere characteristic is still maintained, thereby effectively limiting The voltage across the harmonic eliminator limits the voltage below the insulation withstand rating of the weakly insulated PT , thereby effectively protecting the neutral point insulation.

Testing method

Volt-ampere characteristic test   Measure the volt-ampere characteristic of the resonance eliminator with the peak milliammeter (or peak voltmeter).

Flow test   Use the above method to increase the current to 250 mA to 300 mA . After 10 minutes of flow , make the resonance device heated to value="100" hasspace="False" negative="False" numbertype="1" tcsc="0" w:st="on"> 100 °C ~ value "300" hasspace="False" negative="False" numbertype="1" tcsc="0" w:st="on"> 300 °C , then cold water Spraying should be without any damage.   Note: This test will produce smoke at 4 to 5 minutes due to temperature increase. This is normal and will not damage a harmonic eliminator.