The signal input terminal of the power quality online detection device shall be fixedly connected and pressed with screws. The current signal is usually selected by the loop series method. Of course, if the number of current channels is small, the current clamp input can also be used. Condition: The current clamp has a compact volume, and the circuit has a clamped orientation and can be fixed.
Some power quality analyzers have the following signal inputs :
1) In order to detect the neutral voltage, current signal, the voltage of the analyzer, and the current channel are composed of four groups of ABCN , the detection has important help effect on the deep analysis of the effect power quality policy and the compensation and correction measures. It is claimed that the power quality analyzer should have an N- phase signal detection function.
2) Some power quality monitors have multiple sets of three channels, which can detect multiple line currents of multiple bus voltages together. It is advocated that such a signal input method is not selected, and the effect of the analyzer is to perform detailed analysis and accounting of power quality standards.
The signal input of the power quality analyzer, the direct input of the voltage signal, and the current clamp of the current signal. Because it is used for temporary testing, the instrument is required to be highly versatile.
3 ) Regarding the signal input of the waveform recorder, it is usually equipped with a separate external blocking amplifier as the front of the signal input.
4 ) The signal input voltage signal of the harmonic analyzer should be directly connected, and the current signal should be current clamp. Because it is used for temporary testing, the instrument is required to be highly versatile.
5 ) The channels are blocked from each other to prevent the influence between the channels.
6 ) The input impedance of each loop signal should be satisfactory for the load demand of the access loop. 10 times extra current input, the acceptance time is not less than 5 seconds
7) Signal loop Under the additional input voltage and current parameters, the apparent power consumed by the loop should be no more than 0.5VA/ loop.
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