A method for measuring the capacitive current of a 35kv distribution network with a phase-controlled arc suppression coil
An arc suppression coil and capacitive current technology, which is applied in the direction of measuring current/voltage, only measuring current, measuring electrical variables, etc., can solve the problems that affect the normal operation of the phase-controlled arc suppression coil, the measurement error is large, and the measurement cannot be performed. Achieve the effect of high reliability, convenient and accurate measurement
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Embodiment 1
[0036] Refer to attached figure 1 and 2 , the invention discloses a system for measuring the capacitive current of a 35KV distribution network with a phase-controlled arc-suppression coil, including a phase-controlled arc-suppression coil 1, which includes a primary winding and a secondary winding, and the secondary winding includes The control winding 11 and the filter winding 12, the neutral point of the 35KV distribution network system are connected in series with the primary winding and the neutral point single-phase current transformer 5 respectively, the primary winding is grounded through the neutral point, and the single-phase voltage transformer 4 is connected to the phase-controlled Arc coil 1 is connected in parallel;
[0037] The secondary winding is electrically connected to the local control cabinet 2, and the local control cabinet 2 includes a first power bidirectional thyristor and a filter group, the first power bidirectional thyristor is electrically connect...
Embodiment 2
[0041] On the basis of Embodiment 1, the microcomputer controller 3 includes a signal conditioner that is connected with the single-phase voltage transformer 4 and the single-phase current transformer 5 and that the collected signal is conditioned, and is connected with the signal conditioner and simulates the signal. A / D converter for digital conversion, a processor connected with the A / D converter and processing the converted numbers, the processor is connected and performs photoelectric isolation processing on the first bidirectional thyristor and the second bidirectional thyristor action command issued The photoelectric isolator, the two-way thyristor processed by photoelectric isolation acts as an east command to make the first two-way thyristor and the second two-way thyristor act; the processor is also connected with a liquid crystal display and a keyboard operation module.
Embodiment 3
[0043] Refer to attached image 3 and 4 , based on Embodiment 1, a method for measuring the capacitive current of a 35KV distribution network with a phase-controlled arc suppression coil is provided, which specifically includes the following steps:
[0044] Step 1: Measure the asymmetrical voltage of the neutral point of the 35KV distribution network system bd ;
[0045] Step 2: The power frequency voltage signal is injected into the 35KV distribution network system, and the output voltage at this time is measured respectively AX , at this time the output current I z ;
[0046] Step 3: The rated phase voltage of the system is U e , through U bd , U AX , I Z , U e Calculate the capacitance current I of the distribution network system C .
[0047] The calculation method is as follows:
[0048] The corresponding vector relationship of the equivalent circuit of the system is:
[0049] AX = bd + C
[0050] According to the law of cosines, it can be concl...
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