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Automatic machine transformer bushing wear through the core CT polarity measurement

Today Dongguan Hui Yue Technology Engineering Testing the automatic machine transformer bushing wear through the core CT polarity measurement, electrical test, often need to retest the assembled transformer bushing current transformers their polarity, the conventional method is between the transformer outlet and neutral point plus 3V DC, powered moment, in the current transformer secondary side with the pointer multimeter mV range measuring the "DC induction method." However, larger capacity transformer when the sleeve is installed later, the transformer inductance coil has a great use of "DC induction method" can not be measured bushing current transformer polarity (for capacity over 240MVA transformers that use 24V DC voltage measurement does not come out, if it continues to boost the voltage, transformer regulation is not allowed). In our work, the use of the transformer high side A, B, C three-phase short circuit transformer winding up the elimination of the flux synthesis method, in which the neutral point of 1.5V DC voltage applied to determine the polarity of the current transformer. This "action to eliminate inductance measurement" proven, feasible, accurate measurements, to work to bring a great convenience.

2 Principle of three columns with three hearts transformer (analysis of three heart five columns transformer with three hearts three-column transformer is the same) as an example for analysis.

2.1 A-phase coil is powered on when a phase is powered, the moment when the switch K is closed, there is an increasing current flows through the transformer coils generate varying flux linkage ψ, induced electromotive force eL. According to Lenz's law of electromagnetic induction and eL = -dψ / dt, the transformer iron hearts larger air gap, and working in a non-saturation, the inductance can be considered to be linear. Which can get the eL = - (dI / dt). The actual direction of the self-induced emf is always an attempt to stop the current change. The core role of the transformer, inductance greatly enhanced, namely the unit of magnetic flux generated by the current surge in the chain, so that eL higher. From the physical sense, a high voltage must be applied to overcome fi, but in actual field tests is not allowed. Thus, the current flowing through the coil is small, sensitive to the current transformer secondary current is smaller and can not be seen from the measuring meter pointer deflection direction can not correctly judge transformer polarity.

2.2 three-phase coil short circuit is powered, after a three-phase plus neutral point coil short-circuit, three-phase short circuit power on the principle of measuring the polarity of the current transformer wiring diagram, it can make the flux linkage generated by each phase offset each other (leakage Flux is negligible), thereby eliminating the self-induced emf coils, to increase the loop current purposes. Transformer Core Section assume the same everywhere, each with zero leakage flux. Thus, when the closing moments K, A, B, C three-phase current through the coil is equal to the magnetic flux generated by the current chain is equal. Direction of the flux linkage shown, the final performance in each phase flux linkage is 0, it is self-induced emf 0. Therefore, no need to overcome the effects of the applied voltage self-induced emf, the entire circuit can be understood as a purely resistive circuit, I = V / R, R and a shunt resistor and the internal resistance of the power supply and three coils. The size of this current depends only on the power supply potential and the size of the loop resistance, the current value is much larger than the single-phase coil is powered. Due to the increase of the primary current, EMF current transformer secondary will also increase, therefore, from the measuring meter can accurately determine the polarity of the transformer.

Hui Yue Technology Li Gong summarize the method of "action to eliminate inductance measurement polarity" to solve the transformer bushing and transformer body when assembled, measuring transformer casing polar issues. This method is accurate, simple, and "DC induction method" there is no difference from the procedures. Applicable to the neutral point leads to various high-frequency transformer.

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