Transformer OLTC diagnostic system PKR-2M

PKR-2M is intended for demountable diagnostic of OLTC devices of all types (both resistor and reactor), as well as for non-demountable diagnostic, which enables to diagnose OLTCs with current-limiting resistors without removing contactor tank cover.Resistor type OLTC non-demountable diagnostic (DRM method) OLTC non-demountable check (DRM method) enables to conduct express diagnostic of the OLTCs with current-limiting resistors without opening the tank. Based on the results obtained in the DRM mode, there are two graphs built: resistance versus time and conductivity versus time. For example, for OLTC types RS, RNOA, etc., the correctness of operation of the main and arcing contactor contacts, their condition (burned or not burned contact), current-limiting resistor integrity may be determined. For OLTCs of RNTA – 35/320 type and its analogues, in which the contactor and selector are changed for a fine control switching device, the main and arcing contacts, current-limiting resistor condition, as well as condition of surface of all fixed contacts of the circuit breaker, through which the moving contacts move, may be checked. The application of non-demountable check mode based on the DRM method doesn’t require: Opening of the tank or hatch of the fault-free/faulty OLTC and oil drain; Additional money and labor costs for the OLTC diagnostic; Connection of additional elements or knowledge of resistances of current-limiting resistors of the checked OLTC device, since all fine adjustments to a certain OLTC are conducted automatically in the instrument.

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