FERRORESONANT OVERVOLTAGE PROTECTIVE DEVICE OF MOLDED POTENTIAL TRANSFORMERS IN INSULATED-NEUTRAL POWER NETWORK

摘要

FIELD: electrical engineering. ^ SUBSTANCE: windings of three type NOL single-phase potential transformers are connected in star within proposed device; integrated XYZ neutral leads of high-voltage windings and terminals connecting them should withstand test voltage specified for them; primary winding of fourth type NOL potential transformer is connected between neutral lead of these transformers and ground and its secondary winding is used for connecting insulated-neutral network ground-fault detection relay. ^ EFFECT: enhanced operating reliability of molded potential transformers and electricity metering efficiency. ^ 1 cl, 2 dwg