Automatic device for insulation complex admittance monitoring in 330 kv current transformers under operating voltage (kitt 30)

This device provides automatic monitoring of variation of a sum of insulation admittance currents in three phases of a current transformer, previously balanced to minimum, in each connection. The device is used as a part of an automatic operation control system in a power installation.

Specifications

KIT FOR BASIC INSULATION MONITORING IN 330 KV CURRENT TRANSFORMERS UNDER OPERATING VOLTAGE

Measured variables:

1. dielectric loss (tg d) of a current transformer insulation in a monitored connection, relative to a current transformer in a reference connection;

2. complex admittance (sum of basic insulation leakage currents in three phases), using a selective voltmeter.

Kit components:

• stationary sensors mounted between the measuring terminal and the current transformer case;

• connection cabinets, mounted on the supports of “B” phases in the connection;

• portable measuring circuit, including two cable drums with a shielded cable;

• connection unit and measuring bridge (P5026);

• selective voltmeter.