After the construction and renovation of a substation, it is necessary to verify the primary and secondary terminal wiring of mutual inductors before commissioning, confirm the correctness of mutual inductor polarity, phase and ratio, and identify and eliminate problems in a timely manner. A wind power plant in a certain province has completed renovation and is about to be commissioned. To ensure the correct operation of the newly installed condenser protection device, the HTA-3300 Wireless Remote Control Three-phase Digital Intelligent High-current Source is used to apply high current on the primary side to simulate primary-side load operation, verifying the correctness and reliability of equipment installation and commissioning.

△ HTA-3300 Wireless Remote Control Three-phase Digital Intelligent High-current Source

The HTA-3300 Wireless Remote Control Three-phase Digital Intelligent High-current Source can stably output a maximum three-phase current of 300A, with the current angle adjustable arbitrarily. When used in conjunction with the HTV-6000 Three-phase Digital Intelligent High-voltage Source and YD-300 Intelligent Wireless Remote Control Host for Current and Voltage Sources, it can achieve synchronous output control with a maximum phase voltage of 6000V and phase current of 300A. Cooperating with the YD-300 Wireless Remote Control Host, it can perform synchronous quantity application on primary and secondary circuits and secondary-side measurement, completing the verification of ratio, vector and polarity of voltage and current mutual inductors in the entire primary and secondary circuits. Meanwhile, it checks the primary and secondary circuits to eliminate potential risks that may exist during substation commissioning. This test mainly uses the HTA-3300 High-current Source to verify the CT ratio accuracy of the condenser protection device.

Test Wiring

Apply current to the 6 core-through CTs of the condenser protection device. Connect the HTA-3300 High-current Source to a 380V AC power supply. Pass the Phase A, B and C cables through the 6 CTs of the condenser protection device respectively, and short-circuit the output cable to the N wire of the high-current source to form a current loop. The standalone operation mode is selected for the device. Start the test after the device is reliably grounded.

Test Operation

Set the output of positive-sequence current of 200A for Phase A, B and C, and check the sampling information of the protection device and the substation system background.

Set the output of unbalanced positive-sequence current of 100A, 200A and 300A for Phase A, B and C respectively, verify the three-phase wiring phase sequence, and check the sampling information of the protection device and the substation system background.

After the test, check the secondary-side background sampling values. The comparison and analysis results are normal. The vector checking of the condenser protection in the station is completed before commissioning, which greatly improves the one-time power transmission success rate.