Three-phase zinc oxide arrester tester

Instructions:

1. Reliably ground the grounding terminal of the instrument and connect to the power supply. Turn on the power switch, and the display screen will show:

Display connection mode, set PT ratio value

Start measuring data

View historical data

Click the "Confirm" key, and the screen enters the display wiring mode

Laboratory wiring diagram

This method requires an adjustable AC high-voltage power supply. The voltage signal input is connected to the measurement terminal of the test transformer. One end of the zinc oxide arrester is connected to high voltage, and the other end is grounded through a protector, connected together with the instrument's ground. The AC current signal input is connected to the upper end of the protector.

Click "→" and the screen displays the online wiring diagram (live test). During online measurement, the voltage signal input is connected to the secondary side of the PT in the same phase as the arrester under test, the current signal input is connected to the upper end of the arrester's counter, and the instrument's grounding terminal is connected to the lower end of the counter and linked to ground.

According to on-site requirements, refer to the above wiring methods for correct connection

2. After correct connection, move the cursor to "Set PT ratio value" and click "Confirm". The screen enters the setting interface.

Display wiring mode

Set PT ratio value    PT=1 000.00

Start measuring data

View historical data

Input the ratio correctly according to the actual ratio. Input method: Press the "→" key to move the cursor to the position to be modified, then press the "↑" key to increase or decrease the value.

*Note the correct calculation method of the ratio:

Method for determining the ratio of the test transformer: The ratio here should be the turns ratio or voltage ratio between the high-voltage winding and the measurement winding. For example, for a test transformer with a rated AC output voltage of 50KV, the rated voltage of the measurement winding is generally 100V, so the ratio is 50KV/100V=500. Method for determining the online ratio: Taking a 110KV arrester as an example, its ratio is (110KV/   )/(100V/   )=1100.

Press the "Confirm" key until the screen prompts whether the ratio value is correct. When pressing "No", the screen returns to resetting the PT ratio value. If everything is checked and correct, press the "OK" key to enter the measurement state.

3. Press the "Confirm" key.