Voltage Transformer Calibration Procedure

I. Key Technical Specifications

1. Environmental Conditions

Temperature: 5-40°C, Humidity: <80% (at 25°C)

Altitude: <1500m

2. Rated Capacity: 1.25～158.75 VA

Voltage Range: 20%-120%

Secondary Voltage: 100V, 100/ V

Power Factor: 0.8, 1.0

Accuracy: ±3° ±0.025VA

Test Voltage: 2kV

8. Rated Frequency: 50Hz

User's Guide

Connect this device between the a and x terminals of the test voltage transformer.

2. Adjust the load to the actual secondary load of the test voltage transformer.

Ensure the equipment is securely grounded.

4. If users suspect that the load box is inaccurate, they can simply judge it using a multimeter. The method is to set the multimeter to the resistance range and then toggle the load box switches sequentially; the resistance values should increase or decrease in a regular pattern.

Section 3: Error Calculation Formula

P=   

P: Secondary Load f: Concurrent Component : Perpendicular Component

Note:

The iron core coils of the load box are factory-sealed with adhesive and should not be struck at will to avoid changes in admittance.