Voltage Transformer Load Box

I. Key Technical Specifications

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

6. Accuracy: ±3° ±0.025VA

7. Test Voltage: 2kV

8. Rated Frequency: 50Hz

User's Guide

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

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

Ensure the equipment is properly grounded.

4. If users suspect that the load box is inaccurate, they can use a multimeter for a simple check. The method is to set the multimeter to the resistance range, 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: Co-directional Component : Perpendicular Component

Note:

The iron core coil of the load box is sealed with adhesive upon factory shipment and should not be struck at will to avoid changes in admittance.