7010C High-Voltage, Capacitance, Inductance, Tan Delta Bridge

The 7010C High-Voltage, Capacitance, Inductance, Tan Delta Bridge is a microprocessor-controlled, current comparator based, automated capacitance bridge with metrology capabilities. However, it can also be used to measure inductance, reactor loss, AC resistance and the calibration of MI CTs.

The principle of the 7010C is based on the two-stage-compensated current comparator. The automatic self-balancing feature facilitates the use of the bridge for accurate load loss measurements of large high-voltage inductive loads. This is a major advantage over the manual capacitance bridges which have difficulty in following frequency changes.

The model 7010C has the following ratios: 1:1, 2:1, 5:1, 10:1, 20:1, 50:1, 100:1, 200:1, 500:1 and 1000:1 with an overall accuracy of < 15 ppm in magnitude and 1 % of reading ± 10 ppm in dissipation. The dissipation (loss tangent) has a range of 0 to 10 % with a resolution of 1 ppm making it ideal for both low and high-voltage applications.

To accommodate capacitance ratios larger than 1000:1 an additional two-stage range extender, model 7020, may be added to increase the ratio to 2,000,000:1. All connections are made on the rear of the instrument. The effect of lead length on the measurement accuracy has been reduced by means of a built-in lead compensation circuit. An optional shielded rack on castors is available for portability on the test floor.

Applications for the 7010C include: