Method for live testing of three-phase capacitance with inductance tester

Hubei Zhongce Gaoce Electrical Holdings Co., Ltd. answers your question: Method for live testing of three-phase capacitance with variable frequency three-phase capacitance and inductance tester

Variable frequency three-phase capacitance and inductance tester for three-phase capacitance testing

1. Three phase capacitor parameter setting

After selecting the "Three phase Capacitor" item under the "Main Menu" screen, press the "Confirm" button to enter the "Three phase Capacitor Parameter Settings" screen, as shown in Figure 6.

Figure 6

Please refer to section 5.3.1 for specific usage instructions.

Sample type: High and low voltage parallel capacitor banks for power, with internal connection methods including three-phase Y-shape, three-phase Yn shape, three-phase △ shape, and three-phase III shape. This instrument is pre-set with all connection types. Please select the correct sample type for different connection methods and correctly connect the test lines.

Measurement method: When conducting three-phase capacitance testing, only the built-in power supply of the instrument can be used for testing, and external power supply cannot be used.

2 Three phase capacitance test

After completing the parameter settings, connect the test line as required to start the test. After the test is completed, enter the "Test Results" screen, as shown in Figure 7, where you can perform operations such as "Store Data", "Print Data", and "Continue Test".

Figure 7

① Phase capacitance display, showing single-phase capacitance of phase A, phase B, and phase C.

② Three phase total capacitance display, displaying the capacitance, reactance value, and capacity value of the three-phase total capacitance.

Three phase capacitor test wiring

When testing three-phase capacitance, simply insert the testing wire that comes with the instrument into the instrument, clamp the test sample with voltage clamps according to the wiring requirements, and set the relevant parameters to conduct the test, without the need for an external clamp current transformer.

Three phase Y-shaped

Figure 8

Three phase Yn type

Figure 9

Three phase △ type

Figure 10

Three phase III type

Figure 11

Testing precautions

During on-site testing, it is necessary to ensure that the instrument is reliably grounded.

For the Yn type neutral point grounded test sample, clamp the black clip to the grounding point N.

During on-site testing, the measurement can only be started after the voltage clamp has clamped the test sample, otherwise the output current surge may cause instrument protection.

Variable frequency three-phase capacitance and inductance tester for current testing

This instrument can be used with a matching clamp type current transformer for individual current measurement, without the need to connect a voltage test line for current measurement. After selecting the "Current Test" option under the "Main Menu" screen, press the "Confirm" button to enter the "Current Test" screen, as shown in Figure 12.

Figure 12

On the "Current Test" screen, simple harmonic analysis can be performed on current data to help users analyze power quality.