CIT Automatic Capacitance and Inductance Tester

Introduction

Automatic inductance capacitance tester is specially developed and researched for problems existing in substation field measurement of capacitance value of capacitor, it can solve the following problems:

(1) Field measurement capacitor needs dismantling cables, not only the big workload but also easy to damage the capacitor.

(2) Low capacitance meter output voltage causes the fault detection rate is low.

(3) Reactor inductance measurement.

Technial specifications

1. Instrument measurement range and accuracy:

a. Capacitance measurement.

(1) Measurable capacitance range: 0. 1μF ～ 3300μF

(2) Measurable capacity range: 5 ～ 20000kvar

(3) Measurement accuracy: ±(1.0% readings +0.02μF)

(4) Resolution: 0.001μF

b. Current measurement.

(1) Current measurement range: 0～20A

(2) Measurement accuracy: ±(3.0% readings +0.05A

(3) Resolution: 0.01A

c. Inductance measurement

(1) Inductance measurement range:

Small inductance mode 0.1mH～5mH

Large inductance mode 5 mH～50H

(2) Inductive reactance measurement range: 50mΩ~20KΩ

(3) Measurement accuracy: ±(3.0% readings +0.05mH)

(4) Resolution: 0.01mH

d. Resistance measurement

(1) Resistance measurement range:

Small resistance mode 50mΩ～1Ω

Large resistance mode 1Ω～20KΩ

(2) Measurement accuracy: ±(3.0% readings +0.05Ω)

(3) Resolution: 0.01 Ω

2. Working power supply:

a. Rated voltage: power frequency of 220 V±10%

b. The rated frequency: 50Hz

c. The rated output: 2V/20V/500VA

3. Equipment normal working conditions:

a. Environmental temperature: -10℃ ～ +50℃

b. Relative humidity: ≤90%

4. Display and print mode: LCD display with Chinese/English characters

Panel high speed printer

5. Size: 370×260×220 mm ,15 kg

6. Work principle (as shown in figure 1)

The inductance capacitance tester adopts the bridge circuit structure, the standard capacitor and sample capacitor as two arms of the bridge circuit. When conducting the capacitor capacitance value measurement, test voltage applies on the standard capacitor and sample capacitor at the same time. Processor obtains capacitance value of sample capacitor by sensors with acquisition the current signals through the two capacitors after processing.

Due to adopting the standard capacitor, sample capacitor synchronous sampling technology, it may not affected by the power supply voltage fluctuation. Combined with fully automatic measurement process, which avoids the error due to manual operation, it has the characteristics of good stability, good repeatability, accurate and reliable, the machine has tested object automatic identification and short circuit protection function.