Automatic Anti-Interference Dielectric Loss Tester - Yangzhou Darui

Automatic Anti-Interference Dielectric Loss Tester - Yangzhou Darui

Published: 2020-08-27 11:05:59

Category: Dielectric Loss Tester

Product Description

Automatic Anti-Interference Dielectric Loss Tester

Darui Electric recommends:

The automatic anti-interference dielectric loss tester is an intelligent instrument for measuring the dielectric loss tangent (tgδ) and capacitance (Cx). It can measure the dielectric loss tangent (tgδ) and capacitance (Cx) of various insulating materials, insulating bushings, power cables, capacitors, transformers, and other high-voltage equipment on-site under power frequency high voltage. The instrument is an integrated structure with built-in standard capacitor and boost power supply. It is small in size, light in weight, and easy to carry. It has the advantages of simple operation, automatic measurement, intuitive reading, no conversion, high accuracy, and strong anti-interference ability. It can also be used with external power supply and standard capacitors of various specifications produced by our factory to measure high-voltage dielectric loss.

Main Features

1. Automatic and simple: Simple wiring (two wires for normal connection, one wire for reverse connection), all cables have grounding shielding, so they can be used on the ground. The measurement voltage rises and falls slowly, fully automatic measurement, direct reading of results, no conversion needed.

2. Multiple measurement modes: Can choose normal/reverse wiring, internal/external standard capacitor, and internal/external test voltage for measurement. Normal wiring can measure high-voltage dielectric loss.

3. Shock resistance: The instrument can withstand strong vibration and bumping during long-distance transportation without damage.

4. Strong anti-interference ability: Adopts automatic tracking interference cancellation circuit, combining vector operation method with phase shifting method, effectively eliminating the influence of strong electric field interference on measurement, suitable for field tests at power stations of 500kV and below.

5. CVT measurement: Unique self-excitation method for CVT measurement, no additional equipment needed, can complete measurement of non-detachable CVT. One-time wiring (three cables, no need to change wires), one measurement process (about 1 minute), two final measurement results (dielectric loss and capacitance of C1 and C2). The measurement process is displayed in Chinese, and can monitor the self-excitation current value and test voltage (high voltage) in real time. It can eliminate the influence of leads on the test, and the measurement results are accurate and reliable.

6. Safety measures

(1) High voltage protection: In case of short circuit, breakdown, or high voltage current fluctuation of the test object, the high voltage output can be quickly cut off.

(2) CVT protection: Set the overcurrent point of the self-excitation voltage. Once the set current value is exceeded, the instrument automatically exits the measurement without damaging the equipment.

(3) Grounding detection: The instrument has a grounding detection function. If not grounded, the voltage cannot be raised for measurement.

(4) Misoperation prevention: Designed with misoperation prevention, it can identify common wiring errors and give safety alarms.

(5) Anti-"capacitance rise": When measuring large-capacity test objects, the "capacitance rise" effect of voltage increase may occur. The instrument can automatically track the output voltage to keep the test voltage constant.

7. VFD display: Uses a novel large-screen VFD dot matrix display, which can display clearly in severe winter and midsummer. Full Chinese operation menu, operation prompts and various warning messages, intuitive and clear, no need to consult the manual for operation.

8. The instrument is equipped with a micro printer to print out measurement results and status in Chinese.

9. RS232: The instrument has an RS232 interface, which can be connected to a computer for data statistics, processing, and storage.

Technical Specifications

1. Rated working conditions:

Ambient temperature -10℃~50℃

Relative humidity 30%~85%

Power supply: This instrument can use mains or generator power 220V±22V 50±5Hz

2. Dimensions: 1×b×h, mm: 420×305×430

3. Instrument weight: 25kg

4. Measurement range:

Dielectric loss (tgδ) measurement range: 0~100% Resolution 0.01%

Capacitance (Cx) measurement range:

5. Internal connection method: at 10kV, 3pF~40000pF test

at 0.5kV, 60pF~0.8μF

6. External connection method

1) "External boost transformer mode" (external high voltage, internal standard capacitor)

Maximum test voltage 10kV

2) "External Cn mode" (external high voltage, external standard capacitor)

Maximum test voltage is determined by the standard capacitor and the test object (Umax=Imax/ωCn)

Maximum test current of standard circuit (Imax): 1A (In=UωCn)

Maximum test current of test object circuit (Imax): 1A (Ix=UωCx)

7. Basic measurement error

The product shall comply with the provisions of Table 1 under the conditions of ambient temperature 20℃±5℃ and relative humidity 30%~85%. (The change of basic error of the instrument for every 10℃ change in temperature shall not exceed 1/2 of the basic error limit.)

Table 1

Measurement Parameter	Wiring Mode	Basic Error
Dielectric loss tgδ	Normal	±(1% reading + 0.0005)
Dielectric loss tgδ	Reverse	±(1% reading + 0.0010)
Capacitance Cx	Normal	±(1% reading + 1pF)
Capacitance Cx	Reverse	±(1% reading + 2pF)

8. Internal boost transformer output capability

Output voltage: 0.5kV~10kV (divided into 20 gears)

Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.

← Previous
Automatic Dielectric Loss Tester - Yangzhou Darui Next →
Intelligent Dielectric Loss Tester - Yangzhou Darui

Product Details