Knowledge of the hottest dielectric loss tester

2022-08-15
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Knowledge of dielectric loss tester

dielectric loss tester is an advanced instrument for measuring dielectric loss and capacitance. It is used for measuring various insulating materials and insulating bushings under power frequency and high voltage. It seems that the focus is not on imported goods, dielectric loss and capacitance of power cables, capacitors, mutual inductors, transformers and other high-voltage equipment

dielectric loss tester product features:

◆ simple operation, Chinese display, printing

◆ easy to use, no conversion

◆ if the stress continues to increase to point C, the dielectric loss tester has the advantages of high voltage, strong anti-interference ability, short test time, etc.

dielectric loss tester alternative name:

dielectric loss tester, anti-interference dielectric loss tester, fully automatic dielectric loss tester, different frequency dielectric loss tester, different frequency dielectric loss tester Introduction to anti-interference dielectric loss tester, automatic dielectric loss tester dielectric loss tester

the technology of dielectric loss tester has developed rapidly. QS1 Xilin bridge, which was widely used in power system before, is being replaced by intelligent dielectric loss tester. The new generation of dielectric loss tester has built-in boost equipment and standard capacitance, and has the characteristics of simple operation, accurate data, convenient reading of test results, etc. Although the dielectric loss test technology has developed rapidly at present, there is still a big gap in many aspects compared with the international level in the morning of March 8. The gap is mainly reflected in the following aspects:

(1) anti interference ability

because the dielectric loss test is a highly sensitive project, the test data are also vulnerable to the interference of external electric fields. At present, the anti-interference methods adopted by the dielectric loss tester mainly include: phase inversion method, phase shift method Different frequency method, etc. Although these methods can solve the problem of interference to a certain extent, when the external interference is strong, there will still be a large deviation

(2) test accuracy of reverse connection method

many power equipment on site have been grounded, so reverse connection method must be used for detection, but when reverse connection, there are many factors affecting the test data, and the data often have great deviation, especially when the capacity of the tested object is small (such as sleeve), when the high-voltage conductor is dragged to the ground (although some high-voltage conductors equipped with dielectric loss tester can be dragged to the ground, the leakage current to the ground is large), It will seriously affect the accuracy of test 1

dielectric loss tester features:

1. Due to the use of frequency conversion technology, it can ensure accurate measurement under strong electric field interference

2. The instrument adopts Chinese menu operation, and the microcomputer automatically completes the whole process of measurement

3. The instrument is also suitable for measuring Tg of high-voltage electrical equipment in workshops, laboratories and scientific research institutions δ And capacitance; The loss test of insulating oil is more convenient, simple and accurate. Bus processing machine

4. This instrument can measure ungrounded or directly grounded high-voltage electrical equipment by positive and negative wiring methods. At the same time, the Tg of capacitive voltage transformer can be measured δ And main capacitance C1 and C2

5. The instrument is internally equipped with a high-voltage step-up transformer, and safety protection measures such as zero crossing closing and lightning protection are taken. During the test, different levels of high voltage of 0.5kV ~ 10kV are output, and the operation is simple and safe. Working principle:

after starting the measurement, the set value of high voltage is sent to the variable frequency power supply. The variable frequency power supply uses PID algorithm to slowly adjust the output to the set value. The measuring circuit sends the measured high voltage to the variable frequency power supply, fine tune the low voltage, and realize accurate high voltage output. According to the forward/reverse wiring settings, the measuring circuit automatically selects the input and switches the range according to the test current. The measuring circuit uses Fourier transform to filter out the interference, separate the signal fundamental wave, carry out vector operation on the standard current and the sample current, calculate the capacitance by amplitude, and calculate TG by angular difference δ。 Repeat the measurement for many times, and select an intermediate result through sorting. After the measurement, the measurement circuit sends a step-down command, and the variable-frequency power supply slowly steps down to 0

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