The Variable Frequency Anti-interference Dielectric Loss Tester (Frequency interference dielectric loss tester) is a high-precision instrument used for fully automatic measurement of the dielectric loss tangent and capacitance of various high-voltage power equipment at power plants, substations, and other field sites..The main power is generated by the built-in inverter, and after being boosted by the transformer, it is used for testing the test object.
Working Principle
Under the action of AC voltage, the dielectric consumes a portion of electrical energy, which is converted into heat energy and causes losses. This energy loss is called dielectric loss. When an AC voltage is applied to the dielectric, there is a phase angle difference ψ between the voltage and current in the dielectric. The complementary angle δ of ψ is called the dielectric loss angle, and the tangent of δ, tgδ, is called the dielectric loss tangent. The tgδ value is a parameter used to measure dielectric loss. The instrument's measurement circuit includes a standard circuit (Cn) and a test circuit (Cx), as shown in Figure 1. The standard circuit consists of a built-in high-stability standard capacitor and the measurement circuit, while the test circuit consists of the test object and the measurement circuit. The measurement circuit is composed of a sampling resistor, a preamplifier, and an A/D converter. Through the measurement circuit, the amplitudes and phase differences of the currents in the standard circuit and the test circuit are respectively measured, and then the digital signal processor uses digital real-time acquisition methods and vector operations to obtain the capacitance value and dielectric loss tangent of the test object.
Main Technical Parameters
Operating conditions: -5℃∽40℃ RH<80%
Power supply: AC 220V±10%, frequency unlimited
High voltage output: 1KV∽10KV, in 1kV steps
Accuracy: 5%
Maximum current: 140mA
Capacity: 1000VA
Self-excitation power: AC 0V∽30V, 45HZ/55HZ
Maximum current: 15A
Resolution: tgδ: 0.001% Cx: 0.1pF
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
