Product Details

Dielectric Loss Tester

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The dielectric loss tester is a high-precision testing instrument used in power plants, substations and other field or laboratory settings to test the dielectric loss tangent and capacitance of various high-voltage power equipment.The instrument has an integrated structure, with a built-in dielectric loss test bridge, variable frequency voltage regulating power supply, step-up transformer and SF6 high stability standard capacitor. The high-voltage test source is generated by the internal inverter, and after being boosted by the transformer, it is used for testing the test object. The frequency can be changed to 45Hz or 55Hz, 55Hz or 65Hz, using digital notch technology to avoid interference from the power frequency electric field, fundamentally solving the problem of accurate measurement under strong electric field interference. It is also suitable for testing with generator power supply after a complete power outage. The instrument can be equipped with an insulating oil cup to test the dielectric loss of insulating oil.

Working Principle

Under the action of AC voltage, the dielectric consumes part of the electrical energy, which is converted into heat energy and causes loss. This energy loss is called dielectric loss. When AC voltage is applied to the dielectric, there is a phase angle difference Ψ between the voltage and current in the dielectric, and 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 measurement circuit includes a standard circuit (Cn) and a test circuit (Cx). The standard circuit consists of a built-in high stability standard capacitor and the measurement circuit, and the test circuit consists of the test object and the measurement circuit. The measurement circuit consists of a sampling resistor, a preamplifier and an A/D converter. The measurement circuit measures the amplitude and phase of the standard circuit current and the test circuit current respectively, and then uses a microcontroller with digital real-time acquisition methods and vector operations to obtain the capacitance value and dielectric loss tangent of the test object.

The instrument has built-in anti-interference measures to ensure accurate measurement under external electric field interference.

Technical Parameters

 

1	Operating Conditions	-5℃∽40℃			RH<80%
2	Anti-interference Principle	Variable Frequency Method
3	Power Supply	AC 220V±10%			Frequency Unlimited
4	High Voltage Output	0.5KV∽10KV			Every 0.1kV
Accuracy			2%
Maximum Current			200mA
Capacity			1500VA
5	Self-Excited Power Supply	AC 0V∽50V/15A			45HZ/55HZ
6	Resolution	tgδ: 0.001%			Cx: 0.1pF
7	Accuracy	△tgδ:±(Reading*1.0%+0.040%)
△C x :±(Reading*1.0%+1.0PF)
8	Measurement Range	tgδ	Unlimited
C x	15pF < Cx < 200nF
	10KV	Cx < 60 nF
	5KV	Cx < 100 nF
	1KV	Cx < 200 nF
CVT Test		Cx < 200 nF
9	CVT Ratio Range	10∽10000
CVT Ratio Accuracy	0.1%
CVT Ratio Resolution	0.1
10	Dimensions	430（L）×330（W）×330（H）
11	Memory Size	80 Groups, supports U disk data storage
12	Weight	28 Kg

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