Working principle of transformer short-circuit impedance tester

The working principle of the transformer short-circuit impedance tester is mainly based on Ohm’s law. The following is a detailed explanation:

1. Basic principles

The transformer short-circuit impedance tester calculates impedance by applying voltage to the primary side of the transformer and measuring the current flowing through the winding according to Ohm’s law (R=U/I, where R represents resistance, U represents voltage, and I represents current). This principle is the core of the tester’s operation.

2. Testing process

① Applying voltage: The tester applies a known voltage to the primary side of the transformer.

② Measure current: At the same time, the tester measures the current flowing through the transformer winding.

③ Calculate impedance: Using Ohm’s law, calculate the short-circuit impedance of the transformer based on the applied voltage and measured current.

3. Technical features

① Dual A/D synchronous AC sampling: The tester adopts dual A/D synchronous AC sampling technology internally to ensure the accuracy of measurement data.

② Digital signal processing technology: Combined with digital signal processing technology, it further improves the accuracy and stability of measurement.

③ Multi parameter measurement: It can not only measure the short-circuit impedance of transformers, but also measure parameters such as short-circuit reactance, short-circuit resistance, and three-phase impedance voltage, providing comprehensive test data.

4. Application scenarios

The transformer short-circuit impedance tester is widely used in the following scenarios:

① Factory testing: Conduct a short-circuit impedance test on the transformer before leaving the factory to ensure product quality.

② Overhaul test: After the transformer is overhauled, use a tester to check whether the winding is deformed or damaged.

③ Preventive testing: Conduct preventive testing before the transformer is put into operation to evaluate its operational status.

④ Handover test: Conduct short-circuit impedance testing during the transformer handover process to ensure that the equipment meets operational requirements.

5. Precautions

① Test conditions: The test should be conducted at the rated frequency (sine waveform) and under conditions close to the rated current to ensure the accuracy of the test results.

② Safety measures: During the testing process, safety operating procedures should be strictly followed to ensure the safety of personnel and equipment.

③ Data analysis: After the testing is completed, a detailed analysis of the measurement data should be conducted to evaluate the operational status and potential issues of the transformer.

In summary, the transformer short-circuit impedance tester works by applying voltage, measuring current, and calculating impedance, and has the characteristics of high accuracy, multi parameter measurement, and wide application scenarios. During the testing process, it is necessary to strictly follow the operating procedures and precautions to ensure the accuracy and safety of the test results.

ZC-204B Transformer Short Circuit Impedance Tester is an instrument specifically designed for measuring low voltage short circuit impedance of transformers under on-site and laboratory conditions. The instrument comes with an adjustable power output, which is particularly suitable for on-site operation of 110kV and above main transformers. Short circuit impedance test is the most direct method to identify whether the winding of a transformer is deformed after being impacted by short-circuit current during operation or mechanical force during transportation and installation. It is of great significance for determining whether the transformer can be put into operation and is also one of the basis for determining whether disassembly inspection is required for the transformer.

Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com