Circuit Impedance Tester Instrument Overview
According to its change magnitude, the degree of winding deformation can be preliminarily estimated. After a short-circuit current impact, the change in low-voltage short-circuit impedance compared to the initial test should not exceed 2%.
Circuit Impedance Tester is the most direct method to identify whether the windings of a transformer in operation have deformed after being subjected to short-circuit current impacts or mechanical impacts during transportation and installation. It is of great significance for judging whether the transformer can be put into operation, and it is also one of the bases for determining whether the transformer requires disassembly inspection.
Instrument Functions
Circuit Impedance Tester Functional Features
1. It is an instrument used for measuring low-voltage short-circuit impedance of main transformers at 35KV and above under field and laboratory conditions. The instrument is small in size and light in weight.
2. The instrument adopts voltage and current synchronous AC sampling and signal digital processing technology internally, ensuring accurate measurement data.
3. The transformer short-circuit impedance tester adopts a single-phase measurement method. Only the low-voltage side needs to be short-circuited, and the non-tested phases on the high-voltage side do not need to be short-circuited. After selecting the transformer connection, three measurements can automatically calculate the short-circuit impedance of each phase.
4. The instrument has a function of automatically converting low current test results to rated current, suitable for field use.
5. The instrument can simultaneously measure voltage, current, and power, and also measure the frequency of the applied power supply.
6. The instrument can automatically or manually record the applied voltage and current. After completing three-phase measurements, it can automatically calculate the short-circuit impedance of each phase.
7. The transformer short-circuit impedance tester is equipped with a non-volatile memory that can store measurement data for a long time, and the instrument comes with a built-in printer.
8. The transformer short-circuit impedance tester has a large-screen LCD display with all Chinese menus and operation prompts, making operation simple and intuitive.
Instrument Technical Parameters
Circuit Impedance Tester - Technical Parameters
1.
Power: COSφ>0.1: 0.5 class; COSφ≤0.1: 1.0 class
2.
3、
4. Operating Temperature: -10℃～50℃
5. Operating Humidity: 0～80%
6. Power Supply: AC220V±10﹪ 50Hz±1Hz
7. Dimensions: 360mm×220mm×150mm
8. Instrument Weight: 5Kg
