Generator Rotor AC Impedance Tester

Short circuit between turns of generator rotor winding is a common fault in power system. When such a fault occurs, the rotor current increases and the winding temperature rises, limiting the output of the generator, and in severe cases, it will affect the normal operation of the generator. Turn-to-turn short circuits are usually judged by measuring the AC impedance and power loss of the generator rotor winding. The traditional measurement method is to use multiple test instruments and measure them after assembly on site. This method that requires a lot of test instruments to build a measurement system has disadvantages such as bulky test equipment, time-consuming and labor-intensive, cumbersome data sorting, and low measurement accuracy.

With the continuous development of digital signal processing technology, new microprocessors and algorithms continue to emerge. Based on this, we have developed a generator rotor AC impedance tester based on a digital signal processor. The instrument uses the digital signal processing system as the hardware platform, and gives full play to the calculation ability of the digital signal processor, which greatly improves the calculation speed and calculation accuracy of the instrument, and provides a guarantee for the normal operation of the power system.

2.1 Automatic (manual) acquisition, measurement, display, storage and printing of all measurement parameters and AC impedance characteristic curves;

2.2 Real-time display of measurement data and AC impedance characteristic curve, convenient for storage and printing;

2.3 Using 320×240 large-screen LCD display, Chinese menu prompts, easy operation;

2.4 Built-in large-capacity non-volatile memory: 200 sets of measurement data and curves can be stored;

2.5 Built-in high-precision real-time clock function: date and time calibration can be performed;

2.6 Built-in high-speed micro thermal printer: can print measurement and historical data;

2.7 Concurrently do the no-load and short-circuit tests of single-phase transformers and the volt-ampere characteristics tests of voltage (current) transformers and arc suppression coils;

2.8 With perfect overvoltage and overcurrent protection functions, the overvoltage and overcurrent protection value is automatically adjusted according to the setting of the test parameters, which is simple and can ensure the safety of the equipment under test.

Measuring range Impedance: 0～999.9Ω

Voltage: 0～600V

Current: 0～120A

Power: 0～72kW

Speed: 0～3600rpm

Frequency: 45～65Hz

Accuracy Voltage, current, speed, frequency: 0.2 level

Impedance: 0.5 level

Power: 0.5 class (cosφ> 0.5), 1.0 class (0.5 ≥ cosφ ≥ 0.2)

Dimensions 345mm×295mm×175mm

Instrument weight 5kg

environment temperature -10℃～50℃

Environmental humidity ≤85%RH

Working power supply AC220V±10%

Power frequency 50±1Hz