Generator Characteristics Tester

The Generator characteristics tester is specially designed to complete the electrical start-up test after the overhaul of the generator set of the power plant. It can complete various characteristic curves of the generator (generator no-load, short circuit, de-excitation, zero-start, ±10% step, The real-time measurement and analysis of frequency test and load test of exciter, etc., have the characteristics of multiple measurement signals and high accuracy.

1. Use standard interfaces to meet the needs of various power plants (thermal power plants, hydropower plants, nuclear power plants, etc.).

2. Data can be collected automatically or interactively.

3. Real-time drawing of characteristic curves makes the test more intuitive.

4. The waveform can be compared, and the measured data and historical data can be compared with the same coordinates to facilitate judgment.

5. The detection data is stable, accurate and reliable, so that the overhaul of the motor can be correctly judged to ensure the normal operation of the generator.

6. Using chart output mode, it is easier to analyze, judge and archive.

7. Adopt industrial computer motherboard, integrated design of large-screen LCD display and test unit, higher reliability

8. The system has a high degree of program control, which greatly reduces the complexity of testing and improves work efficiency and safety.

9.6 Voltage signal processing adopts advanced electromagnetic induction and photoelectric isolation principle, which has high test accuracy, fast response time and stable performance. Input and output are completely isolated, the isolation voltage is greater than 3KV, the overload capacity can last twice the nominal voltage (3-phase 150V, 3-phase 750V), and the input impedance is greater than 150KΩ (or 750 KΩ).

10.3 current signal processing adopts clamp-type current sensor, convenient and safe on-site wiring, high test accuracy, fast response time and stable performance. Input and output are completely isolated, the isolation voltage is greater than 3KV, the continuous overload can be 2 times the nominal value, and the instantaneous overload is 20 times 60 seconds.

1. Access characteristics of 12 channels of signals:

0∽150V AC voltage 3 groups (secondary voltage of stator)

0∽750V AC voltage 3 groups (secondary voltage of exciter stator)

0∽10mA alternating current 3 groups (secondary current of stator via clamp current sensor)

0∽±75mV DC voltage 2 groups (generator rotor current)

0∽±1000V DC voltage 1 group (generator rotor voltage)

2. Precision:

12-channel signal accuracy 0.5 level

A/D sampling 12 bits, rate 125kHz

3. Response time: ≤20ms

4. Two USB ports: use for data export

5. Starting mode: manual; automatic

6. Power supply: AC220±10%

7. Instrument appearance: 330×310×202, instrument weight: 15kg

The signal access is on the cover of the instrument. The wiring terminal layout and definition are as follows

1: The generator stator voltage is connected to the terminal.

2: The generator stator current and the main exciter stator current are multiplexed terminals. The signal is connected through the clamp-type current sensor provided at the machine, and the secondary current of the stator cannot be connected directly.

3: The main exciter stator voltage access terminal.

4: Connect the generator rotor voltage to the terminal.

5: The generator rotor current is connected to the terminal. The signal is a DC 75mV signal connected through a shunt.

6: The rotor current of the main exciter is connected to the terminal. The signal is a DC 75mV signal connected through a shunt.

For the three signals of Uf, If, and Ilf, you must pay attention to the positive and negative directions. The unused DC parameter channels are short-circuited with short-circuit wires.

Use a clamp-type current sensor to clamp the secondary current wiring of the generator (or main exciter) stator, and connect the leads of the clamp to the signal interfaces Ia, Ib, and Ic according to the different phases Ia, Ib, and Ic.

The ground terminal on the rear panel of the instrument is connected to the system ground through a wire.