Complete set of equipment for frequency modulation series resonance test

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ZL-3000Complete set of equipment for frequency modulation series resonance testApplied in industries such as power, metallurgy, petroleum, and chemical engineering, it is suitable for the handover and preventive testing of high-capacity capacitive samples, such as generators, power transformers, and high-voltage cross-linked cables. The TPXZB-210/60 cable AC withstand voltage test equipment can meet the AC withstand voltage test of 35kV cross-linked cables with a length of 1km. Can meet the AC withstand voltage test of 10kV cross-linked cable with a length of 2km. Can meet the AC withstand voltage test of 10kV voltage level power transformers.

ZL-3000Complete set of equipment for frequency modulation series resonance testTechnical Specifications:

Environmental temperature: -10~45 ℃

Environmental humidity: ≤ 90%

Altitude: ≤ 2000M

Power input: 220V ± 10% single-phase 50Hz output 0-2220V (≤ 10KW)

380V ± 10% three-phase 50Hz output 0-400V

Rated test capacity: 0-8000KVA (optional)

Resonant voltage: 0-1000KV (optional)

Frequency adjustment range: 0.1-300Hz

System measurement accuracy: Level 0.5

Frequency regulation division rate: 0.01Hz

Instability: ≤ 0.05%

Output waveform: sine wave

Waveform distortion rate: ≤ 0.5%

Noise: ≤ 60dB

Reactor Q value: 30-200 (optional)

ZL-3000 FM series resonant working environment:

1. Environmental temperature: -150C -400C;

2. Relative humidity: ≤ 90% RH;

3. Altitude: ≤ 1000 meters;

Subject and Test Requirements

1. 64/110kV/300mm2 cable, length 0.2km, capacitance ≤ 0.03uF, test frequency 30-300Hz, test voltage 128kV.

2. 26/35kV/300mm2 cable, length 1.2km, capacitance ≤ 0.228uF, test frequency 30-300Hz, test voltage 52kV.

3. 8.7/10KV/300mm2 cable, length 4km, capacitance ≤ 1.2uF, test frequency 30-300Hz, test voltage 22kV.

4. 110kV substation GIS equipment, 35kV transformer, distribution equipment AC withstand voltage, test frequency 30-300Hz, test voltage 184kV.

Advantages of series resonance in power systems:

1. The required power capacity is greatly reduced. Series resonant power supply generates high voltage and high current through resonance between resonant reactor and the tested capacitor. In the entire system, the power supply only needs to provide the active consumption part of the system. Therefore, the required power supply for the experiment is only 1/Q of the test capacity.

2. The weight and volume of the equipment have been greatly reduced. In a series resonant power supply, not only is the bulky high-power voltage regulating device and ordinary high-power power frequency test transformer eliminated, but the resonant excitation power supply only requires 1/Q of the test capacity, greatly reducing the system weight and volume, usually 1/10-1/30 of ordinary test devices.

3. Improve the waveform of the output voltage. A resonant power supply is a resonant filtering circuit that can improve the waveform distortion of the output voltage, obtain a good sine waveform, and effectively prevent the accidental breakdown of the test sample by harmonic peaks.

4. Prevent large short-circuit currents from burning the fault point. In the series resonance state, when the weak point of the insulation of the test sample is broken down, the circuit immediately disengages and the loop current rapidly drops to 1/Q of the normal test current. However, when conducting voltage withstand tests in parallel resonance or test transformer mode, the breakdown current immediately increases by several tens of times. Compared with the two, the short-circuit current is hundreds of times different from the breakdown current. So, series resonance can effectively identify insulation weaknesses without the concern of large short-circuit currents burning the fault point.

5. There will be no overvoltage recovery. When the test sample breaks down, due to the loss of resonance conditions, the high voltage immediately disappears, the arc immediately extinguishes, and the process of re establishing the recovery voltage is long. It is easy to disconnect the power supply before reaching the flashover voltage again. This voltage recovery process is an intermittent oscillation process of energy accumulation, which is long and does not result in any recovery overvoltage.

The main functions and technical characteristics of our company's frequency modulation resonance device are:

1. The device has protection functions such as overvoltage, overcurrent, zero start, and system detuning (flashover). The overvoltage and overcurrent protection values can be set according to user needs. When the test sample is flashover, the flashover protection action can be taken and the flashover voltage value can be recorded for experimental analysis.

2. The entire device is lightweight and easy to use on site.

3. The device has three working modes, which facilitate users to flexibly choose according to the on-site situation and improve the testing speed.

The working modes are: fully automatic mode, manual mode, automatic tuning, and manual boost mode

4. Capable of storing and printing experimental data using the built-in printer.

5. When the device automatically scans the frequency, the starting point of the frequency can be set arbitrarily within the specified range, and the scanning direction can be selected upwards or downwards. At the same time, the LCD screen displays the boost curve, making it convenient for users to intuitively understand whether the resonance point has been found.

6. Adopting DSP platform technology, it is convenient to add or remove functions and upgrade according to user needs, making the human-machine exchange interface more user-friendly.