Ac withstand test for single hydrodynamo with capacity of 250MW or less
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With the development of power system, the capacity of running equipment is increasing. For example, Thermal generator group, the single capacity has exceeded 1000MW, and hydrodynamo group, the maximum capacity has reached 800MW. If traditional test equipment (power frequency test transformer) is used for the ac power frequency withstand Voltage test of these devices, the regulator is very bulky because of the large test capacity required, and the high-capacity test power supply is difficult to solve in the field, so the field test is extremely inconvenient. The Power frequency withstand voltage tester host, no matter from test Power supply capacity, equipment weight, the waveform and has advantages in such aspects as investment. The Power frequency withstand voltage tester host focuses on the potential of capacity of 250 mw and below hydrodynamo ac withstand voltage test of the design and manufacture.
product names: Power frequency resonance、Power frequency series resonance、Series resonance、Series resonant transformer、Series resonance test equipment、Adjustable frequency resonant voltage withstand device、Power frequency withstand voltage tester host
| Rated output voltage | 0~60kV(AC RMS) and below |
| output frequency | 50Hz |
| Resonance voltage waveform | Pure sine wave, waveform distortion rate ≤1% |
| Work system | Full power conticontrol consolenuous working time of 1min |
| quality factor | 10~40 |
| Maximum test capacity | 3000kVA and below |
| Working power supply | 380V±15%、Power frequency 50Hz |
| Product model | control console | Voltage regulator | reactor(dry) | Excitation transformer(dry) | Voltage divider | Scope of application |
| UHV(L)-200kVA/25kV | 30kW | 30kVA(electric) | 200kVA/25kV Adjustable one | 30kVA dry | 30kV | hydrodynamo.0.4~1.0μF.(10kV/40MW) |
| UHV(L)-300kVA/50kV | 60kW | 60kVA(electric) | 300kVA/50kV Adjustable one | 60kVA oil-immersed | 50kV | Thermal generator.0.27~0.33μF.(20kV/300MW) |
| UHV(L)-600kVA/50kV | 60kW | 60kVA(electric) | 200kVA/50kV Adjustable one 400kVA/50kV Adjustable one |
60kVA oil-immersed | 50kV | Thermal generator.0.113~0.45μF.(20kV/600MW) |
| UHV(L)-1200kVA/50kV | 120kW | 120kVA(induction) | 200kVA/50kV Fixed two 800kVA/50kV Adjustable one |
120kVA oil-immersed | 50kV | hydrodynamo.0.6~1.8μF.(20kV/250MW) |
| UHV(L)-2750kVA/55kV | 300kW | 300kVA(induction) | 750kVA/55kV Fixed two 1250kVA/55kV Adjustable one |
120kVA oil-immersed | 60kV | hydrodynamo.1.6~3.3μF.(20kV/770MW) |
Note: the solution can be customized according to the parameters of test objects
| hydrodynamo | Rated Capacity(WM) | rated voltage(kV) | Phase capacitor(μF) |
| 72.5~85 | 10.5 | 0.694 | |
| 125~150 | / | 1.8~1.9 | |
| 300 | 15.75 | 1.7~2.5 | |
| 400 | 18.0 | 2~2.5 | |
| 600 | / | 2.1~2.5 |
| Feature | UHV(L) Power Frequency Series Resonant Test System | UHV(L) Variable Frequency Series Resonant Test System |
| Primary Application | Specifically designed for AC withstand voltage testing of single hydro-generators with a capacity of 250MW or less and similar high-voltage electrical apparatus. | Designed for a broad range of applications, including AC withstand testing of power cables (e.g., XLPE), GIS, main transformers, and busbars. |
| Operating Principle | Achieves resonance by physically adjusting the inductance of its reactors to match the capacitance of the test object at a fixed 50Hz power frequency. | Achieves resonance by adjusting the output frequency (typically 30-300Hz) of its power supply to match the resonant frequency of the circuit. The reactor inductance remains fixed. |
| Output Frequency | Fixed at 50Hz. | Variable (e.g., 30-300Hz). This is the defining feature. |
| Test Object Capacitance | Optimized for the specific capacitance range of large generators (e.g., 0.4μF to 3.3μF). | Highly versatile and can be adapted to a wide range of test object capacitances by tuning the frequency, making it suitable for long cables and other equipment. |
| Configuration & Tuning | System configured with a combination of fixed and adjustable reactors to match the generator's capacitance. Requires selecting the correct physical tap setting. | The system uses an electronic control unit that automatically sweeps through frequencies to find the exact resonant point. No physical reactor adjustments needed. |
| Key Advantage | Provides a pure 50Hz test waveform which perfectly matches the operational frequency of generators. This is a requirement for some international standards for generator testing. | Provides high flexibility and portability with a single set of reactors suitable for testing cables, GIS, and transformers in the field. |
| Core Components | AC power source, voltage regulator, excitation transformer, inductance-adjustable reactors, and a high-voltage divider. | Variable frequency control power supply, excitation transformer, reactors (usually fixed inductance), and a capacitive voltage divider. |
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1、Due to full compensation of resonant reactive power, the power of power supply and equipment is less than 1/10 of the required capacity of the subject (1/q10); Small size and light weight with the same capacity, large output capacity of the device and small power capacity required for configuration, cheap, convenient and safe operation.
2、Series resonance is actually a current filtering circuit, so that the current passing through the subject is basically the fundamental current, and the waveform distortion rate (THD) of the output voltage is very small, which is superior to all existing ac voltage withstand equipment.
3、The short circuit current of the sample after flashover or breakdown is only less than 1/10 (1/Q) of the test current before short circuit, which can effectively prevent the expansion of damage to the fault point after breakdown.
4、After flashover, the arc will be automatically extinguished immediately. The long (number of seconds) process of restoring resonant state voltage after arc quenching is a steady-state establishment process, and there is no danger of voltage overshoot and no danger of restoring overvoltage in microsecond millisecond transient process.
1、Generating Stable Power Frequency High Voltage: The system outputs a fixed 50Hz frequency, with a rated output voltage of up to 60kV (RMS) and a maximum test capacity of 3000kVA.
2、Pure Sine Wave Output: Through the resonant filtering circuit, it ensures the output voltage waveform is a pure sine wave with a total harmonic distortion (THD) of ≤1%, which is superior to conventional test equipment.
3、Modular Configuration: The system consists of a control console, voltage regulator, reactor (dry-type), excitation transformer (dry-type or oil-immersed), and a voltage divider. Reactors are available in fixed and adjustable types, allowing flexible configuration based on the test object's capacitance.
4、Optimized for Generators: The system is specifically designed and manufactured for AC withstand voltage testing of hydro generators with capacities up to 250MW and thermal generators.
1、Significantly Reduced Power Supply Requirements: Through resonant reactive power compensation, the required power supply capacity is less than 1/10 (1/Q > 10) of the test object's capacity, effectively solving the challenge of insufficient on-site power for large-capacity tests.
2、Lightweight and Portable: Compared to traditional large-capacity power frequency test transformers, this system is significantly smaller and lighter, facilitating transportation and on-site setup.
3、Excellent Output Waveform: The resonant circuit acts as a filter, ensuring the output current is predominantly the fundamental current, resulting in extremely low voltage waveform distortion and preventing false breakdowns caused by harmonic peaks.
4、High Safety and Minimal Fault Damage: In the event of flashover or breakdown, the short-circuit current is limited to less than 1/10 of the normal test current, effectively preventing damage to the fault point. The arc is automatically extinguished immediately, and the voltage recovery process is slow (several seconds), eliminating the risk of transient overvoltage.
5、Cost-Effective: For the same output capacity, the required power supply is much smaller, making the system more economical and easier to operate.
Enterprise products in strict accordance with international and national standards and rules of industry production, through the national, provincial and municipal electric power research institute and electric power authorities detection, measuring center, fully passed the ISO9001 international quality management system certification, the licence for manufacturing measuring instruments of the People's Republic of China, GB/T19001-2016 quality management system requirements, GB/T24001-2016 environmental management system requirements, GB/T45001-2020 occupational health and safety management system requirements.
email： info@hvtest.cc
Skype： Tina Qiao
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