Product Introduction
The series resonance test device manufactures is a specialized equipment that obtains the test voltage by adjusting the power frequency series resonance between the reactor and the sample capacitor. It consists of a variable frequency power supply, excitation transformer, reactor, capacitive voltage divider, and compensation capacitor. The high voltage resonant test system factory measures the voltage of the test object through a voltage divider and provides overvoltage protection. It is mainly used for AC withstand voltage testing and partial discharge detection of power cables, generators, GIS switches, transformers and other equipment.
Product functions
AC withstand voltage testing
Used for AC withstand voltage testing of high-voltage electrical equipment such as power cables, GIS, transformers, and generators, to evaluate the insulation withstand capability of the equipment.
Partial discharge detection
Used to identify potential internal insulation defects in equipment, such as insulation aging, air gaps, and local weak points.
Automatic tuning and frequency sweeping
Automatically searches for the optimal resonant frequency and completes system tuning, improving test efficiency. Also supports manual tuning and manual voltage boosting.
High-voltage output and real-time measurement
Generates stable high test voltage through series resonance, and measures and monitors test voltage in real time.
Multiple safety protections
Features overvoltage, overcurrent, zero-start, and flashover/breakdown protection functions. In the event of abnormalities, it quickly protects both the equipment and the test object, and can record flashover voltage.
Main components of the device
Serial number | Cihaz adı | Specification and model | Birim | Quantity |
1 | Variable frequency power supply | UHV-15kW | Tower | 1 |
2 | Uyarma transformatörü | UHV-4kVA/1.5/3/6kV/0.4kV | Tower | 1 |
3 | High voltage reactor | UHV-67.5kVA/27kV | Section | 4 |
4 | Capacitive voltage divider | UHV-1500pF/110kV | Ayarlamak | 1 |
Main technical parameters and functions
Değerlendirilmiş kapasite | 270kVA |
Nominal gerilim | 27kV；54kV；108kV |
Anma akımı | 10A；5A；2.5A |
Ölçüm doğruluğu | System RMS level 1.5 |
Operating frequency | 30-300Hz |
Device output waveform | Sinusoidal wave |
Kalite faktörü | Device Q≥30(f=45Hz) |
Dalga biçimi bozulma oranı | Output voltage waveform distortion ≤1% |
Giriş güç kaynağı | Single-phase 220 or three-phase 380V voltage, frequency 50Hz |
Working hours | Allow continuous 60min under rated load; Overpressure 1.1 times 1 minute |
Sıcaklık artışı | Temperature rise ≤65K after continuous operation under rated load for 60 minutes |
Protection function | Overvoltage, overcurrent, zero start, system mismatch (flashover) and other protection functions |
Ortam sıcaklığı | －20℃-55℃ |
Bağıl nem | ≤%90 bağıl nem |
Rakım | ≤3000m |
Product Features:
The main functions and technical characteristics of the frequency-modulation resonance device of our company:
1, the high voltage resonant test equipment has overvoltage, overcurrent, zero start, system mismatch (flashover) and other protection functions, overvoltage and overcurrent protection value can be adjusted according to user needs, flashover protection action when the test product flashover and can record the flashover voltage value for test analysis.
2, the whole device single weight is very light, easy to use on site.
3, the resonant test device has three working modes: automatic mode, manual mode, automatic tuning manual boost mode; Convenient for users to flexibly choose according to the field situation, improve the test speed.
4, the resonant test equipment supplier can store and remote print data, stored data number is a number, easy for users to identify and find.
5, when the device automatically sweeps the frequency starting point can be arbitrarily set within the specified range, the scanning direction can be selected up and down, and the LCD large screen displays the scanning curve, which is convenient for users to intuitively understand whether to find the resonance point.
6, the use of DSP platform technology, according to user needs to increase or decrease the function and upgrade, human-machine exchange interface is more humane.
7, the required power capacity is greatly reduced. Series resonant power supply is the use of resonant reactor and the test product capacitor resonance to produce high voltage and high current, in the whole system, the power supply only needs to provide the active power consumption of the system, so the power required for the test is only 1/Q of the test capacity.
8, the weight and volume of the equipment are greatly reduced. In the series resonant device, the bulky high-power voltage regulator and the ordinary high-power power frequency test transformer are omitted, and the resonant excitation power supply only needs 1/Q of the test capacity, which greatly reduces the weight and volume of the system, generally 1/10-1/30 of the ordinary test device.
9, effectively improve the output voltage waveform. The resonant power supply is a resonant filter circuit, which can improve the waveform distortion of the output voltage, obtain a good sinusoidal waveform, and effectively prevent the harmonic peak to the test product.
10, prevent large short circuit current burn fault point. In the series resonance state, when the insulation weakness of the test product is broken down, the circuit is immediately detuned, the loop current rapidly drops to 1/Q of the normal test current, and when the parallel resonance or test transformer is used for voltage resistance test, the breakdown current immediately rises dozens of times, compared with the two, the short circuit current and the breakdown current are hundreds of times different. The series resonance can effectively find the insulation weakness, and there is no large short-circuit current burn fault point worry.
11, No recovery overvoltage will occur. When the test product breaks down, due to the loss of resonance conditions, the high voltage also immediately disappears, the arc is immediately extinguished, and the re-establishment process of the recovery voltage is very long, it is easy to disconnect the power supply before reaching the flashover voltage again, the recovery process of this voltage is a kind of intermittent oscillation process of energy accumulation, its process is long, and there will be no recovery overvoltage.
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Product Comparison
Comparing dimensions | Series resonance | Power frequency transformer | Very low frequency (0.1Hz) |
Core Advantages | Lightweight power supply, no impact during breakdown, good equivalence | Absolute frequency, pure waveform | Extremely lightweight and safe for low voltage operation |
Fatal weakness | High equipment cost and high requirements for variable frequency power supply | Extremely bulky, breakdown can burn the test sample | Long testing time and not recognized by all standards |
Who is most suitable for | 220kV and above cables, GIS switches | Transformers and insulators below 10kV | Quick troubleshooting of medium and low voltage cables (length ≤ 5km) |
Application Areas
Power cable testing
Used for AC withstand voltage testing and partial discharge detection of high-voltage and extra-high-voltage power cables, suitable for cable commissioning tests, preventive tests, and other applications.
GIS equipment testing
Used for AC withstand voltage and insulation performance testing of gas-insulated switchgear (GIS).
Transformer testing
Used for AC withstand voltage testing of large power equipment such as transformers, to verify the reliability of the equipment's insulation system.
Generator testing
Used for AC withstand voltage testing of generators and related high-voltage windings, to inspect their insulation performance.
Power engineering on-site testing
Suitable for equipment commissioning tests, preventive tests, and maintenance tests at substations, power plants, new energy power stations, and other power engineering sites.
Electrical equipment manufacturing and inspection
Suitable for high-voltage electrical equipment manufacturing enterprises, used for factory acceptance tests, quality inspection, and insulation performance verification.
FAQs
Q: What factors will affect the results of the series resonant cable withstand voltage test?
A: Mainly includes cable parameters (length, capacitance), test voltage, environmental conditions (temperature, humidity), and stability of testing equipment.
Q: Apart from voltage withstand testing, what other methods can be used to evaluate cable insulation?
A: Partial discharge detection, dielectric loss testing, DC withstand voltage testing, and other commonly used methods can reflect insulation status from different dimensions.
Q: How to ensure the accuracy of the series resonant cable withstand voltage test?
A: It is necessary to accurately measure cable parameters, select appropriate test frequencies and voltages, use high-precision testing equipment, and strictly follow operating procedures.
About us
Wuhan UHV Power Technology Co., Ltd. was established in 2021 and is situated in the Wuhan East Lake High-tech Development Zone, enjoying a highly convenient location. As a professional OEM manufacturer, we focus on the research, development, sales, and service of high-voltage testing instruments.
We are a professional high voltage resonant test system manufacturers in China.We can provide the best professional high voltage resonant test system for sales and competitive price. If you are looking for high voltage resonant test system supplier, we are a good choice.
Contact us to get high voltage resonant test system price.
