What are the characteristics of RLC series resonant circuit? Wuhan UHV specializes in producing series resonant devices, with a wide range of product selection and professional electrical testing. When looking for series resonant devices, choose Wuhan UHV.
Advantages of RLC series resonant power supply in power system applications:
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 1/5-1/10 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 short-circuit current, the breakdown current differs by hundreds of times. 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.
Main features of the product:
1. The frequency modulation and power components use the most advanced high-quality components imported from Japan;
2. Fully utilize the company's existing resources and independently develop, design, and produce all components of the equipment, including variable frequency power supply, excitation transformer, high-voltage reactor, capacitor compensator, and high-precision capacitor voltage divider;
3. It has multiple functions including fully automatic (automatic tuning, automatic boosting), fully manual (manual tuning, manual boosting), and semi-automatic (automatic tuning, manual boosting, and manual tuning, automatic boosting), and can be switched and used freely;
4. Equipped with settings for test voltage, pressurization time, alarm current setting, alarm voltage setting, frequency range, and starting voltage;
5. Equipped with discharge protection function, in the event of flashover of the test sample or sudden loss of resonance in the resonant circuit caused by other reasons, the variable frequency control power supply will immediately automatically and quickly cut off the output, and display the protection type and flashover voltage value;
6. Measure and display relevant information such as output voltage, output frequency, pressurization time, and protection action type. The voltage will automatically drop to zero upon completion of the test;
7. Large LCD interface platform technology, full touch screen operation, data storage
8. Summary of Technical Characteristics and Key Points:
8.1. Advanced digital and power technology: The power device adopts the latest intelligent power module (IPM) introduced abroad, which integrates drive, protection, and power conversion, greatly improving the reliability of the whole machine and reducing volume and weight.
8.2. Complete protection function: overvoltage protection: protection value can be set, action time is less than 1 millisecond; Dual overcurrent and overheating protection: combining self-protection of high-power devices with software protection, with an action time of less than 10 microseconds; Flashover protection: The action time is less than 1 millisecond and the flashover voltage value can be recorded; Zero position protection: zero voltage start.
8.3. Unique four working modes: manual test: manually finding the resonance point and manually boosting it to the required voltage, automatic timing after pressing the button; Automatic test: Automatically search for the resonance point according to the settings, then automatically rise to the set voltage and start timing automatically; Automatic tuning and manual boosting: After automatically finding the resonance point according to the settings, the voltage needs to be manually raised to the desired value, and the "automatic timing" button will be pressed to automatically time; Manual tuning of automatic boost: manually search for the resonance point, and automatically time up after automatic boost according to the settings.
8.4. Friendly human-machine interface: dedicated DSP display platform, large capacity data storage, large screen LCD display; Rich assistance application information to help you analyze potential issues that may arise during protective actions during on-site testing; Can save 200 test data times; Display the frequency voltage waveform curve during frequency modulation, allowing for intuitive observation of whether a resonance point has been found; The scanning range can be set arbitrarily within the specified range, and the scanning direction can be selected up or down, making it convenient for users to operate; For samples that require testing under 50Hz conditions (such as generators), we use frequency and inductance modulation technology. Our reactor inductance value can be adjusted appropriately according to the testing needs, and the clamping device can ensure the reduction of reactor noise when powered on;
8.5. Unique structural design: The access and output of the FM power control box are connected by plug and screw, which is safe, convenient, reliable, beautiful and exquisite; The reactor adopts a unique epoxy casting process to prevent moisture and shock; The overall color and appearance are specially designed by a professional design company, which is beautiful and elegant.