Inductive AC Series Resonance Test System
Adjustable power frequency series resonance withstand voltage device, the operating system of the adjustable power frequency series resonance withstand voltage device can not only adjust the voltage and inductance, but also monitor the power factor, high side current, high voltage test voltage, and low voltage of the loop in real time. The rising and falling values of output voltage and air gap are protected against overcurrent and overvoltage.
This product adopts adjustable reactor to adjust the inductance of the reactor to reach the resonance state, and it can also use the method of adjusting the working frequency of the system to reach the resonance state. When the frequency is needed for the test, the frequency of the excitation source is adjusted to the required frequency. Then adjust the inductive reactance of the reactor according to the capacitance of the tested product to make the system resonate and generate high voltage. During the boost process, how to resonate higher, you can accurately find the resonant point by fine-tuning the frequency to ensure a high Q value. Thereby greatly reducing the electrical capacity and the volume and weight of the test equipment.
With the development of the power system, the capacity of operating equipment is getting larger and larger. For example, the single unit capacity of thermal power generating sets has exceeded 1000MW, and the maximum capacity of single unit of hydropower generating sets has reached 800MW. The AC power frequency withstand voltage test of these equipments, if used The traditional test equipment (ie, power frequency test transformer), due to the large capacity required for the test, the test transformer and the voltage regulator are very bulky, and the large-capacity test power supply is difficult to solve in the field, and the field test is extremely inconvenient. The power frequency resonance device has great advantages in terms of test power supply capacity, equipment weight, test waveform and investment. The device is mainly designed and manufactured for the AC withstand voltage test of hydroelectric generators with a single unit capacity of 250MW and below.
The advantage is that the test voltage applied under such conditions is more suitable for the operating frequency of the tested equipment.
We can also supply the variable frequency series resonance test device for which the inductance cannot be changed, but the series resonance can be achieved by adjusting the frequency.
1. Counter-attack over-voltage and transmission over-voltage protection: This device uses proper wiring, complete protection links and step-by-step absorption of energy to prevent counter-attack over-voltage and transmission over-voltage. After years of field practice, it has been proved that the test product can avoid the whole set of test equipment and the test personnel on the spot from being infringed and threatened by overvoltage during flashover or breakdown. At the same time, it can also prevent the failure point of the tested product from expanding damage after flashover or breakdown.
2. Small size, light weight, convenient installation and transportation, simple wiring, very suitable for the operation of on-site personnel.
3. The main functions of the inductive resonance device are：
(1) Direct reading function of reactor core gap:
This device is equipped with a gap observation hole on the reactor, which can directly read the gap of the iron core to guide the operation. In addition, a gap limit switch and instructions are installed.
(2) Withstand voltage time to automatic pressure reduction function:
The withstand voltage timer adopts a digital display timer. And when the withstand voltage time is reached, the system will automatically reduce the pressure
(3) Zero-position closing, zero-up boost function:
It has a zero position limit function. If the voltage regulator is not in the zero position, the high-voltage output button cannot be closed to ensure that the system is boosting from zero.
(4) Overcurrent protection function:
The system is equipped with an electromagnetic over-current relay. This relay has strong anti-interference ability and quick action to prevent the test product from being damaged by over-current.
(5) Overvoltage and test product flashover protection function:
The device is equipped with an electronic overvoltage flashover protection board to prevent the test product from being damaged by overvoltage and flashover, and the action is rapid.
(6) Real-time monitoring function of each test data:
The voltage and current on the high-voltage side and the voltage and current on the low-voltage side can be monitored, and the test situation can be more intuitively understood.
