What are the characteristics of generator AC withstand voltage test device frequency conversion mod

Product Introduction. The generator AC withstand voltage test device (frequency conversion inductance) is mainly designed and manufactured for the AC withstand voltage test of 11kV 30MW hydro generator. The reactor is designed separately The device is mainly composed of a frequency conversion control power supply, an excitation transformer, a reactor and a capacitor voltage divider.

The generator AC withstand voltage test requires the use of power frequency voltage, the current national standard defines the frequency of power frequency voltage as 45hz 65hz, but in many test occasions, the generator is required to carry out the AC test of 50hz 2 Hz, and the generator stator winding to the ground capacitance is relatively large, most of the domestic test units use the resonant transformer to test it, but the resonant transformer itself is very heavy, often on the ton, the field test is very inconvenient. In view of this, our company has designed and manufactured an AC withstand voltage resonance test device for frequency modulation generators. This series of devices can not only adjust the inductance of the reactor to achieve the resonant state, but also can adjust the working frequency of the system to achieve the resonant state, and can also use the above two ways to achieve the resonant state at the same time.

When what frequency is needed to do the test, the frequency of the excitation source is adjusted to the required frequency, and then the inductive reactance of the reactor is adjusted according to the capacitance of the tested product, so that the system resonates and generates high voltage.

Compared with similar devices of AC withstand voltage of generators in China, this series of devices has a variety of revolutionary technical advantages:

1.The overall weight of the equipment is greatly reduced when the generator AC withstand voltage test with the same voltage level and capacity is done, and the weight of a single piece of equipment is less than 60 kg, which completely solves the problem of on-site handling difficulties;

2.The whole set of equipment has advanced principles, and at the same time, new frequency modulation and inductance modulation technology is applied to strictly ensure the power frequency withstand voltage test requirements of generators; The wide range of application greatly enhances the use value of the equipment;

3.Equipped with 20Hz 300Hz frequency conversion control source, its protection function is strong, the output waveform is good, the stability is good, it has a variety of working modes, it is easy to operate, and it adopts two kinds of power supply of 220V or 380V, which is convenient for on-site power;

4.The induction adjustment and then frequency modulation method can accurately find the maximum Q point and avoid the resonance deviation caused by voltage rise.

5.Flexible configuration and strong expansion function. Different types of reactors can be selected or multi-cell series and parallel connection can be used to meet the test requirements of all capacitive samples of the power system; At the same time, it can meet the occasion of power frequency test and the occasion of frequency conversion test; The device can not only do the AC withstand voltage test of the generator, but also can do the AC withstand voltage test of the cable, so as to realize the multi-purpose of one machine and the high cost performance.

Using the principle of series resonance, the excitation transformer is used to excite the series resonance loop, and the output frequency of the frequency conversion controller is adjusted, so that the loop inductance L and the sample C resonate in series, and the resonant voltage is the voltage added to the sample. It is widely used in electric power, metallurgy, petroleum, chemical and other industries, and is suitable for the handover and preventive test of large-capacity and high-voltage capacitive test samples.

UsageGenerator AC withstand voltage test device is mainly used in the following aspects:

KV-500KV high-voltage cross-linked cable AC withstand voltage test 2, generator AC withstand voltage test.

3. AC withstand voltage test of GIS and SF6 switches.

Power frequency withstand voltage test of KV-500kV transformer 5, AC withstand voltage test of other power high-voltage equipment such as busbar, bushing, transformer.

The complete set of variable frequency series resonant equipment is composed of variable frequency power supply, excitation transformer, reactor and voltage divider.

Main technical features:

One of the few in the country has passed the strict type test appraisal of the national authoritative department - the Electric Power Industry Electrical Equipment Quality Inspection and Testing Center (Wuhan High Voltage Research Institute), with reliable quality and ensuring the safety of test personnel, tested products and test equipment itself;

Small size, light weight, especially suitable for on-site use;

In line with the requirements of the national standard: it has the function of monitoring peak 2, which can monitor the test waveform in real time;

Overvoltage, overcurrent, discharge, overtemperature and zero-start protection are comprehensive and reliable, and the action time is 1 microsecond;

The equipment comes with a micro printer, which can print and save the test data in time;

Designed according to military standards for vibration resistance and dustproof, resistant to long-distance transportation and harsh use environments;

One-key mouse knob "fool-style" operation, large-screen LCD display;

The unique software calibration function is convenient for users to calibrate the meter and ensure the accuracy of high voltage values;

German Rittal designed all-aluminum alloy chassis, vertical and lying dual-purpose, lightweight and beautiful, greatly convenient for on-site use;

All major components are imported by world-renowned enterprises, including Texas Instruments, Intel, Siemens, Schneider, Toshiba, Fujifilm, etc.;

The product is stable and reliable, with a three-year warranty;

Keep promises, provide professional and timely service, and do our best to serve customer needs;

1. The AC withstand voltage test is to identify the dielectric strength of power equipment.

Because the AC withstand voltage test voltage is generally higher than the operating voltage, after passing the test, the equipment has a large safety margin, so the AC withstand voltage test is an important means to ensure the safe operation of power equipment.

2. The DC withstand voltage test is to investigate the maximum voltage peak value of the equipment under the high voltage test, so as to determine the range of use of the equipment and the range of the equipment.