CN102981111B - Interturn insulation detector for dry air reactor - Google Patents

Abstract

The invention discloses a dry-air type reactor turn-to-turn insulation detector, which comprises a voltage regulator, a transformer, a high-frequency oscillation module and an oscilloscope. Among them, the voltage regulator adjusts the voltage of the external power supply and transmits it to the transformer; the transformer is connected to the voltage regulator to adjust the transmitted voltage to the range required by the high-frequency oscillation module; the high-frequency oscillation connected to the transformer The module is connected with the reactor to be tested, and the attenuated high-frequency oscillating voltage generated by it acts on the reactor to be tested; the oscilloscope detects the waveform of the oscillating voltage output by the reactor to be tested. When in use, first apply a lower voltage value to the reactor to be tested, and use the oscilloscope to store its waveform; then apply a higher amplitude voltage to the reactor to be tested for one minute, and obtain the output waveform of the reactor again; finally compare the two The insulation performance of the reactor to be tested can be judged by the waveform obtained once, and the purpose of sensitive detection of the insulation defect between turns of the reactor is realized.

Description

Inter-turn insulation tester for dry air reactor

technical field

The invention relates to the technical field of reactor detection, and more specifically relates to a dry air reactor turn-to-turn insulation detector.

Background technique

Compared with traditional oil-immersed iron-core reactors, dry-air reactors (also known as dry-type air-core reactors) have the advantages of simple structure, light weight, small volume, good linearity, low loss and convenient maintenance. Has been developed rapidly and widely used.

The dry air reactor is composed of multiple coaxial winding envelopes. All packages are electrically connected in parallel, and there are several coils connected in parallel in each package, and each layer of coils has several small-section metal wires wound together, and each wire is wrapped with polyester film or glass filament For turn insulation, each envelope is wrapped with a long glass fiber impregnated with epoxy resin. After the reactor is wound, it is heated and solidified, and the entire winding is encapsulated to form a solid whole.

The number of layers and the angle of turns inside the large-capacity dry-air reactor, and the detection of inter-turn insulation faults are always a difficult problem. Frequency doubling and voltage doubling test has a longer action time and higher energy, but the test voltage is lower, and it is difficult to detect defects in reactors with more turns; lightning impulse test voltage is higher, but the action time is shorter and the energy is lower , It is often difficult to judge whether it is qualified by visual inspection or waveform comparison.

From the above, how to provide a dry-air reactor turn-to-turn insulation detector capable of sensitively detecting reactor turn-to-turn insulation defects has become a technical problem urgently needed to be solved by those skilled in the art.

Contents of the invention

In view of this, the present invention provides a dry-air type reactor turn-to-turn insulation detector to achieve the purpose of sensitively detecting reactor turn-to-turn insulation defects.

To achieve the above object, the present invention provides the following technical solutions:

A dry-air reactor turn-to-turn insulation detector, comprising a voltage regulator connected to an external power supply, a transformer connected to the voltage regulator and capable of increasing the output voltage of the voltage regulator, connected to the transformer and able to A high-frequency oscillation module for outputting attenuated high-frequency oscillating voltage from the reactor to be tested and an oscilloscope for detecting the waveform of the oscillating voltage output by the reactor to be tested.

Preferably, in the above-mentioned inter-turn insulation detector for dry-air reactors, the high-frequency oscillation module includes a high-voltage silicon rectifier stack, a high-voltage energy storage capacitor, and a discharge ball gap;

The high-voltage rectifying silicon stack, the high-voltage energy storage capacitor and the transformer are connected in series, the discharge ball gap is connected in parallel with the high-voltage energy storage capacitor, and the reactor to be tested is arranged between the high-voltage energy storage capacitor and the discharge ball gap.

The invention provides a dry-air type reactor turn-to-turn insulation detector, which includes a voltage regulator, a transformer, a high-frequency oscillation module and an oscilloscope. Among them, the voltage regulator adjusts the voltage of the external power supply and transmits it to the transformer; the transformer is connected to the voltage regulator to adjust the transmitted voltage to the range required by the high-frequency oscillation module; the high-frequency oscillation connected to the transformer The module is connected with the reactor to be tested, and the attenuated high-frequency oscillating voltage generated by it acts on the reactor to be tested; the oscilloscope detects the waveform of the oscillating voltage output by the reactor to be tested.

When using the inter-turn insulation detector for dry-air reactors provided by the present invention, first apply a lower voltage value to the reactor to be tested, and use an oscilloscope to store its waveform as a reference; then, adjust the voltage value of the high-frequency oscillating voltage and Frequency, apply a higher amplitude voltage to the reactor to be tested for one minute, and obtain the output waveform of the reactor again; finally, compare the waveforms obtained twice to judge the insulation performance of the reactor to be tested.

Based on the above, the present invention provides a dry air reactor turn-to-turn insulation detector, which realizes the purpose of sensitive detection of reactor turn-to-turn insulation defects.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the schematic diagram of inter-turn insulation detector of dry air type reactor provided by the present invention;

Fig. 2 is a schematic diagram of the high-frequency oscillation module in the turn-to-turn insulation detector of dry air reactor.

Detailed ways

The embodiment of the invention discloses a dry-air type reactor turn-to-turn insulation detector to realize the purpose of sensitive detection of reactor turn-to-turn insulation defects.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1 , the turn-to-turn insulation detector for a dry-air reactor provided by the embodiment of the present invention includes a voltage regulator 1 , a transformer 2 , a high-frequency oscillation module 3 and an oscilloscope 4 .

The voltage regulator 1 is connected to the external power supply, and after adjusting the voltage input by the external power supply, it is sent to the transformer 2 .

The transformer 2 is connected to the voltage regulator 1 , and the transformer 2 readjusts the voltage regulated by the voltage regulator 1 to the voltage value required by the high frequency oscillation module 3 .

The high-frequency oscillation module 3 is connected with the transformer 2, and the attenuated high-frequency oscillation voltage generated by it acts on the reactor to be tested.

The oscilloscope 3 can detect the waveform of the oscillating voltage output by the reactor to be tested.

When using the inter-turn insulation detector of the dry-air type reactor provided by the present invention, the input end of the reactor to be tested is connected to the output end of the high-frequency oscillation module 3, and the output end of the reactor to be tested is connected to the oscilloscope connected. When testing, first apply a lower voltage value to the reactor to be tested, and use the oscilloscope 4 to store its waveform as a reference; then, adjust the voltage value and frequency of the high-frequency oscillating voltage, and apply a higher amplitude voltage to the reactor to be tested for one minute. Voltage, and obtain the waveform of the reactor output again; finally, compare the waveforms obtained twice, and the insulation performance of the reactor to be tested can be judged.

Based on the above, the present invention provides a dry air reactor turn-to-turn insulation detector, which realizes the purpose of sensitive detection of reactor turn-to-turn insulation defects.

Those skilled in the art can understand that when using the above-mentioned inter-turn insulation detector for dry-air reactors to detect reactors, they should follow ANSI/IEEE C57.21-1981 "Requirements and terms for shunt reactors above 500kvar and test specifications.

Specifically, in the inter-turn insulation detector for dry-air reactors provided in the above embodiments, the high-frequency oscillation module 3 includes a high-voltage rectifier silicon stack 30, a high-voltage energy storage capacitor 31, and a discharge ball gap 32, as shown in FIG. 2 .

The high-voltage rectifying silicon stack 30 , the high-voltage energy storage capacitor 31 are connected in series with the transformer 2 , and the discharge ball gap 32 is connected in parallel with the high-voltage energy storage capacitor 31 .

When testing, the reactor to be tested is arranged between the high voltage energy storage capacitor 31 and the discharge ball gap 32 .

When using the inter-turn insulation detector for dry-air reactors provided in this embodiment to test the reactor to be tested, first, use the voltage regulator 1 and the transformer 2 to adjust the voltage applied to the high-frequency oscillation module 3 so that the high-voltage The energy storage capacitor 31 is charged to a specified voltage value, and then the discharge ball gap 32 is slowly adjusted to break down at the preset charging voltage. After the discharge ball gap 32 breaks down, the high-voltage energy storage capacitor 31 discharges to the reactor to be tested through the ball gap arc, so that the reactor to be tested can obtain attenuated high-frequency oscillation voltage.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (1)

1. A dry-air type reactor turn-to-turn insulation detector, characterized in that it comprises a voltage regulator connected to an external power supply, is connected with the voltage regulator and can increase the output voltage of the voltage regulator A transformer, a high-frequency oscillation module connected to the transformer and capable of outputting an attenuated high-frequency oscillation voltage to the reactor to be tested, and an oscilloscope for detecting the waveform of the oscillation voltage output by the reactor to be tested, and the high frequency The oscillation module includes a high-voltage rectifier silicon stack, a high-voltage energy storage capacitor and an adjustable discharge ball gap; The high-voltage rectifying silicon stack and the high-voltage energy storage capacitor are connected in series with the transformer, the discharge ball gap is connected in parallel with the high-voltage energy storage capacitor, and the reactor to be tested is arranged between the high-voltage energy storage capacitor and the high-voltage energy storage capacitor. between discharge balls.