CN213364949U

CN213364949U - Device for detecting insulating property of air-core reactor

Info

Publication number: CN213364949U
Application number: CN202022340859.0U
Authority: CN
Inventors: 刘骥; 杨帆; 王守明
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-06-04
Anticipated expiration: 2030-10-20

Abstract

The utility model provides a detect device of air-core reactor insulating properties, the utility model relates to a detect device of air-core reactor insulating properties belongs to high voltage power equipment and detects technical field. The device comprises a frequency conversion controller UC and an air reactor insulation detection circuit; the frequency conversion controller UC is used for outputting 400Hz sine wave voltage to supply power to the air reactor insulation detection circuit; the air reactor insulation detection circuit is used for detecting the insulation performance of the air reactor; the output end of the frequency conversion controller UC is connected with the input end of the air reactor insulation detection circuit; the utility model discloses a binary channels ADC sampling for contravariant output time triggers the ball crack ignition time more in coordination with the over-and-under type, realizes 3000 pulse shock tests in 1min, thereby reaches the requirement of examination voltage in the standard.

Description

Device for detecting insulating property of air-core reactor

Technical Field

The utility model relates to a detect device of air-core reactor insulating properties belongs to high voltage power equipment and detects technical field.

Background

The air reactor has the advantages of high mechanical strength, small eddy current loss, linear current change, stable inductance value and the like, so that the air reactor is very commonly applied to a power system. In recent years, with the increase of the complexity of a power system network, faults of various air-core reactors frequently occur, the stable operation of a power grid is directly influenced, and the reduction of the turn-to-turn insulation performance of the air-core reactor is a main cause of the faults from the known fault types. Therefore, it is necessary to design a device for detecting the insulating property of the air-core reactor.

The traditional method for detecting the air-core reactor mostly adopts a lightning impulse test. Practice proves that the lightning impulse test cannot effectively judge whether the insulation performance of the lightning impulse test is changed or not because the test times and the action time are short. The IEEE recommends that the pulse oscillation voltage method is adopted for measurement, and corresponding standards are given. In the domestic standard requirement, 3000 times of high-voltage oscillation attenuation pulses are continuously applied to the reactor under the power frequency of 50Hz to test the excellence of the turn-to-turn insulation performance of the reactor. In this way, it is possible to detect a faulty air reactor that is not detected by the lightning impulse method. But the equipment is controversial due to the problems of large volume, difficult transportation and the like.

Therefore, it is very important to develop a device for the insulation performance of the air reactor, which has a small volume, high detection efficiency and a stable detection process.

SUMMERY OF THE UTILITY MODEL

The present invention has been developed in order to solve the above-mentioned problems, and a brief summary of the present invention is provided below in order to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.

The technical scheme of the utility model:

a device for detecting the insulating property of an air reactor comprises a frequency conversion controller UC and an air reactor insulating detection circuit;

the frequency conversion controller UC is used for supplying power to the air reactor insulation detection circuit;

the output end of the frequency conversion controller UC is connected with the input end of the air reactor insulation detection circuit;

the air reactor insulation detection circuit comprises a current-limiting resistor R, a corona-free experimental transformer T, a high-voltage rectifier silicon stack D, a high-voltage resistance-capacitance voltage divider, a high-voltage resistance-voltage divider, a spherical gap G, a main capacitor C and an air reactor LX to be detected;

the current-limiting resistor R is connected in series with the primary side of the corona-free experimental transformer T, the anode of the high-voltage rectifying silicon stack D is connected to the secondary side of the corona-free experimental transformer T, the cathode of the high-voltage silicon stack D is connected with the air reactor LX to be tested through the main capacitor C, the air reactor LX to be tested is connected with the secondary side of the corona-free experimental transformer T, the high-voltage resistance-capacitance voltage divider is connected in parallel with two ends of the tested electric reactor LX, the high-voltage end RH of the high-voltage resistance-capacitance voltage divider is connected with the cathode of the high-voltage rectifying silicon stack D, the low-voltage end RL of the high-voltage resistance-capacitance divider is connected with the secondary side of the corona-free experimental transformer T, the high-voltage end of the spherical gap G is connected with the high.

Preferably, the frequency conversion controller UC includes a three-phase power supply S, a filter inductor Q, a rectification circuit X, and an inverter circuit Y; the input end of the three-phase power supply S is connected with a filter inductor Q, a buffer resistor Ra, a buffer resistor Rb and a buffer resistor Rc, the output end of the three-phase power supply S is connected with a rectification circuit X through the buffer resistor Ra, the buffer resistor Rb and the buffer resistor Rc, a voltage stabilizing capacitor C1 is connected between the rectification circuit X and an inverter circuit Y, and the inverter circuit Y is connected with a current limiting resistor R.

Preferably, the high-voltage resistance-capacitance voltage divider and the high-voltage resistance-capacitance voltage divider form a dual-channel ADC sampling.

Preferably, the high-voltage resistor voltage divider is connected to the variable frequency controller UC.

Preferably, the high-voltage resistor-capacitor voltage divider is connected to the frequency conversion controller UC.

Preferably, the low-voltage end of the spherical gap G is connected to a frequency conversion controller UC.

Preferably, the high-voltage resistor-capacitor voltage divider and the high-voltage resistor-capacitor voltage divider are grounded at a single point.

Preferably, the spherical gap G and the air core reactor LX to be tested are grounded at a single point.

Preferably, the frequency conversion controller UC further includes a control unit MCU, one end of the control unit MCU is connected to the interface of the upper computer, and the other end of the control unit MCU is connected to the inverter circuit Y.

The utility model discloses following beneficial effect has:

the variable frequency power supply module is connected with a no-corona experimental transformer, and under the condition of meeting the capacity, the 400Hz inversion output frequency is set, so that 3000 pulse oscillation tests within 1min are realized. Thereby meeting the requirement of the examination voltage in the standard. And adopt the two-channel ADC sampling for contravariant output time and ball clearance ignition time go on more in coordination. The utility model relates to a detect hollow reactor insulating properties's device can be used to the detection of the hollow reactor insulating properties of different specifications, can discover the insulating defect and the trouble that equipment finished product and semi-manufactured goods exist effectively. The inverter outputs 400Hz sine wave voltage, and the main capacitor is charged through the half-wave rectification structure, so that the charging process is faster, and the pulse oscillation process is more stable.

Drawings

FIG. 1 is a schematic diagram of an air core reactor insulation detection circuit;

fig. 2 is a schematic overall view of an internal structure of the frequency conversion controller UC;

in the figure, a UC-frequency conversion controller, an R-current limiting resistor, a T-corona-free experimental transformer, a D-high-voltage rectifier silicon stack, a ZH-high-voltage resistor-capacitor voltage divider high-voltage end, a ZL-high-voltage resistor-capacitor voltage divider low-voltage end, an RH-high-voltage resistor voltage divider high-voltage end, an RL-high-voltage resistor voltage divider low-voltage end, a G-ball gap, a C-main capacitor, an LX-air reactor to be tested, an S-three-phase power supply, a Q-filter inductor, an X-rectifier circuit, a Y-inverter circuit, an Ra-buffer resistor, an Rb-buffer resistor, an Rc-buffer resistor and a C1-.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The first embodiment is as follows: in an embodiment, referring to fig. 1-2 to describe this embodiment, in the apparatus for detecting an insulation performance of an air-core reactor according to this embodiment, the current-limiting resistor R is connected in series with a primary side of a corona-free experimental transformer T, an anode of the high-voltage rectifying silicon stack D is connected to a secondary side of the corona-free experimental transformer T, the high-voltage resistive-capacitive voltage divider is connected in parallel with two ends of a measured reactor LX, and the high-voltage resistive-capacitive voltage divider form a dual-channel ADC sampling, so that an inversion output time and a spherical gap G ignition time;

the high-voltage end of the high-voltage resistor voltage divider is connected with the cathode of the high-voltage rectifier silicon stack D, and the high-voltage end of the lifting spherical gap G is connected with the high-voltage end of the resistor voltage divider.

The control unit MCU is connected with the high-voltage resistance voltage divider, the high-voltage resistance-capacitance voltage divider and the low-voltage end of the ball gap G to collect voltage;

the variable frequency controller comprises a three-phase power supply S, a filter inductor Q, a rectifying circuit X and an inverter circuit Y; the input end of the three-phase power supply S is connected with a filter inductor Q and a buffer resistor R, the output end of the three-phase power supply S is connected with a rectifying circuit X through the buffer resistor R, a voltage stabilizing capacitor C1 is connected between the rectifying circuit X and an inverter circuit Y, and the inverter circuit Y is connected with a current limiting resistor R; the control unit MCU controls the three-phase power supply S to output three-phase 50Hz alternating current to the three-phase rectifying circuit X, the three-phase rectification circuit X converts 50HZ alternating current into direct current, the direct current is converted into 400Hz alternating current through the inverter circuit Y to supply power to the air reactor insulation detection circuit, the voltage is increased to a required voltage value through a no-corona test transformer T, a main capacitor C is charged on the secondary side of the no-corona test transformer T through a rectifier silicon stack D to 1/4 full wave cycle time, the ignition switch of the ball gap G is controlled at the time point, the electric breakdown of the upper and lower ball gaps G is realized based on the principle of streamer discharge, after the breakdown of the ball gaps G, the main capacitor C and the tested air core reactor XL form a zero input state of a second-order circuit, when the impedance of the whole loop is under-damped, the loop presents pulse oscillation response, and further the detection of the insulating property of the air reactor is completed; the purpose of such a connection is: the rectifying circuit plays a role in restraining peak current, and the controllable buffer resistor plays a role in restraining opening current. When the insulation performance of the air core reactor is detected, the overvoltage oscillation frequency of the reactor to be tested is related to the inductance values of the main capacitor C and the reactor LX to be tested, and if the insulation performance of the reactor is good, the oscillation frequency of the voltage waveform detected by the high-voltage resistance-capacitance voltage divider is consistent front and back, and the zero-crossing points of the two waveforms are coincident. If the insulation performance of the reactor is reduced or inter-turn defects occur, the oscillation frequencies of the front voltage waveform and the rear voltage waveform of the high-voltage resistance-capacitance voltage divider are inconsistent, zero-crossing points are not overlapped any more, and the reactor is indicated to have faults. The control unit MCU is connected with the high-voltage resistance voltage divider, the high-voltage resistance-capacitance voltage divider and the low-voltage end of the spherical gap G, collects voltage and displays the voltage through an upper computer interface.

It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore the present invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the present invention.

This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.

Claims

1. The utility model provides a detect device of air-core reactor insulating properties which characterized in that: the device comprises a frequency conversion controller UC and an air reactor insulation detection circuit;

2. The device for detecting the insulation performance of the air core reactor according to claim 1, is characterized in that: the frequency conversion controller UC comprises a three-phase power supply S, a filter inductor Q, a rectifying circuit X and an inverter circuit Y; the input end of the three-phase power supply S is connected with a filter inductor Q, a buffer resistor Ra, a buffer resistor Rb and a buffer resistor Rc, the output end of the three-phase power supply S is connected with a rectification circuit X through the buffer resistor Ra, the buffer resistor Rb and the buffer resistor Rc, a voltage stabilizing capacitor C1 is connected between the rectification circuit X and an inverter circuit Y, and the inverter circuit Y is connected with a current limiting resistor R.

3. The device for detecting the insulation performance of the air core reactor according to claim 1, is characterized in that: and the high-voltage resistance voltage divider and the high-voltage resistance-capacitance voltage divider form a dual-channel ADC (analog to digital converter) for sampling.

4. The device for detecting the insulation performance of the air core reactor according to claim 1, is characterized in that: the high-voltage resistor voltage divider is connected with a frequency conversion controller UC.

5. The device for detecting the insulation performance of the air core reactor according to claim 1, is characterized in that: the high-voltage resistance-capacitance voltage divider is connected with a frequency conversion controller UC.

6. The device for detecting the insulation performance of the air core reactor according to claim 1, is characterized in that: and the low-voltage end of the spherical gap G is connected with a frequency conversion controller UC.

7. The device for detecting the insulation performance of the air core reactor according to claim 1, is characterized in that: the high-voltage resistance-capacitance voltage divider and the high-voltage resistance-capacitance voltage divider are grounded in a single point mode.

8. The device for detecting the insulation performance of the air core reactor according to claim 1, is characterized in that: and the spherical gap G and the tested air core reactor LX are grounded in a single point.

9. The device for detecting the insulation performance of the air core reactor according to claim 2, is characterized in that: the frequency conversion controller UC further comprises a control unit MCU, one end of the control unit MCU is connected to the interface of the upper computer, and the other end of the control unit MCU is connected to the inverter circuit Y.