CN216285508U

CN216285508U - Transformer detection equipment

Info

Publication number: CN216285508U
Application number: CN202121829622.7U
Authority: CN
Inventors: 龚宇佳; 袁田; 伍罡; 杨国泰; 应斯; 王昱晴; 王欣盛; 童悦; 王�琦; 张锦; 邓先生; 黄小华; 魏志雄; 张明; 齐青峰; 金亮; 姚艺新; 王知黎
Original assignee: China Electric Power Research Institute Co Ltd CEPRI
Current assignee: China Electric Power Research Institute Co Ltd CEPRI
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2022-04-12
Anticipated expiration: 2031-08-06

Abstract

The utility model discloses a transformer detection device, which comprises: the variable frequency power supply is connected with the integrated measurement and control device and is used for providing power for the integrated measurement and control equipment; and the integrated measurement and control device is connected with the transformer to be detected and used for outputting a preset voltage signal to the transformer to be detected and detecting the transformer to be detected according to the operation data of the transformer to be detected. The transformer detection equipment has the test capability of a 10kV-500kV voltage class transformer; the test capability of a 60Hz product can be performed while the test capability of a 50Hz transformer is met; the partial discharge test capability is met, and the partial discharge problem of the IGBT power supply is solved; the set of variable frequency power supply can replace the original voltage regulator, power frequency generator set and intermediate frequency generator set; the highly integrated measurement reduces the error and uncertainty of the measurement loop.

Description

Transformer detection equipment

Technical Field

The utility model relates to the technical field of transformer detection, in particular to transformer detection equipment.

Background

The vigorous development of the power industry promotes the rapid increase of the demand of power transmission and transformation equipment, the technical performance requirements of the power transmission and transformation equipment are higher and higher, and a transformer is basic equipment for power transmission and distribution and is widely applied to the fields of industry, agriculture, traffic, urban communities and the like. For transformer production enterprises, the test of the transformer is an important link for controlling and ensuring the product quality in the manufacturing process; for the detection department, a perfect transformer test system is one of important means for supervising transformer products delivered from factories of production enterprises, so that the investment of test stations and equipment is a key link to be considered when factory construction and detection center construction are carried out.

The construction cost of the test station is mainly the site and equipment cost of the test station and the manpower and electric power cost in later use. The field and the equipment are one-time investment cost, the later-stage manpower and electric power cost is long-term continuous investment, and the method belongs to the cost expenditure major items of enterprises and detection centers. The conventional routine test projects of the transformer mainly comprise a space load test, a load test, an induction withstand voltage test, a partial discharge measurement, a power frequency withstand voltage test, a lightning impulse test and the like, and the conventional equipment allocation idea is continued in the construction of the conventional test station at present. Particularly, power supply equipment adopted in an empty load test and an induction voltage withstand test is mainly in a combined mode of an induction voltage regulator and a medium-frequency generator set, and meanwhile, a power frequency voltage withstand test is independently configured in a contact type voltage regulation mode. The entire test station area occupies 200-400m2 of the production plant. The test station is an indispensable area site in the construction of the current test station, most areas are occupied by equipment rooms and control rooms basically, the test articles to be tested and the test completion products in the test area also occupy most areas due to the problem of circulation efficiency, and the area really used for the test is not large. The induction voltage regulator, the intermediate frequency generator and the column voltage regulator selected by the traditional equipment have large body structure sizes and need to be configured with special sites for placement; secondly, the generator set has large noise during operation and must be placed in an independent room and far away from a control room and an office area; thirdly, only a great deal of power supply equipment is provided with a power frequency voltage-resistant column voltage regulator and the like, and the normal operation of the whole test station can be met only by professional equipment design and construction due to the fact that one-time circuit switching, a complex control system, a cable routing groove and the like of the whole system are needed. Therefore, the test station has very high requirements on the specialization degree of the equipment room, occupies a large production workshop area, and has high construction requirements and high construction cost.

The traditional power supply equipment (voltage regulator, generator set and the like) has more control components and poor uniformity, for example, the induction voltage regulator is controlled by an alternating current motor; the column type voltage regulator is controlled by a direct current motor; the control of the excitation of the generator set is more diverse. Poor standardization is a relatively special feature, which makes later maintenance difficult. For example, in a no-load test of a 10/0.4kV equivalent transformer, a test voltage of 400.0V is generally required as an optimal test point, but it is relatively difficult to adjust the voltage to 400 ± 0.5V through an induction voltage regulator in an actual test, and this is still under the condition of configuring an up-conversion voltage regulation, the accuracy of the test voltage can be satisfied as much as possible only through an instant capture mode, but in an actual application, due to the difference of excitation characteristics of a measuring instrument and a tested product, a certain aging error exists in the instant capture mode more or less. In actual tests, different test items are generally performed in a cross mode, so that equipment needs to be frequently switched once, and particularly, a generator set may need to be frequently started/stopped.

Firstly, the loss problem of the induction voltage regulator, as is known to be large in no-load loss and load loss of the induction voltage regulator, a lot of electric energy is wasted invisibly during the test, especially during the temperature rise test. The generator has high requirement on the capacity of a power supply of equipment, and the generator set needs to consider at least 3-4 times of rated current when starting, so that higher requirements are provided for the capacity of the power supply of a whole factory workshop, the equipment, the length and the specification of a loop cable and the like, and the construction investment cost is increased invisibly. When the large-capacity generating set is used, the time of more than 30min-1h is generally needed only when the generating set is started, and the large-size generating set does not support frequent starting, so that the generating set is started when a factory is on duty every day, the real test time every day is generally between 1-3 hours, and the rest time is basically idle. For example, the capacity of a power frequency generator set of a 220kV test station in China is 30MVA, the power of a motor is 5000kW, and if the power is calculated according to the complete no-load, the running power of the generator set is about 1500kW, so that the power consumption of only one power frequency generator set is about 1000 ℃ in the starting process. Not only is the cost of electricity wasted in this process, but also the cost of labor and time is wasted more. Particularly serious is that in order to meet the normal test function, a large-scale test station generally constructs at least one set of power frequency generator set and at least one set of intermediate frequency generator set. From the energy perspective, the equipment operation of the transformer test station only causes serious economic burden to enterprises and detection centers.

Disclosure of Invention

The utility model provides transformer detection equipment, which aims to solve the problem of how to detect a transformer.

In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a transformer inspection apparatus, the apparatus including: a variable frequency power supply and an integrated measurement and control device; wherein,

the variable frequency power supply is connected with the integrated measurement and control device and is used for providing power for the integrated measurement and control equipment;

the integrated measurement and control device is connected with the transformer to be tested and used for outputting a preset voltage signal to the transformer to be tested and detecting the transformer to be tested according to the operation data of the transformer to be tested;

the variable frequency power supply and the integrated measurement and control device are grounded through a grounding resistor with a preset resistance threshold value.

Preferably, the frequency conversion unit is connected with an input power supply and an output through an air switch, and the frequency conversion power supply comprises a filter circuit, a soft start unit, a rectification filter unit, an IGBT (insulated gate bipolar translator) inverter unit, an isolation voltage transformation filter unit and a main CPU (central processing unit) which are connected in sequence; wherein,

the main CPU is connected with the rectification filter unit through a power module, the main CPU is connected with the IGBT inversion unit through a protection circuit, the protection circuit is connected with the SPWM high-frequency pulse width modulation unit, the SPWM high-frequency pulse width modulation unit is connected with the IGBT inversion unit through a drive output unit, the main CPU is connected with a waveform synthesis unit through a waveform generation unit, and the waveform synthesis unit is connected with the SPWM high-frequency pulse width modulation unit; the IGBT inversion unit is connected with the isolation voltage transformation filtering unit.

Preferably, the variable frequency power supply further comprises: and the keyboard/display module, the communication module, the simulation port control module and the fan control module are all connected with the main CPU.

Preferably, the input power supply comprises three-phase three wires and a ground wire, and the input power supply is 380V +/-10%, 50Hz/60Hz +/-5 Hz.

Preferably, the output of the variable frequency power supply is a phase voltage of 0.1V-462.0V and a line voltage of 0.1V-800.0V, and the frequency of the variable frequency power supply is continuously adjustable between 45Hz and 400 Hz.

Preferably, the partial discharge of the variable frequency power supply is less than or equal to 5 PC.

Preferably, the integrated measurement and control equipment comprises a mutual inductor, a compensation capacitor and a power analyzer box body; wherein,

the transformer is connected with the power analyzer and used for acquiring voltage and current data of the transformer to be detected;

the compensation capacitor is connected with the three-phase line and used for absorbing reactive power in the power system;

the power analyzer is connected with the transformer to be tested and the mutual inductor and used for detecting the transformer to be tested through the phase measuring circuit to obtain power data.

Preferably, the integrated measurement and control device further includes:

a box body;

the output control unit is arranged in the box body and used for outputting the voltage with the preset threshold value to the transformer to be tested;

the industrial vision unit is arranged in the box body and used for shooting a detection image of the transformer to be detected;

the protection unit is arranged in the box body and used for providing overload, overcurrent, overheating and/or short-circuit protection, and the protection unit sends an alarm signal after acting and displays fault information;

the NFC reading unit is arranged in the box body and used for reading the operation data of the transformer to be tested;

and the PLC control unit is connected with the output control unit, the industrial vision unit, the NFC reading unit and the protection unit.

Preferably, the step of the compensation capacitor comprises: 50kVAr, 100 kVAr; the compensation capacitor adopts an electric switching gear shifting mode.

Preferably, the bottom of the box body is installed via channel steel.

The utility model provides a transformer detection device, comprising: the variable frequency power supply is connected with the integrated measurement and control device and is used for providing power for the integrated measurement and control equipment; and the integrated measurement and control device is connected with the transformer to be detected and used for outputting a preset voltage signal to the transformer to be detected and detecting the transformer to be detected according to the operation data of the transformer to be detected. The transformer detection equipment has the test capability of a 10kV-500kV voltage class transformer; the test capability of a 60Hz product can be performed while the test capability of a 50Hz transformer is met; the partial discharge test capability is met, and the partial discharge problem of the IGBT power supply is solved; the set of variable frequency power supply can replace the original voltage regulator, power frequency generator set and intermediate frequency generator set; the highly integrated measurement reduces the error and uncertainty of the measurement loop.

Drawings

A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:

fig. 1 is a schematic structural diagram of a transformer detection apparatus 100 according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a variable frequency power supply according to an embodiment of the utility model.

Detailed Description

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the utility model. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

The following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a transformer detection apparatus 100 according to an embodiment of the present invention. As shown in fig. 1, a transformer detection apparatus 100 according to an embodiment of the present invention includes: variable frequency power supply and integrated measurement and control device.

Preferably, the variable frequency power supply is connected with the integrated measurement and control device and used for providing power for the integrated measurement and control equipment.

Preferably, the integrated measurement and control device is connected with the transformer to be tested and is used for outputting a preset voltage signal to the transformer to be tested and detecting the transformer to be tested according to the operation data of the transformer to be tested.

Preferably, the variable frequency power supply and the integrated measurement and control device are grounded through a grounding resistor with a preset resistance threshold value.

Referring to fig. 1 and 2, in an embodiment of the present invention, a transformer detection apparatus includes: the integrated measurement and control equipment comprises a mutual inductor, a compensating capacitor and a power analyzer, wherein the variable frequency power supply generates a variable frequency power supply with the voltage of 10kV-500kV based on an input power supply, and comprises an IGBT (insulated gate bipolar transistor) inversion unit, an SPWM (sinusoidal pulse width modulation) high-frequency pulse width modulation unit and an isolation variable voltage filtering unit.

Preferably, the input power supply comprises a three-phase three-wire and a ground wire, and the input power supply is 380V +/-10%, 50Hz/60Hz +/-5 Hz. The output of the variable frequency power supply is phase voltage of 0.1V-462.0V and line voltage of 0.1V-800.0V, and the frequency of the variable frequency power supply is continuously adjustable between 45Hz-400 Hz.

As shown in fig. 2, in an embodiment of the present invention, the variable frequency power supply is connected to an input power supply and an output power supply through an air switch, and includes a filter circuit, a soft start unit, a rectification filter unit, an IGBT inverter unit, an isolation transformer filter unit, and a main CPU, which are connected in sequence, the main CPU is connected to the filter circuit through a power module, the main CPU is connected to the IGBT inverter unit through a protection circuit, the protection circuit is connected to the SPWM high frequency pulse width modulation unit, the SPWM high frequency pulse width modulation unit is connected to the IGBT inverter unit through a drive output unit, the main CPU is connected to a waveform synthesis unit through a waveform generation unit, and the waveform synthesis unit is connected to the SPWM high frequency pulse width modulation unit. The variable frequency power supply also comprises a keyboard, a display module, a communication module, an analog port control module and a fan control module which are connected with the main CPU. The partial discharge of the variable frequency power supply is not more than 5 PC.

Preferably, the integrated measurement and control device further includes:

a box body;

Preferably, the bottom of the box body is installed via channel steel.

Preferably, the step of the compensated capacitor comprises: 50kVAr, 100 kVAr.

Preferably, the compensation capacitor is in an electric switching gear shifting mode.

In the embodiment of the utility model, one end of the integrated measurement and control equipment is connected with the variable frequency power supply, the other end of the integrated measurement and control equipment is connected with a transformer to be measured, and the integrated measurement and control equipment comprises a mutual inductor, a compensating capacitor and a power analyzer.

the compensation capacitor is connected with the three-phase line and used for absorbing reactive power in the power system and improving the power factor of the system;

In an embodiment of the present invention, the integrated measurement and control device further includes:

the box body is provided with a plurality of air inlets,

the output control unit is arranged in the box body to output the voltage with the preset parameters to the transformer to be tested;

the industrial vision unit is arranged in the box body and is used for shooting a detection image of the transformer to be detected;

the protection unit is arranged in the box body to provide overload, overcurrent, overheat and short-circuit protection, and the protection device sends out an alarm signal after acting to display fault information;

the NFC reading unit is arranged in the box to read the data of the transformer to be tested;

and the PLC control unit is arranged in the box body, and the PLC control system is connected with the output control unit, the industrial vision system, the NFC reading system and the protection device.

Wherein the bottom of the box body is installed through channel steel. The steps of the compensation capacitor comprise 50kVAr and 100 kVAr. The compensation capacitor adopts an electric switching gear shifting mode.

In one embodiment, the transformer detection device is a variable frequency power supply core device, and is configured with a high-integration measuring system, a control system and a digitizing system.

In one embodiment, the variable frequency power supply body of the transformer detection equipment adopts digital control, and combines SPWM high-frequency pulse width modulation and isolation variable voltage filtering to ensure high power density and extremely high stability of the whole machine. The device has 3 times rated current impact capability and a perfect protection mechanism. The system detects key components such as an IGBT, a transformer, a circuit board and the like and power input and output indexes, and has multiple alarm functions; the method has the characteristics of good dynamic performance, strong load adaptability, high efficiency, simple operation, good partial discharge effect and the like. The modularized design is adopted, so that the maintenance and the function expansion are convenient; the rotating speed of the fan is intelligently controlled by temperature, and the noise is low; and various interfaces such as RS232, RS485, GPIB, analog control and the like can be provided to realize remote control.

In one embodiment, the partial discharge filtering processing equipment for the IGBT variable frequency power supply is specially arranged according to the characteristics of the power supply. The targeted filtering processing system can control the partial discharge of the power output within 5PC, and tests the series resonance equipment, the reactor, the transformer, the power frequency voltage-resistant equipment and the like in the practical application process, wherein the practical partial discharge is only within 3 PC!

Compared with the traditional non-partial discharge variable frequency power supply (triode), the power supply has the following advantages:

the load capacity is strong, and the reactive power and the active power of the full capacity can be output. However, the traditional power supply can not perform reactive output basically, the power factor can only be normally operated when the power factor is more than 0.9, and if a transformer test is performed, particularly an empty load test is performed, the requirement on the accuracy of reactive compensation is very high, and even the theoretical rise cannot be used as a load test power supply.

Stable performance and long service life: at present, the IGBT with large current and high voltage is modularized, and besides the driving circuit of the IGBT is composed of discrete components, an integrated special driving circuit for the IGBT is manufactured.

Maintenance performance: the IGBT module has the characteristics of energy conservation, convenience in installation and maintenance, stable heat dissipation and the like.

In one embodiment, the box body comprises a measurement and control cabinet, and the data measurement, acquisition, output control and power supply capacity compensation are made into an integrated box body. The full-flow control measurement of a no-load test, a load test, an induction withstand voltage test and a temperature rise test can be realized; real-time image acquisition and recording in the test process are realized; reading an NFC anti-counterfeiting chip; test data recording, cloud storage and the like.

In one embodiment, the measurement and control cabinet is configured with: (according to the configuration of the product to be tested; with 10kV2500kVA system configuration for example).

In one embodiment, the transformer detection equipment generates a variable frequency power supply with the voltage of 10kV-500kV based on an input power supply through the variable frequency power supply, one end of the integrated measurement and control equipment is connected with the variable frequency power supply, the other end of the integrated measurement and control equipment is connected with a transformer to be detected, the integrated measurement and control equipment comprises a mutual inductor, a compensating capacitor and a power analyzer, and the variable frequency power supply and the integrated measurement and control equipment are grounded through a grounding resistor smaller than one ohm. The device can realize the full-flow control measurement of a no-load test, a load test, an induction withstand voltage test and a temperature rise test, thereby judging the state of the transformer.

The utility model has been described with reference to a few embodiments. However, other embodiments of the utility model than the one disclosed above are equally possible within the scope of the utility model, as would be apparent to a person skilled in the art from the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.

Claims

1. A transformer testing apparatus, characterized in that the apparatus comprises: a variable frequency power supply and an integrated measurement and control device; wherein,

2. The device according to claim 1, wherein the variable frequency power supply is connected with an input power supply and an output respectively via an air switch, and comprises a filter circuit, a soft start unit, a rectification filter unit, an IGBT inverter unit, an isolation voltage transformation filter unit and a main CPU which are connected in sequence; wherein,

3. The apparatus of claim 2, wherein the variable frequency power supply further comprises: and the keyboard/display module, the communication module, the simulation port control module and the fan control module are all connected with the main CPU.

4. The apparatus of claim 2, wherein the input power source comprises three-phase three-wire and ground, and the input power source is 380V ± 10%, 50Hz/60Hz ± 5 Hz.

5. The apparatus of claim 2, wherein the output of the variable frequency power supply is phase voltage of 0.1-462.0V and line voltage of 0.1-800.0V, and the frequency of the variable frequency power supply is continuously adjustable between 45Hz and 400 Hz.

6. The apparatus of claim 1, wherein the partial discharge of the variable frequency power supply is less than or equal to 5 PC.

7. The device of claim 1, wherein the integrated measurement and control device comprises a transformer, a compensation capacitor and a power analyzer box; wherein,

8. The apparatus of claim 7, wherein the integrated measurement and control apparatus further comprises:

a box body;

9. The apparatus of claim 7, wherein the tap position of the compensation capacitor comprises: 50kVAr, 100 kVAr; the compensation capacitor adopts an electric switching gear shifting mode.

10. The apparatus of claim 7, wherein the bottom of the tank is mounted via a channel.