CN107589331B - Relay protection testing device - Google Patents
Relay protection testing device Download PDFInfo
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- CN107589331B CN107589331B CN201710959550.XA CN201710959550A CN107589331B CN 107589331 B CN107589331 B CN 107589331B CN 201710959550 A CN201710959550 A CN 201710959550A CN 107589331 B CN107589331 B CN 107589331B
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- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 238000012795 verification Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The invention discloses a relay protection testing device, which is applied to an electronic current transformer and a protection device thereof, and comprises the following components: the device comprises a frequency converter, a small signal generator, a signal monitor, a change-over switch and an aviation plug; the input end of the frequency converter is connected with an alternating current power supply, the output end of the frequency converter is connected with the input end of the small signal generator, the output end of the small signal generator is connected with the input end of the signal monitor, the output end of the signal monitor is connected with the input end of the change-over switch, and the output end of the change-over switch outputs a small analog signal to the electronic current transformer or the protection device of the electronic current transformer through aviation; the invention can directly generate high-precision small analog signals by utilizing the small signal generator, can randomly adjust the magnitude of small analog signal values according to the needs, and realizes the convenient verification of the electronic CT and the protection device thereof by using the transmission and the detection of the aviation-inserted small analog signals corresponding to the electronic CT and the protection device thereof.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a relay protection testing device.
Background
In the prior art, an electronic Current Transformer (CT) is generally applied to an early digital transformer substation, and a small analog signal is transmitted between the electronic CT and a protection device, which is different from an analog signal of a traditional CT and a light signal of a photoelectric CT, and a device capable of outputting the small analog signal in the market cannot be directly used due to the non-versatility of a device interface, so that a field worker lacks a suitable verification device for verification of a checksum corresponding to the protection device of the electronic CT, which is not beneficial to maintenance work and causes a great potential safety hazard for normal operation of a power grid.
Therefore, how to provide a relay protection testing device capable of conveniently checking an electronic CT and a protection device thereof, and reducing the workload of field staff is a problem which needs to be solved in the present day.
Disclosure of Invention
The invention aims to provide a relay protection testing device, which solves the problems of generation and output of small analog signals, simplifies field operation steps and realizes convenient verification of an electronic CT and a protection device thereof.
In order to solve the technical problems, the invention provides a relay protection testing device applied to an electronic current transformer and a protection device thereof, comprising: the device comprises a frequency converter, a small signal generator, a signal monitor, a change-over switch and an aviation plug;
the input end of the frequency converter is connected with an alternating current power supply, the output end of the frequency converter is connected with the input end of the small signal generator, the output end of the small signal generator is connected with the input end of the signal monitor, the output end of the signal monitor is connected with the input end of the change-over switch, and the output end of the change-over switch outputs small analog signals to the electronic current transformer or the protection device of the electronic current transformer through the aviation plug.
Optionally, the apparatus further comprises: a first circuit breaker;
the input end of the frequency converter is connected with the alternating current power supply through the first circuit breaker.
Optionally, the first circuit breaker is specifically a first air switch.
Optionally, the apparatus further comprises: a power indicator lamp for prompting the state of the alternating current power supply;
the power indicator lamp is connected with the accessed alternating current power supply in parallel.
Optionally, the apparatus further comprises: a second circuit breaker;
the output end of the small signal generator is connected with the input end of the signal monitor through the second circuit breaker.
Optionally, the second circuit breaker is specifically a second air switch.
Optionally, the ac power supply is specifically a 220V ac power supply.
The invention provides a relay protection testing device, which is applied to an electronic current transformer and a protection device thereof, and comprises the following components: the device comprises a frequency converter, a small signal generator, a signal monitor, a change-over switch and an aviation plug; the input end of the frequency converter is connected with an alternating current power supply, the output end of the frequency converter is connected with the input end of the small signal generator, the output end of the small signal generator is connected with the input end of the signal monitor, the output end of the signal monitor is connected with the input end of the change-over switch, and the output end of the change-over switch outputs a small analog signal to the electronic current transformer or the protection device of the electronic current transformer through aviation;
therefore, the invention can directly generate a high-precision small analog signal by utilizing the small signal generator, can randomly adjust the value of the small analog signal according to the requirement, and ensures plug-and-play by using the transmission and detection of the aviation plug-in small analog signal corresponding to the electronic CT and the protection device thereof, thereby not only solving the problems of generating and outputting the small analog signal, but also simplifying the field operation steps and realizing the convenient verification of the electronic CT and the protection device thereof.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a relay protection testing device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another relay protection testing device according to an embodiment of the present invention;
FIG. 3 is a front layout diagram of another relay protection testing device according to an embodiment of the present invention;
fig. 4 is a front view of another relay protection testing apparatus according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a block diagram of a relay protection testing device according to an embodiment of the present invention. The device is applied to an electronic current transformer and a protection device thereof, and can comprise: frequency converter 100, small signal generator 200, signal monitor 300, change-over switch 400, and aviation plug 500;
the input end of the frequency converter 100 is connected with an ac power supply, the output end of the frequency converter 100 is connected with the input end of the small signal generator 200, the output end of the small signal generator 200 is connected with the input end of the signal monitor 300, the output end of the signal monitor 300 is connected with the input end of the change-over switch 400, and the output end of the change-over switch 400 outputs a small analog signal to the electronic current transformer or the protection device of the electronic current transformer through the aviation plug 500.
It can be appreciated that the ac power source connected to the input end of the frequency converter 100 may be an ac 220V power source, which is convenient for a worker to find on a job site and has no intersection with the dc power source in the transformer substation, thereby avoiding the risk of affecting the dc system.
Specifically, the purpose of the present embodiment is to output a high-precision small analog signal (analog small signal) directly used by the electronic CT or the electronic CT protection device according to the requirement by using the small signal generator 200, and the specific model of the small signal generator 200 can be selected by the designer, so that the present embodiment does not limit the specific model. Correspondingly, the relay protection testing device provided in this embodiment may further check the signal conditioning device between the electronic CT and the corresponding protection device, which is also not limited in this embodiment.
It should be noted that, the signal monitor 300 in this embodiment may be a device for monitoring and displaying the small analog signal output by the small signal generator 200 in real time. For the specific structure of the signal monitor 300, that is, the specific manner of detecting and displaying the small analog signal output by the small signal generator 200, the designer may set the specific structure according to the practical situation and the user requirement, for example, the small analog signal of a phase, the small analog signal of B phase and the small analog signal of C phase, which are output by the small signal generator 200, may be monitored and displayed respectively, such as the small signal detector of a phase, the small signal detector of B phase and the small signal detector of C phase, which are set in fig. 3. The present embodiment does not impose any limitation on this.
The change-over switch 400 in this embodiment may be a switch for converting voltage or current that outputs a small analog signal to the electronic CT or the electronic CT protection device through the aviation plug 500, for example, the change-over switch 400 may control to output a small analog voltage signal of a phase, B phase and C phase, or output a small analog current signal of a phase, B phase and C phase, and a small analog voltage and current signal of a phase, B phase and C phase to the electronic CT or the electronic CT protection device through the aviation plug 500. The specific configuration of the change-over switch 400 may be set by the designer, so long as the desired small analog signal can be output to the electronic CT or the protection device of the electronic CT through the aviation plug 500, which is not limited in this embodiment.
Specifically, the aviation plug 500 may be a device for connecting with an electronic CT or a protection device of the electronic CT, and outputting a small analog signal to the electronic CT or the protection device of the electronic CT, and for a specific setting mode of the aviation plug 500, may be three aviation plugs for outputting an a-phase small analog signal, a B-phase small analog signal, and a C-phase small analog signal, respectively, such as an a-aviation plug for outputting an a-phase small analog signal, a B-aviation plug for outputting a B-phase small analog signal, and a C-aviation plug for outputting a C-phase small analog signal in fig. 3.
Optionally, in order to improve the safety of the relay protection testing device provided by this embodiment, the device may further include: a first circuit breaker connected to the input of the frequency converter 100 for connection to an ac power source.
Optionally, in order to improve the service life of the components in the relay protection testing device provided by the embodiment, the device may further include: and a second circuit breaker connected to the output of the small signal generator 200 and the input of the signal monitor 300, respectively. Wherein, the second circuit breaker may be disposed between the small signal generator 200 and the signal monitor 300, that is, the output end of the small signal generator 200 is connected with the input end of the signal monitor 300 through the second circuit breaker; may also be provided between the signal monitor 300 and the change-over switch 400; but may also be disposed between the transfer switch 400 and the aviation plug 500, which is not limited in any way by the present embodiment.
It will be appreciated that the selection of specific components of the first circuit breaker and the second circuit breaker may be set by the designer, and may be specifically set as different air switches (the first air switch and the second air switch) as shown in fig. 2, so long as the purposes of protecting the circuit safety and improving the service life of the components in the device can be achieved, which is not limited in this embodiment.
Optionally, in order to facilitate use of a worker, the relay protection testing device provided by this embodiment may further include: a power indicator lamp for prompting the state of the alternating current power supply; the power indicator lamp is connected with the connected alternating current power supply in parallel.
It should be noted that, the specific setting of the power indicator lamp may be as shown in fig. 3, and the normal and abnormal states of the connected ac power source are respectively displayed by the two indicator lamps, which is further convenient for the use of the staff, and the implementation does not limit the situation.
Specifically, each component in the relay protection testing device provided by the embodiment can be fixed in the box body, so that the relay protection testing device is convenient for workers to carry and use.
In the embodiment of the invention, the small signal generator is utilized to directly generate the high-precision small analog signal, the magnitude of the small analog signal value can be adjusted arbitrarily according to the requirement, and the transmission and detection of the aviation plug-in small analog signal corresponding to the electronic CT and the protection device thereof are used to ensure plug-and-play, so that the problems of generating and outputting the small analog signal are solved, the field operation steps are simplified, and the convenient verification of the electronic CT and the protection device thereof is realized.
The relay protection testing device provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. The utility model provides a relay protection testing arrangement which characterized in that is applied to electronic type current transformer and protection device thereof, includes: the device comprises a frequency converter, a small signal generator, a signal monitor, a change-over switch and an aviation plug;
the input end of the frequency converter is connected with an alternating current power supply, the output end of the frequency converter is connected with the input end of the small signal generator, the output end of the small signal generator is connected with the input end of the signal monitor, the output end of the signal monitor is connected with the input end of the change-over switch, and the output end of the change-over switch outputs a small analog signal to the electronic current transformer or the protection device of the electronic current transformer through the aviation plug; the alternating current power supply is specifically a 220V alternating current power supply; the change-over switch is a switch for converting voltage or current which outputs a small analog signal to the electronic current transformer or the protection device of the electronic current transformer through the aviation plug.
2. The relay protection testing device of claim 1, further comprising: a first circuit breaker;
the input end of the frequency converter is connected with the alternating current power supply through the first circuit breaker.
3. The relay protection testing device of claim 2, wherein the first circuit breaker is embodied as a first air switch.
4. The relay protection testing device of claim 3, further comprising: a power indicator lamp for prompting the state of the alternating current power supply;
the power indicator lamp is connected with the accessed alternating current power supply in parallel.
5. The relay protection testing device of any one of claims 1 to 4, further comprising: a second circuit breaker;
the output end of the small signal generator is connected with the input end of the signal monitor through the second circuit breaker.
6. The relay protection testing device of claim 5, wherein the second circuit breaker is embodied as a second air switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710959550.XA CN107589331B (en) | 2017-10-16 | 2017-10-16 | Relay protection testing device |
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| CN201710959550.XA CN107589331B (en) | 2017-10-16 | 2017-10-16 | Relay protection testing device |
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| CN107589331A CN107589331A (en) | 2018-01-16 |
| CN107589331B true CN107589331B (en) | 2024-04-05 |
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| CN110554221A (en) * | 2019-09-16 | 2019-12-10 | 广东电网有限责任公司 | Relay protection test wire |
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