CN213517518U - Polarity detection equipment of current transformer - Google Patents
Polarity detection equipment of current transformer Download PDFInfo
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- CN213517518U CN213517518U CN202022119218.2U CN202022119218U CN213517518U CN 213517518 U CN213517518 U CN 213517518U CN 202022119218 U CN202022119218 U CN 202022119218U CN 213517518 U CN213517518 U CN 213517518U
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Abstract
The application discloses polarity detection equipment of current transformer, including excitation current output device, first wiring end, second wiring end and current direction detection device. The output end of the excitation current output device is connected with the first wiring end and used for sending an excitation signal; the first wiring end is used for connecting a primary coil of the current transformer to be tested; the second wiring end is used for connecting a secondary coil of the current transformer to be tested; the input end of the current direction detector is connected with the second wiring end and used for receiving an induced current signal generated by the current transformer to be detected and displaying the current direction of the induced current signal. Because the connection mode of the current transformer to be tested and the first wiring end and the second wiring end is known, the polarity of the current transformer to be tested can be determined according to the current direction. And when in measurement, the polarity detection can be realized only by simply connecting the two coils of the current transformer with the equipment without excessive operation, thereby improving the detection efficiency.
Description
Technical Field
The application relates to the technical field of electric equipment, in particular to polarity detection equipment of a current transformer.
Background
The current transformer is an important power element in a power system, and is used for converting a large current on a high-voltage side into a secondary current through an alternating magnetic field so as to be supplied to equipment for protection, wave recording, measurement, metering and the like. Because the relay protection device has different polarity configuration requirements on the polarity of the secondary side of the mutual inductor, if the polarity of the secondary current is reversed, the protection device can be mistakenly operated or refused, the misoperation can seriously threaten the safe operation of a power grid, the refusal operation can cause override trip, and the equipment and personal safety can be further damaged in serious cases.
Therefore, it is an important task to correctly judge the polarity of the current transformer, that is, to determine the same polarity connection between two input terminals and two output terminals, and the polarities of the same polarity connections at the same time are the same. At present, no special equipment is used for detecting the polarity of the current transformer, and the current transformer can only be detected by a multimeter, so that the operation is extremely inconvenient, and the detection efficiency is extremely low.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a polarity detection device for a current transformer, which is used to detect a homopolar terminal between an input terminal and an output terminal of the current transformer to be detected, so as to improve detection efficiency.
In order to achieve the above object, the following solutions are proposed:
a polarity detection apparatus of a current transformer, comprising an excitation current output device, a first terminal, a second terminal, and a current direction detection device, wherein:
the output end of the excitation current output device is connected with the first terminal and used for sending an excitation signal to the first terminal based on the control action of a user;
the first wiring end is used for connecting a primary coil of a current transformer to be tested;
the second wiring end is used for connecting a secondary coil of the current transformer to be tested;
the input end of the current direction detector is connected with the second terminal and is used for receiving an induced current signal generated by the current transformer to be detected under the excitation of the step signal and displaying the current direction of the induced current signal.
Optionally, the excitation current output device is a step signal output device.
Optionally, the step signal output device includes a battery and a detection switch, wherein:
the positive electrode of the battery is connected with one end of the detection switch;
the other end of the detection switch is connected with one wiring terminal of the first wiring terminal;
the negative electrode of the battery is connected to the other terminal of the first terminal.
Optionally, the battery is a rechargeable battery.
Optionally, the system further comprises a charging module, wherein:
the input end of the charging module is used for connecting a mains supply;
the output end of the charging module is connected with the positive electrode and the negative electrode of the rechargeable battery.
Optionally, the system further comprises a charging interface, wherein:
the charging interface is connected with the anode and the cathode of the rechargeable battery and is also used for connecting a charging output interface of external charging equipment.
Optionally, the current direction detection device is an ammeter;
one end of the ammeter is connected with one wiring terminal of the second wiring terminal, and the other end of the ammeter is connected with the other wiring terminal of the second wiring terminal.
Optionally, the ammeter is a pointer ammeter.
Optionally, still include the protective housing, wherein:
the excitation current output device is arranged inside the protective shell;
the first terminal and the second terminal are arranged on the outer wall of the protective shell;
the display panel of the current direction detection device is arranged on the outer wall of the protective shell.
According to the technical scheme, the application discloses polarity detection equipment of a current transformer, which comprises an excitation current output device, a first terminal, a second terminal and a current direction detection device. The output end of the excitation current output device is connected with the first terminal and used for sending an excitation signal to the first terminal based on the control action of a user; the first wiring end is used for connecting a primary coil of the current transformer to be tested; the second wiring end is used for connecting a secondary coil of the current transformer to be tested; the input end of the current direction detector is connected with the second terminal and is used for receiving an induced current signal generated by the current transformer to be detected under the excitation of the step signal and displaying the current direction of the induced current signal. Because the connection mode of the current transformer to be tested and the first wiring end and the second wiring end is known, the polarity of the current transformer to be tested can be determined according to the current direction. And when in measurement, the polarity detection can be realized only by simply connecting the two coils of the current transformer with the equipment without excessive operation, thereby improving the detection efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a polarity detection apparatus of a current transformer according to an embodiment of the present application;
FIG. 2 is a schematic diagram of polarity detection of a current transformer;
fig. 3 is a schematic diagram of a polarity detection apparatus of another current transformer according to an embodiment of the present application;
fig. 4 is a schematic diagram of a polarity detection apparatus of another current transformer according to an embodiment of the present application;
fig. 5 is a schematic diagram of a polarity detection apparatus of another current transformer according to an embodiment of the present application;
fig. 6 is a schematic diagram of a polarity detection apparatus of another current transformer according to an embodiment of the present application;
fig. 7 is a schematic diagram of a polarity detection apparatus of another current transformer according to an embodiment of the present application;
fig. 8 is a schematic diagram of a polarity detection device of another current transformer according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Examples
Fig. 1 is a block diagram of a polarity detection device of a current transformer according to an embodiment of the present application.
As shown in fig. 1, the polarity detection apparatus provided in this embodiment is used to detect the polarity of the current transformer to be tested, that is, detect the homopolar connections of two connections at the input end and two connections at the output end of the current transformer to be tested, or find the homonymous ends of the primary winding W1 and the secondary winding W2 of the current transformer 100 to be tested. The polarity detecting apparatus includes an excitation current output device 10, a first terminal 20, a second terminal 30, and a current direction display device 40.
The polarity detection device of this embodiment detects the current transformer to be tested based on the following principle, as shown in fig. 2, the positive electrode of the battery is connected to the P1 end of the primary coil W1 of the current transformer to be tested through the switch S, and the negative electrode of the battery is connected to the P2 end of the primary coil; the S1 end of a secondary coil W2 of the current transformer to be tested is connected with one end of an ammeter, and the S2 end of the secondary coil is connected with the other end of the ammeter.
The primary coil generates alternating magnetic flux by the manual on-off switch S, and a current is induced in the secondary coil. When the switch S is closed, the current I1 is applied to the primary coil, according to the right-hand screw rule, the magnetic flux shown in fig. 2 is generated in the iron core, and according to the lenz law, the magnetic field of the induced current always hinders the change of the magnetic flux causing the induced current, so according to the right-hand rule, the direction of the induced current I2 of the secondary coil should be as shown in fig. 2; therefore, when the switch S is closed, if the pointer of the ammeter swings in the positive direction, the polarities of the P1 end and the S1 end of the current transformer to be tested are the same; if the swing direction is reversed, the polarity of the end P1 is opposite to that of the end S1.
Based on the above principle, the output terminal of the excitation current output device in the present embodiment is connected to the two connection terminals 21 and 22 of the first terminal.
The two wiring terminals of the first wiring terminal are used for respectively connecting two ends of the primary coil of the current transformer to be tested when the current transformer to be tested is detected, so that when the excitation current output device outputs excitation current, the excitation current can be applied to the primary coil of the current transformer to be tested. The excitation current of the primary coil generates an induced magnetic flux, which generates an induced current signal on the secondary coil.
The two terminals 31 and 32 of the second terminal are each connected to an input of a current direction detection device for indicating the direction of the current between the two terminals of the second terminal, i.e. whether the current direction is from terminal 31 to terminal 32 or from terminal 32 to terminal 31.
The two wiring terminals of the second wiring terminal are respectively used for connecting two ends of a secondary coil of the current transformer to be detected, so that when the secondary coil generates an induced current signal under the excitation of induced magnetic flux, the induced current signal is output to a current direction detection device connected with the second wiring terminal through the second wiring terminal.
The current direction detection device displays the current direction of the second terminal, and the polarity of the output end of the secondary coil of the current transformer to be detected can be known because the connection mode is known; also, since the polarity of the excitation signal output from the excitation current output device through the first terminal is known and the connection manner with the primary coil of the current transformer to be tested is known, the polarities of the primary coil and the secondary coil can be easily determined according to the current direction of the second terminal displayed by the current direction detection device.
It can be seen from the foregoing technical solutions that, this embodiment provides a polarity detection apparatus for a current transformer, which includes an excitation current output device, a first terminal, a second terminal, and a current direction detection device. The output end of the excitation current output device is connected with the first terminal and used for sending an excitation signal to the first terminal based on the control action of a user; the first wiring end is used for connecting a primary coil of the current transformer to be tested; the second wiring end is used for connecting a secondary coil of the current transformer to be tested; the input end of the current direction detector is connected with the second terminal and is used for receiving an induced current signal generated by the current transformer to be detected under the excitation of the step signal and displaying the current direction of the induced current signal. Because the connection mode of the current transformer to be tested and the first wiring end and the second wiring end is known, the polarity of the current transformer to be tested can be determined according to the current direction. And when in measurement, the polarity detection can be realized only by simply connecting the two coils of the current transformer with the equipment without excessive operation, thereby improving the detection efficiency.
In one embodiment of this embodiment, the excitation current output device is a step signal output device, that is, the excitation signal output by the step signal output device is a step signal. The step signal output means includes a battery B and a detection switch S, as shown in fig. 3.
The positive pole of the battery is connected with one end of the detection switch, and the other end of the detection switch is used as one terminal of the output end of the step signal output device and is connected with one wiring terminal 21 of the first wiring terminal; the negative pole of the battery is used as the other terminal of the output of the step signal output means, which is connected to the other connection terminal 22 of the first connection terminal.
The battery may be a lead-acid battery, a lithium battery, or other rechargeable batteries, but the application is not limited to the type of the rechargeable battery.
A lead-acid battery is a storage battery with electrodes mainly made of lead and its oxides and electrolyte solution of sulfuric acid solution. In a discharge state, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in a charged state, the main components of the positive electrode and the negative electrode are lead sulfate. The battery mainly comprises a tubular positive plate, a negative plate, electrolyte, a partition board, a battery jar, a battery cover, a pole, an injection cover and the like. The power device is one of the main power devices in China at present, has wide application in the aspects of transportation, communication facilities, vehicles, ships, army equipment and the like, has better and better performance along with the continuous progress of science and technology, can continuously provide stable voltage through periodic charging, and is very convenient to obtain, low in price and stable in performance. In contrast, dry batteries are inferior, are disposable batteries, cannot be recycled through charging, can damage the environment to a certain extent, and are a waste of resources; in addition, the capacity of the current transformer is limited, and when the polarity of the current transformer with a larger transformation ratio is measured, more batteries are required to be connected in series, so that the operation is inconvenient.
Based on the rechargeable battery, the following two specific embodiments are provided herein for the rechargeable battery in the step signal output device provided in the present application.
The first implementation mode comprises the following steps:
the battery in the step signal output in this application is a rechargeable battery, and in order to conveniently charge the rechargeable battery, the polarity detection apparatus provided in this application further includes a charging module 50, as shown in fig. 4.
The charging module is actually a charging device with voltage transformation function, and its input terminal is connected to the commercial power network through a strong electric terminal, such as a safety socket 60, so as to receive the high-voltage ac power input by the commercial power network and transform the high-voltage ac power into the dc power required for charging the rechargeable battery.
The output end of the charging module is connected with the electrode of the rechargeable battery and used for outputting direct current obtained by conversion of the rechargeable battery.
The second embodiment:
the above embodiment is a solution for the case of no charger in the field, and for the polarity detection device which can be frequently in a chargeable environment, the present embodiment provides another solution, and the solution includes a charging interface 70, as shown in fig. 5. The charging interface is connected with two poles of the battery and is used for connecting an external charger so as to charge the rechargeable battery.
The current direction detecting means in the present embodiment is preferably an ammeter 41, specifically, an analog ammeter which can display the direction of the current applied to its input terminal by the oscillation of its pointer as shown in fig. 6.
Also, in order to facilitate carrying, the polarity detection apparatus provided in this embodiment includes a protection card, and the protection case has a panel on which the first terminal, the second terminal, the charging interface/safety socket, the detection switch, and the display interface of the ammeter are disposed, as shown in fig. 7 and 8.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (9)
1. A polarity detection apparatus of a current transformer, comprising an excitation current output device, a first terminal, a second terminal, and a current direction detection device, wherein:
the output end of the excitation current output device is connected with the first terminal and used for sending an excitation signal to the first terminal based on the control action of a user;
the first wiring end is used for connecting a primary coil of a current transformer to be tested;
the second wiring end is used for connecting a secondary coil of the current transformer to be tested;
the input end of the current direction detector is connected with the second terminal and is used for receiving an induced current signal generated by the current transformer to be detected under the excitation of the step signal and displaying the current direction of the induced current signal.
2. The polarity detection device of claim 1 wherein said excitation current output means is a step signal output means.
3. The polarity detection device of claim 2, wherein the step signal output means comprises a battery and a detection switch, wherein:
the positive electrode of the battery is connected with one end of the detection switch;
the other end of the detection switch is connected with one wiring terminal of the first wiring terminal;
the negative electrode of the battery is connected to the other terminal of the first terminal.
4. The polarity detection device of claim 3 wherein the battery is a rechargeable battery.
5. The polarity detection device of claim 4, further comprising a charging module, wherein:
the input end of the charging module is used for connecting a mains supply;
the output end of the charging module is connected with the positive electrode and the negative electrode of the rechargeable battery.
6. The polarity detection device of claim 4, further comprising a charging interface, wherein:
the charging interface is connected with the positive electrode and the negative electrode of the rechargeable battery and is also used for connecting a charging output interface of external charging equipment.
7. The polarity detecting apparatus according to claim 1, wherein the current direction detecting means is an ammeter;
one end of the ammeter is connected with one wiring terminal of the second wiring terminal, and the other end of the ammeter is connected with the other wiring terminal of the second wiring terminal.
8. The polarity detection device of claim 7, wherein the ammeter is an analog ammeter.
9. The polarity detection device of any one of claims 1 to 8, further comprising a protective case, wherein:
the excitation current output device is arranged inside the protective shell;
the first terminal and the second terminal are arranged on the outer wall of the protective shell;
the display panel of the current direction detection device is arranged on the outer wall of the protective shell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022119218.2U CN213517518U (en) | 2020-09-24 | 2020-09-24 | Polarity detection equipment of current transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022119218.2U CN213517518U (en) | 2020-09-24 | 2020-09-24 | Polarity detection equipment of current transformer |
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| CN213517518U true CN213517518U (en) | 2021-06-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295891A (en) * | 2021-12-24 | 2022-04-08 | 兰州飞行控制有限责任公司 | Differential transformer sensor phase detection system, detection method and detector |
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2020
- 2020-09-24 CN CN202022119218.2U patent/CN213517518U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295891A (en) * | 2021-12-24 | 2022-04-08 | 兰州飞行控制有限责任公司 | Differential transformer sensor phase detection system, detection method and detector |
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