CN108957381B - Polarity tester for current transformer - Google Patents
Polarity tester for current transformer Download PDFInfo
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- CN108957381B CN108957381B CN201810987923.9A CN201810987923A CN108957381B CN 108957381 B CN108957381 B CN 108957381B CN 201810987923 A CN201810987923 A CN 201810987923A CN 108957381 B CN108957381 B CN 108957381B
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- controller
- magnetic field
- current transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides a polarity tester for a current transformer, and relates to the field of current transformers. The device comprises a controller, a magnetic field part and a testing part, wherein the controller is respectively electrically connected with the magnetic field part and the testing part, two poles of the testing part are respectively electrically connected with two ends of a secondary side coil, and the controller is used for controlling the magnetic field part to execute preset actions so as to enable the secondary side coil to generate current; the testing part is used for testing the direction of the current in the secondary side coil and sending the direction of the current in the secondary side coil to the controller; the controller is also used for obtaining the polarity of the current transformer according to the preset action executed by the magnetic field part and the direction of the current in the secondary side coil. The controller, the magnetic field part and the testing part can conveniently and quickly judge the polarity of the current transformer through the principle, so that the labor cost is reduced, and the operation is simple.
Description
Technical Field
The invention relates to the field of current transformers, in particular to a polarity tester of a current transformer.
Background
In order to ensure safe and economical operation of the power system, the operating conditions of the power equipment must be monitored and measured. However, the general measuring and protecting device cannot be directly connected to the primary high-voltage equipment, and the large current of the primary system needs to be converted into the small current in proportion to be supplied to the measuring instrument and the protecting device, so that the current transformer is used.
The polarity of the current transformer means that the polarity of the primary side is the same as the polarity of one end of the secondary side at a certain moment, namely, the polarities are positive or negative at the same time, and the polarity is called as a homopolar end or a homonymous end. In the practical operation and maintenance of the power system, it is necessary to determine the polarity of the current transformer.
In the prior art, when a current transformer is subjected to a whole set of tests (namely, wiring is carried out from a primary side of a switch position current transformer to a secondary side of a protection device position current transformer), at least two persons are required to complete the tests, wherein at least one person utilizes an interphone to convey the test switch state of the primary side, including opening and closing, at least one person observes the change condition of a milliammeter at the secondary side, then the polarity of the current transformer is judged, the operation is complex, and the labor cost is high.
Disclosure of Invention
The present invention aims to provide a polarity tester for a current transformer, which aims to improve the existing problems.
The invention provides a current transformer polarity tester, which comprises a secondary side coil, and comprises a magnetic field part, a testing part and a controller, wherein the controller is respectively electrically connected with the magnetic field part and the testing part; the testing part is used for testing the direction of the current in the secondary side coil and sending the direction of the current in the secondary side coil to the controller; the controller is further configured to obtain a polarity of the current transformer according to a preset action performed by the magnetic field portion and a direction of current in the secondary side coil.
Further, the magnetic field portion includes a first battery, a cable, and a switch, the first battery and the switch are connected in series through the cable to form a loop, the switch is electrically connected to the controller, and the controller is configured to control the switch to open or close.
Further, the magnetic field part also comprises a resistor and a first indicator light, and the first storage battery, the resistor, the first indicator light and the switch are connected in series through the cable to form a loop.
Further, the switch adopts the relay switch, the relay switch includes relay coil and normally open contact, the controller with the relay coil electricity is connected, first battery, resistance, first pilot lamp and normally open contact pass through the cable is established ties into the return circuit.
Further, the magnetic field portion further comprises a first moving device, the first moving device is electrically connected with the controller, and the controller controls the first moving device to drive the cable to move according to a first preset track.
Further, the magnetic field part comprises a magnet and a second moving device, the magnet is connected with the second moving device, the second moving device is electrically connected with the controller, and the controller controls the second moving device to drive the magnet to move according to a second preset track.
Furthermore, the testing part adopts a digital ammeter
Furthermore, the test part adopts a double-bias ammeter.
Further, the polarity tester of the current transformer further comprises a display device, the display device is electrically connected with the controller, and the display device is used for displaying the polarity information of the current transformer transmitted by the controller.
Further, the display device adopts a second indicator light or a display screen.
The polarity tester of the current transformer provided by the invention has the beneficial effects that: the controller is respectively electrically connected with the magnetic field part and the testing part, two poles of the testing part are respectively electrically connected with two ends of the secondary side coil, and the controller is used for controlling the magnetic field part to execute preset actions so as to enable the secondary side coil to generate current; the testing part is used for testing the direction of the current in the secondary side coil and sending the direction of the current in the secondary side coil to the controller; the controller is also used for obtaining the polarity of the current transformer according to the preset action executed by the magnetic field part and the direction of the current in the secondary side coil. The controller, the magnetic field part and the testing part can conveniently and quickly judge the polarity of the current transformer through the principle, so that the labor cost is reduced, and the operation is simple.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a circuit connection block diagram of a current transformer polarity tester provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a magnetic field portion of a current transformer polarity tester according to an embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of a switch and a first mobile device of a polarity tester of a current transformer according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a relationship between a magnetic field portion and a secondary side coil of the polarity tester for a current transformer according to the embodiment of the present invention;
fig. 5 is a circuit diagram of a secondary side coil and a testing portion of the polarity tester for a current transformer according to the embodiment of the present invention.
Icon: 10-a controller; 20-a magnetic field portion; 30-a test section; 40-a second power supply; 50-secondary side coil; 60-a display device; 201-a first power supply; 202-a cable; 203-a switch; 2031-relay coil; 2032-normally open contact; 204-resistance; 205-a first indicator light; 206-a first mobile device; 207-a second mobile device; 208-magnet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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 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", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention conventionally put into use, or the orientations or positional relationships that the persons skilled in the art conventionally understand, are only used for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1, the present embodiment provides a current transformer polarity tester, which is used for detecting and determining the polarity of a current transformer. The current transformer includes a primary side coil and a secondary side coil 50. The current transformer polarity tester includes a controller 10, a magnetic field part 20, a test part 30, a second power source 40, and a display device 60. The controller 10 is electrically connected to the magnetic field unit 20, the test unit 30, the second power supply 40, and the display device 60, respectively. The test section 30 and the secondary side coil 50 are connected in series to form a circuit.
There are various options for the controller 10, for example: a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), a single chip, and the like. In this embodiment, a DSP is used.
The controller 10 is configured to control the magnetic field portion 20 to perform a predetermined action so as to generate a current in the secondary coil 50.
As shown in fig. 2, the magnetic field portion 20 includes a first power supply 201, a cable 202, a switch 203, a resistor 204, and a first indicator light 205. The first power supply 201, the switch 203, the resistor 204 and the first indicator light 205 are connected in series to form a loop through the cable 202.
The switch 203 is a relay switch, and the switch 203 includes a relay coil 2031 and a normally open contact 2032.
The first power supply 201, the normally open contact 2032, the resistor 204, and the first indicator light 205 are connected in series in a loop via a cable 202. Resistor 204 is used to limit the current magnitude. The first indicator light 205 is lightened when the circuit is conducted, so that an operator can find out circuit faults and timely overhaul.
The controller 10 is electrically connected to the relay coil 2031. The controller 10 is configured to send a trigger signal to the relay coil 2031, that is, apply a voltage across the relay coil 2031, and generate a magnetic field when a current passes through the relay coil 2031, so as to control the normally open contact 2032 to open or close, so as to control the first power source 201, the normally open contact 2032, the resistor 204, and the first indicator light 205 to open or close a loop formed by serially connecting the cable 202.
The cable 202 may be threaded through the secondary side coil 50 or disposed adjacent to the secondary side coil 50. When there is a current in the cable 202, the cable 202 generates a magnetic field due to electromagnetic induction, and the magnetic field covers the secondary side coil 50. When the normally open contact 2032 is opened to closed, the current in the cable 202 changes from zero to present, that is, the magnetic field in the secondary coil 50 changes from zero to present, and the induced electromotive force corresponding to the change of the magnetic field is generated in the secondary coil 50, so that the current flows in the secondary coil 50.
When the normally open contact 2032 is opened from the closed state, the current flows through the cable 202 from the presence to the absence thereof, that is, the presence or the absence of the magnetic field in the secondary coil 50, and an induced electromotive force corresponding to the presence or the absence of the magnetic field is also generated in the secondary coil 50, so that the current flows through the secondary coil 50.
The controller 10 is used for controlling the magnetic field portion 20 to perform a preset action, and here, it can be understood that the controller 10 controls the switch 203 to perform an opening or closing action.
The magnetic field portion 20 further comprises a first moving means 206. As shown in fig. 3, the first mobile device 206 is electrically connected to the controller 10. The first power source 201, the cable 202, the switch 203, the resistor 204 and the first indicator light 205 may be fixed to the first mobile device 206 by means of bonding or clipping, which is not limited herein. The controller 10 is further configured to control the first moving device 206 to move the cable 202 according to a first preset trajectory.
When the switch 203 is closed, a magnetic field is generated around the cable 202, and when the cable 202 moves in a direction away from the secondary coil 50, the magnetic field strength in the secondary coil 50 gradually weakens, and the secondary coil 50 generates an induced electromotive force corresponding to the gradual weakening of the magnetic field strength, so that a current flows in the secondary coil 50.
When the cable 202 moves in a direction approaching the secondary coil 50, the magnetic field strength in the secondary coil 50 gradually increases, and the secondary coil 50 generates an induced electromotive force corresponding to the gradually increasing magnetic field strength, so that a current flows through the secondary coil 50.
The first predetermined trajectory may be a movement toward the secondary side coil 50 or a movement away from the secondary side coil 50.
Of course, the magnetic field portion 20 may also include a magnet 208 and a second moving device 207. The second moving device 207 is electrically connected to the controller 10. The magnet 208 may be fixed to the second moving device 207 by means of bonding or fastening, which is not limited herein. The controller 10 is further configured to control the second moving device 207 to move the magnet 208 according to a second predetermined trajectory. The positional relationship between the magnetic field section 20 and the secondary side coil 50 can be as shown in fig. 4.
When a magnetic field is generated around the magnet 208 and the magnet 208 moves in a direction away from the secondary coil 50, the magnetic field strength in the secondary coil 50 gradually weakens, and the secondary coil 50 generates an induced electromotive force corresponding to the gradually weakened magnetic field strength, so that a current flows in the secondary coil 50.
When the magnet 208 moves in a direction approaching the secondary coil 50, the magnetic field strength in the secondary coil 50 gradually increases, and the secondary coil 50 generates an induced electromotive force corresponding to the gradually increasing magnetic field strength, so that a current flows through the secondary coil 50.
The second predetermined trajectory movement may be a movement toward the secondary side coil 50 or a movement away from the secondary side coil 50.
The first moving device 206 and the second moving device 207 may be slidable plates, swingable plates, or drive tracks, and are not limited thereto.
As shown in fig. 5, two poles of the test section 30 are electrically connected to two ends of the secondary side coil 50, respectively, and the test section 30 is configured to test a direction of a current in the secondary side coil 50 and transmit the detected direction of the current in the secondary side coil 50 to the controller 10. The controller 10 is further configured to obtain the polarity of the current transformer according to the preset action performed by the magnetic field portion 20, the first preset trajectory, the second preset trajectory, and the direction of the current in the secondary-side coil 50.
The test section 30 may employ a digital ammeter or a double bias ammeter. In this embodiment, a double-bias ammeter is preferable because it is convenient to connect and direct to observe.
The first power source 201 and the second power source 40 may employ a battery.
The display device 60 may adopt a second indicator light or a display screen for displaying the information of the polarity test of the current transformer transmitted by the controller 10, so that the information is convenient for the operator to observe, and the operator does not need to calculate separately, thereby saving time.
To sum up, in the current transformer polarity tester that this embodiment provided: firstly, the polarity of the current transformer can be conveniently and quickly judged through the controller, the magnetic field part and the testing part, so that the labor cost is reduced, and the operation is simple; secondly, first power, switch, resistance and first pilot lamp pass through the cable electricity and connect, have reduced circuit fault probability, also more make things convenient for operating personnel in time to discover circuit fault, avoid the maloperation to raise the efficiency, at last, be equipped with display device, the operating personnel direct observation current transformer's of being convenient for polarity test result reduces operating personnel's judgement time, thereby practices thrift manpower and time.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A polarity tester of a current transformer comprises a secondary side coil, and is characterized by comprising a magnetic field part, a testing part and a controller, wherein the controller is respectively and electrically connected with the magnetic field part and the testing part; the testing part is used for testing the direction of the current in the secondary side coil and sending the direction of the current in the secondary side coil to the controller; the controller is further used for obtaining the polarity of the current transformer according to a preset action executed by the magnetic field part and the direction of the current in the secondary side coil;
the magnetic field part comprises a first storage battery, a cable and a switch, the first storage battery and the switch are connected in series through the cable to form a loop, the switch is electrically connected with the controller, and the controller is used for controlling the switch to be opened or closed;
the magnetic field part further comprises a first moving device, the first moving device is electrically connected with the controller, and the controller controls the first moving device to drive the cable to move according to a first preset track;
the first moving device adopts a slidable plate body, a swingable plate body or a transmission track.
2. The polarity tester of claim 1, wherein said magnetic field portion further comprises a resistor and a first indicator light, and said first battery, said resistor, said first indicator light and said switch are connected in series via said cable to form a loop.
3. The polarity tester of the current transformer according to claim 2, wherein the switch is a relay switch, the relay switch comprises a relay coil and a normally open contact, the controller is electrically connected with the relay coil, and the first battery, the resistor, the first indicator light and the normally open contact are connected in series through the cable to form a loop.
4. The polarity tester of the current transformer according to claim 1, wherein the testing part employs a digital ammeter.
5. The polarity tester of the current transformer according to claim 1, wherein the testing part adopts a double-bias ammeter.
6. The polarity tester of claim 1, further comprising a display device electrically connected to the controller, the display device being configured to display the polarity information of the current transformer transmitted by the controller.
7. The polarity tester of the current transformer according to claim 6, wherein the display device is a second indicator light or a display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810987923.9A CN108957381B (en) | 2018-08-28 | 2018-08-28 | Polarity tester for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810987923.9A CN108957381B (en) | 2018-08-28 | 2018-08-28 | Polarity tester for current transformer |
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| Publication Number | Publication Date |
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| CN108957381A CN108957381A (en) | 2018-12-07 |
| CN108957381B true CN108957381B (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810987923.9A Active CN108957381B (en) | 2018-08-28 | 2018-08-28 | Polarity tester for current transformer |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111147334B (en) * | 2019-12-31 | 2022-04-26 | 北京信而泰科技股份有限公司 | Network tester |
| CN113325340B (en) * | 2021-04-23 | 2022-08-12 | 上海卫星工程研究所 | Polarity testing method, system and device for double-supersatellite magnetic suspension actuator |
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| GB2259780A (en) * | 1991-09-20 | 1993-03-24 | Michael Barry Watson | Sensing electric currents |
| CN101957420A (en) * | 2010-09-19 | 2011-01-26 | 江苏省电力公司仪征市供电公司 | Device for testing polarities of mutual inductor of switchgear |
| CN202916381U (en) * | 2012-09-26 | 2013-05-01 | 秦皇岛开发区海纳电测仪器有限责任公司 | Polarity testing device of transformer |
| CN203910123U (en) * | 2014-06-18 | 2014-10-29 | 温州海诚实验室设备有限公司 | Electromagnetic induction teaching equipment |
| CN104849611A (en) * | 2015-04-24 | 2015-08-19 | 国家电网公司 | Polarity test system of current transformer |
| CN206209042U (en) * | 2016-10-08 | 2017-05-31 | 广东电网有限责任公司惠州供电局 | Instrument for testing polarity of current transformer |
| CN207396707U (en) * | 2017-10-11 | 2018-05-22 | 国网宁夏电力公司吴忠供电公司 | 110kV current transformer integrated form polarity test devices |
| CN208921848U (en) * | 2018-08-28 | 2019-05-31 | 广东电网有限责任公司 | A kind of instrument for testing polarity of current transformer |
-
2018
- 2018-08-28 CN CN201810987923.9A patent/CN108957381B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2259780A (en) * | 1991-09-20 | 1993-03-24 | Michael Barry Watson | Sensing electric currents |
| CN101957420A (en) * | 2010-09-19 | 2011-01-26 | 江苏省电力公司仪征市供电公司 | Device for testing polarities of mutual inductor of switchgear |
| CN202916381U (en) * | 2012-09-26 | 2013-05-01 | 秦皇岛开发区海纳电测仪器有限责任公司 | Polarity testing device of transformer |
| CN203910123U (en) * | 2014-06-18 | 2014-10-29 | 温州海诚实验室设备有限公司 | Electromagnetic induction teaching equipment |
| CN104849611A (en) * | 2015-04-24 | 2015-08-19 | 国家电网公司 | Polarity test system of current transformer |
| CN206209042U (en) * | 2016-10-08 | 2017-05-31 | 广东电网有限责任公司惠州供电局 | Instrument for testing polarity of current transformer |
| CN207396707U (en) * | 2017-10-11 | 2018-05-22 | 国网宁夏电力公司吴忠供电公司 | 110kV current transformer integrated form polarity test devices |
| CN208921848U (en) * | 2018-08-28 | 2019-05-31 | 广东电网有限责任公司 | A kind of instrument for testing polarity of current transformer |
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