CN210155229U - Resistive current tester for lightning arrester - Google Patents
Resistive current tester for lightning arrester Download PDFInfo
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- CN210155229U CN210155229U CN201920659326.3U CN201920659326U CN210155229U CN 210155229 U CN210155229 U CN 210155229U CN 201920659326 U CN201920659326 U CN 201920659326U CN 210155229 U CN210155229 U CN 210155229U
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- voltage
- resistive current
- lightning arrester
- signal
- current tester
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Abstract
The utility model relates to a hindering nature current tester for arrester, include: the coupling magnetic bar mechanism is used for collecting magnetic field signals leaked by the transformer core inside the PT; the voltage acquisition module is electrically connected with the coupling magnetic bar mechanism and used for converting the magnetic field signal into a voltage signal; and the main control module is used for receiving the voltage signal and using the voltage signal as a reference voltage for the resistive current test. In the embodiment, a special high-sensitivity coupling magnetic rod is adopted to collect a leakage magnetic field of the voltage transformer near a base of the voltage transformer as a resistive current test method of a reference voltage signal. The design key lies in that a leakage magnetic field of the voltage transformer is intercepted through the coupling magnetic rod to be amplified and restored to obtain a voltage signal. The accuracy of taking voltage signals from the PT side in the traditional test method is maintained, and various inconveniences of taking the voltage signals on site are fundamentally solved.
Description
Technical Field
The utility model relates to an electricity field especially relates to a resistive current tester for arrester.
Background
The resistive current tester is widely applied to a power system at present, is used as important detection equipment for detecting whether the lightning arrester normally operates, and has important significance for the safe operation of the power system. However, in the existing resistive current test method, each test must collect the secondary voltage signal of the voltage transformer (PT for short) on site. Because of the voltage test line need insert PT secondary terminal for test process operation steps are loaded down with trivial details, simultaneously still greatly increased the security threat to other equipment in the PT cabinet.
At present, the mainstream resistive current test methods mainly comprise the following methods:
as shown in fig. 1, the first method: the voltage signal is collected from a PT cabinet near the lightning arrester to be tested, and then the voltage collection module and the current test host machine are synchronously measured in a wired connection mode.
The disadvantages of this method are:
1. the voltage acquisition module is connected with the host computer in a wired mode, and for a relatively large substation, the distance between the PT cabinet and the lightning arrester is long, so that the communication cable is too long, and the test time and the working difficulty are increased;
2. because the communication cable cannot be infinitely long, even when a resistive current test is carried out on the same transformer substation, different places have to be replaced to acquire secondary voltages of a plurality of PT cabinets, so that potential safety hazards formed by the operation safety of other equipment in the wiring process are greatly increased;
as shown in fig. 2, method two: and collecting the voltage signals in a PT cabinet, and then communicating and synchronously measuring the voltage collecting module and the current testing host machine in a wireless mode. The method is an upgrade of the first method, and solves the problem that the communication line and the same power station obtain PT voltage for multiple times.
The disadvantages of this method are: during the test, the voltage acquisition of the PT cabinet is still needed;
SUMMERY OF THE UTILITY MODEL
On this basis, it is necessary to provide a resistive current tester for an arrester aiming at the problem acquisition problem that the operation is inconvenient because the voltage needs to be directly applied to the PT cabinet.
A resistive current tester for a lightning arrester, comprising:
the coupling magnetic bar mechanism is used for collecting magnetic field signals leaked by the transformer core inside the PT;
the voltage acquisition module is electrically connected with the coupling magnetic bar mechanism and used for converting the magnetic field signal into a voltage signal;
and the main control module is used for receiving the voltage signal and using the voltage signal as a reference voltage for the resistive current test.
In one preferred embodiment, the voltage acquisition module transmits the voltage signal to the main control module in a wireless transmission manner.
In one preferred embodiment, the wireless transmission mode is a LoRa transmission mode.
In one preferred embodiment, the coupled magnetic bar mechanism comprises:
a central magnetic rod;
a coil surrounding the periphery of the central magnetic rod;
an outer shield layer disposed around the coil;
and the handle is arranged at one end of the central magnetic rod.
In one preferred embodiment, the number of turns of the coil is 2000 turns.
In one preferred embodiment, the voltage acquisition module is electrically connected with the coupling magnetic rod mechanism through a signal wire.
In one preferred embodiment, the voltage acquisition module comprises a signal amplification unit for performing signal amplification on the magnetic field signal.
In one preferred embodiment, the coupling bar magnet mechanism is configured to be placed outside the PT bottom enclosure.
In one preferred embodiment, the main control module is electrically connected with the lightning arrester.
In the embodiment, a special high-sensitivity coupling magnetic rod is adopted to collect a leakage magnetic field of the voltage transformer near a base of the voltage transformer as a resistive current test method of a reference voltage signal. The design key lies in that a leakage magnetic field of the voltage transformer is intercepted through the coupling magnetic rod to be amplified and restored to obtain a voltage signal. The accuracy of taking voltage signals from the PT side in the traditional test method is maintained, and various inconveniences of taking the voltage signals on site are fundamentally solved.
Drawings
FIG. 1 is a schematic structural diagram of a structure corresponding to a resistive current testing method in the background art;
FIG. 2 is a schematic structural diagram of a structure corresponding to a second resistive current testing method in the background art;
fig. 3 is a schematic structural view of a resistive current tester for an arrester according to a preferred embodiment of the present invention;
fig. 4 is a schematic structural diagram of a coupling magnetic rod structure of a resistive current tester for an arrester according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all 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. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 3 and 4, a preferred embodiment of the present invention discloses a resistive current tester 100 for an arrester, where the resistive current tester 100 includes a coupling bar magnet mechanism 110, a voltage acquisition module 120, and a main control module 130.
The coupled magnetic bar mechanism 110 is used for collecting magnetic field signals leaked out of the transformer core inside the PT. The voltage acquisition module 120 is electrically connected to the coupling bar magnet mechanism, and is configured to convert the magnetic field signal into a voltage signal. The main control module 130 is configured to receive the voltage signal, and use the voltage signal as a reference voltage for the resistive current test.
In this embodiment, the main control module is electrically connected to the lightning arrester.
The voltage acquisition module 120 transmits the voltage signal to the main control module 130 in a wireless transmission manner. More specifically, the wireless transmission method may be a LoRa transmission method.
In this embodiment, the coupled magnetic rod mechanism 110 includes a central magnetic rod 111, a coil 112, an outer shield layer 113, a handle 114, and the like.
In general, the central magnetic rod 111 has a cylindrical structure, the coil 112 is wound around the periphery of the central magnetic rod, and more specifically, the coil 112 is wound around the outer sidewall of the cylindrical central magnetic rod 111, in this embodiment, the number of turns of the coil is 2000 turns, an outer shielding layer 113 is disposed around the coil, generally, the outer shielding layer 113 has an insulating structure, and a handle 114 is disposed at one end of the central magnetic rod 111, in other words, the handle 114 is disposed on the upper bottom surface or the lower bottom surface of the cylindrical central magnetic rod 111. The handle 114 is primarily used to allow the operator room to handle the coupled bar magnet mechanism 110.
The voltage acquisition module 120 is electrically connected to the coupling bar magnet mechanism 110 through a signal line 140, and in detail, the voltage acquisition module 120 includes a signal amplification unit (not shown), for example, the signal amplification unit may be a power amplifier, and may amplify the electromagnetic signal acquired by the coupling bar magnet mechanism 110.
The main control module 130 has a resistive current testing host, and the main control module 130 receives the voltage acquired by the voltage acquisition module 120, and the resistive current testing host completes a testing experiment.
In the present embodiment, the coupling bar magnet mechanism 110 is a high-sensitivity coupling bar magnet, and generally, the coupling bar magnet mechanism 110 is placed outside the PT bottom case, and a leaked magnetic field signal is collected by using a magnetic field leaked from a transformer core inside the PT. Need not direct contact PT secondary terminal, alright satisfy the resistive current test to the arrester in power station.
The coupling bar magnet mechanism 110 in this embodiment is placed outside the PT bottom casing, but in this embodiment, the coupling bar magnet mechanism 110 may be placed at another position of the PT according to the actual application condition, so as to complete the collection of the leakage magnetic field signal.
In the embodiment, a special high-sensitivity coupling magnetic rod is adopted to collect a leakage magnetic field of the voltage transformer near a base of the voltage transformer as a resistive current test method of a reference voltage signal. The design key lies in that a leakage magnetic field of the voltage transformer is intercepted through the coupling magnetic rod to be amplified and restored to obtain a voltage signal. The accuracy of taking voltage signals from the PT side in the traditional test method is maintained, and various inconveniences of taking the voltage signals on site are fundamentally solved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A resistive current tester for a lightning arrester, comprising:
the coupling magnetic bar mechanism is used for collecting magnetic field signals leaked by the transformer core inside the PT;
the voltage acquisition module is electrically connected with the coupling magnetic bar mechanism and used for converting the magnetic field signal into a voltage signal;
and the main control module is used for receiving the voltage signal and using the voltage signal as a reference voltage for the resistive current test.
2. The resistive current tester for a lightning arrester of claim 1, wherein the voltage acquisition module transmits the voltage signal to the main control module by wireless transmission.
3. The resistive current tester for a lightning arrester of claim 2, wherein the wireless transmission mode is a WiFi transmission mode.
4. The resistive current tester for a lightning arrester of claim 1, wherein the coupled magnetic bar mechanism comprises:
a central magnetic rod;
a coil surrounding the periphery of the central magnetic rod;
an outer shield layer disposed around the coil;
and the handle is arranged at one end of the central magnetic rod.
5. The resistive current tester for a lightning arrester of claim 4 wherein the coil has 2000 turns.
6. The resistive current tester for a lightning arrester of claim 1, wherein the voltage acquisition module is electrically connected to the coupling bar magnet mechanism via a signal line.
7. The resistive current tester for a lightning arrester of claim 1 wherein the voltage acquisition module includes a signal amplification unit to signal amplify the magnetic field signal.
8. The resistive current tester for a lightning arrester of claim 1, wherein the coupling bar magnet mechanism is configured to be placed outside the PT bottom enclosure.
9. The resistive current tester for a lightning arrester of claim 1, wherein the master control module is electrically connected to the lightning arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920659326.3U CN210155229U (en) | 2019-05-09 | 2019-05-09 | Resistive current tester for lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920659326.3U CN210155229U (en) | 2019-05-09 | 2019-05-09 | Resistive current tester for lightning arrester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210155229U true CN210155229U (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920659326.3U Expired - Fee Related CN210155229U (en) | 2019-05-09 | 2019-05-09 | Resistive current tester for lightning arrester |
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| Country | Link |
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| CN (1) | CN210155229U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540248A (en) * | 2020-11-06 | 2021-03-23 | 广西电网有限责任公司南宁供电局 | Voltage and current signal double-wireless transmission lightning arrester live-line test system and method |
-
2019
- 2019-05-09 CN CN201920659326.3U patent/CN210155229U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540248A (en) * | 2020-11-06 | 2021-03-23 | 广西电网有限责任公司南宁供电局 | Voltage and current signal double-wireless transmission lightning arrester live-line test system and method |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200317 |