CN219179498U - Insulation resistance tester for shielding induced voltage - Google Patents
Insulation resistance tester for shielding induced voltage Download PDFInfo
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- CN219179498U CN219179498U CN202320250029.XU CN202320250029U CN219179498U CN 219179498 U CN219179498 U CN 219179498U CN 202320250029 U CN202320250029 U CN 202320250029U CN 219179498 U CN219179498 U CN 219179498U
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- insulation resistance
- induced voltage
- key
- test host
- resistance test
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model provides an insulation resistance tester for shielding induced voltage, comprising: an insulation resistance test host; the insulation resistance testing host is provided with a first wiring terminal and a second wiring terminal, the first wiring terminal is connected with a current limiting resistor, and the first wiring terminal, the current limiting resistor and the tested power transmission line are connected in series; the second wiring terminal is grounded. The insulation resistance tester for shielding the induced voltage can isolate the influence of the induced voltage on the tester, can accurately measure the insulation resistance of a circuit with the induced voltage, and has the advantages of simple structure and convenient operation.
Description
Technical Field
The utility model relates to the technical field of electricity, in particular to an insulation resistance tester for shielding induced voltage.
Background
At present, commonly used hand-operated and electronic insulation resistance testers are used for measuring insulation resistance of equipment conductors to a shell and ground after power failure of electrical equipment. However, after the power transmission line fails, the induced voltage below 6kV still exists on the failed power transmission line due to the mutual inductance phenomenon of the adjacent live lines. When the conventional insulation resistance tester is used for measuring the insulation of the line, the induced electricity can not only enable the insulation resistance of the line not to be measured by the meter, but also cause the damage of the insulation resistance meter.
Disclosure of Invention
The utility model provides an insulation resistance tester for shielding induced voltage, which aims to solve the problem that a conventional insulation resistance tester cannot measure insulation resistance of a power transmission line with stronger induction.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
an insulation resistance tester for shielding induced voltages, comprising:
an insulation resistance test host;
the insulation resistance testing host is provided with a first wiring terminal and a second wiring terminal, the first wiring terminal is connected with a current limiting resistor, and the first wiring terminal, the current limiting resistor and the tested power transmission line are connected in series;
the second wiring terminal is grounded.
Optionally, a first connection hole is formed in the insulation resistance testing host, and the insulation resistance testing host is connected with the first wiring terminal through the first connection hole.
Optionally, a second connection hole is formed in the insulation resistance testing host, and the insulation resistance testing host is connected with the second wiring terminal through the second connection hole.
Optionally, the insulation resistance testing host is further provided with a third wiring terminal, and the third wiring terminal is electrically connected with a high-voltage protection ring of the tested power transmission line.
Optionally, a third connection hole is formed in the insulation resistance testing host, and the insulation resistance testing host is connected with the third wiring terminal through the third connection hole.
Optionally, the insulation resistance test host is electrically connected with a display panel, a display screen for displaying the measured resistance value and keys are arranged on the display panel, and at least one key is electrically connected with the insulation resistance test host respectively.
Optionally, the key comprises at least one of the following:
a storage key;
a time setting key;
a backlight key;
an up select key;
the key is selected downwards.
Optionally, the storage key is electrically connected to a storage circuit, and the storage circuit includes:
a transistor;
the source electrode of the transistor is connected with the storage capacitor, the drain electrode of the transistor is connected with the column address line, and the grid electrode of the transistor is connected with the row address line.
Optionally, the resistance of the current limiting resistor is 1 megaohm.
The scheme of the utility model at least comprises the following beneficial effects:
the scheme of the utility model comprises the following steps: an insulation resistance test host; the insulation resistance testing host is provided with a first wiring terminal and a second wiring terminal, the first wiring terminal is connected with a current limiting resistor, and the first wiring terminal, the current limiting resistor and the tested power transmission line are connected in series; the second wiring terminal is grounded. The insulation resistance tester for shielding the induced voltage can isolate the influence of the induced voltage on the tester, can accurately measure the insulation resistance of a circuit with the induced voltage, and has the advantages of simple structure and convenient operation.
Drawings
FIG. 1 is a schematic diagram of an insulation resistance tester for shielding induced voltages according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an insulation resistance testing host according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a memory circuit according to an embodiment of the present utility model.
Reference numerals illustrate:
11. an insulation resistance test host; 111. a first connection hole; 112. a second connection hole; 113. a third connection hole; 114. a display panel; 115. a key; 116. a display screen; 12. a first connection terminal; 13. a second connection terminal; 14. a third connection terminal; 2. a current limiting resistor; t, a transistor; C. and a storage capacitor.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, an embodiment of the present utility model provides an insulation resistance tester for shielding induced voltage, including:
an insulation resistance test host 11;
the insulation resistance test host 11 is provided with a first wiring terminal 12 and a second wiring terminal 13, the first wiring terminal 12 is connected with a current limiting resistor 2, and the first wiring terminal 12, the current limiting resistor 2 and a tested power transmission line are connected in series;
the second connection terminal 13 is grounded.
In this embodiment, the first connection terminal 12 is a test terminal, and the second connection terminal 13 is a ground terminal. The first connection interface 121 is connected to a current limiting resistor 2, and the first connection terminal 12 is connected to the other end of the current limiting resistor 2. After the first wiring terminal 12 is connected with the power transmission line to be tested, the current entering the insulation resistance test host 11 can be reduced through the current limiting resistor 2, so that the working safety of the insulation resistance tester is ensured, the problem that the insulation resistance with an induced voltage line cannot be measured is effectively solved, and the method is simple and easy to use and has a remarkable effect.
In an alternative embodiment of the present utility model, the insulation resistance testing host 11 is provided with a first connection hole 111, and the insulation resistance testing host 11 is connected to the first connection terminal 12 through the first connection hole 111.
In this embodiment, the first connection terminal 12 is connected with the insulation resistance testing host 11 in a pluggable manner through the first connection hole 111, so that the connection terminal is more convenient to connect and is convenient to carry.
In an alternative embodiment of the present utility model, a second connection hole 112 is provided on the insulation resistance testing host 11, and the insulation resistance testing host 11 is connected to the second connection terminal 13 through the second connection hole 112.
In this embodiment, the second connection terminal 13 is connected with the insulation resistance testing host 11 in a pluggable manner through the second connection hole 112, so that the connection terminal is more convenient to connect and is convenient to carry.
In an alternative embodiment of the present utility model, the insulation resistance testing host 11 further has a third connection terminal 14, which is electrically connected to the high voltage protection ring of the tested transmission line.
In an alternative embodiment of the present utility model, a third connection hole 113 is provided on the insulation resistance testing host 11, and the insulation resistance testing host 11 is connected to the third connection terminal 14 through the third connection hole 113.
In the above embodiment of the present utility model, the third connection terminal 14 is a shielding terminal, and is connected to the high voltage protection ring of the transmission line under test. In the measurement process, the third connecting terminal 14 outputs negative polarity direct current high voltage, so that the current leaked from the surface of the power transmission line can be eliminated, the influence of the spatially distributed capacitance is shielded, and the accuracy of the measurement result is improved.
In an alternative embodiment of the present utility model, the insulation resistance testing host 11 is electrically connected to a display panel 114, a display 116 for displaying the measured resistance value and keys 115 are disposed on the display panel 114, and at least one of the keys 115 is electrically connected to the insulation resistance testing host 11.
In this embodiment, as shown in fig. 2, the display panel 114 is disposed on the insulation resistance testing host 11, and includes a display 116 and a key 115;
the key 115 is used to set different functions of the insulation resistance testing host machine, and the display 116 can display a plurality of data such as measured resistance values, instrument working states, testing time and the like.
In an alternative embodiment of the present utility model, the key 115 includes at least one of:
a storage key;
a time setting key;
a backlight key;
an up select key;
the key is selected downwards.
In this embodiment, the storage key is used to store data or view historical test data, and all stored data can be deleted after long pressing for more than 3 seconds;
the time setting key is used for setting test time;
the backlight key is used for lighting backlight of the display screen;
the upward selection key is used for forward scrolling data or modifying data;
the down select key is used to scroll back through the data or modify the data.
In an alternative embodiment of the present utility model, the memory key is electrically connected to a memory circuit, the memory circuit comprising:
a transistor T;
the source electrode of the transistor T is connected with the storage capacitor C, the drain electrode of the transistor T is connected with the column address line, and the grid electrode of the transistor T is connected with the row address line.
In this embodiment, as shown in fig. 3, the memory circuit includes a transistor T, a source electrode of the transistor T is connected to the storage capacitor C, a drain electrode of the transistor T is connected to the column address line, and a gate electrode of the transistor T is connected to the row address line.
The potential of the transistor T changes after the capacitor C is charged; the potential of the source electrode of the transistor T changes along with the potential of the capacitor, and forms a potential difference with the drain electrode; when the potential of the capacitor C is lower than a predetermined value, data 0 is represented, and when the potential is higher than a predetermined value, data 1 is represented, and data storage of the memory circuit is realized.
In the memory circuit adopted in the embodiment, only one transistor is needed for one memory cell, so that the integration level is good, and the cost is low.
In an alternative embodiment of the present utility model, the resistance of the current limiting resistor 2 is 1 megaohm, so that the current value flowing into the insulation resistance testing host 11 can be effectively reduced, and the insulation resistance tester is protected from being damaged.
Alternatively, other resistors with different resistance values can be adopted, so long as the insulation resistance tester can be ensured to work safely, and accurate measurement of the insulation resistance can be realized.
The insulation resistance tester for shielding induced voltage according to the embodiment of the utility model has the following specific working modes:
confirm that the circuit has been cut off, place insulating pad in the workplace, operating personnel and instrument are all on insulating pad.
Connecting the insulation resistance test host 11 with the second wiring terminal 13 and grounding the connection terminal to confirm that the grounding point contact is good; the first wiring terminal 12 is connected with the current limiting resistor 2 and is connected with the insulation resistor testing host 11; and the third connecting terminal 14 is connected to a high-voltage protection ring of the tested power transmission line to shield interference.
Starting the insulation resistance test host 11 to measure the insulation resistance of the line with induction electricity, and subtracting the resistance value of the current-limiting resistor 2 from the measurement result displayed by the display 116 to obtain the actual insulation resistance of the line to be tested.
The insulation resistance tester for shielding induced voltage effectively solves the problem that insulation resistance cannot be measured by an induced electric circuit, is simple and easy to use, has obvious effect and is applied to 110kV circuits.
While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.
Claims (9)
1. An insulation resistance tester for shielding induced voltage, comprising:
an insulation resistance test host (11);
the insulation resistance test host (11) is provided with a first wiring terminal (12) and a second wiring terminal (13), the first wiring terminal (12) is connected with a current limiting resistor (2), and the first wiring terminal (12) and the current limiting resistor (2) are connected in series with a tested power transmission line;
the second connecting terminal (13) is grounded.
2. The insulation resistance tester for shielding induced voltage according to claim 1, wherein a first connection hole (111) is provided on the insulation resistance test host (11), and the insulation resistance test host (11) is connected with the first connection terminal (12) through the first connection hole (111).
3. The insulation resistance tester for shielding induced voltage according to claim 1, wherein a second connection hole (112) is provided on the insulation resistance test host (11), and the insulation resistance test host (11) is connected with the second connection terminal (13) through the second connection hole (112).
4. The insulation resistance tester for shielding induced voltage according to claim 1, wherein the insulation resistance test host (11) further has a third connection terminal (14) electrically connected to a high voltage guard ring of the power transmission line under test.
5. The insulation resistance tester for shielding induced voltage according to claim 4, wherein a third connection hole (113) is provided on the insulation resistance test host (11), and the insulation resistance test host (11) is connected with the third connection terminal (14) through the third connection hole (113).
6. The insulation resistance tester for shielding induced voltage according to claim 1, wherein the insulation resistance test host (11) is electrically connected with a display panel (114), a display screen (116) for displaying measured resistance values and keys (115) are arranged on the display panel (114), and at least one key (115) is electrically connected with the insulation resistance test host (11) respectively.
7. The insulation resistance tester shielding induced voltage according to claim 6, wherein the key (115) includes at least one of:
a storage key;
a time setting key;
a backlight key;
an up select key;
the key is selected downwards.
8. The insulation resistance tester shielding induced voltage according to claim 7, wherein the memory key is electrically connected to a memory circuit, the memory circuit comprising:
a transistor (T);
the source electrode of the transistor (T) is connected with the storage capacitor (C), the drain electrode is connected with the column address line, and the grid electrode is connected with the row address line.
9. The insulation resistance tester for shielding induced voltage according to claim 1, wherein the current limiting resistor (2) has a resistance value of 1 megaohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320250029.XU CN219179498U (en) | 2023-02-17 | 2023-02-17 | Insulation resistance tester for shielding induced voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320250029.XU CN219179498U (en) | 2023-02-17 | 2023-02-17 | Insulation resistance tester for shielding induced voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219179498U true CN219179498U (en) | 2023-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320250029.XU Active CN219179498U (en) | 2023-02-17 | 2023-02-17 | Insulation resistance tester for shielding induced voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219179498U (en) |
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2023
- 2023-02-17 CN CN202320250029.XU patent/CN219179498U/en active Active
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