CN219715609U - Arrester operation quality on-line monitoring device for switch cabinet structure - Google Patents
Arrester operation quality on-line monitoring device for switch cabinet structure Download PDFInfo
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- CN219715609U CN219715609U CN202223289652.0U CN202223289652U CN219715609U CN 219715609 U CN219715609 U CN 219715609U CN 202223289652 U CN202223289652 U CN 202223289652U CN 219715609 U CN219715609 U CN 219715609U
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- switch cabinet
- monitoring device
- lightning arrester
- phase
- lightning
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 33
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Abstract
The utility model provides an on-line monitoring device for the operation quality of a lightning arrester of a switch cabinet structure, which is used for monitoring the operation quality of the lightning arrester, wherein three lightning arresters are respectively arranged in a three-phase circuit of the switch cabinet structure; the on-line monitoring device comprises a current monitoring device which is connected in series between the bottom of the lightning arrester and the grounding part, and a collecting and analyzing device which is arranged in a secondary equipment room of the switch cabinet; the current monitoring device is used for monitoring leakage current signals of the lightning arrester of the lower cabinet of the switch cabinet flowing to the ground; the collecting and analyzing device collects secondary voltages of each phase on a metering bus bar on the top layer of the switch cabinet, and collects leakage currents of each phase through a current monitoring device at a lightning arrester at a three-phase position; the utility model can promote the efficient and safe use and maintenance of equipment.
Description
Technical Field
The utility model relates to the technical field of power equipment, in particular to an on-line monitoring device for the operation quality of a lightning arrester of a switch cabinet structure.
Background
The lightning arrester is overvoltage protection equipment, is widely applied to power systems, and the most common zinc oxide lightning arrester can gradually age or enter water to be wet under the operating voltage. Arrester monitoring includes full (leakage) current monitoring, resistive current monitoring, and power loss monitoring. The operation quality of the lightning arrester mainly refers to the sealing performance and the valve plate operation stability, wherein the sealing performance is mainly monitored by full (leakage) current; the running stability of the valve plate is mainly monitored by means of resistive current; the power consumption directly reflects the degradation process of the arrester. In order to detect the defects of damp and degradation, the operation conditions of the defects need to be closely monitored, and the defects are timely found to be the purpose of state maintenance.
The existing lightning arrester on-line measurement technology is various, but the switch cabinet is of a closed structure and cannot be opened in live operation.
Meanwhile, due to the fact that the switch chamber is narrow, the existing lightning arresters are arranged in a horizontal row mode, and under normal working conditions, due to the fact that stray capacitance exists between phases, certain interference can be generated on the lightning arresters of the phases. On the one hand, the voltage of the phase is affected, and on the other hand, the stray capacitance between other phases is also affected.
The utility model provides an on-line monitoring method for the operation quality of a lightning arrester of a switch cabinet structure, which is characterized in that an acquisition and analysis unit is arranged in a secondary equipment room of the switch cabinet, and meanwhile, the installation position of the lightning arrester is optimized, so that the efficient and safe use and maintenance of equipment can be promoted.
Disclosure of Invention
The utility model provides an on-line monitoring device for the operation quality of a lightning arrester of a switch cabinet structure, which can promote the efficient and safe use and maintenance of equipment.
The utility model adopts the following technical scheme.
An on-line monitoring device for the operation quality of a lightning arrester of a switch cabinet structure is used for monitoring the operation quality of the lightning arrester, and three lightning arresters are respectively arranged on a three-phase circuit of the switch cabinet structure; the on-line monitoring device comprises a current monitoring device which is connected in series between the bottom of the lightning arrester and the grounding part, and a collecting and analyzing device which is arranged in a secondary equipment room of the switch cabinet; the current monitoring device is used for monitoring leakage current signals of the lightning arrester of the lower cabinet of the switch cabinet flowing to the ground; the collecting and analyzing device collects secondary voltages of each phase on the metering bus bar on the top layer of the switch cabinet, and collects leakage currents of each phase through the current monitoring device at the lightning arrester at the three-phase position.
The three lightning arresters are respectively arranged at the parts of the three-phase circuit of the switch cabinet, the three lightning arresters are distributed in the same horizontal plane according to a regular triangle, and a cable of a feeder line of the switch cabinet penetrates out of the switch cabinet from the regular triangle formed by the three lightning arresters.
The collecting and analyzing device triggers the valve plate operation stability alarm of the lightning arrester in a parallel trigger mode based on two resistive current calculated values, wherein one of the two resistive current calculated values is a resistive current value calculated by the secondary voltage of each phase and the leakage current of the lightning arrester flowing to the ground, and the other is a resistive current value synchronously calculated by the sum of the leakage currents of the three-phase lightning arrester.
The online monitoring device does not comprise a PT device.
The utility model can measure the leakage current sum of the three-phase lightning arrester, and can realize data double insurance and improve the stability of equipment when the data of the current sum is synchronously used for calculating the resistive current.
In order to ensure the safety of a power grid, the utility model triggers an alarm signal in a parallel triggering mode, provides double insurance for realizing more stable operation of a switch cabinet, and can effectively avoid the risk of larger errors of resistive current of a lightning arrester in different periods in different measuring methods.
According to the utility model, the installation layout of the three-phase lightning arrester is optimized according to the installation position of the lightning arrester of the switch cabinet, so that a regular triangle is formed, and the cable of the feeder line of the switch cabinet passes out of the regular triangle.
Drawings
The utility model is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic illustration of the deployment of the present utility model within a switchgear cabinet;
FIG. 2 is a schematic diagram of the electrical principle of the present utility model;
fig. 3 is a schematic diagram of the equivalent circuit principle of a three-phase lightning arrester;
fig. 4 is a schematic view of the lightning arresters distributed in regular triangle in the present utility model;
in the figure: 1-a collection and analysis device; 2-lightning arresters; 3-current monitoring device.
Detailed Description
As shown in the figure, an on-line monitoring device for the operation quality of a lightning arrester of a switch cabinet structure is used for monitoring the operation quality of the lightning arrester, and three lightning arresters 2 are respectively arranged in a three-phase circuit of the switch cabinet structure; the on-line monitoring device comprises a current monitoring device 3 which is connected in series between the bottom of the lightning arrester and the grounding part, and a collecting and analyzing device 1 which is arranged in a secondary equipment room of the switch cabinet; the current monitoring device is used for monitoring leakage current signals of the lightning arrester of the lower cabinet of the switch cabinet flowing to the ground; the collecting and analyzing device collects secondary voltages of each phase on the metering bus bar on the top layer of the switch cabinet, and collects leakage currents of each phase through the current monitoring device at the lightning arrester at the three-phase position.
The three lightning arresters are respectively arranged at the parts of the three-phase circuit of the switch cabinet, the three lightning arresters are distributed in the same horizontal plane according to a regular triangle, and a cable of a feeder line of the switch cabinet penetrates out of the switch cabinet from the regular triangle formed by the three lightning arresters.
The collecting and analyzing device triggers the valve plate operation stability alarm of the lightning arrester in a parallel trigger mode based on two resistive current calculated values, wherein one of the two resistive current calculated values is a resistive current value calculated by the secondary voltage of each phase and the leakage current of the lightning arrester flowing to the ground, and the other is a resistive current value synchronously calculated by the sum of the leakage currents of the three-phase lightning arrester.
The online monitoring device does not comprise a PT device.
Example 1:
in this example, based on the switch cabinet structure, the design is split type.
In this example, the hardware part is divided into three main categories, the first category is a current monitoring device which is serially installed between the bottom of the lightning arrester and the ground, and is used for monitoring leakage current of the lightning arrester. The second type is installed in the indoor collection and analysis device of the secondary equipment of the switch cabinet. The third type is a cable connection part, and the metering voltage under the bus bar and the lightning arrester leakage current signal of the lower cabinet of the switch cabinet can be transmitted through cable connection, and the schematic diagram of the third type is shown in fig. 1. Only a single arrester is drawn in fig. 1, there are actually three arresters, and a current monitoring device is connected in series under each arrester. The voltage signal is derived from the voltage on the metering busbar at the top layer of the switch cabinet, which saves the cost of adding the PT device compared with the traditional design.
Example 2:
in this example, the electrical schematic is shown in FIG. 2. The lightning arrester collecting and analyzing device can further perform resistive current by acquiring secondary voltage of each phase and leakage current of the lightning arrester flowing to the ground, and the calculation and analysis modes of the lightning arrester collecting and analyzing device belong to conventional methods and are not described.
In the embodiment, the leakage current sum of the three-phase lightning arrester is also introduced and is synchronously used for calculating the resistive current, so that the data double insurance is realized, and the stability of the equipment is improved. The design is that the lightning arrester has larger errors in different measuring methods in different periods of resistive current, so that the safety of a power grid is ensured, an alarm signal is triggered in a parallel triggering mode, and double insurance is provided for realizing more stable operation of the switch cabinet.
Example 3:
in this example, the lightning arresters are arranged in a row, and under normal working conditions, due to stray capacitance between the phases, certain interference can be generated to the lightning arresters of the phases. On one hand, the three-phase lightning arrester is influenced by the voltage of the current phase, on the other hand, the three-phase lightning arrester is also influenced by other inter-phase stray capacitances, and the equivalent circuit schematic diagram of the three-phase lightning arrester is shown in figure 3. It was found that both phases A, B, C would be affected by the adjacent phases, and in particular phase B would be affected by the mixing disturbance of both phases A, C, which is the effect of the accuracy of the resistive current.
Therefore, the switch cabinet is designed to be installed with a lightning arrester, and the structure of the switch cabinet is shown in fig. 4. The three-phase lightning arrester is installed in the red circle side, and it becomes a regular triangle, and the cable of cubical switchboard feeder wears out in the regular triangle, and the interference of B looks just can be reduced to this kind of design for the three-phase receives the interference of distributed capacitance to tend to be unanimous, and then improves resistive current's degree of accuracy.
Claims (4)
1. An arrester operation quality on-line monitoring device for cubical switchboard structure for monitor the operation quality of arrester, its characterized in that: three lightning arresters are respectively arranged on the three-phase circuit of the switch cabinet structure; the on-line monitoring device comprises a current monitoring device which is connected in series between the bottom of the lightning arrester and the grounding part, and a collecting and analyzing device which is arranged in a secondary equipment room of the switch cabinet; the current monitoring device is used for monitoring leakage current signals of the lightning arrester of the lower cabinet of the switch cabinet flowing to the ground; the collecting and analyzing device collects secondary voltages of each phase on the metering bus bar on the top layer of the switch cabinet, and collects leakage currents of each phase through the current monitoring device at the lightning arrester at the three-phase position.
2. An on-line monitoring device for the operational quality of a lightning arrester for a switchgear structure according to claim 1, characterized in that: the three lightning arresters are respectively arranged at the parts of the three-phase circuit of the switch cabinet, the three lightning arresters are distributed in the same horizontal plane according to a regular triangle, and a cable of a feeder line of the switch cabinet penetrates out of the switch cabinet from the regular triangle formed by the three lightning arresters.
3. An on-line monitoring device for the operational quality of a lightning arrester for a switchgear structure according to claim 1, characterized in that: the collecting and analyzing device triggers the valve plate operation stability alarm of the lightning arrester in a parallel trigger mode based on two resistive current calculated values, wherein one of the two resistive current calculated values is a resistive current value calculated by the secondary voltage of each phase and the leakage current of the lightning arrester flowing to the ground, and the other is a resistive current value synchronously calculated by the sum of the leakage currents of the three-phase lightning arrester.
4. An on-line monitoring device for the operational quality of a lightning arrester for a switchgear structure according to claim 1, characterized in that: the online monitoring device does not comprise a PT device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223289652.0U CN219715609U (en) | 2022-12-08 | 2022-12-08 | Arrester operation quality on-line monitoring device for switch cabinet structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223289652.0U CN219715609U (en) | 2022-12-08 | 2022-12-08 | Arrester operation quality on-line monitoring device for switch cabinet structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219715609U true CN219715609U (en) | 2023-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223289652.0U Active CN219715609U (en) | 2022-12-08 | 2022-12-08 | Arrester operation quality on-line monitoring device for switch cabinet structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219715609U (en) |
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2022
- 2022-12-08 CN CN202223289652.0U patent/CN219715609U/en active Active
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