CN220438447U - Lightning arrester resistive current monitoring device - Google Patents
Lightning arrester resistive current monitoring device Download PDFInfo
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- CN220438447U CN220438447U CN202321985423.4U CN202321985423U CN220438447U CN 220438447 U CN220438447 U CN 220438447U CN 202321985423 U CN202321985423 U CN 202321985423U CN 220438447 U CN220438447 U CN 220438447U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 61
- 238000012545 processing Methods 0.000 claims abstract description 34
- 230000001360 synchronised effect Effects 0.000 claims abstract description 23
- 230000006698 induction Effects 0.000 claims abstract description 19
- 230000001939 inductive effect Effects 0.000 claims abstract description 7
- 208000025274 Lightning injury Diseases 0.000 claims description 11
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 230000005684 electric field Effects 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Abstract
The utility model discloses a lightning arrester resistive current monitoring device which comprises a voltage signal induction sensor, a voltage signal processing module, a power frequency current transformer, a power frequency current processing module, a high-frequency current transformer, a high-frequency current processing module, a synchronous AD sampling module and an MCU module. The utility model provides a lightning arrester resistive current monitoring device, which adopts an inductive bus voltage sampling technology to monitor the lightning arrester resistive current, thereby reducing the cost and not affecting the stability of the original system.
Description
Technical Field
The utility model relates to a lightning arrester resistive current monitoring device, and belongs to the technical field of intelligent on-line monitoring, diagnosis and early warning.
Background
At present, zinc oxide (MOA) lightning arresters have the advantages of being high in through-flow capacity, simple in internal structure, light in self weight, small in maintenance workload and the like due to excellent protection characteristics, so that the lightning arresters are widely applied to power systems. The performance of the MOA arrester directly influences the safe operation of a power system, the MOA arrester can be aged gradually under the action of power frequency high voltage for a long time, and the aging of the MOA arrester is found to be insufficient by means of one-time preventive test in one year, even if the MOA arrester is qualified in the preventive test, breakdown damage can occur in operation, the protection characteristic is reduced, and extremely serious consequences can be generated.
Therefore, in order to ensure the safe operation of the MOA arrester, strict state monitoring must be performed on the MOA arrester, so as to monitor parameters such as leakage current, resistive current and action count of the arrester in operation, wherein the resistive current is an index of whether the arrester is aged most sensitively, the resistive current of the arrester is calculated by a fundamental wave phase difference between a voltage signal of a high-voltage bus and a current signal of the leakage current of the arrester through COS theta, the phase difference between the fundamental wave current and the fundamental wave voltage can reflect the aging degree of the arrester, and the traditional voltage sampling needs to remove a voltage signal from the secondary side of the high-voltage transformer, and the defects are that: 1. besides a current sampling sensor and a voltage sampling sensor, the measuring lightning arrester increases the cost; 2. the secondary side of the high-voltage transformer has only 2 groups of voltage outputs, which are generally used for metering and protection, and if a group of samples is added, the stability of the original system can be affected.
Disclosure of Invention
The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing the lightning arrester resistive current monitoring device, which adopts an inductive bus voltage sampling technology to monitor the lightning arrester resistive current, thereby reducing the cost and not affecting the stability of the original system.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
a lightning arrester resistive current monitoring device comprises a voltage signal induction sensor, a voltage signal processing module, a power frequency current transformer, a power frequency current processing module, a high frequency current transformer, a high frequency current processing module, a synchronous AD sampling module and an MCU module;
the voltage signal induction sensor is used for inducing bus voltage and is connected with the input end of the synchronous AD sampling module through the voltage signal processing module;
the power frequency current transformer is used for inducing the leakage full current of the lightning arrester and is connected with the input end of the synchronous AD sampling module through the power frequency current processing module;
the output end of the synchronous AD sampling module is connected with the MCU module;
the high-frequency current transformer is used for collecting high-frequency discharge signals of the lightning arrester to the ground and counting lightning strokes, and is connected with the MCU module through the high-frequency current processing module.
Further, the voltage signal processing module comprises a first protection circuit, a first sampling filter circuit and a first differential amplifying circuit, wherein the input end of the first protection circuit is connected with the voltage signal induction sensor, the output end of the first protection circuit is connected with the input end of the first sampling filter circuit, the output end of the first sampling filter circuit is connected with the input end of the first differential amplifying circuit, and the output end of the first differential amplifying circuit is connected with the input end of the synchronous AD sampling module.
Further, the power frequency current processing module comprises a second protection circuit, a second sampling filter circuit, a first-stage differential amplifying circuit and a second-stage differential amplifying circuit, wherein the input end of the second protection circuit is connected with a power frequency current transformer, the output end of the second protection circuit is connected with the input end of the second sampling filter circuit, the output end of the second sampling filter circuit is connected with the input end of the first-stage differential amplifying circuit, the output end of the first-stage differential amplifying circuit is connected with the input end of the second-stage differential amplifying circuit, and the output end of the second-stage differential amplifying circuit is connected with the input end of the synchronous AD sampling module.
Further, the high-frequency current processing module comprises a third protection circuit, a third sampling filter circuit and a comparator, wherein the input end of the third protection circuit is connected with the high-frequency current transformer, the output end of the third protection circuit is connected with the input end of the third sampling filter circuit, the output end of the third sampling filter circuit is connected with the input end of the comparator, and the output end of the comparator is connected with the MCU module.
Further, the system also comprises a local display module, wherein the local display module is connected with the MCU module.
Further, the wireless lora communication module is further included, and the wireless lora communication module is connected with the MCU module.
By adopting the technical scheme, the utility model adopts the induction bus voltage sampling technology to monitor the resistive current of the lightning arrester, combines the power frequency current transformer to induce the leakage full current of the lightning arrester, simultaneously utilizes the high-frequency current transformer to collect the ground high-frequency discharge signal to carry out lightning stroke counting, carries out strict state monitoring on the MOA lightning arrester, and monitors parameters such as the leakage current, the resistive current, the lightning stroke action counting and the like of the lightning arrester in operation. The MOA lightning arrester is guaranteed to run safely, the cost is reduced, and the stability of an original system is not affected.
Drawings
Fig. 1 is a schematic block diagram of a lightning arrester resistive current monitoring device of the present utility model;
FIG. 2 is a schematic circuit diagram of an MCU module according to the present utility model;
FIG. 3 is a schematic circuit diagram of a voltage signal processing module according to the present utility model;
FIG. 4 is a schematic circuit diagram of a power frequency current processing module according to the present utility model;
FIG. 5 is a schematic circuit diagram of a high frequency current processing module according to the present utility model;
FIG. 6 is a schematic circuit diagram of a wireless lora communication module of the present utility model;
FIG. 7 is a schematic circuit diagram of a synchronous AD sampling module of the present utility model;
fig. 8 is a schematic circuit diagram of a power module according to the present utility model.
Detailed Description
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As shown in fig. 1 to 8, the present embodiment provides a resistive current monitoring device for a lightning arrester, which includes a voltage signal induction sensor, a voltage signal processing module, a power frequency current transformer, a power frequency current processing module, a high frequency current transformer, a high frequency current processing module, a synchronous AD sampling module and an MCU module.
As shown in FIG. 7, the synchronous AD sampling module adopts an AD7606 chip, and comprises 3 paths of sampling interfaces, 1 path of voltage acquisition and 2 paths of power frequency current acquisition. The MCU module issues a synchronous acquisition instruction, the AD7606 chip acquires one path of voltage signal and 2 paths of current signals simultaneously, and converts the acquired power frequency signal into digital quantity to be transmitted to the MCU module for operation.
As shown in fig. 1, the voltage signal induction sensor of the present embodiment is used for inducing the bus voltage, and the voltage signal induction sensor is connected with the input end of the synchronous AD sampling module through the voltage signal processing module. As shown in fig. 3, the voltage signal processing module includes a first protection circuit, a first sampling filter circuit and a first differential amplifying circuit, where an input end of the first protection circuit is connected to the voltage signal induction sensor, an output end of the first protection circuit is connected to an input end of the first sampling filter circuit, an output end of the first sampling filter circuit is connected to an input end of the first differential amplifying circuit, and an output end of the first differential amplifying circuit is connected to an input end of the synchronous AD sampling module.
The principle of electric field coupling between a voltage signal induction sensor and a high-voltage alternating electric field is utilized to perform induction type (non-contact) measurement outside a safe distance. The voltage signal induction sensor generates induction charges under the action of an alternating electric field, and an induction current is formed to serve as an input signal of the lightning arrester resistive current monitoring device. The voltage signal induction sensor generates an alternating current signal under the action of a high-voltage alternating electric field, and the induction current signal is transmitted to the voltage signal processing module through a cable. The signals are filtered by a protection circuit and a sampling filter circuit, various higher harmonic signals are effectively removed, power frequency 50Hz signals are output, and then the signals are amplified, enter a synchronous AD sampling module to be quantized into digital signals, and the digital signals are transmitted to an MCU module to be subjected to fast Fourier transform to calculate fundamental wave voltage and initial phase.
As shown in fig. 1, the power frequency current transformer of the present embodiment is used for sensing the leakage full current of the lightning arrester, and is connected with the input end of the synchronous AD sampling module through the power frequency current processing module. As shown in fig. 4, the power frequency current processing module includes a second protection circuit, a second sampling filter circuit, a first differential amplifying circuit and a second differential amplifying circuit, where an input end of the second protection circuit is connected with a power frequency current transformer, an output end of the second protection circuit is connected with an input end of the second sampling filter circuit, an output end of the second sampling filter circuit is connected with an input end of the first differential amplifying circuit, an output end of the first differential amplifying circuit is connected with an input end of the second differential amplifying circuit, and an output end of the second differential amplifying circuit is connected with an input end of the synchronous AD sampling module.
The leakage full current of the lightning arrester is induced by using a power frequency current transformer (the leakage full current comprises capacitive current, resistive current and various harmonic currents), signals are filtered by a protection circuit and a sampling filter circuit, various higher harmonic signals are effectively removed, a power frequency 50Hz signal is output, and the signals are subjected to secondary differential amplification treatment and enter a synchronous AD sampling module to be quantized into digital signals, and fast Fourier transform is carried out on the digital signals to calculate fundamental wave current and primary phase for an MCU module.
As shown in fig. 1, the high-frequency current transformer in this embodiment is used for collecting the high-frequency discharge signal of the lightning arrester to the ground and counting lightning strokes, and is connected with the MCU module through the high-frequency current processing module. As shown in fig. 5, the high-frequency current processing module includes a third protection circuit, a third sampling filter circuit and a comparator, where an input end of the third protection circuit is connected with the high-frequency current transformer, an output end of the third protection circuit is connected with an input end of the third sampling filter circuit, an output end of the third sampling filter circuit is connected with an input end of the comparator, and an output end of the comparator is connected with the MCU module.
The bus voltage generates lightning stroke or overvoltage, the internal resistance of the lightning arrester becomes small, and the lightning arrester releases impact current to the ground, thereby playing a role of clamping. The high-frequency current transformer collects high-frequency discharge signals of the lightning arrester to the ground, lightning stroke counting is carried out, lightning stroke current signal sampling is carried out through the protection circuit, the sampling and filtering circuit is used for filtering, the lightning stroke current signal sampling enters the voltage comparator, and when the discharge threshold value (larger than the amplitude of the primary core penetrating 50A) is exceeded, the comparator outputs high level to trigger the external interrupt counting of the MCU module.
As shown in fig. 2, the MCU module of the present embodiment collects current-voltage signals, first determines which range the collected current is in, and then performs the operation of the voltage-current fundamental wave effective value, the fundamental wave phase and the resistive current, where the specific formula is as follows:
phase difference: Δφ= (ωt+φi) - (ωt+φu) =φi- φu;
wherein DeltaPhi represents the fundamental phase difference between the leakage current of the lightning arrester and the bus voltage, and phiu and phii represent the fundamental primary phases of the bus voltage and the leakage current of the lightning arrester.
Resistive component: ir=ix×cos (ΔΦ)
Wherein Ir represents the resistive current of the MOA arrester to the ground, and Ix represents the fundamental wave full current of the arrester to the ground.
As shown in fig. 1, the lightning arrester resistive current monitoring device of the present embodiment further includes a local display module, where the local display module is connected to the MCU module. The local display module can adopt a liquid crystal display screen and is used for displaying parameters such as MOA lightning arrester fundamental wave full current, lightning stroke action times, MOA resistive current and the like on site.
As shown in fig. 1 and 6, the lightning arrester resistive current monitoring device of the present embodiment further includes a wireless lora communication module, where the wireless lora communication module is connected to the MCU module. The MCU module transmits the parameters of the measured MOA arrester fundamental wave full current, lightning stroke action times, MOA resistive current and the like to the upper stage platform in a wireless uplink manner.
As shown in fig. 1 and 8, each module circuit in the lightning arrester resistive current monitoring device of the present embodiment is powered by a power module.
The technical problems, technical solutions and advantageous effects solved by the present utility model have been further described in detail in the above-described embodiments, and it should be understood that the above-described embodiments are only illustrative of the present utility model and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present utility model should be included in the scope of protection of the present utility model.
Claims (6)
1. A lightning arrester resistive current monitoring device is characterized in that: the device comprises a voltage signal induction sensor, a voltage signal processing module, a power frequency current transformer, a power frequency current processing module, a high-frequency current transformer, a high-frequency current processing module, a synchronous AD sampling module and an MCU module;
the voltage signal induction sensor is used for inducing bus voltage and is connected with the input end of the synchronous AD sampling module through the voltage signal processing module;
the power frequency current transformer is used for inducing the leakage full current of the lightning arrester and is connected with the input end of the synchronous AD sampling module through the power frequency current processing module;
the output end of the synchronous AD sampling module is connected with the MCU module;
the high-frequency current transformer is used for collecting high-frequency discharge signals of the lightning arrester to the ground and counting lightning strokes, and is connected with the MCU module through the high-frequency current processing module.
2. The lightning arrester resistive current monitoring device of claim 1, wherein: the voltage signal processing module comprises a first protection circuit, a first sampling filter circuit and a first differential amplifying circuit, wherein the input end of the first protection circuit is connected with the voltage signal induction sensor, the output end of the first protection circuit is connected with the input end of the first sampling filter circuit, the output end of the first sampling filter circuit is connected with the input end of the first differential amplifying circuit, and the output end of the first differential amplifying circuit is connected with the input end of the synchronous AD sampling module.
3. The lightning arrester resistive current monitoring device of claim 1, wherein: the power frequency current processing module comprises a second protection circuit, a second sampling filter circuit, a first-stage differential amplifying circuit and a second-stage differential amplifying circuit, wherein the input end of the second protection circuit is connected with a power frequency current transformer, the output end of the second protection circuit is connected with the input end of the second sampling filter circuit, the output end of the second sampling filter circuit is connected with the input end of the first-stage differential amplifying circuit, the output end of the first-stage differential amplifying circuit is connected with the input end of the second-stage differential amplifying circuit, and the output end of the second-stage differential amplifying circuit is connected with the input end of the synchronous AD sampling module.
4. The lightning arrester resistive current monitoring device of claim 1, wherein: the high-frequency current processing module comprises a third protection circuit, a third sampling filter circuit and a comparator, wherein the input end of the third protection circuit is connected with the high-frequency current transformer, the output end of the third protection circuit is connected with the input end of the third sampling filter circuit, the output end of the third sampling filter circuit is connected with the input end of the comparator, and the output end of the comparator is connected with the MCU module.
5. The lightning arrester resistive current monitoring device of claim 1, wherein: the system also comprises a local display module, wherein the local display module is connected with the MCU module.
6. The lightning arrester resistive current monitoring device of claim 1, wherein: the wireless lora communication module is connected with the MCU module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321985423.4U CN220438447U (en) | 2023-07-27 | 2023-07-27 | Lightning arrester resistive current monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321985423.4U CN220438447U (en) | 2023-07-27 | 2023-07-27 | Lightning arrester resistive current monitoring device |
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| Publication Number | Publication Date |
|---|---|
| CN220438447U true CN220438447U (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321985423.4U Active CN220438447U (en) | 2023-07-27 | 2023-07-27 | Lightning arrester resistive current monitoring device |
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| CN (1) | CN220438447U (en) |
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- 2023-07-27 CN CN202321985423.4U patent/CN220438447U/en active Active
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