CN112415342A - Intermediate joint system and partial discharge monitoring method - Google Patents
Intermediate joint system and partial discharge monitoring method Download PDFInfo
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The invention discloses an intermediate joint system and a partial discharge monitoring method, wherein the intermediate joint system comprises an intermediate joint, the intermediate joint comprises an explosion-proof box, and the intermediate joint system also comprises a plurality of wireless sensors; the plurality of wireless sensors comprise at least one partial discharge wireless sensor; the partial discharge wireless sensor is arranged in the explosion-proof box. The intermediate joint system can be used for reliably monitoring the partial discharge condition of the intermediate joint for a long time so as to improve the use safety of the intermediate joint.
Description
Technical Field
The invention relates to the field of power monitoring, in particular to an intermediate joint system and a partial discharge monitoring method.
Background
The intermediate head is generally referred to as a cable intermediate joint, i.e., a cable joint at the middle of a cable line. The middle head is used for connecting the middle of cross-linked cables or oil-immersed cables with various voltage grades, and has the main functions of ensuring smooth circuit, keeping the cables sealed, ensuring the insulation grade at the joint of the cables and ensuring the safe and reliable operation of the cables.
The partial discharge phenomenon is an adverse phenomenon mainly aiming at high-voltage electrical equipment, and according to power grid statistics, the partial discharge is an important reason causing the final insulation breakdown of the high-voltage electrical equipment and is also an important sign of insulation degradation.
Specifically, the partial discharge phenomenon refers to the discharge of the insulation of the electrical equipment in a local range under the action of a strong enough electric field, and the discharge is limited to only cause the insulation local short (bridge) connection between conductors without forming a conductive channel. Each time, the local discharge has some influence on an insulating medium, the slight local discharge has small influence on the insulation of the power equipment, and the reduction of the insulation strength is slow; the strong partial discharge causes the insulation strength to be rapidly reduced, which is an important factor for causing insulation damage of high-voltage electric equipment.
Therefore, for high voltage equipment such as a middle head (10kV power system), monitoring is enhanced, and when the partial discharge exceeds a certain level, the equipment should be taken out of operation for maintenance or replacement.
However, in practical implementation, the operation environment of the middle head of the power cable is very severe, the sampling technical requirement is very strict, and the power supply of the monitoring equipment is very inconvenient, so that the monitoring equipment still has a blind area.
Disclosure of Invention
In order to effectively and accurately monitor the intermediate head, the invention provides an intermediate joint system and a partial discharge monitoring method.
Correspondingly, the intermediate joint system provided by the invention comprises an intermediate joint, wherein the intermediate joint comprises an explosion-proof box, and the intermediate joint system also comprises a plurality of wireless sensors;
the plurality of wireless sensors comprise at least one partial discharge wireless sensor;
the partial discharge wireless sensor is arranged in the explosion-proof box.
In an optional embodiment, the plurality of wireless sensors further comprises at least one noise wireless sensor;
the noise wireless sensor is arranged in the explosion-proof box.
In an optional embodiment, a signal sampling interface is arranged on the surface of the explosion-proof box.
In an optional embodiment, the plurality of wireless sensors further include a harmful gas wireless sensor;
the harmful gas wireless sensor is arranged outside the explosion-proof box.
In an alternative embodiment, the intermediate joint system further comprises a pump filter module;
the pump type filtering module comprises an air pump and a plurality of stages of filtering components, and the air pump is sequentially connected with the plurality of stages of filtering components;
any stage of filtering assembly in the plurality of stages of filtering assemblies comprises a filtering box;
two filter boxes of two adjacent groups of filter assemblies are communicated based on filter membranes, and the filter pore diameter of the filter membrane positioned at the relative front stage is larger than that of the filter membrane positioned at the relative rear stage;
the harmful gas wireless sensor is arranged in a filter box of the last stage of filter assembly.
In an alternative embodiment, any of the plurality of stages of filter assemblies further comprises a drain assembly.
In an alternative embodiment, the intermediate joint system further comprises a power supply module.
In an optional embodiment, the intermediate joint system further comprises a monitoring host;
the monitoring host comprises a wireless receiving module and a processing module, and the wireless receiving module is electrically connected with the processing module.
Correspondingly, the embodiment of the invention also provides an intermediate joint monitoring method, which comprises the following steps:
the method comprises the steps that a wireless receiving module is used for synchronously receiving partial discharge monitoring signals from a partial discharge wireless sensor and harmful gas concentration monitoring signals of a harmful gas wireless sensor;
when the partial discharge monitoring signal is judged to be abnormal, confirming the partial discharge of an intermediate interface based on the harmful gas concentration monitoring signal;
and when the harmful gas concentration monitoring signal is abnormal, judging that the intermediate interface has partial discharge.
In an optional implementation manner, while the partial discharge monitoring signal and the harmful gas concentration monitoring signal are synchronously received based on the wireless receiving module, the background noise signal of the noise sensor is synchronously received based on the wireless receiving module, and noise elimination is performed on the partial discharge monitoring signal based on the background noise signal.
In summary, the embodiment of the present invention provides an intermediate connector system and an partial discharge monitoring method, in which a partial discharge sensor is disposed inside an explosion-proof box, so that occurrence of partial discharge can be captured more accurately, and a monitoring situation of partial discharge is more accurate; the harmful gas sensor is arranged outside the explosion-proof box, so that the influence position of the partial discharge high risk in the region where the intermediate joint is located (the risk of the partial discharge to a sealing box outside the explosion-proof box is higher than that of the inner part of the explosion-proof box) can be further monitored, on one hand, the accuracy of an event caused by the partial discharge can be verified based on the change condition of the harmful gas, on the other hand, the harmful gas can be monitored, and the safety accident caused by the partial discharge is avoided; by arranging the noise sensor, the noise sensor is utilized to remove noise from the data of the partial discharge sensor, so that the accuracy of processing the signal of the partial discharge sensor is improved; all sensors are set to be in wired and wireless forms, data can be transmitted to the monitoring host through the two forms, and the reliability of the monitoring data is better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows a schematic structural view of an intermediate joint system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a partial discharge wireless sensor according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a harmful gas wireless sensor according to an embodiment of the invention;
FIG. 4 shows a structural schematic diagram of STM8S 207;
FIG. 5 is a schematic diagram of a monitoring host according to an embodiment of the present invention;
fig. 6 shows a flowchart of an intermediate joint monitoring method according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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 will be understood that 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. 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.
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.
Fig. 1 shows a schematic structural diagram of an intermediate joint system according to an embodiment of the present invention.
The embodiment of the invention provides an intermediate joint system, which comprises an intermediate joint 1, wherein the intermediate joint 1 comprises an explosion-proof box 101, the explosion-proof box 101 is mainly used for protecting adjacent cables from being damaged when the intermediate joint is subjected to breakdown explosion and the like, so that secondary damage is avoided, the explosion-proof box 101 has good internal protection performance, and parts are arranged in the explosion-proof box 101 in the embodiment of the invention, so that the parts are fully protected by utilizing the good protection performance of the explosion-proof box 101. In fig. 1 of the drawings, internal circuits in the explosion-proof box 101 are all shown in a shaded area, and in the specific implementation, the circuit connection condition in the explosion-proof box 101 is designed according to specific conditions.
Specifically, the intermediate joint system further includes a plurality of wireless sensors, specifically, except for the wireless sensors in the prior art, in the specific implementation, wireless modification can be performed for specific sensor types to realize the functions of the wireless sensors. Specifically, wireless sensor generally is assembled by sensor body and wireless transmission module and is formed, and in the concrete implementation, to specific sensor body model and type, choose for use specific wireless transmission module to carry out wireless repacking to realize wireless sensor's function.
Specifically, in the embodiment of the present invention, the plurality of wireless sensors include at least one partial discharge wireless sensor 103; the partial discharge wireless sensor 103 is arranged in the explosion-proof box 101. Specifically, the partial discharge wireless sensor 103 is used for detecting the partial discharge of the line in the intermediate head, and uploading the partial discharge after generating related monitoring signals, specifically, in order to guarantee that effective monitoring can be carried out in all directions, optionally, the number of the partial discharge wireless sensors 103 in one intermediate head is a plurality of, and a plurality of partial discharge wireless sensors 103 are uniformly arranged around the circumference of the line in the explosion-proof box.
Fig. 2 is a schematic structural diagram of a partial discharge wireless sensor according to an embodiment of the present invention. Specifically, the implementation of the partial discharge wireless sensor may be as follows: referring to fig. 2 of the drawings, D1-D2 are clamping protection diodes, L1, L2, C1 and C2 form a band-pass filter, the bandwidth is 50 KHz-100 MHz, radio frequency signals generated by partial discharge are extracted and amplified through an operational amplifier, intermodulation and stray signals generated by the operational amplifier are filtered out by L3 and C3, and the amplified effective partial discharge radio frequency signals are transmitted to a radio frequency detection circuit of a monitoring host based on a corresponding wireless transmission module.
Further, due to the complex circuit inside the middle connector, the magnetic field and the electric field inside the middle connector are very irregular, and it is very easy to affect the signal (analog signal) and the signal generation of the local wireless sensor 103, therefore, in order to increase the identification accuracy of the signal, the plurality of wireless sensors of the embodiment of the present invention further include at least one noise wireless sensor 102; the noisy wireless sensor 102 is disposed within the explosion proof box. Specifically, the noise wireless sensor 102 is mainly used for collecting an interference signal near the partial discharge wireless sensor 103 for reference of the monitoring host, and performing denoising processing on the signal of the partial discharge wireless sensor 103, so as to accurately identify the signal of the partial discharge wireless sensor 103. Further, the noise wireless sensor 102 and the corresponding partial discharge wireless sensor 103 should be disposed as close as possible to ensure that the interference signal is as close as possible.
Further, a signal sampling interface 105 is arranged on the surface of the explosion-proof box. Specifically, due to the instability of wireless connection, for specific implementation conditions, such as operations of maintenance, detection, calibration and the like, wired connection is needed for parts inside the explosion-proof box which is convenient; in order to ensure the sealing performance of the explosion-proof box, in the embodiment of the invention, the signal sampling interface 105 is arranged on the surface of the explosion-proof box, and the signal sampling interface 105 is electrically connected with parts (such as the noise wireless sensor 102 and the partial discharge wireless sensor 103) located inside the explosion-proof box. Meanwhile, the wired connection is used as a second connection mode of parts in the explosion-proof box and external equipment, in specific implementation, the wired connection and the wireless connection can be implemented simultaneously, and when one of the parts is disconnected, the other connection mode can be used, so that the stability of data transmission is ensured; in addition, the existence of the two connection modes can further improve the data transmission reliability.
Further, since the partial discharge may generate ionization and the like on the ambient gas, in order to further confirm the partial discharge phenomenon, optionally, the plurality of wireless sensors further include a harmful gas wireless sensor 205; the harmful gas wireless sensor 205 is disposed outside the explosion-proof case. When the partial discharge takes place, partial harmful gas can be produced to reveal outside explosion-proof box (the partial discharge potential safety hazard that takes place outside explosion-proof box is bigger), consequently, can be fine monitor harmful gas through harmful gas wireless sensor 205.
Specifically, the harmful gas wireless sensor 205 according to the embodiment of the present invention is substantially a series of monitoring sensors for specific gases, such as CH4、H2S、CO、O2And waiting for gas monitoring.
Fig. 3 shows a schematic structural diagram of the harmful gas wireless sensor 205 according to the embodiment of the invention. Specifically, the implementation of the harmful gas wireless sensor may be as follows: referring to FIG. 3 of the drawings, the gas sensor ICS requires dual power supplies, and when the power supply is interrupted, Q1 will short-circuit the W-E (working electrode) and R-E (reference electrode) of the ICS for protection; the stability of the circuit depends on R1, R2, C2, C3; IC 1-IC 2 select OP 296; the monitoring data of the gas content is transmitted to a radio frequency detection circuit of the monitoring host based on the corresponding wireless transmission module.
Further, in order to improve the service life and the monitoring accuracy of the harmful gas wireless sensor 205, optionally, the intermediate joint system further includes a pump type filtering module;
the pump type filtering module comprises an air pump 204 and a plurality of stages of filtering components, and the air pump 204 is sequentially connected with the plurality of stages of filtering components;
any stage of the plurality of stages of filter assemblies comprises a filter cassette 201;
the two filter boxes 201 of the two adjacent groups of filter assemblies are communicated based on the filter membrane 206, and the filter pore diameter of the filter membrane positioned at the relative front stage is larger than that of the filter membrane positioned at the relative rear stage; the harmful gas wireless sensor 205 is disposed in the filter cartridge 201 of the last stage filter assembly.
Specifically, the filter cartridges 201 of the embodiment of the present invention are fixed and connected by a connecting member 203, a corresponding gas flow channel is formed inside the connecting member 203, and the filter membrane is disposed in the corresponding gas flow channel to filter the gas in the flowing process; specifically, the embodiment of the invention adopts a three-stage filtration implementation mode; the aperture of the filtering hole of the primary filtering membrane is 1um, so that water and dust can be effectively filtered; the aperture of the filtering hole of the second-stage filtering membrane is 0.1um, so that the water can be finely filtered; the third-stage filtering membrane is a filtering membrane with a dust metallurgy type; gas passes through tertiary filtration system, can avoid water and dust to cause the damage to sensor inside effectively, can avoid the influence of humidity to the sampling in the tube well simultaneously.
Further, any stage of the filtering assemblies in the plurality of stages further comprises a water drainage assembly 202, the water drainage assembly 202 can be an electric control valve, and when needed, the air pump 204 backflushs air by opening the electric control valve to flush out the stored water of the filtering box 201. In the last stage of the filter cassette 201, water accumulation does not occur due to complete filtration of water molecules.
Further, the intermediate joint system further comprises a power supply module 3, and the power supply module 3 is used for supplying power to each power utilization part (the power supply wiring condition is not completely shown in the figure). Specifically, the power supply module 3 may be a solar module disposed on the ground surface.
Further, the intermediate joint system further comprises a monitoring host 4; the monitoring host 4 comprises a wireless receiving module and a processing module, and the wireless receiving module is electrically connected with the processing module. Specifically, the monitoring host 4 is mainly used for receiving and processing signals of the partial discharge wireless sensor, the noise wireless sensor and the harmful gas wireless sensor. Specifically, the operation of the monitoring host 4 will be described later.
Specifically, the monitoring host according to the embodiment of the present invention may be manufactured based on an STM8S207 microprocessor.
Fig. 4 shows a structural schematic diagram of the STM8S207, and fig. 5 shows a structural schematic diagram of the monitoring host according to the embodiment of the present invention. Specifically, for the case of insufficient ports, the alternate reading of information may be performed in a port multiplexing manner or a manner of taking one clock frequency as an interval, and specifically, the present invention may be performed with reference to the prior art, and the description thereof is not extended.
Fig. 6 shows a flowchart of an intermediate joint monitoring method according to an embodiment of the present invention, and accordingly, the present invention provides an intermediate joint monitoring method, including:
s101: the method comprises the steps that a wireless receiving module is used for synchronously receiving partial discharge monitoring signals from a partial discharge wireless sensor and harmful gas concentration monitoring signals of a harmful gas wireless sensor;
specifically, the monitoring host 4 receives the partial discharge monitoring signal from the partial discharge wireless sensor and the harmful gas concentration monitoring signal from the harmful gas wireless sensor based on the wireless receiving module, optionally receives the background noise signal from the noise sensor based on the wireless receiving module while receiving the partial discharge monitoring signal and the harmful gas concentration monitoring signal based on the wireless receiving module, and performs noise elimination on the partial discharge monitoring signal based on the background noise signal.
S102: when the partial discharge monitoring signal is judged to be abnormal, confirming the partial discharge of an intermediate interface based on the harmful gas concentration monitoring signal;
due to instability (serious interference) of the partial discharge monitoring signal, in order to improve the identification accuracy, the partial discharge of the intermediate interface needs to be confirmed based on the harmful gas concentration monitoring signal;
s103: and when the harmful gas concentration monitoring signal is abnormal, judging that the intermediate interface has partial discharge.
And when the monitoring signal of the concentration of the harmful gas is judged to be abnormal, judging that the intermediate interface has partial discharge, and carrying out corresponding early warning.
Specifically, the partial discharge monitoring method provided by the embodiment of the invention corresponds to the existing infrared imaging technology, and has the following advantages:
monitoring the object: the infrared imaging technology generates a heating phenomenon after being locally developed to a certain degree and is sensed by the infrared imaging equipment; the partial discharge monitoring method of the embodiment of the invention can monitor the partial discharge when the scattered partial discharge is generated;
environmental impact: the infrared imaging equipment is easily influenced by the severe environment inside the tube well, such as lens shielding, humidity influence on an internal precise optical lens and the like; the partial discharge monitoring method is not easily influenced by a pipe well, and can eliminate the influence of environmental noise by simultaneously collecting through a plurality of sensors, complementarily offsetting paths and combining a noise sensor;
the integration difficulty of the sensor: the infrared imaging equipment is not easy to integrate into an explosion-proof box; the wireless sensor is easy to integrate into an explosion-proof box;
monitoring effect: for the infrared imaging technology, the partial discharge close to the ground is difficult to scan due to the influence of shielding (scanning from the ground upwards is impossible) on infrared installation, and the infrared scanning middle head has poor effect due to shielding of an explosion-proof box and darkness inside a pipe well; the wireless sensor of the partial discharge monitoring method of the embodiment of the invention is integrated in the explosion-proof box, so that the partial discharge of the middle head can be monitored in an all-around manner;
transmission data volume: for the infrared imaging technology, the data volume of the infrared image is large, and the data is transmitted in a wireless mode to realize remote monitoring, so that manual judgment is needed, and the remote monitoring is not necessarily accurate; the partial discharge monitoring method of the embodiment of the invention has small data volume in a wireless sensing mode, can autonomously carry out partial discharge judgment on site, and automatically reports an alarm if necessary without human intervention;
equipment installation: for the infrared imaging technology, the infrared imaging equipment needs to have a certain distance from the middle head, and is particularly difficult to install in a pipe well; the device of the partial discharge monitoring method provided by the embodiment of the invention is integrated in the explosion-proof box, so that the installation problem does not exist.
Furthermore, the monitoring host is in contact with the background server in a wireless mode, and a user can be in contact with the server through a client (a PC and a mobile terminal) to monitor the field condition in real time. When partial discharge occurs, the integrated monitoring host reports an alarm to the server in time and pushes alarm information to the client.
In summary, the embodiment of the present invention provides an intermediate connector system and an partial discharge monitoring method, in which a partial discharge sensor is disposed inside an explosion-proof box, so that occurrence of partial discharge can be captured more accurately, and a monitoring situation of partial discharge is more accurate; the harmful gas sensor is arranged outside the explosion-proof box, so that the influence position of the partial discharge high risk in the region where the intermediate joint is located (the risk of the partial discharge to a sealing box outside the explosion-proof box is higher than that of the inner part of the explosion-proof box) can be further monitored, on one hand, the accuracy of an event caused by the partial discharge can be verified based on the change condition of the harmful gas, on the other hand, the harmful gas can be monitored, and the safety accident caused by the partial discharge is avoided; by arranging the noise sensor, the noise sensor is utilized to remove noise from the data of the partial discharge sensor, so that the accuracy of processing the signal of the partial discharge sensor is improved; all sensors are set to be in wired and wireless forms, data can be transmitted to the monitoring host through the two forms, and the reliability of the monitoring data is better.
The intermediate joint system and the partial discharge monitoring method provided by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An intermediate joint system, comprising an intermediate joint, wherein the intermediate joint comprises an explosion-proof box, and is characterized in that the intermediate joint system further comprises a plurality of wireless sensors;
the plurality of wireless sensors comprise at least one partial discharge wireless sensor;
the partial discharge wireless sensor is arranged in the explosion-proof box.
2. The intermediate joint system of claim 1, wherein the plurality of wireless sensors further comprises at least one noisy wireless sensor;
the noise wireless sensor is arranged in the explosion-proof box.
3. The intermediate head system of claim 1, wherein the explosion-proof cassette surface is provided with a signal sampling interface.
4. The intermediate joint system of claim 1, wherein the plurality of wireless sensors further comprises a hazardous gas wireless sensor;
the harmful gas wireless sensor is arranged outside the explosion-proof box.
5. The intermediate joint system of claim 4, further comprising a pump filter module;
the pump type filtering module comprises an air pump and a plurality of stages of filtering components, and the air pump is sequentially connected with the plurality of stages of filtering components;
any stage of filtering assembly in the plurality of stages of filtering assemblies comprises a filtering box;
two filter boxes of two adjacent groups of filter assemblies are communicated based on filter membranes, and the filter pore diameter of the filter membrane positioned at the relative front stage is larger than that of the filter membrane positioned at the relative rear stage;
the harmful gas wireless sensor is arranged in a filter box of the last stage of filter assembly.
6. The intermediate joint system of claim 5, wherein any of the plurality of stages of filter assemblies further comprises a drain assembly.
7. The intermediate joint system according to claims 1 to 6, wherein the intermediate joint system further comprises a power supply module.
8. The intermediate joint system according to claims 1 to 6, further comprising a monitoring host;
the monitoring host comprises a wireless receiving module and a processing module, and the wireless receiving module is electrically connected with the processing module.
9. An intermediate joint monitoring method, comprising:
the method comprises the steps that a wireless receiving module is used for synchronously receiving partial discharge monitoring signals from a partial discharge wireless sensor and harmful gas concentration monitoring signals of a harmful gas wireless sensor;
when the partial discharge monitoring signal is judged to be abnormal, confirming the partial discharge of an intermediate interface based on the harmful gas concentration monitoring signal;
and when the harmful gas concentration monitoring signal is abnormal, judging that the intermediate interface has partial discharge.
10. The intermediate joint monitoring method according to claim 9, wherein the background noise signal of the noise sensor is synchronously received based on the wireless receiving module while the partial discharge monitoring signal and the harmful gas concentration monitoring signal are synchronously received based on the wireless receiving module, and the partial discharge monitoring signal is subjected to noise cancellation based on the background noise signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011217139.3A CN112415342A (en) | 2020-11-04 | 2020-11-04 | Intermediate joint system and partial discharge monitoring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117949792A (en) * | 2024-03-22 | 2024-04-30 | 山西辉能科技有限公司 | Switch cabinet partial discharge monitoring device |
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Application publication date: 20210226 |