CN113985232A - Urban switch cabinet local discharge fault on-line detection system for urban power supply bureau - Google Patents
Urban switch cabinet local discharge fault on-line detection system for urban power supply bureau Download PDFInfo
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- CN113985232A CN113985232A CN202111311206.2A CN202111311206A CN113985232A CN 113985232 A CN113985232 A CN 113985232A CN 202111311206 A CN202111311206 A CN 202111311206A CN 113985232 A CN113985232 A CN 113985232A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- 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
- G01R31/1218—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 using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- 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
- G01R31/1227—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 of components, parts or materials
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Abstract
A local discharge fault on-line detection system of an urban switch cabinet for a municipal power supply office is characterized in that gas sensors are respectively arranged inside and outside the switch cabinet and used for acquiring the contents of ozone and nitrogen oxides in the environment; two infrared sensors for sensing light and heat in the switch cabinet are further mounted in the switch cabinet, wherein one infrared sensor faces to the electric elements in the cabinet, and the other infrared sensor faces away from the electric elements; the control system is used for digitizing the electric signals input by the gas sensor and the infrared sensor and comparing the digital signals; when the numerical value of the gas sensor in the switch cabinet is larger than that of the gas sensor outside the switch cabinet, and/or the numerical value of the infrared sensor facing to the electric element in the cabinet is larger than that of the infrared sensor facing away from the electric element, the control system gives a remote alarm. According to the invention, the influence of environmental factors on the sensor is eliminated through a comparison method, and the reliability and accuracy of detection are improved.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to an urban switch cabinet partial discharge fault online detection system for a city power supply office.
Background
In urban power supply faults, the fault occupation ratio caused by the discharge of the switch cabinet is high, and the power supply quality and reliability are seriously influenced. The main reason is that the switch cabinet can form partial discharge due to factors such as insulation moisture, aging and surface dirt in the operation process, so that the light causes the fault loss of the electric elements in the switch cabinet, the heavy causes the breakdown of the whole power grid, and huge economic loss is brought to the society. Therefore, the detection and the discovery of the partial discharge defect of the switch cabinet in time are the premise of realizing the predictive maintenance, and have great significance for guaranteeing the safe operation of the electric power.
Currently, commonly used methods for detecting partial discharge faults of switch cabinets are a transient earth potential method and an ultrasonic wave method. The ultrasonic method uses piezoelectric crystal as acoustoelectric conversion element, when the switch cabinet is discharged, the sound wave signal generated by partial discharge is transmitted to the surface of the switch cabinet, then the ultrasonic sensor converts the ultrasonic signal into electric signal, and the electric signal is further amplified and transmitted to the acquisition system, so as to achieve the purpose of detecting the partial discharge. The ultrasonic method has the defects that the ultrasonic sensor is arranged outside the switch cabinet and is influenced by interference signals such as noise signals or vibration signals in an urban area, and errors are brought to the measurement of the ultrasonic sensor.
The transient ground potential method needs to tightly fix the transient ground potential sensor on the AIS switch cabinet or the GIS switch cabinet equipment, a transient ground potential signal can be input into the signal conditioning module through a shielded wire, and the transient ground potential signal is processed by the signal conditioning module and then transmitted to the control host for display. The ultrasonic method has the disadvantages that the transient ground potential signal is usually acquired by adopting a capacitive coupling mode, and the acquired transient ground potential signal is very short and weak and is easy to be interfered by the urban environment to bring measurement errors.
From the above, the actual effects of the two detection methods are not ideal in urban areas with complex environments, so that a partial discharge fault detection system capable of adapting to urban environments is needed.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses an urban switch cabinet local discharge fault on-line detection system for a city power supply office, which aims to: the method is suitable for complex environments in urban areas, is not interfered by the environment, and improves the effectiveness and reliability of partial discharge fault detection.
In order to achieve the purpose, the invention adopts the following technical scheme:
a local discharge fault on-line detection system of an urban switch cabinet for a municipal power supply office is characterized in that gas sensors are respectively arranged inside and outside the switch cabinet and are used for acquiring the content of ozone and/or nitrogen oxide in the environment; two infrared sensors for sensing light and heat in the switch cabinet are further mounted in the switch cabinet, wherein one infrared sensor faces to the electric elements in the cabinet, and the other infrared sensor faces away from the electric elements;
the gas sensor and the infrared sensor are connected with a control system, and the control system is used for digitizing electric signals input by the gas sensor and the infrared sensor and comparing the digital signals; when the numerical value of the gas sensor in the switch cabinet is larger than that of the gas sensor outside the switch cabinet, and/or the numerical value of the infrared sensor facing to the electric element in the cabinet is larger than that of the infrared sensor facing away from the electric element, the control system gives a remote alarm.
Further improve technical scheme, when the numerical value of the gas sensor in the cubical switchboard is more than 1.1 times of the numerical value of the gas sensor outside the cubical switchboard, and the numerical value of the infrared sensor towards the electric element in the cubical switchboard is more than 1.1 times of the numerical value of the infrared sensor back to the electric element, the control system gives a remote alarm.
Further improve technical scheme, when the numerical value of the gas sensor in the cubical switchboard is more than 1.2 times of the numerical value of the gas sensor outside the cubical switchboard, or the numerical value of the infrared sensor facing to the electric element in the cubical switchboard is more than 1.2 times of the numerical value of the infrared sensor backing to the electric element, the control system gives a remote alarm.
The technical scheme is further improved, and the control system comprises an analog signal processing module, an analog-to-digital conversion module, a microprocessor and a remote communication module, wherein the remote communication module is used for transmitting the alarm signal to a remote control end.
According to the technical scheme, the infrared camera facing to the electric elements in the switch cabinet is further installed in the switch cabinet, and image signals shot by the infrared camera are transmitted to the remote control end through the remote communication module.
After the technical scheme is adopted, compared with the background technology, the invention has the following beneficial effects:
according to the invention, the gas sensors are respectively arranged inside and outside the urban switch cabinet, and the influence of environmental gas on the detection of discharge associated gas is eliminated by a comparison method; still install two infrared ray sensors that are used for perception cabinet light and heat in the inside at the cubical switchboard, rejected the influence that ambient temperature and illuminance brought the light and heat detection of discharge companion through the comparison method, improved reliability and the accuracy of detection.
In addition, the invention can combine the two measurement methods during detection to improve the reliability of measurement.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a flow chart of the present invention.
In the figure: 1. a switch cabinet; 2. an electrical component; 3. an in-cabinet gas sensor; 4. an outside cabinet gas sensor; 5. a first infrared sensor; 6. a second infrared sensor; 7. an infrared camera.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
An online detection system for local discharge faults of a city district switch cabinet for a city power supply office is shown in figure 1 and comprises an in-cabinet gas sensor 3 arranged inside the switch cabinet 1 and an out-cabinet gas sensor 4 arranged outside the switch cabinet 1, wherein the in-cabinet gas sensor 3 and the out-cabinet gas sensor 4 are both composed of an ozone gas sensor and a nitric oxide sensor, the ozone gas sensor is used for acquiring ozone in the environment, and the nitric oxide sensor is used for acquiring the content of nitric oxide in the environment. Two infrared sensors for sensing light and heat in the switch cabinet 1 are further mounted in the switch cabinet, wherein the infrared sensor facing the electric element 2 in the cabinet is the second infrared sensor 6, and the infrared sensor facing away from the electric element 2 is the first infrared sensor 5.
The partial discharge is accompanied by physical phenomena such as electromagnetic waves, sound waves, gas products, light, heat, and current traveling waves. In which, the electromagnetic wave, the acoustic wave and the current traveling wave are greatly interfered by the external environment, and it is difficult to extract effective information. Because the switch cabinet 1 can not be completely sealed, and gas products, light and heat in the cabinet can also change along with the change of the external environment, the occurrence of partial discharge faults can not be accurately reflected by independently arranging the corresponding sensors in the switch cabinet 1.
The gas products associated with partial discharge are mainly ozone and nitrogen oxides, and in the present invention, the gas sensors include an ozone gas sensor and a nitrogen oxide sensor, which is a redundant design. Automobile exhaust in cities also contains nitrogen oxides, and ozone can be generated in areas with strong ultraviolet rays, but the condition that ozone and nitrogen oxides are generated simultaneously is few, so that misjudgment can be reduced. In the present embodiment, the ozone gas sensor and the nitrogen oxide sensor arranged outside the switch cabinet 1 can acquire the ozone content and the nitrogen oxide content in the external environment, and the ozone gas sensor and the nitrogen oxide sensor arranged inside the switch cabinet 1 can acquire the ozone content and the nitrogen oxide content in the air inside the switch cabinet 1. When partial discharge occurs, the ozone content and the nitrogen oxide content in the air in the switch cabinet 1 are inevitably increased, and the partial discharge fault can be accurately reflected through comparison.
Similarly, the first infrared sensor 5 facing away from the electrical component 2 is used to sense light and heat of the environment inside the switch cabinet 1, and eliminate the influence of the external light and heat on the second infrared sensor 6 facing the electrical component 2 inside the cabinet. Light and heat generated by partial discharge in the switch cabinet 1 are also a redundant design to be utilized by the invention, and when the light signal and the heat signal output by the second infrared sensor 6 are synchronously and obviously increased and the light signal and the heat signal output by the first infrared sensor 5 are not obviously changed, whether the partial discharge phenomenon occurs or not can be reflected by comparing the difference value of the output signals of the two sensors. Therefore, no matter how the outside temperature and the illuminance change, the comparative measurement of the infrared sensor is not influenced.
The gas sensor and the infrared sensor are connected with a control system, and the control system is used for digitizing electric signals input by the gas sensor and the infrared sensor and comparing the digital signals. Specifically, as shown in fig. 2, the control system includes an analog signal processing module, an analog-to-digital conversion module, a microprocessor, and a remote communication module, wherein the analog signal processing module is connected to the gas sensor and the infrared sensor, and is configured to simulate an electrical signal input by the gas sensor and the infrared sensor into a voltage signal; the analog-to-digital conversion module is used for digitizing the voltage signal; the microprocessor is used for comparing the digital signals and judging whether a partial discharge fault occurs or not through logic; if yes, the remote communication module transmits the alarm signal to the remote control end.
The invention can set various alarm conditions, one is when the value of the gas sensor 3 in the cabinet is larger than the value of the gas sensor 4 outside the cabinet, or the value of the second infrared sensor 6 is larger than the value of the first infrared sensor 5, the control system gives an alarm remotely. The insurance factor is highest in this case, but the probability of false alarm is also highest. And the other is that when the value of the gas sensor 3 in the cabinet is greater than the value of the gas sensor 4 outside the cabinet, and simultaneously, the value of the second infrared sensor 6 is greater than the value of the first infrared sensor 5, the control system gives a remote alarm. The insurance factor for this case is lowest, but the probability of false alarms is also lowest.
In order to take reliability and accuracy into consideration, the following two strategies can be preferably adopted, namely when the numerical value of the gas sensor 3 in the cabinet is more than 1.1 times of the numerical value of the gas sensor 4 outside the cabinet, and the numerical value of the second infrared sensor 6 is more than 1.1 times of the numerical value of the first infrared sensor 5, the control system gives an alarm remotely. And the other type is that when the numerical value of the gas sensor 3 in the cabinet is more than 1.2 times of the numerical value of the gas sensor 4 outside the cabinet, or the numerical value of the second infrared sensor 6 is more than 1.2 times of the numerical value of the first infrared sensor 5, the control system gives a remote alarm.
In order to further confirm the alarm information, an infrared camera 7 facing the electric elements 2 in the switch cabinet 1 is further installed in the switch cabinet, the infrared camera 7 can adapt to the dark environment in the cabinet, and image signals shot by the infrared camera 7 are transmitted to a remote control end by a remote communication module. When receiving alarm information, the remote personnel observe the inside of the alarm switch cabinet 1 through the infrared camera 7, and confirm whether the situation of misinformation occurs.
The details of which are not described in the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A local discharge fault on-line detection system of urban switch cabinets for urban power supply bureaus is characterized in that: gas sensors are respectively arranged inside and outside the switch cabinet and are used for acquiring the content of ozone and/or nitrogen oxide in the environment; two infrared sensors for sensing light and heat in the switch cabinet are further mounted in the switch cabinet, wherein one infrared sensor faces to the electric elements in the cabinet, and the other infrared sensor faces away from the electric elements;
the gas sensor and the infrared sensor are connected with a control system, and the control system is used for digitizing electric signals input by the gas sensor and the infrared sensor and comparing the digital signals; when the numerical value of the gas sensor in the switch cabinet is larger than that of the gas sensor outside the switch cabinet, and/or the numerical value of the infrared sensor facing to the electric element in the cabinet is larger than that of the infrared sensor facing away from the electric element, the control system gives a remote alarm.
2. The system for on-line detection of local discharge fault of urban switch cabinet for urban power supply bureau according to claim 1, wherein: when the numerical value of the gas sensor in the switch cabinet is more than 1.1 times of the numerical value of the gas sensor outside the switch cabinet, and the numerical value of the infrared sensor facing to the electric element in the cabinet is more than 1.1 times of the numerical value of the infrared sensor facing away from the electric element, the control system gives a remote alarm.
3. The system for on-line detection of local discharge fault of urban switch cabinet for urban power supply bureau according to claim 1, wherein: when the numerical value of the gas sensor in the switch cabinet is more than 1.2 times of the numerical value of the gas sensor outside the switch cabinet, or the numerical value of the infrared sensor facing to the electric element in the cabinet is more than 1.2 times of the numerical value of the infrared sensor facing away from the electric element, the control system gives a remote alarm.
4. The method for detecting the local discharge fault of the urban switch cabinet used in the urban power supply office as claimed in claim 1, wherein the method comprises the following steps: the control system comprises an analog signal processing module, an analog-to-digital conversion module, a microprocessor and a remote communication module, wherein the remote communication module is used for transmitting an alarm signal to a remote control end.
5. The system for on-line detection of local discharge fault of urban switch cabinet for urban power supply bureau according to claim 4, wherein: an infrared camera facing to the electric elements in the switch cabinet is further installed in the switch cabinet, and image signals shot by the infrared camera are transmitted to the remote control end through the remote communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111311206.2A CN113985232A (en) | 2021-11-08 | 2021-11-08 | Urban switch cabinet local discharge fault on-line detection system for urban power supply bureau |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111311206.2A CN113985232A (en) | 2021-11-08 | 2021-11-08 | Urban switch cabinet local discharge fault on-line detection system for urban power supply bureau |
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