CN113253064B - Cable partial discharge detection method and device - Google Patents
Cable partial discharge detection method and device Download PDFInfo
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- CN113253064B CN113253064B CN202110388640.4A CN202110388640A CN113253064B CN 113253064 B CN113253064 B CN 113253064B CN 202110388640 A CN202110388640 A CN 202110388640A CN 113253064 B CN113253064 B CN 113253064B
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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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The application relates to a cable partial discharge detection method, a device, computer equipment and a storage medium. The method comprises the following steps: acquiring the grounding end current of the metal sheath and the surface temperature of the metal sheath; judging whether the cable is subjected to partial discharge or not according to the state of the grounding end current when the state of the surface temperature of the metal sheath is an abnormal state; wherein the state of the ground current includes an abnormal state or a normal state; and if the cable is subjected to partial discharge, determining the occurrence position or the discharge stage of the partial discharge of the cable according to the input current of the cable. The method can improve the flexibility and accuracy of detection, and is convenient for workers to adopt corresponding remedial measures after the occurrence position/discharge stage of partial discharge is defined, so that the emergency loss caused by the partial discharge of the cable is reduced, and the potential safety hazard caused by the partial discharge of the cable is eliminated.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a method and a device for detecting partial discharge of a cable.
Background
In the use process of the cable, local electric field concentration is caused by the non-uniformity of electric field distribution or defects or impurities in the insulating material wrapping the wire core, and the insulating material breaks down or discharges along the surface of the insulating material at the place where the electric field is concentrated. Such discharges are present only in localized locations of the insulating material and do not immediately form a breakdown or flashover of the overall dielectric integrity, known as partial discharges.
The defect area of the partial discharge in early stage is smaller, and the whole insulation capability of the insulation material outside the cable is not reduced, but the defect area is gradually enlarged along with the continuous damage of the partial discharge to the defect area, the insulation capability of the insulation material is gradually reduced, the service life is shortened, and serious accidents such as insulation failure and the like can be caused in a short time. Therefore, the detection and the state judgment of the partial discharge are of great significance for maintaining the operation safety of the power system.
In the traditional technology, the detection method of the partial discharge of the cable adopts the phase information and the amplitude information of different positions on the cable to determine whether the partial discharge exists, and the detection accuracy is low and the effect is poor.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, apparatus, computer device, and storage medium for detecting partial discharge of a cable.
The method for detecting partial discharge of the cable, the cable is wrapped by a metal sheath, the metal sheath is used for grounding, the method comprises the following steps:
acquiring the current of a grounding end of the metal sheath and the surface temperature of the metal sheath;
when the state of the surface temperature of the metal sheath is an abnormal state, judging whether partial discharge occurs to the cable according to the state of the current of the grounding end; wherein, the state of the ground terminal current comprises an abnormal state or a normal state;
if the cable is subjected to partial discharge, determining the occurrence position or the discharge stage of the partial discharge of the cable according to the input current of the cable.
In one embodiment, when the state of the surface temperature of the metal sheath is an abnormal state, determining whether the partial discharge occurs in the cable according to the state of the ground current includes:
if the state of the current of the grounding end is a normal state, determining the abnormal type of the surface temperature of the metal sheath, and judging whether partial discharge occurs to the cable according to the abnormal type.
In one embodiment, determining the type of anomaly in the surface temperature of the metal sheath includes:
Acquiring the temperature of a preset interval position of the metal sheath;
calculating a temperature difference between temperatures at adjacent preset interval positions;
if the temperature difference is larger than the temperature difference threshold value, determining that the abnormal type of the surface temperature of the metal sheath is local temperature abnormality;
if the temperature difference is not greater than the temperature difference threshold, determining that the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality.
In one embodiment, determining whether partial discharge occurs in the cable according to the type of anomaly includes:
and if the abnormal type of the surface temperature of the metal sheath is the local temperature abnormality, determining that the cable is subjected to local discharge.
In one embodiment, determining a discharge phase of a partial discharge of the cable from an input current of the cable comprises:
if the surface temperature of the metal sheath is increased and the input current of the cable is increased, determining a discharge stage of partial discharge of the cable as a development stage; wherein, the severity of the partial discharge of the cable used for representing the development stage becomes serious with the increase of the input current;
if the surface temperature of the metal sheath is increased and the input current of the cable is in a stable state, determining that the discharge stage of partial discharge of the cable is a pre-breakdown stage; wherein the pre-breakdown stage is used to characterize the cable near breakdown.
In one embodiment, the method further comprises:
and determining the occurrence position of partial discharge according to the position of the surface temperature in the abnormal state on the metal sheath.
In one embodiment, when the state of the surface temperature of the metal sheath is an abnormal state, determining whether the partial discharge occurs in the cable according to the state of the ground current includes:
if the state of the current of the grounding end is an abnormal state, acquiring the discharge information of the preset position of the cable, and judging whether the discharge information of the preset position meets the partial discharge characteristic; the discharge information comprises discharge voltage, discharge phase and discharge frequency;
and if the discharge information of the preset position meets the partial discharge characteristic, determining that the cable is subjected to partial discharge.
In one embodiment, the cable further comprises a metal clamp for fixing the metal sheath, and determining the occurrence position of partial discharge of the cable according to the input current of the cable comprises:
if the ground current increases and the input current of the cable also increases, or if the ground current decreases and the input current of the cable assumes a steady state, it is determined that a partial discharge occurs between the metal sheath and the metal clamp.
In one embodiment, the cable further comprises a metal clamp for securing the metal sheath, and the method further comprises:
If the cable is subjected to partial discharge, acquiring the type of the partial discharge of the cable;
if the partial discharge type of the cable is non-main insulation partial discharge, determining that partial discharge occurs between the metal sheath and the metal clamp.
A device for detecting partial discharge of a cable, the cable being surrounded by a metal sheath for grounding, said device comprising:
the parameter acquisition module is used for acquiring the grounding end current of the metal sheath and the surface temperature of the metal sheath;
the discharging judgment module is used for judging whether the cable is subjected to partial discharging or not according to the state of the current of the grounding end under the condition that the state of the surface temperature of the metal sheath is an abnormal state; wherein, the state of the ground terminal current comprises an abnormal state or a normal state;
and the discharge positioning module is used for determining the occurrence position or the discharge stage of the partial discharge of the cable according to the input current of the cable under the condition that the partial discharge of the cable occurs.
A computer device comprising a memory storing a computer program and a processor which when executing the computer program performs the steps of:
acquiring the current of a grounding end of the metal sheath and the surface temperature of the metal sheath;
When the state of the surface temperature of the metal sheath is an abnormal state, judging whether partial discharge occurs to the cable according to the state of the current of the grounding end; wherein, the state of the ground terminal current comprises an abnormal state or a normal state;
if the cable is subjected to partial discharge, determining the occurrence position or the discharge stage of the partial discharge of the cable according to the input current of the cable.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
acquiring the current of a grounding end of the metal sheath and the surface temperature of the metal sheath;
when the state of the surface temperature of the metal sheath is an abnormal state, judging whether partial discharge occurs to the cable according to the state of the current of the grounding end; wherein, the state of the ground terminal current comprises an abnormal state or a normal state;
if the cable is subjected to partial discharge, determining the occurrence position or the discharge stage of the partial discharge of the cable according to the input current of the cable.
According to the detection method, the device, the computer equipment and the storage medium for the partial discharge of the cable, the grounding end current of the metal sheath and the surface temperature of the metal sheath are obtained, when the surface temperature of the metal sheath is determined to be in an abnormal state, whether the cable is subjected to partial discharge or not is further judged according to the state of the grounding end current, and then under the condition that the partial discharge of the cable is determined, the occurrence position or the discharge stage of the partial discharge of the cable is determined according to the input current of the cable, the grounding end current and the surface temperature of the metal sheath wrapping the cable can reflect the working state of the cable, the grounding end current and the surface temperature of the metal sheath are integrated to accurately judge whether the partial discharge of the cable occurs, the occurrence position or the discharge stage of the cable is further determined according to the input current of the cable, compared with the fact that the detection flexibility is improved according to the discharge information, the judgment result is more accurate, and after the occurrence position/discharge stage of the partial discharge is determined, workers can conveniently adopt corresponding remedial measures to reduce emergency loss caused by the partial discharge of the cable, and potential safety hazards caused by the partial discharge of the cable are eliminated.
Drawings
FIG. 1 is a schematic diagram of a cable in one embodiment;
FIG. 2 is a flow chart of a method for detecting partial discharge of a cable according to an embodiment;
FIG. 3 is a flow chart of determining the type of anomaly in the surface temperature of a metal sheath in one embodiment;
FIG. 4 is a flow chart illustrating a method for determining the state of the ground current and the surface temperature of a metal sheath according to one embodiment;
FIG. 5 is a flow chart illustrating a discharge phase of partial discharge determination in one embodiment;
FIG. 6 is a flow diagram of determining whether partial discharge of a cable has occurred in one embodiment;
FIG. 7 is a flow chart of determining a location of occurrence of partial discharge in one embodiment;
FIG. 8 is a block diagram of a cable partial discharge detection device in one embodiment;
fig. 9 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In one embodiment, a method for detecting partial discharge of a cable is provided, wherein the cable formed by insulating materials including electric cores is wrapped by a grounded metal sheath, as shown in fig. 1, and the method can be applied to a terminal. It is understood that the terminal may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices. In this embodiment, an example of application of the method to a computer device is described, as shown in fig. 2, including the following steps:
S210, acquiring the grounding end current of the metal sheath and the surface temperature of the metal sheath.
The grounding end current is the grounding current of the metal sheath grounding end.
Optionally, the computer device obtains the current of the grounding end of the metal sheath through the current sensor, and obtains the surface temperature of the metal sheath through the temperature sensor, so that the temperature of any position point on the metal sheath can be obtained as the surface temperature of the metal sheath, and the average value of the temperatures of a plurality of position points on the metal sheath can be obtained as the surface temperature of the metal sheath.
S220, when the state of the surface temperature of the metal sheath is abnormal, judging whether partial discharge occurs to the cable according to the state of the grounding end current.
The state of the ground terminal current includes an abnormal state or a normal state, and the abnormal state of the contact terminal current includes an abnormal rise or an abnormal fall of the ground terminal current. Similarly, the state of the surface temperature of the metal sheath also includes an abnormal state or a normal state, and the abnormal state of the surface temperature includes an abnormal increase in the surface temperature or an abnormal decrease in the surface temperature.
Alternatively, the computer device may determine the state of the surface temperature of the metal sheath based on the obtained comparison of the surface temperature of the metal sheath with the temperature threshold. If the surface temperature of the metal sheath is greater than the first temperature threshold, the computer equipment determines that the surface temperature of the metal sheath is abnormally increased; if the surface temperature of the metal sheath is smaller than a second temperature threshold, the computer equipment determines that the surface temperature of the metal sheath is abnormally reduced, wherein the first temperature threshold is larger than the second temperature threshold; if the surface temperature of the metal sheath is greater than the second temperature threshold value and less than the first temperature threshold value, the computer equipment determines that the surface temperature of the metal sheath is in a normal state.
Similarly, the computer device may determine the state of the ground current according to the obtained comparison result of the ground current of the metal sheath and the current threshold. If the grounding end current is larger than the first current threshold value, the computer equipment determines that the grounding end current of the metal sheath is abnormally increased; if the grounding end current is smaller than the second current threshold, the computer equipment determines that the grounding end current of the metal sheath is abnormally reduced, wherein the first current threshold is larger than the second current threshold; if the grounding end current of the metal sheath is larger than the second current threshold value and smaller than the first current threshold value, the computer equipment determines that the grounding end current of the metal sheath is in a normal state.
Optionally, when the computer device determines that the surface temperature of the metal sheath is in an abnormal state, it further determines whether the state of the current of the grounding end of the metal sheath is in an abnormal state or a normal state, so as to determine whether the cable is subjected to partial discharge. For example, if the surface temperature of the metal sheath is abnormal and the current of the grounding end of the metal sheath is normal, the computer device can determine that the cable is not subjected to partial discharge; if the surface temperature of the metal sheath is in an abnormal state, the current of the grounding end of the metal sheath is also in an abnormal state, and the computer equipment can determine that the cable is subjected to partial discharge.
Optionally, when the current at the grounding end of the metal sheath and the surface temperature of the metal sheath are both in a normal state, the computer equipment needs to collect the discharge information, such as voltage and current information, at a preset position on the cable so as to determine whether the cable is subjected to partial discharge.
And S230, if the cable is subjected to partial discharge, determining the generation position or the discharge stage of the partial discharge of the cable according to the input current of the cable.
Wherein the discharge phase is used for representing the state of partial discharge of the cable. The discharge phase of the partial discharge includes a development phase in which the severity of the partial discharge of the cable is gradually increased, and a pre-breakdown phase in which the partial discharge of the cable approaches breakdown.
Optionally, the computer device may determine a discharge stage of the partial discharge of the cable according to a change of the input current of the cable in combination with a change of the surface temperature of the metal sheath, and determine an occurrence position of the partial discharge of the cable according to a change of the input current of the cable in combination with a change of the current of the ground terminal of the metal sheath.
In this embodiment, the computer device further determines whether the cable is partially discharged according to the state of the ground terminal current when determining that the surface temperature of the metal sheath is in an abnormal state by acquiring the ground terminal current of the metal sheath and the surface temperature of the metal sheath, so that the ground terminal current and the surface temperature of the metal sheath wrapping the cable can reflect the working state of the cable when determining that the cable is partially discharged according to the input current of the cable, the ground terminal current and the surface temperature of the metal sheath can accurately determine whether the cable is partially discharged, the input current of the cable is combined to further determine the occurrence position or the discharge stage of the cable, the detection flexibility is improved compared with the manual determination of the discharge stage according to the discharge information, the determination result is more accurate, and the worker can conveniently adopt corresponding remedial measures after determining the occurrence position/the discharge stage of the partial discharge of the cable so as to reduce the emergency loss caused by the partial discharge of the cable and eliminate the potential safety hazard caused by the partial discharge of the cable.
In one embodiment, when the state of the ground current of the cable metal sheath is normal, the step S220 includes:
if the state of the current of the grounding end is a normal state, determining the abnormal type of the surface temperature of the metal sheath, and judging whether partial discharge occurs to the cable according to the abnormal type.
Wherein, the abnormal type of the surface temperature of the metal sheath comprises local temperature abnormality and overall temperature abnormality.
Specifically, when the state of the current of the grounding end of the metal sheath is determined to be a normal state, the computer equipment further determines the abnormal type of the surface temperature of the metal sheath, specifically determines whether the surface temperature of the metal sheath is abnormal in local temperature or abnormal in whole temperature, and further determines whether partial discharge occurs to the cable according to the abnormal type of the surface temperature of the metal sheath. For example, if the surface temperature of the metal sheath is a local temperature anomaly, the computer device determines that a partial discharge has occurred in the cable; if the surface temperature of the metal sheath is abnormal, the computer equipment determines whether partial discharge occurs to the cable according to the discharge information of the preset position of the cable.
In an alternative embodiment, as shown in fig. 3, the method for determining the anomaly type of the surface temperature of the metal sheath includes:
s310, acquiring the temperature of the preset interval position of the metal sheath.
S320, calculating the temperature difference between the temperatures at the adjacent preset interval positions.
Alternatively, the preset interval positions may be uniformly spaced or non-uniformly spaced. The computer device obtains temperatures obtained by temperature sensors arranged at least two preset interval positions on the metal sheath of the cable, and calculates a temperature difference between temperatures at adjacent preset interval positions. For example, the computer equipment acquires the temperature T of the metal sheath corresponding to the preset interval position A, B, C, D, E by acquiring the temperature sensors at each position, wherein the temperature sensors are correspondingly arranged at 5 preset interval positions of the metal sheath A, B, C, D, E of the cable, which are sequentially and uniformly spaced A 、T B 、T C 、T D 、T E And further obtaining the temperature difference between the temperatures at the adjacent preset interval positions to obtain DeltaT 1 ＝∣T B -T A ∣,△T 2 ＝∣T C -T B ∣,△T 3 ＝∣T D -T C ∣,△T 4 ＝∣T E -T D ∣。
S330, if the temperature difference is larger than the temperature difference threshold value, determining that the abnormal type of the surface temperature of the metal sheath is local temperature abnormality.
And S340, if no temperature difference is greater than a temperature difference threshold value, determining that the abnormal type of the surface temperature of the metal sheath is the whole temperature abnormality.
Specifically, the computer device further compares the resulting temperature difference with a temperature difference thresholdThe magnitude relation between the two to determine the abnormal type of the surface temperature of the metal sheath. If the obtained temperature difference is larger than a temperature difference threshold, the computer equipment determines that the abnormal type of the surface temperature of the metal sheath is local temperature abnormality; if the obtained temperature difference is not greater than the temperature difference threshold, the computer equipment determines that the abnormal type of the surface temperature of the metal sheath is the whole temperature abnormality. For example, if Δt is a temperature difference threshold value, the above Δt is 1 ＞△T，△T 2 ＞△T，△T 3 ＜△T，△T 4 The computer device then determines the type of anomaly in the surface temperature of the metal sheath as a local temperature anomaly.
Alternatively, when the computer device detects that the surface temperature of the metal sheath is abnormally increased, but the current of the grounding end of the metal sheath is in a normal state, it is determined that the abnormal increase of the surface temperature of the metal sheath is caused by the abnormal increase of the input current of the cable.
In an alternative embodiment, after determining that the partial discharge occurs in the cable, the computer device may further determine the position of the partial discharge on the metal sheath according to the position of the surface temperature in the abnormal state, that is, determine that the position of the surface temperature in the abnormal state on the metal sheath is the position of the partial discharge on the cable. For example, the computer device determines that the surface temperature of the metal sheath at the position D is in an abnormal state according to the temperature sensors at five preset positions on the cable A, B, C, D, E, and then can determine that the position D is the occurrence position of the partial discharge of the cable.
In this embodiment, when the state of the surface temperature of the metal sheath is determined to be an abnormal state and the state of the current of the grounding end of the metal sheath is determined to be a normal state, the computer device further determines the abnormal type of the surface temperature of the metal sheath, if the abnormal type of the surface temperature of the metal sheath is a local temperature abnormality, determines that the cable is partially discharged, directly determines that the cable is partially discharged when the surface temperature of the metal sheath is a local temperature abnormality, and does not need to acquire discharge information at a preset position to judge whether the partial discharge is generated, so that the process of determining whether the cable is partially discharged is simplified, and the efficiency of detecting the cable partial discharge is improved as a whole.
In one embodiment, to improve the accuracy of determining the state of the ground current and the surface temperature of the metal sheath, as shown in fig. 4, the method of determining the state of the ground current and the surface temperature of the metal sheath includes:
s410, acquiring the current variation of the current of the grounding end within a preset time period, and determining the state of the current of the grounding end according to the relation between the current variation and the current variation threshold.
Specifically, the computer device obtains the current variation delta I of the current of the grounding end of the metal sheath within a preset time period t, and compares the current variation delta I with a current variation threshold delta I 0 If DeltaI > DeltaI 0 The computer equipment determines the state of the current of the grounding terminal as an abnormal state, if delta I is less than or equal to delta I 0 The computer device determines that the state of the ground current is a normal state.
S420, acquiring the temperature variation of the surface temperature of the metal sheath within a preset time period, and determining the state of the surface temperature of the metal sheath according to the relation between the temperature variation and the temperature variation threshold.
Specifically, the computer device acquires the temperature variation DeltaW of the surface temperature of the metal sheath within a preset time period t, and compares the temperature variation DeltaW with a temperature variation threshold DeltaW 0 If DeltaW > DeltaW 0 The computer equipment determines that the state of the current of the grounding terminal is an abnormal state, if DeltaW is less than or equal to DeltaW 0 The computer device determines that the state of the ground current is a normal state.
In this embodiment, the computer device determines the state of the grounding end current of the metal sheath according to the current variation of the grounding end current of the metal sheath within the preset time period, and determines the state of the surface temperature of the metal sheath according to the current variation of the surface temperature of the metal sheath within the preset time period, and the accuracy of determining the state of the grounding end current and the surface temperature of the metal sheath can be further improved by determining the state in a variable manner relative to a manner of determining the state by using single data.
In one embodiment, for determining the partial discharge phase of the bit cable, as shown in fig. 5, S230 includes:
and S510, if the surface temperature of the metal sheath is increased and the input current of the cable is increased, determining that the discharge stage of the partial discharge of the cable is a development stage.
Wherein the severity of the partial discharge of the cable, which is used in the development stage, becomes severe with increasing input current.
Specifically, after determining that the partial discharge occurs in the cable, the computer device may further obtain the input current of the cable, and if the surface temperature of the metal sheath increases while the input current of the cable also increases, which indicates that the surface temperature increase of the metal sheath is caused by the increase of the input current of the cable at this time, the computer device determines that the discharge stage of the partial discharge of the cable is a development stage, and the severity of the partial discharge becomes serious with the increase of the input current.
S520, if the surface temperature of the metal sheath is increased and the input current is in a stable state, determining that the discharge stage of the partial discharge of the cable is a pre-breakdown stage.
Wherein the pre-breakdown stage is used to characterize the cable near breakdown.
Specifically, if the surface temperature of the metal sheath increases while the input current of the cable is in a steady state, which means that the surface temperature of the metal sheath increases independently of the input current of the cable, the computer device determines that the discharge phase of the partial discharge of the cable is a pre-breakdown phase, and the cable is broken down in the vicinity.
In this embodiment, after the computer device determines that the partial discharge occurs in the cable, the discharge stage of the partial discharge is further determined according to the change condition of the input current of the cable and the surface temperature of the metal sheath, specifically, the discharge stage of the partial discharge of the cable is determined to be a development stage when the surface temperature of the metal sheath is increased and the input current of the cable is also increased, and the discharge stage of the partial discharge of the cable is determined to be a pre-breakdown stage when the surface temperature of the metal sheath is increased and the input current of the cable is in a stable state, so that the discharge stage of the partial discharge of the cable is accurately determined, and the method is favorable for a worker to implement a remedy measure of the discharge stage in a targeted manner when the discharge stage of the partial discharge of the cable is defined, thereby improving the remedy effect, further reducing economic loss caused by the partial discharge of the cable, and timely eliminating potential safety hazards caused by the partial discharge of the cable.
In one embodiment, when the state of the ground current of the cable metal sheath is also abnormal, as shown in fig. 6, S220 includes:
and S610, if the state of the current of the grounding end is an abnormal state, acquiring the discharge information of the preset position of the cable, and judging whether the cable is subjected to partial discharge or not according to the discharge information of the preset position.
The discharge information includes a discharge voltage, a discharge phase, and a discharge frequency.
And S620, if the discharge information of the preset position meets the partial discharge characteristic, determining that the cable is subjected to partial discharge.
Optionally, if the state of the surface temperature of the metal sheath is an abnormal state and the state of the current of the grounding end of the metal sheath is also an abnormal state, the computer device further obtains the discharge information at the preset positions of the cable, and further judges whether the preset positions are subjected to partial discharge according to whether the discharge information at each preset position meets the partial discharge characteristics. For example, if the computer device obtains that the discharge voltage at the preset position reaches the preset voltage, it is determined that partial discharge occurs at the preset position. Optionally, the computer device may further determine the discharge phase and the partial discharge type in combination with the discharge phase and the discharge frequency. The partial discharge type comprises a main insulation partial discharge with a partial discharge position located in the cable, and a non-main insulation partial discharge with a partial discharge position not located in the cable.
If the surface temperature of the metal sheath is abnormally increased, the grounding end current of the metal sheath is also abnormally increased, the abnormal increase of the surface temperature of the metal sheath is determined to be caused by the abnormal increase of the grounding end current, and if the computer equipment also detects that partial discharge occurs at a certain preset position of the cable, the abnormal increase of the grounding end current accelerates the development of the partial discharge and aggravates the severity of the partial discharge.
In an alternative embodiment, where the cable further includes a metal clip for securing the metal sheath, as shown in fig. 7, the method further includes:
and S710, if the cable is subjected to partial discharge, acquiring the type of the partial discharge of the cable.
And S720, if the partial discharge type of the cable is non-main insulation partial discharge, determining that partial discharge occurs between the metal sheath and the metal clamp.
Specifically, if the cable further includes a metal fixture for fixing the metal sheath, the computer device further obtains the partial discharge type of the cable when determining that the partial discharge occurs in the cable, so as to determine the occurrence position of the partial discharge on the cable according to the partial discharge type. The partial discharge type can be determined by the computer equipment according to the discharge information of the preset position. If the partial discharge type of the cable is non-main insulation partial discharge, determining that partial discharge occurs between the metal sheath and the metal clamp.
In this embodiment, when the computer device determines that the surface temperature of the metal sheath and the state of the current of the grounding end are abnormal, it determines whether partial discharge occurs in the cable by acquiring the discharge information of the preset position of the cable, and further determines that the partial discharge occurs as the position when the partial discharge occurs is determined, so that the comprehensive detection on whether the partial discharge occurs in the cable is realized, and the comprehensive detection is further improved.
In one embodiment, the cable further includes a metal fixture for fixing the metal sheath, so as to determine the occurrence position of the partial discharge of the cable, and S330 includes:
if the ground current increases and the input current of the cable also increases, or if the ground current decreases and the input current of the cable assumes a steady state, it is determined that a partial discharge occurs between the metal sheath and the metal clamp.
Specifically, if the input current of the cable increases while the current of the ground terminal of the metal sheath increases, the induced potential between the metal sheath and the cable increases, and the computer device determines that partial discharge occurs between the metal sheath and the metal jig. If the current of the grounding end of the metal sheath is reduced, the input current of the cable is in a stable state, which means that the grounding resistance of the metal sheath is increased, so that the induced potential between the metal sheath and the cable is increased, and further the current of the grounding end is reduced, the computer equipment determines that partial discharge occurs between the metal sheath and the metal clamp, and the insulation of the cable does not occur main insulation partial discharge. Alternatively, if the input current of the cable is reduced at the same time as the ground current of the metal sheath is reduced, it is stated that the ground current reduction is caused by the reduction of the input current of the cable, the partial discharge of the cable is not affected.
In this embodiment, after the computer device determines that the partial discharge occurs in the cable, the position where the partial discharge occurs is further determined according to the change condition of the input current of the cable and the surface temperature of the metal sheath, and specifically, the partial discharge is determined between the metal sheath and the metal clamp for fixing the metal sheath when the input current increases and the current of the ground terminal increases, or when the current of the ground terminal decreases and the input current of the cable presents a stable state. The occurrence position of the partial discharge of the cable is defined, the working personnel can conduct the remedy measures of the occurrence position in a targeted manner, the remedy effect is improved, the economic loss caused by the partial discharge of the cable is further reduced, and the potential safety hazard caused by the partial discharge of the cable is eliminated in time.
It should be understood that, although the steps in the flowcharts of fig. 2-7 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in FIGS. 2-7 may include multiple steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the steps or stages in other steps or other steps.
In one embodiment, as shown in fig. 8, there is provided a detection device for partial discharge of a cable, the cable being wrapped with a metal sheath for grounding, the device comprising: a parameter acquisition module 801, a discharge judgment module 802, and a discharge positioning module 803. Wherein:
the parameter obtaining module 801 is configured to obtain a ground current of the metal sheath and a surface temperature of the metal sheath;
the discharging judgment module 802 is configured to judge whether partial discharging occurs in the cable according to the state of the ground current when the state of the surface temperature of the metal sheath is an abnormal state; wherein, the state of the ground terminal current comprises an abnormal state or a normal state;
the discharge positioning module 803 is configured to determine, in a case where a partial discharge occurs in the cable, a position or a discharge stage of the partial discharge of the cable according to an input current of the cable.
In one embodiment, the discharge determination module 802 is specifically configured to:
if the state of the current of the grounding end is a normal state, determining the abnormal type of the surface temperature of the metal sheath, and judging whether partial discharge occurs to the cable according to the abnormal type.
In one embodiment, the discharge determination module 802 is specifically configured to:
Acquiring the temperature of a preset interval position of the metal sheath; calculating a temperature difference between temperatures at adjacent preset interval positions; if the temperature difference is larger than the temperature difference threshold value, determining that the abnormal type of the surface temperature of the metal sheath is local temperature abnormality; if the temperature difference is not greater than the temperature difference threshold, determining that the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality.
In one embodiment, the discharge determination module 802 is specifically configured to:
and if the abnormal type of the surface temperature of the metal sheath is the local temperature abnormality, determining that the cable is subjected to local discharge.
In one embodiment, the discharge positioning module 803 is specifically configured to:
if the surface temperature of the metal sheath is increased and the input current of the cable is increased, determining a discharge stage of partial discharge of the cable as a development stage; wherein, the severity of the partial discharge of the cable used for representing the development stage becomes serious with the increase of the input current; if the surface temperature of the metal sheath is increased and the input current of the cable is in a stable state, determining that the discharge stage of partial discharge of the cable is a pre-breakdown stage; wherein the pre-breakdown stage is used to characterize the cable near breakdown.
In one embodiment, the discharge positioning module 803 is further configured to:
and determining the occurrence position of partial discharge according to the position of the surface temperature in the abnormal state on the metal sheath.
In one embodiment, the discharge determination module 802 is specifically configured to:
if the state of the current of the grounding end is an abnormal state, acquiring the discharge information of the preset position of the cable, and judging whether the discharge information of the preset position meets the partial discharge characteristic; the discharge information comprises discharge voltage, discharge phase and discharge frequency; and if the discharge information of the preset position meets the partial discharge characteristic, determining that the cable is subjected to partial discharge.
In one embodiment, the cable further comprises a metal clamp for fixing the metal sheath, and the discharge positioning module 803 is specifically configured to:
if the ground current increases and the input current of the cable also increases, or if the ground current decreases and the input current of the cable assumes a steady state, it is determined that a partial discharge occurs between the metal sheath and the metal clamp.
In one embodiment, the cable further comprises a metal clamp for securing the metal sheath, and the discharge positioning module 803 is further configured to:
if the cable is subjected to partial discharge, acquiring the type of the partial discharge of the cable; if the partial discharge type of the cable is non-main insulation partial discharge, determining that partial discharge occurs between the metal sheath and the metal clamp.
For specific limitations of the cable partial discharge detection device, reference may be made to the above limitation of the cable partial discharge detection method, and no further description is given here. The above-mentioned modules in the cable partial discharge detection device may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 8. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of detecting partial discharge of a cable. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 8 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
acquiring the current of a grounding end of the metal sheath and the surface temperature of the metal sheath; when the state of the surface temperature of the metal sheath is an abnormal state, judging whether partial discharge occurs to the cable according to the state of the current of the grounding end; wherein, the state of the grounding end current comprises an abnormal state or a normal state; if the cable is subjected to partial discharge, determining the occurrence position or the discharge stage of the partial discharge of the cable according to the input current of the cable.
In one embodiment, the processor when executing the computer program further performs the steps of:
if the state of the current of the grounding end is a normal state, determining the abnormal type of the surface temperature of the metal sheath, and judging whether partial discharge occurs to the cable according to the abnormal type.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring the temperature of a preset interval position of the metal sheath; calculating a temperature difference between temperatures at adjacent preset interval positions; if the temperature difference is larger than the temperature difference threshold value, determining that the abnormal type of the surface temperature of the metal sheath is local temperature abnormality; if the temperature difference is not greater than the temperature difference threshold, determining that the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality.
In one embodiment, the processor when executing the computer program further performs the steps of:
and if the abnormal type of the surface temperature of the metal sheath is the local temperature abnormality, determining that the cable is subjected to local discharge.
In one embodiment, the processor when executing the computer program further performs the steps of:
if the surface temperature of the metal sheath is increased and the input current of the cable is increased, determining a discharge stage of partial discharge of the cable as a development stage; wherein, the severity of the partial discharge of the cable used for representing the development stage becomes serious with the increase of the input current; if the surface temperature of the metal sheath is increased and the input current of the cable is in a stable state, determining that the discharge stage of partial discharge of the cable is a pre-breakdown stage; wherein the pre-breakdown stage is used to characterize the cable near breakdown.
In one embodiment, the processor when executing the computer program further performs the steps of:
and determining the occurrence position of partial discharge according to the position of the surface temperature in the abnormal state on the metal sheath.
In one embodiment, the processor when executing the computer program further performs the steps of:
if the state of the current of the grounding end is an abnormal state, acquiring the discharge information of the preset position of the cable, and judging whether the discharge information of the preset position meets the partial discharge characteristic; the discharge information comprises discharge voltage, discharge phase and discharge frequency; and if the discharge information of the preset position meets the partial discharge characteristic, determining that the cable is subjected to partial discharge.
In one embodiment, the cable further comprises a metal clamp for securing the metal sheath, the processor executing the computer program further performing the steps of:
if the ground current increases and the input current of the cable also increases, or if the ground current decreases and the input current of the cable assumes a steady state, it is determined that a partial discharge occurs between the metal sheath and the metal clamp.
In one embodiment, the cable further comprises a metal clamp for fixing the metal sheath, and the processor when executing the computer program further performs the steps of:
If the cable is subjected to partial discharge, acquiring the type of the partial discharge of the cable; if the partial discharge type of the cable is non-main insulation partial discharge, determining that partial discharge occurs between the metal sheath and the metal clamp.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring the current of a grounding end of the metal sheath and the surface temperature of the metal sheath; when the state of the surface temperature of the metal sheath is an abnormal state, judging whether partial discharge occurs to the cable according to the state of the current of the grounding end; wherein, the state of the grounding end current comprises an abnormal state or a normal state; if the cable is subjected to partial discharge, determining the occurrence position or the discharge stage of the partial discharge of the cable according to the input current of the cable.
In one embodiment, the computer program when executed by the processor further performs the steps of:
if the state of the current of the grounding end is a normal state, determining the abnormal type of the surface temperature of the metal sheath, and judging whether partial discharge occurs to the cable according to the abnormal type.
In one embodiment, the computer program when executed by the processor further performs the steps of:
Acquiring the temperature of a preset interval position of the metal sheath; calculating a temperature difference between temperatures at adjacent preset interval positions; if the temperature difference is larger than the temperature difference threshold value, determining that the abnormal type of the surface temperature of the metal sheath is local temperature abnormality; if the temperature difference is not greater than the temperature difference threshold, determining that the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and if the abnormal type of the surface temperature of the metal sheath is the local temperature abnormality, determining that the cable is subjected to local discharge.
In one embodiment, the computer program when executed by the processor further performs the steps of:
if the surface temperature of the metal sheath is increased and the input current of the cable is increased, determining a discharge stage of partial discharge of the cable as a development stage; wherein, the severity of the partial discharge of the cable used for representing the development stage becomes serious with the increase of the input current; if the surface temperature of the metal sheath is increased and the input current of the cable is in a stable state, determining that the discharge stage of partial discharge of the cable is a pre-breakdown stage; wherein the pre-breakdown stage is used to characterize the cable near breakdown.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and determining the occurrence position of partial discharge according to the position of the surface temperature in the abnormal state on the metal sheath.
In one embodiment, the computer program when executed by the processor further performs the steps of:
if the state of the current of the grounding end is an abnormal state, acquiring the discharge information of the preset position of the cable, and judging whether the discharge information of the preset position meets the partial discharge characteristic; the discharge information comprises discharge voltage, discharge phase and discharge frequency; and if the discharge information of the preset position meets the partial discharge characteristic, determining that the cable is subjected to partial discharge.
In one embodiment, the cable further comprises a metal clamp securing the metal sheath, the computer program when executed by the processor further performing the steps of:
if the ground current increases and the input current of the cable also increases, or if the ground current decreases and the input current of the cable assumes a steady state, it is determined that a partial discharge occurs between the metal sheath and the metal clamp.
In one embodiment, the cable further comprises a metal clamp for securing the metal sheath, the computer program when executed by the processor further performing the steps of:
If the cable is subjected to partial discharge, acquiring the type of the partial discharge of the cable; if the partial discharge type of the cable is non-main insulation partial discharge, determining that partial discharge occurs between the metal sheath and the metal clamp.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, or the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A method of detecting partial discharge of a cable, the cable being surrounded by a metal sheath for grounding, the method comprising:
acquiring the grounding end current of the metal sheath and the surface temperature of the metal sheath;
when the state of the surface temperature of the metal sheath is an abnormal state, if the state of the grounding end current is a normal state, acquiring the temperature of the metal sheath at a preset interval position;
Calculating a temperature difference between temperatures at adjacent preset spaced positions;
if the temperature difference is larger than a temperature difference threshold value, determining that the abnormal type of the surface temperature of the metal sheath is local temperature abnormality;
if the temperature difference is not greater than the temperature difference threshold, determining that the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality; wherein the state of the ground current includes an abnormal state or a normal state; the abnormal types of the surface temperature of the metal sheath comprise local temperature abnormality and overall temperature abnormality;
if the abnormal type of the surface temperature of the metal sheath is local temperature abnormality, determining that the cable is subjected to local discharge; if the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality, determining whether partial discharge occurs to the cable according to the discharge information of the preset position of the cable; the discharge information comprises discharge voltage, discharge phase and discharge frequency;
if the cable is subjected to partial discharge, determining a discharge stage of the partial discharge of the cable according to the input current of the cable and the surface temperature of the metal sheath, and determining the occurrence position of the partial discharge according to the position of the surface temperature of the metal sheath on the metal sheath.
2. The method of claim 1, wherein determining a discharge phase of the partial discharge of the cable based on an input current of the cable in combination with a surface temperature of the metal sheath comprises:
if the surface temperature of the metal sheath is increased and the input current of the cable is increased, determining that the discharge stage of the partial discharge of the cable is a development stage; wherein the development stage is used to characterize the severity of the partial discharge of the cable as the input current increases;
if the surface temperature of the metal sheath is increased and the input current of the cable is in a stable state, determining that the discharge stage of the partial discharge of the cable is a pre-breakdown stage; wherein the pre-breakdown stage is used to characterize the cable near breakdown.
3. The method according to claim 1, wherein the method further comprises:
and acquiring the current variation of the current of the grounding end within a preset time period, and determining the state of the current of the grounding end according to the relation between the current variation and a preset current variation threshold value.
4. The method according to claim 1, wherein the method further comprises:
Acquiring the temperature variation of the surface temperature of the metal sheath within a preset time period, and determining the state of the surface temperature of the metal sheath according to the relation between the temperature variation and a preset temperature variation threshold.
5. The method according to any one of claims 1 to 4, wherein if the type of abnormality of the surface temperature of the metal sheath is an overall temperature abnormality, determining whether partial discharge occurs in the cable according to the discharge information of the preset position of the cable includes:
if the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality, acquiring the discharge information of the preset position of the cable, and judging whether the discharge information of the preset position of the cable meets the partial discharge characteristic;
and if the discharge information of the preset position of the cable meets the partial discharge characteristic, determining that partial discharge occurs to the cable.
6. The method of claim 5, wherein the cable further comprises a metal clamp securing the metal jacket, the method further comprising:
if the ground current increases and the input current of the cable also increases, or if the ground current decreases and the input current of the cable assumes a steady state, it is determined that partial discharge occurs between the metal sheath and the metal clamp.
7. The method of claim 5, wherein the cable further comprises a metal clamp securing the metal jacket, the method further comprising:
if the cable is subjected to partial discharge, acquiring the partial discharge type of the cable;
and if the partial discharge type of the cable is non-main insulation partial discharge, determining that partial discharge occurs between the metal sheath and the metal clamp.
8. A device for detecting partial discharge of a cable, said cable being surrounded by a metal sheath for grounding, said device comprising:
the parameter acquisition module is used for acquiring the grounding end current of the metal sheath and the surface temperature of the metal sheath;
the discharging judgment module is used for acquiring the temperature of the preset interval position of the metal sheath if the state of the grounding end current is a normal state when the state of the surface temperature of the metal sheath is an abnormal state; calculating a temperature difference between temperatures at adjacent preset spaced positions; if the temperature difference is larger than a temperature difference threshold value, determining that the abnormal type of the surface temperature of the metal sheath is local temperature abnormality; if the temperature difference is not greater than the temperature difference threshold, determining that the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality; wherein the state of the ground current includes an abnormal state or a normal state; the abnormal types of the surface temperature of the metal sheath comprise local temperature abnormality and overall temperature abnormality; if the abnormal type of the surface temperature of the metal sheath is local temperature abnormality, determining that the cable is subjected to local discharge; if the abnormal type of the surface temperature of the metal sheath is the overall temperature abnormality, determining whether partial discharge occurs to the cable according to the discharge information of the preset position of the cable; the discharge information comprises discharge voltage, discharge phase and discharge frequency;
And the discharge positioning module is used for determining the discharge stage of the partial discharge of the cable according to the input current of the cable and the surface temperature of the metal sheath under the condition that the partial discharge of the cable occurs, and determining the occurrence position of the partial discharge according to the position of the surface temperature of the metal sheath on the metal sheath.
9. The apparatus of claim 8, wherein the discharge positioning module comprises:
the first discharge positioning unit is used for determining that the discharge stage of the partial discharge of the cable is a development stage if the surface temperature of the metal sheath is increased and the input current of the cable is increased; wherein the development stage is used to characterize the severity of the partial discharge of the cable as the input current increases;
the second discharge positioning unit is used for determining that the discharge stage of the partial discharge of the cable is a pre-breakdown stage if the surface temperature of the metal sheath is increased and the input current of the cable is in a stable state; wherein the pre-breakdown stage is used to characterize the cable near breakdown.
10. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 8 when the computer program is executed.
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| DE102010061607A1 (en) * | 2010-12-28 | 2012-06-28 | Bundesanstalt für Materialforschung und -Prüfung (BAM) | High-voltage device and method for monitoring aging processes of insulation in a high-voltage device |
| CN104714155B (en) * | 2015-02-02 | 2017-12-15 | 西安交通大学 | A kind of detection to direct current XLPE cable shelf depreciation and apparatus for evaluating and method |
| CN105115626B (en) * | 2015-09-17 | 2018-02-23 | 李成 | Single-core high-voltage cable joint intelligent monitor system and intelligent monitoring method |
| CN106093722B (en) * | 2016-06-13 | 2019-03-12 | 国网上海市电力公司 | A kind of positioning and recognition methods of cable local discharge |
| CN208833873U (en) * | 2018-09-19 | 2019-05-07 | 西安科技大学 | A kind of low voltage mine cable insulation monitoring device |
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| CN110780157A (en) * | 2019-11-19 | 2020-02-11 | 湖南国奥电力设备有限公司 | Temperature-based underground cable fault judgment method and device |
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