CN110045238A - Cable shield fault determination method, device, equipment and storage medium - Google Patents
Cable shield fault determination method, device, equipment and storage medium Download PDFInfo
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- CN110045238A CN110045238A CN201910278243.4A CN201910278243A CN110045238A CN 110045238 A CN110045238 A CN 110045238A CN 201910278243 A CN201910278243 A CN 201910278243A CN 110045238 A CN110045238 A CN 110045238A
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- cable shield
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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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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of cable shield fault determination method, device, equipment and storage mediums, to solve in the related technology, the problem of can not knowing cable shield failure, the ground terminal of the cable shield and ungrounded end constitute circuit by first-grade protection circuit, current sensor is provided on the circuit, the cable shield fault determination method includes: to receive the current data of the collected ground terminal of current sensor and the ungrounded end；Determine that the state of the cable shield, the state of the cable shield include at least following one kind according to the current data: the cable shield short circuit, cable shield broken string and cable shield electric leakage.The cable shield fault determination method can conveniently know cable shield failure.
Description
Technical field
The present invention relates to Cable Fault Detection Technology field, a kind of cable shield fault determination method, dress are particularly related to
It sets, equipment and storage medium.
Background technique
Currently, the power cable of 35kV, 66kV, 110kV and 110kV above is single-core cable, cable gold
Belong to shielded layer (being also referred to as cable shield below) one end three-phase to interconnect and be grounded, the other end is earth-free, when in lightning wave or cable
When portion's overvoltage is flowed along cable core, the ungrounded end of cable shield will appear higher impulse overvoltage；Or when system is short
When road fault current flows through cable core, the earth-free end of shielded layer also will appear very high line-frequency induction overvoltage；Or in electricity
In the case that cable power supply distance is longer and cable shield aging, cable shield is ungrounded under system normal running (operation) conditions
End also will appear higher line-frequency induction voltage, persistently generate damage to cable external shielding layer.It is generated in the above various situations
Overvoltage may puncture cable external shielding layer, cause cable shield multipoint earth faults, it is normal to seriously affect power cable
Operation, or even will be greatly shortened cable service life.But lead to nothing due to that can not know the operating status of cable shield at present
Method takes effective measures before failure appearance.
Summary of the invention
In view of this, it is an object of the invention to propose a kind of cable shield fault determination method, device, equipment and deposit
Storage media, the cable shield fault determination method can conveniently and efficiently determine the state of cable shield, can be improved to cable
The efficiency of shielded layer progress malfunction monitoring.
According to the first aspect of the invention, a kind of cable shield fault determination method, the cable shield are provided
The ground terminal of layer and ungrounded end are provided with current sensor on the circuit by first-grade protection circuit composition circuit, described
Method includes: to receive the current data of the collected ground terminal of current sensor and the ungrounded end；According to
The current data determines that the state of the cable shield, the state of the cable shield include at least following one kind: institute
State cable shield short circuit, cable shield broken string and cable shield electric leakage.
Optionally, the state of the shielded layer of the cable is determined according to the current data, comprising: when receiving twice in succession
To the current data described in the difference of current value of ground terminal be greater than first threshold when determine cable shield short circuit；
Alternatively, the difference of the current value of ground terminal described in the current data that ought be received twice in succession is greater than first threshold and described
The current value at ungrounded end level off to zero when, determine cable shield short circuit.
Optionally, the state of the shielded layer of the cable is determined according to the current data, comprising: described in receiving
When the electric current of ground terminal described in current data and the electric current at the ungrounded end are less than second threshold, the cable screens are determined
Cover layer broken string.
Optionally, the state of the shielded layer of the cable is determined according to the current data, comprising: described in receiving
The difference of the current value of ground terminal described in current data and default operating current is greater than third threshold value, and/or, what is received is described
When the difference of the electric current at ungrounded end described in current data and the default operating current is less than the third threshold value, described in determination
Cable shield electric leakage.
Optionally, the first-grade protection circuit includes at least capacitor.
According to the second aspect of the invention, a kind of cable shield failure determination device, the cable shield are provided
The ground terminal of layer and ungrounded end are provided with current sensor on the circuit by first-grade protection circuit composition circuit, described
Device includes: receiving module, for receiving the collected ground terminal of the current sensor and the ungrounded end
Current data；Determining module, for determining the state of the cable shield, the cable shield according to the current data
State include at least following one kind: cable shield short circuit, cable shield broken string and the cable shield
Layer electric leakage.
Optionally, the determining module is used for: the ground terminal described in the current data received twice in succession
The difference of current value determines the cable shield short circuit when being greater than first threshold；Alternatively, the electricity that ought be received twice in succession
The current value that the difference of the current value of ground terminal described in flow data is greater than the first threshold and the ungrounded end levels off to zero
When, determine the cable shield short circuit.
Optionally, the determining module is used for: the electric current of the ground terminal described in the current data received and
When the electric current at the ungrounded end is less than second threshold, the cable shield broken string is determined.
According to the third aspect of the present invention, a kind of electronic equipment is provided, including memory, processor and being stored in is deposited
On reservoir and the computer program that can run on a processor, the processor are realized when executing described program such as the present invention first
Any one cable shield fault determination method of a aspect.
According to the fourth aspect of the present invention, a kind of non-transient computer readable storage medium is provided, it is described non-transient
Computer-readable recording medium storage computer instruction, the computer instruction is for making the computer execute the present invention first
Any one cable shield fault determination method of a aspect.
From the above it can be seen that cable shield fault determination method provided by the invention, passes through electric current vent discharge
The ground terminal of cable shield and ungrounded end are constituted circuit by road, can be surveyed by the current sensor being set in the circuit
The current value for obtaining cable shielding layer earthing end and ungrounded end, can determine the state of cable shield according to the current value, can be square
Just quickly the failure of cable shield is monitored.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of flow chart of cable shield fault determination method shown according to an exemplary embodiment；
Fig. 2 is a kind of schematic diagram in cable shielding layer earthing circuit shown according to an exemplary embodiment；
Fig. 3 is a kind of block diagram of cable shield failure determination device shown according to an exemplary embodiment；
Fig. 4 is a kind of cable shield on-line monitoring shown according to an exemplary embodiment and status assessing system shows
It is intended to.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
It should be noted that all tables for using " first ", " second ", " third " and " the 4th " in the embodiment of the present invention
It states and is for distinguishing two non-equal entities of same names or non-equal parameter, it is seen that " first ", " second " " the
Three " and " the 4th " only for the convenience of statement, should not be construed as the restriction to the embodiment of the present invention, subsequent embodiment to this not
An another explanation.
Fig. 1 is a kind of flow chart of cable shield fault determination method shown according to an exemplary embodiment, described
(hereinafter referred to as cable shielding layer earthing returns by first-grade protection circuit composition circuit for the ground terminal of cable shield and ungrounded end
Road), current sensor is provided on the circuit, and the cable shield fault determination method can for example be supervised by cable shield
It surveys device to execute, which can be connect with current sensor by communication cable, for example, connecting by RS485 communication cable
It connects, as shown in Figure 1, the cable shield fault determination method includes:
Step 101: receiving the electric current number at the collected ground terminal of the current sensor and the ungrounded end
According to；
Step 102: the state of the cable shield, the state of the cable shield are determined according to the current data
Including at least following one kind:
The cable shield short circuit, cable shield broken string and cable shield electric leakage.
The cable shield fault determination method of the embodiment of the present invention passes through first-grade protection circuit connecing cable shield
Ground terminal and ungrounded end constitute circuit, can measure cable shielding layer earthing end by the current sensor being set in the circuit
With the current value at ungrounded end, the state of cable shield can determine according to the current value, it can be conveniently and efficiently to cable shield
The failure of layer is monitored.
Fig. 2 is a kind of schematic diagram in cable shielding layer earthing circuit shown according to an exemplary embodiment, below in conjunction with
Fig. 2 is illustrated above-mentioned cable shield fault determination method.
As shown in Fig. 2, one end of current sensor 22 is connected with the ungrounded end 21 of cable shield, current sensor 22
The other end is connected with first-grade protection circuit 23, and current sensor 22 is used to detect the electric current at ungrounded 21 end of end, current sensor
24 one end is connected with the other end of first-grade protection circuit 23, the other end of current sensor 24 and cable shielding layer earthing end
GND is connected, and current sensor 24 is used for the electric current at detection cable shielding layer grounding end.In a kind of achievable mode, electric current is passed
Sensor can be sent to shielded layer monitoring device with the current data that a predetermined period is periodically detected, be based on this,
Shielded layer detection device can pass through the electricity of adjacent certain one end received (i.e. in two adjacent predetermined periods) twice of comparison
Current value in flow data can determine situation of change of the electric current at the end in a predetermined period, thus according to the situation of change
Determine the state of cable shield, the situation of change such as current value increases in a short time, or reduces.
Since in cable normal use process, usually there is faint electricity in cable shielding layer earthing end and ungrounded end
Stream, the electric current are less than the 10% of load current, therefore can be according to the variation feelings of the ground terminal and the ungrounded end current value
Condition determines the state of cable shield.Below to the situation of change according to the ground terminal and the ungrounded end current value
To determine that several achievable modes of the state of cable shield are illustrated.
In a kind of achievable mode, the state of the shielded layer of the cable is determined according to the current data can include:
When the difference of the current value of the ground terminal described in the current data received twice in succession is greater than first threshold, determine described in
Cable shield short circuit, wherein the first threshold for example can be shielded layer electric current when cable is in normal operating condition 3~
4 times or 4 times or more；Alternatively, the difference of the current value of ground terminal described in the current data that ought be received twice in succession is greater than
The current value at the first threshold and the ungrounded end level off to zero when, determine cable shield short circuit.It, can based on this
When moment increase situation occurs in electric current at cable shielding layer earthing end, cable shield short circuit is determined, or in cable shield
There is moment and increases situation and cable shield and connect the current value at end non-ly and be reduced to when leveling off to zero in layer ground terminal electric current, determines
Cable shield short circuit.
In a kind of achievable mode, the state of the shielded layer of the cable is determined according to the current data can include:
When the electric current of the ground terminal described in the current data received and the electric current at the ungrounded end are less than second threshold,
Determine that the cable shield broken string, the second threshold for example can be 1%~2% less than load current.Another kind can
In implementation, the electric current of ground terminal described in the current data received and the electric current at the ungrounded end are less than
Second threshold, and (process that disconnection fault reduces shielded layer current value) when this kind of situation holding a period of time,
It can determine that cable shield breaks.It, can be when the electric current at cable shielding layer earthing end and ungrounded end be decreased to zero based on this
Determine that cable shield breaks, so as to caused by cable shield is due to manufacture craft, transport or installation etc.
When shielded layer welding portion is broken, the failure is detected.
In a kind of achievable mode, the state of the shielded layer of the cable is determined according to the current data can include:
The current value of the ground terminal described in the current data received and the difference of default operating current are greater than third threshold value, and/
Or, the difference of the electric current at ungrounded end described in the current data received and the default operating current is less than the third
When threshold value, the cable shield electric leakage is determined.Wherein, when default operating current can be cable and be in normal operating conditions,
A lesser value can be set in electric current in shielded layer, third threshold value, which for example may be greater than the 10% of load current,
As the time is more long, insulation breakdown is more serious, and electric current can be increasing, may make in this way, in the ground terminal of cable shield
When electric current has a faint increase than its running current or the electric current at the ungrounded end of cable shield is than its running current
When having faint reduction, it may be determined that there are electrical leakage problems for cable shield.
In a kind of achievable mode, the first-grade protection circuit includes at least capacitor, such as may make cable shield
The ground terminal of layer and ungrounded end are connected by the capacitor, and further, which may also include and be somebody's turn to do
The concatenated resistance of capacitor.
Fig. 3 is a kind of block diagram of cable shield failure determination device shown according to an exemplary embodiment, the electricity
The ground terminal of cable shielded layer and ungrounded end constitute circuit by first-grade protection circuit, are provided with current sense on the circuit
Device, the cable shield failure determination device can for example be realized by above-mentioned cable shield monitoring device, as shown in figure 3, should
Device 30 includes:
Receiving module 31, for receiving the collected ground terminal of the current sensor and the ungrounded end
Current data；
Determining module 32, for determining the state of the cable shield, the cable shield according to the current data
The state of layer includes at least following one kind:
The cable shield short circuit, cable shield broken string and cable shield electric leakage.
In a kind of achievable mode, the determining module 32 can be used for: when the electric current number received twice in succession
The difference of the current value of the ground terminal described in determines the cable shield short circuit when being greater than first threshold；Alternatively, working as continuous two
The difference of the current value of ground terminal described in the secondary current data received is greater than the electricity at first threshold and the ungrounded end
Flow valuve level off to zero when, determine cable shield short circuit.
In a kind of achievable mode, the determining module 32 can be used for: described in the current data received
When the electric current of ground terminal and the electric current at the ungrounded end are less than second threshold, the cable shield broken string is determined.
In a kind of achievable mode, the determining module 32 can be used for: described in the current data received
The difference of the current value of ground terminal and default operating current is greater than third threshold value, and/or, described in the current data received
When the difference of the electric current at ungrounded end and the default operating current is less than the third threshold value, the cable shield leakage is determined
Electricity.
In a kind of achievable mode, the first-grade protection circuit includes at least capacitor.
The device of above-described embodiment for realizing method corresponding in previous embodiment there is corresponding method to implement
The beneficial effect of example, details are not described herein.
Fig. 4 is a kind of cable shield on-line monitoring shown according to an exemplary embodiment and status assessing system shows
It is intended to, as shown in figure 4, the electricity that the system includes: the threephase cable of alter-parallel, is connected respectively with each phase cable of alter-parallel
Flow sensor, including A phase shielded layer current sensor, B phase shielded layer current sensor and C phase shielded layer current sensor,
These current sensors may be provided at the joint of each cable, further include the current sense being connected with shielding layer grounding end
Device, and the current sensor being connected with cable main push-towing rope, the system further include the cable screens being connected with above each current sensor
Covering layer monitoring is device, which may be above-mentioned cable shield failure determination device, the device by communication system with
Monitoring center is connected, the device by communication system can be used GPRS (General Packet Radio Service, general point
Group wireless service technology) or 4G network to monitoring center send data, for example, what cable shield monitoring device can will test
The current data of shielded layer is transmitted to monitoring center by communication system, allows electricity of the monitoring center by cable shield
Rheology obtains the state of cable shield, meets with as short trouble, disconnection fault or shielded layer insulation occur for cable shield
It is damaged and weak discharge failure occurs, monitoring center can also show the fault message of cable shield appearance, or can be by event
Barrier information is distributed to terminal device, in order to which operation maintenance personnel checks fault message in time, thus in time to the event of cable shield
Barrier is handled.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.
In addition, to simplify explanation and discussing, and in order not to obscure the invention, it can in provided attached drawing
It is connect with showing or can not show with the well known power ground of integrated circuit (IC) chip and other components.Furthermore, it is possible to
Device is shown in block diagram form, to avoid obscuring the invention, and this has also contemplated following facts, i.e., about this
The details of the embodiment of a little block diagram arrangements be height depend on will implementing platform of the invention (that is, these details should
It is completely within the scope of the understanding of those skilled in the art).Elaborating that detail (for example, circuit) is of the invention to describe
In the case where exemplary embodiment, it will be apparent to those skilled in the art that can be in these no details
In the case where or implement the present invention in the case that these details change.Therefore, these descriptions should be considered as explanation
Property rather than it is restrictive.
Although having been incorporated with specific embodiments of the present invention, invention has been described, according to retouching for front
It states, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.Example
Such as, discussed embodiment can be used in other memory architectures (for example, dynamic ram (DRAM)).
The embodiment of the present invention be intended to cover fall into all such replacements within the broad range of appended claims,
Modifications and variations.Therefore, all within the spirits and principles of the present invention, any omission, modification, equivalent replacement, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of cable shield fault determination method, which is characterized in that the ground terminal of the cable shield and ungrounded end
Circuit is constituted by first-grade protection circuit, is provided with current sensor on the circuit, which comprises
Receive the current data at the collected ground terminal of the current sensor and the ungrounded end；
Determine that the state of the cable shield, the state of the cable shield include at least following according to the current data
It is a kind of:
The cable shield short circuit, cable shield broken string and cable shield electric leakage.
2. the method according to claim 1, wherein determining the shielded layer of the cable according to the current data
State, comprising:
The difference of the current value of the ground terminal described in the current data received twice in succession determines when being greater than first threshold
The cable shield short circuit；
Alternatively, the difference of the current value of ground terminal described in the current data that ought be received twice in succession be greater than first threshold and
The current value at the ungrounded end level off to zero when, determine cable shield short circuit.
3. the method according to claim 1, wherein determining the shielded layer of the cable according to the current data
State, comprising:
The electric current of the ground terminal described in the current data received and the electric current at the ungrounded end are less than the second threshold
When value, the cable shield broken string is determined.
4. the method according to claim 1, wherein determining the shielded layer of the cable according to the current data
State, comprising:
The current value of the ground terminal described in the current data received and the difference of default operating current are greater than third threshold value,
And/or the electric current at ungrounded end described in the current data received and the difference of the default operating current are less than described
When third threshold value, the cable shield electric leakage is determined.
5. method according to any one of claims 1 to 4, which is characterized in that the first-grade protection circuit includes at least electricity
Container.
6. a kind of cable shield failure determination device, which is characterized in that the ground terminal of the cable shield and ungrounded end
Circuit is constituted by first-grade protection circuit, is provided with current sensor on the circuit, described device includes:
Receiving module, for receiving the electric current number of the collected ground terminal of the current sensor and the ungrounded end
According to；
Determining module, for determining the state of the cable shield, the shape of the cable shield according to the current data
State includes at least following one kind:
The cable shield short circuit, cable shield broken string and cable shield electric leakage.
7. device according to claim 6, which is characterized in that the determining module is used for:
The difference of the current value of the ground terminal described in the current data received twice in succession determines when being greater than first threshold
The cable shield short circuit；
Alternatively, the difference of the current value of ground terminal described in the current data that ought be received twice in succession is greater than first threshold
The current value at value and the ungrounded end level off to zero when, determine cable shield short circuit.
8. device according to claim 6, which is characterized in that the determining module is used for:
The electric current of the ground terminal described in the current data received and the electric current at the ungrounded end are less than the second threshold
When value, the cable shield broken string is determined.
9. a kind of electronic equipment including memory, processor and stores the calculating that can be run on a memory and on a processor
Machine program, which is characterized in that the processor realizes such as cable described in any one of claim 1 to 5 when executing described program
Shielded layer fault determination method.
10. a kind of non-transient computer readable storage medium, which is characterized in that the non-transient computer readable storage medium is deposited
Computer instruction is stored up, the computer instruction is used to that the computer perform claim to be made to require 1 to 5 any cable shield
Layer fault determination method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910278243.4A CN110045238A (en) | 2019-04-09 | 2019-04-09 | Cable shield fault determination method, device, equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910278243.4A CN110045238A (en) | 2019-04-09 | 2019-04-09 | Cable shield fault determination method, device, equipment and storage medium |
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| CN110045238A true CN110045238A (en) | 2019-07-23 |
Family
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| CN201910278243.4A Pending CN110045238A (en) | 2019-04-09 | 2019-04-09 | Cable shield fault determination method, device, equipment and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113779878A (en) * | 2021-09-06 | 2021-12-10 | 山东大学 | Parameter optimization method and system for single-core cable shielding layer damping discharge grounding device |
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| CN104678257A (en) * | 2015-02-08 | 2015-06-03 | 云南酷联科技有限公司 | Method for positioning faults of high voltage single-core cable protective layer accurately |
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