CN109035659A - A kind of high voltage power cable anti-theft monitoring method and device - Google Patents
A kind of high voltage power cable anti-theft monitoring method and device Download PDFInfo
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- CN109035659A CN109035659A CN201810983641.1A CN201810983641A CN109035659A CN 109035659 A CN109035659 A CN 109035659A CN 201810983641 A CN201810983641 A CN 201810983641A CN 109035659 A CN109035659 A CN 109035659A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Burglar Alarm Systems (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of high voltage power cable anti-theft monitoring method and device, acquisition switch input quantity, circulating current and load currents, according to switch input quantity, circulating current and load current, to judge whether cable is cut.The present invention merges state change situation, circulating current analog quantity information and the load current analog quantity information of switch input quantity, the method combined using variable quantity and steady-state quantity, have and differentiates high accuracy rate, good reliability and implement simple feature, it improves power cable and steals the right judging rate for cutting early warning, improve the intelligent level of power cable O&M.
Description
Technical field
The invention belongs to power transmission and transformation equipment operation technical fields, and in particular to a kind of high voltage power cable anti-theft monitoring side
Method and device.
Background technique
With the deep propulsion of China's Urbanization Construction, power cable has become the aorta of urban electric power conveying, to whole
The power supply safety in a city plays the role of vital.In actual life, due to installing the electric power piping lane of high voltage power cable
Or cable duct left unguarded, the grounding body conductor of high voltage power cable metal protection protector is cut or is destroyed by artificial robber frequent occurrence
Phenomenon brings hidden danger and risk to power equipment safety operation.
Requirement based on power cable and channel operation and maintenance, power cable ontology on-line monitoring is often adopted in engineer application
It takes some state aware technological means to carry out monitoring power cable to be cut situation, real-time monitoring and alarm is provided, to reducing electric power
Cable is cut, positive effect is played in maintenance cable safe operation.
Monitored in engineer application at present cable steal the method cut mainly include the following types:
1, the vibratory output generated when cable being stolen and cut using vibrating sensor is monitored, and this method is mainly in cable
Vibrating sensor is installed at the grounding body conductor position of metal protection protector, setting three single roller bearing vibroswitches in vibrating sensor,
And vibroswitch is mutually perpendicular to two-by-two, when the parts to be tested remain stationary state, above-mentioned vibrating sensor can be guaranteed any
Closed state is in when direction form is installed, and when the parts to be tested generates vibration, above-mentioned vibrating sensor can be made instantaneously to break
It opens, occurs the instantaneous peak value of voltage in background monitoring system, to judge that the parts to be tested is vibrated.This method needs base
Vibration performance carries out pattern-recognition when robber cuts, and algorithm is complex and there is a possibility that centainly to judge by accident, furthermore to in-site installation
It is more demanding with debugging.
2, the cable robber differentiated using switch input quantity cuts monitoring method, grounding body of this method in cable metal protective case
Conductor position winds metal fine, and normal condition lower switch input quantity is on state, once when the position is cut off, metal
Filament is necessarily cut off, and switch input quantity is off-state, to judge that the parts to be tested has occurred robber and cuts.This method is only split
Enter amount to be differentiated, algorithm very simple, but when open entry loop is abnormal, often occur can not differentiate or judge by accident can
It can property.
Summary of the invention
The purpose of the present invention is to provide a kind of high voltage power cable anti-theft monitoring method and devices, use to solve
Vibrating sensor cable is stolen when the vibratory output that generates is monitored when cutting using algorithm it is complicated or only to switch input quantity into
The high problem of False Rate caused by when row judges.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The present invention provides a kind of high voltage power cable anti-theft monitoring methods, include the following steps:
Acquisition switch input quantity, circulating current and load current, according to switch input quantity, circulating current and load current,
To judge whether cable is cut；When switch input quantity by closed state go off state, any phase circulating current it is real-time
When real value of the value less than setting sheath without stream threshold value and load current has stream threshold value greater than assumed load, or work as switch input
Amount goes off state by closed state, the real value of three-phase circulating current is respectively less than and sets sheath without stream threshold value and load current
Real value be less than assumed load without stream threshold value when, or when any phase circulating current variable quantity be more than or equal to setting variable quantity
Threshold value, the real value of the phase circulating current have without the real value of stream threshold value and load current greater than assumed load less than setting sheath
When flowing threshold value, determine that cable is cut；Wherein, assumed load, which is less than or equal to assumed load without stream threshold value, stream threshold value.
The present invention also provides a kind of high voltage power cable anti-theft monitoring device, including processor, the processor is used
Following method is realized in executing instruction:
Acquisition switch input quantity, circulating current and load current, according to switch input quantity, circulating current and load current,
To judge whether cable is cut；When switch input quantity by closed state go off state, any phase circulating current it is real-time
When real value of the value less than setting sheath without stream threshold value and load current has stream threshold value greater than assumed load, or work as switch input
Amount goes off state by closed state, the real value of three-phase circulating current is respectively less than and sets sheath without stream threshold value and load current
Real value be less than assumed load without stream threshold value when, or when any phase circulating current variable quantity be more than or equal to setting variable quantity
Threshold value, the real value of the phase circulating current have without the real value of stream threshold value and load current greater than assumed load less than setting sheath
When flowing threshold value, determine that cable is cut；Wherein, assumed load, which is less than or equal to assumed load without stream threshold value, stream threshold value.
Beneficial effects of the present invention:
The present invention merges switch input quantity, circulating current analog quantity information and load current analog quantity information, using variation
The method that amount and steady-state quantity combine has to judge whether power cable is cut and differentiates accuracy rate height, reliability
Well and implement simple feature, improves power cable and steal the right judging rate for cutting early warning, improve the intelligence of power cable O&M
It is horizontal.
As the further improvement of method and device, whether the state in order to further determine switch input quantity is normal, when
The real-time status of switch input quantity, which is all larger than setting sheath for the real value of off-state and three-phase circulating current, stream threshold value, really
Surely it is abnormal for switching the state of input quantity；Setting sheath, which is less than or equal to setting sheath without stream threshold value, stream threshold value.Has cable robber
The self-test of entry loop state and abnormality alarming function are cut open, the intelligent level for promoting cable O&M is conducive to.
As the further improvement of method and device, in order to realize early warning, when switch input quantity becomes disconnected from closed state
It is negative greater than setting that open state, the real value of any phase circulating current are less than real value of the setting sheath without stream threshold value and load current
When lotus has stream threshold value, through the first setting delay time, carries out cable robber and cut early warning；When switch input quantity becomes disconnected from closed state
It is negative less than setting that open state, the real value of three-phase circulating current are respectively less than real value of the setting sheath without stream threshold value and load current
When lotus is without stream threshold value, through the second setting delay time, carries out cable robber and cut early warning；When the variable quantity of any phase circulating current is greater than
It is less than real value of the setting sheath without stream threshold value and load current equal to setting variable quantity threshold value, the real value of the phase circulating current
When having stream threshold value greater than assumed load, delay time is set through third, cable robber is carried out and cuts early warning；When switch input quantity it is real-time
When state is that the real value of off-state and three-phase circulating current both greater than sets sheath and has stream threshold value, when being delayed through the 4th setting
Between, carry out switch input quantity abnormal state alarm.
As the further improvement of method and device, in order to reflect alarm accuracy rate, the first setting delay time is small
Delay time is set in second, the first setting delay time is less than third and sets delay time, the first setting delay
Time is less than the 4th setting delay time.
Detailed description of the invention
Fig. 1 is the logic judgment block diagram of anti-theft monitoring of the invention；
Fig. 2 is the logic judgment block diagram of anti-theft switch input quantity exception of the invention.
Specific embodiment
The present invention provides a kind of high voltage power cable anti-theft monitoring device, which includes processor, the processor
High voltage power cable anti-theft monitoring method of the invention is realized for executing instruction.With reference to the accompanying drawings and examples, to this
Method is described in further detail.
It cuts open firstly, acquisition is antitheft into signal, circulating current and load current.
1, differentiate that cable is cut into signal based on antitheft cut open
It is antitheft to cut open into signal, i.e. switch input quantity.At the earth conductor position of cable metal protective case, winding metal is thin
Line, antitheft cut open into signal is that (logical one state, is denoted as K to closed state under normal circumstancesr=1)；Once the position is cut
It removes, metal fine generally can also be cut off, and antitheft at this time cut open goes off state into signal (logical zero state, is denoted as Kr=
0).Therefore it can determine whether that the parts to be tested may have occurred robber and cut according to the antitheft state change situation cut open into signal.It is cut open when antitheft
Entering signal by closed state variation is off-state (being logical zero state by logical one state change), then it is assumed that is opened into state
Corresponding change has occurred, is denoted as Δ Kr=1.Due to open entry loop it is abnormal (such as open into broken string, open into abnormity of power supply or photoelectricity every
From) may also lead to open and be not inconsistent into information and actual condition, therefore input quantity state criterion and other criterions are switched in this method
It is used in combination.
2, differentiate that cable is cut based on circulating current
When there is load current in cable, induction voltage can be generated in cable sheath, and then form circulating current Ihc；When
When cable sheath section is cut, since current loop is disconnected, circulating current can disappear.By monitoring this change of circulating current
Change, circulating current can be disappeared as cable and steal one of the effective criterion cut.Moreover, engineer application middle-high voltage power cable is
It is configured circulating current monitoring sensor, therefore is not required to increase any hardware cost using this scheme, it only need to be in software module
Middle increase corresponding function, engineering construction are simple.
3, differentiate that cable is cut based on load current
The assistant criteria that power cable load monitoring is monitored mainly as circulating current, cable sheath electric current are by load electricity
Miscarriage is raw, therefore introduces inspection of the load current as cable operation conditions, such as identification cable whether be in the state of putting into operation or
Whether person's cable is in light condition.As load current IfhWhen=0, general cable is in the state or in interruption maintenance of not putting into operation
State, circulating current I at this timehcIt cannot function as the criterion that cable is cut；Equally, when cable is in light condition, load electricity
Flow IfhVery little, the circulating current I inducedhcVery little, can not be as the criterion that cable is cut.Moreover, practical engineering application
Intermediate High Pressure cable also configuration load current monitoring sensor, therefore be not required to increase any hardware using this scheme, only
Corresponding function need to be increased in software module, engineering construction is simple.
Then, as shown in Figure 1, being associated with method of discrimination using more criterions, i.e., according to switch input quantity, circulating current and load
Electric current, to judge whether cable is cut.
1, situation 1
When switch input quantity goes off state by closed state, any phase circulating current is zero and load current exists
When, determine that cable is cut.It will not be zero since circulating current may be smaller during atual detection, therefore here by sentencing
Whether disconnected circulating current is less than setting sheath without stream threshold value to judge whether circulating current is zero.Moreover, negative by judgement here
Whether charged current, which is greater than assumed load, has stream threshold value to judge that load current whether there is.That is:
Wherein, Δ KrCut open to be antitheft into change amount signal, when this open into signal by closed state variation off-state (by
Logical one changes to logical zero), it is denoted as 1；Ihc.φFor any phase circulating current, IhcxsetIt is setting sheath without stream threshold value, will protects
Layer electric current it is smaller as robber cut reflection of the phenomenon on circulating current；IfhFor load current, IfhdsetThere is stream threshold for assumed load
Value, Ifh> IfhdsetAs supplement criterion, indicate that load current exists.
It in the case that above three condition is all satisfied, is delayed after short time t1, provides " cable robber cuts early warning " signal.It should
Method cuts open the variable quantity into blackout with antitheft as triggering, is differentiated in conjunction with circulating current steady-state quantity size, mainly
Realizing has cable robber when stream to cut quick alarm.
2, situation 2
When switch input quantity goes off state by closed state, three-phase circulating current is zero and load current is not present
When, determine that cable is cut.Since three-phase circulating current may be smaller during atual detection, it will not be zero, therefore lead to here
It crosses and judges whether three-phase circulating current is respectively less than setting sheath without stream threshold value to judge whether three-phase circulating current is zero.Moreover,
Here judge whether load current is not present without stream threshold value by judging whether load current is less than assumed load.That is:
Wherein, Δ KrCut open to be antitheft into change amount signal, when this open into signal by closed state variation off-state (by
Logical one changes to logical zero), it is denoted as 1；IhcFor three-phase circulating current, IhcxsetIt is setting sheath without stream threshold value, Ihc<
IhcxsetIt as criterion, indicates that three-phase circulating current is zero, cuts reflection of the phenomenon on circulating current as stealing；IfhIt is negative charged
Stream, IfhxsetIt is assumed load without stream threshold value, Ifh< IfhxsetAs supplement criterion, expression cable run does not put into operation or unloaded shape
State.
It in the case that above three condition is all satisfied, is delayed after long-time t2, provides " cable robber cuts early warning " signal.It should
Method cuts open the variable quantity into blackout with antitheft as triggering, is differentiated in conjunction with circulating current steady-state quantity size, mainly
Realize that the cable robber without stream or when control cuts long delay alarm.
3, situation 3
In the presence of the disappearance of any phase circulating current and load current, determine that cable is cut.If any phase circulating current
The electric current at certain moment is very big before, and to current time very little, that is, any phase circulating current variable quantity it is very big and
Current time circulating current but very little determines that the phase circulating current disappears.Here by judging whether load current is greater than setting
Load has stream threshold value to judge that load current whether there is.That is:
Wherein, Δ IhcFor the variable quantity of any phase circulating current, current time is subtracted for certain former moment circulating current value
Circulating current value, when the value is more than or equal to setting variable quantity threshold value Δ IsetWhen, indicate that circulating current has larger decline；IhcxsetFor
Sheath is set without stream threshold value, IfhdsetThere is stream threshold value for assumed load.
It in the case that above three condition meets simultaneously, is delayed after long-time t3, provides " cable robber cuts early warning " signal.It should
Method is triggering with the variable quantity that circulating current disappears, and is differentiated in conjunction with the size of load current steady-state quantity, even if main realize
Switch input quantity failure can also provide cable robber and cut alarm.
In addition, this method give switch input quantity whether Yi Chang condition discrimination method, logic judgment figure such as Fig. 2 institute
Show.
The real-time status of acquisition switch input quantity and the real value of circulating current, when the real-time status of switch input quantity is disconnected
Open state and the real value of three-phase circulating current, which both greater than set sheath, stream threshold value, judges to switch the state of input quantity to be different
Often.That is:
Wherein, KrTo switch input quantity, IhcFor three-phase circulating current, IhcdsetThere is stream threshold value for setting sheath.
When circulating current all exists and is normal, switch input quantity should be 1.If switching input quantity is 0, can recognize substantially
It is abnormal for switch input quantity.It is provided after long-time t4 after above-mentioned two condition is all satisfied " antitheft to cut open into abnormal signal
Alarm " signal.
In multiple criterions of above-mentioned introduction, assumed load, which is less than or equal to assumed load without stream threshold value, stream threshold value, setting shield
Layer, which is less than or equal to setting sheath without stream threshold value, stream threshold value.Moreover, in multiple delay times of above-mentioned introduction, short time t1 ratio
Long-time t2, long-time t3, long-time t4 are small.
The present invention merges On-off signal, circulating current analog quantity information and load current analog quantity information, using variation
The method of discrimination that amount and steady-state quantity combine has and differentiates high accuracy rate, good reliability and implement simple feature；The present invention is not
But power cable cable can be promoted and steal the right judging rate for cutting early warning, cable robber is also equipped with and cuts open the self-test of entry loop state and abnormality alarming
Function is conducive to the intelligent level for promoting cable O&M.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a kind of high voltage power cable anti-theft monitoring method, which comprises the steps of:
Acquisition switch input quantity, circulating current and load current, according to switch input quantity, circulating current and load current, to sentence
Whether power-off cable is cut；
When switch input quantity goes off state by closed state, the real value of any phase circulating current is less than setting sheath without stream
When threshold value and the real value of load current are greater than assumed load and have stream threshold value, or when switch input quantity becomes disconnected from closed state
It is negative less than setting that open state, the real value of three-phase circulating current are respectively less than real value of the setting sheath without stream threshold value and load current
When lotus is without stream threshold value, or when the variable quantity of any phase circulating current is more than or equal to setting variable quantity threshold value, the phase circulating current
Real value be less than setting sheath without stream threshold value and load current real value be greater than assumed load have stream threshold value when, determine cable
It is cut；Wherein, assumed load, which is less than or equal to assumed load without stream threshold value, stream threshold value.
2. high voltage power cable anti-theft monitoring method according to claim 1, which is characterized in that when switch input quantity
Real-time status, which is all larger than setting sheath for the real value of off-state and three-phase circulating current, stream threshold value, determines switch input quantity
State be abnormal；Setting sheath, which is less than or equal to setting sheath without stream threshold value, stream threshold value.
3. high voltage power cable anti-theft monitoring method according to claim 2, which is characterized in that when switch input quantity by
Closed state goes off state, the real value of any phase circulating current is less than reality of the setting sheath without stream threshold value and load current
When duration has stream threshold value greater than assumed load, through the first setting delay time, carries out cable robber and cuts early warning；
When switch input quantity goes off state by closed state, the real value of three-phase circulating current is respectively less than and sets sheath without stream
When threshold value and the real value of load current are less than assumed load without stream threshold value, through the second setting delay time, carry out cable robber and cut
Early warning；
It is set when the variable quantity of any phase circulating current is less than more than or equal to setting variable quantity threshold value, the real value of the phase circulating current
When determining real value of the sheath without stream threshold value and load current has stream threshold value greater than assumed load, delay time is set through third, into
Row cable robber cuts early warning；
There is stream when the real-time status of switch input quantity is all larger than setting sheath for the real value of off-state and three-phase circulating current
When threshold value, through the 4th setting delay time, switch input quantity abnormal state alarm is carried out.
4. high voltage power cable anti-theft monitoring method according to claim 3, which is characterized in that first setting is prolonged
When the time less than second setting delay time, it is described first setting delay time be less than third set delay time, described first
Delay time is set less than the 4th setting delay time.
5. a kind of high voltage power cable anti-theft monitoring device, which is characterized in that including processor, the processor is for executing
Following method is realized in instruction:
Acquisition switch input quantity, circulating current and load current, according to switch input quantity, circulating current and load current, to sentence
Whether power-off cable is cut；
When switch input quantity goes off state by closed state, the real value of any phase circulating current is less than setting sheath without stream
When threshold value and the real value of load current are greater than assumed load and have stream threshold value, or when switch input quantity becomes disconnected from closed state
It is negative less than setting that open state, the real value of three-phase circulating current are respectively less than real value of the setting sheath without stream threshold value and load current
When lotus is without stream threshold value, or when the variable quantity of any phase circulating current is more than or equal to setting variable quantity threshold value, the phase circulating current
Real value be less than setting sheath without stream threshold value and load current real value be greater than assumed load have stream threshold value when, determine cable
It is cut；Wherein, assumed load, which is less than or equal to assumed load without stream threshold value, stream threshold value.
6. high voltage power cable anti-theft monitoring device according to claim 5, which is characterized in that when switch input quantity
Real-time status, which is all larger than setting sheath for the real value of off-state and three-phase circulating current, stream threshold value, determines switch input quantity
State be abnormal；Setting sheath, which is less than or equal to setting sheath without stream threshold value, stream threshold value.
7. high voltage power cable anti-theft monitoring device according to claim 6, which is characterized in that when switch input quantity by
Closed state goes off state, the real value of any phase circulating current is less than reality of the setting sheath without stream threshold value and load current
When duration has stream threshold value greater than assumed load, through the first setting delay time, carries out cable robber and cuts early warning；
When switch input quantity goes off state by closed state, the real value of three-phase circulating current is respectively less than and sets sheath without stream
When threshold value and the real value of load current are less than assumed load without stream threshold value, through the second setting delay time, carry out cable robber and cut
Early warning；
It is set when the variable quantity of any phase circulating current is less than more than or equal to setting variable quantity threshold value, the real value of the phase circulating current
When determining real value of the sheath without stream threshold value and load current has stream threshold value greater than assumed load, delay time is set through third, into
Row cable robber cuts early warning；
There is stream when the real-time status of switch input quantity is all larger than setting sheath for the real value of off-state and three-phase circulating current
When threshold value, through the 4th setting delay time, switch input quantity abnormal state alarm is carried out.
8. high voltage power cable anti-theft monitoring device according to claim 7, which is characterized in that first setting is prolonged
When the time less than second setting delay time, it is described first setting delay time be less than third set delay time, described first
Delay time is set less than the 4th setting delay time.
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| CN201810983641.1A CN109035659B (en) | 2018-08-27 | 2018-08-27 | Anti-theft cutting monitoring method and device for high-voltage power cable |
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| CN201810983641.1A CN109035659B (en) | 2018-08-27 | 2018-08-27 | Anti-theft cutting monitoring method and device for high-voltage power cable |
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| CN109035659B CN109035659B (en) | 2020-02-21 |
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| CN109035659B (en) | 2020-02-21 |
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