CN109035659B - Anti-theft cutting monitoring method and device for high-voltage power cable - Google Patents
Anti-theft cutting monitoring method and device for high-voltage power cable Download PDFInfo
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Abstract
The invention relates to a high-voltage power cable anti-theft cutting monitoring method and a device, which are used for collecting switch input quantity, sheath current and load current and judging whether a cable is cut or not according to the switch input quantity, the sheath current and the load current. The invention integrates the state change condition of the switch input quantity, the sheath current analog quantity information and the load current analog quantity information, adopts a method of combining the variable quantity and the steady-state quantity, has the characteristics of high judging accuracy, good reliability and simple implementation, improves the positive judging rate of the power cable cutting early warning, and improves the intelligent level of the power cable operation and maintenance.
Description
Technical Field
The invention belongs to the technical field of operation of power transmission and transformation equipment, and particularly relates to a method and a device for monitoring anti-theft cutting of a high-voltage power cable.
Background
With the deep promotion of urbanization construction in China, the power cable becomes the main artery of urban power transmission and plays a crucial role in the power supply safety of the whole city. In the real life, because the power piping lane or the cable pit unmanned on duty of installation high voltage power cable, the phenomenon that the grounding body conductor of high voltage power cable metal protective sheath is cut or destroyed by the people often takes place, brings hidden danger and risk for power equipment safe operation.
Based on the requirements of power cables and channels for operation and maintenance, the power cable body online monitoring in engineering application usually adopts some state sensing technical means to monitor the power cable cutting situation, provides real-time monitoring and alarming, and plays an active role in reducing power cable cutting and maintaining safe operation of the power cable.
At present, the method for monitoring the stealing and cutting of the cable in engineering application mainly comprises the following steps:
1. the vibration quantity generated when the cable is stolen and cut by adopting the vibration sensor is monitored, the method is mainly characterized in that the vibration sensor is installed at the conductor part of the grounding body of the metal protective sleeve of the cable, three single-roller vibration switches are arranged in the vibration sensor, every two vibration switches are perpendicular to each other, when a part to be detected is kept in a static state, the vibration sensor can be ensured to be in a closed state when being installed in any direction, when the part to be detected generates vibration, the vibration sensor can be instantly disconnected, and the instant peak value of voltage appears in a background monitoring system, so that the part to be detected is judged to be vibrated. The method needs pattern recognition based on the vibration characteristics during stealing and cutting, has a complex algorithm and certain misjudgment possibility, and has high requirements on field installation and debugging.
2. The cable stealing and cutting monitoring method adopting the switch input amount judgment is characterized in that a metal thin wire is wound on a conductor part of a grounding body of a cable metal protective sleeve, the switch input amount is in a conducting state under normal conditions, once the part is cut off, the metal thin wire is inevitably cut off, and the switch input amount is in a disconnecting state, so that the situation that the part to be detected is stolen and cut is judged. The method only judges the input quantity, the algorithm is very simple, but when the input loop is abnormal, the possibility that judgment cannot be carried out or misjudgment is carried out often occurs.
Disclosure of Invention
The invention aims to provide a method and a device for monitoring anti-theft cutting of a high-voltage power cable, which are used for solving the problem of high misjudgment rate caused by the fact that an algorithm is complex when a vibration sensor is used for monitoring vibration quantity generated during the stealing cutting of the cable or only a switch input quantity is judged.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a high-voltage power cable anti-theft cutting monitoring method, which comprises the following steps:
collecting switch input quantity, sheath current and load current, and judging whether the cable is cut by theft according to the switch input quantity, the sheath current and the load current; when the switch input quantity is changed from a closed state to an open state, the real-time value of any one phase sheath current is smaller than a set sheath no-current threshold value and the real-time value of the load current is larger than a set load no-current threshold value, or when the switch input quantity is changed from the closed state to the open state and the real-time values of the three-phase sheath current are both smaller than the set sheath no-current threshold value and the real-time value of the load current is smaller than the set load no-current threshold value, or when the variation of any one phase sheath current is larger than or equal to the set variation threshold value and the real-time value of the sheath current is smaller than the set sheath no-current threshold value and the real-time value of the load; wherein the set load no-flow threshold is less than or equal to the set load flow threshold.
The invention also provides a high-voltage power cable anti-theft cutting monitoring device, which comprises a processor, wherein the processor is used for executing the instructions to realize the following method:
collecting switch input quantity, sheath current and load current, and judging whether the cable is cut by theft according to the switch input quantity, the sheath current and the load current; when the switch input quantity is changed from a closed state to an open state, the real-time value of any one phase sheath current is smaller than a set sheath no-current threshold value and the real-time value of the load current is larger than a set load no-current threshold value, or when the switch input quantity is changed from the closed state to the open state and the real-time values of the three-phase sheath current are both smaller than the set sheath no-current threshold value and the real-time value of the load current is smaller than the set load no-current threshold value, or when the variation of any one phase sheath current is larger than or equal to the set variation threshold value and the real-time value of the sheath current is smaller than the set sheath no-current threshold value and the real-time value of the load; wherein the set load no-flow threshold is less than or equal to the set load flow threshold.
The invention has the beneficial effects that:
the invention integrates the switch input quantity, the sheath current analog quantity information and the load current analog quantity information, adopts a method of combining the variable quantity and the steady-state quantity to judge whether the power cable is cut by theft, has the characteristics of high judging accuracy, good reliability and simple implementation, improves the judging rate of the power cable theft early warning, and improves the intelligent level of the power cable operation and maintenance.
As a further improvement of the method and the device, in order to further determine whether the state of the switch input quantity is normal, when the real-time state of the switch input quantity is an off state and the real-time values of the three-phase sheath current are all greater than the set sheath current threshold, the state of the switch input quantity is determined to be abnormal; and setting the sheath no-flow threshold value to be less than or equal to the sheath flow threshold value. Possess the cable and steal to cut into return circuit state self-checking and unusual alarm function, be favorable to promoting the intelligent level of cable fortune dimension.
As a further improvement of the method and the device, in order to realize early warning, when the switch input quantity is changed from a closed state to an open state, the real-time value of the current of any phase of sheath is smaller than a set sheath no-current threshold value, and the real-time value of the load current is larger than a set load current threshold value, cable cutting early warning is carried out through first set delay time; when the switch input quantity is changed from a closed state to an open state, the real-time value of the three-phase sheath current is smaller than the set sheath no-current threshold value, and the real-time value of the load current is smaller than the set load no-current threshold value, cable cutting early warning is carried out through second set delay time; when the variation of the current of any phase sheath is more than or equal to a set variation threshold value, the real-time value of the current of the phase sheath is less than a set sheath no-current threshold value, and the real-time value of the load current is more than a set load current threshold value, cable cutting early warning is carried out through third set delay time; and when the real-time state of the switch input quantity is an off state and the real-time values of the three-phase sheath current are all larger than the set sheath current threshold value, performing abnormal alarm on the state of the switch input quantity through a fourth set delay time.
As a further improvement of the method and the device, in order to reflect the alarm accuracy, the first set delay time is less than the second set delay time, the first set delay time is less than the third set delay time, and the first set delay time is less than the fourth set delay time.
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FIG. 1 is a block diagram of the logical decision of anti-skimming monitoring of the present invention;
fig. 2 is a logic block diagram for judging an input quantity abnormality of the anti-theft cut-off switch of the present invention.
Detailed Description
The invention provides a high-voltage power cable anti-theft cutting monitoring device which comprises a processor, wherein the processor is used for executing instructions to realize the high-voltage power cable anti-theft cutting monitoring method. The method is further described in detail below with reference to the figures and examples.
Firstly, an anti-theft cut-in signal, sheath current and load current are collected.
1. Cable cutting theft judgment based on anti-theft cutting-in signal
The anti-theft cut-in signal is the input quantity of the switch. The metal thin wire is wound at the grounding conductor part of the cable metal protective sleeve, and the anti-theft cut-in signal is in a closed state (logic '1' state, recorded as K) under the normal conditionr1); when the portion is cut off, the thin metal wire is generally cut off, and the antitheft cut-in signal is turned off (logic "0" state, denoted as K)r0). Therefore, the possibility of stealing and cutting the part to be measured can be judged according to the state change condition of the anti-theft cutting-in signal. When the anti-theft cutting-in signal is changed from a closed state to an open state (from a logic 1 state to a logic 0 state), the cutting-in state is considered to be correspondingly changed and is recorded as delta Kr1. Since the open-loop abnormity (such as open-loop disconnection, power supply abnormity or photoelectric isolation) can also cause the open-loop information to be inconsistent with the actual working condition, the switch input quantity state criterion in the method is combined with other criteria for use.
2. Cable cutting-stealing judgment based on sheath current
When a load current exists in the cable, a voltage is induced in the cable sheath, and a sheath current I is formedhc(ii) a When a certain section of the cable sheath is cut, the sheath current disappears because the current loop is disconnected. By monitoring the change of the sheath current, the disappearance of the sheath current can be used as one of effective criteria for stealing and cutting the cable. Moreover, the high-voltage power cable is provided with the sheath current monitoring sensor in engineering application, so that the scheme does not need to increase any hardware cost, only needs to increase corresponding functions in a software module, and is simple in engineering implementation.
3. Cable cutting stealing judgment based on load current
The power cable load monitoring is mainly used as an auxiliary criterion for monitoring the sheath current, the sheath current of the cable is generated by the load current, and therefore the load current is introduced to be used as the inspection of the running condition of the cable, such as identifying whether the cable is in a commissioning state or whether the cable is in an idle state. When the load current IfhWhen the current is 0, the cable is not in operation or in power failure maintenance state, and the sheath current I is at the momenthcThe criterion that the cable is cut by theft cannot be used; similarly, when the cable is in an unloaded state, the load current IfhVery small, induced sheath current IhcAnd the small cable cannot be used as a criterion for the cable to be cut by theft. In addition, the high-voltage cable is also provided with a load current monitoring sensor in practical engineering application, so that no hardware is required to be added by adopting the scheme, only corresponding functions are required to be added in a software module, and the engineering implementation is simple.
Then, as shown in fig. 1, a multi-criterion correlation determination method is adopted, i.e. whether the cable is cut or not is determined according to the switch input quantity, the sheath current and the load current.
1. Situation 1
When the switch input quantity is changed from a closed state to an open state, the current of any phase sheath is zero and the load current exists, the fact that the cable is cut is determined. Since the sheath current may be small and not zero in the actual detection process, it is determined whether the sheath current is zero by determining whether the sheath current is smaller than the set sheath no-current threshold. Here, whether or not the load current is present is determined by determining whether or not the load current is greater than a set load current threshold value. Namely:
wherein, Δ KrWhen the opening signal changes from a closed state to an open state (changes from logic '1' to logic '0'), marking as 1; i ishc.φFor any phase of sheath current, IhcxsetIn order to set a sheath no-current threshold value, the smaller sheath current is used as the reflection of the stealing and cutting phenomenon on the sheath current; i isfhFor load current, IfhdsetTo set the threshold of the current flow of the load, Ifh＞IfhdsetAs a supplementary criterion, it indicates the presence of load current.
When the three conditions are all satisfied, after a short time t1, a signal of 'cable cutting early warning' is given. The method takes the variable quantity of the disappearance of the anti-theft cutting-in signal as the trigger, combines the magnitude of the steady state quantity of the current of the sheath layer to judge, and mainly realizes the quick alarm of the theft and the cutting of the cable during the current flowing.
2. Situation 2
And when the switch input quantity is changed from a closed state to an open state, the three-phase sheath current is zero and the load current does not exist, determining that the cable is cut by theft. Since the three-phase sheath current may be small and not zero in the actual detection process, it is determined whether the three-phase sheath current is zero by determining whether the three-phase sheath current is smaller than the set sheath no-current threshold. Here, whether or not the load current is not present is determined by determining whether or not the load current is smaller than a set load no-current threshold. Namely:
wherein, Δ KrWhen the opening signal changes from a closed state to an open state (changes from logic '1' to logic '0'), marking as 1; i ishcIs a three-phase sheath current, IhcxsetTo set the sheath no-current threshold, Ihc＜IhcxsetAs a criterion, the three-phase sheath current is zero and is used as the reflection of the stealing and cutting phenomenon on the sheath current; i isfhFor load current, IfhxsetTo set the load no-flow threshold, Ifh＜IfhxsetAs a supplementary criterion, the state that the cable line is not put into operation or is unloaded is represented.
When the three conditions are all met, after a long time t2, a signal of 'cable cutting early warning' is given. The method takes the variable quantity of the disappearance of the anti-theft cutting-in signal as the trigger, combines the magnitude of the steady state quantity of the current of the sheath layer to judge, and mainly realizes the long-time delay alarm of the cable cutting in the non-current or control process.
3. Condition 3
When any phase sheath current disappears and the load current exists, the cable is determined to be cut by theft. If the current of any phase sheath is large at a moment before the current of the phase sheath and is small at the current moment, namely the current of any phase sheath is large in variation and is small at the current moment, the disappearance of the current of the phase sheath is judged. Here, whether the load current exists is judged by judging whether the load current is larger than a set load current threshold value. Namely:
wherein, Delta IhcThe current variation of any phase sheath is obtained by subtracting the current value of the sheath at the current moment from the current value of the sheath at the previous moment, and when the value is larger than or equal to the set variation threshold value delta IsetWhen the current is higher, the current of the protective layer is reduced greatly; i ishcxsetTo set the sheath no-current threshold, IfhdsetThere is a flow threshold for setting the load.
Under the condition that the three conditions are simultaneously met, after a long time t3, a signal of 'cable stealing and cutting early warning' is given. The method takes the variable quantity of the disappearance of the sheath current as trigger and combines the magnitude of the steady-state quantity of the load current to judge, and mainly realizes that the cable cutting alarm can be given even if the input quantity of the switch is invalid.
In addition, the method also provides a method for judging whether the switch input quantity is abnormal or not, and a logic judgment diagram is shown in fig. 2.
And collecting the real-time state of the switch input quantity and the real-time value of the sheath current, and judging that the state of the switch input quantity is abnormal when the real-time state of the switch input quantity is an off state and the real-time values of the three-phase sheath current are all larger than a set sheath current threshold value. Namely:
wherein, KrFor switching input quantity, IhcFor three phases of protectionLayer current, IhcdsetTo set the sheath to have a flow threshold.
When sheath current is present and normal, the switch input should be 1. If the switching input amount is 0, the switching input amount is basically considered to be abnormal. And when the two conditions are met, giving an 'anti-theft cut-in signal abnormal alarm' signal after a long time t 4.
In the above-described criteria, the set load no-flow threshold is equal to or less than the set load flow threshold, and the set sheath no-flow threshold is equal to or less than the set sheath flow threshold. Moreover, among the plurality of delay times described above, the short time t1 is smaller than the long times t2, t3, and t 4.
The invention integrates switching value input, sheath current analog quantity information and load current analog quantity information, adopts a variable quantity and steady-state quantity combined judging method, and has the characteristics of high judging accuracy, good reliability and simple implementation; the invention not only can improve the positive judgment rate of the early warning of the stealing and cutting of the power cable, but also has the functions of self-checking and abnormal warning of the state of the cable in a circuit after the cable is stolen and cut, and is beneficial to improving the intelligent level of the operation and maintenance of the cable.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (8)
1. A high-voltage power cable anti-theft cutting monitoring method is characterized by comprising the following steps:
collecting switch input quantity, sheath current and load current, and judging whether the cable is cut by theft according to the switch input quantity, the sheath current and the load current;
when the switch input quantity is changed from a closed state to an open state, the real-time value of any one phase sheath current is smaller than a set sheath no-current threshold value and the real-time value of the load current is larger than a set load no-current threshold value, or when the switch input quantity is changed from the closed state to the open state and the real-time values of the three-phase sheath current are both smaller than the set sheath no-current threshold value and the real-time value of the load current is smaller than the set load no-current threshold value, or when the variation of any one phase sheath current is larger than or equal to the set variation threshold value and the real-time value of the sheath current is smaller than the set sheath no-current threshold value and the real-time value of the load; wherein the set load no-flow threshold is less than or equal to the set load flow threshold.
2. The anti-skiving monitoring method for high voltage power cable according to claim 1, wherein when the real-time status of the switch input is off and the real-time values of the three-phase sheath current are all greater than the set sheath current threshold, the status of the switch input is determined to be abnormal; and setting the sheath no-flow threshold value to be less than or equal to the sheath flow threshold value.
3. The method according to claim 2, wherein when the switch input is changed from the closed state to the open state and the real-time value of the sheath current of any phase is smaller than the set sheath no-current threshold and the real-time value of the load current is greater than the set load current threshold, the cable cutting-stealing warning is performed after the first set delay time;
when the switch input quantity is changed from a closed state to an open state, the real-time value of the three-phase sheath current is smaller than the set sheath no-current threshold value, and the real-time value of the load current is smaller than the set load no-current threshold value, cable cutting early warning is carried out through second set delay time;
when the variation of the current of any phase sheath is more than or equal to a set variation threshold value, the real-time value of the current of the phase sheath is less than a set sheath no-current threshold value, and the real-time value of the load current is more than a set load current threshold value, cable cutting early warning is carried out through third set delay time;
and when the real-time state of the switch input quantity is an off state and the real-time values of the three-phase sheath current are all larger than the set sheath current threshold value, performing abnormal alarm on the state of the switch input quantity through a fourth set delay time.
4. The anti-skiving monitoring method for high voltage power cable according to claim 3, wherein the first set delay time is less than the second set delay time, the first set delay time is less than the third set delay time, and the first set delay time is less than the fourth set delay time.
5. The anti-theft cutting monitoring device for the high-voltage power cable is characterized by comprising a processor, wherein the processor is used for executing instructions to realize the following method:
collecting switch input quantity, sheath current and load current, and judging whether the cable is cut by theft according to the switch input quantity, the sheath current and the load current;
when the switch input quantity is changed from a closed state to an open state, the real-time value of any one phase sheath current is smaller than a set sheath no-current threshold value and the real-time value of the load current is larger than a set load no-current threshold value, or when the switch input quantity is changed from the closed state to the open state and the real-time values of the three-phase sheath current are both smaller than the set sheath no-current threshold value and the real-time value of the load current is smaller than the set load no-current threshold value, or when the variation of any one phase sheath current is larger than or equal to the set variation threshold value and the real-time value of the sheath current is smaller than the set sheath no-current threshold value and the real-time value of the load; wherein the set load no-flow threshold is less than or equal to the set load flow threshold.
6. The apparatus according to claim 5, wherein when the real-time status of the switch input is off and the real-time values of the three-phase sheath current are all greater than the set sheath current threshold, the status of the switch input is determined to be abnormal; and setting the sheath no-flow threshold value to be less than or equal to the sheath flow threshold value.
7. The apparatus according to claim 6, wherein when the switch input is changed from the closed state to the open state and the real-time value of the sheath current of any phase is smaller than the set sheath no-current threshold and the real-time value of the load current is larger than the set load current threshold, the apparatus performs the cable cutting warning after the first set delay time;
when the switch input quantity is changed from a closed state to an open state, the real-time value of the three-phase sheath current is smaller than the set sheath no-current threshold value, and the real-time value of the load current is smaller than the set load no-current threshold value, cable cutting early warning is carried out through second set delay time;
when the variation of the current of any phase sheath is more than or equal to a set variation threshold value, the real-time value of the current of the phase sheath is less than a set sheath no-current threshold value, and the real-time value of the load current is more than a set load current threshold value, cable cutting early warning is carried out through third set delay time;
and when the real-time state of the switch input quantity is an off state and the real-time values of the three-phase sheath current are all larger than the set sheath current threshold value, performing abnormal alarm on the state of the switch input quantity through a fourth set delay time.
8. The apparatus according to claim 7, wherein the first set delay time is less than the second set delay time, the first set delay time is less than the third set delay time, and the first set delay time is less than the fourth set delay time.
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| CN109035659A (en) | 2018-12-18 |
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