CN117761576A - Leakage fault monitoring device and leakage fault monitoring method in distribution area - Google Patents
Leakage fault monitoring device and leakage fault monitoring method in distribution area Download PDFInfo
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- CN117761576A CN117761576A CN202311774584.3A CN202311774584A CN117761576A CN 117761576 A CN117761576 A CN 117761576A CN 202311774584 A CN202311774584 A CN 202311774584A CN 117761576 A CN117761576 A CN 117761576A
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Abstract
The device comprises a shell, a main control module, a man-machine interaction module, a communication module and a plurality of branch electromagnetic current transformers; the side surface of the shell is provided with a plurality of branch transformer interfaces which are electrically connected with the main control module; the output end of the branch electromagnetic current transformer is a plug-in type connector and is used for being plugged into each branch transformer interface, and the input end of the branch electromagnetic current transformer is an openable annular ring and is used for being respectively sleeved on cables of each subscriber line to be tested; the branch electromagnetic current transformer is used for sampling current of a subscriber line to be tested and sending data to the main control module; and the main control module determines the user line to be tested with the leakage fault according to whether the abnormal current signal exists in each received current data. The technical scheme can reduce the workload of maintenance personnel and improve the efficiency of electric leakage fault investigation.
Description
Technical Field
The invention relates to the technical field of operation and maintenance of power grids, in particular to a leakage fault monitoring device and a leakage fault monitoring method for a power distribution area.
Background
The low-voltage distribution network has the layout characteristics of wide points and multiple faces, the manual inspection and maintenance workload is large, the manual inspection and maintenance workload is easy to overlook, the low-voltage distribution network commonly has long-term undeveloped lines and equipment, a plurality of potential safety hazards exist, and great threat is caused to the reliability of power supply of users. Once electric leakage occurs, power failure of the transformer area is caused, fault positioning and checking are difficult, timeliness is poor, and influence on power supply reliability is large. For a low-voltage power distribution station room provided with a leakage protection switch, multistage protection is generally arranged according to users and load sizes, and common leakage protection is three-stage protection, including total protection and maintenance protection. The setting value of the leakage protection action and the delay time of the leakage protection action are sequentially reduced, and when the three parameters are properly matched, the condition of override action generally does not occur; however, due to the self-failure or the artificial bypass of the middle-protection and household protection equipment, the total protection action can be caused by the leakage failure of the user, and the influence range of the leakage failure is enlarged.
According to the field investigation and data statistics of the partial areas, the proportion of tripping caused by user leakage to the total number of faults of the areas is more than one third. The leakage in households is very secret, and the equipment fault characterization of the leakage is only tripping of a main breaker and a household branch breaker, so that whether the leakage behavior of the household is actually generated is often difficult to distinguish, and maintenance personnel can only detect by utilizing the leakage detection device line by line. However, only one unit meter box contains a plurality of user branches, so that the detection of one unit meter box has huge workload of maintenance personnel, and thus the efficiency of electric leakage fault detection is very low.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a leakage fault monitoring device and a leakage fault monitoring method for a distribution area, so as to reduce the workload of maintenance personnel and improve the efficiency of leakage fault detection.
In a first aspect, an embodiment of the present invention provides an electric leakage fault monitoring device for a power distribution area, including: the system comprises a shell, a main control module, a man-machine interaction module, a communication module and a plurality of branch electromagnetic current transformers;
the main control module, the man-machine interaction module and the communication module are all arranged inside the shell, the man-machine interaction module and the communication module are all electrically connected with the main control module, and the communication module is in wireless connection with the control background; a plurality of branch transformer interfaces are arranged on the side face of the shell and are electrically connected with the main control module; the output end of each branch electromagnetic current transformer is a plug-in connector matched with the branch transformer interface and is used for plugging the plug-in connector of each branch electromagnetic current transformer into each branch transformer interface when electric leakage fault detection is carried out, and the input end of each branch electromagnetic current transformer is an openable ring-shaped ring which is used for being respectively sleeved on a cable of each subscriber line to be tested in the unit ammeter box when electric leakage fault detection is carried out;
each branch electromagnetic current transformer is used for sampling current of a connected subscriber line to be tested and sending sampled current data to the main control module; the main control module determines whether an abnormal current signal representing the leakage fault exists in each received current data according to preset standard signal data so as to determine a user line to be tested with the leakage fault, and displays a leakage fault detection result to maintenance personnel through the man-machine interaction module; and transmitting the currently detected process data result data to the control background through the communication module so as to be recorded and stored by the control background.
Preferably, the man-machine interaction module comprises a display screen embedded in the surface of the shell, and the display screen is used for displaying current data acquired by each branch electromagnetic current transformer; and when the main control module determines that the circuit with the leakage fault exists, the circuit gives an alarm to a user for display.
Preferably, the man-machine interaction module further comprises a plurality of keys, and the keys are used for being triggered by maintenance personnel to execute switch operation on the device and page turning operation on the content displayed on the display screen.
Preferably, the device further comprises a main circuit electromagnetic current transformer, and a main circuit transformer interface electrically connected with the main control module is further arranged on the side surface of the shell; the output end of the main way electromagnetic current transformer is a plug-in type connector matched with the main way transformer interface and is used for being plugged into the main way transformer interface when the leakage fault detection is carried out, the input end of the main way electromagnetic current transformer is an openable ring, and the input end of the main way electromagnetic current transformer is used for being sleeved on a cable of a main switch in the unit ammeter box when the leakage fault detection is carried out so as to sample the current of the unit bus.
Preferably, a power interface electrically connected with the main control module is further arranged on the side face of the shell, and the power interface is used for clamping working voltage from a main switch in the unit distribution box through a plug power line when electric leakage fault detection is carried out, so as to supply power to the device.
In a second aspect, an embodiment of the present invention provides a method for detecting an electric leakage fault, where an implementation subject of the method is an electric leakage fault monitoring device for a power distribution area according to any one of the first aspect, and the method includes the following steps:
step 1: one end of a power line is spliced on a power interface, and the other end of the power line is clamped at a main switch in a unit ammeter box needing to be subjected to leakage fault detection;
step 2: selecting a corresponding number of branch electromagnetic current transformers according to the number of subscriber lines to be tested, and plugging the output end of each branch electromagnetic current transformer on a branch transformer interface, wherein the input end is sleeved on a cable of one branch of subscriber lines to be tested; the output end of the main electromagnetic current transformer is spliced on the main transformer interface, and the input end of the main electromagnetic current transformer is sleeved on a cable of a main switch in the unit ammeter box;
step 3: transmitting power to each user line in the unit ammeter box, and monitoring through a switch key starting device;
step 4: the method comprises the steps that current sampling is carried out on each branch to be detected and a unit total path by using each branch electromagnetic current transformer and a total path electromagnetic current transformer, and sampled current data are sent to a main control module;
step 5: analyzing the received current data by using a main control module according to pre-configured standard signal data, and determining a subscriber line to be tested with leakage faults;
step 6: and alarming and displaying the subscriber line to be tested with the leakage fault to maintenance personnel by utilizing a man-machine interaction module.
Preferably, the step 5 specifically includes:
if current data uploaded by the main circuit transformer interface and current data uploaded by the i-th branch circuit transformer interface are subjected to current mutation, leakage faults exist in the user branch circuit to be tested corresponding to the i-th branch circuit transformer interface.
According to the technical scheme, in the leakage fault monitoring scheme of the distribution area, the branch electromagnetic current transformers in the monitoring device comprise a plurality of branch electromagnetic current transformers, so that each branch electromagnetic current transformer can be practically connected to a cable of one subscriber line to be monitored, the monitoring of the plurality of subscriber lines to be monitored is realized, when tripping occurs next time due to leakage faults, whether abnormal current signals exist or not can be analyzed through current data collected from the connected subscriber lines to be monitored, whether leakage faults exist or not is further determined, and when the number of the branch electromagnetic current transformers is enough, all the subscriber lines in the unit ammeter box can be monitored at one time, so that one-time monitoring is realized. In the original scheme, only one subscriber line to be tested can be concerned at a time, and the line with the leakage fault can be determined only through tripping and power failure for a plurality of times. Therefore, the technical scheme can reduce the workload of maintenance personnel, and can detect the user line with the leakage fault in a shorter time, thereby greatly improving the efficiency of the leakage fault investigation.
Drawings
Fig. 1 is a schematic front view of an electric leakage fault monitoring device for a power distribution area according to an embodiment of the present invention.
Fig. 2 is a schematic side view of an electric leakage fault monitoring device for a power distribution area according to an embodiment of the present invention.
Fig. 3 is a schematic functional block diagram of a leakage fault monitoring device for a power distribution area according to an embodiment of the present invention.
In the figure: the device comprises a shell 1, a branch electromagnetic current transformer 2, a branch transformer interface 3, a display screen 4, keys 5, a main electromagnetic current transformer 6, a main transformer interface 7 and a power interface 8.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Referring to fig. 1-3, the present invention provides a leakage fault monitoring device for a power distribution area, including: the device comprises a shell 1, a main control module, a man-machine interaction module, a communication module and a plurality of branch electromagnetic current transformers 2;
the main control module, the man-machine interaction module and the communication module are all arranged in the shell 1, the man-machine interaction module and the communication module are all electrically connected with the main control module, and the communication module is in wireless connection with the control background; a plurality of branch transformer interfaces 3 are arranged on the side surface of the shell 1, and the plurality of branch transformer interfaces 3 are electrically connected with the main control module; the output end of each branch electromagnetic current transformer 2 is a plug-in connector matched with the branch transformer interface 3, and is used for plugging the plug-in connector of each branch electromagnetic current transformer 2 into each branch transformer interface 3 when electric leakage fault detection is carried out, and the input end of each branch electromagnetic current transformer 2 is an openable ring-shaped ring which is used for being respectively sleeved on a cable of each subscriber line to be tested in the unit ammeter box when electric leakage fault detection is carried out;
each branch electromagnetic current transformer 2 is used for sampling the current of the connected subscriber line to be tested and sending the sampled current data to the main control module; the main control module determines whether an abnormal current signal representing the leakage fault exists in each received current data according to preset standard signal data so as to determine a user line to be tested with the leakage fault, and displays a leakage fault detection result to maintenance personnel through the man-machine interaction module; and transmitting the currently detected process data result data to the control background through the communication module so as to be recorded and stored by the control background.
In this embodiment, the branch electromagnetic current transformers 2 in the monitoring device include a plurality of branch electromagnetic current transformers 2, so that each branch electromagnetic current transformer 2 can be actually connected to a cable of a subscriber line to be tested, and monitoring of a plurality of subscriber lines to be tested is achieved at the same time. Therefore, each user line does not need to be detected in sequence, so that the detection efficiency of the leakage fault can be greatly improved, and meanwhile, the electricity utilization experience of a user is improved.
In one embodiment, the man-machine interaction module comprises a display screen 4 embedded in the surface of the housing 1, wherein the display screen 4 is used for displaying current data acquired by each branch electromagnetic current transformer 2; and when the main control module determines that the circuit with the leakage fault exists, the circuit gives an alarm to a user for display. The display 4 may use an LED liquid crystal display 4. Of course, the man-machine interaction module may further include an indicator light, for example, the indicator light may include an indicator light for indicating that the monitoring device is working, an indicator light for indicating whether the network is normal, an indicator light for indicating a power supply, an alarm indicator light for detecting an electric leakage fault, and the like.
In one embodiment, the man-machine interaction module further comprises a plurality of keys 5 for triggering by a maintenance person to perform a switching operation on the device and a page turning operation on the content displayed on the display screen 4. For example, the key 5 may include an up key, a down key, a ok key, a power switch key, and the like.
In one embodiment, the device can further comprise a main electromagnetic current transformer 6, and the side surface of the shell 1 is further provided with a main transformer interface 7 electrically connected with the main control module; the output end of the main circuit electromagnetic current transformer 6 is a plug-in type connector which is matched with the main circuit transformer interface 7 and is used for being plugged into the main circuit transformer interface 7 when the leakage fault detection is carried out, and the input end of the main circuit electromagnetic current transformer 6 is an openable ring and is used for being sleeved on a cable of a main switch in the unit ammeter box when the leakage fault detection is carried out so as to sample the current of the unit bus.
In the actual leakage application scenario, the situation that the bus line entering the unit leaks sometimes occurs, so in order to further improve the accuracy of leakage detection, the embodiment considers setting the total-path electromagnetic current transformer 6 and the total-path transformer interface 7. Therefore, by sampling the current on the bus entering the unit building, whether the current is the leakage of the bus entering the unit building can be determined, the detection accuracy is improved, and meanwhile, the situation that a great deal of time is spent for detecting the leakage of the bus as the leakage of the subscriber line by mistake is avoided, so that the detection time can be saved. Meanwhile, by utilizing the current data acquired by the probe of the main electromagnetic current transformer 6 and the data acquired by the probe of the branch electromagnetic current transformer, the line with the leakage fault can be accurately judged. For example, when an abnormal current signal appears on both the main circuit and a certain branch circuit, it can be known that the current mutation of the main circuit is caused due to the leakage fault of the branch circuit, so that it can be determined that the current leakage fault of the branch circuit occurs.
In addition, by combining current data collection of the branch circuit and the total circuit, whether the total circuit is caused by the leakage fault of a certain user circuit or other circuits are tripped can be judged. For example, when the current data in the total path is not zero, and the current of a plurality of branches is zero, the current data indicates that one branch has a leakage fault and causes tripping of other branches. For another example, when the current data of each branch is zero and the current data in the main circuit is zero, it can be known that a leakage fault exists in a certain branch and causes tripping of the main circuit switch on the premise of excluding collective power failure in the whole area.
In one embodiment, the side surface of the housing 1 is further provided with a power interface 8 electrically connected with the main control module, and the power interface 8 is used for clamping the working voltage from the main switch in the unit distribution box through a plug power line when the leakage fault is detected, so as to supply power to the device. In this embodiment, the voltage at the main switch can be directly used to supply power to the device, and the device can also use a battery to supply power.
In addition, because the leakage current may be increased instantaneously during the leakage, the induced voltage may also reach a higher value, so the detection device may also be equipped with an over-current protection module, for example, a voltage stabilizing diode scheme is adopted to design an over-voltage protection circuit. Under the normal working condition of the system, the partial circuit is not effective, and when the instantaneous high voltage is met, the voltage stabilizing diode can be instantaneously reversely conducted and instantaneously release a large amount of energy to pull down the voltage. When the voltage is pulled down to the allowable range, the voltage stabilizing diode restores the high-resistance state, so that the circuit works normally, and the protection of the circuit is realized.
The embodiment of the invention also provides a leakage fault detection method, the implementation main body of the method is a leakage fault monitoring device of any power distribution area, and the method comprises the following steps:
step 1: one end of a power line is spliced on a power interface, and the other end of the power line is clamped at a main switch in a unit ammeter box needing to be subjected to leakage fault detection;
step 2: selecting a corresponding number of branch electromagnetic current transformers according to the number of subscriber lines to be tested, and plugging the output end of each branch electromagnetic current transformer on a branch transformer interface, wherein the input end is sleeved on a cable of one branch of subscriber lines to be tested; the output end of the main electromagnetic current transformer is spliced on the main transformer interface, and the input end of the main electromagnetic current transformer is sleeved on a cable of a main switch in the unit ammeter box;
step 3: transmitting power to each user line in the unit ammeter box, and monitoring through a switch key starting device;
step 4: the method comprises the steps that current sampling is carried out on each branch to be detected and a unit total path by using each branch electromagnetic current transformer and a total path electromagnetic current transformer, and sampled current data are sent to a main control module;
step 5: analyzing the received current data by using a main control module according to pre-configured standard signal data, and determining a subscriber line to be tested with leakage faults;
step 6: and alarming and displaying the subscriber line to be tested with the leakage fault to a maintenance person by utilizing the man-machine interaction module.
When the leakage fault monitoring device for the distribution area is used for monitoring leakage faults, the device is firstly installed in a power supply ammeter box which needs to be subjected to leakage fault detection. For example, a subscriber line with a leakage fault may exist in a certain unit, and an over-trip occurs before. The electromagnetic current transformers of all branches of the device are arranged on all user branches in the electric meter box of the unit, the electromagnetic current transformers of all branches are arranged on the cable of the main switch, power is supplied to all user lines of the unit, and the device is started to monitor. When tripping occurs again due to the leakage fault, the corresponding line can generate abrupt current, so that the electromagnetic current transformer can monitor current data and send the current data to the main control module, and the main control module can determine the user line with the leakage fault according to the received current data and standard signal data. For example, if the current data uploaded by the ith branch and the total circuit have current mutation compared with the standard signal data, it is indicated that the user line corresponding to the ith branch has leakage fault. The system can further alarm maintenance personnel through the man-machine interaction module, and can also upload related detection data to the control background through the communication module so as to be recorded and stored by the control background.
Therefore, the leakage condition of the low-voltage outgoing line can be monitored in real time, the occurrence of leakage accidents is effectively avoided, and personal safety is guaranteed. And secondly, the device provided by the scheme adopts an advanced technology, is simple and convenient to operate, does not need professional maintenance, and reduces the use cost. In addition, the device can be installed to improve stability and reliability of low-voltage outgoing line greatly, has avoided the economic loss such as stopping production, equipment damage because of the electric leakage problem leads to.
The method embodiment provided by the invention is based on the same inventive concept as the embodiment of the device in the present specification, and the specific content can be referred to the description in the embodiment of the device in the present specification, which is not repeated here.
The modules or units in the device of the embodiment of the invention can be combined, divided and deleted according to actual needs. The foregoing disclosure is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced with equivalents thereof, which fall within the scope of the invention as defined by the appended claims.
Claims (7)
1. An electrical leakage fault monitoring device for a power distribution area, comprising: the system comprises a shell, a main control module, a man-machine interaction module, a communication module and a plurality of branch electromagnetic current transformers;
the main control module, the man-machine interaction module and the communication module are all arranged inside the shell, the man-machine interaction module and the communication module are all electrically connected with the main control module, and the communication module is in wireless connection with the control background; a plurality of branch transformer interfaces are arranged on the side face of the shell and are electrically connected with the main control module; the output end of each branch electromagnetic current transformer is a plug-in connector matched with the branch transformer interface and is used for plugging the plug-in connector of each branch electromagnetic current transformer into each branch transformer interface when electric leakage fault detection is carried out, and the input end of each branch electromagnetic current transformer is an openable ring-shaped ring which is used for being respectively sleeved on a cable of each subscriber line to be tested in the unit ammeter box when electric leakage fault detection is carried out;
each branch electromagnetic current transformer is used for sampling current of a connected subscriber line to be tested and sending sampled current data to the main control module; the main control module determines whether an abnormal current signal representing the leakage fault exists in each received current data according to preset standard signal data so as to determine a user line to be tested with the leakage fault, and displays a leakage fault detection result to maintenance personnel through the man-machine interaction module; and transmitting the currently detected process data result data to the control background through the communication module so as to be recorded and stored by the control background.
2. The leakage fault monitoring device for a power distribution area according to claim 1, wherein the man-machine interaction module comprises a display screen embedded in the surface of the shell, and the display screen is used for displaying current data acquired by each branch electromagnetic current transformer; and when the main control module determines that the circuit with the leakage fault exists, the circuit gives an alarm to a user for display.
3. The electrical leakage fault monitoring device of the power distribution area according to claim 2, wherein the man-machine interaction module further comprises a plurality of keys for being triggered by a serviceman to perform a switching operation on the device and a page turning operation on the content displayed on the display screen.
4. The leakage fault monitoring device of the power distribution area according to claim 1, further comprising a main circuit electromagnetic current transformer, wherein a main circuit transformer interface electrically connected with the main control module is further arranged on the side surface of the shell; the output end of the main way electromagnetic current transformer is a plug-in type connector matched with the main way transformer interface and is used for being plugged into the main way transformer interface when the leakage fault detection is carried out, the input end of the main way electromagnetic current transformer is an openable ring, and the input end of the main way electromagnetic current transformer is used for being sleeved on a cable of a main switch in the unit ammeter box when the leakage fault detection is carried out so as to sample the current of the unit bus.
5. The leakage fault monitoring device of any one of claims 1 to 4, wherein a power interface electrically connected to the main control module is further provided on a side surface of the housing, and the power interface is configured to clamp an operating voltage from a main switch in the unit distribution box through a plug power line when the leakage fault is detected, so as to supply power to the device.
6. A leakage fault detection method, characterized in that the implementation body is a leakage fault monitoring device of the distribution area according to any one of claims 1-5, the method comprising the steps of:
step 1: one end of a power line is spliced on a power interface, and the other end of the power line is clamped at a main switch in a unit ammeter box needing to be subjected to leakage fault detection;
step 2: selecting a corresponding number of branch electromagnetic current transformers according to the number of subscriber lines to be tested, and plugging the output end of each branch electromagnetic current transformer on a branch transformer interface, wherein the input end is sleeved on a cable of one branch of subscriber lines to be tested; the output end of the main electromagnetic current transformer is spliced on the main transformer interface, and the input end of the main electromagnetic current transformer is sleeved on a cable of a main switch in the unit ammeter box;
step 3: transmitting power to each user line in the unit ammeter box, and monitoring through a switch key starting device;
step 4: the method comprises the steps that current sampling is carried out on each branch to be detected and a unit total path by using each branch electromagnetic current transformer and a total path electromagnetic current transformer, and sampled current data are sent to a main control module;
step 5: analyzing the received current data by using a main control module according to pre-configured standard signal data, and determining a subscriber line to be tested with leakage faults;
step 6: and alarming and displaying the subscriber line to be tested with the leakage fault to maintenance personnel by utilizing a man-machine interaction module.
7. The leakage fault detection method according to claim 6, wherein the step 5 specifically comprises:
if current data uploaded by the main circuit transformer interface and current data uploaded by the i-th branch circuit transformer interface are subjected to current mutation, leakage faults exist in the user branch circuit to be tested corresponding to the i-th branch circuit transformer interface.
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| CN202311774584.3A CN117761576A (en) | 2023-12-22 | 2023-12-22 | Leakage fault monitoring device and leakage fault monitoring method in distribution area |
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| CN202311774584.3A CN117761576A (en) | 2023-12-22 | 2023-12-22 | Leakage fault monitoring device and leakage fault monitoring method in distribution area |
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Application publication date: 20240326 |
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| RJ01 | Rejection of invention patent application after publication |