CN112491007B - Leakage current protection, monitoring and early warning system and method - Google Patents
Leakage current protection, monitoring and early warning system and method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/14—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to occurrence of voltage on parts normally at earth potential
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Abstract
The invention relates to a leakage current protection, monitoring and early warning system and method, and belongs to the technical field of low-voltage power distribution of power systems. The system comprises: the system is free from starting an electric leakage monitoring and early warning device, a high-sensitivity electric leakage protection switch and an information processing background; the non-self-starting leakage monitoring and early warning device comprises a power taking module, a leakage monitoring module, a wireless transmission module A and an early warning system B; the high-sensitivity leakage protection switch comprises a magnetic modulation transformer coil, an intelligent monitoring module, a wireless transmission module C, an early warning system D and a switch; the invention can monitor the circuit to realize the real-time monitoring and information storage of AC/DC leakage and step voltage, and if a plurality of positions are monitored at the same time, the specific position where the step voltage occurs can be judged according to the source of the signal to realize the positioning function. Meanwhile, the system adopts a double-guarantee method, so that the reliability of leakage protection is improved, and the risk of personal casualty accidents caused by low-voltage leakage is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of low-voltage power distribution of power systems, and particularly relates to a leakage current protection, monitoring and early warning system and method.
Background
At present, the low-voltage leakage monitoring and isolation technology mainly comprises the steps of installing a traditional leakage protector, only singly detecting alternating current or direct current, having low sensitivity and easily generating misoperation, causing frequent tripping and affecting the power supply reliability. An external power supply is needed to supply power to the monitoring equipment, certain loss exists, and the risks of electric shock and equipment misoperation caused by electric leakage of the external power supply exist. A set of leakage early warning system facing to power supply enterprises and society is not established, leakage early warning cannot be performed in time, and once a leakage current protector fails, the risk of electric shock caused by the fact that personnel approach a leakage current point still exists. Meanwhile, a power supply enterprise cannot quickly position the leakage position, and residual current is eliminated.
Therefore, it is necessary to invent a system for monitoring leakage current of electric equipment so as to be installed in a dense area of people, prevent personal electric shock, reduce personal casualty accidents, and reduce the probability of fire occurrence caused by the occurrence of the leakage current.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a leakage current protection, monitoring and early warning system and method.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a leakage current protection, monitoring, early warning system comprising: the system is free from starting an electric leakage monitoring and early warning device, a high-sensitivity electric leakage protection switch and an information processing background;
the non-self-starting leakage monitoring and early warning device comprises a power taking module, a leakage monitoring module, a wireless transmission module A and an early warning system B;
the high-sensitivity leakage protection switch comprises a magnetic modulation transformer coil, an intelligent monitoring module, a wireless transmission module C, an early warning system D and a switch;
the electric leakage monitoring and early warning device is fixed in the soil near the electric pole tower;
the high-sensitivity leakage protection switch is arranged on the power transmission line;
the power-taking module is used for taking power from the step voltage formed by the leakage current;
the electric leakage monitoring module is used for receiving the electric energy acquired by the electric module, and when the electric leakage monitoring module acquires the electric energy, the electric leakage monitoring module judges that electric leakage occurs, and sends out a first command signal and a second command signal;
the wireless transmission module A is connected with the electric leakage monitoring module and is used for sending a signal to the wireless transmission module C of the high-sensitivity electric leakage protection switch according to the first command signal;
the early warning system B is connected with the electric leakage monitoring module and used for sending out an alarm signal according to the second command signal;
the magnetic modulation transformer coil is a round-ring magnetic core wound with a wire, and a live wire and a zero wire of the wire pass through a round hole in the center of the magnetic core side by side;
the intelligent monitoring module is respectively connected with the magnetic modulation transformer coil and the wireless transmission module C, when electric leakage occurs, the sum of current vectors of a live wire and a zero line is not zero, a magnetic field is generated, the magnetic field is collected by the magnetic modulation transformer coil and is converted into a leakage current signal to be transmitted to the intelligent monitoring module, and the intelligent monitoring module sends out a third command signal, a fourth command signal and a fifth command signal;
the wireless transmission module C is connected with the intelligent monitoring module and is used for transmitting the electric leakage information to the information processing background according to a third command signal;
the early warning system D is connected with the intelligent monitoring module and used for sending out an early warning signal according to the fourth command signal;
the switch is arranged on the power transmission line, is connected with the intelligent monitoring module and is used for disconnecting the line according to the fifth command signal;
the wireless transmission module C is also used for receiving the leakage current signal sent by the wireless transmission module A, and when the intelligent monitoring module receives the leakage current signal, a third command signal, a fourth command signal and a fifth command signal are also sent out;
and the information processing background is used for receiving the leakage current information transmitted by the wireless transmission module C.
Further, preferably, the leakage monitoring module is configured to obtain direct current output by the energy taking module for self-operation; if no leakage exists, the passive self-starting leakage monitoring and early warning device is in a closed state, if a direct current signal is obtained, the occurrence of leakage is indicated, early warning information is sent out, meanwhile, the leakage signal is transmitted to the high-sensitivity leakage protection switch through the wireless transmission module A, and the high-sensitivity leakage protection switch sends out an alarm, disconnects a line and sends leakage current information to an information processing background.
Further, it is preferable that the leakage monitoring and early warning device is fixed in the soil 50cm away from the electric pole tower.
Further, it is preferable that the wireless transmission module a is a superheterodyne module.
Further, preferably, the early warning signal sent by the early warning system B is an acousto-optic early warning signal.
Further, preferably, the early warning signal sent by the early warning system D is an acousto-optic early warning signal.
Further, preferably, the information processing background is configured to receive the leakage current information transmitted by the wireless transmission module C, and display and store the leakage current information.
The invention also provides a leakage current protection, monitoring and early warning method, which adopts the leakage current protection, monitoring and early warning system and comprises the following steps:
based on passive self-starting electric leakage monitoring and early warning device:
s11, installing a leakage current non-self-starting leakage monitoring and early warning device based on a step voltage principle at a telegraph pole tower;
s12, after the step S11, when electric leakage occurs, the electricity taking module takes electricity from the step voltage formed by the leakage current, and meanwhile, the alternating current electric energy is converted into direct current electric energy so as to enable the electric leakage monitoring module to work;
s13, after the step S12, the leakage monitoring module controls the early warning system B to send out sound early warning, and simultaneously controls the wireless transmission module A to transmit leakage current signals to the wireless transmission module C of the high-sensitivity leakage protection switch;
s14, after the step S13, when the intelligent monitoring module in the high-sensitivity leakage protection switch detects a leakage current signal received by the wireless transmission module C, controlling the early warning system D to send out sound early warning, simultaneously controlling the switch to disconnect a line, and controlling the wireless transmission module C to send leakage current information to an information processing background;
s15, after the step S14, displaying and storing leakage current information by an information processing background;
based on the high sensitivity leakage protection switch:
s21, installing a high-sensitivity leakage protection switch on an indoor power transmission line;
s22, after the step S21, the magnetic modulation transformer coil collects leakage current in the power transmission line in real time, and when the leakage current occurs, a leakage current signal is collected and transmitted to the intelligent monitoring module;
s23, after the step S22, the intelligent monitoring module receives the electric leakage signal, controls the early warning system D to send out audible and visual alarm, simultaneously controls the switch to disconnect a line, and controls the wireless transmission module C to send electric leakage information to the information processing background;
s24, after the step S23, the information processing background displays and stores leakage current information.
The energy taking module is an ultra-low power consumption module, and can convert an alternating current signal into a direct current voltage signal applicable to the leakage monitoring module with the lowest power consumption.
The magnetic modulation transformer coil acquires direct current leakage current signals and alternating current leakage current signals in real time according to a magnetic modulation principle.
The intelligent monitoring module can perform fast Fourier transform on the acquired leakage current signal to obtain the frequency spectrum of the signal, and identify whether the signal contains alternating current, direct current or alternating current-direct current components according to the frequency spectrum analysis of the signal. After the leakage current signal detected by the magnetic modulation transformer coil and the leakage current signal sent to the wireless transmission module C by the wireless transmission module A are obtained, early warning information and line disconnection information are sent out.
The wireless transmission module C may implement one-to-one, one-to-many, or many-to-many communication. And when receiving the leakage current signal of the wireless transmission module A, sending the leakage current signal to the intelligent detection module and the information processing background.
The working principle of the invention is as follows:
the high-sensitivity leakage protection switch based on the self-adaptive magnetic modulation AC/DC leakage protection mechanism comprises a wireless transmission module, an early warning module, an intelligent monitoring module, a magnetic modulation transformer coil and a switch. The magnetically modulated transformer coil is designed according to the principle of magnetic modulation, and according to the ampere loop theorem, the line integral of the magnetic field strength of any closed loop in the magnetic field is equal to the algebraic sum of the currents in the closed path. I.e.
Therefore, no matter direct current or alternating current leakage occurs, magnetic field intensity can be generated around, and the magnetic modulation transformer coil can sense the magnetic field intensity and output the magnetic field intensity to the intelligent detection module in the form of voltage signals. The intelligent detection module can analyze the input voltage signal, so that the generated electric leakage type is judged, and the simultaneous detection of AC/DC electric leakage is realized. And then an alarm is sent out as a basis, the switch is controlled to disconnect the line, and meanwhile, the leakage information is sent to the information processing background for storage through the wireless transmission module.
The high-sensitivity leakage protection switch based on the self-adaptive magnetic modulation AC/DC leakage protection mechanism is connected with the leakage current passive self-starting leakage monitoring and early warning device through the wireless transmission module, and the high-sensitivity leakage protection switch can be connected with the leakage current passive self-starting leakage monitoring and early warning device one to one, one to many or many to many. When the one-to-many or many-to-many connection mode is adopted, different devices can be numbered, so that the position of the equipment sending the signal is identified, and the positioning function of the leakage point is realized.
The leakage current non-self-starting leakage monitoring and early warning device based on the step voltage principle comprises an energy taking module, a wireless transmission module, a leakage monitoring module and an early warning module. When no electric leakage occurs, the device is in a closed state, so that the energy consumption can be reduced, and the danger caused by the electric leakage of the device can be avoided. When step voltage exists, the energy taking module can take out electric energy from leakage current for the device to work, the early warning module gives an alarm and sends a signal to the wireless transmission module of the leakage protection switch. When the wireless transmission module of the high-sensitivity leakage protection switch receives signals, the intelligent monitoring module controls the early warning system to alarm and the switch to disconnect a circuit, and sends leakage information to the information processing background for storage, so that later maintenance personnel can conveniently maintain.
The content of the first command signal is that the wireless transmission module A is controlled to send a signal to the wireless transmission module C of the high-sensitivity leakage protection switch; the content of the second command signal is that the control early warning system B sends out an alarm signal; the third command signal is used for controlling the wireless transmission module C to transmit leakage information to the information processing background (3); the content of the fourth command signal is that the control early warning system D sends out an early warning signal; the fifth command signal is to control the switch to disconnect the line.
Preferably, the sensitivity of the high-sensitivity leakage protection switch is 6 multiplied by 10 -4 V/mA。
Compared with the prior art, the invention has the beneficial effects that:
the invention constructs a complete set of low-voltage distribution network leakage current protection, monitoring and early warning system, accurately detects 30mA direct current and 30mA and 50-1 kHz alternating current leakage signals generated on a line through the leakage detection module and the magnetic modulation transformer coil, effectively solves the problem that a leakage protection switch can only singly detect alternating current or direct current, and can monitor 36V step voltage leakage. Meanwhile, when the leakage protection switch leaks, the leakage monitoring is carried out by starting the leakage monitoring and early warning device through the leakage current, so that the reliability of the leakage monitoring is greatly improved. Under the condition that a plurality of devices are used for constructing the system, the electric leakage point can be positioned, and the system has higher application value.
The invention can monitor 220V line to realize real-time monitoring and information storage of AC/DC leakage and step voltage, and if multiple positions are monitored at the same time, the specific position where step voltage occurs can be judged according to the source of signal to realize positioning function. In addition, if the circuit is leaked, but the high-sensitivity leakage protection switch does not detect the leakage due to some reasons, the leakage current passive self-starting leakage monitoring and early warning device can also disconnect the circuit. The system and the application method use a double-guarantee method, so that the reliability of the leakage protection is improved, and the risk of personal casualty accidents caused by low-voltage leakage is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the basic structure of the leakage current protection, detection and early warning system of the present invention;
FIG. 2 is a flow chart of an application method of the present invention in the case of a single set of leakage current protection, detection and early warning systems;
fig. 3 is a schematic diagram of the application of the leakage current protection, detection and early warning system of the present invention in a plurality of cases.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the present invention and should not be construed as limiting the scope of the invention. The specific techniques or conditions are not identified in the examples and are performed according to techniques or conditions described in the literature in this field or according to the product specifications. The materials or equipment used are conventional products available from commercial sources, not identified to the manufacturer.
Fig. 1 is a schematic diagram of a basic structure of a leakage current protection, detection and early warning system, including: a leakage current protection, monitoring and early warning system is characterized in that: comprising the following steps: the device is free from starting an electric leakage monitoring and early warning device 1, a high-sensitivity electric leakage protection switch 2 and an information processing background 3;
the non-self-starting leakage monitoring and early warning device 1 comprises a power taking module 11, a leakage monitoring module 12, a wireless transmission module A13 and an early warning system B14;
the high-sensitivity leakage protection switch 2 comprises a magnetic modulation transformer coil 21, an intelligent monitoring module 22, a wireless transmission module C23, an early warning system D24 and a switch 25;
the electric leakage monitoring and early warning device 1 is fixed in soil near a telegraph pole tower; preferably, it is fixed in the soil at a distance of 50cm from the pole tower;
the high-sensitivity leakage protection switch 2 is arranged on the power transmission line;
the power taking module 11 takes power from the step voltage formed by the leakage current;
the electric leakage monitoring module 12 is used for receiving the electric energy acquired by the electric module 11, and when the electric leakage monitoring module 12 acquires the electric energy, the electric leakage is judged to occur, and a first command signal and a second command signal are sent out;
the wireless transmission module A13 is connected with the electric leakage monitoring module 12 and is used for sending a signal to a wireless transmission module C23 of the high-sensitivity electric leakage protection switch 2 according to the first command signal;
the early warning system B14 is connected with the electric leakage monitoring module 12 and is used for sending out an alarm signal according to the second command signal;
the magnetic modulation transformer coil 21 is a circular ring magnetic core wound with a wire, and a live wire and a zero wire of the wire pass through a round hole in the center of the magnetic core side by side;
the intelligent monitoring module 22 is respectively connected with the magnetic modulation transformer coil 21 and the wireless transmission module C23, when electric leakage occurs, the current vector sum of the live wire and the zero line is not zero, a magnetic field is generated, the magnetic modulation transformer coil 21 can collect the magnetic field and convert the magnetic field into a leakage current signal to be transmitted to the intelligent monitoring module 22, and the intelligent monitoring module 22 can send out a third command signal, a fourth command signal and a fifth command;
the wireless transmission module C23 is connected with the intelligent monitoring module 22 and is used for transmitting the electric leakage information to the information processing background 3 according to the third command signal;
the early warning system D24 is connected with the intelligent monitoring module 22 and is used for sending out an early warning signal according to the fourth command signal;
a switch 25, mounted on the power transmission line and connected to the intelligent monitoring module 22, for disconnecting the line according to the fifth command signal;
the wireless transmission module C23 is further configured to receive the leakage current signal sent by the wireless transmission module a13, and when the intelligent monitoring module 22 receives the signal, send out a third command signal, a fourth command signal, and a fifth command signal;
the information processing background 3 is configured to receive the leakage current information transmitted by the wireless transmission module C23.
Preferably, the leakage monitoring module 12 is configured to obtain the direct current output by the energy taking module 11 for self-operation; if no leakage occurs, the passive self-starting leakage monitoring and early warning device 1 is in a closed state, if a direct current signal is obtained, the early warning information is sent out when the leakage occurs, meanwhile, the leakage signal is transmitted to the high-sensitivity leakage protection switch 2 through the wireless transmission module A13, so that the high-sensitivity leakage protection switch 2 sends out an alarm, breaks a line and sends leakage current information to the information processing background 3.
Preferably, the wireless transmission module a13 is a superheterodyne module, so that long-distance transmission can be realized.
Preferably, the early warning signal sent by the early warning system B14 is an acousto-optic early warning signal.
Preferably, the early warning signal sent by the early warning system D24 is an acousto-optic early warning signal.
Preferably, the information processing background 3 is configured to receive the leakage current information transmitted by the wireless transmission module C23, and display and store the leakage current information.
Preferably, the sensitivity of the high-sensitivity leakage protection switch is 6×10 -4 V/mA。
Fig. 2 is a flow chart of an application method of a leakage current protection, detection and early warning system, the application method includes the steps of:
leakage current based on contact voltage principle does not originate from starting leakage monitoring and early warning device:
s11, installing a leakage current non-self-starting leakage monitoring and early warning device based on a step voltage principle at a telegraph pole tower;
s12, after the step S11, when electric leakage occurs, the electricity taking module takes electricity from the step voltage formed by the leakage current, and meanwhile, the alternating current electric energy is converted into direct current electric energy so as to enable the electric leakage monitoring module to work;
s13, after the step S12, the leakage monitoring module controls the early warning system B to send out sound early warning, and simultaneously controls the wireless transmission module A to transmit leakage current signals to the wireless transmission module C of the high-sensitivity leakage protection switch;
s14, after the step S13, when the intelligent monitoring module in the high-sensitivity leakage protection switch detects a leakage current signal received by the wireless transmission module C, controlling the early warning system D to send out sound early warning, simultaneously controlling the switch to disconnect a line, and controlling the wireless transmission module C to send leakage current information to an information processing background;
s15, after the step S14, displaying and storing leakage current information by an information processing background;
high-sensitivity leakage protection switch based on self-adaptive magnetic modulation AC/DC leakage protection mechanism:
s21, installing a high-sensitivity leakage protection switch on an indoor power transmission line;
s22, after the step S21, the magnetic modulation transformer coil collects leakage current in the power transmission line in real time, and when the leakage current occurs, a leakage current signal is collected and transmitted to the intelligent monitoring module;
s23, after the step S22, the intelligent monitoring module receives the electric leakage signal, controls the early warning system D to send out audible and visual alarm, simultaneously controls the switch to disconnect a line, and controls the wireless transmission module C to send electric leakage information to the information processing background;
s24, after the step S23, the information processing background displays and stores leakage current information.
Fig. 3 is a schematic diagram of an application of a leakage current protection, detection and early warning system under multiple groups of conditions, including: in the case of using a plurality of devices to construct a system, the leakage point can also be located. The specific scheme is as follows:
the system is installed on a street with 10 telegraph poles, the street is divided into 10 sections, a passive self-starting leakage monitoring and early warning device is installed at the telegraph pole of each section, a high-sensitivity leakage protection switch is installed on a control cabinet of the telegraph pole, an information processing background is installed on the total control cabinet, and 21 devices are combined to form a leakage current protection, detection and early warning system. The numbers of the passive self-starting leakage monitoring and early warning devices are sequentially 1-1 to 1-10, the numbers of the high-sensitivity leakage protection switches are sequentially 2-1 to 2-10, and the numbers are in one-to-one correspondence, such as 1-1 corresponds to 2-1. When the line is leaked, the wireless transmission module C sends the number of the leakage position to the information processing background, and the position of the equipment sending out the signal is identified through the number displayed by the information processing background, so that the positioning function of the leakage point is realized.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A leakage current protection, monitoring and early warning system is characterized in that: comprising the following steps: the system comprises a self-starting leakage monitoring and early warning device (1), a high-sensitivity leakage protection switch (2) and an information processing background (3);
the non-self-starting electric leakage monitoring and early warning device (1) comprises an electricity taking module (11), an electric leakage monitoring module (12), a wireless transmission module A (13) and an early warning system B (14);
the high-sensitivity leakage protection switch (2) comprises a magnetic modulation transformer coil (21), an intelligent monitoring module (22), a wireless transmission module C (23), an early warning system D (24) and a switch (25);
the electric leakage monitoring and early warning device (1) is fixed in soil near the electric pole tower;
the high-sensitivity leakage protection switch (2) is arranged on the power transmission line;
the power taking module (11) is used for taking power from the step voltage formed by the leakage current;
the electric leakage monitoring module (12) is used for receiving the electric energy acquired by the electric module (11), and when the electric leakage monitoring module (12) acquires the electric energy, the electric leakage is judged to occur, and a first command signal and a second command signal are sent out;
the wireless transmission module A (13) is connected with the electric leakage monitoring module (12) and is used for sending a signal to the wireless transmission module C (23) of the high-sensitivity electric leakage protection switch (2) according to the first command signal;
the early warning system B (14) is connected with the electric leakage monitoring module (12) and is used for sending out an alarm signal according to the second command signal;
the magnetic modulation transformer coil (21) is a circular ring magnetic core wound with a wire, and a live wire and a zero wire of the wire pass through a round hole in the center of the magnetic core side by side;
the intelligent monitoring module (22) is respectively connected with the magnetic modulation transformer coil (21) and the wireless transmission module C (23), when electric leakage occurs, the current vector sum of the live wire and the zero line is not zero, a magnetic field is generated, the magnetic field is collected by the magnetic modulation transformer coil (21), and the magnetic field is converted into a leakage current signal and transmitted to the intelligent monitoring module (22), so that the intelligent monitoring module (22) sends a third command signal, a fourth command signal and a fifth command;
the wireless transmission module C (23) is connected with the intelligent monitoring module (22) and is used for transmitting leakage information to the information processing background (3) according to a third command signal;
the early warning system D (24) is connected with the intelligent monitoring module (22) and is used for sending out an early warning signal according to the fourth command signal;
the switch (25) is arranged on the power transmission line and connected with the intelligent monitoring module (22) and used for disconnecting the line according to the fifth command signal;
the wireless transmission module C (23) is also used for receiving the leakage current signal sent by the wireless transmission module A (13), and when the intelligent monitoring module (22) receives the leakage current signal, a third command signal, a fourth command signal and a fifth command signal are also sent out;
and the information processing background (3) is used for receiving the leakage current information transmitted by the wireless transmission module C (23).
2. The leakage current protection, monitoring and early warning system according to claim 1, characterized in that the leakage current monitoring module (12) is used for obtaining direct current output by the energy taking module (11) for self operation; if no leakage exists, the passive self-starting leakage monitoring and early warning device (1) is in a closed state, if a direct current signal is acquired, the early warning information is sent out when the leakage is indicated to occur, meanwhile, the leakage signal is transmitted to the high-sensitivity leakage protection switch (2) through the wireless transmission module A (13), so that the high-sensitivity leakage protection switch (2) sends out an alarm, breaks a line and sends leakage current information to the information processing background (3).
3. The leakage current protection, monitoring and early warning system according to claim 1, characterized in that the leakage current monitoring and early warning device (1) is fixed in the soil 50cm from the telegraph pole tower.
4. The leakage current protection, monitoring and early warning system according to claim 1, characterized in that the wireless transmission module a (13) is a superheterodyne module.
5. The leakage current protection, monitoring and early warning system according to claim 1, characterized in that the early warning signal sent by the early warning system B (14) is an acousto-optic early warning.
6. The leakage current protection, monitoring and early warning system according to claim 1, characterized in that the early warning signal sent by the early warning system D (24) is an acousto-optic early warning.
7. The leakage current protection, monitoring and early warning system according to claim 1, characterized in that the information processing background (3) is configured to receive leakage current information transmitted by the wireless transmission module C (23), and display and store the leakage current information.
8. The leakage current protection, monitoring and early warning method adopting the leakage current protection, monitoring and early warning system according to any one of claims 1-7 is characterized by comprising the following steps:
based on passive self-starting electric leakage monitoring and early warning device:
s11, installing a leakage current non-self-starting leakage monitoring and early warning device based on a step voltage principle at a telegraph pole tower;
s12, after the step S11, when electric leakage occurs, the electricity taking module takes electricity from the step voltage formed by the leakage current, and meanwhile, the alternating current electric energy is converted into direct current electric energy so as to enable the electric leakage monitoring module to work;
s13, after the step S12, the leakage monitoring module controls the early warning system B to send out sound early warning, and simultaneously controls the wireless transmission module A to transmit leakage current signals to the wireless transmission module C of the high-sensitivity leakage protection switch;
s14, after the step S13, when the intelligent monitoring module in the high-sensitivity leakage protection switch detects a leakage current signal received by the wireless transmission module C, controlling the early warning system D to send out sound early warning, simultaneously controlling the switch to disconnect a line, and controlling the wireless transmission module C to send leakage current information to an information processing background;
s15, after the step S14, displaying and storing leakage current information by an information processing background;
based on the high sensitivity leakage protection switch:
s21, installing a high-sensitivity leakage protection switch on an indoor power transmission line;
s22, after the step S21, the magnetic modulation transformer coil collects leakage current in the power transmission line in real time, and when the leakage current occurs, a leakage current signal is collected and transmitted to the intelligent monitoring module;
s23, after the step S22, the intelligent monitoring module receives the electric leakage signal, controls the early warning system D to send out audible and visual alarm, simultaneously controls the switch to disconnect a line, and controls the wireless transmission module C to send electric leakage information to the information processing background;
s24, after the step S23, the information processing background displays and stores leakage current information.
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| CN114113721B (en) * | 2021-12-03 | 2024-03-19 | 江阴众和电力仪表有限公司 | Smart electric meter with electric leakage prompt facility |
| CN114362097A (en) * | 2021-12-27 | 2022-04-15 | 上海贝岭股份有限公司 | High voltage leakage protection circuit and leakage analysis chip |
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