CN107179492B - On-line insulation monitoring type resistive leakage electric fire monitoring and detecting device - Google Patents
On-line insulation monitoring type resistive leakage electric fire monitoring and detecting device Download PDFInfo
- Publication number
- CN107179492B CN107179492B CN201710533497.7A CN201710533497A CN107179492B CN 107179492 B CN107179492 B CN 107179492B CN 201710533497 A CN201710533497 A CN 201710533497A CN 107179492 B CN107179492 B CN 107179492B
- Authority
- CN
- China
- Prior art keywords
- unit
- current
- voltage
- resistive leakage
- monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses an on-line insulation monitoring type resistive electric leakage fire monitoring and detecting device, which comprises: detecting the residual current of a distribution line; performing fast Fourier transform processing on the obtained residual current to obtain the fundamental wave of the residual current and the amplitude and phase of each higher harmonic component; detecting the voltage of a distribution line; performing fast Fourier transform processing on the obtained voltage to obtain the amplitude and phase of the fundamental wave and each higher harmonic component of the voltage; carrying out resistive component separation calculation on the residual current to obtain resistive leakage current in the residual current, and carrying out insulation resistance calculation according to the resistive leakage current and distribution line voltage; displaying resistive leakage current, residual current and insulation resistance of the distribution line; monitoring resistive leakage current of a distribution line in real time; and receiving the resistive leakage current, the residual current and the insulation resistance, and the resistive leakage current during alarming, and displaying and storing in real time. The problem of prior art electric leakage detection's error causes the mistake to report, leaks the warning is solved.
Description
Technical Field
The invention relates to the technical field of disaster prevention, in particular to an on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device.
Background
With the rapid development of national economy and the gradual improvement of the living standard of people, the consumption of various electrical equipment and household appliances is increased rapidly, and the electrical fire accident is increased rapidly. Since the nineties of the last century, electrical fires in many areas of the country have been nearly 30% of the total number of fires, locating at the first place of various fires, and causing tremendous losses to national economy and lives and properties of people.
The distribution line and the electrical equipment are subject to leakage due to degradation of insulation performance due to aging or mechanical damage of the line. The insulation breakage easily causes poor insulation or short circuit between the live conductor and the ground, thereby causing electric arcs and electric sparks, wherein the abnormal high temperature of the electric arcs reaches more than 2000 ℃, and when electric leakage electric arcs of hundreds of milliamperes flow into the ground, on one hand, when the electric arcs are contacted with a human body, electric shocks are extremely easy to cause to endanger life safety, and on the other hand, the electric arcs are enough to ignite surrounding combustible materials to cause electric fires, and compared with the common electric wire short circuit, the electric arcs have more harm.
In the prior art, the residual current of the electrical equipment is detected by a current transformer, and the residual current is recorded as resistive leakage current reflecting the insulation condition of a line and is used as the basis of electrical fire monitoring. However, most of wires and cable cores in the power distribution system are aluminum wires or copper wires, so that a distributed capacitance exists in the cable relative to the ground, and the distributed capacitance increases along with the increase of the length and the thickness of the wires, so that when the leakage detection is performed, the obtained residual current data also comprises normal leakage current caused by the distributed capacitance besides resistive leakage current, and the detection precision of the resistive leakage current is affected. Since the normal leakage current does not cause an electrical fire, it is not scientific to directly consider the detected residual current as the basis for the detection of an electrical fire.
Therefore, the online insulation monitoring type resistive leakage electric fire monitoring and detecting device solves the problems that in the prior art, detection errors caused by leakage conditions of a power distribution system are detected through residual current, so that the accuracy of leakage detection is affected, false alarm and leakage alarm are caused, and the problems to be solved in the field are urgent.
Disclosure of Invention
In view of the above, the invention provides an on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device, which solves the problems of false alarm and leakage alarm caused by the detection error caused by the leakage condition of a distribution system detected by residual current in the prior art, thereby affecting the accuracy of leakage detection
In order to solve the technical problems, the invention provides an on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device for monitoring a distribution line, which comprises: the system comprises a detection module and a monitoring module, wherein;
the detection module comprises: the device comprises a current detection unit, a current digital filtering unit, a voltage detection unit, a voltage digital filtering unit, a signal separation unit, a display unit and an alarm unit, wherein,
the current detection unit is respectively connected with the distribution line and the current digital filtering unit and is used for detecting residual current of the distribution line through a current transformer and forming original waveform sampling data of the residual current, wherein the current detection unit comprises at least one current transformer, and the residual current comprises resistive leakage current representing insulation performance; transmitting the original waveform sampling data of the residual current to the current digital filtering unit;
The current digital filtering unit is respectively connected with the current detection unit, the signal separation unit and the display unit and is used for performing fast Fourier transform processing on the obtained residual current to obtain the amplitude and the phase of fundamental wave and each higher harmonic component of the residual current, and transmitting various component information of the residual current after pretreatment to the signal separation unit; simultaneously filtering, namely filtering signals of interference wave bands to obtain filtered residual current, and transmitting the filtered residual current to the display unit;
the voltage detection unit is respectively connected with the distribution line and the voltage digital filtering unit and is used for detecting the voltage of the distribution line, acquiring the waveform of the voltage and forming the original waveform sampling data of the voltage; transmitting the original waveform sample data of the voltage to the voltage digital filtering unit;
the voltage digital filtering unit is respectively connected with the voltage detection unit and the signal separation unit and is used for performing fast Fourier transform processing on the obtained voltage to respectively obtain the amplitude and the phase of fundamental wave and each higher harmonic component of the voltage, and transmitting various component information of the preprocessed voltage to the signal separation unit;
The signal separation unit is respectively connected with the current digital filtering unit, the voltage digital filtering unit and the display unit and is used for carrying out resistive component separation calculation on the residual current according to the amplitude and phase relation of the residual current and the voltage under each frequency after being processed by fast Fourier transform to obtain the resistive leakage current in the residual current, and simultaneously carrying out insulation resistance calculation on the distribution line according to the resistive leakage current and the distribution line voltage to transmit the resistive leakage current and the insulation resistance to the display unit;
the display unit is respectively connected with the current digital filtering unit, the signal separation unit and the monitoring module and is used for displaying the resistive leakage current, the residual current and the insulation resistance of the distribution line and transmitting the resistive leakage current, the residual current and the insulation resistance to the monitoring module;
the alarm unit is respectively connected with the display unit and the monitoring module and is used for monitoring the resistive leakage current of the distribution line in real time, and when the resistive leakage current is smaller than a predefined leakage threshold value, the alarm unit does not work; when the resistive leakage current is larger than or equal to a predefined leakage threshold value, an audible and visual alarm signal is sent out by an alarm lamp corresponding to the distribution line, and meanwhile, the display unit displays the resistive leakage current during alarm and transmits the resistive leakage current during alarm to the monitoring module;
The monitoring module is respectively connected with the display unit and the alarm unit and is used for receiving the resistive leakage current, the residual current and the insulation resistance sent by the display unit and the resistive leakage current sent by the alarm unit during alarm, and displaying and storing the resistive leakage current in real time.
Further, the detection module further includes: a failure detection unit, wherein,
the fault detection unit is respectively connected with the current detection unit and the monitoring module, and is used for receiving a fault detection instruction sent by the monitoring module, monitoring the current transformer in real time according to the fault detection instruction, and when the current transformer is normal, extinguishing a fault indicator corresponding to the current transformer; when the current transformer is abnormal, a fault indicator lamp corresponding to the current transformer is on, and meanwhile, the address of the abnormal current transformer is transmitted to the monitoring module.
Further, the detection module further includes: a communication unit, wherein,
the communication unit is connected with the monitoring module and used for monitoring the connection state of the detection module and the monitoring module in real time, and when the detection module is connected with the monitoring module, the communication unit works normally; when the detection module is disconnected from the monitoring module, the communication unit transmits the address of the disconnected detection module to the monitoring module.
Further, the detection module further includes: a signal transmission unit, wherein,
the signal transmission unit is respectively connected with the display unit, the alarm unit, the fault detection unit, the communication unit and the monitoring module, and is used for receiving the resistive leakage current, the residual current and the insulation resistance sent by the display unit, the resistive leakage current during alarm sent by the alarm unit, the address of the abnormal current transformer sent by the fault detection unit and the address of the disconnected detection module sent by the communication unit, and sending the information to the monitoring module.
Further, the monitoring module includes: the device comprises a signal receiving unit, a display storage unit, an alarm threshold input unit and an instruction transmitting unit, wherein,
the signal receiving unit is respectively connected with the signal transmitting unit and the display storage unit, and is used for receiving the resistive leakage current, the residual current, the insulation resistance, the resistive leakage current during alarming, the address of the abnormal current transformer and the address of the disconnected detection module transmitted by the signal transmitting unit, and transmitting the information to the display storage unit;
The display storage unit is connected with the signal receiving unit and used for displaying and storing all data signals received by the signal receiving unit in real time;
the alarm threshold input unit is connected with the alarm unit and is used for inputting the predefined leakage threshold and transmitting the input predefined leakage threshold to the alarm unit;
the instruction sending unit is connected with the fault detection unit and used for sending a fault detection instruction to the fault detection unit.
Compared with the prior art, the on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device has the following beneficial effects:
(1) The on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device provided by the invention utilizes technologies such as fast Fourier transform analysis and resistive signal separation to monitor pure resistive leakage currents of a plurality of distribution lines in real time through the detector, and takes the resistive leakage currents as reference indexes for preventing electric fires, so that the accuracy of electric fire monitoring is further ensured, and the problems that the existing residual current type electric fire monitor is poor in leakage detection accuracy, false alarm and leakage alarm due to the influence of the capacitive normal leakage currents, and the electric fires cannot be prevented in place are avoided.
(2) According to the on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device, the acquired current signals are subjected to filtering treatment through the digital filtering technology, and signals with interference wave bands are timely filtered, so that the accuracy of resistive leakage current detected by a detector is further ensured, and the detector of the monitoring device can be suitable for various noisy working environments.
(3) According to the on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device, the insulation resistance of the distribution line is calculated through the pure resistive leakage current and the monitoring voltage monitored by the detector, so that the real-time on-line insulation resistance monitoring is realized, and the problems that the existing insulation resistance detection technology needs to be subjected to outage detection, the on-line monitoring cannot be realized, the insulation states of load equipment and the distribution line cannot be detected during outage detection, potential safety hazards exist, the operation is difficult, the detection cost is high and the like are avoided.
(4) According to the on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device, the resistive leakage current of the distribution line is monitored in real time through the alarm unit, and when the resistive leakage current of any path is larger than the predefined leakage threshold value, the alarm unit immediately sends out an alarm signal, so that workers can timely find out the leakage direction and the resistive leakage current, corresponding precautions can be quickly made, fire caused by insulation degradation of the distribution line is effectively avoided, life safety of people is guaranteed to the greatest extent, and property loss is reduced or avoided.
Of course, it is not necessary for any one product embodying the invention to achieve all of the technical effects described above at the same time.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of an on-line insulation monitoring type resistive leakage electrical fire monitoring and detecting device according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of an on-line insulation monitoring type resistive leakage electrical fire monitoring and detecting device in embodiment 2 of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Example 1
As shown in fig. 1, the apparatus is used for monitoring a distribution line 100, and includes: a detection module 10 and a monitoring module 11, wherein;
the detection module 10 comprises: a current detection unit 101, a current digital filtering unit 102, a voltage detection unit 103, a voltage digital filtering unit 104, a signal separation unit 105, a display unit 106, and an alarm unit 107, wherein,
according to the embodiment, the detectors can be arranged on the low-voltage distribution box, the resistive leakage current of the AC220V/380V distribution line can be detected on line, electric fire caused by leakage due to ground faults can be effectively prevented, each detector can detect the insulation state of at least one distribution line at the same time, and when the resistive leakage current of any path is larger than a leakage alarm threshold value, the detector immediately sends an alarm signal to indicate the leakage direction and display the leakage size. The invention implements leakage alarm by detecting the pure resistive leakage current of the distribution line. The electric leakage detection precision is far higher than that of a residual current type monitoring detector, and the measurement precision and reliability of the electric fire monitoring device are further improved.
The current detection unit 101 is respectively connected with the distribution line 100 and the current digital filtering unit 102, and is configured to detect a residual current of the distribution line through a current transformer, and form original waveform sampling data of the residual current, where the current detection unit includes at least one current transformer, and the residual current includes a resistive leakage current representing insulation performance; the raw waveform sample data of the residual current is transferred to the current digital filtering unit 102.
In this embodiment, the detection module may be connected to at least one current transformer at the same time, and each current transformer is used to detect a residual current of one distribution line.
The current transformer comprises a closed iron core and a winding, and is sleeved in a distribution line, residual current in the distribution line is detected by electromagnetic induction, and the residual current comprises: resistive leakage current and normal leakage current, wherein the resistive leakage current is generated by the degradation of insulation or mechanical damage of a line, so that the insulation performance of the line is reduced, and the resistive leakage current is a main cause of electric fire; leakage current is generated by the distributed capacitance generated by the metal wires and the cable cores of the distribution lines, but the leakage current does not cause electric fire. Therefore, in this embodiment, the original waveform sampling data of the residual current is measured by the current transformer, the residual current is calculated in the later stage, the resistive leakage current is obtained, and the resistive leakage current is used as the monitoring parameter of the electrical fire, so that the accurate monitoring of the electrical fire is further improved.
In this embodiment, the current transformer can use the opposite plug-in current transformer, also can use the through-type current transformer, and wherein, the opposite plug-in current transformer is open structure, and the installation is dismantled extremely conveniently, can install under the state of continuous line, convenient and fast. The device is applicable to the installation and detection of single-phase two-wire distribution lines, three-phase circuits and the like, has a wide application range, and has higher accuracy in measuring current and phase.
In some machine equipment working on the frequency conversion principle, high-order harmonic components often exist to the ground due to the working principle, and the high-order harmonic components can cause the capacitance resistance of the distributed capacitors in the distribution circuit and the motor shell to be reduced based on the characteristics of high frequency resistance and low frequency resistance of the capacitor, so that the leakage current of a wiring system is overlarge; the high-frequency noise signals generated by the load can influence the normal operation of some equipment, in order to filter high-frequency noise components in a circuit in the power supply of some precision equipment (such as a computer), high-voltage capacitance to ground is often connected between the electrical equipment and the ground for discharging, but the high-frequency components are filtered, and meanwhile, the component of the capacitive leakage current in the electrical equipment is obviously increased.
The current digital filtering unit 102 is connected to the current detecting unit 101, the signal separating unit 105 and the display unit 106, and is configured to perform a fast fourier transform process on the obtained residual current to obtain an amplitude and a phase of a fundamental wave and each harmonic component of the residual current, transmit various component information of the residual current after preprocessing to the signal separating unit 105, perform a filtering process at the same time, filter a signal of an interference band, obtain the filtered residual current, and transmit the filtered residual current to the display unit 106.
Fast fourier transform (Fast Fourier Transform, FFT), a generic term for efficient, fast computing methods that utilize computer to compute discrete fourier transforms. The required calculation times are greatly reduced, particularly, the more the number of the converted sampling points N is, the more the calculation amount of the FFT algorithm is remarkably saved, and the calculation efficiency is greatly improved. In this embodiment, most of the residual current signals detected by the current transformer are superimposed with interference waves of different frequencies on the basis of one fundamental wave, and the focus of fourier change is to separate the detected fundamental wave and higher harmonics of different frequencies one by one in the integrated waveform, so as to obtain the amplitude and phase of each frequency waveform.
The voltage detection unit 103 is connected with the distribution line 100 and the voltage digital filtering unit 104 respectively, and is used for detecting the voltage of the distribution line, obtaining the waveform of the voltage, and forming the original waveform sampling data of the voltage; the raw waveform sample data of the voltage is transferred to the voltage digital filtering unit 104.
In this embodiment, the distribution lines are all connected in a three-phase circuit, and the voltage detecting unit is connected with the distribution lines to monitor the voltage variation of the distribution lines in real time, so as to obtain the original waveform sampling data of the voltage.
The voltage digital filtering unit 104 is respectively connected with the voltage detecting unit 103 and the signal separating unit 105, and is configured to perform fast fourier transform processing on the obtained voltage, obtain the amplitude and the phase of the fundamental wave and each higher harmonic component of the voltage, and transmit the preprocessed information of each component of the voltage to the signal separating unit 105.
In this embodiment, most of the voltage signals detected by the voltage detection unit are superimposed with interference waves of different frequencies on the basis of one fundamental wave, and the focus of fourier change is to separate the detected fundamental wave and higher harmonics of different frequencies one by one in the integrated waveform, so as to obtain the amplitude and phase of each frequency waveform. The signal separation unit 105 is respectively connected to the current digital filtering unit 102, the voltage digital filtering unit 104 and the display unit 106, and is configured to perform resistive component separation calculation on the residual current according to the amplitude and the phase relationship of the residual current and the voltage at each frequency after the fast fourier transform processing, to obtain the resistive leakage current in the residual current, and perform insulation resistance calculation on the distribution line according to the resistive leakage current and the distribution line voltage, and to transmit the resistive leakage current and the insulation resistance to the display unit 106.
The display unit 106 is respectively connected to the current digital filtering unit 102, the signal separation unit 105 and the monitoring module 11, and is configured to display the resistive leakage current, the residual current and the insulation resistance of the distribution line, and transmit the resistive leakage current, the residual current and the insulation resistance to the monitoring module 11.
The display unit is provided with a selection key, and the data of the residual current and the resistive leakage current of the distribution line can be checked at any time by operating the selection key. For example, when the detector is connected with four current transformers, the detector can detect the residual current of four groups of distribution lines, the resistive leakage current and the data of leakage threshold values at the same time, when a residual current key is selected, the residual current values of the four distribution lines are sequentially displayed on the nixie tube of the display unit, and similarly, when the resistive leakage current key is selected, the resistive leakage current of the four distribution lines is sequentially displayed on the nixie tube of the display unit.
The alarm unit 107 is respectively connected with the display unit 106 and the monitoring module 11, and is used for monitoring the resistive leakage current of the distribution line in real time, and when the resistive leakage current is smaller than a predefined leakage threshold value, the alarm unit does not work; when the resistive leakage current is greater than or equal to a predefined leakage threshold, an audible and visual alarm signal is sent out by an alarm lamp corresponding to the distribution line, and meanwhile, the display unit displays the resistive leakage current during alarm and transmits the resistive leakage current during alarm to the monitoring module 11.
When the value of the resistive leakage current is greater than or equal to a predefined leakage threshold value, the alarm unit can send out an audible and visual alarm signal in 60S, so that workers can find the leakage direction and the resistive leakage current in time, corresponding precautionary measures can be quickly made, fire disasters caused by insulation degradation of distribution lines are effectively avoided, the life safety of people is guaranteed to the greatest extent, and property loss is reduced or avoided.
The monitoring module 11 is respectively connected with the display unit 106 and the alarm unit 107, and is configured to receive the resistive leakage current, the residual current, the insulation resistance sent by the display unit, and the resistive leakage current sent by the alarm unit during alarm, and display and store the resistive leakage current in real time.
In a specific embodiment, the monitoring module may be a touch screen wall-mounted device or an industrial computer monitoring device. The touch screen wall-mounted machine is provided with four loops, each loop can be connected with 63 detectors, and each detector can be connected with 8 current transformers, so that one wall-mounted machine can detect the insulation state of 4 x 63 x 8 distribution lines at the same time; an industrial computer monitoring device can be connected with 470 detectors simultaneously to monitor the insulation state of 470 x 8 distribution lines.
Example 2
As shown in fig. 2, the apparatus is used for monitoring a distribution line 200, and includes: a detection module 20 and a monitoring module 21, wherein;
the detection module 20 includes: a current detection unit 201, a current digital filtering unit 202, a voltage detection unit 203, a voltage digital filtering unit 204, a signal separation unit 205, a display unit 206, an alarm unit 207, a fault detection unit 208, a communication unit 209, and a signal transmission unit 210, wherein,
according to the embodiment, the detectors can be arranged on the low-voltage distribution box, the resistive leakage current of the AC220V/380V distribution line can be detected on line, electric fire caused by leakage due to ground faults can be effectively prevented, each detector can detect the insulation state of at least one distribution line at the same time, and when the resistive leakage current of any path is larger than a leakage alarm threshold value, the detector immediately sends an alarm signal to indicate the leakage direction and display the leakage size. The invention implements leakage alarm by detecting the pure resistive leakage current of the distribution line. The electric leakage detection precision is far higher than that of a residual current type monitoring detector, and the measurement precision and reliability of the electric fire monitoring device are further improved.
The current detection unit 201 is respectively connected with the distribution line 200 and the current digital filtering unit 202, and is configured to detect a residual current of the distribution line through a current transformer, and form original waveform sampling data of the residual current, where the current detection unit includes at least one current transformer, and the residual current includes a resistive leakage current representing insulation performance; the raw waveform sample data of the residual current is transferred to the current digital filtering unit 202.
In this embodiment, the detection module may be connected to at least one current transformer at the same time, and each current transformer is used to detect a residual current of one distribution line.
The current transformer comprises a closed iron core and a winding, and is sleeved in a distribution line, residual current in the distribution line is detected by utilizing an electromagnetic induction principle, and the residual current comprises: resistive leakage current and normal leakage current, wherein the resistive leakage current is generated by the degradation of insulation or mechanical damage of a line, so that the insulation performance of the line is reduced, and the resistive leakage current is a main cause of electric fire; leakage current is generated by the distributed capacitance generated by the metal wires and the cable cores of the distribution lines, but the leakage current does not cause electric fire. Therefore, in this embodiment, the original waveform sampling data of the residual current is measured by the current transformer, the residual current is calculated in the later stage, the resistive leakage current is obtained, and the resistive leakage current is used as the monitoring parameter of the electrical fire, so that the accurate monitoring of the electrical fire is further improved.
In this embodiment, the current transformer can use the opposite plug-in current transformer, also can use the through-type current transformer, and wherein, the opposite plug-in current transformer is open structure, and the installation is dismantled extremely conveniently, can install under the state of continuous line, convenient and fast. The device is applicable to the installation and detection of single-phase two-wire distribution lines, three-phase circuits and the like, has a wide application range, and has higher accuracy in measuring current and phase.
In some machine equipment working on the frequency conversion principle, high-order harmonic components often exist to the ground due to the working principle, and the high-order harmonic components can cause the capacitance resistance of the distributed capacitors in the distribution circuit and the motor shell to be reduced based on the characteristics of high frequency resistance and low frequency resistance of the capacitor, so that the leakage current of a wiring system is overlarge; the high-frequency noise signals generated by the load can influence the normal operation of some equipment, in order to filter high-frequency noise components in a circuit in the power supply of some precision equipment (such as a computer), high-voltage capacitance to ground is often connected between the electrical equipment and the ground for discharging, but the high-frequency components are filtered, and meanwhile, the component of the capacitive leakage current in the electrical equipment is obviously increased.
The current digital filtering unit 202 is connected to the current detecting unit 201, the signal separating unit 205 and the display unit 206, and is configured to perform a fast fourier transform process on the obtained residual current to obtain an amplitude and a phase of a fundamental wave and each harmonic component of the residual current, transmit various component information of the residual current after preprocessing to the signal separating unit 205, perform a filtering process at the same time, filter a signal of an interference band, obtain the filtered residual current, and transmit the filtered residual current to the display unit 206.
In this embodiment, most of the residual current signals detected by the current transformer are superimposed with interference waves of different frequencies on the basis of one fundamental wave, and the focus of fourier change is to separate the detected fundamental wave and higher harmonics of different frequencies one by one in the integrated waveform, so as to obtain the amplitude and phase of each frequency waveform. The voltage detection unit 203 is connected to the distribution line 200 and the voltage digital filtering unit 204, and is configured to detect a voltage of the distribution line, obtain a waveform of the voltage, and form original waveform sampling data of the voltage; the raw waveform sample data of the voltage is transferred to the voltage digital filtering unit 204.
In this embodiment, the distribution lines are all connected in a three-phase circuit, and the voltage detecting unit is connected with the distribution lines to monitor the voltage variation of the distribution lines in real time, so as to obtain the original waveform sampling data of the voltage.
The voltage digital filtering unit 204 is connected to the voltage detecting unit 203 and the signal separating unit 205, and is configured to perform a fast fourier transform process on the obtained voltage, obtain the amplitude and the phase of the fundamental wave and each harmonic component of the voltage, and transmit the preprocessed information of each component of the voltage to the signal separating unit 205.
In this embodiment, most of the voltage signals detected by the voltage detection unit are superimposed with interference waves of different frequencies on the basis of one fundamental wave, and the focus of fourier change is to separate the detected fundamental wave and higher harmonics of different frequencies one by one in the integrated waveform, so as to obtain the amplitude and phase of each frequency waveform.
The signal separation unit 205 is respectively connected to the current digital filtering unit 202, the voltage digital filtering unit 204 and the display unit 206, and is configured to perform resistive component separation calculation on the residual current according to the amplitude and phase relationship of the residual current and the voltage at each frequency after the fast fourier transform processing, to obtain the resistive leakage current in the residual current, and perform insulation resistance calculation on the distribution line according to the resistive leakage current and the distribution line voltage, and to transmit the resistive leakage current and the insulation resistance to the display unit 206.
The display unit 206 is respectively connected to the current digital filtering unit 202, the signal separation unit 205, the alarm unit 207, and the signal transmission unit 210, and is configured to display the resistive leakage current, the residual current, and the insulation resistance of the distribution line, and transmit the resistive leakage current, the residual current, and the insulation resistance to the signal transmission unit 210.
The display unit is provided with a selection key, and the data of the residual current and the resistive leakage current of the distribution line can be checked at any time by operating the selection key. For example, when the detector is connected with four current transformers, the detector can detect the residual current of four groups of distribution lines, the resistive leakage current and the data of leakage threshold values at the same time, when a residual current key is selected, the residual current values of the four distribution lines are sequentially displayed on the nixie tube of the display unit, and similarly, when the resistive leakage current key is selected, the resistive leakage current of the four distribution lines is sequentially displayed on the nixie tube of the display unit.
The alarm unit 207 is respectively connected to the display unit 206, the signal transmission unit 210, and the monitoring module 21, and is configured to monitor the resistive leakage current of the distribution line in real time, and when the resistive leakage current is less than a predefined leakage threshold, the alarm unit does not work; when the resistive leakage current is greater than or equal to a predefined leakage threshold, an audible and visual alarm signal is emitted by an alarm lamp corresponding to the distribution line, and the display unit displays the resistive leakage current during alarm and transmits the resistive leakage current during alarm to the signal transmission unit 210.
When the value of the resistive leakage current is greater than or equal to a predefined leakage threshold value, the alarm unit can send out an audible and visual alarm signal in 60S, so that workers can find the leakage direction and the resistive leakage current in time, corresponding precautionary measures can be quickly made, fire disasters caused by insulation degradation of distribution lines are effectively avoided, the life safety of people is guaranteed to the greatest extent, and property loss is reduced or avoided.
The fault detection unit 208 is respectively connected with the current detection unit 201, the signal transmission unit 210 and the monitoring module 21, and is configured to receive a fault detection instruction sent by the monitoring module, monitor the current transformer in real time according to the fault detection instruction, and turn off a fault indicator corresponding to the current transformer when the current transformer is normal; when the current transformer is abnormal, a fault indication lamp corresponding to the current transformer is turned on, and simultaneously, an address of the abnormal current transformer is transmitted to the signal transmission unit 210.
When the current transformer is abnormal, the fault indicator lights and timely sends the address of the abnormal current transformer to the monitoring module through the signal transmission unit, so that workers can timely find the problem of the current detection unit on site or remotely, and can timely maintain or replace the current detection unit, thereby not affecting the normal operation of the monitoring work of the wiring line.
The communication unit 209 is connected to the signal transmission unit 210, and is configured to monitor a connection state of the detection module and the monitoring module in real time, and when the detection module is connected to the monitoring module, the communication unit works normally; when the detection module is disconnected from the monitoring module, the communication unit transmits the address of the disconnected detection module to the signal transmission unit 210.
The problem of whether disconnection occurs between the detection module and the monitoring module is monitored in real time, so that a worker can judge the disconnection in time and further find the reason of the disconnection: broken wires, short circuits or faults of equipment, and the like, so that the monitoring device is convenient for workers to maintain in time, and continuous and effective performance of the monitoring device is ensured.
The signal transmission unit 210 is respectively connected to the display unit 206, the alarm unit 207, the fault detection unit 208, the communication unit 209, and the monitoring module 21, and is configured to receive the resistive leakage current, the residual current, and the insulation resistance sent by the display unit, the resistive leakage current during the alarm sent by the alarm unit, the address of the abnormal current transformer sent by the fault detection unit, and the address of the disconnected detection module sent by the communication unit, and send the information to the monitoring module 21.
The detector is connected with the monitor through the detector wiring terminal, and data and information detected by the detector are transmitted to the monitor through the wiring terminal, so that the monitor can monitor the detector in real time.
The monitoring module 21 includes: a signal receiving unit 211, a display storage unit 212, an alarm threshold value input unit 213, and an instruction transmitting unit 214, wherein,
the signal receiving unit 211 is connected to the signal transmitting unit 210 and the display storage unit 212, and is configured to receive the resistive leakage current, the residual current, the insulation resistance, the resistive leakage current during alarm, the address of the abnormal current transformer, and the address of the disconnected detection module, which are transmitted by the signal transmitting unit, and transmit the information to the display storage unit 212.
The display storage unit 212 is connected to the signal receiving unit 211, and is configured to display and store all data signals received by the signal receiving unit in real time.
The monitoring module of this embodiment can set up in the control room, through transmitting the detection data of each detector to the display panel of monitoring module, makes the staff also can the remote monitoring in the control room the operating condition of the many detectors that are connected with the monitor and the insulating state of each distribution lines, when meetting the problem, can in time make the protection processing. All data are stored in time, so that later-stage data can be conveniently fetched and queried.
The alarm threshold value input unit 213 is connected to the alarm unit 207, and is configured to input a predefined leakage threshold value, and transmit the input predefined leakage threshold value to the alarm unit 207.
The instruction sending unit 214 is connected to the fault detection unit 208, and is configured to send a fault detection instruction to the fault detection unit.
Once the device equipment is installed, all distribution lines connected with the device equipment can be monitored in real time, and staff only need to monitor the insulation state of each distribution line in a monitoring room remotely and can perform fault detection at any time, so that the existence of the existing insulation resistance detection technology is avoided: the insulation state of the load equipment and the distribution line can not be detected during the power failure detection, potential safety hazards exist, the operation is difficult, the detection cost is high and the like, and the installation and maintenance cost of the equipment is greatly reduced. The monitoring device of the embodiment can be used for places with dense personnel, entertainment places, large buildings and high electrical fire risks.
According to the embodiment, the online insulation monitoring type resistive leakage electric fire monitoring and detecting device has the following beneficial effects:
(1) The on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device provided by the invention utilizes technologies such as fast Fourier transform analysis and resistive signal separation to monitor pure resistive leakage currents of a plurality of distribution lines in real time through the detector, and takes the resistive leakage currents as reference indexes for preventing electric fires, so that the accuracy of electric fire monitoring is further ensured, and the problems that the existing residual current type electric fire monitor is poor in leakage detection accuracy, false alarm and leakage alarm due to the influence of the capacitive normal leakage currents, and the electric fires cannot be prevented in place are avoided.
(2) According to the on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device, the acquired current signals are subjected to filtering treatment through the digital filtering technology, and signals with interference wave bands are timely filtered, so that the accuracy of resistive leakage current detected by a detector is further ensured, and the detector of the monitoring device can be suitable for various noisy working environments.
(3) According to the on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device, the insulation resistance of the distribution line is calculated through the pure resistive leakage current and the monitoring voltage monitored by the detector, so that the real-time on-line insulation resistance monitoring is realized, and the problems that the existing insulation resistance detection technology needs to be subjected to outage detection, the on-line monitoring cannot be realized, the insulation states of load equipment and the distribution line cannot be detected during outage detection, potential safety hazards exist, the operation is difficult, the detection cost is high and the like are avoided.
(4) According to the on-line insulation monitoring type resistive leakage electric fire monitoring and detecting device, the resistive leakage current of the distribution line is monitored in real time through the alarm unit, and when the resistive leakage current of any path is larger than the predefined leakage threshold value, the alarm unit immediately sends out an alarm signal, so that workers can timely find out the leakage direction and the resistive leakage current, corresponding precautions can be quickly made, fire caused by insulation degradation of the distribution line is effectively avoided, life safety of people is guaranteed to the greatest extent, and property loss is reduced or avoided.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (1)
1. The utility model provides an on-line insulation monitoring type resistive electric leakage electric fire monitoring detection device for distribution lines's monitoring, its characterized in that includes: the system comprises a detection module and a monitoring module, wherein;
the detection module comprises: the device comprises a current detection unit, a current digital filtering unit, a voltage detection unit, a voltage digital filtering unit, a signal separation unit, a display unit and an alarm unit, wherein,
the current detection unit is respectively connected with the distribution line and the current digital filtering unit and is used for detecting residual current of the distribution line through a current transformer and forming original waveform sampling data of the residual current, wherein the current detection unit comprises at least one current transformer, and the residual current comprises resistive leakage current representing insulation performance; transmitting the original waveform sampling data of the residual current to the current digital filtering unit;
the current digital filtering unit is respectively connected with the current detection unit, the signal separation unit and the display unit and is used for performing fast Fourier transform processing on the obtained residual current to obtain the amplitude and the phase of fundamental wave and each higher harmonic component of the residual current, and transmitting various component information of the residual current after pretreatment to the signal separation unit; simultaneously filtering, namely filtering signals of interference wave bands to obtain filtered residual current, and transmitting the filtered residual current to the display unit;
The voltage detection unit is respectively connected with the distribution line and the voltage digital filtering unit and is used for detecting the voltage of the distribution line, acquiring the waveform of the voltage and forming the original waveform sampling data of the voltage; transmitting the original waveform sample data of the voltage to the voltage digital filtering unit;
the voltage digital filtering unit is respectively connected with the voltage detection unit and the signal separation unit and is used for performing fast Fourier transform processing on the obtained voltage to respectively obtain the amplitude and the phase of fundamental wave and each higher harmonic component of the voltage, and transmitting various component information of the preprocessed voltage to the signal separation unit;
the signal separation unit is respectively connected with the current digital filtering unit, the voltage digital filtering unit and the display unit and is used for carrying out resistive component separation calculation on the residual current according to the amplitude and phase relation of the residual current and the voltage under each frequency after being processed by fast Fourier transform to obtain the resistive leakage current in the residual current, and simultaneously carrying out insulation resistance calculation on the distribution line according to the resistive leakage current and the distribution line voltage to transmit the resistive leakage current and the insulation resistance to the display unit;
The display unit is respectively connected with the current digital filtering unit, the signal separation unit and the monitoring module and is used for displaying the resistive leakage current, the residual current and the insulation resistance of the distribution line and transmitting the resistive leakage current, the residual current and the insulation resistance to the monitoring module;
the alarm unit is respectively connected with the display unit and the monitoring module and is used for monitoring the resistive leakage current of the distribution line in real time, and when the resistive leakage current is smaller than a predefined leakage threshold value, the alarm unit does not work; when the resistive leakage current is larger than or equal to a predefined leakage threshold value, an audible and visual alarm signal is sent out by an alarm lamp corresponding to the distribution line, and meanwhile, the display unit displays the resistive leakage current during alarm and transmits the resistive leakage current during alarm to the monitoring module;
the monitoring module is respectively connected with the display unit and the alarm unit and is used for receiving the resistive leakage current, the residual current and the insulation resistance sent by the display unit and the resistive leakage current sent by the alarm unit during alarm, and displaying and storing the resistive leakage current in real time;
The detection module further comprises: a failure detection unit, wherein,
the fault detection unit is respectively connected with the current detection unit and the monitoring module, and is used for receiving a fault detection instruction sent by the monitoring module, monitoring the current transformer in real time according to the fault detection instruction, and when the current transformer is normal, extinguishing a fault indicator corresponding to the current transformer; when the current transformer is abnormal, a fault indicator lamp corresponding to the current transformer is on, and the address of the abnormal current transformer is transmitted to the monitoring module;
the detection module further comprises: a communication unit, wherein,
the communication unit is connected with the monitoring module and used for monitoring the connection state of the detection module and the monitoring module in real time, and when the detection module is connected with the monitoring module, the communication unit works normally; when the detection module is disconnected with the monitoring module, the communication unit transmits the address of the disconnected detection module to the monitoring module;
the detection module further comprises: a signal transmission unit, wherein,
The signal transmission unit is respectively connected with the display unit, the alarm unit, the fault detection unit, the communication unit and the monitoring module, and is used for receiving the resistive leakage current, the residual current and the insulation resistance sent by the display unit, the resistive leakage current during alarm sent by the alarm unit, the address of the abnormal current transformer sent by the fault detection unit and the address of the disconnected detection module sent by the communication unit, and sending the information to the monitoring module;
the monitoring module further comprises: the device comprises a signal receiving unit, a display storage unit, an alarm threshold input unit and an instruction transmitting unit, wherein,
the signal receiving unit is respectively connected with the signal transmitting unit and the display storage unit, and is used for receiving the resistive leakage current, the residual current, the insulation resistance, the resistive leakage current during alarming, the address of the abnormal current transformer and the address of the disconnected detection module transmitted by the signal transmitting unit, and transmitting the information to the display storage unit;
The display storage unit is connected with the signal receiving unit and used for displaying and storing all data signals received by the signal receiving unit in real time;
the alarm threshold input unit is connected with the alarm unit and is used for inputting the predefined leakage threshold and transmitting the input predefined leakage threshold to the alarm unit;
the instruction sending unit is connected with the fault detection unit and used for sending a fault detection instruction to the fault detection unit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710533497.7A CN107179492B (en) | 2017-07-03 | 2017-07-03 | On-line insulation monitoring type resistive leakage electric fire monitoring and detecting device |
| PCT/CN2018/092847 WO2019007230A1 (en) | 2017-07-03 | 2018-06-26 | Online insulation monitoring type resistive electric leakage fire monitoring and detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710533497.7A CN107179492B (en) | 2017-07-03 | 2017-07-03 | On-line insulation monitoring type resistive leakage electric fire monitoring and detecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107179492A CN107179492A (en) | 2017-09-19 |
| CN107179492B true CN107179492B (en) | 2023-10-13 |
Family
ID=59846165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710533497.7A Active CN107179492B (en) | 2017-07-03 | 2017-07-03 | On-line insulation monitoring type resistive leakage electric fire monitoring and detecting device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107179492B (en) |
| WO (1) | WO2019007230A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109345752A (en) * | 2018-12-05 | 2019-02-15 | 合肥能安科技有限公司 | A kind of electrical safety monitoring and pre-alarming method and device |
| CN109856509B (en) * | 2018-12-11 | 2021-08-17 | 西安华瑞网电科技股份有限公司 | Effectively-grounded three-phase insulation type electric fire online prevention and control device and method |
| CN110060445B (en) * | 2019-05-20 | 2020-08-18 | 北京航天常兴科技发展股份有限公司 | Method for preventing electric leakage false alarm, electric fire monitoring detector and monitoring system |
| CN110264659B (en) * | 2019-05-22 | 2024-03-01 | 应急管理部沈阳消防研究所 | Composite electric fire monitoring detector and monitoring method thereof |
| CN110261659B (en) * | 2019-07-29 | 2024-07-02 | 西安石油大学 | Leakage current monitoring system and method for submersible electric pump unit |
| CN110730234A (en) * | 2019-10-16 | 2020-01-24 | 南京苏瑞科技实业有限公司 | Electrical fire monitoring system and intelligent early warning analysis method thereof |
| CN111796205B (en) * | 2020-07-08 | 2023-05-05 | 安徽先兆科技有限公司 | AC220V loop electric safety control method and system |
| CN113884802A (en) * | 2021-08-13 | 2022-01-04 | 东莞市耀晟汽车配件有限公司 | Method and device for improving power failure reliability |
| CN113721065B (en) * | 2021-08-26 | 2024-06-21 | 安徽南瑞继远电网技术有限公司 | Alternating current data acquisition device for station and acquisition method thereof |
| CN113686389A (en) * | 2021-08-31 | 2021-11-23 | 重庆市三峡水务北碚排水有限责任公司 | Underwater equipment operation monitoring system and method |
| CN113702787A (en) * | 2021-09-15 | 2021-11-26 | 广东电网有限责任公司 | Method and device for detecting insulated wire of low-voltage line |
| CN114062784A (en) * | 2021-11-15 | 2022-02-18 | 广东电网有限责任公司 | Lightning arrester testing device and method and computer storage medium |
| CN114280499A (en) * | 2021-12-21 | 2022-04-05 | 国能榆林能源有限责任公司 | Electric leakage detection method for coal mine underground power supply system and coal mine underground power supply system |
| CN116298689B (en) * | 2023-03-21 | 2024-03-22 | 国网山东省电力公司高唐县供电公司 | Power supply line monitoring device and method |
| CN117269658B (en) * | 2023-11-23 | 2024-02-02 | 江苏安世朗智能科技有限公司 | Intelligent electricity consumption monitor capable of accurately collecting parameters of each line and installation method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2211437A2 (en) * | 2009-01-23 | 2010-07-28 | Mitsubishi Electric Corporation | Earth leakage tester, earth leakage circuit breaker equipped with the same, circuit breaker, and insulation monitor |
| CN102354427A (en) * | 2011-09-27 | 2012-02-15 | 赵怀军 | method and device for flexibly identifying residual current-type electrical fire on line |
| CN202383792U (en) * | 2012-01-07 | 2012-08-15 | 毛振刚 | Electrical fire monitoring detection system |
| CN102855729A (en) * | 2012-08-25 | 2013-01-02 | 于宝成 | Residual current type electric fire monitoring system capable of self-supplying power |
| CN203415061U (en) * | 2013-07-17 | 2014-01-29 | 厦门大恒科技有限公司 | Intelligent electrical fire hazard monitoring device |
| CN103701092A (en) * | 2013-12-18 | 2014-04-02 | 北京恺思维特科技有限责任公司 | Insulation resistance detection and ground protection device of DC electric system |
| CN203759822U (en) * | 2013-06-24 | 2014-08-06 | 郑州金特莱电子有限公司 | Residual electric current type electrical fire hazard monitoring detector |
| CN206920548U (en) * | 2017-07-03 | 2018-01-23 | 北京航天常兴科技发展股份有限公司 | The resistive electric leakage electrical fire monitoring detection device of on-line insulation monitoring formula |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403777B (en) * | 2008-11-05 | 2012-07-04 | 四川电力试验研究院 | Resistive current tester for great current zinc oxide lightning arrester |
| CN101958528B (en) * | 2010-10-18 | 2013-07-03 | 吕纪文 | Leakage protection method and device |
| CN102436226A (en) * | 2011-09-14 | 2012-05-02 | 文存润 | Online monitoring and condition maintenance management system |
| CN202563002U (en) * | 2012-05-04 | 2012-11-28 | 重庆市电力公司市区供电局 | Lightning arrester remote on-line monitoring system |
-
2017
- 2017-07-03 CN CN201710533497.7A patent/CN107179492B/en active Active
-
2018
- 2018-06-26 WO PCT/CN2018/092847 patent/WO2019007230A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2211437A2 (en) * | 2009-01-23 | 2010-07-28 | Mitsubishi Electric Corporation | Earth leakage tester, earth leakage circuit breaker equipped with the same, circuit breaker, and insulation monitor |
| CN102354427A (en) * | 2011-09-27 | 2012-02-15 | 赵怀军 | method and device for flexibly identifying residual current-type electrical fire on line |
| CN202383792U (en) * | 2012-01-07 | 2012-08-15 | 毛振刚 | Electrical fire monitoring detection system |
| CN102855729A (en) * | 2012-08-25 | 2013-01-02 | 于宝成 | Residual current type electric fire monitoring system capable of self-supplying power |
| CN203759822U (en) * | 2013-06-24 | 2014-08-06 | 郑州金特莱电子有限公司 | Residual electric current type electrical fire hazard monitoring detector |
| CN203415061U (en) * | 2013-07-17 | 2014-01-29 | 厦门大恒科技有限公司 | Intelligent electrical fire hazard monitoring device |
| CN103701092A (en) * | 2013-12-18 | 2014-04-02 | 北京恺思维特科技有限责任公司 | Insulation resistance detection and ground protection device of DC electric system |
| CN206920548U (en) * | 2017-07-03 | 2018-01-23 | 北京航天常兴科技发展股份有限公司 | The resistive electric leakage electrical fire monitoring detection device of on-line insulation monitoring formula |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107179492A (en) | 2017-09-19 |
| WO2019007230A1 (en) | 2019-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107179492B (en) | On-line insulation monitoring type resistive leakage electric fire monitoring and detecting device | |
| CN206920548U (en) | The resistive electric leakage electrical fire monitoring detection device of on-line insulation monitoring formula | |
| KR101865086B1 (en) | Fault data analysis, internal abnormality condition monitoring, diagnosis function embedded switchgear with fault monitoring-diagnosis controller | |
| KR101070832B1 (en) | A method for detecting an abnormality of distributing board | |
| KR101303597B1 (en) | A detection device of insulation resistance for non-interruption of electric power and hot-line | |
| CN102540034B (en) | High-voltage transformer bushing tap grounding on-line monitoring device | |
| CN104090230A (en) | Breaker safe operation real-time analysis early warning system | |
| CN203241076U (en) | Distributed online ring main unit monitoring device | |
| CN111999685A (en) | Transformer oil-immersed bushing running state integrated monitoring system | |
| CN104181427A (en) | Online monitoring system of intelligent substation transformer | |
| CN103234576A (en) | State monitoring system for power devices in intelligent substations | |
| CN204214972U (en) | A kind of magnet controlled reactor on-line monitoring system | |
| CN107884645A (en) | Based on voltage ratio compared with power capacitor method for monitoring operation states | |
| CN209446711U (en) | High-tension cable is cross interconnected and insulated on-line monitoring system | |
| CN112665647A (en) | ZigBee-based power grid transformer remote online monitoring system | |
| CN111679163A (en) | On-line insulation monitoring device for turns of dry-type reactor | |
| CN203561722U (en) | Two-frequency signal detection position indicator for electricity overhead line | |
| CN109239547A (en) | A kind of method and device measuring high-tension cable operating status | |
| CN112014695A (en) | GIS equipment fault rapid positioning system and method | |
| CN102570439A (en) | Built-in detection device of surge protector | |
| CN212181599U (en) | Electric line fire early warning terminal | |
| JP3039936B2 (en) | Power line degradation determination method and device | |
| CN212364483U (en) | Quick positioning system of GIS equipment fault | |
| CN209513975U (en) | A kind of authentic partial discharge monitoring device of switchgear | |
| CN112234718A (en) | Intelligent on-line monitoring method and device for switch cabinet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |