CN114660504B - Insulation monitoring loop detection method and device, electronic equipment and storage medium - Google Patents
Insulation monitoring loop detection method and device, electronic equipment and storage medium Download PDFInfo
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- CN114660504B CN114660504B CN202210369379.8A CN202210369379A CN114660504B CN 114660504 B CN114660504 B CN 114660504B CN 202210369379 A CN202210369379 A CN 202210369379A CN 114660504 B CN114660504 B CN 114660504B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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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
- G01R31/54—Testing for continuity
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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
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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Abstract
The invention provides a detection method and device of an insulation monitoring loop, electronic equipment and a storage medium, and relates to the field of power equipment monitoring. The method comprises the steps of obtaining a waveform signal of induced electromotive force of a core-through screw rod, obtaining a resistance value of an insulation resistor, and monitoring a connection state of a loop where the insulation resistor is located based on the waveform signal and the resistance value; therefore, the characteristics of the through-core screw rod with the induced electromotive force are utilized, the induced electromotive force is introduced into the measuring loop, the induced electromotive force is combined with the resistance value of the insulation resistor to detect, and the accurate detection of the connection state of the insulation monitoring loop is realized, so that the insulation monitoring loop can accurately reflect the real condition of the insulation resistor in the process of monitoring the insulation resistor.
Description
Technical Field
The invention relates to the field of insulation monitoring of power equipment, in particular to a detection method and device of an insulation monitoring loop, electronic equipment and a storage medium.
Background
The stator of the generator is formed by stacking a large number of silicon steel sheets, the silicon steel sheets are required to be fixed by the core penetrating screw rod, insulation between the core penetrating screw rod and the silicon steel sheets is required to be ensured, and therefore insulation resistance is required to be installed between the core penetrating screw rod and the silicon steel sheets. In order to ensure the insulation performance of the insulation resistor, the insulation resistor needs to be monitored, and a monitoring loop for monitoring the insulation resistor can generate poor contact, short circuit or open circuit due to the installation quality of equipment, equipment vibration, dust and oil pollution and disturbance in overhaul.
In the prior art, a lead wire is generally used for forming a monitoring loop to measure the resistance value of the insulation resistor in the insulation resistor monitoring process, but the monitoring loop is easily affected by external factors to influence the connection state, and the real condition of the insulation resistor cannot be accurately reflected. For example, in the case where the monitored resistance tends to infinity and an open circuit, the resistance of the insulation resistance is characterized as well, so that the actual condition of the insulation resistance cannot be accurately reflected in the process of monitoring the insulation resistance.
Disclosure of Invention
Based on the above researches, the invention provides a detection method and device for an insulation monitoring loop, an electronic device and a storage medium, which are used for solving the problems.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment of the present invention provides a method for detecting an insulation monitoring loop, where the method includes:
acquiring a waveform signal of induced electromotive force of the core-penetrating screw;
acquiring the resistance value of the insulation resistor;
and detecting the connection state of the insulation monitoring loop based on the waveform signal and the resistance value.
In an alternative embodiment, detecting the connection state of the insulation monitoring loop based on the waveform signal and the resistance value includes:
performing state analysis on the waveform signals to obtain the state types of the waveform signals;
carrying out resistance analysis on the resistance to obtain a resistance state of the resistance;
and detecting the connection state of the insulation monitoring loop according to the state type of the waveform signal and the resistance state of the resistance.
In an alternative embodiment, detecting the connection state of the insulation monitoring loop according to the state type to which the waveform signal belongs and the resistance state to which the resistance belongs includes:
if the state type of the waveform signal is a first state and the resistance state of the resistance value represents that the resistance value of the insulation resistor is infinity, the insulation monitoring loop is opened; wherein the amplitude of the first state characterization waveform signal is less than a first amplitude threshold.
In an alternative embodiment, detecting the connection state of the insulation monitoring loop according to the state type to which the waveform signal belongs and the resistance state to which the resistance belongs includes:
if the state type of the waveform signal is the second state and the resistance state of the resistance value represents that the resistance value of the insulation resistor is infinity, the insulation monitoring loop is poorly connected; the second state characterizes the amplitude of the waveform signal as being greater than the first amplitude threshold and less than the second amplitude threshold, or characterizes the waveform signal as being discontinuous.
In an alternative embodiment, detecting the connection state of the insulation monitoring loop according to the state type to which the waveform signal belongs and the resistance state to which the resistance belongs includes:
if the state type of the waveform signal is a third state and the resistance state of the resistance represents that the resistance of the insulation resistor is infinite, the insulation monitoring loop is normally connected; the third state characterizes the waveform signal as having an amplitude greater than a second amplitude threshold.
In an alternative embodiment, detecting the connection state of the insulation monitoring loop according to the state type to which the waveform signal belongs and the resistance state to which the resistance belongs includes: if the state type of the waveform signal is a first state and the resistance state of the resistance value represents zero, the insulation monitoring loop is short-circuited; the amplitude of the first state characterization waveform signal is less than a first amplitude threshold.
In an alternative embodiment, detecting the connection state of the insulation monitoring loop based on the waveform signal and the resistance value includes:
extracting characteristic values of waveform signals of the induced electromotive force;
detecting the matching degree of the characteristic value and a preset mode detection table to obtain the matching degree of the waveform signal of the induced electromotive force; the mode detection table is obtained by extracting characteristic values of waveform signals of induced electromotive force under the conditions of open loop, poor contact, normal loop and short loop respectively;
and detecting the connection state of the insulation monitoring loop according to the matching degree and the resistance value of the waveform signals of the induced electromotive force.
In a second aspect, an embodiment of the present invention provides a detection apparatus for an insulation monitoring loop, the apparatus including:
the data acquisition module is used for acquiring waveform signals of induced electromotive force of the core-penetrating screw and acquiring resistance of the insulation resistor;
the state judging module is used for detecting the connection state of the insulation monitoring loop based on the waveform signal and the resistance value.
In a third aspect, embodiments of the present invention provide a computer device comprising a memory and a processor; the memory stores an application program, and the processor is configured to run the application program in the memory to perform the method for detecting an insulation monitoring loop according to any one of the above.
In a fourth aspect, an embodiment of the present invention provides a storage medium storing a plurality of instructions adapted to be loaded by a processor to perform a method for detecting an insulation monitoring loop according to any one of the above.
According to the detection method, the detection device, the electronic equipment and the storage medium of the insulation monitoring loop, provided by the embodiment of the invention, the connection state of the loop where the insulation resistance is located is monitored by acquiring the waveform signal of the induced electromotive force of the core-penetrating screw and acquiring the resistance value of the insulation resistance and based on the waveform signal and the resistance value; therefore, the characteristics of the through-core screw rod with the induced electromotive force are utilized, the induced electromotive force is introduced into the measuring loop, the induced electromotive force is combined with the resistance value of the insulation resistor to detect, and the accurate detection of the connection state of the insulation monitoring loop is realized, so that the insulation monitoring loop can accurately reflect the real condition of the insulation resistor in the process of monitoring the insulation resistor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a device for monitoring a rotating magnetic field circuit according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a detection method of an insulation monitoring circuit according to an embodiment of the present application;
FIG. 3 is a schematic flow chart of another method for detecting an insulation monitoring loop according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a detection device of an insulation monitoring circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an upper computer according to an embodiment of the present application.
Icon: 10-a data acquisition end; 20-a data processing end; 30-an upper computer; 301-memory; 302-a processor; 303-an information interaction unit; 304-a display unit.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
As described in the background art, the monitoring circuit for monitoring insulation resistance may have poor contact, short circuit or open circuit due to installation quality of the equipment, vibration of the equipment, dust and oil pollution and disturbance in maintenance. In the prior art, a lead wire is generally used for forming a monitoring loop to measure the resistance value of the insulation resistor in the insulation resistor monitoring process, but the monitoring loop is easily affected by external factors to influence the connection state, and the real condition of the insulation resistor cannot be accurately reflected. For example, in the case of monitoring the insulation resistance to infinity or open circuit, the resistance characterization of the insulation resistance is the same, so that the actual situation of the insulation resistance cannot be accurately reflected in the process of monitoring the insulation resistance.
Based on the above-mentioned research, the invention provides a detection method, a detection device, an electronic device and a storage medium for an insulation monitoring loop, which can accurately detect the connection state of the insulation monitoring loop by monitoring the waveform signal of the induced electromotive force of the core-through screw and the resistance value of the insulation resistor at the same time.
As shown in fig. 1, fig. 1 is a schematic diagram of a device structure for monitoring a rotating magnetic field circuit, and fig. 1 includes a data acquisition end 10, a data processing end 20, and an upper computer 30.
The data acquisition end 10 comprises an induced electromotive force monitoring module and an insulation resistance monitoring module, wherein the induced electromotive force monitoring module comprises a sampling resistor, an A/D converter and an I/O interface, the sampling resistor, the A/D converter and the I/O interface are electrically connected, the sampling resistor is used for acquiring an analog quantity of the induced electromotive force, the A/D converter is used for converting the analog quantity into a digital quantity, and the I/O interface is used for transmitting the digital quantity to the PLC; the insulation resistance monitoring module 20 is used for collecting the resistance value of the insulation resistance of the core-penetrating screw.
The data processing end 20 comprises a programmable logic controller (Programmable Logic Controller, PLC), wherein the PLC comprises a Central Processing Unit (CPU), an I/O module and a communication module, the I/O module is used for acquiring a waveform signal of an induced electromotive force and a resistance value of an insulation resistor, the CPU performs logic judgment on the waveform signal of the induced electromotive force and the resistance value of the insulation resistor, and outputs a logic judgment result, and the communication module comprises a warning unit; and judging whether to send a pre-alarm signal to the upper computer according to the waveform signal of the induced electromotive force, and judging whether to send an alarm signal to the upper computer by combining the resistance value of the insulation resistor. The data processing end 20 performs composite judgment on the waveform signal of the induced electromotive force and the resistance value of the insulation resistor, so that the result of the judgment can be refined, and the detection of the insulation monitoring loop is more accurate and clear.
The upper computer 30 comprises a memory 301, a processor 302, an information interaction unit 303 and a display unit 304, wherein the information interaction unit 303 is used for carrying out communication interaction with the PLC of the intelligent control terminal 20, acquiring waveform signals of induced electromotive force of the core-penetrating screw and resistance values of insulation resistors in real time, the processor 302 processes and converts the information and displays the processed and converted information through the display unit 304, and meanwhile, the memory 301 stores the waveform signals of the induced electromotive force of the core-penetrating screw and the resistance values of the insulation resistors in real time, so that historical data can be queried.
The communication interaction among the data acquisition end 10, the data processing end 20 and the upper computer 30 is based on communication connection and transmits and receives data through a network.
In some embodiments, the network may be any type of wired or wireless network, or a combination thereof. By way of example only, the network may include a wired network, a wireless network, a fiber optic network, a telecommunications network, an intranet, the Internet, a local area network (Local Area Network, LAN), a wide area network (Wide Area Network, WAN), a wireless local area network (Wireless Local Area Networks, WLAN), a metropolitan area network (Metropolitan Area Network, MAN), a wide area network (Wide Area Network, WAN), a public switched telephone network (Public Switched Telephone Network, PSTN), a Bluetooth network, a ZigBee network, a near field communication (Near Field Communication, NFC) network, or the like, or any combination thereof.
In a specific implementation scenario, the data acquisition end 10 respectively acquires a waveform signal of induced electromotive force of the piercing screw and a resistance value of the insulation resistor, and transmits the waveform signal and the resistance value to the data processing end 20, and the data processing end 20 analyzes the waveform signal and the resistance value to obtain an analysis result.
The data processing end 20 transmits the analysis result to the upper computer, and sends a pre-alarm or alarm signal to the upper computer based on the analysis result.
In an alternative embodiment, the upper computer 30 performs the visualization process based on the checked analysis result.
Based on the implementation architecture of fig. 1, the present embodiment provides a method for detecting an insulation monitoring loop, which is executed by the apparatus shown in fig. 1, and the following details the steps of the method for detecting an insulation monitoring loop provided in the present embodiment, please refer to fig. 2, and the method for detecting an insulation monitoring loop provided in the present embodiment includes steps S10-S12.
Step S10: and acquiring a waveform signal of the induced electromotive force of the core-penetrating screw.
According to the sampling resistor, the analog quantity of the induced electromotive force of the core-penetrating screw rod can be obtained, the analog quantity of the induced electromotive force can be converted into the digital quantity of the induced electromotive force through the A/D converter, wherein the digital quantity of the induced electromotive force is consistent with a signal used by a computer and is a binary code, and the digital quantity is convenient for the computer to store, process and exchange the digital quantity, so that the automation and the intellectualization of data processing are realized.
The mode of acquiring the waveform signals of the induced electromotive force of the core-penetrating screw rod can be timing acquisition, the acquisition frequency of information is adjusted according to different application scenes or working requirements, communication resources are saved by adopting the mode of timing information acquisition, and meanwhile computing resources are also saved.
Optionally, the mode of obtaining the waveform signal of the induced electromotive force of the core-through screw rod can also be real-time collection, and the waveform signal of the induced electromotive force of the core-through screw rod is obtained in real time, and based on the real-time obtaining of the waveform signal of the induced electromotive force of the core-through screw rod, the more accurate monitoring of the rotating magnetic field loop is realized.
Step S11: and obtaining the resistance value of the insulation resistor.
The insulation monitoring circuit is interfered by oil dirt, dust and other factors to cause short circuit of the insulation monitoring circuit, when the insulation monitoring circuit is short-circuited, the induced electromotive force of the core penetrating screw is monitored to be zero, if the connection state of the insulation monitoring circuit is judged only by the induced electromotive force, the insulation monitoring circuit is judged to be open circuit at the moment, and obviously, the result is incorrect, so that the resistance value monitoring of the insulation resistor is added, and the connection state of the insulation monitoring circuit judged by the induced electromotive force is checked to detect the correct connection state of the insulation monitoring circuit. Wherein, based on insulation resistance monitoring module gathers insulation resistance's resistance.
Step S11: and detecting the connection state of the insulation monitoring loop based on the waveform signal and the resistance value.
The connection state of the insulation monitoring loop comprises normal loop, poor loop contact, open loop and short loop. The four connection states are determined based on the waveform signal of the induced electromotive force and the resistance value of the insulation resistance.
The method comprises the steps of determining whether an insulation monitoring loop is open or short-circuited based on the magnitude of the induced electromotive force, whether the waveform of the induced electromotive force is continuous or not and determining whether the insulation monitoring loop is poor in contact or not based on the magnitude of the induced electromotive force, whether the waveform of the induced electromotive force is continuous or not and whether the waveform of the induced electromotive force is fluctuation of the induced electromotive force or not, and checking four connection states of the insulation monitoring loop by combining the states of resistance values on the basis.
According to the detection method of the insulation monitoring loop, provided by the embodiment of the invention, the waveform signal of the induced electromotive force of the core-penetrating screw is obtained, the resistance value of the insulation resistor is obtained, and the connection state of the loop where the insulation resistor is located is monitored based on the waveform signal and the resistance value; therefore, the characteristics of the through-core screw rod with the induced electromotive force are utilized, the induced electromotive force is introduced into the measuring loop, the induced electromotive force is combined with the resistance value of the insulation resistor to detect, and the accurate detection of the connection state of the insulation monitoring loop is realized, so that the insulation monitoring loop can accurately reflect the real condition of the insulation resistor in the process of monitoring the insulation resistor.
In order to realize detection of an insulation monitoring loop under different working conditions and different devices, the embodiment of the application provides an analysis method based on induced electromotive force and insulation resistance, please refer to fig. 3 in combination, and judge the connection state of the loop based on waveform signals and resistance, including steps S20-S22.
Step S20: performing state analysis on the waveform signals to obtain the state types of the waveform signals;
step S21: carrying out resistance analysis on the resistance to obtain a resistance state of the resistance;
step S22: and detecting the connection state of the insulation monitoring loop according to the state type of the waveform signal and the resistance state of the resistance.
The waveform signal is subjected to state analysis to obtain amplitude, frequency, phase and the like of the waveform signal, and in one embodiment, the connection state of the loop is monitored by using the amplitude and the phase of the waveform signal, and the connection state of the insulation monitoring loop is primarily judged.
The change of the connection state of the insulation monitoring loop can affect the change of the amplitude and the phase of the induced electromotive force, for example, the amplitude of the induced electromotive force tends to zero when the insulation monitoring loop is open or the loop is short-circuited, the amplitude of the induced electromotive force is in wide range of fluctuation when the insulation monitoring loop is in poor contact, for example, the amplitude of the induced electromotive force suddenly drops to 10V when 220V, the waveform signal of the induced electromotive force is discontinuous, and when the insulation monitoring loop is normally connected, the induced electromotive force keeps a normal value, and the normal value means that the fluctuation of the amplitude of the induced electromotive force is not more than 10% when the induced electromotive force is 220V. Based on this, the present embodiment can determine the state type of the induced electromotive force in advance according to several connection states of the insulation monitoring circuit.
In this embodiment, the waveform signals of the induced electromotive force include three types, which are a first state, a second state and a third state, wherein the state type of the waveform signals is that the first state corresponds to the connection state of the insulation monitoring circuit and is that the circuit is open or short, the state type of the waveform signals is that the second state corresponds to the connection state of the insulation monitoring circuit and is that the circuit is poor in contact, and the state type of the waveform signals is that the third state corresponds to the connection state of the insulation monitoring circuit and is that the circuit is normal.
The insulation resistance is usually large, and usually shows infinity when the measurement is performed, and shows zero when the connection state of the insulation monitoring loop is short-circuited. Therefore, in this embodiment, the resistance states include two states, namely, a resistance value of infinity and a resistance value of zero, wherein the connection state of the insulation monitoring circuit corresponding to the resistance value of zero is a circuit short circuit, and the connection state of the insulation monitoring circuit corresponding to the resistance value of infinity is a circuit normal, a circuit contact failure and a circuit disconnection.
In this embodiment, when detecting the connection state of the insulation monitoring loop, after the waveform signal of the induced electromotive force of the core-penetrating screw and the resistance value of the insulation resistor are obtained, the waveform signal may be subjected to state analysis to obtain the state type to which the waveform signal belongs, and then the resistance value is subjected to resistance value analysis to obtain the resistance value state to which the resistance value belongs, and after the state type and the resistance value state of the waveform signal are obtained, the connection state of the insulation monitoring loop may be detected according to the state type to which the waveform signal belongs and the resistance value state to which the resistance value belongs.
In one embodiment, detecting a connection state of the insulation monitoring loop according to a state type to which the waveform signal belongs and a resistance state to which the resistance belongs includes:
if the state type of the waveform signal is a first state and the resistance state of the resistance value represents that the resistance value of the insulation resistor is infinity, the loop is opened; wherein the amplitude of the first state characterization waveform signal is less than a first amplitude threshold.
The amplitude of the first state characterization waveform signal is less than a first amplitude threshold, wherein the first amplitude threshold may be a value close to zero, for example, 0.01v,0.02v, etc., and may be specifically set according to practical situations. When the state type of the waveform signal is the first state, the amplitude of the waveform signal is represented to be infinitely close to zero, the open circuit or the short circuit of the loop is preliminarily judged, verification is carried out based on resistance monitoring, and if the resistance value of the insulation resistor is represented to be infinitely large by the resistance value state of the resistance value, namely, the resistance value of the insulation resistor is represented to be infinitely close to zero when the amplitude of the waveform signal is represented to be infinitely close to zero, so that the open circuit of the insulation monitoring loop can be determined.
In one embodiment, detecting a connection state of the insulation monitoring loop according to a state type to which the waveform signal belongs and a resistance state to which the resistance belongs includes:
if the state type of the waveform signal is the second state and the resistance state of the resistance value represents that the resistance value of the insulation resistor is infinity, the insulation monitoring loop is poorly connected; the second state characterizes the amplitude of the waveform signal as being greater than the first amplitude threshold and less than the second amplitude threshold, or characterizes the waveform signal as being discontinuous.
The second state characterizes that the amplitude of the waveform signal is greater than the first amplitude threshold and smaller than the second amplitude threshold, or the waveform signal is discontinuous, wherein the second amplitude threshold is smaller than the maximum amplitude of the waveform signal, a specific set value of the second amplitude threshold is selected based on different actual requirements and equipment, for example, in the embodiment, the maximum value of the amplitude of the waveform signal is 200V, the second amplitude threshold is set to be 100V, and if the amplitude of the waveform signal is monitored to be 10V, the amplitude of the waveform signal is determined to be greater than the first preset threshold and smaller than the second amplitude threshold; the waveform signal discontinuity is represented as a phase loss at the data processing end, and the waveform signal discontinuity is represented as a waveform image discontinuity at the upper computer. Based on the analysis of the waveform signal, the loop contact failure is preliminarily judged.
And checking based on the resistance value monitoring, and judging the poor contact of the loop through the resistance value monitoring check when the resistance value of the resistance value state representing the insulation resistance is infinity.
In one embodiment, detecting a connection state of the insulation monitoring loop according to a state type to which the waveform signal belongs and a resistance state to which the resistance belongs includes:
if the state type of the waveform signal is a third state and the resistance state of the resistance represents that the resistance of the insulation resistor is infinite, the insulation monitoring loop is normally connected; the third state characterizes the waveform signal as having an amplitude greater than a second amplitude threshold.
The amplitude of the third state representation waveform signal is larger than a second amplitude threshold, wherein the second amplitude threshold is larger than the first amplitude threshold and smaller than the maximum amplitude, for example, the maximum value of the amplitude of the waveform signal is 200V, the second amplitude threshold is set to be 100V, the amplitude of the third state representation waveform signal is 180V, the loop is primarily judged to be normal, checking is carried out based on resistance monitoring, and when the resistance of the resistance state representation insulation resistor is infinite, the loop is judged to be normal through resistance monitoring checking.
In one embodiment, oil dirt and dust existing in an actual working condition can cause a short circuit of an insulation monitoring loop, so that the amplitude of an induced electromotive force in the loop tends to zero, and the amplitude of the induced electromotive force tends to zero possibly being caused by an open circuit or a short circuit of the insulation monitoring loop, when the connection state of the insulation monitoring loop cannot be accurately judged to be the open circuit or the open circuit, resistance monitoring is added for judging, wherein the connection state of the insulation monitoring loop can be detected according to the state type of a waveform signal and the resistance state of the resistance, and the method comprises the following steps:
if the state type of the waveform signal is a first state and the resistance state of the resistance value represents zero, the insulation monitoring loop is short-circuited; the amplitude of the first state characterization waveform signal is less than a first amplitude threshold.
The amplitude of the first state representation waveform signal is smaller than a first amplitude threshold value, wherein the first amplitude threshold value tends to zero, namely, in the first state, the amplitude of the waveform signal is infinitely close to zero, the open circuit or the short circuit of the loop is preliminarily judged, checking is carried out based on resistance monitoring, the resistance of the resistance state representation insulation resistor is zero, namely, in the first state, the resistance of the insulation resistor tends to zero, and the short circuit of the insulation monitoring loop is judged through resistance monitoring checking.
The detection method of the insulation monitoring loop provided by the embodiment of the invention can effectively detect various connection states in the insulation monitoring loop, including open circuit, short circuit, poor contact and normal state of the loop, and can detect some pollution conditions possibly existing in the loop, so that the detection method has good practicability.
In one embodiment, detecting a connection state of an insulation monitoring circuit based on a waveform signal and a resistance value includes:
extracting characteristic values of waveform signals of the induced electromotive force;
detecting the matching degree of the characteristic value and a preset mode detection table to obtain the matching degree of the waveform signal of the induced electromotive force; the mode detection table is obtained by extracting characteristic values of waveform signals of induced electromotive force under the conditions of open loop, poor contact, normal loop and short circuit respectively;
and detecting the connection state of the insulation monitoring loop according to the matching degree and the resistance value of the waveform signals of the induced electromotive force.
Extracting characteristic values of waveform signals of induced electromotive force, wherein the characteristic values comprise amplitude values, frequency and phases, respectively detecting matching degrees of the characteristic values and a preset mode detection table, and the preset mode detection table comprises a loop normal mode detection table, a loop poor contact mode detection table, a loop short circuit mode detection table and a loop open circuit mode detection table.
The loop normal mode detection table is based on acquiring characteristic values of waveform signals under a plurality of periods in a normal state of connection of the insulation monitoring loop, and respectively carrying out weighted average on the characteristic values acquired for a plurality of times to obtain the loop normal mode detection table.
Similarly, the loop poor contact mode detection table is based on the fact that characteristic values of waveform signals under a plurality of periods are obtained under the condition that the loop poor contact is monitored in an insulation mode, and the characteristic values obtained in a plurality of times are respectively weighted and averaged to obtain the loop poor contact mode detection table.
The characteristic values of the waveform signals in the loop short-circuit mode detection table and the loop short-circuit mode detection table are zero, namely the amplitude, the frequency and the phase are zero.
And respectively carrying out matching degree detection on the characteristic values of the waveform signals of the induced electromotive force to be detected and the four mode detection tables, wherein the matching degree detection can carry out matching of single characteristic values or matching of a plurality of characteristic values, determining a mode detection result according to a matching degree threshold value, obtaining preliminary judgment of the connection state of the insulation monitoring loop, and checking the preliminary judgment based on the monitoring of the resistance value.
Taking the detection of the matching degree with the loop normal mode detection table as an example, the matching result is that the amplitude matching degree is 93%, the frequency matching degree is 98%, the phase matching degree is 64%, and the like, and the matching degree threshold value is preset to 90%, namely when the matching degree of one characteristic value is more than 90%, the loop normal can be primarily judged, or three characteristics are simultaneously more than 60%, the loop normal can be primarily judged. And then monitoring the resistance value of the insulation resistor, and judging that the insulation monitoring loop is normal if the resistance value of the insulation resistor is infinite.
In an alternative embodiment, as shown in fig. 4, a specific application scenario of the detection method of the insulation monitoring loop is described.
As described in the background art, the monitoring circuit for monitoring insulation resistance may have poor contact, short circuit or open circuit due to installation quality of the equipment, vibration of the equipment, dust and oil pollution and disturbance in maintenance. In the prior art, a monitoring loop is generally formed by using an outgoing line to measure the resistance of the insulation resistor, but the resistance of the insulation resistor is characterized in the same way under the condition of infinite or open circuit monitoring of the insulation resistor, so that the real condition of the insulation resistor cannot be accurately reflected in the process of monitoring the insulation resistor.
The embodiment of the application provides a detection method of an insulation monitoring loop, which monitors the connection state of the insulation monitoring loop in real time by monitoring waveform signals of induced electromotive force of a core penetrating screw and the resistance value of an insulation resistor.
The detection device for realizing the insulation monitoring loop comprises a data acquisition end, a data processing end and an upper computer, wherein the data acquisition end is used for acquiring waveform signals of induced electromotive force of the core penetrating screw and resistance values of insulation resistors, and the data processing end is used for analyzing the waveform signals and the resistance values so as to determine connection states of the loop.
The connection states of the loops comprise four types, namely normal loops, poor loop contact, open loops and short loops, and the judgment modes of the connection states of the loops are as follows:
if the amplitude of the waveform signal of the induced electromotive force is monitored to be larger than zero, the value is kept stable and has no fluctuation, and meanwhile, the resistance value of the insulation resistor is monitored to be towards infinity, the loop is judged to be normal.
If the amplitude of the waveform signal of the induced electromotive force is monitored to generate fluctuation or the waveform signal is discontinuous, the data processing end sends a pre-alarm signal to the upper computer, and meanwhile, when the resistance value of the insulation resistor is monitored to be approaching infinity, poor contact of the loop is judged, and meanwhile, an alarm signal is sent to the upper computer.
If the amplitude of the waveform signal of the induced electromotive force is monitored to be close to zero, the data processing end sends a pre-alarm signal to the upper computer, and when the resistance of the insulation resistor is monitored to be close to infinity, the loop is judged to be open, and when the resistance of the insulation resistor is monitored to be close to zero, the loop is judged to be short-circuited, and an alarm signal is sent to the upper computer.
The connection state of the insulation monitoring loop can be detected based on a preset mode detection table, wherein the preset mode detection table comprises a loop normal mode detection table, a loop poor contact mode detection table, a loop short circuit mode detection table and a loop open circuit mode detection table.
And respectively carrying out matching degree detection on the characteristic values of the waveform signals of the induced electromotive force to be detected and the four mode detection tables, wherein the matching degree detection can carry out matching of single characteristic values or matching of a plurality of characteristic values, determining a mode detection result according to a matching degree threshold value, obtaining preliminary judgment of the connection state of the insulation monitoring loop, and judging the connection state of the insulation monitoring loop according to the resistance value of the insulation resistor.
The embodiment of the present invention further provides a host computer 30, as shown in fig. 5, which shows a schematic structural diagram of the host computer 30 according to the embodiment of the present invention, specifically:
the upper computer 30 may include one or more computer-readable storage media of memory 301, one or more processing cores of processor 302, information interaction unit 303, and the like. Those skilled in the art will appreciate that the configuration of the upper computer 30 shown in fig. 5 is not limiting of the upper computer 30 and may include more or fewer components than shown, or may combine certain components, or may have a different arrangement of components. Wherein:
the processor 302 is a control center of the upper computer 30, and connects various parts of the entire upper computer 30 using various interfaces and lines, and executes various functions of the upper computer 30 and processes data by running or executing software programs and/or modules stored in the memory 301 and calling data stored in the memory 301, thereby performing overall monitoring of the upper computer 30. Optionally, the processor 302 may include one or more processing cores; alternatively, the processor 302 may integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., with a modem processor that primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 302.
The memory 301 may be used to store software programs and modules, and the processor 302 executes various functional applications and data processing by running the software programs and modules stored in the memory 301. The memory 301 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the upper computer 30, and the like. In addition, memory 301 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 301 may also include a memory controller to provide access to the memory 301 by the processor 302.
The upper computer 30 may further include an information interaction unit 303, which information interaction unit 303 may be used to receive input numeric or character information and to generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.
The upper computer 30 may further include a display unit 304, etc., which will not be described herein. In this embodiment, the processor 302 in the upper computer 30 loads executable files corresponding to the processes of one or more application programs into the memory 301 according to the following instructions, and the processor 302 executes the application programs stored in the memory 301, thereby implementing various functions.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be performed by instructions, or by hardware associated with the control of instructions, which may be stored in a computer-readable memory 301 and loaded and executed by a processor 302.
To this end, an embodiment of the present invention provides a storage medium having stored therein a plurality of instructions capable of being loaded by the processor 302 to perform the steps of any of the insulation monitoring loop detection methods provided by the embodiment of the present invention. For example, the instructions may perform the steps of:
acquiring a waveform signal of induced electromotive force of the core-penetrating screw;
acquiring the resistance value of the insulation resistor;
and detecting the connection state of the insulation monitoring loop based on the waveform signal and the resistance value.
The specific implementation of each operation above may be referred to the previous embodiments, and will not be described herein.
Wherein the storage medium may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.
On the basis of the above, an embodiment of the present invention provides an electronic device, including a processor, a storage medium and a bus, where the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium through the bus, and the processor executes the machine-readable instructions to execute the steps of the detection method of an insulation monitoring loop according to any one of the foregoing embodiments.
In some embodiments, the electronic device may also be a service request terminal, and in some embodiments, the electronic device may also be a service response terminal, which may be specifically determined according to an actual application scenario.
In summary, according to the detection method, the device, the electronic equipment and the storage medium for the insulation monitoring loop provided by the embodiment of the invention, the connection state of the loop where the core penetrating screw is located is monitored based on the waveform signal and the resistance value by acquiring the waveform signal of the induced electromotive force of the core penetrating screw and acquiring the resistance value of the insulation resistance of the core penetrating screw; in this way, by utilizing the characteristic that the monitored object has induced electromotive force, induced electromotive force measurement is introduced into the measurement loop, and the connection state of the core-penetrating screw loop is primarily judged; and checking preliminary judgment according to the characteristic that the resistance value is infinite after the loop is opened by combining with an insulation resistance measurement result, so as to realize accurate monitoring of the connection state of the loop where the through screw is positioned.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description of the embodiments is only for helping to understand the technical solution of the present application and its core ideas; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (5)
1. The method for detecting the insulation monitoring loop is used for detecting the insulativity between the core penetrating screw rod of the generator stator and the silicon steel sheet, and the insulation monitoring loop comprises an insulation resistor arranged between the core penetrating screw rod and the silicon steel sheet, and is characterized by comprising the following steps:
acquiring a waveform signal of induced electromotive force of the core-penetrating screw;
acquiring the resistance value of the insulation resistor;
performing state analysis on the waveform signal to obtain a state type of the waveform signal;
performing resistance analysis on the resistance to obtain a resistance state of the resistance;
detecting the connection state of the insulation monitoring loop according to the state type of the waveform signal and the resistance state of the resistance, wherein the connection state comprises the following steps:
if the state type of the waveform signal is a first state and the resistance state of the resistance represents that the resistance of the insulation resistor is infinity, the insulation monitoring loop is opened; wherein the first state characterizes that the amplitude of the waveform signal is less than a first amplitude threshold;
if the state type of the waveform signal is a second state and the resistance state of the resistance represents that the resistance of the insulation resistor is infinite, the insulation monitoring loop is poorly connected; the second state characterizes the amplitude of the waveform signal as being greater than a first amplitude threshold and less than a second amplitude threshold, or characterizes the waveform signal as being discontinuous;
if the state type of the waveform signal is a third state and the resistance state of the resistance represents that the resistance of the insulation resistor is infinite, the insulation monitoring loop is normally connected; the third state characterizes the amplitude of the waveform signal as being greater than a second amplitude threshold;
if the state type of the waveform signal is a first state and the resistance state of the resistance represents zero, the insulation monitoring loop is short-circuited; the first state characterizes that the amplitude of the waveform signal is less than a first amplitude threshold.
2. The method for detecting the insulation monitoring loop is used for detecting the insulativity between the core penetrating screw rod of the generator stator and the silicon steel sheet, and the insulation monitoring loop comprises an insulation resistor arranged between the core penetrating screw rod and the silicon steel sheet, and is characterized by comprising the following steps:
acquiring a waveform signal of induced electromotive force of the core-penetrating screw;
acquiring the resistance value of the insulation resistor;
extracting characteristic values of the waveform signals of the induced electromotive force;
performing matching degree detection on the characteristic value and a preset mode detection table to obtain the matching degree of the waveform signal of the induced electromotive force; the mode detection table is obtained by extracting characteristic values of waveform signals of induced electromotive force under the conditions of open loop, poor contact, normal loop and short loop respectively;
and detecting the connection state of the insulation monitoring loop according to the matching degree of the waveform signal of the induced electromotive force and the resistance value.
3. The utility model provides a detection device of insulation monitoring return circuit, insulation monitoring return circuit is used for detecting the insulating nature between generator stator core screw rod and the silicon steel sheet, and insulation monitoring return circuit includes the insulation resistance of installation between core screw rod and the silicon steel sheet, its characterized in that, the device includes:
the data acquisition module is used for acquiring waveform signals of induced electromotive force of the core-penetrating screw and acquiring resistance of the insulation resistor;
the state judging module is used for carrying out state analysis on the waveform signals to obtain the state types of the waveform signals;
performing resistance analysis on the resistance to obtain a resistance state of the resistance;
detecting the connection state of the insulation monitoring loop according to the state type of the waveform signal and the resistance state of the resistance, wherein the connection state comprises the following steps:
if the state type of the waveform signal is a first state and the resistance state of the resistance represents that the resistance of the insulation resistor is infinity, the insulation monitoring loop is opened; wherein the first state characterizes that the amplitude of the waveform signal is less than a first amplitude threshold;
if the state type of the waveform signal is a second state and the resistance state of the resistance represents that the resistance of the insulation resistor is infinite, the insulation monitoring loop is poorly connected; the second state characterizes the amplitude of the waveform signal as being greater than a first amplitude threshold and less than a second amplitude threshold, or characterizes the waveform signal as being discontinuous;
if the state type of the waveform signal is a third state and the resistance state of the resistance represents that the resistance of the insulation resistor is infinite, the insulation monitoring loop is normally connected; the third state characterizes the amplitude of the waveform signal as being greater than a second amplitude threshold;
if the state type of the waveform signal is a first state and the resistance state of the resistance represents zero, the insulation monitoring loop is short-circuited; the first state characterizes that the amplitude of the waveform signal is less than a first amplitude threshold.
4. An electronic device, the electronic device comprising:
a memory storing executable instructions;
a processor for implementing the method for detecting an insulation monitoring loop according to any one of claims 1 to 2 when executing executable instructions stored in said memory.
5. A computer readable storage medium storing executable instructions which, when executed, are adapted to implement the insulation monitoring circuit detection method of any one of claims 1 to 2.
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| CN101228447A (en) * | 2005-08-29 | 2008-07-23 | 丰田自动车株式会社 | Insulation resistance degradation detector and failure self-diagnostic method for insulation resistance degradation detector |
| CN101799518B (en) * | 2010-02-05 | 2012-07-04 | 贵阳新光电气有限公司 | Online monitoring and grounding protection methods of insulation of generator stator core tightening screw rods |
| KR101354583B1 (en) * | 2010-09-17 | 2014-01-22 | 에스케이이노베이션 주식회사 | Insulation resistance measurement circuit |
| DE102016207197B3 (en) * | 2016-04-27 | 2017-07-13 | Bender Gmbh & Co. Kg | Method and devices for functional testing of an insulation monitoring device |
| JP6718394B2 (en) * | 2017-02-06 | 2020-07-08 | 株式会社日立産機システム | Insulation monitoring device and insulation monitoring system |
| CN107064637B (en) * | 2017-03-10 | 2019-11-01 | 长沙天恒测控技术有限公司 | Electrical sheet surface insulation resistance measuring device |
| JP2019201498A (en) * | 2018-05-17 | 2019-11-21 | 大銀微系統股▲分▼有限公司Ｈｉｗｉｎ Ｍｉｋｒｏｓｙｓｔｅｍ Ｃｏｒｐ． | Motor insulation detection method |
| JP7294022B2 (en) * | 2019-09-19 | 2023-06-20 | 株式会社デンソー | Earth leakage detection circuit |
| DE102019125982B4 (en) * | 2019-09-26 | 2021-06-10 | Bender Gmbh & Co. Kg | Combined monitoring device for insulation resistance and protective conductor resistance monitoring of a power supply system |
| CN111929554A (en) * | 2020-08-05 | 2020-11-13 | 江苏经纬轨道交通设备有限公司 | Insulation monitoring device, system, method, equipment, medium and auxiliary inverse system |
| CN114252712A (en) * | 2020-09-25 | 2022-03-29 | 北京宝沃汽车股份有限公司 | Battery pack insulation detection circuit and method and vehicle |
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