CN115184729A - Simulation system and method for automatically detecting and processing intermittent arc grounding fault - Google Patents
Simulation system and method for automatically detecting and processing intermittent arc grounding fault Download PDFInfo
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- CN115184729A CN115184729A CN202210853370.4A CN202210853370A CN115184729A CN 115184729 A CN115184729 A CN 115184729A CN 202210853370 A CN202210853370 A CN 202210853370A CN 115184729 A CN115184729 A CN 115184729A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- 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
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- 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
Abstract
The invention discloses a simulation system and a method for automatically detecting and processing an intermittent arc ground fault, wherein the system comprises: the fault simulation device is used for controlling the plurality of switches to simulate the occurrence and disappearance of the intermittent arc grounding fault through the remote control device; the data detection device is used for detecting zero sequence voltage and phase current signals generated when the fault simulation device simulates an intermittent arc ground fault, filtering the zero sequence voltage and phase current signals according to the transient frequency in the intermittent arc, and judging the ground fault after obtaining corresponding transient quantity; and the fault processing device is used for processing the intermittent arc grounding fault by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel. The invention simulates intermittent arc earth faults, determines the faults through an automatic detection method of the single-phase earth faults of the power system and solves the faults by adopting a logic method for processing the intermittent arc earth faults.
Description
Technical Field
The invention belongs to the technical field of power system ground faults, and relates to a simulation system and method for automatically detecting and processing intermittent arc ground faults.
Background
With the rapid development of the economic society and the continuous improvement of the quality of national power grids, the requirements on the reliability and economy in the working process of a power system are further strengthened, and one important solution is to reduce the occurrence of power distribution network faults. With the support of economic growth, in recent years, the development of power systems in China is more and more rapid, the utilization rate of cable lines in all parts of the country is gradually increased, and the failure frequency is increased.
When the ground fault occurs in an underground cable circuit, electric arcs generally occur along with the ground fault, and the ground fault is characterized in that repeated extinguishing and re-ignition occur, the electric arcs are temporarily extinguished at the moment when the current reaches a power frequency zero point, and the re-ignition phenomenon also occurs when the phase voltage rises again. The difficulty of completely extinguishing the arc is high, and for intermittent arc ground faults, the voltage generated when the fault occurs exceeds about 2 times of the voltage generated when the fault normally operates, and the insulating medium on the overvoltage circuit with the strength is easy to be punctured, so that the gate on the circuit is damaged, other devices are damaged and deformed, and a fire disaster can be caused.
At present, the intermittent arc grounding fault is detected and processed manually, manpower and material resources are consumed in the mode, careless omission is easily caused in the mode of manual detection and processing, and the safety of workers is difficult to guarantee. Therefore, a simulation system capable of automatically detecting and processing the intermittent arc ground fault needs to be researched, the whole process is simulated, the processing mechanism of the sudden fault in the actual work is further perfected, and the capability of the power distribution network line for processing the ground fault is enhanced.
Disclosure of Invention
In order to solve the defects in the prior art, the present invention provides a simulation system and method for automatically detecting and processing an intermittent arc ground fault, wherein the intermittent arc ground fault is simulated, the zero-sequence voltage and the phase current signals generated when the intermittent ground fault occurs are detected, the zero-sequence voltage and the phase current signals are filtered according to the transient frequency in the intermittent arc, the corresponding transient quantity is obtained, then the ground fault is determined, and the intermittent ground fault is processed by using a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a simulation system for automatically detecting and processing intermittent arc grounding faults comprises a fault simulation device, a fault processing device and a data detection device;
the fault simulation device is used for controlling the plurality of switches to simulate the occurrence and disappearance of intermittent earth faults;
the data detection device is used for detecting zero sequence voltage, phase current signals and intermittent arcs generated when the fault simulation device simulates the occurrence of the intermittent arc ground fault, and filtering the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs to obtain corresponding transient components and then judge the ground fault;
and the fault processing device is used for processing the intermittent arc grounding fault by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel when the data detection device judges the intermittent arc grounding fault.
The invention further comprises the following preferred embodiments:
preferably, the fault simulation device comprises a disconnecting switch, a control switch, a grounding switch, a protection resistor, a grounding fault device and a remote control device;
the head end of the protection resistor is connected with the tail end of the control switch;
one end of the ground fault device is grounded, and the other end of the ground fault device is connected with the tail end of the protection resistor;
the head end of the control switch is connected with the tail end of the isolating switch and the head end of the grounding switch;
the tail end of the grounding switch is grounded, and the head end of the isolating switch is connected with the data monitoring device;
the remote control device controls the on and off of the isolating switch, the control switch and the grounding switch so as to simulate the occurrence and disappearance of intermittent arc grounding faults.
Preferably, before the simulation system is operated, the switch states in the fault simulation device are:
the isolating switch is in an off state, the control switch is in an off state, and the grounding switch is in an on state, so that the tail end of the isolating switch is grounded.
Preferably, in the fault simulation device, when the intermittent arc ground fault is to be simulated, the remote control device is used as an initial action device to control the disconnecting switch to be closed, control the control switch to be closed and control the grounding switch to be opened so as to simulate the intermittent arc ground fault process;
after the process of simulating the intermittent arc grounding fault is finished, the remote control device controls the disconnecting switch to be disconnected, controls the control switch to be disconnected and controls the grounding switch to be closed.
Preferably, in the fault handling device, the small resistance value of the small resistance grounding device is between 15 and 25 Ω.
The invention also provides a simulation method for automatically detecting and processing the intermittent arc ground fault, which comprises the following steps:
step 1, controlling a plurality of switches to simulate the occurrence and disappearance of intermittent earth faults;
and 2, detecting zero sequence voltage, phase current signals and the intermittent arc generated when the simulated intermittent arc ground fault occurs, filtering the zero sequence voltage and the phase current signals according to transient components in the intermittent arc to obtain corresponding transient components, then judging the ground fault, and when the intermittent arc ground fault is judged, adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel to process the intermittent arc ground fault.
Preferably, the step 2 of detecting the zero-sequence voltage, the phase current signal and the intermittent arc generated when the simulated intermittent arc ground fault occurs, and performing filtering processing on the zero-sequence voltage and the phase current signal according to a transient component in the intermittent arc to obtain a corresponding transient component, and then performing ground fault determination specifically includes:
step 21, detecting in real time zero sequence voltage, phase current signal and intermittent arc generated when the simulated intermittent arc ground fault occurs
Step 22, setting the frequency of the filter to be AHz;
AHz is the frequency in the transient component of the intermittent arc, which is the frequency contained in the transient component after passing through the band pass filter;
step 23, the filter filters the zero-sequence voltage and phase current signals, the phase current passing through the filter only contains the transient quantity appearing in the intermittent arc ground fault, and the zero-sequence voltage passing through the filter only contains the transient quantity appearing in the intermittent arc ground fault;
the zero sequence voltage transient magnitude value at the frequency point i after being processed by the filter is recorded as U mi The phase angle is denoted as ω i I =1,2,. K, k is the number of frequency points;
the phase current transient magnitude at the frequency point I after being processed by the filter is taken as I mj The phase angle is recorded as ω' j ；
Step 24, taking y = c = j = i =1,2,. K, and calculating and comparing the phase current transient quantity corresponding to the frequency point i with the zero sequence voltage transient quantity;
and 25, judging the intermittent arc ground fault according to the calculation and comparison result in the step 24, and sending a signal determined as the intermittent arc ground fault when the intermittent arc ground fault is judged.
Preferably, in step 24, taking y = c = j = i =1,2,. K, the phase current transient amount corresponding to the frequency point i and the zero sequence voltage transient amount are calculated and compared as follows:
calculating the phase angle difference omega between the phase current transient quantity and the zero sequence voltage transient quantity c ，ω c ＝ω’ j- ω I ,；
Zero sequence voltage transient magnitude U mi And preset amplitude U 'thereof' mi Comparing;
amplitude I of current transient mj With it preset amplitude I' mj Comparing;
the difference omega of the phase angles c With its preset value omega y And (6) comparing.
Preferably, in step 25, if U appears in the calculation and comparison result of step 24 mi ＜U’ mi 、I mj ＜I’ mj Or ω c And within a preset range, judging that the intermittent arc grounding fault exists.
Preferably, in step 2, after receiving the signal determined to be the intermittent arc ground fault, the following steps are performed:
1) Connecting the arc suppression coil grounding device to a main circuit where the grounding fault device is located, and compensating grounding capacitance current of the grounding fault device by using the arc suppression coil grounding device to limit system overvoltage;
2) And continuously detecting a signal when the simulated intermittent arc ground fault occurs, if the signal determined as the intermittent arc ground fault disappears, namely the intermittent arc ground fault is considered to be absent, the simulation system recovers to normal operation, otherwise, the intermittent arc ground fault still exists, and the fault cannot be eliminated through the compensation of the arc suppression coil grounding device, so that the fault is eliminated by introducing the small-resistance grounding device.
Preferably, in 2), the intermittent arc ground fault still exists, when the fault cannot be eliminated through the arc suppression coil grounding device compensation, the arc suppression coil grounding device is firstly adopted to compensate the grounding capacitance current, the system overvoltage is suppressed, and then the small resistor grounding device is adopted to directly connect the small resistor with the bus, so that the grounding fault circuit, namely the main circuit where the grounding fault device is located, is tripped in a protection mode, and the fault is eliminated.
Compared with the prior art, the invention has the beneficial effects that:
the invention is carried out by simulating the whole automatic detection, identification and processing process, can further improve the processing mechanism of sudden faults in actual work and strengthen the capability of the power distribution network line for processing the ground fault;
the device can realize the automatic detection, identification and processing of the intermittent arc ground fault, has a simple structure, and can judge the intermittent arc ground fault on the basis of the amplitude and the phase of the quasi-transient change in the current and the zero sequence voltage at a typical transient frequency; when the earth fault is processed, the small resistor is put into operation, so that the fault expansion caused by the fact that the arc suppression coil cannot compensate large current when the capacitance current is large can be avoided.
Drawings
FIG. 1 is a block diagram of a simulation system for automatically detecting and handling intermittent arc ground faults in accordance with the present invention;
wherein the reference numerals are:
1-simulation system, 2-fault simulation device, 3-fault processing device, 4-data detection device, 5-ground fault device, 6-remote control device, S1-isolating switch, S2-control switch, S3-ground switch and R1-protective resistor.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example one
Fig. 1 is a block diagram of a simulation system for automatically detecting and processing an intermittent arc ground fault according to the present invention, and as shown in fig. 1, an example 1 of the present invention provides a simulation system for automatically detecting and processing an intermittent arc ground fault, where in a preferred but non-limiting embodiment of the present invention, the simulation system 1 includes a fault processing device 3, a data detection device 4 and a fault simulation device 2;
the fault simulation device 2 is used for controlling a plurality of switches to simulate the occurrence and disappearance of intermittent arc grounding faults and preparing for applying the simulation to an actual system;
when the fault simulation device 2 simulates that an intermittent arc ground fault occurs, the ground fault occurs intermittently, and the data detection device 4 is required to continuously detect zero-sequence voltage, phase current signals and the intermittent arc generated when the fault simulation device 2 simulates that the intermittent arc ground fault occurs, and judge in real time;
further preferably, the fault simulation device 2 is structurally shown in fig. 1;
the fault simulation device 2 comprises an isolating switch S1, a control switch S2, a grounding switch S3, a protection resistor R1, a grounding fault device 5 and a remote control device 6;
one end of the ground fault device 5 is grounded, and the other end of the ground fault device is connected with the tail end of the protective resistor R1;
the head end of the protective resistor R1 is connected with the tail end of the control switch S2;
the head end of the control switch S2 is connected with the tail end of the isolating switch S1 and the head end of the grounding switch S3;
the tail end of the grounding switch S3 is grounded, and the head end of the isolating switch S1 is connected with a data monitoring device;
the remote control device 6 controls the on and off of the isolating switch S1, the control switch S2 and the grounding switch S3 so as to simulate the occurrence and disappearance of the intermittent arc grounding fault.
The head end of the simulated ground fault 5 is grounded in a ground fault mode through the tail end of the ground fault device 5, and the specific type of the ground fault is an intermittent arc ground fault.
Before the entire simulation system 1 is operated, in order to avoid a corresponding fault due to a faulty actuation of the disconnector S1 when this simulation system 1 is not in use:
in the non-simulation process, the grounding switch S3 is in a closed state, so that the tail end of the isolating switch S1 is grounded;
during the simulation process, the grounding switch S3 is disconnected, and the isolating switch S1 is closed, so that the normal simulation of the intermittent arc grounding fault is ensured.
That is, before the simulation system 1 is operated, the switch states in the fault simulation apparatus 2 are:
the disconnecting switch S1 is in an off state, namely, the head end and the tail end are separated, the control switch S2 is in an off state, namely, the head end and the tail end are separated, a guarantee is added for avoiding misoperation caused by intermittent electric arcs, and the grounding switch S3 is in an on state, so that the tail end of the disconnecting switch S1 is grounded.
And the remote control device 6 is used for controlling the opening and closing actions of the control switch S2, the isolating switch S1 and the grounding switch S3 so as to simulate the occurrence and disappearance of the intermittent arc grounding fault.
When preparing to simulate an intermittent arc ground fault:
the remote control device 6 controls the disconnecting switch S1 to be closed, namely in a connected state, controls the control switch S2 to be closed, namely in a connected state, and controls the grounding switch S3 to be disconnected, namely in a disconnected state, so as to simulate an intermittent arc grounding fault process;
after the process of simulating the intermittent arc grounding fault is completed:
the remote control device 6 controls the disconnecting switch S1 to be opened, namely, in an off state, controls the control switch S2 to be opened, namely, in an off state, and controls the grounding switch S3 to be closed, namely, in an on state.
With the above-described simulation process, occurrence and extinction of the intermittent arc ground fault can be achieved by operating the remote control device 6.
The information generated by the fault simulation means 2 is further determined as an intermittent arc-to-ground fault by the data detection means 4 and further processed by the fault handling means 3.
The data detection device 4 is used for detecting zero sequence voltage, phase current signals and intermittent arcs generated when the fault simulation device 2 simulates the occurrence of the intermittent arc ground fault in real time, filtering the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs, and judging the ground fault after obtaining corresponding transient components;
the data detection device 4 detects intermittent arc ground faults, and specifically comprises:
the data detection device 4 detects the zero sequence voltage, the phase current signal and the intermittent arc generated when the fault simulation device 2 simulates the intermittent arc ground fault in real time;
when the intermittent arc grounding fault is simulated, the corresponding information is detected by the data detection device 4, and the fault is further determined to be the intermittent arc grounding fault through analyzing the detected data such as zero sequence voltage, phase current and the like;
processing the measured current through a filter with the frequency of AHz, wherein the current passing through the filter almost only contains transient quantity appearing in the intermittent arc grounding fault;
processing the measured voltage through a filter with a frequency of AHz, wherein the voltage through the filter almost only contains transient quantity appearing in the intermittent arc ground fault;
recording the zero sequence voltage transient magnitude values at a plurality of frequency points after being processed by the filter as U mi The phase angle is denoted as ω i ，i＝1,2,..k，k is the number of frequency points;
the phase current transient magnitude values at a plurality of frequency points after being processed by the filter are recorded as U mj The phase angle is recorded as ω' j ；
Taking y = c = j = i =1,2,. K, the data detection apparatus 4 calculates and compares the phase current transient amount corresponding to the frequency point i with the zero sequence voltage transient amount as follows:
calculating the phase angle difference omega between the phase current transient quantity and the zero sequence voltage transient quantity c I.e. calculating ω c ＝ω’ j- ω I ,；
The zero sequence voltage transient state quantity amplitude value U mi With it predetermine amplitude U' mi Comparing;
the current transient magnitude U mj With it predetermine amplitude U' mj Comparing;
the difference omega of the phase angles c With its preset value omega y Comparing;
in specific implementation, the preset value is a numerical value obtained by randomly grouping, calculating and averaging multipoint frequencies selected through band-pass filtering after the intermittent arc ground fault is determined.
Judging the intermittent arc ground fault according to the calculation and comparison results, and when the intermittent arc ground fault is judged, sending a signal determined as the intermittent arc ground fault to the fault processing device 3, specifically: if U appears mi ＜U’ mi 、U mj ＜U’ mj Or ω, or ω c When the arc fault is within the preset range, the intermittent arc grounding fault is judged to exist.
And the fault processing device 3 is used for processing the intermittent arc grounding fault by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel.
After receiving the signal which is sent by the data detection device 4 and determined as the intermittent arc grounding fault, the fault processing device 3 accesses the arc suppression coil grounding device to the main circuit where the grounding fault device 5 is located, compensates the grounding capacitance current of the grounding fault device 5 by using the arc suppression coil grounding device, and limits the system overvoltage;
then the data detection device 4 continuously detects the signal of the fault simulation device 2, if the signal which is determined to be the intermittent arc grounding fault and sent by the data detection device 4 disappears, that is, the intermittent arc grounding fault is considered to be absent, the simulation system recovers to normal operation, otherwise, the intermittent arc grounding fault still exists, and the fault cannot be eliminated through the arc suppression coil grounding device compensation, then:
firstly, compensating grounding capacitance current by adopting an arc suppression coil grounding device, and suppressing system overvoltage;
and the compensation value and the limiting value are set through parameters of a specific system and arc suppression coil related values are calculated.
And then, a small resistor grounding device is adopted to directly connect the small resistor with the bus, so that a grounding fault line, namely a main line where the grounding fault device 5 is located, is subjected to protection tripping, and faults are eliminated.
The actual fault processing device 3 is selected to carry out corresponding fault processing in the simulation system.
Further preferably, the fault handling device 3 includes a small resistance grounding device and an arc suppression coil grounding device connected in parallel to the same bus, specifically:
two wires led out from the bus, one is connected with the arc suppression coil grounding device, the other is connected with the small resistance grounding device, and the outgoing wires of the two are connected, so that the two devices are in a parallel connection state.
The small resistance value of the small resistance grounding device is between 15 and 25 omega.
Example two
The invention relates to a simulation method for automatically detecting and processing an intermittent arc ground fault, which comprises the following steps:
step 1, controlling a plurality of switches to simulate the occurrence and disappearance of intermittent earth faults;
and 2, detecting zero sequence voltage, phase current signals and the intermittent arc generated when the simulated intermittent arc ground fault occurs, filtering the zero sequence voltage and the phase current signals according to transient components in the intermittent arc to obtain corresponding transient components, then judging the ground fault, and when the intermittent arc ground fault is judged, adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel to process the intermittent arc ground fault.
Further preferably, step 2 performs the following intermittent arc ground fault detection operations:
step 21, detecting zero sequence voltage, phase current signals and intermittent electric arc generated when the ground fault of the simulated intermittent electric arc occurs in real time;
when an instruction for simulating the intermittent arc ground fault is received, the intermittent arc ground fault is simulated, corresponding information is measured, and the fault is further determined to be the intermittent arc ground fault through analysis of data such as measured zero sequence voltage, phase current and the like;
step 22, setting the frequency of the filter as AHz, wherein AHz is the frequency in the transient component in the intermittent arc, and the frequency is the frequency contained in the transient component after passing through the band-pass filter;
selecting a proper range for the pass band of the band-pass filter;
processing the measured current through a filter having a frequency of AHz, the current through the filter containing substantially only transient events occurring in the intermittent arc ground fault;
processing the measured voltage through a filter with a frequency of AHz, wherein the voltage through the filter almost only contains transient quantity appearing in the intermittent arc ground fault;
marking the zero sequence voltage transient state quantity amplitude values at a plurality of frequency points after being processed by the filter as U mi The phase angle is denoted as ω i I =1,2,. K, k is the number of frequency points;
the phase current transient magnitude values at a plurality of frequency points after being processed by the filter are recorded as U mj The phase angle is recorded as ω' j ；
Step 24, taking y = c = j = i =1,2,. K, and calculating and comparing the phase current transient quantity corresponding to the frequency point i with the zero sequence voltage transient quantity as follows:
calculating the phase angle difference omega between the phase current transient quantity and the zero sequence voltage transient quantity c I.e. calculating ω c ＝ω’ j- ω I ,；
Zero sequence voltage transient magnitude U mi With it predetermine amplitude U' mi Comparing;
the current transient magnitude U mj With it predetermine amplitude U' mj Comparing;
the difference omega of the phase angles c With its preset value omega y Comparing;
in specific implementation, the preset value is a numerical value obtained by randomly grouping, calculating and averaging multipoint frequencies selected through band-pass filtering after the intermittent arc ground fault is determined.
Step 25, judging the intermittent arc ground fault according to the calculation and comparison results in the step 24, and sending a signal determined as the intermittent arc ground fault when the intermittent arc ground fault is judged, specifically: if U appears mi ＜U’ mi 、U mj ＜U’ mj Or ω, or ω c And when the arc voltage is within the preset range, judging that the intermittent arc grounding fault exists.
Further, a signal determined as an intermittent arc ground fault is transmitted in a high level form;
the preset range is set to-170 ° to 10 °.
And 2, processing the intermittent arc grounding fault by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel.
After receiving the signal which is determined to be the intermittent arc grounding fault, the following steps are carried out:
1) Connecting the arc suppression coil grounding device to a main circuit where the grounding fault device 5 is located, and compensating grounding capacitance current of the grounding fault device 5 by using the arc suppression coil grounding device to limit system overvoltage;
2) The signal when the simulation intermittent arc ground fault happens is continuously detected, if the signal determined as the intermittent arc ground fault disappears, namely the intermittent arc ground fault is considered to be absent, the simulation system recovers to normally operate, otherwise, the intermittent arc ground fault still exists, the fault cannot be eliminated through the compensation of the arc suppression coil grounding device, and then:
firstly, compensating grounding capacitance current by adopting an arc suppression coil grounding device, and suppressing system overvoltage;
and the compensation value and the limiting value are adjusted through parameters of a specific system and relevant values of the arc suppression coil are calculated.
And then, a small resistor grounding device is adopted to directly connect the small resistor with the bus, so that a grounding fault line, namely a main line where the grounding fault device 5 is positioned, is tripped out in a protection mode, and faults are eliminated.
Compared with the prior art, the invention has the beneficial effects that:
the invention detects zero sequence voltage and phase current signals generated when the intermittent earth fault occurs by simulating the intermittent arc earth fault, carries out filtering processing on the zero sequence voltage and phase current signals according to the transient frequency in the intermittent arc to obtain corresponding transient quantity, then carries out earth fault judgment, and adopts a small resistance grounding device and an arc suppression coil grounding device which are connected in parallel to process the intermittent earth fault, thereby realizing the simulation of the whole automatic detection, identification and processing process, further perfecting the processing mechanism of the sudden fault in the actual work and enhancing the capability of a power distribution network line for processing the earth fault;
the device can realize the automatic detection, identification and processing of the intermittent arc ground fault, has a simple structure, and can judge the intermittent arc ground fault on the basis of the amplitude and the phase of the quasi-transient change in the current and the zero sequence voltage at a typical transient frequency; when the earth fault is processed, the small resistor is put into operation, so that the fault expansion caused by the fact that the arc suppression coil cannot compensate the large current when the capacitance current is large can be avoided.
While the best mode for carrying out the invention has been described in detail and illustrated in the accompanying drawings, it is to be understood that the same is by way of illustration and example only and is not intended as a definition of the limits of the invention, for the purposes of promoting a better understanding of the principles of the invention, and for the purposes of limiting the scope of the invention. On the contrary, any improvement or modification made based on the spirit of the invention should fall within the scope of the invention. The structures, numbers, and the like shown in the drawings attached to the present specification are only used for matching with the contents disclosed in the specification, so as to enable those skilled in the art to understand and read the present invention, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, number, change of proportional relationship, or adjustment of size should still fall within the scope that the technical contents disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms such as "first" and "not" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship thereof may be made without substantial technical changes.
Claims (11)
1. A simulation system for automatically detecting and handling intermittent arc ground faults, characterized by:
the simulation system (1) comprises a fault simulation device (2), a fault processing device (3) and a data detection device (4);
the fault simulation device (2) is used for controlling a plurality of switches to simulate the occurrence and disappearance of intermittent earth faults;
the data detection device (4) is used for detecting zero sequence voltage, phase current signals and intermittent arcs generated when the fault simulation device (2) simulates the occurrence of the intermittent arc ground fault, and filtering the zero sequence voltage and the phase current signals according to transient components in the intermittent arcs to obtain corresponding transient components and then judge the ground fault;
and the fault processing device (3) is used for processing the intermittent arc grounding fault by adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel when the data detection device (4) judges the intermittent arc grounding fault.
2. The simulation system for automatically detecting and handling intermittent arc ground faults as claimed in claim 1, wherein:
the fault simulation device (2) comprises an isolating switch (S1), a control switch (S2), a grounding switch (S3), a protective resistor (R1), a grounding fault device (5) and a remote control device (6);
the head end of the protective resistor (R1) is connected with the tail end of the control switch (S2);
one end of the ground fault device (5) is grounded, and the other end of the ground fault device is connected with the tail end of the protective resistor (R1);
the head end of the control switch (S2) is connected with the tail end of the isolating switch (S1) and the head end of the grounding switch (S3);
the tail end of the grounding switch (S3) is grounded, and the head end of the isolating switch (S1) is connected with a data monitoring device;
the remote control device (6) controls the on and off of the isolating switch (S1), the control switch (S2) and the grounding switch (S3) so as to simulate the occurrence and disappearance of intermittent arc grounding faults.
3. The simulation system for automatically detecting and handling intermittent arc ground faults as claimed in claim 2, wherein:
before the simulation system (1) is operated, the switch states in the fault simulation device (2) are as follows:
the isolating switch (S1) is in an off state, the control switch (S2) is in an off state, and the grounding switch (S3) is in an on state, so that the tail end of the isolating switch (S1) is grounded.
4. The simulation system for automatically detecting and handling intermittent arc ground faults as claimed in claim 2, wherein:
in the fault simulation device (2), when the intermittent arc grounding fault is to be simulated, the remote control device (6) is used as an initial action device to control the disconnecting switch (S1) to be closed, the control switch (S2) to be closed and the grounding switch (S3) to be opened so as to simulate the intermittent arc grounding fault process;
after the process of simulating the intermittent arc ground fault is completed, the remote control device (6) controls the disconnecting switch (S1) to be disconnected, controls the control switch (S2) to be disconnected and controls the grounding switch (S3) to be closed.
5. The simulation system for automatically detecting and handling intermittent arc ground faults as claimed in claim 1, wherein:
in the fault processing device (3), the small resistor value of the small resistor grounding device is between 15 and 25 omega.
6. A simulation method for automatically detecting and processing intermittent arc grounding faults is characterized in that:
the method comprises the following steps:
step 1, controlling a plurality of switches to simulate the occurrence and disappearance of intermittent earth faults;
and 2, detecting zero sequence voltage, phase current signals and the intermittent arc generated when the simulated intermittent arc ground fault occurs, filtering the zero sequence voltage and the phase current signals according to transient components in the intermittent arc to obtain corresponding transient components, then judging the ground fault, and when the intermittent arc ground fault is judged, adopting a small-resistance grounding device and an arc suppression coil grounding device which are connected in parallel to process the intermittent arc ground fault.
7. The analog method for automatically detecting and handling intermittent arc ground faults of claim 6, wherein:
step 2, detecting zero sequence voltage, phase current signals and the intermittent arc generated when the simulated intermittent arc ground fault occurs, filtering the zero sequence voltage and the phase current signals according to transient components in the intermittent arc, and judging the ground fault after obtaining corresponding transient components, specifically comprising:
step 21, detecting zero sequence voltage, phase current signals and intermittent electric arc generated when the ground fault of the simulated intermittent electric arc occurs in real time;
step 22, setting the frequency of the filter as AHz, wherein AHz is the frequency in the transient component in the intermittent arc, and the frequency is the frequency contained in the transient component after passing through the band-pass filter;
step 23, the filter filters the zero-sequence voltage and phase current signals, the phase current passing through the filter only contains the transient quantity appearing in the intermittent arc ground fault, and the zero-sequence voltage passing through the filter only contains the transient quantity appearing in the intermittent arc ground fault;
the zero sequence voltage transient magnitude value at the frequency point i after being processed by the filter is recorded as U mi The phase angle is denoted as ω i I =1,2,. K, k is the number of frequency points;
the phase current transient magnitude at the frequency point I after being processed by the filter is taken as I mj The phase angle is recorded as ω' j ；
Step 24, taking y = c = j = i =1,2,. K, and calculating and comparing the phase current transient component corresponding to the frequency point i with the zero sequence voltage transient component;
and 25, judging the intermittent arc ground fault according to the calculation and comparison result in the step 24, and sending a signal determined as the intermittent arc ground fault when the intermittent arc ground fault is judged.
8. The analog method for automatically detecting and handling intermittent arc ground faults of claim 7, wherein:
in step 24, y = c = j = i =1,2,. K is taken, and the phase current transient quantity corresponding to the frequency point i and the zero sequence voltage transient quantity are calculated and compared as follows:
calculating the phase angle difference omega between the phase current transient quantity and the zero sequence voltage transient quantity c ，ω c ＝ω’ j- ω I, ；
The zero sequence voltage transient state quantity amplitude value U mi With it predetermine amplitude U' mi Comparing;
amplitude I of current transient component mj And preset amplitude I 'thereof' mj Comparing;
the difference omega of the phase angles c With its preset value omega y And (6) comparing.
9. The analog method for automatically detecting and handling intermittent arc ground faults of claim 8, wherein:
in step 25, if U appears in the calculation and comparison result of step 24 mi ＜U’ mi 、I mj ＜I’ mj Or ω c And within a preset range, judging that the intermittent arc grounding fault exists.
10. The simulation system for automatically detecting and handling intermittent arc ground faults of claim 6, wherein:
in step 2, after receiving the signal determined to be the intermittent arc ground fault, the following steps are carried out:
1) Connecting an arc suppression coil grounding device into a main circuit where the ground fault device (5) is located, and compensating the grounding capacitance current of the ground fault device (5) by using the arc suppression coil grounding device to limit system overvoltage;
2) And continuously detecting a signal when the simulated intermittent arc ground fault occurs, if the signal determined as the intermittent arc ground fault disappears, namely the intermittent arc ground fault is considered to be absent, the simulation system recovers to normal operation, otherwise, the intermittent arc ground fault still exists, and the fault cannot be eliminated through the compensation of the arc suppression coil grounding device, so that the fault is eliminated by introducing the small-resistance grounding device.
11. The simulation system for automatically detecting and handling intermittent arc ground faults of claim 10, wherein:
in 2), intermittent arc ground fault still exists, when the fault can not be eliminated through arc suppression coil grounding device compensation, the arc suppression coil grounding device is firstly adopted to compensate grounding capacitance current, system overvoltage is suppressed, and then the small resistance grounding device is adopted to directly connect the small resistance with the bus, so that a grounding fault circuit, namely a main circuit where the grounding fault device (5) is located, is tripped out in a protection mode, and the fault is eliminated.
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