CN113884817B - Single-phase grounding fault grounding searching method for small-current grounding system - Google Patents
Single-phase grounding fault grounding searching method for small-current grounding system Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a single-phase grounding fault grounding searching method of a small-current grounding system, which comprises the following steps: 1. detecting single-phase grounding characteristic quantity; 2. judging whether the single phase is grounded; if no single-phase grounding exists, judging whether the grounding in the step 7 is reset or not; if single-phase grounding occurs, continuing to step 3; 3. acquiring data of a distribution network regulation system; 4. acquiring data of a main network regulation system; 5. update the pull Lu Xu bit table; 6. executing a single-phase grounding intelligent detection program; 7. and judging whether the single-phase grounding is reset or not. The invention improves the existing single-phase grounding fault processing technology, is beneficial to the dispatch control operation of the distribution network, and is beneficial to the analysis, command and processing of the single-phase grounding fault of the small-current grounding system when the analysis personnel grasp the single-phase grounding fault, thereby providing a new technical scheme for the single-phase grounding fault processing of the small-current grounding system.
Description
Technical Field
The invention relates to a single-phase grounding fault grounding finding method of a small-current grounding system, and belongs to the field of power distribution network grounding fault processing.
Background
The low-current grounding system is widely used in a power distribution network system at present due to the excellent power supply reliability; after a small-current grounding system generates a single-phase grounding fault, abnormal operation of the power distribution network is still one of factors causing weak links of the current power distribution network, and the single-phase grounding fault can cause two-phase-to-phase short circuit faults of the same line or multiple points and different phases of short circuits of different lines, so that a power failure event occurs; the occurrence of single-phase earth faults can cause the balance of the original capacitance and inductance of the power distribution network to be broken, arc grounding can be caused, resonance overvoltage can be caused even seriously, insulation of power equipment is damaged, and the accident range is enlarged.
At present, most distribution networks are provided with distribution automation systems, and the single-phase grounding treatment of a small-current grounding system mainly depends on an in-situ automatic line selection switch to judge a fault line or manually judged by a dispatcher; the existing in-situ feeder automation system has the situation that a feeder is selected by mistake, and the centralized feeder automation system has the situation that the single-phase grounding situation does not act; unsafe factors such as unreasonable road pulling sequence exist in the manual single-phase grounding searching link; the traditional single-phase grounding treatment mode of the low-current grounding system can cause the increase of the probability of external power failure of uncertainty.
Under the condition that single-phase grounding occurs in the low-current grounding system, misoperation or refusal of a distribution network switch controlled by a new generation distribution automation system for arranging local feeder automation and centralized feeder automation can not accurately complete single-phase grounding fault positioning, isolation and recovery of power supply of a non-fault area, so that how to accurately and rapidly search single-phase grounding faults of the low-current grounding system becomes a technical problem to be solved in operation scheduling of a power distribution network.
Disclosure of Invention
The invention provides a single-phase grounding fault grounding finding method of a small-current grounding system, and aims to better solve the problem of carrying out grounding finding on the single-phase grounding fault of the small-current grounding system.
The technical solution of the invention is as follows: a single-phase earth fault earth finding method of a small-current earth system comprises the following steps:
1. detecting single-phase grounding characteristic quantity;
2. judging whether the single phase is grounded; if no single-phase grounding exists, judging whether the grounding in the step 7 is reset or not; if single-phase grounding occurs, continuing to step 3;
3. acquiring data of a distribution network regulation system;
4. acquiring data of a main network regulation system;
5. update the pull Lu Xu bit table;
6. executing a single-phase grounding intelligent detection program;
7. and judging whether the single-phase grounding is reset or not.
Further, the single-phase grounding fault grounding searching method of the low-current grounding system further comprises the following steps:
8. if all outgoing lines of the substation bus are subjected to ground finding by the single-phase grounding intelligent judging program, but the single-phase grounding still exists, judging that the bus is faulty;
9. the single-phase grounding intelligent studying and judging program detects a single-phase grounding resetting signal, namely, the program is automatically exited.
Further, the single-phase grounding characteristic amount detection specifically includes: and (3) inspecting the main network regulation and control system according to the sampling step length of 2 seconds, and continuously detecting single-phase grounding fault signals of the low-current grounding system.
Further, the detection mode of the single-phase earth fault signal comprises the following steps:
if it isThe action of a 10kV/35kV bus grounding alarm signal appears at moment, and the signal is recorded as +.>；
If it isThe action of a 10kV/35kV line grounding alarm signal appears at moment, and the signal is recorded as +.>；
If it isGenerating bus voltage at moment, wherein the amplitude of one phase voltage is less than or equal to 0.7 times of phase voltage, and the other two phase voltage is more than or equal to 1.2 times of phase voltage, recording the signal as +.>；
When one or more than one of the conditions occurs in the main network regulation system, the main network regulation system records a bus or a distribution line with single-phase grounding fault, and completes the single-phase grounding characteristic quantityAnd recording the moment of the first occurrence of the single-phase grounding characteristic>：
；
。
Further, the determining whether the single phase is grounded specifically includes:
if the 10kV/35kV bus grounding alarm signal action occurs and the signal duration is longer than 4 minutes, judging that the bus has single-phase grounding fault;
if the '10 kV/35kV line grounding alarm signal action' occurs and the signal duration is longer than 4 minutes, judging that the line has single-phase grounding fault;
if the amplitude of one phase voltage of the bus voltage is smaller than or equal to 0.7 times of the phase voltage, the other two phase voltage is larger than or equal to 1.2 times of the phase voltage, and the duration of the voltage characteristic representation is longer than 4 minutes, judging that the bus has single-phase grounding fault;
when one or more than one of the conditions occurs in the main network regulation system, the main network regulation system records a bus or a distribution line where the single-phase grounding fault occurs, and the judgment of the single-phase grounding fault is completed.
Further, the acquiring the data of the distribution network regulation system specifically includes:
detecting the first occurrence time of single-phase grounding characteristic quantity according to a patrol distribution network regulation and control system with a sampling step length of 2 secondsA correlation alarm signal within 240 seconds before and after;
if the 'distribution network switch short circuit alarming action' occurs, the line pull priority of the distribution network switch is set；
If the 'distribution network switch overcurrent alarm action' occurs, setting the line pull priority of the distribution network switch；
If the zero sequence overcurrent alarm action of the distribution network switch occurs, setting the line pull priority of the distribution network switch as；
If overload alarm action of the distribution network switch occurs, the line of the distribution network switch is connectedPull priority is set to。
Further, the acquiring the data of the main network regulation system specifically includes: according to the main network dispatching automation system of the patrol area with the sampling step length of 2 seconds, if the line grounding alarm action occurs, the line pulling priority is set as follows。
Further, the updating the pull Lu Xu bit table specifically includes: the capacitor pull priority is set toThe method comprises the steps of carrying out a first treatment on the surface of the The no-load line pull priority is set to +.>The method comprises the steps of carrying out a first treatment on the surface of the The priority of the pull sequence list is according to +.>Setting; the pull sequence table supports manual adjustment through a human-machine interface (HMI).
Further, the executing the single-phase grounding intelligent detection program specifically includes: performing ground searching on the fault bus according to the sequence in the pull-out sequence table, wherein the ground searching comprises pulling-out and closing of an outgoing line switch on the fault bus; if the line isAfter the outlet switch is pulled open, the single-phase grounding characteristic quantity disappears, and then the single-phase grounding intelligent detection program is terminated; if the single-phase grounding characteristic quantity still exists after the grounding search is carried out on all outgoing lines of the fault bus, the single-phase grounding characteristic quantity is not closed after the outgoing line switch of one line is pulled, and if the line is pulled +.>Single phase grounding feature after outlet switchIf the quantity disappears, the line outlet switch which is pulled before the closing is tried to be closed in reverse order, and the line is tried to be closed>After the outgoing line switch, the single-phase grounding characteristic quantity appears again, and the line is pulled open +.>The outlet switch is used for terminating execution of the single-phase grounding intelligent detection program at the same time; if all the line outlet switches of the fault bus are pulled open and then single-phase earth faults still occur, the fault bus is considered to be single-phase earth faults.
Further, the determination of whether the single-phase grounding is reset specifically includes: according to the remote signaling signals in the patrol main network regulation and control system with the sampling step length of 2 seconds, when the 10kV/35kV bus grounding alarm signals are recovered, judging that the single-phase grounding faults are recovered; and after the single-phase earth fault is reset, the single-phase earth fault searching is exited.
The invention has the beneficial effects that:
1) The method can adapt to multi-scene single-phase grounding faults of the power distribution network, quickly perform grounding search on the single-phase grounding faults of the power distribution network, judge the line with single-phase grounding, improve the quick disposal capacity of the single-phase grounding faults of the power distribution network and improve the accurate disposal level of the single-phase grounding faults of the power distribution network;
2) The short-time power failure time of a non-ground line user in the process of searching the ground line by the single-phase grounding of the distribution network and the complexity of remote control operation in the process of searching the ground line by the line are effectively reduced, the power supply reliability is improved, and the experience, the acquisition and the satisfaction of power customers are improved;
3) The operation data of the existing power distribution network is comprehensively utilized, single-phase earth faults of the power distribution network are timely processed, the possibility that an error line selection result occurs between an automatic line selection switch and a small-current line selection device of a transformer substation is effectively avoided, the voltage of the power distribution network is recovered to a normal level at the first time, and the safe and economic operation of the power distribution network is ensured;
4) The single-phase grounding fault grounding searching and processing method for the low-current grounding system has strong adaptability, and can be suitable for a neutral point ungrounded system and a neutral point arc suppression coil grounding system;
5) The single-phase grounding fault grounding finding and processing method of the small-current grounding system does not need to additionally arrange new equipment, and has good economical efficiency;
6) The method improves the existing single-phase grounding fault processing technology, is beneficial to the dispatch control operation of the distribution network, and is beneficial to an analyst to analyze, command and process the single-phase grounding fault of the small-current grounding system when the single-phase grounding fault occurs, thereby providing a new technical scheme for the single-phase grounding fault processing of the small-current grounding system.
Drawings
FIG. 1 is a flow chart of a single-phase earth fault ground finding for a low current ground system.
Fig. 2 is a feedback diagram of fault signal characteristics of the distribution network regulation system.
Fig. 3 is a feedback diagram of the fault signal characteristic quantity of the main network regulation system.
Fig. 4 is a primary wiring diagram of a transformer substation in a distribution network in an embodiment.
Fig. 5 is a primary wiring diagram of an in-situ distribution automation line in an embodiment.
Detailed Description
A single-phase earth fault earth finding method of a small-current earth system comprises the following steps:
1. detecting single-phase grounding characteristic quantity;
2. judging whether the single phase is grounded; if the single phase is not grounded, judging whether the grounding is restored in the step 7; if the single phase is grounded, continuing to carry out the step 3;
3. acquiring data of a distribution network regulation system;
4. acquiring data of a main network regulation system;
5. update the pull Lu Xu bit table;
6. executing a single-phase grounding intelligent detection program;
7. a determination is made as to whether the ground has returned.
The single-phase grounding fault grounding searching method of the low-current grounding system further comprises the following steps:
8. if all outgoing lines of the substation bus are subjected to ground finding by the single-phase grounding intelligent judging program, but the single-phase grounding still exists, judging that the bus is faulty;
9. the single-phase grounding intelligent studying and judging program detects a single-phase grounding resetting signal, namely, the program is automatically exited.
The single-phase grounding characteristic quantity detection specifically comprises the following steps: according to the inspection main network regulation system with the sampling step length of 2 seconds, continuously detecting single-phase grounding fault signals of the distribution network system; the single-phase earth fault signal is detected as follows:
if it isThe action of a 10kV/35kV bus grounding alarm signal appears at moment, and the signal is recorded as +.>；
If it isThe action of a 10kV/35kV line grounding alarm signal appears at moment, and the signal is recorded as +.>；
If it isGenerating bus voltage at moment, wherein the amplitude of one phase voltage is less than or equal to 0.7 times of phase voltage, and the other two phase voltage is more than or equal to 1.2 times of phase voltage, recording the signal as +.>；
When one or more than one of the conditions occurs in the main network regulation system, the main network regulation system records a bus or a distribution line with single-phase grounding fault, and completes the single-phase grounding characteristic quantityAnd recording the moment of the first occurrence of the single-phase grounding characteristic>；
；
。
The judging whether the single phase is grounded specifically comprises the following steps:
if the 10kV/35kV bus grounding alarm signal action occurs and the signal duration is longer than 4 minutes, judging that the bus has single-phase grounding fault;
if the '10 kV/35kV line grounding alarm signal action' occurs and the signal duration is longer than 4 minutes, judging that the line has single-phase grounding fault;
if the amplitude of one phase voltage of the bus voltage is smaller than or equal to 0.7 times of the phase voltage, the other two phase voltage is larger than or equal to 1.2 times of the phase voltage, and the duration of the voltage characteristic representation is longer than 4 minutes, judging that the bus has single-phase grounding fault;
when one or more than one of the conditions occurs in the main network regulation system, the main network regulation system records a bus or a distribution line where the single-phase grounding fault occurs, and the judgment of the single-phase grounding fault is completed.
The acquiring the data of the distribution network regulation system specifically comprises the following steps: detecting the first occurrence time of single-phase grounding characteristic quantity according to a patrol distribution network regulation and control system with a sampling step length of 2 secondsA correlation alarm signal within 240 seconds before and after;
if 'distribution network switch short circuit alarm' appearsAction ", the line pull priority of the distribution network switch is set；
If the 'distribution network switch overcurrent alarm action' occurs, setting the line pull priority of the distribution network switch；
If the zero sequence overcurrent alarm action of the distribution network switch occurs, setting the line pull priority of the distribution network switch as；
If the overload alarm action of the distribution network switch occurs, setting the line pull priority of the distribution network switch。
And recording an overcurrent alarm of a distribution network switch, a zero-sequence overcurrent alarm of the distribution network switch, an overload alarm of the distribution network switch and a short-circuit alarm signal of the distribution network switch in the distribution network regulation and control system, and tracing a distribution network line to which the switch signal belongs according to the signal attribute.
The obtaining the data of the main network regulation system specifically comprises the following steps: according to the main network dispatching automation system of the patrol area with the sampling step length of 2 seconds, if a line grounding alarm appears, the line pulling priority is set to be set as followsThe method comprises the steps of carrying out a first treatment on the surface of the The substation is provided with a single-phase grounding line selection device, and a single-phase grounding line selection signal of the substation is accessed to a main station of a dispatching automation system to participate in intelligent generation of a drawing line sequence table; the main network regulation system feeds back a bus phase voltage signal, an arc suppression coil action signal, a bus grounding alarm signal and a line grounding alarm action signal of the transformer substation.
The update pull Lu Xu bit table, concrete packageThe method comprises the following steps: the capacitor pull priority is set toThe method comprises the steps of carrying out a first treatment on the surface of the The no-load line pull priority is set to +.>。
The priority of the pull sequence list is according toSetting; the pull sequence table supports manual adjustment through a human-machine interface (HMI).
The executing single-phase grounding intelligent detection program specifically comprises the following steps: performing ground searching on the fault bus according to the sequence existing in the single-phase ground pull sequence table, wherein the ground searching comprises the opening and closing of an outgoing line switch on the fault bus; if the line isAfter the outlet switch is pulled open, the single-phase grounding characteristic quantity disappears, and then the single-phase grounding intelligent detection program is terminated; if the single-phase grounding characteristic quantity still exists after the grounding search is carried out on all outgoing lines of the fault bus, the single-phase grounding characteristic quantity is not closed after the outgoing line switch of one line is pulled, and if the line is pulled +.>After the outgoing line switch, the single-phase grounding characteristic quantity disappears, and the line outgoing line switch which is pulled before being closed is tried to be closed in reverse order, and the line is tried to be closed>After the outgoing line switch, the single-phase grounding characteristic quantity appears again, and the line is pulled open +.>The outlet switch is used for terminating execution of the single-phase grounding intelligent detection program at the same time; if the single-phase grounding fault still occurs after all the line outlet switches of the fault bus are pulled open, the single-phase grounding fault occursIt is considered that a single-phase earth fault occurs in the bus.
The judging whether the single-phase grounding is reset or not specifically comprises the following steps: and (3) according to the remote signaling signals in the patrol main network regulation and control system with the sampling step length of 2 seconds, when the 10kV/35kV bus grounding alarm signals are recovered, judging that the single-phase grounding faults are recovered. And after the single-phase earth fault is reset, the single-phase earth fault searching is exited.
Example 1
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a single-phase grounding fault grounding searching method of a small-current grounding system; in fig. 4, the 10kV bus of the transformer substation is grounded by metallic phase A, namely、/>、/>The three-phase voltage of the 10kV bus of the transformer substation is obviously changed.
The inspection distribution network regulation and control system is characterized in that the sampling step length is 2 seconds, and as shown in figure 2, no feedback signal exists.
According to the inspection main network regulation system with the sampling step length of 2 seconds, as shown in fig. 3, continuously detecting single-phase grounding fault signals of the distribution network system; detecting three-phase voltage of bus in main network regulation system、/>、/>And the '10 kV/35kV bus grounding alarm signal action' appears, and then the bus is judged to have single-phase grounding fault.
Updating the pull Lu Xu bit table specifically includes: the capacitor pull priority is set toThe method comprises the steps of carrying out a first treatment on the surface of the The no-load line pull priority is set to +.>The method comprises the steps of carrying out a first treatment on the surface of the The priority of the pull sequence list is according to +.>Setting; the pull sequence list supports manual adjustment through a human-machine interface (HMI); in this embodiment 1, the pull sequence table is set as follows: 1) A capacitor connected to the bus; 3) No-load and light-load circuits; 4) An overhead line and overhead cable hybrid line; 5) A cable circuit; 6) Other lines.
Executing a single-phase grounding intelligent detection program, as shown in fig. 4, performing grounding searching on the fault bus according to the sequence existing in the single-phase grounding pull-out sequence table, wherein the grounding searching comprises the opening and closing of an outlet switch in the fault bus; if the single-phase grounding characteristic quantity disappears after the line 110 outlet switch is pulled, terminating the single-phase grounding intelligent detection program; judging the line with single-phase earth fault as 110 lines; if the single-phase grounding characteristic quantity still exists after all the line outlet switches of the fault bus are subjected to grounding searching, the single-phase grounding characteristic quantity is not closed after one line outlet switch is pulled, if the single-phase grounding characteristic quantity disappears after the line 112 outlet switch is pulled, the line outlet switch which is pulled before being pulled is tested on in reverse order, the single-phase grounding characteristic quantity appears again after the line 120 outlet switch is tested on, the line 120 outlet switch is pulled, meanwhile, the execution of the single-phase grounding intelligent detection program is stopped, and the lines with single-phase grounding faults are judged to be 112 lines and 120 lines.
Example 2
As shown in FIG. 1, a low current grounding system is single-phase groundedThe obstacle ground searching method. In fig. 4, the 10kV bus of the transformer substation is grounded by metallic phase A, namely、/>、/>The three-phase voltage of the 10kV bus of the transformer substation is obviously changed.
The inspection distribution network regulation and control system is characterized in that the sampling step length is 2 seconds, as shown in figure 2; if the "11201 distribution network switch overcurrent alarm action", "11201 distribution network switch zero sequence overcurrent alarm action", "11201 distribution network switch overload alarm action", "11201 distribution network switch short circuit alarm action" are shown in fig. 5, the 112 line pull priority is set to be the highest.
According to the inspection main network regulation system with the sampling step length of 2 seconds, as shown in fig. 3, continuously detecting single-phase grounding fault signals of the distribution network system; detecting three-phase voltage of bus in main network regulation system、/>、/>And the '10 kV/35kV bus grounding alarm signal action' appears, and then the bus is judged to have single-phase grounding fault.
When the '10 kV/35kV 110 line grounding alarm signal action' occurs in the main network regulation and control system, the single-phase grounding intelligent research and judgment program judges that the 110 line has an A-phase grounding fault, and meanwhile, the single-phase grounding pull-up sequence table is updated, and the priority is set to be the next highest.
And confirming updating the single-phase grounding pull sequence list through a human-computer interaction interface HMI. The pull sequence bit table in this embodiment 2 is 112, 110, 120, 116, 122, 114, 118 lines.
Executing a single-phase grounding intelligent detection program, as shown in fig. 4, performing grounding searching on the fault bus according to the sequence existing in the single-phase grounding pull-out sequence table, wherein the grounding searching comprises the opening and closing of an outlet switch in the fault bus; if the single-phase grounding feature disappears after the line 112 outlet switch is pulled, the single-phase grounding intelligent detection procedure is terminated. Judging the line with single-phase earth fault as 112 line; if the single-phase grounding characteristic quantity still exists after all the line outlet switches of the fault bus are subjected to grounding searching, the single-phase grounding characteristic quantity is not closed after one line outlet switch is pulled, if the single-phase grounding characteristic quantity disappears after the line 110 outlet switch is pulled, the line outlet switch which is pulled before the line outlet switch is closed is tested in reverse sequence, the single-phase grounding characteristic quantity appears again after the line 120 outlet switch is tested, the line 120 outlet switch is pulled, the execution of the single-phase grounding intelligent detection program is stopped, and the lines with single-phase grounding faults are judged to be 110 lines and 120 lines.
After the single-phase grounding pull sequence table is determined, a single-phase grounding intelligent judging program executes grounding searching, and finally a line is locked 112 to generate A-phase grounding; the short-time power failure time of the non-grounding line in the pull-circuit searching and grounding process can be controlled within 10 seconds, and single-phase grounding fault searching can be rapidly realized.
Claims (6)
1. The single-phase earth fault grounding searching method for the low-current grounding system is characterized by comprising the following steps of:
1) Detecting single-phase grounding characteristic quantity;
2) Judging whether the single phase is grounded; if no single-phase grounding exists, judging whether the grounding in the step 7) is reset or not; if single-phase grounding occurs, continuing to step 3);
3) Acquiring data of a distribution network regulation system;
4) Acquiring data of a main network regulation system;
5) Update the pull Lu Xu bit table;
6) Executing a single-phase grounding intelligent detection program;
7) Judging whether the single-phase grounding is reset or not;
the acquiring the data of the distribution network regulation system specifically comprises the following steps:
detecting the moment F of the first occurrence of the single-phase grounding characteristic quantity according to a patrol distribution network regulation and control system with the sampling step length of 2 seconds 0 A correlation alarm signal within 240 seconds before and after;
if the 'distribution network switch short circuit alarming action' occurs, setting the line pull priority of the distribution network switch to F 1 ；
If the 'distribution network switch overcurrent alarm action' occurs, setting the line pull priority of the distribution network switch to F 2 ；
If the zero sequence overcurrent alarm action of the distribution network switch occurs, setting the line pull priority of the distribution network switch to F 3 ；
If the overload alarm action of the distribution network switch occurs, setting the line pull priority of the distribution network switch to F 6 ；
The obtaining the data of the main network regulation system specifically comprises the following steps: according to the main network dispatching automation system of the patrol area with the sampling step length of 2 seconds, if the line grounding alarm action occurs, setting the line pulling priority as F 4 ；
The update pull Lu Xu bit table specifically comprises: capacitor pull priority is set to F 0 The method comprises the steps of carrying out a first treatment on the surface of the The no-load line pull priority is set to F 5 The method comprises the steps of carrying out a first treatment on the surface of the Priority of the pull sequence table according to [ F 0 ，F 1 ，F 2 ，F 3 ，F 4 ，F 5 ，F 6 ]Setting; the pull way sequence list supports manual adjustment through a man-machine interaction interface;
the executing single-phase grounding intelligent detection program specifically comprises the following steps: performing ground searching on the fault bus according to the sequence in the pull-out sequence table, wherein the ground searching comprises pulling-out and closing of an outgoing line switch on the fault bus; if line L 1 After the outlet switch is pulled open, the single-phase grounding characteristic quantity disappears, and then the single-phase grounding intelligent detection program is terminated; if the single-phase grounding characteristic quantity still exists after all outgoing lines of the fault bus are subjected to grounding searching, each line is pulled apartThe outlet switch is not closed any more after the outlet switch is opened, if the line L is pulled open 2 After the outgoing line switch, the single-phase grounding characteristic quantity disappears, and the line outgoing line switch which is pulled before being closed is tested in reverse order, and the upper line L is tested 3 After the outgoing line switch appears the single-phase grounding characteristic quantity again, the line L is pulled open 3 The outlet switch is used for terminating execution of the single-phase grounding intelligent detection program at the same time; if all the line outlet switches of the fault bus are pulled open and then single-phase earth faults still occur, the fault bus is considered to be single-phase earth faults.
2. The method for finding a single-phase earth fault of a low-current earth system according to claim 1, further comprising the steps of:
8) If all outgoing lines of the substation bus are subjected to ground finding by the single-phase grounding intelligent judging program, but the single-phase grounding is still present, judging that the bus is faulty;
9) And the single-phase grounding intelligent studying and judging program detects a single-phase grounding resetting signal, namely the program is automatically exited.
3. The method for searching the single-phase grounding fault of the low-current grounding system according to claim 1 or 2, wherein the single-phase grounding characteristic quantity detection specifically comprises the following steps: and (3) inspecting the main network regulation and control system according to the sampling step length of 2 seconds, and continuously detecting single-phase grounding fault signals of the low-current grounding system.
4. A method for finding a single-phase ground fault of a low-current grounding system according to claim 3, wherein the detection mode of the single-phase ground fault signal comprises the following steps:
if T 1 The action of a 10kV/35kV bus grounding alarm signal appears at moment, and the signal is recorded as LF 1 ；
If T 2 The action of a 10kV/35kV line grounding alarm signal appears at moment, and the signal is recorded as LF 2 ；
If T 3 The bus voltage appears at any time, wherein the amplitude of one phase voltage is less than or equal to 0.7 times of the phase voltage, and the other phase voltageThe voltage of the outer two phases is more than or equal to 1.2 times of the voltage of the phases, and the signal is recorded as LF 3 ；
When one or more than one of the conditions occurs in the main network regulation system, the main network regulation system records a bus or a distribution line where a single-phase grounding fault occurs, completes detection of the single-phase grounding characteristic quantity LF, and records the moment T when the single-phase grounding characteristic quantity first occurs 0 ：
LF＝LF 1 ||LF 2 ||LF 3 ；
T 0 ＝min(T 1 ，T 2 ，T 3 )。
5. The method for searching the single-phase grounding fault of the low-current grounding system according to claim 1 or 2, wherein the step of judging whether the single phase is grounded comprises the following steps:
if the 10kV/35kV bus grounding alarm signal action occurs and the signal duration is longer than 4 minutes, judging that the bus has single-phase grounding fault;
if the '10 kV/35kV line grounding alarm signal action' occurs and the signal duration is longer than 4 minutes, judging that the line has single-phase grounding fault;
if the amplitude of one phase voltage of the bus voltage is smaller than or equal to 0.7 times of the phase voltage, the other two phase voltage is larger than or equal to 1.2 times of the phase voltage, and the duration of the voltage characteristic representation is longer than 4 minutes, judging that the bus has single-phase grounding fault;
when one or more than one of the conditions occurs in the main network regulation system, the main network regulation system records a bus or a distribution line where the single-phase grounding fault occurs, and the judgment of the single-phase grounding fault is completed.
6. The method for searching the single-phase grounding fault of the low-current grounding system according to claim 1 or 2, wherein the determination of whether the single-phase grounding is reset or not is carried out specifically comprises the following steps: according to the remote signaling signal in the patrol main network regulation and control system with the sampling step length of 2 seconds, when the 10kV/35kV bus grounding alarm signal is recovered, judging that the single-phase grounding fault is recovered; and after the single-phase earth fault is reset, the single-phase earth fault searching is exited.
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