CN113884817A - Single-phase earth fault grounding searching method for small current grounding system - Google Patents
Single-phase earth fault grounding searching method for small current grounding system Download PDFInfo
- Publication number
- CN113884817A CN113884817A CN202111251927.9A CN202111251927A CN113884817A CN 113884817 A CN113884817 A CN 113884817A CN 202111251927 A CN202111251927 A CN 202111251927A CN 113884817 A CN113884817 A CN 113884817A
- Authority
- CN
- China
- Prior art keywords
- phase
- grounding
- line
- bus
- fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a single-phase earth fault ground searching method of a low-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 is reset in the step 7; if single-phase grounding occurs, continuing to perform the step 3; 3. acquiring distribution network regulation and control system data; 4. acquiring data of a main network regulation and control system; 5. updating the pull-way sequence table; 6. executing a single-phase grounding intelligent detection program; 7. and judging whether the single-phase grounding is restored. The invention improves the existing single-phase earth fault processing technology, is beneficial to the dispatching control operation of the power distribution network, and is beneficial to analysis, command and processing of the small-current earth fault when the small-current earth fault occurs to an analyst, thereby providing a new technical scheme for the single-phase earth fault processing of the small-current earth system.
Description
Technical Field
The invention relates to a single-phase earth fault ground searching method for a low-current grounding system, and belongs to the field of earth fault processing of a power distribution network.
Background
The low-current grounding system is widely used in a power distribution network system at present due to the excellent power supply reliability; the abnormal operation of the power distribution network is still one of the factors causing the weak link of the current power distribution network after the single-phase earth fault occurs in the low-current earth system, and the occurrence of the single-phase earth fault may cause the inter-phase short circuit fault of two phases of the same line or the multi-point and out-phase short circuit of different lines, thereby causing the occurrence of a power failure event; the occurrence of single-phase earth faults can cause the balance of original capacitance and inductance of a power distribution network to be broken, arc light grounding can be caused, serious people even cause resonance overvoltage, the insulation of power equipment is damaged, and the accident range is enlarged.
At present, most power distribution networks are provided with a power distribution automation system, and the treatment of the single-phase grounding of a low-current grounding system mainly depends on an on-site automatic line selection switch to judge a fault line or is judged manually by a dispatcher; the existing local feeder automation system has the condition that a feeder is selected wrongly, and the centralized feeder automation system has the condition that the centralized feeder automation system does not work under the condition of single-phase grounding; unsafe factors such as unreasonable pulling sequence exist in the manual single-phase grounding searching link; the single-phase grounding processing mode of the traditional small-current grounding system can cause the probability of external power failure due to uncertainty to be increased.
Under the condition that single-phase grounding occurs in the low-current grounding system, the distribution network switch controlled by the new generation distribution automation system with local feeder automation and centralized feeder automation is arranged to be capable of being mistakenly operated or refused to operate, and single-phase grounding fault positioning, isolation and non-fault area power supply recovery cannot be accurately completed, so that how to accurately and quickly search the single-phase grounding fault of the low-current grounding system becomes a technical problem to be solved urgently in distribution network operation scheduling.
Disclosure of Invention
The invention provides a single-phase earth fault ground searching method for a low-current grounding system, and aims to better solve the problem of ground searching for the single-phase earth fault of the low-current grounding system.
The technical solution of the invention is as follows: a single-phase earth fault grounding searching method of a small current grounding 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 is reset in the step 7; if single-phase grounding occurs, continuing to perform the step 3;
3. acquiring distribution network regulation and control system data;
4. acquiring data of a main network regulation and control system;
5. updating the pull-way sequence table;
6. executing a single-phase grounding intelligent detection program;
7. and judging whether the single-phase grounding is restored.
Further, the method for searching the single-phase earth fault earth of the low-current earthing system further comprises the following steps:
8. if all outgoing lines of the substation bus are subjected to grounding search by the single-phase grounding intelligent studying and judging program, and single-phase grounding still exists, the fault of the bus is judged;
9. and when the single-phase grounding intelligent studying and judging program detects a single-phase grounding resetting signal, the program automatically exits from running.
Further, the single-phase grounding characteristic quantity detection specifically includes: and (4) patrolling the main network regulation and control system according to the sampling step length of 2 seconds, and continuously detecting the single-phase earth fault signal of the low-current earth system.
Further, the detection mode of the single-phase ground fault signal includes the following steps:
if it is
The action of a 10kV/35kV bus grounding alarm signal appears at any moment, and the signal is recorded as
；
If it is
The action of '10 kV/35kV line grounding alarm signal' appears at any moment, and the signal is recorded as
；
If it is
The amplitude of one phase voltage of the bus voltage is less than or equal to 0.7 time of the phase voltage, the other two phase voltages are greater than or equal to 1.2 times of the phase voltage, and the signal is recorded as
；
When one or more than one of the conditions occurs in the main network regulation and control system, the main network regulation and control system records the bus or the distribution line with the single-phase grounding fault, and the single-phase grounding characteristic quantity is completed
And recording the first appearance time of the single-phase grounding characteristic quantity
：
Further, the judging whether the single phase is grounded specifically includes:
if the action of a 10kV/35kV bus grounding alarm signal occurs and the signal continuous existence time is longer than 4 minutes, determining that the bus has a single-phase grounding fault;
if the action of a 10kV/35kV line grounding alarm signal occurs and the signal continuous existence time is longer than 4 minutes, determining that the line has a single-phase grounding fault;
if the amplitude of one phase voltage of the bus voltage is less than or equal to 0.7 time of the phase voltage, the other two phases of voltage are greater than or equal to 1.2 times of the phase voltage, and the voltage characteristic representation continuous existence time is greater than 4 minutes, the bus is judged to have the single-phase ground fault;
when one or more than one of the above conditions occurs in the main network regulation and control system, the main network regulation and control system records the bus or the distribution line where the single-phase earth fault occurs, and the judgment of the single-phase earth fault is completed.
Further, the acquiring of the data of the distribution network regulation and control system specifically includes:
patrolling the distribution network regulation and control system according to the sampling step length of 2 seconds, and detecting the first appearance moment of the single-phase grounding characteristic quantity
Related alarm signals within 240 seconds before and after;
if 'short-circuit warning action of the distribution network switch' occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the 'distribution network switch overcurrent alarm action' occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the zero sequence overcurrent alarm action of the distribution network switch occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the overload alarm action of the distribution network switch occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
。
Further, the acquiring of the data of the main network regulation and control system specifically includes: patrolling the regional main network scheduling automation system according to the sampling step length of 2 seconds, and if the line grounding alarm action occurs, setting the line pulling priority to be
。
Further, the updating the pull-way sequence table specifically includes: the capacitor pull-out priority is set to
(ii) a The open circuit priority of the no-load line is set as
(ii) a Priority of the pull sequence table
Setting is carried out; the pull sequence table supports manual adjustment through a human-machine interface (HMI).
Further, the executing of the single-phase grounding intelligent detection program specifically includes: carrying out grounding search on the fault bus according to the sequence in the pull-out sequence table, wherein the grounding search comprises the pulling-out and closing of an outlet switch on the fault bus; if the circuit is
After the outgoing line switch is pulled open, the single-phase grounding characteristic quantity disappears, and 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 search, the single-phase grounding characteristic quantity is not closed after an outgoing line switch of one line is pulled open, and if the line is pulled open
When the single-phase grounding characteristic quantity disappears after the outgoing switch is closed, the outgoing switch of the circuit which is opened before the outgoing switch is closed is tried in a reverse order, and the circuit is tried to be closed
When the single-phase grounding characteristic quantity appears again after the outgoing switch, the circuit is pulled open
The outgoing switch is used for simultaneously stopping executing the single-phase grounding intelligent detection program; and if the single-phase earth fault still occurs after the outlet switches of all the lines of the fault bus are pulled open, the bus is considered to have the single-phase earth fault.
Further, the determining whether the single-phase grounding is reset specifically includes: patrolling remote signaling signals in the main network regulation and control system according to the sampling step length of 2 seconds, and judging that the single-phase earth fault is reset when the 10kV/35kV bus earth alarm signal is reset; and (4) recovering the single-phase earth fault and finding out the single-phase earth fault.
The invention has the beneficial effects that:
1) the method can adapt to multi-scene single-phase earth faults of the power distribution network, quickly perform earth searching on the single-phase earth faults of the power distribution network, judge lines with single-phase earth, improve the quick handling capacity of the single-phase earth faults of the power distribution network, and improve the accurate handling level of the single-phase earth faults of the power distribution network;
2) the short-time power failure time of a non-grounded line user in the process of single-phase grounded pull-way searching of the distribution network and the complexity of remote control operation in the process of pulling way searching of the grounded line are effectively reduced, the power supply reliability is improved, and the experience, the acquisition feeling and the satisfaction degree of power customers are improved;
3) the method has the advantages that the operation data of the existing power distribution network are comprehensively utilized, the single-phase earth fault of the power distribution network is timely processed, the possibility of wrong line selection results of an automatic line selection switch and a low-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 earth fault searching and processing method of the small-current grounding system provided by the invention has strong adaptability, and can be suitable for a neutral point ungrounded system and a neutral point arc suppression coil grounded system;
5) the method for searching and processing the single-phase earth fault of the low-current grounding system does not need to additionally arrange new equipment, and has good economical efficiency;
6) the method improves the existing single-phase earth fault processing technology, is beneficial to the dispatching control operation of the power distribution network, and is beneficial to analysis, command and processing of the small-current earth fault when the small-current earth fault occurs to an analyst, thereby providing a new technical scheme for the single-phase earth fault processing of the small-current earth system.
Drawings
Fig. 1 is a flow chart of single-phase earth fault ground finding of a low-current grounding system.
Fig. 2 is a distribution network regulation and control system fault signal characteristic quantity feedback diagram.
Fig. 3 is a feedback diagram of the characteristic quantity of the fault signal of the main network regulation and control system.
Fig. 4 is a primary wiring diagram of a substation in a distribution network in the embodiment.
Fig. 5 is a primary wiring diagram of an on-site distribution automation line in the embodiment.
Detailed Description
A single-phase earth fault grounding searching method of a small current grounding 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 reset in the step 7; if the single phase is grounded, continuing to carry out the step 3;
3. acquiring distribution network regulation and control system data;
4. acquiring data of a main network regulation and control system;
5. updating the pull-way sequence table;
6. executing a single-phase grounding intelligent detection program;
7. and judging whether grounding is restored or not.
The single-phase earth fault grounding searching method of the small current grounding system further comprises the following steps:
8. if all outgoing lines of the substation bus are subjected to grounding search by the single-phase grounding intelligent studying and judging program, and single-phase grounding still exists, the fault of the bus is judged;
9. and when the single-phase grounding intelligent studying and judging program detects a single-phase grounding resetting signal, the program automatically exits from running.
The single-phase grounding characteristic quantity detection specifically comprises the following steps: patrolling the main network regulation and control system according to the sampling step length of 2 seconds, and continuously detecting a single-phase earth fault signal of the distribution network system; the single-phase earth fault signal is detected in the following way:
if it is
The action of a 10kV/35kV bus grounding alarm signal appears at any moment, and the signal is recorded as
；
If it is
The action of '10 kV/35kV line grounding alarm signal' appears at any moment, and the signal is recorded as
；
If it is
The amplitude of one phase voltage of the bus voltage is less than or equal to 0.7 time of the phase voltage at any moment, and the other two phases of the bus voltageThe voltage is greater than or equal to 1.2 times of phase voltage, and the signal is recorded as
；
When one or more than one of the conditions occurs in the main network regulation and control system, the main network regulation and control system records the bus or the distribution line with the single-phase grounding fault, and the single-phase grounding characteristic quantity is completed
And recording the first appearance time of the single-phase grounding characteristic quantity
；
Whether single-phase ground connection of judgement specifically includes:
if the action of a 10kV/35kV bus grounding alarm signal occurs and the signal continuous existence time is longer than 4 minutes, determining that the bus has a single-phase grounding fault;
if the action of a 10kV/35kV line grounding alarm signal occurs and the signal continuous existence time is longer than 4 minutes, determining that the line has a single-phase grounding fault;
if the amplitude of one phase voltage of the bus voltage is less than or equal to 0.7 time of the phase voltage, the other two phases of voltage are greater than or equal to 1.2 times of the phase voltage, and the voltage characteristic representation continuous existence time is greater than 4 minutes, the bus is judged to have the single-phase ground fault;
when one or more than one of the above conditions occurs in the main network regulation and control system, the main network regulation and control system records the bus or the distribution line where the single-phase earth fault occurs, and the judgment of the single-phase earth fault is completed.
The above-mentionedAcquiring data of a distribution network regulation and control system, specifically comprising: patrolling the distribution network regulation and control system according to the sampling step length of 2 seconds, and detecting the first appearance moment of the single-phase grounding characteristic quantity
Related alarm signals within 240 seconds before and after;
if 'short-circuit warning action of the distribution network switch' occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the 'distribution network switch overcurrent alarm action' occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the zero sequence overcurrent alarm action of the distribution network switch occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the overload alarm action of the distribution network switch occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
。
Recording distribution network switch overcurrent alarm, distribution network switch zero sequence overcurrent alarm, distribution network switch overload alarm and distribution network switch short circuit alarm signals in the distribution network regulation and control system, and tracing the distribution network line to which the switch signal belongs according to the signal attribute.
The acquiring of the data of the main network regulation and control system specifically comprises the following steps: patrolling the regional main network scheduling automation system according to the sampling step length of 2 seconds, and if the line grounding alarm occurs, setting the line pulling priority to be set to be
(ii) a The method comprises the steps that a single-phase grounding line selection device is arranged in a transformer substation, and a single-phase grounding line selection signal of the transformer substation is connected to a master station of a dispatching automation system to participate in intelligent generation of a pull-out sequence table; and the main network regulation and control 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 updating of the pull-path sequence table specifically includes: the capacitor pull-out priority is set to
(ii) a The open circuit priority of the no-load line is set as
。
The priority of the pull sequence table is according to
Setting is carried out; the pull sequence table supports manual adjustment through a human-machine interface (HMI).
The executing of the single-phase grounding intelligent detection program specifically comprises: carrying out grounding search on the fault bus according to the sequence in the single-phase grounding pull-out sequence table, wherein the grounding search comprises the pulling-out and closing of an outlet switch on the fault bus; if the circuit is
After the outgoing line switch is pulled open, the single-phase grounding characteristic quantity disappears, and 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 search, the single-phase grounding characteristic quantity is not closed after an outgoing line switch of one line is pulled open, and if the line is pulled open
When the single-phase grounding characteristic quantity disappears after the outgoing switch is closed, the outgoing switch of the circuit which is opened before the outgoing switch is closed is tried in a reverse order, and the circuit is tried to be closed
When the single-phase grounding characteristic quantity appears again after the outgoing switch, the circuit is pulled open
The outgoing switch is used for simultaneously stopping executing the single-phase grounding intelligent detection program; and if the single-phase earth fault still occurs after the outlet switches of all the lines of the fault bus are pulled open, the bus is considered to have the single-phase earth fault.
The judging whether the single-phase grounding is reset specifically comprises the following steps: and (4) patrolling remote signaling signals in the main network regulation and control system according to the sampling step length of 2 seconds, and judging that the single-phase earth fault is recovered when the 10kV/35kV bus earth alarm signal is recovered. And (4) recovering the single-phase earth fault and finding out the single-phase earth fault.
Example 1
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail with reference to the following embodiments; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a method for searching single-phase earth fault of a low-current earthing system; in FIG. 4 the 10kV busbar of the substation is brought to metallic A phase grounding, i.e.
、
、
And the three-phase voltage of the 10kV bus of the transformer substation is obviously changed.
And patrolling the distribution network regulation and control system according to the sampling step length of 2 seconds, and having no feedback signal as shown in figure 2.
Patrolling the main network regulation and control system according to the sampling step length of 2 seconds, and continuously detecting a single-phase earth fault signal of the distribution network system as shown in figure 3; detect the three-phase voltage of the bus in the main network regulation and control system
、
、
And if the action of the 10kV/35kV bus grounding alarm signal occurs, the bus is judged to have the single-phase grounding fault.
Updating the pull-way sequence table specifically comprises the following steps: the capacitor pull-out priority is set to
(ii) a The open circuit priority of the no-load line is set as
(ii) a Priority of the pull sequence table
Setting is carried out; the pull sequence table supports manual adjustment through a human-machine interaction interface (HMI); in this embodiment 1, the principle of setting the pull sequence table is as follows: 1) a capacitor connected to the bus; 3) no-load and light-load lines; 4) overhead line and overhead cable hybrid line; 5) a cable circuit; 6) and (4) other lines.
Executing a single-phase grounding intelligent detection program, as shown in fig. 4, performing grounding search on a fault bus according to a sequence existing in a single-phase grounding pull-out sequence table, wherein the grounding search includes the pulling-out and closing of an outlet switch in the fault bus; if the single-phase grounding characteristic quantity disappears after the line 110 outgoing switch is pulled open, the single-phase grounding intelligent detection program is stopped; judging the line with the single-phase earth fault as a 110 line; if the single-phase grounding characteristic quantity still exists after all outlet switches of the fault bus are grounded and searched, the outlet switches of one line are not closed any more after the outlet switches of the line 112 are pulled, if the single-phase grounding characteristic quantity disappears after the outlet switches of the line are pulled, the outlet switches of the line which are pulled before are closed in a reverse sequence test mode, the single-phase grounding characteristic quantity appears again after the outlet switches of the line 120 are tried, the outlet switches of the line 120 are pulled, meanwhile, the single-phase grounding intelligent detection program is stopped to be executed, and the lines with the single-phase grounding faults are judged to be 112 lines and 120 lines.
Example 2
As shown in fig. 1, a single-phase earth fault ground finding method for a low-current grounding system. In FIG. 4 the 10kV busbar of the substation is brought to metallic A phase grounding, i.e.
、
、
And the three-phase voltage of the 10kV bus of the transformer substation is obviously changed.
Patrolling the distribution network regulation and control system according to the sampling step length of 2 seconds, as shown in figure 2; if an "11201 distribution network switch overcurrent alarm action", "11201 distribution network switch zero sequence overcurrent alarm action", "11201 distribution network switch overload alarm action", and "11201 distribution network switch short circuit alarm action" are shown in fig. 5, the 112 line pull priority is set to be the highest.
Patrolling the main network regulation and control system according to the sampling step length of 2 seconds, and continuously detecting a single-phase earth fault signal of the distribution network system as shown in figure 3; detect the three-phase voltage of the bus in the main network regulation and control system
、
、
And if the action of the 10kV/35kV bus grounding alarm signal occurs, the bus is judged to have the single-phase grounding fault.
When the 10kV/35kV 110 line grounding alarm signal action occurs in the main network regulation and control system, the single-phase grounding intelligent studying and judging program judges that the 110 line has an A-phase grounding fault, and meanwhile, the A-phase grounding fault is updated to a single-phase grounding pull-out sequence table and the priority level is set to be next highest.
And confirming and updating the single-phase ground pull sequence table through a human-computer interaction interface HMI. The pull-sequence 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 search on a fault bus according to a sequence existing in a single-phase grounding pull-out sequence table, wherein the grounding search includes the pulling-out and closing of an outlet switch in the fault bus; and if the single-phase grounding characteristic quantity disappears after the outgoing line switch of the line 112 is pulled, terminating the single-phase grounding intelligent detection program. Judging the line with the single-phase earth fault as 112 lines; if the single-phase grounding characteristic quantity still exists after all outlet switches of the fault bus perform grounding search, the outlet switches of one line are not closed any more after the outlet switches of the line are pulled, if the single-phase grounding characteristic quantity disappears after the outlet switches of the line 110 are pulled, the outlet switches of the line which are pulled before are closed in a reverse sequence test, the single-phase grounding characteristic quantity appears again after the outlet switches of the line 120 are tried, the outlet switches of the line 120 are pulled, meanwhile, the single-phase grounding intelligent detection program is stopped to execute, and the lines with the single-phase grounding fault are judged to be the line 110 and the line 120.
After determining the single-phase grounding pull-out sequence table, executing grounding search by a single-phase grounding intelligent study and judgment program, and finally locking 112 lines to generate A-phase grounding; the short-time power failure time of the non-grounding line in the process of pulling and searching the grounding can be controlled within 10 seconds, and the single-phase grounding fault searching is rapidly realized.
Claims (10)
1. A single-phase earth fault grounding searching method of a small current grounding system is characterized by comprising 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 is reset in the step 7; if single-phase grounding occurs, continuing to perform the step 3;
3. acquiring distribution network regulation and control system data;
4. acquiring data of a main network regulation and control system;
5. updating the pull-way sequence table;
6. executing a single-phase grounding intelligent detection program;
7. and judging whether the single-phase grounding is restored.
2. The method as claimed in claim 1, further comprising the steps of:
8. if all outgoing lines of the substation bus are subjected to grounding search by the single-phase grounding intelligent studying and judging program, and single-phase grounding still exists, the fault of the bus is judged;
9. and when the single-phase grounding intelligent studying and judging program detects a single-phase grounding resetting signal, the program automatically exits from running.
3. The method for searching for the single-phase earth fault and the ground of the small-current grounding system according to claim 1 or 2, wherein the detection of the single-phase earth characteristic quantity specifically comprises: and (4) patrolling the main network regulation and control system according to the sampling step length of 2 seconds, and continuously detecting the single-phase earth fault signal of the low-current earth system.
4. The method as claimed in claim 3, wherein the detection of the single-phase earth fault signal comprises the following steps:
if it is
The action of a 10kV/35kV bus grounding alarm signal appears at any moment, and the signal is recorded as
；
If it is
The action of '10 kV/35kV line grounding alarm signal' appears at any moment, and the signal is recorded as
；
If it is
The amplitude of one phase voltage of the bus voltage is less than or equal to 0.7 time of the phase voltage, the other two phase voltages are greater than or equal to 1.2 times of the phase voltage, and the signal is recorded as
；
When one or more than one of the conditions occurs in the main network regulation and control system, the main network regulation and control system records the bus or the distribution line with the single-phase grounding fault, and the single-phase grounding characteristic quantity is completed
And recording the first appearance time of the single-phase grounding characteristic quantity
：
5. The method according to claim 1 or 2, wherein the determining whether the single phase is grounded comprises:
if the action of a 10kV/35kV bus grounding alarm signal occurs and the signal continuous existence time is longer than 4 minutes, determining that the bus has a single-phase grounding fault;
if the action of a 10kV/35kV line grounding alarm signal occurs and the signal continuous existence time is longer than 4 minutes, determining that the line has a single-phase grounding fault;
if the amplitude of one phase voltage of the bus voltage is less than or equal to 0.7 time of the phase voltage, the other two phases of voltage are greater than or equal to 1.2 times of the phase voltage, and the voltage characteristic representation continuous existence time is greater than 4 minutes, the bus is judged to have the single-phase ground fault;
when one or more than one of the above conditions occurs in the main network regulation and control system, the main network regulation and control system records the bus or the distribution line where the single-phase earth fault occurs, and the judgment of the single-phase earth fault is completed.
6. The method for searching the single-phase earth fault and the ground of the low-current grounding system according to claim 1 or 2, wherein the obtaining of the data of the distribution network regulation and control system specifically comprises:
patrolling the distribution network regulation and control system according to the sampling step length of 2 seconds, and detecting the first appearance moment of the single-phase grounding characteristic quantity
Related alarm signals within 240 seconds before and after;
if 'short-circuit warning action of the distribution network switch' occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the 'distribution network switch overcurrent alarm action' occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the zero sequence overcurrent alarm action of the distribution network switch occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
；
If the overload alarm action of the distribution network switch occurs, the pulling priority of the line to which the distribution network switch belongs is set to be
。
7. The method as claimed in claim 6, wherein the obtaining of the main network regulation and control system data specifically includes: patrolling the regional main network scheduling automation system according to the sampling step length of 2 seconds, and if the line grounding alarm action occurs, setting the line pulling priority to be
。
8. The method as claimed in claim 7, wherein the updating the pull-out sequence table further comprises: the capacitor pull-out priority is set to
(ii) a The open circuit priority of the no-load line is set as
(ii) a Priority of the pull sequence table
Setting is carried out; the pull sequence table supports manual adjustment through a human-computer interaction interface.
9. The method according to claim 1 or 2, wherein the performing of the single-phase grounding intelligent detection program specifically comprises: according to the pulling orderThe sequence existing in the table carries out grounding search on the fault bus, and the grounding search comprises the opening and closing of an outlet switch on the fault bus; if the circuit is
After the outgoing line switch is pulled open, the single-phase grounding characteristic quantity disappears, and 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 search, the single-phase grounding characteristic quantity is not closed after an outgoing line switch of one line is pulled open, and if the line is pulled open
When the single-phase grounding characteristic quantity disappears after the outgoing switch is closed, the outgoing switch of the circuit which is opened before the outgoing switch is closed is tried in a reverse order, and the circuit is tried to be closed
When the single-phase grounding characteristic quantity appears again after the outgoing switch, the circuit is pulled open
The outgoing switch is used for simultaneously stopping executing the single-phase grounding intelligent detection program; and if the single-phase earth fault still occurs after the outlet switches of all the lines of the fault bus are pulled open, the bus is considered to have the single-phase earth fault.
10. The method according to claim 1 or 2, wherein the determining whether the single-phase ground is restored includes: patrolling remote signaling signals in the main network regulation and control system according to the sampling step length of 2 seconds, and judging that the single-phase earth fault is reset when the 10kV/35kV bus earth alarm signal is reset; and (4) recovering the single-phase earth fault and finding out the single-phase earth fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111251927.9A CN113884817B (en) | 2021-10-27 | 2021-10-27 | Single-phase grounding fault grounding searching method for small-current grounding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111251927.9A CN113884817B (en) | 2021-10-27 | 2021-10-27 | Single-phase grounding fault grounding searching method for small-current grounding system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113884817A true CN113884817A (en) | 2022-01-04 |
| CN113884817B CN113884817B (en) | 2023-09-01 |
Family
ID=79013671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111251927.9A Active CN113884817B (en) | 2021-10-27 | 2021-10-27 | Single-phase grounding fault grounding searching method for small-current grounding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113884817B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017974A (en) * | 2007-03-06 | 2007-08-15 | 耿玉泉 | Single phase grounding failure positioning method and device of neutral point non direct grounding power grid |
| CN102611080A (en) * | 2012-03-16 | 2012-07-25 | 国电南瑞科技股份有限公司 | Main station type small current grounding control method |
| CN102788933A (en) * | 2012-09-25 | 2012-11-21 | 河北省电力公司 | Method for utilizing automatic switch-out controller to search power grid low-current single-phase ground fault |
| WO2015035913A1 (en) * | 2013-09-16 | 2015-03-19 | 国家电网公司 | Single-phase grounding fault handling apparatus and method for power distribution network with non-effectively grounding neutral point |
| CN105629128A (en) * | 2016-01-15 | 2016-06-01 | 国网河北省电力公司电力科学研究院 | Device and searching method for searching power grid undercurrent single-phase earth fault |
| CN106501676A (en) * | 2016-11-02 | 2017-03-15 | 国网福建省电力有限公司 | A kind of method based on electrical power distribution automatization system lost territory failure line selection |
| CN106940411A (en) * | 2017-04-21 | 2017-07-11 | 国网江苏省电力公司宿迁供电公司 | A kind of single-phase ground fault line selecting method of small-electric current grounding system |
| CN108919043A (en) * | 2018-04-03 | 2018-11-30 | 国网山东省电力公司威海供电公司 | Power distribution network small current earthing wire-selecting method based on Multi-source Information Fusion |
| CN109001590A (en) * | 2018-05-04 | 2018-12-14 | 国网安徽省电力有限公司芜湖供电公司 | A kind of grounding system single-phase grounding selecting method |
| CN109245069A (en) * | 2018-10-18 | 2019-01-18 | 南京我的电气科技有限公司 | Road control device is drawn in a kind of power distribution network small current neutral grounding based on machine learning automatically |
| CN110426593A (en) * | 2019-08-22 | 2019-11-08 | 苏州银蕨电力科技有限公司 | A kind of method for locating single-phase ground fault based on residual voltage starting |
| CN110927518A (en) * | 2019-11-15 | 2020-03-27 | 国网江苏省电力有限公司常州供电分公司 | Single-phase earth fault route-pulling and route-selecting method for small current grounding system |
| CN111585340A (en) * | 2019-02-15 | 2020-08-25 | 南京南瑞继保电气有限公司 | Main power distribution network single-phase grounding pull-out auxiliary decision-making method based on multi-source data |
-
2021
- 2021-10-27 CN CN202111251927.9A patent/CN113884817B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101017974A (en) * | 2007-03-06 | 2007-08-15 | 耿玉泉 | Single phase grounding failure positioning method and device of neutral point non direct grounding power grid |
| CN102611080A (en) * | 2012-03-16 | 2012-07-25 | 国电南瑞科技股份有限公司 | Main station type small current grounding control method |
| CN102788933A (en) * | 2012-09-25 | 2012-11-21 | 河北省电力公司 | Method for utilizing automatic switch-out controller to search power grid low-current single-phase ground fault |
| WO2015035913A1 (en) * | 2013-09-16 | 2015-03-19 | 国家电网公司 | Single-phase grounding fault handling apparatus and method for power distribution network with non-effectively grounding neutral point |
| CN105629128A (en) * | 2016-01-15 | 2016-06-01 | 国网河北省电力公司电力科学研究院 | Device and searching method for searching power grid undercurrent single-phase earth fault |
| CN106501676A (en) * | 2016-11-02 | 2017-03-15 | 国网福建省电力有限公司 | A kind of method based on electrical power distribution automatization system lost territory failure line selection |
| CN106940411A (en) * | 2017-04-21 | 2017-07-11 | 国网江苏省电力公司宿迁供电公司 | A kind of single-phase ground fault line selecting method of small-electric current grounding system |
| CN108919043A (en) * | 2018-04-03 | 2018-11-30 | 国网山东省电力公司威海供电公司 | Power distribution network small current earthing wire-selecting method based on Multi-source Information Fusion |
| CN109001590A (en) * | 2018-05-04 | 2018-12-14 | 国网安徽省电力有限公司芜湖供电公司 | A kind of grounding system single-phase grounding selecting method |
| CN109245069A (en) * | 2018-10-18 | 2019-01-18 | 南京我的电气科技有限公司 | Road control device is drawn in a kind of power distribution network small current neutral grounding based on machine learning automatically |
| CN111585340A (en) * | 2019-02-15 | 2020-08-25 | 南京南瑞继保电气有限公司 | Main power distribution network single-phase grounding pull-out auxiliary decision-making method based on multi-source data |
| CN110426593A (en) * | 2019-08-22 | 2019-11-08 | 苏州银蕨电力科技有限公司 | A kind of method for locating single-phase ground fault based on residual voltage starting |
| CN110927518A (en) * | 2019-11-15 | 2020-03-27 | 国网江苏省电力有限公司常州供电分公司 | Single-phase earth fault route-pulling and route-selecting method for small current grounding system |
Non-Patent Citations (1)
| Title |
|---|
| 毕会静 等: "小电流接地***单相接地故障分析处理", 中国电力教育, no. 24, pages 123 - 124 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113884817B (en) | 2023-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106199341B (en) | Fault line identification method and device under single-phase fault grounding working condition | |
| Zhalefar et al. | A high-speed adaptive single-phase reclosing technique based on local voltage phasors | |
| CN106950459B (en) | Distributed single-phase earth fault judgment method | |
| CN111404137B (en) | Distribution network flexible ground protection control system | |
| CN103760465A (en) | Single-phase earth fault direction judgment and processing method of small current grounding system | |
| CN201408236Y (en) | Power distribution network failure locating device | |
| CN203688722U (en) | Single-phase grounding fault processing device for small-current grounding system | |
| CN106327356B (en) | A kind of distribution network failure precise positioning method based on data mining | |
| CN110912093A (en) | Disconnection relay protection method for measuring matching of load side bus line voltage and spare power automatic switching | |
| CN112688424A (en) | Control system of intelligent high-voltage circuit breaker anti-tripping loop | |
| CN104898018A (en) | Automatic pull trial detection and control device for single-phase earth fault of power distribution network | |
| CN206096341U (en) | Be applied to fault line recognition device under distribution network single -phase fault ground connection operating mode | |
| CN106569096B (en) | Online positioning method for single-phase fault of power distribution network | |
| CN105932658A (en) | Arc-extinction apparatus for power distribution network and arc-extinction method for power distribution network by arc-extinction apparatus | |
| CN204012701U (en) | A kind of one-phase earthing failure in electric distribution network identification controller | |
| CN111381127A (en) | Method and device for single-phase earth fault and insulation monitoring of mine power supply system | |
| CN107230970A (en) | A kind of singlephase earth fault processing method of the feeder automation of type on the spot | |
| CN113884817B (en) | Single-phase grounding fault grounding searching method for small-current grounding system | |
| CN113595250B (en) | Automatic analysis method and system for abnormal opening and closing positions of GIS busbar disconnecting link | |
| CN111711180B (en) | Method and system for preventing zero sequence overcurrent protection misoperation of ultrahigh voltage spare power automatic switching induction line | |
| CN113777531B (en) | Substation operation loop monitoring and fault analysis method | |
| CN112710931B (en) | Method and system for detecting earth leakage current of secondary side long-distance cable pair of alternating current system | |
| CN111585340B (en) | Main power distribution network single-phase grounding pull-out auxiliary decision-making method based on multi-source data | |
| CN212323701U (en) | Novel differential line selection comprehensive grounding protection device | |
| CN114791545A (en) | Cable ground fault searching method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |