CN112363025A - Power distribution network single-phase earth fault diagnosis method and system - Google Patents
Power distribution network single-phase earth fault diagnosis method and system Download PDFInfo
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- CN112363025A CN112363025A CN202011467222.6A CN202011467222A CN112363025A CN 112363025 A CN112363025 A CN 112363025A CN 202011467222 A CN202011467222 A CN 202011467222A CN 112363025 A CN112363025 A CN 112363025A
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
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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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The invention discloses a method and a system for diagnosing single-phase earth faults of a power distribution network, wherein the method comprises the following steps: s1: acquiring DSCADA warning information; s2: checking by using the signal identification and the equipment running state, identifying the switch deflection, the protection signal and the telemetering out-of-limit as input, and starting single-phase earth fault diagnosis; s3: performing single-phase earth fault diagnosis based on the power distribution network model, the real-time measurement and the trigger signal; s4: the output comprises diagnosis results of a single-phase grounding section and a fault report in several different display forms. The method and the device can quickly and accurately diagnose the information of the ground fault and improve the fault removal efficiency, thereby improving the reliability of the distribution network.
Description
Technical Field
The invention relates to the technical field of power system automation, in particular to a method and a system for diagnosing a single-phase earth fault of a power distribution network.
Background
Currently, most power distribution networks in China are small grounding current systems. When single-phase earth fault occurs, the distribution network is allowed to operate for 2 hours in a live mode, and therefore power supply reliability is guaranteed. However, a series of adverse effects can be caused by the single-phase earth fault, and the whole distribution network system is greatly damaged. After the single-phase earth fault occurs, the voltage of the related power distribution equipment can rise and exceed the rated voltage, so that the normal operation of the related power distribution equipment is threatened, the fault of the related power distribution equipment is caused, and the continuous and stable power utilization of a user is further threatened.
Therefore, when the ground fault occurs, it is very important to timely and accurately locate the ground fault section, analyze and search the fault reason, and then perform targeted processing. In order to judge the earth fault of the power distribution network, the transformer substation is provided with a low-current earth line selection device. However, the low-current ground line selection device can only determine the ground line, and cannot determine the section of the ground line.
Disclosure of Invention
The invention provides a single-phase earth fault diagnosis method and system for a power distribution network, aiming at solving the problem that the prior art cannot timely and accurately locate an earth fault section, and the method and system can be used for quickly and accurately diagnosing information of earth faults and improving the fault removal efficiency, so that the reliability of the power distribution network is improved.
In order to achieve the purpose of the invention, the technical scheme is as follows: a single-phase earth fault diagnosis method for a power distribution network comprises the following steps:
s1: acquiring DSCADA warning information;
s2: checking by using the signal identification and the equipment running state, identifying the switch deflection, the protection signal and the telemetering out-of-limit as input, and starting single-phase earth fault diagnosis;
s3: performing single-phase earth fault diagnosis based on the power distribution network model, the real-time measurement and the trigger signal;
s4: the output comprises diagnosis results of a single-phase grounding section and a fault report in several different display forms.
Preferably, the signal identification comprises a feeder switch, a zero sequence protection, a grounding alarm and a zero sequence current.
Further, the running state of the equipment comprises running, debugging and overhauling.
Furthermore, checking by using the signal identifier and the equipment running state as trigger signals; the trigger signal check comprises two steps: firstly, judging that the equipment is in an operating state, then judging that the equipment is in an identification signal, and finally identifying three types of trigger signals of switch deflection, a protection signal and telemetering out-of-limit.
Still further, in step S3, the single-phase ground fault is diagnosed according to whether the switch trip signal exists or not, namely whether the switch trip signal exists or not and whether the switch trip signal exists or not.
Still further, in step S3, if the diagnosis fails, the processing is performed by fuzzy analysis.
Still further, the display form of the diagnosis result further comprises an auxiliary analysis interface, and the auxiliary analysis interface is provided with a retrieval option and a schedule for assisting in quickly judging the single-phase earth fault.
The invention also provides a system for diagnosing the single-phase earth fault of the power distribution network, which comprises an alarm information receiving module, a trigger signal checking module, a single-phase earth fault diagnosing module and a diagnostic result output module;
the warning information receiving module is used for acquiring DSCADA warning information;
the trigger signal checking module is used for checking by using the signal identifier and the equipment running state, recognizing switch deflection, a protection signal and telemetering out-of-limit as input, and starting single-phase earth fault diagnosis;
the single-phase earth fault diagnosis module is used for carrying out single-phase earth fault diagnosis based on a power distribution network model, real-time measurement and a trigger signal;
the diagnosis result output module is used for outputting diagnosis results comprising a single-phase grounding section and a fault report in different display forms.
Preferably, the trigger signal checking module comprises a judging module and an identifying module;
the judging module is used for judging that the equipment is in the running state firstly and then judging that the equipment is in the identification signal;
the identification module is used for identifying three types of trigger signals, namely switch deflection, protection signals and telemetering out-of-limit.
Furthermore, the single-phase earth fault diagnosis module comprises a non-switch trip diagnosis module, a switch trip diagnosis module and a fuzzy analysis module;
the switchless trip diagnosis module is used for diagnosing a switchless trip signal;
the diagnosis module for tripping with switch is used for diagnosing the tripping signal with switch;
and if the switch-free tripping diagnosis module and the switch-on tripping diagnosis module diagnose and identify, the fuzzy analysis module carries out fuzzy analysis processing.
The invention has the following beneficial effects:
the method is based on the distribution network automatic master station DSCADA, makes full use of switch deflection, protection signals and telemetering out-of-limit of the distribution network terminal, provides fast and accurate ground fault diagnosis information for distribution network scheduling and operation and maintenance personnel, and improves fault removal efficiency, thereby improving the reliability of the distribution network.
Drawings
FIG. 1 is a flow chart of the steps of the method described in example 1.
Fig. 2 is a block diagram of the system described in embodiment 2.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1, a method for diagnosing a single-phase earth fault of a power distribution network includes the following steps:
s1: acquiring DSCADA warning information;
s2: checking by using the signal identification and the equipment running state, identifying the switch deflection, the protection signal and the telemetering out-of-limit as input, and starting single-phase earth fault diagnosis;
s3: performing single-phase earth fault diagnosis based on the power distribution network model, the real-time measurement and the trigger signal;
s4: the output comprises diagnosis results of a single-phase grounding section and a fault report in several different display forms.
In a specific embodiment, the signal identifiers include feeder switches, zero sequence protection, ground alarms and zero sequence currents.
In a specific embodiment, the operation state of the equipment comprises operation, debugging and maintenance.
In a specific embodiment, the signal identification and the equipment running state are used as trigger signals for checking; the trigger signal check comprises two steps: firstly, judging that the equipment is in an operating state, then judging that the equipment is in an identification signal, and finally identifying three types of trigger signals of switch deflection, a protection signal and telemetering out-of-limit.
In a specific embodiment, step S3 is to perform single-phase ground fault diagnosis according to whether the switch trip signal is present or not and whether the switch trip signal is present or not.
In one embodiment, step S3, if the diagnosis fails, the process is performed using fuzzy analysis.
In a specific embodiment, the display form of the diagnosis result further includes an auxiliary analysis interface, and the auxiliary analysis interface is provided with a retrieval option and a schedule for assisting in quickly determining the single-phase ground fault.
The switchless trip diagnosis described in this embodiment specifically includes the following:
1) head end equipment
The method meets the triggering condition, and the zero sequence current type of the equipment with the maximum telemetering in the retrieval range has no automatic equipment at the front section.
The inference alarm event format is as follows:
[ power supply station ] $ station $ feeder container and $ equipment, the earthing is connected between
2) Terminal device
The device which meets the triggering signal and has the maximum zero sequence current type remote measurement in the retrieval range has the advantages that the front section is running equipment, and the rear section is not provided with automatic equipment.
The inference alarm event format is as follows:
$ station $ feeder container $ equipment, $ supply station $ rear segment ground.
3) Intermediate device
The device which meets the triggering signal and has the maximum zero sequence current type remote measurement in the retrieval range has the operation devices at the front section and the automation devices at the rear section. And (4) meeting the triggering condition, and retrieving the closing equipment closest to the 10kV outgoing line in the range.
The inference alarm event format is as follows:
$ station $ feeder container $ equipment, $ post-stage failure.
The inference alarm event format is as follows:
$ station $ feeder container $ device and $ (latter) device, ground between $ power supply station.
The present embodiment has the following specific switch trip diagnostics:
and the closed equipment closest to the 10kV outgoing line in the range is searched when the trigger signal is met.
The inference alarm event format is as follows:
$ station $ feeder container $ equipment, $ post-stage failure.
The fuzzy analysis described in this example is as follows:
and searching the equipment with the maximum telemetry in the zero sequence current type in the range.
The inference alarm event format is as follows:
[ power supply station ] $ station $ feeder container $ equipment, zero sequence current is the biggest.
The present embodiment outputs the diagnosis results as follows:
the fault report includes the following:
(1) reasoning basis: COS transactions, related telemetry.
(2) Related telemetry
And (3) the equipment does not trip, the maximum value is telemetered by descending display and the zero sequence current type of each equipment in a time range.
Equipment tripping condition, three-phase current and zero-sequence current before equipment tripping.
(3) Processing recommendations
And recording the priority of the remote control strategy table of the dispatcher according to the system, prompting the removal strategy of the corresponding fault line, and helping the dispatcher to rapidly remove the fault.
The auxiliary analysis interface described in this example:
1. retrieval options
The method is characterized in that a retrieval option is named as 'grounding analysis', and when the following 4 types of items exist in the item column of the equipment running on the 'real-time alarm' interface of the distribution network E8000, the option can be accessed by a right key:
(1) zero sequence current out-of-limit alarm (action or reset) comprises three types of out-of-limit of operation, emergency and accident;
(2) matters (actions or reverts), descriptions include "grounded";
(3) accident tripping;
(4) switch position (closed or open).
2. Analytical interface
After retrieval, the following information of all the out-station automatic terminals of the 10kV feeder lines to which the terminal belongs needs to be displayed:
(1) zero sequence current I0The list should include the following information:
the method comprises the steps of serial number, power supply station, feeder line, branch line and trunk line, analog quantity description acquisition, maximum value, value time, daily maximum value occurrence time, daily minimum value and daily minimum value occurrence time within 30 seconds before and after alarm.
(2) The switch position should include the following information:
serial number, power supply station, 10kV feeder line in the station, branch and trunk line names, collected digital quantity description,
maximum value in 30 seconds before and after the alarm, value taking time, whether to take the negative or not, whether to be effective or not, whether to manually place in the alarm or not, whether to move or not, and whether to prohibit the alarm.
(3) And the auxiliary manual analysis list can mark the maximum value of the zero-sequence current and assist the quick identification of scheduling.
Example 2
The embodiment also provides a system for diagnosing the single-phase earth fault of the power distribution network, as shown in fig. 2, the system comprises an alarm information receiving module, a trigger signal checking module, a single-phase earth fault diagnosing module and a diagnosis result output module;
the warning information receiving module is used for acquiring DSCADA warning information;
the trigger signal checking module is used for checking by using the signal identifier and the equipment running state, recognizing switch deflection, a protection signal and telemetering out-of-limit as input, and starting single-phase earth fault diagnosis;
the single-phase earth fault diagnosis module is used for carrying out single-phase earth fault diagnosis based on a power distribution network model, real-time measurement and a trigger signal;
the diagnosis result output module is used for outputting diagnosis results comprising a single-phase grounding section and a fault report in different display forms.
In a specific embodiment, the trigger signal checking module includes a determination module and an identification module;
the judging module is used for judging that the equipment is in the running state firstly and then judging that the equipment is in the identification signal;
the identification module is used for identifying three types of trigger signals, namely switch deflection, protection signals and telemetering out-of-limit.
In a specific embodiment, the single-phase ground fault diagnosis module comprises a switchless trip diagnosis module, a switchless trip diagnosis module and a fuzzy analysis module;
the switchless trip diagnosis module is used for diagnosing a switchless trip signal;
the diagnosis module for tripping with switch is used for diagnosing the tripping signal with switch;
and if the switch-free tripping diagnosis module and the switch-on tripping diagnosis module diagnose and identify, the fuzzy analysis module carries out fuzzy analysis processing.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A single-phase earth fault diagnosis method for a power distribution network is characterized by comprising the following steps: the method comprises the following steps:
s1: acquiring DSCADA warning information;
s2: checking by using the signal identification and the equipment running state, identifying the switch deflection, the protection signal and the telemetering out-of-limit as input, and starting single-phase earth fault diagnosis;
s3: performing single-phase earth fault diagnosis based on the power distribution network model, the real-time measurement and the trigger signal;
s4: the output comprises diagnosis results of a single-phase grounding section and a fault report in several different display forms.
2. The power distribution network single-phase earth fault diagnosis method according to claim 1, characterized in that: the signal identification comprises a feeder switch, zero sequence protection, grounding alarm and zero sequence current.
3. The power distribution network single-phase earth fault diagnosis method according to claim 2, characterized in that: the running state of the equipment comprises running, debugging and overhauling.
4. The power distribution network single-phase earth fault diagnosis method according to claim 3, characterized in that: checking by using the signal identifier and the equipment running state as trigger signals; the trigger signal check comprises two steps: firstly, judging that the equipment is in an operating state, then judging that the equipment is in an identification signal, and finally identifying three types of trigger signals of switch deflection, a protection signal and telemetering out-of-limit.
5. The power distribution network single-phase earth fault diagnosis method according to claim 4, characterized in that: and step S3, specifically, performing single-phase earth fault diagnosis according to the condition that the switch tripping signal exists or not and the condition that the switch tripping signal exists or not.
6. The power distribution network single-phase earth fault diagnosis method according to claim 5, characterized in that: in step S3, if the diagnosis fails, the process is performed by fuzzy analysis.
7. The power distribution network single-phase earth fault diagnosis method according to claim 1, characterized in that: the display form of the diagnosis result further comprises an auxiliary analysis interface, and the auxiliary analysis interface is provided with a retrieval option and a schedule and is used for assisting in quickly judging the single-phase earth fault.
8. The utility model provides a distribution network single-phase earth fault diagnostic system which characterized in that: the system comprises an alarm information receiving module, a trigger signal checking module, a single-phase earth fault diagnosis module and a diagnosis result output module;
the warning information receiving module is used for acquiring DSCADA warning information;
the trigger signal checking module is used for checking by using the signal identifier and the equipment running state, recognizing switch deflection, a protection signal and telemetering out-of-limit as input, and starting single-phase earth fault diagnosis;
the single-phase earth fault diagnosis module is used for carrying out single-phase earth fault diagnosis based on a power distribution network model, real-time measurement and a trigger signal;
the diagnosis result output module is used for outputting diagnosis results comprising a single-phase grounding section and a fault report in different display forms.
9. The power distribution network single-phase ground fault diagnostic system of claim 8, wherein: the trigger signal checking module comprises a judging module and an identifying module;
the judging module is used for judging that the equipment is in the running state firstly and then judging that the equipment is in the identification signal;
the identification module is used for identifying three types of trigger signals, namely switch deflection, protection signals and telemetering out-of-limit.
10. The power distribution network single-phase ground fault diagnostic system of claim 8, wherein: the single-phase earth fault diagnosis module comprises a non-switch trip diagnosis module, a switch trip diagnosis module and a fuzzy analysis module;
the switchless trip diagnosis module is used for diagnosing a switchless trip signal;
the diagnosis module for tripping with switch is used for diagnosing the tripping signal with switch;
and if the switch-free tripping diagnosis module and the switch-on tripping diagnosis module diagnose and identify, the fuzzy analysis module carries out fuzzy analysis processing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113486290A (en) * | 2021-07-05 | 2021-10-08 | 国网福建省电力有限公司泉州供电公司 | Safety check calculation method for grounding device of active low-voltage distribution network |
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Application publication date: 20210212 |