CN109061378A - Small current neutral grounding system ground fault checks method - Google Patents
Small current neutral grounding system ground fault checks method Download PDFInfo
- Publication number
- CN109061378A CN109061378A CN201810590896.1A CN201810590896A CN109061378A CN 109061378 A CN109061378 A CN 109061378A CN 201810590896 A CN201810590896 A CN 201810590896A CN 109061378 A CN109061378 A CN 109061378A
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- time
- wire
- block switch
- residual voltage
- outgoing breaker
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Classifications
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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
-
- 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
-
- 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
Abstract
The invention discloses a kind of small current neutral grounding system ground faults to check method, is related to grid automation technical field, passes through following steps: after detecting that residual voltage value is greater than the set value, according to from greatly to small one by one to corresponding wire-outgoing breaker progress trip operation；After wire-outgoing breaker tripping, after the breaker time-delay closing time, wire-outgoing breaker carries out reclosing；After wire-outgoing breaker reclosing, the automation block switch connecting with wire-outgoing breaker detects that voltage restores and carries out unilateral electric time-delay closing；After automating block switch time-delay closing, residual voltage is detected in zero sequence voltage detection delay time, if not finding that residual voltage value is greater than the set value, "on" position is then kept to connect next section of route, if detecting that residual voltage value is greater than the set value in zero sequence voltage detection delay time, it then the automation block switch automatic brake separating and is latched, that is, can determine whether that earth fault just in the section, can quickly check the place on line that is out of order.
Description
Technical field
The present invention relates to grid automation technical fields, in particular to a kind of small current neutral grounding system ground fault investigation side
Method.
Background technique
Power distribution automation is to carry out real-time monitoring, the integrated system of monitoring, by power distribution network to the various kinds of equipment in power distribution network
Detection metering, fault-finding positioning, automatically control, planning, data statistics management together as one integrated system, a kind of raising
Power distribution network operation and management level, the effective measure for shortening power off time, improving power supply reliability and service quality.
Feeder automation utilizes automation equipment or system, monitors the operation conditions of power distribution network, finds power distribution network event in time
Barrier carries out the power supply of fault location, isolation and recovery to non-faulting region.Automatic positioning and isolation to Distribution Network Failure, it has
It is standby independent of main website and communication, maintenance work amoun is small, the low advantage of investment, thus in Distribution Automation Construction and transformation
To being widely applied.
However, existing feeder automation is only applicable to the automatic processing of short trouble, can not be connect suitable for low current
Ground fault processing under ground system condition.When there is small current grounding fault, need disjunction route then to each section of route
It is manually checked, influences operation of power networks, increase staff's labour.
Summary of the invention
To solve the above problems, the present invention provides a kind of small current neutral grounding system ground fault investigation method, use as
Lower technical solution is realized:
A kind of small current neutral grounding system ground fault investigation method, comprising the following steps:
After S1, Small Electric Current Earthing And Routing Device detect that residual voltage value is greater than the set value, occurred according to the failure of every route
Probability, according to the switching time of setting from greatly to small one by one to corresponding wire-outgoing breaker progress trip operation；
After S2, wire-outgoing breaker tripping, after the breaker time-delay closing time, wire-outgoing breaker carries out reclosing；
After S3, wire-outgoing breaker reclosing, the automation block switch connecting with wire-outgoing breaker detects that voltage recovery is gone forward side by side
Row is unilateral to obtain electric time-delay closing；
After S4, automation block switch time-delay closing, residual voltage is detected in zero sequence voltage detection delay time, such as
Fruit does not find that residual voltage value is greater than the set value, then "on" position is kept to connect next section of route, if examined in residual voltage
It surveys in delay time and detects that residual voltage value is greater than the set value, then the automation block switch automatic brake separating and be latched
Judge earth fault just in the section；
S5, after step S4, if automation block switch do not trip, next section of automation block switch
Step S4 is repeated until completing the reclosing of all automation block switches and zero sequence voltage detection operation on route.
Preferably, when switching time described in step S1 is more than or equal to all automation block switch time-delay closings in route
Between, the zero sequence voltage detection delay time and the sum of wire-outgoing breaker reclosure time of afterbody automation block switch.
Preferably, the breaker time-delay closing time described in step S2 is greater than each automation block switch on same route and loses
The time of pressure tripping disjunction.
Preferably, zero sequence voltage detection delay time described in step S4 obtains electric delay for automation block switch completion is unilateral
Start timing after combined floodgate, time span is not less than 100ms.
Beneficial effect of the present invention includes: to have no need to change the wiring of existing equipment, need to only be opened in each automation segmentation
Setting zero sequence voltage detection delay time is shut, easy to operate, accuracy of judgement is high-efficient.
Detailed description of the invention
Fig. 1 is common substation's wire-outgoing breaker and automation block switch connection figure；
Fig. 2 is the connection schematic diagram checked using method provided by the invention to fault point；
Fig. 3 is the investigation timing diagram of fault point 3 in Fig. 2；
In figure, CBx indicates that substation's wire-outgoing breaker, FSxx indicate that automation block switch, LSx indicate interconnection switch；
T0 is wire-outgoing breaker reclosing delay time；
T10 is the first order automation block switch time-delay closing time, and T11 is the first automation block switch zero sequence voltage detection
Delay time；
T20 is the second level automation block switch time-delay closing time, and T21 is the second automation block switch zero sequence voltage detection
Delay time；
T30 is the third level automation block switch time-delay closing time, and T31 is third automation block switch zero sequence voltage detection
Delay time.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Fig. 1-3, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.The embodiment of the present invention being usually described and illustrated herein in the accompanying drawings
Detailed description be not intended to limit the range of claimed invention, but be merely representative of selected embodiment of the invention.
Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts all
Other embodiments shall fall within the protection scope of the present invention.
As shown in Figures 2 and 3, it is assumed that small current grounding fault has occurred in FS13 block switch leading-out terminal, is firstly provided at
Small Electric Current Earthing And Routing Device in substation detects that residual voltage value is greater than the set value, and as shown in V1 in Fig. 3, V0 indicates zero
Sequence voltage setting value, V1 indicate currently detected residual voltage value, and at this time system occurs general according to the failure of every route
Rate, according to the switching time of setting from greatly to small one by one to the wire-outgoing breaker progress trip operation of each substation outlet.
1) when carrying out trip operation to first route, what remaining route was to turn on, after wire-outgoing breaker tripping, warp
After crossing breaker time-delay closing time T0, wire-outgoing breaker carries out reclosing, as shown in T/CB1 in Fig. 3；
2) after wire-outgoing breaker reclosing, the first automation block switch FS11 connecting with wire-outgoing breaker detects that voltage is extensive
Redoubling progress is unilateral to obtain electric time-delay closing；
3) automation block switch FS11 it is unilateral after electric time-delay closing, to zero sequence in zero sequence voltage detection delay time T11
Voltage is detected, and does not find that residual voltage value is greater than the set value, then "on" position is kept to connect next section of route；
4) automation block switch FS12 it is unilateral after electric time-delay closing, to zero sequence in zero sequence voltage detection delay time T21
Voltage is detected, and does not find that residual voltage value is greater than the set value, then "on" position is kept to connect next section of route；
5) automation block switch FS13 it is unilateral after electric time-delay closing, to zero sequence in zero sequence voltage detection delay time T31
Voltage is detected, and discovery residual voltage value is greater than the set value, then FS13 automates block switch automatic brake separating and is latched
Judge earth fault just in the section.
Likewise, remaining route is when ground fault occurs for feeder line, residual voltage value that line selection device for low current will test
Greater than definite value as the criterion that ground fault occurs, at the same by itself algorithm to fault rate from being triggered one by one to small greatly
The tripping of substation's wire-outgoing breaker.After the tripping of substation's wire-outgoing breaker, by the setting time, (reclosure time is greater than on route
The decompression opening time of switch) automatic reclosing.(it is greater than outlet in any route under non-failure conditions using setting time
Breaker open operation, for block switch after decompression separating brake, wire-outgoing breaker is overlapped the moment to the last one block switch on route
Close a floodgate experience time) afterwards: if line selection device for low current detection residual voltage value be still greater than definite value, execute probability of malfunction compared with
Small route outlet switch tripping；If the residual voltage value of line selection device for low current detection is less than definite value, ground connection event can determine whether
Barrier has been isolated；If after all routes live through route selection adjustment, the residual voltage value of line selection device for low current detection is still greater than
Definite value then may determine that there is multiple spot with mutually ground connection on route.Such as Fig. 1, ground fault occurs in single generation on feeder line, such as
Earth fault 1 or 3 only occurs, this logic of class can accurately realize the isolation of single ground fault on route.
Feeder automation block switch on route step by step electric combined floodgate, when together in earth fault, feeder automation
(theoretically setting time is less than the time X that next stage block switch obtains electric combined floodgate to block switch, general to be arranged within the set time
For the judgement time Y of failure after combined floodgate) separating brake and it is latched.Feeder automation block switch executes the condition of this separating brake locking such as
Under: detect that route residual voltage is less than definite value 1(and the judgment basis of residual voltage is not detected before closing a floodgate), after combined floodgate
(the judgement time Y of failure) detects that route residual voltage is greater than definite value 2 after setting time.It does not hold in the following two cases
The locking of row separating brake: (1) feeder automation switch has detected that (judgment basis is greater than residual voltage for residual voltage before combined floodgate
Definite value)；(2) be not detected in the X time limit before closing a floodgate ground fault (judgment basis is residual voltage < setting value 1), after combined floodgate
Detect ground fault after experience fault determining time Y (judgment basis is residual voltage > setting value 2).It connects as shown in figure 1
Earth fault point 2,3, ground fault occur after first goes out line automation block switch, this logic can be used for cutting off such
Ground fault, without there is a situation where expand failure.
Substation's route selection outlet switch is before reclosing, and ground fault is not detected, and (judgment basis is that residual voltage is small
In definite value I), if the setting time (setting time that first block switch of outlet obtains electric combined floodgate) after reclosing is interior, detect
Ground fault (judgment basis be greater than for residual voltage definite value II), then separating brake and latch switch.If the setting time after reclosing
(setting time that first block switch of outlet obtains electric combined floodgate) outside, detects that (judgment basis is that residual voltage is big to ground fault
In definite value II), then it is failure to actuate.Earth fault 1 as shown in figure 1, ground fault occur wire-outgoing breaker and first outlet oneself
When between dynamicization block switch, this logic can be used for cutting off such ground fault.
According to specific illustrative examples, invention has been described herein.To one skilled in the art
It will be apparent carrying out replacement or modification appropriate without departing from the scope of the invention.Illustrative example is only example
Card property, rather than limiting the invention, the scope of the present invention is defined by the claims.
Claims (4)
1. a kind of small current neutral grounding system ground fault checks method, which comprises the following steps:
After S1, Small Electric Current Earthing And Routing Device detect that residual voltage value is greater than the set value, occurred according to the failure of every route
Probability, according to the switching time of setting from greatly to small one by one to corresponding wire-outgoing breaker progress trip operation；
After S2, wire-outgoing breaker tripping, after the breaker time-delay closing time, wire-outgoing breaker carries out reclosing；
After S3, wire-outgoing breaker reclosing, the automation block switch connecting with wire-outgoing breaker detects that voltage recovery is gone forward side by side
Row is unilateral to obtain electric time-delay closing；
After S4, automation block switch time-delay closing, residual voltage is detected in zero sequence voltage detection delay time, such as
Fruit does not find that residual voltage value is greater than the set value, then "on" position is kept to connect next section of route, if examined in residual voltage
It surveys in delay time and detects that residual voltage value is greater than the set value, then the automation block switch automatic brake separating and be latched
Judge earth fault just in the section；
S5, after step S4, if automation block switch do not trip, next section of automation block switch
Step S4 is repeated until completing the reclosing of all automation block switches and zero sequence voltage detection operation on route.
2. small current neutral grounding system ground fault according to claim 1 checks method, it is characterised in that:
Switching time described in step S1 is more than or equal to all automatic section switch reclosure times, zero sequence voltage detection in route and prolongs
When the sum of time and wire-outgoing breaker reclosure time.
3. small current neutral grounding system ground fault according to claim 1 checks method, it is characterised in that:
The breaker time-delay closing time described in step S2 is greater than each automation block switch decompression tripping disjunction on same route
Time.
4. small current neutral grounding system ground fault according to claim 3 checks method, it is characterised in that:
Zero sequence voltage detection delay time described in step S4 is that automatic section switch is completed to start timing, time span after closing a floodgate
Not less than 100ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810590896.1A CN109061378A (en) | 2018-06-09 | 2018-06-09 | Small current neutral grounding system ground fault checks method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810590896.1A CN109061378A (en) | 2018-06-09 | 2018-06-09 | Small current neutral grounding system ground fault checks method |
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| CN109061378A true CN109061378A (en) | 2018-12-21 |
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| CN201810590896.1A Pending CN109061378A (en) | 2018-06-09 | 2018-06-09 | Small current neutral grounding system ground fault checks method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613383A (en) * | 2018-12-27 | 2019-04-12 | 中国电力科学研究院有限公司 | Meter and the alternating current circuit fault judgment method and system of direct current access |
| CN110568316A (en) * | 2019-10-16 | 2019-12-13 | 国网四川省电力公司绵阳供电公司 | Method for quickly selecting line of ground fault of low-current grounding system |
| CN111781465A (en) * | 2020-06-28 | 2020-10-16 | 云南电网有限责任公司电力科学研究院 | Fault positioning system and method for ungrounded power grid |
| CN112540322A (en) * | 2020-12-29 | 2021-03-23 | 广东电网有限责任公司电力科学研究院 | Line selection method, device and equipment for single-phase earth fault line of feeder line of transformer substation |
| CN113484681A (en) * | 2021-07-14 | 2021-10-08 | 广西电网有限责任公司电力科学研究院 | On-site overlapping type feeder automation line ground fault interval detection method and device |
| CN113866563A (en) * | 2021-09-30 | 2021-12-31 | 广东电网有限责任公司东莞供电局 | Voltage current type feeder automation test system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613383A (en) * | 2018-12-27 | 2019-04-12 | 中国电力科学研究院有限公司 | Meter and the alternating current circuit fault judgment method and system of direct current access |
| CN110568316A (en) * | 2019-10-16 | 2019-12-13 | 国网四川省电力公司绵阳供电公司 | Method for quickly selecting line of ground fault of low-current grounding system |
| CN111781465A (en) * | 2020-06-28 | 2020-10-16 | 云南电网有限责任公司电力科学研究院 | Fault positioning system and method for ungrounded power grid |
| CN112540322A (en) * | 2020-12-29 | 2021-03-23 | 广东电网有限责任公司电力科学研究院 | Line selection method, device and equipment for single-phase earth fault line of feeder line of transformer substation |
| CN113484681A (en) * | 2021-07-14 | 2021-10-08 | 广西电网有限责任公司电力科学研究院 | On-site overlapping type feeder automation line ground fault interval detection method and device |
| CN113484681B (en) * | 2021-07-14 | 2022-09-23 | 广西电网有限责任公司电力科学研究院 | On-site overlapping type feeder automation line ground fault interval detection method and device |
| CN113866563A (en) * | 2021-09-30 | 2021-12-31 | 广东电网有限责任公司东莞供电局 | Voltage current type feeder automation test system |
| CN113866563B (en) * | 2021-09-30 | 2024-02-13 | 广东电网有限责任公司东莞供电局 | Voltage-current feeder automation test system |
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