CN110445093A - A kind of adaptive earth leakage protecting method of low-voltage distribution network based on communication - Google Patents
A kind of adaptive earth leakage protecting method of low-voltage distribution network based on communication Download PDFInfo
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- CN110445093A CN110445093A CN201910497705.1A CN201910497705A CN110445093A CN 110445093 A CN110445093 A CN 110445093A CN 201910497705 A CN201910497705 A CN 201910497705A CN 110445093 A CN110445093 A CN 110445093A
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- Prior art keywords
- earth leakage
- adaptive
- leakage
- protectives
- distribution network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of adaptive earth leakage protecting methods of the low-voltage distribution network based on communication, comprising: step 1 is collected the leakage current value measured at multiple same level-one earth leakage protectives in same power distribution station in the way of wire/wireless communication, is denoted as I respectively01、I02…I0n, and calculate the average value that leakage current is measured at above-mentioned multiple earth leakage protectivesStep 2, according to the average value of leakage currentSelf-adaptive sites leakage current acts definite valueAnd by Iset0Each earth leakage protective described in step 1 is issued to by wire/wireless communication mode；Step 3, each earth leakage protective is according to the I issuedset0, it is determined whether I is worked as in movement0i≥IsetWhen establishment, i-th feeder line earth leakage protective movement；Otherwise, earth leakage protective is failure to actuate.Compared to prior art, adaptation scheme of the invention still can effectively avoid the situation of multiple earth leakage protectives malfunction simultaneously from occurring when the factors such as bad weather cause multiple earth leakage protectives at the same level to generate biggish leakage current；And at the same time the also sensitivity with higher in lesser leakage current.
Description
Technical field
The invention belongs to power supply-distribution system relay protection field, in particular to a kind of low-voltage distribution network based on communication is adaptive
Earth leakage protecting method.
Background technique
Low-voltage distribution network and load relationship are the closest, are the component parts in entire electric system closest to user, because of it
The boorish mountain ridge is passed through, local environment is severe, so that leaky is more frequent.To avoid electric leakage from leading to the person and property safety
It is seriously threatened, the person caused by most low-voltage network electric leakages can be effectively eliminated using earth leakage protective device and hurt
Evil.
Earth leakage protective device is widely used to low-voltage distribution network, to ensure distribution operational safety.But existing earth leakage protective dress
Setting may be caused same using fixed threshold setting mode when the environmental changes reason such as weather causes insulation status to change
A large amount of earth leakage protective device malfunctions, influence the normal power supply of user, bring unnecessary economic loss in platform area.
Summary of the invention
The purpose of the present invention is to provide a kind of adaptive earth leakage protecting methods of the low-voltage distribution network based on communication, are effectively reduced
Insulation performance caused by due to bad weather reduces the risk of a large amount of earth leakage protective malfunctions in the regional area caused.
To achieve the goals above, the present invention is using following plus shield scheme:
A kind of adaptive earth leakage protecting method of low-voltage distribution network based on communication, comprising the following steps:
Step 1: collecting the leakage current value measured at multiple same level-one earth leakage protectives in same power distribution station, remember respectively
For I01、I02…I0n, and calculate the average value that leakage current is measured at above-mentioned multiple earth leakage protectives
Step 2: measuring the average value of leakage current at the multiple earth leakage protectives being calculated according to step 1It is adaptive whole
Determine leakage current movement definite valueAnd by Iset0It is issued to each earth leakage protective described in step 1；Wherein KrelFor
Safety factor；
Step 3: each earth leakage protective is according to the I issuedset0Determine whether to act, works as I0i≥IsetWhen establishment, i-th feeder line
Earth leakage protective movement；Otherwise, earth leakage protective is failure to actuate.
Further, step 1 is collected multiple same in same power distribution station by wired or wireless communication mode
The leakage current value measured at grade earth leakage protective.
Further, in step 2, by wired or wireless communication mode by Iset0It is issued to described in step 1
Each earth leakage protective.
Further, safety factor KrelValue be 1.5~2.
Further, the leakage current measured at all same level-one earth leakage protectives in same power distribution station is collected in step 1
Value.
Further, in step 3, work as I0i≥IsetWhen establishment, i-th feeder line earth leakage protective movement excision power supply.
Compared with the existing technology, the invention has the following advantages:
1) existing earth leakage protective residual operating current representative value be 30mA, vulnerable to the factors such as bad weather influence generate compared with
Big leakage current will lead to a large amount of earth leakage protective in certain area while malfunction, to bring a wide range of power outages of user.
And the present invention is when the factors such as bad weather cause multiple earth leakage protectives at the same level to generate biggish leakage current, of the invention is adaptive
The situation for answering scheme that can effectively avoid the malfunction simultaneously of multiple earth leakage protectives occurs；
2) there are the risks of tripping when electric shock accidents leakage current is smaller for the earth leakage protective of existing fixed threshold, and use
Adaptation scheme of the present invention can be realized the still sensitivity with higher in lesser leakage current.
The present invention is based on the earth leakage protective communication modes of peer under same area of low-voltage distribution network, realize that a kind of synthesis is same
Method grade multiple earth leakage protective electric leakage stream informations and then form adaptive residual operating current；This method utilizes leakage at the same level
The information interaction approach of electric protection terminal and main control unit at the same level shares each terminal leakage current test information, realizes that electric leakage at the same level is protected
The residual operating current self-adaptive sites of shield, to realize that the earth leakage protective of selective movement provides good thinking.The present invention can
The risk of a large amount of earth leakage protective malfunctions in the regional area of initiations such as to be effectively reduced due to bad weather, guarantee leakage current
The Reliability of Microprocessor of protection is ensured to customer power supply safety, continuous, reduction economic loss.It there is no earth leakage protective electric leakage at present
The adaptation scheme of action current.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is a kind of work flow diagram of the adaptive earth leakage protecting method of low-voltage distribution network based on communication of the invention.
Specific embodiment
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that in the feelings not conflicted
Under condition, the features in the embodiments and the embodiments of the present application be can be combined with each other.
Following detailed description is exemplary explanation, it is intended to provide further be described in detail to the present invention.Unless another
It indicates, all technical terms of the present invention contain with the normally understood of the application one of ordinary skill in the art
Justice is identical.Term used in the present invention is merely to describe specific embodiment, and be not intended to limit according to the present invention
Illustrative embodiments.
Refering to Figure 1, the present invention provides a kind of adaptive earth leakage protecting method of the low-voltage distribution network based on communication, including
Following steps:
Step 1, while the leakage current I at the earth leakage protective of all n feeder lines at the same level in same area of distribution is acquired01、I02…
I0n, the leakage current measured at earth leakage protective at the same level is uploaded to earth leakage protective master control list at the same level in the way of wire/wireless communication
Element module, and calculate the average value of the leakage current of n item peer feeder line
Step 2, feeder line earth leakage protective main control unit self-adaptive sites leakage current at the same level acts definite valueWherein
KrelFor safety factor, 1.5~2 are taken；
Step 3, by Iset0Electric shock state is carried out by the earth leakage protective that wire/wireless communication mode sends feeder line at the same level to
With the differentiation of leakage discharge condition: working as I0i≥Iset0When establishment, i-th feeder line earth leakage protective movement；Otherwise invalid, then it leaks electricity
Protection is failure to actuate.
The adaptive earth leakage protecting method of a kind of low-voltage distribution network based on communication proposed by the present invention, first with information sharing
Mode real-time measurement and the leakage current average value for calculating same area all feeder lines at the same levelIt willAdjusting is movement
Threshold, and then more each feeder line leakage current and setting valve IsetSize carry out electric leakage judgement.This method, which is realized, to be easy, and is calculated
Simply, when the factors such as bad weather cause multiple earth leakage protectives at the same level to generate biggish leakage current, of the invention is adaptive
Scheme can effectively avoid the situation of multiple earth leakage protectives malfunction simultaneously from occurring；And in lesser leakage current still have compared with
High sensitivity.
As known by the technical knowledge, the present invention can pass through the embodiment party of other essence without departing from its spirit or essential feature
Case is realized.Therefore, embodiment disclosed above, in all respects are merely illustrative, not the only.Institute
Have within the scope of the present invention or is included in the invention in the change being equal in the scope of the present invention.
Claims (6)
1. a kind of adaptive earth leakage protecting method of low-voltage distribution network based on communication, which comprises the following steps:
Step 1: collecting the leakage current value measured at multiple same level-one earth leakage protectives in same power distribution station, it is denoted as I respectively01、
I02…I0n, and calculate the average value that leakage current is measured at above-mentioned multiple earth leakage protectives
Step 2: measuring the average value of leakage current at the multiple earth leakage protectives being calculated according to step 1Self-adaptive sites leakage
Electric current acts definite valueAnd by Iset0It is issued to each earth leakage protective device described in step 1；Wherein KrelFor
Safety factor；
Step 3: each earth leakage protective is according to the I issuedset0Determine whether to act, works as I0i≥IsetWhen establishment, i-th feeder line electric leakage
Protection act；Otherwise, earth leakage protective is failure to actuate.
2. the adaptive earth leakage protecting method of a kind of low-voltage distribution network based on communication according to claim 1, which is characterized in that
Step 1 is collected by wired or wireless communication mode and is measured at multiple same level-one earth leakage protectives in same power distribution station
Leakage current value.
3. the adaptive earth leakage protecting method of a kind of low-voltage distribution network based on communication according to claim 1, which is characterized in that
In step 2, by wired or wireless communication mode by Iset0It is issued to each earth leakage protective described in step 1.
4. the adaptive earth leakage protecting method of a kind of low-voltage distribution network based on communication according to claim 1, which is characterized in that
Safety factor KrelValue be 1.5~2.
5. the adaptive earth leakage protecting method of a kind of low-voltage distribution network based on communication according to claim 1, which is characterized in that
The leakage current value measured at all same level-one earth leakage protectives in same power distribution station is collected in step 1.
6. the adaptive earth leakage protecting method of a kind of low-voltage distribution network based on communication according to claim 1, which is characterized in that
In step 3, work as I0i≥IsetWhen establishment, i-th feeder line earth leakage protective movement excision power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910497705.1A CN110445093A (en) | 2019-06-10 | 2019-06-10 | A kind of adaptive earth leakage protecting method of low-voltage distribution network based on communication |
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| CN201910497705.1A CN110445093A (en) | 2019-06-10 | 2019-06-10 | A kind of adaptive earth leakage protecting method of low-voltage distribution network based on communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952753A (en) * | 2021-03-15 | 2021-06-11 | 国网福建省电力有限公司南平供电公司 | Low-voltage power grid electric shock accident detection method and system based on threshold value self-adaptive adjustment |
| CN113178850A (en) * | 2021-05-12 | 2021-07-27 | 国网山东省电力公司青岛供电公司 | Low-voltage distribution network multipoint differential leakage protection method based on distribution Internet of things |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030142450A1 (en) * | 2001-05-03 | 2003-07-31 | Zhiqian Bo | Protection of electrical power lines |
| CN1988304A (en) * | 2006-12-11 | 2007-06-27 | 华为技术有限公司 | Method and system for realizing detection protection in far away power supply |
| CN103618381A (en) * | 2013-11-13 | 2014-03-05 | 国家电网公司 | Protecting and measuring integrated comprehensive distribution box |
-
2019
- 2019-06-10 CN CN201910497705.1A patent/CN110445093A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030142450A1 (en) * | 2001-05-03 | 2003-07-31 | Zhiqian Bo | Protection of electrical power lines |
| CN1988304A (en) * | 2006-12-11 | 2007-06-27 | 华为技术有限公司 | Method and system for realizing detection protection in far away power supply |
| CN103618381A (en) * | 2013-11-13 | 2014-03-05 | 国家电网公司 | Protecting and measuring integrated comprehensive distribution box |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952753A (en) * | 2021-03-15 | 2021-06-11 | 国网福建省电力有限公司南平供电公司 | Low-voltage power grid electric shock accident detection method and system based on threshold value self-adaptive adjustment |
| CN112952753B (en) * | 2021-03-15 | 2024-05-10 | 国网福建省电力有限公司南平供电公司 | Threshold self-adaptive adjustment-based electric shock accident detection method and system for low-voltage power network |
| CN113178850A (en) * | 2021-05-12 | 2021-07-27 | 国网山东省电力公司青岛供电公司 | Low-voltage distribution network multipoint differential leakage protection method based on distribution Internet of things |
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Application publication date: 20191112 |