CN105977906B - Method for protecting residual current and system - Google Patents
Method for protecting residual current and system Download PDFInfo
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- CN105977906B CN105977906B CN201510845027.5A CN201510845027A CN105977906B CN 105977906 B CN105977906 B CN 105977906B CN 201510845027 A CN201510845027 A CN 201510845027A CN 105977906 B CN105977906 B CN 105977906B
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- current signal
- leakage current
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- shock
- signal
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- 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
- H02H3/16—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 fault current to earth, frame or mass
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of method for protecting residual current and system, this method includes：Acquire the leakage current signal in power supply grid；Collected leakage current signal is pre-processed；The isolated organism shock current signal from pretreated leakage current signal；Judge whether the organism shock current signal isolated is more than electric current preset value, if so, executing residual current protecting trip operation.In method for protecting residual current provided by the invention and system, is judged using the organism shock current signal separated from leakage current signal, avoid and cause mistrip since leakage current is larger, improve the reliability of residual current protecting.Simultaneously using electric current preset value to whether really thering is organism electric shock to judge, and then improve the accuracy of judgement.
Description
Technical field
The present invention relates to residual current protecting technical field, especially a kind of method for protecting residual current and a kind of remaining electricity
Flow protection system.
Background technology
Residual current protecting technology can be used for preventing as the important low pressure Electrical Safety protection technique in power grid end one
The generation of the accidents such as physical electrical shock fire protection injures and deaths.
Currently, the Aftercurrent protecting equipment of on-line operation using the size of the leakage current virtual value detected as whether
Execute unique criterion of trip operation.But practical experience shows the criterion that leakage current virtual value is used to execute electrical shock protection
There is unsurmountable defects.For example, when Aftercurrent protecting equipment operates on the unbalanced power grid of three phase current leakage,
In the presence of insensitive phase (get an electric shock not protection's dead-zone) and the excessively sensitive phase (malfunction area) got an electric shock, therefore protection feature is undesirable, shadow
Ring the reliability of the operational percentage and security protection of Aftercurrent protecting equipment.In addition, the power supply grid in China, especially rural area are electric
Net, due to power grid, equipment, electric power, insulation ag(e)ing degree difference etc., even if under normal operating mode, power grid supplies
The normal leakage electric current of electrical circuit may also reach several to hundreds of milliamperes, be more than the setting valve of Aftercurrent protecting equipment, occur
Mistrip acts, and greatly reduces the Reliability of Microprocessor of Aftercurrent protecting equipment and correct operational percentage, or even cause not throwing
The problems such as fortune.
Whether drawbacks described above shows using the size of leakage current virtual value as executing the criterion of trip operation and can cause to remain
Aftercurrent protective device mistrip, the current protective device that originally should not especially trip when not having human or animal to get an electric shock
Because leakage current virtual value is larger to cause mistrip, the reliability of residual current protecting is reduced, power supply grid is affected
Normal power supply.
Invention content
The technical problem to be solved by the present invention is to how to avoid mistrip, the reliability of residual current protecting is improved.
In order to solve the above technical problems, the present invention proposes a kind of method for protecting residual current and system.
In a first aspect, this method includes：
Acquire the leakage current signal in power supply grid；
Collected leakage current signal is pre-processed；
The isolated organism shock current signal from pretreated leakage current signal, the organism shock current letter
It number gets an electric shock for judging whether there is organism；
Judge whether the organism shock current signal isolated is more than electric current preset value,
If so, executing residual current protecting trip operation.
Optionally, described that collected leakage current signal is pre-processed, including：
Equalization is carried out to collected leakage current signal to handle；
Treated to going equalization, and leakage current signal carries out whitening processing.
Optionally, equalization is carried out to collected leakage current signal using following formula to handle：
Wherein, n is the number of the collected leakage current signal in predetermined period, xi(t) it is let out for collected i-th
Leakage current signal, 1≤i≤n,To go equalization treated leakage current signal to i-th of leakage current signal.
Optionally, using following formula, treated to going equalization, and leakage current signal carries out whitening processing：
Wherein, V is whitening matrix,Equalization is gone to be all in the predetermined period treated leakage current signal shape
At signal vector, Z is signal vectorThe signal vector obtained after whitening processing.
Optionally, the whitening matrix V is calculated using following formula：
V=D-1/2ET
Wherein, E is the signal vectorCorrelation matrix RxFeature matrix, D be the signal vector's
The diagonal matrix of feature vector, T are the predetermined period.
Optionally, using following formula isolated organism shock current signal：
Y=WZ
Wherein, W is separation matrix, and Y is isolated organism shock current signal vector.
Optionally, the separation matrix is determined using fast independent component analysis algorithm.
Optionally, the leakage current signal in the extraction power supply grid, including：
The leakage current signal in power supply grid is acquired using zero sequence current mutual inductor.
Second aspect, the system include：
Acquisition module, for acquiring the leakage current signal in power supply grid；
Preprocessing module, for being pre-processed to collected leakage current signal；
Separation module is used for isolated organism shock current signal, the life from pretreated leakage current signal
Object shock current signal gets an electric shock for judging whether there is organism；
Whether judgment module, the organism shock current signal for judging to isolate are more than electric current preset value；
Execution module, it is surplus for when judging that the organism shock current signal is more than the electric current preset value, executing
Aftercurrent trip protection acts.
Optionally, the preprocessing module includes：
First pretreatment unit, for being carried out at equalization to the collected leakage current signal of the acquisition module
Reason；
Second pretreatment unit, for treated to going equalization, leakage current signal carries out whitening processing.
In method for protecting residual current provided by the invention and system, located in advance by the leakage current signal to acquisition
Reason, in order to detach bioagent shock current signal from leakage current signal.It is isolated using from leakage current signal
The organism shock current signal that comes rather than leakage current signal carries out subsequent judgement, avoid since leakage current is larger
And mistrip is caused, improve the reliability of residual current protecting.Simultaneously using electric current preset value to whether really having organism
Electric shock is judged, and then improves the accuracy of judgement.
Description of the drawings
By reference to attached drawing can be more clearly understood the present invention characteristic information and advantage, attached drawing be schematically without
It is interpreted as carrying out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 shows the flow diagram according to one embodiment of method for protecting residual current of the present invention；
Fig. 2 shows the structure diagrams according to one embodiment of residual current protecting system of the present invention.
Specific implementation mode
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
The present invention provides a kind of method for protecting residual current, as shown in Figure 1, this method includes：
Step S1, the leakage current signal in power supply grid is acquired；
Step S2, collected leakage current signal is pre-processed；
Step S3, bioagent shock current signal, the organism are detached from pretreated leakage current signal
Shock current signal gets an electric shock for judging whether there is organism；
Step S4, judge whether the organism shock current signal isolated is more than electric current preset value；
Step S5, when judging that the organism shock current signal is more than the electric current preset value, residual current is executed
Trip protection acts.
Method for protecting residual current provided by the invention, by acquire leakage current signal, and to leakage current signal into
Row pretreatment, in order to detach bioagent shock current signal from leakage current signal.Theoretically, when nothing has organism
When electric shock, organism shock current signal is 0.But the processes such as data sampling and processing are there may be factors such as certain errors,
The organism shock current signal isolated is not necessarily 0, is fainter signal under normal circumstances.When there is organism electric shock
When, organism shock current is will produce, which is blended in monitored leakage current, is detached to leakage current
Afterwards, larger organism shock current signal can be isolated.Therefore the organism isolated is touched using an electric current preset value
Electric current signal judged, to learn organism shock current signal be due to there is organism electric shock caused by, or place
Caused by reason or calculating equal error, and then judge whether to need to trip.In fact, electric current preset value is residual current protecting dress
The setting valve set.Once organism shock current signal is more than electric current preset value, illustrates there is organism to get an electric shock, need to hold at this time
Row trip operation carries out residual current protecting.Since the actuation time of residual current protecting is extremely short, electricity can be cut off in time
Source avoids organism from causing electric shock or reduces suffered electric shock.
As it can be seen that the method judged using leakage current virtual value in compared to the prior art, the present invention is used from electric leakage electricity
The organism shock current signal separated in stream signal is judged, is avoided and is caused false tripping since leakage current is larger
Lock improves the reliability of residual current protecting.Simultaneously using electric current preset value to whether really thering is organism electric shock to sentence
It is disconnected, and then improve the accuracy of judgement.
In the specific implementation, step S2 may include unshowned in Fig. 1：
Step S21, equalization is carried out to collected leakage current signal to handle；
Step S22, treated to going equalization, and leakage current signal carries out whitening processing.
As it can be seen that preprocessing process may include equalization processing, whitening processing, equalization processing, whitening processing are removed just
In to the subsequent mask work of leakage current signal progress.
In the specific implementation, step S21, which may be used following formula and carry out equalization, is handled：
Wherein, n is the number of the collected leakage current signal in predetermined period, xi(t) it is let out for collected i-th
Leakage current signal, 1≤i≤n,To go equalization treated leakage current signal to i-th of leakage current signal.
In practical applications, the data that may be used in 2 or 4 predetermined periods are pre-processed, and ensure the standard calculated
True property.In addition, in order to ensure the promptness of residual current protecting, predetermined period is generally 10-1Second-time.
It is being embodied, step S22 may be used following formula and carry out whitening processing：
Wherein, V is whitening matrix,Equalization is gone to be all in the predetermined period treated leakage current signal shape
At signal vector, Z is signal vectorThe signal vector obtained after whitening processing.
After the linear transformation of whitening matrix, the signal vector Z of output is made to meet correlation matrix RxFor unit matrix
Condition.
In the specific implementation, following formula may be used and calculate the whitening matrix V：
V=D-1/2ET
Wherein, E is the signal vectorCorrelation matrix RxFeature matrix, D be the signal vector's
The diagonal matrix of feature vector, T are the predetermined period.
It is understandable to be,Correlation matrix be Rx=EDET=ED1/2D1/2ET, why correlation matrix can be in this way
Decomposition is because correlation matrix is symmetrical matrix, and non-is less than 0.Wherein D is orthogonal matrix.
In specific implementation, following formula isolated organism shock current signal may be used：
Y=WZ
Wherein, W is separation matrix, and Y is isolated organism shock current signal vector.
Pass through each organism shock current signal in this organism shock current signal vector and electric current preset value
Compare, if there are multiple organism shock current signals to be all higher than electric current preset value in predetermined period, organism can have been regarded as
It gets an electric shock.When only other one or two of organism shock current signal is more than electric current preset value, then assert may be due to
Deviation caused by the reasons such as acquisition, calculating.Therefore the standard for judging that judgement can be improved is carried out using multiple data in predetermined period
True property, avoids mistrip, improves the reliability of Aftercurrent protecting equipment.
In specific implementation, fast independent component analysis algorithm may be used and determine the separation matrix.Quickly it is independent at
Point parser (Fast-Independent Component Analysis) is also referred to as fixed point algorithm, is Blind Signal Separation
One kind of technology is a kind of quick optimizing iterative algorithm.The algorithm may be implemented using negentropy maximum as a search direction
The extraction independent source of sequence.There are following relationships between independent source and negentropy：
J (Y) is constant, to keep mutual information I (Y) minimum, it is only necessary to find a suitable separation matrix and go to maximize respectively
From edge negentropy, that is, meetIt is maximum.And then be iterated to obtain optimal separation matrix by optimization algorithm, to
Bioagent shock current signal is detached in leakage current signal.
Here, though using the isolated isolated organism shock current signal of fast independent component analysis algorithm from when
Domain all maintains the integrality of source signal still from frequency domain, can be with the good criterion of trip operation.
In specific implementation, the leakage current signal in zero sequence current mutual inductor acquisition power supply grid can be utilized.
Based on identical inventive concept, the present invention also provides a kind of residual current protecting systems, as shown in Fig. 2, the system
100 include：
Acquisition module 101, for acquiring the leakage current signal in power supply grid；
Preprocessing module 102, for being pre-processed to collected leakage current signal；
Separation module 103, for the isolated organism shock current signal from pretreated leakage current signal；
Whether judgment module 104, the organism shock current signal for judging to isolate are more than electric current preset value,
Execution module 105, for when judging that the organism shock current signal is more than the electric current preset value, executing
Residual current protecting trip operation.
Optionally, the preprocessing module 102 includes：
First pretreatment unit 1021, for carrying out equalization to the collected leakage current signal of the acquisition module
Processing；
Second pretreatment unit 1022, for treated to going equalization, leakage current signal carries out whitening processing.
Residual current protecting system provided by the invention can be the software control operated on Aftercurrent protecting equipment
System can also be the software control system operated in except Aftercurrent protecting equipment on other devices, by electric to residue
Stream protective device sends out tripping control command and completes residual current protecting trip operation.
Residual current protecting system provided by the invention is the function structure of method for protecting residual current provided by the invention
Module, explanation, explanation and advantageous effect in relation to content etc. refer to the corresponding portion in method for protecting residual current of the present invention
Point, details are not described herein.
In the present invention, term " first ", " second " are used for description purposes only, and are not understood to indicate or imply opposite
Importance.Term " multiple " refers to two or more, unless otherwise restricted clearly.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case of bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (7)
1. a kind of method for protecting residual current, which is characterized in that including：
Acquire the leakage current signal in power supply grid；
Collected leakage current signal is pre-processed, including：Equalization is carried out to collected leakage current signal
Processing；Treated to going equalization, and leakage current signal carries out whitening processing, and using following formula to collected leakage current
Signal carries out equalization and handles：
Wherein, n is the number of the collected leakage current signal in predetermined period, xi(t) it is collected i-th leakage electricity
Stream signal, 1≤i≤n,To go equalization treated leakage current signal to i-th of leakage current signal；
Bioagent shock current signal, the organism shock current signal are detached from pretreated leakage current signal
It gets an electric shock for judging whether there is organism；
Judge whether the organism shock current signal isolated is more than electric current preset value,
If so, executing residual current protecting trip operation.
2. method for protecting residual current according to claim 1, which is characterized in that using following formula to go equalization handle after
Leakage current signal carry out whitening processing：
Wherein, V is whitening matrix,Go equalization treated leakage current signal to be formed to be all in the predetermined period
Signal vector, Z are signal vectorThe signal vector obtained after whitening processing.
3. method for protecting residual current according to claim 2, which is characterized in that calculate the whitening matrix using following formula
V：
V=D-1/2ET
Wherein, E is the signal vectorCorrelation matrix RxFeature matrix, D be the signal vectorFeature to
The diagonal matrix of amount, T are the predetermined period.
4. method for protecting residual current according to claim 2, which is characterized in that isolate the organism using following formula
Shock current signal：
Y=WZ
Wherein, W is separation matrix, and Y is isolated organism shock current signal vector.
5. method for protecting residual current according to claim 4, which is characterized in that use fast independent component analysis algorithm
Determine the separation matrix.
6. according to any method for protecting residual current of claim 1-5, which is characterized in that in the extraction power supply grid
Leakage current signal, including：
The leakage current signal in power supply grid is acquired using zero sequence current mutual inductor.
7. a kind of residual current protecting system, which is characterized in that including：
Acquisition module, for acquiring the leakage current signal in power supply grid；
Preprocessing module, for being pre-processed to collected leakage current signal；
Separation module, for isolated organism shock current signal, the organism from pretreated leakage current signal
Shock current signal gets an electric shock for judging whether there is organism；
Whether judgment module, the organism shock current signal for judging to isolate are more than electric current preset value；
Execution module, for when judging that the organism shock current signal is more than the electric current preset value, executing remaining electricity
Flow trip protection action；
The preprocessing module includes：
First pretreatment unit is handled for carrying out equalization to the collected leakage current signal of the acquisition module, and
Equalization is carried out using following formula to collected leakage current signal to handle：
Wherein, n is the number of the collected leakage current signal in predetermined period, xi(t) it is collected i-th leakage electricity
Stream signal, 1≤i≤n,To go equalization treated leakage current signal to i-th of leakage current signal；
Second pretreatment unit, for treated to going equalization, leakage current signal carries out whitening processing.
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| CN113112035B (en) * | 2021-03-15 | 2022-04-22 | 国网湖北省电力有限公司电力科学研究院 | Fault leakage current separation method and device based on cross self-coding network |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868139A (en) * | 2012-09-10 | 2013-01-09 | 中国农业大学 | Electric shock signal transient component identification method and residual current protection device |
| WO2015072672A1 (en) * | 2013-11-13 | 2015-05-21 | 주식회사 에렐 | Three-phase earth leakage breaker for protecting against electrical shock |
| CN105334413A (en) * | 2015-10-16 | 2016-02-17 | 四川大学 | Electric shock accident characteristic signal detection method based on SCICA (Single Channel Independent Component Analysis) method |
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2015
- 2015-11-26 CN CN201510845027.5A patent/CN105977906B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868139A (en) * | 2012-09-10 | 2013-01-09 | 中国农业大学 | Electric shock signal transient component identification method and residual current protection device |
| WO2015072672A1 (en) * | 2013-11-13 | 2015-05-21 | 주식회사 에렐 | Three-phase earth leakage breaker for protecting against electrical shock |
| CN105334413A (en) * | 2015-10-16 | 2016-02-17 | 四川大学 | Electric shock accident characteristic signal detection method based on SCICA (Single Channel Independent Component Analysis) method |
Non-Patent Citations (1)
| Title |
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| 基于局部均值分解的触电故障信号瞬时参数提取;韩晓慧等;《农业工程学报》;20150930;第221-227页 * |
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