CN108306256B - Prevent the method and residual current circuit breaker of residual current circuit breaker malfunction - Google Patents
Prevent the method and residual current circuit breaker of residual current circuit breaker malfunction Download PDFInfo
- Publication number
- CN108306256B CN108306256B CN201810126025.4A CN201810126025A CN108306256B CN 108306256 B CN108306256 B CN 108306256B CN 201810126025 A CN201810126025 A CN 201810126025A CN 108306256 B CN108306256 B CN 108306256B
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- Prior art keywords
- residual current
- circuit breaker
- value
- residual
- current circuit
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Classifications
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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
- H02H3/26—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
-
- 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
- H02H3/006—Calibration or setting of parameters
Abstract
The invention discloses a kind of methods for preventing residual current circuit breaker malfunction.The ratio of the actual current in route and residual current circuit breaker rated current is obtained in real timeK, and in ratioKResidual current operating value is adjusted in real time when more than or equal to 1: when 1≤K< K max When,KBigger, residual current operating value is bigger and residual current operating value is less than the permitted maximum residual electric current action value of the residual current circuit breaker；WhenK≥K maxWhen, residual current operating value is the permitted maximum residual electric current action value of the residual current circuit breaker；K maxFor the preset value greater than 1.The invention also discloses a kind of residual current circuit breakers.The present invention prevents the malfunction of residual current circuit breaker caused by overloading by software mode, does not need the volume for increasing iron core in mutual inductor again while effectively improving residual current circuit breaker security reliability.
Description
Technical field
The present invention relates to a kind of residual current circuit breaker more particularly to a kind of sides for preventing residual current circuit breaker malfunction
Method.
Background technique
Residual current circuit breaker (residual current circuit-breakers) is a kind of for working normally
Under the conditions of connect, carrying and breaking current and under prescribed conditions make contact disconnected when residual current reaches a specified value
The mechanical switch electric appliance opened.Residual current circuit breaker has had been more and more widely used, and can be used to provide mediate contact to people
Protection, it is also possible to prevent from generating fire hazard caused by earth-fault current, and can be used to distribute because of apparatus insulated damage
The overload and short circuit of electric energy and protection circuit and power-supply device, the infrequently conversion and motor for being alternatively arranged as route are infrequently opened
It is dynamic to be used.
There are many factor for influencing residual current effective protection, other than residual current circuit breaker sole mass problem, influence
Its protect validity because being known as: under large load current residual current circuit breaker be easy malfunctions.Under normal circumstances, supply lines
Road allows the overload with the presence of certain time, long for the time relative surplus current protection, therefore it is required that sending out in overload
During life, residual current protecting should not be caused to malfunction due to unbalance response.And this malfunction is since residual current is disconnected
Zero sequence current mutual inductor inside the device of road, with the increase of overcurrent multiple, the false residual current electric current generated by unbalance response
Caused by.
The malfunction of residual current circuit breaker caused by overloading in order to prevent, using the body for increasing zero sequence current mutual inductor iron core
Product can prevent malfunction to a certain extent.But the iron core of one side zero sequence current mutual inductor product uses permalloy material,
The product cost of permalloy is expensive, greatly increasing for cost is caused to a certain extent, on the other hand due to circuit breaker
Be increasingly miniaturized, the increase of zero sequence current mutual inductor core volume is bound to cause the increase of zero sequence current mutual inductor volume, just
It is unable to satisfy the demand of breaker miniaturization.
On the one hand it needs zero sequence current mutual inductor to minimize, reduces the volume of mutual inductor, meet the need of breaker miniaturization
It asks, if on the other hand to meet the performance requirement of breaker simultaneously and need to increase the volume of iron core in mutual inductor, this is just made
At awkward condition, it is otherwise just unable to satisfy the performance requirement of residual current circuit breaker.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide one kind to prevent residual current breaking
The method of device malfunction is prevented the malfunction of residual current circuit breaker caused by overloading by software mode, is effectively improving residue
The volume of iron core in increase mutual inductor is not needed while tie breaker security reliability again.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A method of preventing residual current circuit breaker malfunction, the real surplus of the residual current circuit breaker in the line
Electric current executes protection act when being more than or equal to residual current operating value；The actual current and residual current obtained in route in real time breaks
The ratio K of road device rated current, and ratio K be more than or equal to 1 when residual current operating value is adjusted in real time: when 1≤K <
KmaxWhen, K is bigger, and residual current operating value is bigger and residual current operating value is permitted most less than the residual current circuit breaker
Big residual current operating value；As K >=KmaxWhen, residual current operating value is the permitted maximum residual of the residual current circuit breaker
Electric current action value；KmaxFor the preset value greater than 1.
Preferably, KmaxValue range be more than or equal to 6.
Preferably, residual current operating value is adjusted in real time according to residual current setting value.
Further, the residual current setting value according to the positively related mode of actual current in route, in a system
It arranges and residual current setting value is automatically adjusted in preset gear.
Further, the permitted maximum residual electric current action value of the residual current circuit breaker is residual current open circuit
0.7 times of device maximum residual current setting value.
Following technical scheme can also be obtained according to identical invention thinking:
A kind of residual current circuit breaker, the real surplus electric current of the residual current circuit breaker in the line are more than or equal to surplus
Protection act is executed when aftercurrent action value；The residual current circuit breaker includes faulty action preventing module, and the faulty action preventing module is used for
The ratio K of the actual current in route and residual current circuit breaker rated current is obtained in real time, and when ratio K is more than or equal to 1
Residual current operating value is adjusted in real time: as 1≤K < KmaxWhen, K is bigger, and residual current operating value is bigger and residual current
Action value is less than the permitted maximum residual electric current action value of the residual current circuit breaker；As K >=KmaxWhen, residual current acting
Value is the permitted maximum residual electric current action value of the residual current circuit breaker；KmaxFor the preset value greater than 1.
Preferably, KmaxValue range be more than or equal to 6.
Preferably, faulty action preventing module adjusts residual current operating value according to residual current setting value in real time.
Further, the residual current setting value according to the positively related mode of actual current in route, in a system
It arranges and residual current setting value is automatically adjusted in preset gear.
Further, the permitted maximum residual electric current action value of the residual current circuit breaker is residual current open circuit
0.7 times of device maximum residual current setting value.
Compared with prior art, technical solution of the present invention has the advantages that
The present invention prevents the malfunction of residual current circuit breaker caused by overloading by software mode, both can be to avoid because of mistake
Load causes zero sequence current mutual inductor to malfunction because output signal is caused to increase for unbalance response, and can be to during overload
The failure electric leakage of generation is fast and effeciently protected.Using technical solution of the present invention, zero-sequence current can also be further decreased
The thickness of mutual inductor shielded layer, thus reduce the volume of zero sequence current mutual inductor, it is final to realize residual current circuit breaker miniaturization
Purpose.
Detailed description of the invention
Fig. 1 is a kind of specific implementation flow of the method for the present invention.
Specific embodiment
The prior art prevents from overloading caused residual current circuit breaker by increasing zero sequence current mutual inductor core volume
The trend toward miniaturization of malfunction, such mode and breaker generates irreconcilable contradiction, to solve this problem, of the invention
Thinking is residual current circuit breaker malfunction caused by preventing from overloading by software mode, both can cause zero to avoid because of overload
Sequence current transformer is malfunctioned because output signal is caused to increase for unbalance response, and can be former to what is occurred during overload
Barrier electric leakage is fast and effeciently protected.
Specifically, in real time obtain route in actual current and residual current circuit breaker rated current ratio K, and than
Value K adjusts residual current operating value when being more than or equal to 1 in real time: as 1≤K < KmaxWhen, K is bigger, residual current operating value
Bigger and residual current operating value is less than the permitted maximum residual electric current action value of the residual current circuit breaker；As K >=Kmax
When, residual current operating value is the permitted maximum residual electric current action value of the residual current circuit breaker；KmaxIt is pre- greater than 1
If value.
The present invention is using the ratio K of actual current and residual current circuit breaker rated current in route as characterization line
The degree of load is passed by, and the residual current operating value of breaker is adjusted in real time according to the size of K when overloading generation, K
Value it is bigger, then overload it is more serious, in order to prevent residual current circuit breaker malfunction, correspondingly, residual current operating value is also got over
Greatly.If the value in view of K increases to a certain extent, residual current malfunction, therefore K will be easily causedmaxValue it is preferred
For more than or equal to 6.Such as K >=6, residual current operating value is directly set as the permitted maximum of the residual current circuit breaker
Residual current operating value；
The residual current operating value of existing residual current circuit breaker is typically set at the certain proportion of residual current setting value,
And residual current setting value can often be selected in the different multiple gears of height by client；Or according to the reality in route
The positively related mode of border electric current, within a preset range adjust automatically.In order to preferably be connected with the prior art, the present invention preferably according to
Residual current operating value is adjusted in real time according to residual current setting value.For example, for fixed residual current setting value, it can
With the coefficient increased to residual current setting value multiplied by an increase with K value, as residual current operating value.
For the ease of public understanding, below with a specific embodiment and in conjunction with attached drawing come to technical solution of the present invention into
Row is described in detail:
In the present embodiment residual current circuit breaker controller can according to the positively related mode of actual current in route,
Residual current setting gear I △ n is automatically adjusted in a series of preset gears, for example, can with 0.006A, 0.01A,
This potline current value of 0.03A, 0.1A, 0.3A, 0.5A, 1A, 3A, 10A, 30A therefrom selects several current values as I △ n
Gear, when electric current I is increased to a certain degree in route, controller automatically adjusts residual current setting value to higher by one
Shelves.
As shown in Figure 1, residual current circuit breaker controller carries out AD sampling to electric current, the residual current in power supply line
And calculated, obtain the actual current I and real surplus electric current I △ in route；Calculate actual current I and the specified electricity of breaker
The ratio K of In is flowed, and according to the size of K, residual current operating value I △ d is adjusted in real time；When the residue that sampling obtains
When the value of electric current I △ is greater than residual current operating value I △ d, residual current circuit breaker executes protection act.
As shown in Figure 1, the Specific Principles being adjusted in the present embodiment to residual current operating value I △ d are as follows:
When K is less than 1, residual current operating value I △ d=0.7I △ n；
When K is 1 to 2, residual current operating value I △ d=0.8I △ n；
When K is 2 to 3, residual current operating value I △ d=0.9I △ n；
When K is 3 to 4, residual current operating value I △ d=0.7I △ (n+1)；
When K is 4 to 5, residual current operating value I △ d=0.8I △ (n+1)；When
When K is 5 to 6, residual current operating value I △ d=0.9I △ (n+1)；
When K is greater than 6, residual current operating value I △ d=0.7I △ nmax.
Wherein, I △ n is that residual current currently sets gear, and I △ (n+1) indicates that residual current currently sets gear more
One grade high (such as residual current currently sets gear I △ n as 0.03A, then I △ (n+1) is 0.1A), I △ nmax indicates remaining
The highest gear (i.e. the maximum residual current setting value of the residual current circuit breaker) of current setting value.
According to the technical solution of the present invention, during power supply line's current overload, residual current operating value is with supply lines
The variation of actual current in road and be adjusted correspondingly, such as powered under such circumstances to can guarantee, power supply line is electric
Even if flowing up to 6In, the malfunction of residual current circuit breaker caused by out-of-balance current when will not occur because of starting.
When the overload current in power supply line gradually becomes smaller, with the reduction of actual current in power supply line, K value
It is gradually corresponding to reduce, so that residual current operating value I △ d is also gradually reduced, until being restored to initial value i.e. residual current acting
Value I △ d=0.7I △ n, I △ n at this time are the residual current setting value of initial set.
After the movement of power supply line's overload protection, residual current operating value reverts to regular event value I △ d=
0.7I △ n, I △ n at this time are the residual current setting value of initial set.
Residual current failure such as occurs, the present invention can carry out effective protection to residual current failure: when what sampling obtained remains
When the value of aftercurrent I △ is greater than current residual current operating value I △ d, residual current circuit breaker executes protection act.It limits surplus
Aftercurrent operating time of protection, after residual current protection action, residual current operating value reverts to regular event value I △ d
=0.7I △ n, I △ n at this time are the residual current setting value of initial set.
Claims (10)
1. a kind of method for preventing residual current circuit breaker malfunction, the real surplus electricity of the residual current circuit breaker in the line
Stream executes protection act when being more than or equal to residual current operating value；It is characterized in that, in real time obtain route in actual current with
The ratio of residual current circuit breaker rated currentK, and in ratioKResidual current operating value is adjusted in real time when more than or equal to 1
It is whole: when 1≤K<K max When,KBigger, residual current operating value is bigger and residual current operating value is less than the residual current circuit breaker
Permitted maximum residual electric current action value；WhenK≥K maxWhen, residual current operating value is allowed by the residual current circuit breaker
Maximum residual electric current action value；K maxFor the preset value greater than 1.
2. method as described in claim 1, which is characterized in thatK maxValue range be more than or equal to 6.
3. method as described in claim 1, which is characterized in that carried out according to residual current setting value to residual current operating value real
When adjust.
4. method as claimed in claim 3, which is characterized in that the residual current setting value according to the actual current in route
Positively related mode is automatically adjusted residual current setting value in a series of preset gears.
5. method as claimed in claim 4, which is characterized in that the permitted maximum residual electric current movement of the residual current circuit breaker
Value is 0.7 times of the residual current circuit breaker maximum residual current setting value.
6. a kind of residual current circuit breaker, the real surplus electric current of the residual current circuit breaker in the line is more than or equal to residue
Protection act is executed when electric current action value；It is characterized in that, the residual current circuit breaker includes faulty action preventing module, the faulty action preventing
Module for obtaining the ratio of the actual current in route and residual current circuit breaker rated current in real timeK, and in ratioKIt is greater than
Residual current operating value is adjusted in real time when equal to 1: when 1≤K<K max When,KBigger, residual current operating value is bigger and surplus
Aftercurrent action value is less than the permitted maximum residual electric current action value of the residual current circuit breaker；WhenK≥K maxWhen, remaining electricity
Stream action value is the permitted maximum residual electric current action value of the residual current circuit breaker；K maxFor the preset value greater than 1.
7. residual current circuit breaker as claimed in claim 6, which is characterized in thatK maxValue range be more than or equal to 6.
8. residual current circuit breaker as claimed in claim 6, which is characterized in that faulty action preventing module is according to residual current setting value pair
Residual current operating value is adjusted in real time.
9. residual current circuit breaker as claimed in claim 8, which is characterized in that the residual current setting value according to in route
The positively related mode of actual current, residual current setting value is automatically adjusted in a series of preset gears.
10. residual current circuit breaker as claimed in claim 9, which is characterized in that the permitted maximum of the residual current circuit breaker
Residual current operating value is 0.7 times of the residual current circuit breaker maximum residual current setting value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126025.4A CN108306256B (en) | 2018-02-08 | 2018-02-08 | Prevent the method and residual current circuit breaker of residual current circuit breaker malfunction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126025.4A CN108306256B (en) | 2018-02-08 | 2018-02-08 | Prevent the method and residual current circuit breaker of residual current circuit breaker malfunction |
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| CN108306256A CN108306256A (en) | 2018-07-20 |
| CN108306256B true CN108306256B (en) | 2019-07-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2457733Y (en) * | 2000-09-21 | 2001-10-31 | 吴赛乐 | Leakage brake with variable rated residual current operation value |
| CN1604418A (en) * | 2004-11-04 | 2005-04-06 | 河北工业大学 | Automatic tracking protector for earth leakage and operation method thereof |
| CN103683186A (en) * | 2012-09-05 | 2014-03-26 | 上海精翊电器有限公司 | Residual current breaker with self-tuning function |
| CN105576597A (en) * | 2016-02-29 | 2016-05-11 | 上海电机学院 | Residual current motion protection method and device |
| CN105655972A (en) * | 2016-04-05 | 2016-06-08 | 浙江工业大学 | Self-adaptive leakage protection method for residual current operated protective device |
-
2018
- 2018-02-08 CN CN201810126025.4A patent/CN108306256B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2457733Y (en) * | 2000-09-21 | 2001-10-31 | 吴赛乐 | Leakage brake with variable rated residual current operation value |
| CN1604418A (en) * | 2004-11-04 | 2005-04-06 | 河北工业大学 | Automatic tracking protector for earth leakage and operation method thereof |
| CN103683186A (en) * | 2012-09-05 | 2014-03-26 | 上海精翊电器有限公司 | Residual current breaker with self-tuning function |
| CN105576597A (en) * | 2016-02-29 | 2016-05-11 | 上海电机学院 | Residual current motion protection method and device |
| CN105655972A (en) * | 2016-04-05 | 2016-06-08 | 浙江工业大学 | Self-adaptive leakage protection method for residual current operated protective device |
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| CN108306256A (en) | 2018-07-20 |
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