CN106451337B - A kind of over-current protection method acted using fault component - Google Patents
A kind of over-current protection method acted using fault component Download PDFInfo
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- CN106451337B CN106451337B CN201611000426.2A CN201611000426A CN106451337B CN 106451337 B CN106451337 B CN 106451337B CN 201611000426 A CN201611000426 A CN 201611000426A CN 106451337 B CN106451337 B CN 106451337B
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- supply line
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000001681 protective effect Effects 0.000 claims abstract description 23
- 238000005070 sampling Methods 0.000 claims description 8
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract 3
- 208000032368 Device malfunction Diseases 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
-
- 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
- H02H3/08—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 excess current
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- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of over-current protection method acted using fault component.It includes the present current value for reading supply line；Preserve the line electricity flow valuve of this reading；Line electricity flow valuve=fault current component that this line electricity flow valuve read-last time reads；Whether failure judgement current component is more than setting valve；Over current fault processing routine is executed, microcomputer protecting device can send out overcurrent protective device actuating signal；Execution normal operation processing routine and etc..Effect of the present invention：By the current subtraction of the electric current measured in real time and a upper cycle for microcomputer protecting device storage, judge whether its difference is more than setting valve, to judge whether overcurrent protective device should act.This protection mechanism is unrelated with size of current because only judging the variable quantity of current flow, therefore is not influenced by load current, so as to greatly improve the sensitivity of overcurrent protective device.
Description
Technical field
The invention belongs to Computer Control Technology fields, more particularly to a kind of overcurrent protection acted using fault component
Method.
Background technology
Traditional microcomputer overcurrent protection principle is to measure the real-time current value of circuit first, when line current is protected more than overcurrent
When the setting valve of protection unit, overcurrent protective device action, tripping line switching, to disengagement failure line power.In addition, to mistake
The setting valve for flowing protective device has certain requirement, it is necessary to which be staggered circuit maximum load current, to prevent when circuit is in maximum
Overcurrent protective device malfunction when load operation.
Based on this requirement, the setting valve of overcurrent protective device is generally all bigger, therefore by the mistake of this adaptive setting
Stream its sensitivity of protective device is influenced very big by system operation mode：In the case of system maximum operational mode, due to
Line impedance X at this time is in minimum value, and the sensitivity of overcurrent protective device is very high, and the overcurrent protective device can when breaking down
With regular event；In the case of system minimum operational mode, since line impedance X at this time is in maximum value, to lead
Cause the sensitivity of overcurrent protective device that may not reach requirement, therefore cause protective value to be deteriorated even to fail.
Invention content
To solve the above-mentioned problems, the purpose of the present invention is to provide a kind of overcurrent protection sides acted using fault component
Method.
In order to achieve the above object, the over-current protection method provided by the invention using fault component action includes in order
The following steps of execution：
The S1 stages of step 1) current sample：Current sample is adopted for the cycle of each cycle for supply line's electric current
Unitary sampling in sample reads the present current value of supply line；
Step 2) preserves the S2 stages of this sampled value：Preserve the present current value of the supply line of this reading；
Step 3) calculates the S3 stages of fault current component：Present current value-last time of this supply line read reads
Current value=fault current component of the supply line taken；
Whether step 4) failure judgement current component is more than the S4 stages of setting valve：Whether failure judgement current component is more than
5) setting valve thens follow the steps if it is judged that being "Yes", otherwise execute step 6) in next step；
Step 5) executes the S5 stages of exception handles：Execute over current fault processing routine, microcomputer protecting device
Overcurrent protective device actuating signal is sent out, this operation is then terminated, return and waits for operation next time；
Step 6) executes the S6 stages of normal operation program：Normal operation processing routine is executed, terminates this circular flow, returns
It returns and subsequent cycle is waited for run.
In step 3), the current value for the supply line that the last time reads is that microcomputer protecting device recycles institute upper one
The current sampling data for previous cycle of acquisition.
In step 4), the setting valve is that next stage protects short circuit current of the end under system minimum operational mode
1/2.
In step 5), the exception handles is to send out actuating signal, overcurrent protective device action, tripping circuit
Switch, disengagement failure line power.
The effect of over-current protection method provided by the invention using fault component action：
The current value for the upper cycle that the current value measured in real time is stored with microcomputer protecting device is subtracted each other, judges that it is poor
Whether value is more than setting valve, to judge whether overcurrent protective device should act.This protection mechanism is because only judge current
The variable quantity of electric current, it is unrelated with size of current, therefore do not influenced by load current, so as to greatly improve overcurrent protection dress
The sensitivity set.
Description of the drawings
Fig. 1 is the over-current protection method flow chart provided by the invention acted using fault component.
Specific implementation mode
In the following with reference to the drawings and specific embodiments to the over-current protection method provided by the invention acted using fault component
It is described in detail.
This method can substantially improve overcurrent protective device using the microcomputer protecting device that can calculate fault current component
Performance because when overcurrent protective device is adjusted by faults current component principle, setting valve can not be by load
The influence of electric current, setting valve need to be only arranged according to the out-of-balance current in the case of the non-faulting that is staggered, and such setting valve can be with
Very little is adjusted to obtain, this sensitivity that overcurrent protective device is just improved for realization provides possibility.
The principle for eliminating non-faulting component is principle of stacking.When short circuit occurs, the actual measurement of overcurrent protective device installation place
Electric current subtracts the electric current under non-faulting state, and difference is known as fault current component.The present invention stores the electric current before failure
Come, then the electric current before subtracting failure in the fault current measured, you can obtain fault current component.
A cycle current sampling data before failure can be stored in a region in RAM by microcomputer protecting device, then
Itself and present current value are subtracted each other by calculation procedure, calculate fault current component.When the fault current component is more than setting valve
When, microcomputer protecting device can send out overcurrent protection actuating signal.
As shown in Figure 1, the over-current protection method provided by the invention using fault component action includes executing in order
The following steps：
The S1 stages of step 1) current sample：Current sample is adopted for the cycle of each cycle for supply line's electric current
Unitary sampling in sample reads the present current value of supply line；
Step 2) preserves the S2 stages of this sampled value：Preserve the present current value of the supply line of this reading；
Step 3) calculates the S3 stages of fault current component：Present current value-last time of this supply line read reads
Current value=fault current component of the supply line taken；
Whether step 4) failure judgement current component is more than the S4 stages of setting valve：Whether failure judgement current component is more than
5) setting valve thens follow the steps if it is judged that being "Yes", otherwise execute step 6) in next step；
Step 5) executes the S5 stages of exception handles：Execute over current fault processing routine, microcomputer protecting device
Overcurrent protective device actuating signal is sent out, this operation is then terminated, return and waits for operation next time；
Step 6) executes the S6 stages of normal operation program：Normal operation processing routine is executed, terminates this circular flow, returns
It returns and subsequent cycle is waited for run.
In step 3), the current value for the supply line that the last time reads is that microcomputer protecting device recycles institute upper one
The current sampling data for previous cycle of acquisition.
In step 4), the setting valve is that next stage protects short circuit current of the end under system minimum operational mode
1/2.
In step 5), the exception handles is that microcomputer protecting device sends out actuating signal, overcurrent protective device
Action, tripping line switching, disengagement failure line power.
Claims (3)
1. a kind of over-current protection method acted using fault component, it is characterised in that：It is described using fault component action
Over-current protection method includes the following steps executed in order：
The S1 stages of step 1) current sample：Current sample is in the circulating sampling of each cycle of supply line's electric current
Unitary sampling, read the present current value of supply line；
Step 2) preserves the S2 stages of this sampled value：Preserve the present current value of the supply line of this reading；
Step 3) calculates the S3 stages of fault current component：What present current value-last time of this supply line read read
Current value=fault current component of supply line；The current value for the supply line that the last time reads is microcomputer protecting device
In the current sampling data for previous cycle that a upper cycle is acquired；
Whether step 4) failure judgement current component is more than the S4 stages of setting valve：Whether failure judgement current component, which is more than, is adjusted
5) value thens follow the steps if it is judged that being "Yes", otherwise execute step 6) in next step；
Step 5) executes the S5 stages of exception handles：Over current fault processing routine is executed, microcomputer protecting device can be sent out
Then overcurrent protective device actuating signal terminates this operation, return and wait for operation next time；
Step 6) executes the S6 stages of normal operation program：Normal operation processing routine is executed, this circular flow is terminated, is returned simultaneously
Wait for subsequent cycle operation.
2. the over-current protection method according to claim 1 acted using fault component, it is characterised in that：In step 4)
In, the setting valve is that next stage protects the 1/2 of short circuit current of the end under system minimum operational mode.
3. the over-current protection method according to claim 1 acted using fault component, it is characterised in that：In step 5)
In, the exception handles is to send out actuating signal, overcurrent protective device action, tripping line switching, disengagement failure line
Road power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611000426.2A CN106451337B (en) | 2016-11-14 | 2016-11-14 | A kind of over-current protection method acted using fault component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611000426.2A CN106451337B (en) | 2016-11-14 | 2016-11-14 | A kind of over-current protection method acted using fault component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106451337A CN106451337A (en) | 2017-02-22 |
| CN106451337B true CN106451337B (en) | 2018-07-13 |
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|---|---|---|---|
| CN201611000426.2A Active CN106451337B (en) | 2016-11-14 | 2016-11-14 | A kind of over-current protection method acted using fault component |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490394A (en) * | 2013-09-30 | 2014-01-01 | 山东大学 | Self-synchronizing positive sequence fault component current differential protection method of active power distribution network |
| CN103529358A (en) * | 2013-08-15 | 2014-01-22 | 国家电网公司 | Method for detecting continuous high-impedance-grounded fault of medium-voltage distribution system by current information |
| CN103812095A (en) * | 2014-02-27 | 2014-05-21 | 国家电网公司 | Directional pilot protection method for power distribution network containing distributed generation |
| CN105226623A (en) * | 2015-10-20 | 2016-01-06 | 国网河南省电力公司电力科学研究院 | Containing the adaptive Current Protection method of the power distribution network of high permeability distributed power source |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2580934C1 (en) * | 2012-06-06 | 2016-04-10 | Абб Текнолоджи Лтд. | Method and device for identification of short circuit by means of differential current protection |
-
2016
- 2016-11-14 CN CN201611000426.2A patent/CN106451337B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529358A (en) * | 2013-08-15 | 2014-01-22 | 国家电网公司 | Method for detecting continuous high-impedance-grounded fault of medium-voltage distribution system by current information |
| CN103490394A (en) * | 2013-09-30 | 2014-01-01 | 山东大学 | Self-synchronizing positive sequence fault component current differential protection method of active power distribution network |
| CN103812095A (en) * | 2014-02-27 | 2014-05-21 | 国家电网公司 | Directional pilot protection method for power distribution network containing distributed generation |
| CN105226623A (en) * | 2015-10-20 | 2016-01-06 | 国网河南省电力公司电力科学研究院 | Containing the adaptive Current Protection method of the power distribution network of high permeability distributed power source |
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| CN106451337A (en) | 2017-02-22 |
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