CN108347038A - A kind of power-off protection method and system - Google Patents
A kind of power-off protection method and system Download PDFInfo
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- CN108347038A CN108347038A CN201710059497.8A CN201710059497A CN108347038A CN 108347038 A CN108347038 A CN 108347038A CN 201710059497 A CN201710059497 A CN 201710059497A CN 108347038 A CN108347038 A CN 108347038A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 94
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000004458 analytical method Methods 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H02J13/0006—
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- 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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The embodiment of the invention discloses a kind of power-off protection method and system, the system comprises：It is set at least one of low-voltage distribution apparatus mutual inductor, digital control terminal, breaker and self-locking device；Wherein, the digital control terminal is received by the running electric signal of the low-voltage distribution apparatus of at least one mutual inductor acquisition, processing analysis is carried out to the electric signal, when judging to meet separating brake condition, sending separating brake electric signal to the breaker makes the breaker open operation；When the digital control terminal judgement meets reclosing condition, sending combined floodgate electric signal to the breaker makes the breaker reclosing；After the breaker reclosing, when the digital control terminal judgement meets condition of self-locking, makes the breaker open operation to self-locking device transmission self-locking electric signal and lock sub-switching operation.It not only realizes intelligent power-off protection, also saves the input to low-voltage distribution system.
Description
Technical field
The present embodiments relate to technical field of electric equipment more particularly to a kind of power-off protection method and systems.
Background technology
Low-voltage distribution system is commonly used in the transmission voltage of power grid being reduced to distribution voltage, will be low using distribution transformer
Piezoelectricity is conveyed to low-voltage distribution apparatus.Include low-voltage circuit breaker in low-voltage distribution system, low-voltage circuit breaker is also known as automatic switch,
It is a kind of existing manual switch effect, and can carry out the electric appliance of decompression, under-voltage, overload and short-circuit protection automatically.
Common low-voltage circuit breaker has a single function, and does not adapt in practical application to the multi-functional requirement of breaker；And intelligence
Energy low-voltage circuit breaker is complicated and expensive, multiple breakers is usually needed in low-voltage distribution system so that low pressure is matched
Electric system cost is excessively high.
During realizing the embodiment of the present invention, inventor has found that the prior art at least has the following defects：Existing skill
Low-voltage circuit breaker in art is complicated, and cost is higher.
Invention content
The embodiment of the present invention is designed to provide a kind of power-off protection method and system, in the prior art low to solve
Voltage breaker is complicated, the higher problem of cost.
In a first aspect, the first aspect of the embodiment of the present invention provides a kind of circuit breaking protective system, including：It is set to low pressure
At least one of controller switching equipment mutual inductor, digital control terminal, breaker and self-locking device；Wherein, digital control terminal receives
The running electric signal of low-voltage distribution apparatus acquired by least one mutual inductor, processing analysis is carried out to electric signal, when
When judgement meets separating brake condition, sending separating brake electric signal to breaker makes breaker open operation；When digital control terminal judges to meet
When reclosing condition, sending combined floodgate electric signal to breaker makes breaker reclosing；After breaker reclosing, when digital control
When terminal judgement meets condition of self-locking, makes breaker open operation to self-locking device transmission self-locking electric signal and lock sub-switching operation.
Preferably, digital control terminal includes：Central processing unit, and the signal processing that is connect respectively with central processing unit
Unit lacks zero judging unit, phase shortage judging unit and reclosing judging unit；Wherein, at least one mutual inductor and signal processing
Unit connects, and the electric signal of low-voltage distribution apparatus is sent to signal processing unit；Signal processing unit to electric signal into
After row filtering, enhanced processing, it is sent to central processing unit；Central processing unit receives electric signal, handles electric signal
Analysis, when judging to meet separating brake condition, sending separating brake electric signal to breaker makes breaker open operation；Zero judging unit is lacked to judge
Whether the electric signal that signal processing unit receives lacks neutral signal, and when determination lacks neutral signal, to centre
It manages device and sends scarce zero electric signal；Phase shortage judging unit judges whether the electric signal that signal processing unit receives lacks and believes
Number, and when determination lacks phase signals, phase shortage electric signal is sent to central processing unit；Central processing unit is receiving scarce zero telecommunications
Number and/or phase shortage electric signal after, to breaker send separating brake electric signal make breaker open operation；Reclosing judging unit judges to meet
When reclosing condition, combined floodgate electric signal is sent to breaker.
Preferably, mutual inductor includes at least following one：Zero sequence transformer, current transformer and voltage transformer；Electrically
Signal includes at least one of：Electric leakage signal, current signal and voltage signal；Wherein, zero sequence transformer acquires low-voltage distribution
Signal processing unit equipment running electric leakage signal and be sent in digital control terminal；Current transformer acquisition low pressure is matched
Signal processing unit electric equipment running current signal and be sent in digital control terminal；Voltage transformer acquires low pressure
Signal processing unit controller switching equipment running voltage signal and be sent in digital control terminal.
Preferably, digital control terminal further includes：The input unit and storage unit being connect with central processing unit；Wherein,
Electric leakage rated current, rated current, rated voltage and the electric leakage of low-voltage distribution apparatus in operation are inputted by input unit certainly
Electric current is locked, and is stored into storage unit.
Preferably, separating brake condition includes at least following one：The corresponding leakage of the running electric leakage signal of low-voltage distribution apparatus
Electric current is more than the electric leakage rated current of setting；The corresponding effective current of the running current signal of low-voltage distribution apparatus, which is more than, to be set
Fixed rated current；The corresponding electric current of the running current signal of low-voltage distribution apparatus is more than the overload current of setting, or
Person is more than the short circuit current of setting；The three-phase imbalance rate determined according to the running current signal of the low-voltage distribution apparatus
More than the three-phase current unbalance threshold value of setting；The corresponding effective voltage of the running voltage signal of low-voltage distribution apparatus, which is more than, to be set
Fixed rated voltage；The corresponding voltage of the running voltage signal of low-voltage distribution apparatus be more than setting over-pressed voltage or
Less than the decompression voltage of setting；The three-phase imbalance voltage rate determined according to the running voltage signal of the low-voltage distribution apparatus
More than the imbalance of three-phase voltage threshold value of setting；Condition of self-locking includes：After breaker reclosing, obtained in set period of time
Zero sequence transformer acquisition the corresponding leakage current of the running electric leakage signal of low-voltage distribution apparatus be more than setting electric leakage from
Lock electric current.
Preferably, digital control terminal further includes：Electrical parameter processing unit, the electric energy being connect with central processing unit calculate single
Member, clock unit and display unit；Wherein, electrical parameter processing unit receives the electric signal sent by least one mutual inductor,
Transformation is carried out to electric signal and is filtered, and is sent to electric energy computing unit, electric energy computing unit is true according to clock unit
The operation data for determining low-voltage distribution apparatus, is sent to storage unit and is stored and be sent to display unit and shown.
The second aspect of second aspect, the embodiment of the present invention provides a kind of power-off protection method, including：It is breaking when determining
After thinking highly of combined floodgate, the running electric leakage of low-voltage distribution apparatus acquired by zero sequence transformer is obtained in set period of time and is believed
Number；When judging that electric leakage signal meets condition of self-locking, makes breaker open operation to self-locking device transmission self-locking electric signal and lock separating brake
Operation；Wherein, condition of self-locking includes：After determining breaker reclosing, in set period of time in low-voltage distribution apparatus operation
The corresponding leakage current of electric leakage signal be more than setting electric leakage latching current.
Preferably, method further includes：Obtain the running electric leakage signal of low-voltage distribution apparatus of zero sequence transformer acquisition；When
When judging that the corresponding leakage current of the running electric leakage signal of low-voltage distribution apparatus is more than the electric leakage rated current of setting, to open circuit
Device, which sends separating brake electric signal, makes breaker open operation；And/or obtain the running electricity of low-voltage distribution apparatus of current transformer acquisition
Flow signal；When judging that the corresponding effective current of current signal is more than the rated current of setting, separating brake telecommunications is sent to breaker
Number make breaker open operation；And/or it obtains voltage transformer and acquires the running voltage signal of low-voltage distribution apparatus；It is low when judging
When being press-fitted rated voltage of the corresponding effective voltage of the running voltage signal of electric equipment more than setting, separating brake is sent to breaker
Electric signal makes breaker open operation.
Preferably, reclosing condition includes：More than executing closing operation automatically after setting time.
Preferably, method further includes：The running voltage signal of low-voltage distribution apparatus for obtaining voltage transformer acquisition, when
When judging voltage signal phase shortage, sending separating brake electric signal to breaker makes breaker open operation；And/or it obtains voltage transformer and adopts
The running voltage signal of low-voltage distribution apparatus of collection sends separating brake electric signal when judging that voltage signal lacks zero to breaker
Make breaker open operation.
Provided in an embodiment of the present invention kind of circuit breaking protective system include：It is mutual to be set at least one of low-voltage distribution apparatus
Sensor, digital control terminal, breaker and self-locking device, mutual inductor monitor the running electric signal of low-voltage distribution apparatus, number
When control terminal judges that the running electric signal of low-voltage distribution apparatus meets separating brake condition, generating separating brake electric signal makes breaker
Sub-switching operation is executed, when judging to meet reclosing condition, generating combined floodgate electric signal makes breaker reclosing, when meeting from bolt
When part, generating self-locking electric signal makes breaker open operation and locks sub-switching operation, can be real by digital control terminal and breaker
Now intelligent power-off protection.Breaker uses the device with simple separating brake closing function, saves to low-voltage distribution system
Input.
Description of the drawings
Fig. 1 is a kind of structure diagram for circuit breaking protective system that the embodiment of the present invention one provides；
Fig. 2 is the structure diagram of the digital control terminal of the embodiment of the present invention；
Fig. 3 is a kind of step flow chart of power-off protection method provided by Embodiment 2 of the present invention；
Fig. 4 is a kind of step flow chart for power-off protection method that the embodiment of the present invention three provides.
Specific implementation mode
(identical label indicates identical element in several attached drawings) and embodiment below in conjunction with the accompanying drawings, implement the present invention
The specific implementation mode of example is described in further detail.Following embodiment is not limited to for illustrating the embodiment of the present invention
The range of the embodiment of the present invention.
It will be understood by those skilled in the art that the terms such as " first ", " second " in the embodiment of the present invention are only used for distinguishing
Different step, equipment or module etc. neither represent any particular technology meaning, also do not indicate that the inevitable logic between them is suitable
Sequence.
Embodiment one
Referring to Fig.1, a kind of structure diagram for circuit breaking protective system that the embodiment of the present invention one provides is shown, it specifically can be with
Including following module：
It is set at least one of low-voltage distribution apparatus mutual inductor 1, digital control terminal 2, breaker 3 and self-locking device 4.
Wherein, it is running electrical to receive the low-voltage distribution apparatus acquired by least one mutual inductor 1 for digital control terminal 2
Signal carries out processing analysis to electric signal, and when judging to meet separating brake condition, sending separating brake electric signal to breaker 3 makes to break
3 separating brake of road device.
When the judgement of digital control terminal meets reclosing condition, sending combined floodgate electric signal to breaker 3 makes 3 weight of breaker
It closes a floodgate, in the case, breaker 3 can select the breaker with switching-on mechanism, to realize reclosing.
After 3 reclosing of breaker, when the judgement of digital control terminal 2 meets condition of self-locking, self-locking is sent to self-locking device 4
Electric signal makes 3 separating brake of breaker and locks sub-switching operation.
Preferably, simplest release unit, including closing coil can be used in breaker 3 in embodiments of the present invention
(a kind of example of switching-on mechanism) and switching winding (a kind of example of brake separating mechanism) (can realize switch closing and switch opening work(
Energy), such as shunt release, this embodiment of the present invention is not especially limited.But it should be understood by those skilled in the art that its
Its switching-on mechanism and brake separating mechanism appropriate are equally applicable.
Existing intelligent breaker is integral type, i.e., all modules are all integrated in a device, therefore cost is higher,
And the embodiment of the present invention replaces intelligent breaker using digital control terminal, and use simple in structure, cheap breaker
The intelligent breaker function of intelligent breaker can be completed in device, and the function of intelligent separating brake is realized while saving cost.
Preferably, mutual inductor 1, digital control terminal 2, breaker in circuit breaking protective system provided in an embodiment of the present invention
3 and self-locking device 4 connect；Mutual inductor 1 may be disposed in the operation circuit in low-voltage distribution apparatus, for monitoring low-voltage distribution in real time
Electric signal in the operation circuit of equipment at work, electric signal can include but is not limited to：Electric leakage signal, electric current letter
Number, information of voltage, breaker 3 is connected in the power delivery circuit of low-voltage distribution apparatus, and self-locking device 4 and breaker 3 connect, self-locking device
The locking sub-switching operation of 4 control breakers.
Mutual inductor 1 includes at least following one：Zero sequence transformer 11, current transformer 12 and voltage transformer 13.
Wherein, zero sequence transformer 11 acquires the running electric leakage signal of low-voltage distribution apparatus；Current transformer 12 acquires low
It is press-fitted the running current signal of electric equipment；Voltage transformer 13 acquires the running voltage signal of low-voltage distribution apparatus.
Further, it with reference to Fig. 2, shows the structure diagram of the digital control terminal of the embodiment of the present invention 2, can specifically wrap
It includes such as lower unit：
Central processing unit 201, and connect respectively with central processing unit 201 signal processing unit 202, lack zero judge it is single
Member 203, phase shortage judging unit 204, storage unit 205, input unit 206, electrical parameter processing unit 207, electrical energy measurement unit
208, reclosing judging unit 209, clock unit 210 and display unit 211.
Specifically, zero sequence transformer 11 acquires the running electric leakage signal of low-voltage distribution apparatus and is sent to digital control end
Signal processing unit 202 in end, signal processing unit 202 are filtered electric leakage signal, after enhanced processing, are sent to center
Processor 201；Central processing unit 201 receives electric leakage signal, and processing analysis is carried out to electric leakage signal, when judgement meets separating brake condition
When, sending separating brake electric signal to breaker makes breaker open operation.
Current transformer 12 acquires the running current signal of low-voltage distribution apparatus and is sent in digital control terminal
Signal processing unit 202, signal processing unit 202 are filtered current signal, after enhanced processing, are sent to central processing unit
201；Central processing unit 201 receives current signal, and processing analysis is carried out to current signal, when judging to meet separating brake condition, to
Breaker, which sends separating brake electric signal, makes breaker open operation.
Voltage transformer 13 acquires the running voltage signal of low-voltage distribution apparatus and is sent in digital control terminal
Signal processing unit 202, signal processing unit 202 are filtered voltage signal, after enhanced processing, are sent to central processing unit
201；201 receiving voltage signal of central processing unit, processing analysis is carried out to voltage signal, when judging to meet separating brake condition, to
Breaker, which sends separating brake electric signal, makes breaker open operation.
It lacks zero judging unit 203 and judges whether electric signal that signal processing unit receives lacks neutral signal, and
When determination lacks neutral signal, is sent to central processing unit 201 and lack zero electric signal；Phase shortage judging unit 204 judges signal processing
Whether the electric signal that unit receives lacks phase signals, and when determination lacks phase signals, sends and lack to central processing unit 201
Phase electric signal；Central processing unit 201 sends separating brake also after receiving scarce zero electric signal and/or phase shortage electric signal, to breaker
Electric signal makes breaker open operation.
When the judgement of reclosing judging unit 209 meets reclosing condition, reclosing telecommunications is sent to central processing unit 201
Number, central processing unit 201 sends combined floodgate electric signal to breaker.
Low-voltage distribution apparatus electric leakage rated current in operation, rated current, specified electricity are inputted by input unit 206
Pressure and electric leakage latching current, and store into storage unit 205.
Electrical parameter processing unit 207 receives the electric signal sent by least one mutual inductor 1, becomes to electric signal
It presses and is filtered, and be sent to electric energy computing unit 208, electric energy computing unit 208 determines that low pressure is matched according to clock unit 210
The operation data of electric equipment, is sent to storage unit 205 and is stored and be sent to display unit 211 and shown.
Optionally, in the digital control terminal of the embodiment of the present invention 2, central processing unit 201 can be used MOTO family chips,
ARM7 or ARM9 etc., such as MC68HC908AP32 chips.
The judgement for executing combined floodgate, separating brake, reclosing and condition of self-locking is stored in middle central processing unit 201 in real time of the invention
Program specifically includes following procedure：
One, separating brake determining program include sending separating brake telecommunications to breaker when judging to meet at least one the following conditions
Number：The corresponding leakage current of the running electric leakage signal of low-voltage distribution apparatus is more than the electric leakage rated current of setting；Low-voltage distribution
The corresponding effective current of the running current signal of equipment is more than the rated current of setting；The running electric current of low-voltage distribution apparatus
The corresponding electric current of signal is more than the overload current of setting, alternatively, more than the short circuit current of setting；It is run according to low-voltage distribution apparatus
In current signal determine three-phase imbalance rate be more than setting three-phase current unbalance threshold value；In low-voltage distribution apparatus operation
The corresponding effective voltage of voltage signal be more than setting rated voltage；The running voltage signal of low-voltage distribution apparatus is corresponding
Voltage is more than the over-pressed voltage of setting or the decompression voltage less than setting；According to the running voltage signal of low-voltage distribution apparatus
Determining three-phase imbalance voltage rate is more than the imbalance of three-phase voltage threshold value of setting.
Secondly, reclosing determining program include judging to meet a period of time of the following conditions to breaker transmission reclosing telecommunications
Number：The corresponding leakage current of the running electric leakage signal of low-voltage distribution apparatus is no more than the electric leakage rated current of setting, low pressure is matched
The corresponding effective current of the running current signal of electric equipment is no more than the rated current of setting；Low-voltage distribution apparatus is running
The corresponding electric current of current signal is no more than the overload current of setting, alternatively, no more than the short circuit current of setting；According to low-voltage distribution
The three-phase imbalance rate that the running current signal of equipment determines is more than the three-phase current unbalance threshold value of setting；And low-voltage distribution
The corresponding effective voltage of the running voltage signal of equipment is no more than the rated voltage of setting；The running electricity of low-voltage distribution apparatus
The corresponding voltage of signal is pressed to be no more than the over-pressed voltage of setting or the decompression voltage not less than setting；According to low-voltage distribution apparatus
The three-phase imbalance voltage rate that running voltage signal determines is no more than the imbalance of three-phase voltage threshold value of setting.
Thirdly, self-locking determining program include sending self-locking electric signal to self-locking device when judging to meet the following conditions：Work as determination
After breaker reclosing, the corresponding leakage current of the running electric leakage signal of low-voltage distribution apparatus is more than and sets in set period of time
Fixed electric leakage latching current.
Circuit breaking protective system provided in an embodiment of the present invention includes：It is set to the mutual inductance of at least one of low-voltage distribution apparatus
Device, digital control terminal, breaker and self-locking device, mutual inductor monitor the running electric signal of low-voltage distribution apparatus, number control
When terminal processed judges that the running electric signal of low-voltage distribution apparatus meets separating brake condition, generating separating brake electric signal makes breaker hold
Row sub-switching operation, when judging to meet reclosing condition, generating combined floodgate electric signal makes breaker reclosing, when meeting condition of self-locking
When, generating self-locking electric signal makes breaker open operation and locks sub-switching operation, can be realized by digital control terminal and breaker
Intelligent power-off protection.Breaker uses the device with simple separating brake closing function, saves to low-voltage distribution system
Input.
Embodiment two
With reference to Fig. 3, a kind of power-off protection method flow chart of steps provided by Embodiment 2 of the present invention is shown, it specifically can be with
Include the following steps：
Step 302, the running electric leakage signal of low-voltage distribution apparatus for obtaining zero sequence transformer acquisition.
At least one mutual inductor is set in every low-voltage distribution apparatus, for acquiring the running electricity of low-voltage distribution apparatus
Gas signal.Zero sequence transformer is set in the present embodiment, it is main to acquire the electric leakage signal of low-voltage distribution apparatus in operation.
Zero sequence transformer sends the electric leakage signal of acquisition to the signal processing unit of digital control terminal, signal processing list
Member such as is filtered the electric leakage signal received, amplifies at the processing, will treated that electric leakage signal is sent to central processing unit, hold
Row step 304.
Step 304 judges whether electric leakage signal meets separating brake condition, if satisfied, thening follow the steps 306, otherwise terminates this
Secondary flow.
Central processing unit judges whether the electric leakage signal after filtered enhanced processing meets separating brake condition, wherein separating brake
Condition includes：The corresponding leakage current of the running electric leakage signal of low-voltage distribution apparatus is more than the electric leakage rated current of setting.
Step 306 makes breaker open operation to breaker transmission separating brake electric signal.
When central processing unit judges that electric leakage signal meets separating brake condition, separating brake electric signal is generated, and send to breaker
Separating brake electric signal makes breaker open operation.
Step 308 judges whether to meet reclosing condition, if satisfied, thening follow the steps 310, otherwise terminates this flow.
To keep the embodiment of the present invention more intelligent, the present embodiment is additionally provided with automatic the step of executing reclosing operation,
It specifically includes：Reclosing is carried out automatically after the setting time for executing sub-switching operation, and conjunction is executed automatically after 30 seconds such as after separating brake
Lock operates.
Step 310 makes breaker reclosing to breaker transmission combined floodgate electric signal.
Step 312, after determining breaker reclosing, in set period of time obtain acquired by zero sequence transformer it is low
It is press-fitted the running electric leakage signal of electric equipment.
In embodiments of the present invention, to solve the operation of continuous separating brake, combined floodgate, self-locking step is arranged in the present embodiment, specifically
Including：After determining breaker reclosing, the low-voltage distribution apparatus acquired by zero sequence transformer is obtained in set period of time
Running electric leakage signal, after breaker reclosing, the running electric leakage signal of low-voltage distribution apparatus in 5S.
Step 314 judges whether electric leakage signal meets condition of self-locking, if satisfied, thening follow the steps 316, otherwise terminates this
Secondary flow.
Condition of self-locking in embodiments of the present invention includes：It is low in set period of time after determining breaker reclosing
It is press-fitted the electric leakage latching current that the corresponding leakage current of the running electric leakage signal of electric equipment is more than setting.
Step 316 makes breaker open operation to self-locking device transmission self-locking electric signal and locks sub-switching operation.
To avoid the operation of breaker continuous separating brake, combined floodgate, when judging that electric leakage signal meets condition of self-locking, from passing through center
Processor makes breaker open operation to self-locking device transmission self-locking electric signal and locks sub-switching operation.
Power-off protection method provided in an embodiment of the present invention, the low-voltage distribution apparatus by obtaining zero sequence transformer acquisition are transported
Electric leakage signal in row；Digital control terminal judges whether electric leakage signal meets separating brake condition, if satisfied, then being sent to breaker
Separating brake electric signal makes breaker open operation；Judge whether to meet reclosing condition, if satisfied, then sending combined floodgate electric signal to breaker
Make breaker reclosing；After determining breaker reclosing, in set period of time obtain acquired by zero sequence transformer it is low
It is press-fitted the running electric leakage signal of electric equipment, judges whether electric leakage signal meets condition of self-locking, if satisfied, then being sent to self-locking device
Self-locking electric signal makes breaker open operation and locks sub-switching operation, and intelligent power-off can be realized by digital control terminal and breaker
Protection.
Embodiment three
With reference to Fig. 4, a kind of step flow chart for power-off protection method that the embodiment of the present invention three provides is shown.
In the present embodiment, at least one mutual inductor is set, for acquiring low-voltage distribution apparatus in every low-voltage distribution apparatus
Running electric signal.Setting zero sequence sensor, current transformer and voltage transformer in the present embodiment, electric signal packet
Include electric leakage signal, current signal and voltage signal.
The power-off protection method of the present embodiment can specifically include following steps：
Step 402, the running current signal of low-voltage distribution apparatus for obtaining current transformer acquisition.
It is running that the signal processing unit of digital control terminal obtains the low-voltage distribution apparatus acquired by current transformer
Current signal.
Step 404 obtains the voltage transformer acquisition running voltage signal of low-voltage distribution apparatus.
It is running that the signal processing unit of digital control terminal obtains the low-voltage distribution apparatus acquired by voltage transformer
Voltage signal.
Step 406, the running electric leakage signal of low-voltage distribution apparatus for obtaining zero sequence transformer acquisition.
It is running that the signal processing unit of digital control terminal obtains the low-voltage distribution apparatus acquired by zero sequence transformer
Electric leakage signal.
In embodiments of the present invention, in step 402, step 404 and step 406 to current signal, voltage signal and leakage
The acquisition step of electric signal can be set according to actual needs, and random order can be used to current signal, voltage signal and leakage
Electric signal is acquired, and is such as first acquired electric leakage signal, is acquired current signal and last collection voltages signal again, real to this present invention
Example is applied to be not especially limited.
Step 408 judges whether current signal, voltage signal or electric leakage signal meet separating brake condition, if satisfied, then executing
Step 408, no to then follow the steps 410.
For example, the signal processing unit of digital control terminal is filtered current signal and voltage signal, enhanced processing,
A/D conversions are carried out to current signal and voltage signal by electrical parameter processing unit again, effective current is obtained and (turns by A/D
Electric current after changing) and effective voltage (passing through the transformed voltages of A/D), the central processing unit of digital control terminal is according to effectively
Electric current and effective voltage, judge whether current signal and voltage signal meet separating brake condition.
Wherein, separating brake condition includes at least following one in embodiments of the present invention：The running electricity of low-voltage distribution apparatus
Flow the rated current that the corresponding effective current of signal is more than setting；The corresponding electric current of the running current signal of low-voltage distribution apparatus
More than the overload current of setting, alternatively, more than the short circuit current of setting；It is true according to the running current signal of low-voltage distribution apparatus
Fixed three-phase imbalance rate is more than the three-phase current unbalance threshold value of setting；The running voltage signal of low-voltage distribution apparatus corresponds to
Effective voltage be more than setting rated voltage；The corresponding voltage of the running voltage signal of low-voltage distribution apparatus is more than setting
Over-pressed voltage or decompression voltage less than setting；The three-phase determined according to the running voltage signal of low-voltage distribution apparatus is uneven
The voltage rate that weighs is more than the imbalance of three-phase voltage threshold value of setting.
The step 304 in embodiment two can be found in for the judgment step of electric leakage signal in this implementation, this is repeated no more.
In embodiments of the present invention, separating brake condition can also include：Voltage transformer acquisition voltage signal lack zero and/or
Phase shortage.Such as, when judging voltage signal phase shortage, determination meets separating brake condition；For another example when judging that voltage signal lacks zero, determine full
Sufficient separating brake condition.
Step 410 makes breaker open operation to breaker transmission separating brake electric signal.
When central processing unit judgement meets aforementioned separating brake condition, separating brake electric signal is generated, and separating brake is sent to breaker
Electric signal makes breaker open operation.
Step 412 judges whether to meet reclosing condition, if satisfied, thening follow the steps 414, otherwise terminates this flow.
Step 414 makes breaker reclosing to breaker transmission combined floodgate electric signal.
To keep the embodiment of the present invention more intelligent, the present embodiment is additionally provided with automatic the step of executing reclosing operation,
It specifically includes：Reclosing is carried out automatically after the setting time for executing sub-switching operation, and conjunction is executed automatically after 30 seconds such as after separating brake
Lock operates.
If judgement is that electric leakage signal meets separating brake condition in a step 408, need to execute step 416；Otherwise step is executed
Rapid 422.
Step 416, after determining breaker reclosing, in set period of time obtain acquired by zero sequence transformer it is low
It is press-fitted the running electric leakage signal of electric equipment.
In embodiments of the present invention, to solve the operation of continuous separating brake, combined floodgate, self-locking step is arranged in the present embodiment, specifically
Including：After determining breaker reclosing, the low-voltage distribution apparatus acquired by zero sequence transformer is obtained in set period of time
Running electric leakage signal, after breaker reclosing, the running electric leakage signal of low-voltage distribution apparatus in 5S.
Step 418 judges whether electric leakage signal meets condition of self-locking, if satisfied, thening follow the steps 420, otherwise terminates this
Secondary flow.
Condition of self-locking in embodiments of the present invention includes：It is low in set period of time after determining breaker reclosing
It is press-fitted the electric leakage latching current that the corresponding leakage current of the running electric leakage signal of electric equipment is more than setting.
Step 420 makes breaker open operation to self-locking device transmission self-locking electric signal and locks sub-switching operation.
To avoid the operation of breaker continuous separating brake, combined floodgate, when judging that electric leakage signal meets condition of self-locking, from passing through center
Processor makes breaker open operation to self-locking device transmission self-locking electric signal and locks sub-switching operation.
Step 422, the voltage signal for acquiring the current signal of current transformer acquisition and voltage transformer are according to clock
Circuit is shown.
In embodiments of the present invention, the current signal acquired in step 402 is converted into effective current.It is adopted in step 404
The voltage signal of collection is converted to effective voltage, in conjunction with the clock circuit of clock unit that low-voltage distribution apparatus is running effectively
Electric current and effective voltage are shown by display unit.
In a kind of alternative of the embodiment of the present invention, the storage unit of digital control terminal can also be by Current Mutual Inductance
The current signal of device acquisition and the voltage signal of voltage transformer acquisition are stored.
Power-off protection method provided in an embodiment of the present invention, digital control terminal are believed by the electric current acquired to mutual inductor
Number, voltage signal or electric leakage signal carry out analyzing processing, when judging to meet separating brake condition, combined floodgate electric signal is sent to breaker
Make breaker reclosing, realizes the function of intelligence open circuit.After meeting reclosing condition, executed automatically more than after setting time
Closing operation reduces the trouble of artificial reclosing, after determining breaker reclosing, is obtained in set period of time and passes through zero
There are still electric leakage signals in the low-voltage distribution apparatus operation of sequence mutual inductor acquisition, and when electric leakage signal meets condition of self-locking, number
Terminal makes breaker open operation to self-locking device transmission self-locking electric signal and locks sub-switching operation, reduces continuous separating brake, closes a floodgate and bring
Inconvenience and loss, and breaker use with simple separating brake, closing function device, save to low-voltage distribution system
The input of system.
It will be understood by those skilled in the art that in the above method of specific implementation mode of the embodiment of the present invention, each step
Serial number size do not mean that the order of the execution order, the execution of each step sequence should be determined by its function and internal logic,
Implementation process without coping with specific implementation mode of the embodiment of the present invention constitutes any restriction.
It may be noted that according to the needs of implementation, all parts/step described in the embodiment of the present invention can be split as more
The part operation of two or more components/steps or components/steps can be also combined into new component/step by multi-part/step
Suddenly, to realize the purpose of the embodiment of the present invention.
It is above-mentioned to be realized in hardware, firmware according to the method for the embodiment of the present invention, or be implemented as being storable in note
Software or computer code in recording medium (such as CD ROM, RAM, floppy disk, hard disk or magneto-optic disk), or it is implemented through net
The original storage that network is downloaded in long-range recording medium or nonvolatile machine readable media and will be stored in local recording medium
In computer code, can be stored in using all-purpose computer, application specific processor or can compile to method described here
Such software processing in journey or the recording medium of specialized hardware (such as ASIC or FPGA).It is appreciated that computer, processing
Device, microprocessor controller or programmable hardware include can store or receive software or computer code storage assembly (for example,
RAM, ROM, flash memory etc.), when the software or computer code are by computer, processor or hardware access and execute, realize
Power-off protection processing method described here.In addition, when all-purpose computer accesses at for realizing the power-off protection being shown here
When the code of reason, the execution of code by all-purpose computer be converted to by execute the power-off protection being shown here processing it is special based on
Calculation machine.
Those of ordinary skill in the art may realize that lists described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and method and step can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, depends on the specific application and design constraint of technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The range of the embodiment of the present invention.
Embodiment of above is merely to illustrate the embodiment of the present invention, and is not the limitation to the embodiment of the present invention, related skill
The those of ordinary skill in art field can also make various in the case where not departing from the spirit and scope of the embodiment of the present invention
Variation and modification, therefore all equivalent technical solutions also belong to the scope of the embodiment of the present invention, the patent of the embodiment of the present invention
Protection domain should be defined by the claims.
Claims (10)
1. a kind of circuit breaking protective system, including：It is set at least one of low-voltage distribution apparatus mutual inductor, digital control end
End, breaker and self-locking device；
Wherein, the digital control terminal receives in the low-voltage distribution apparatus operation by least one mutual inductor acquisition
Electric signal, processing analysis is carried out to the electric signal, when judge meet separating brake condition when, to the breaker send point
Lock electric signal makes the breaker open operation；
When the digital control terminal judgement meets reclosing condition, sending combined floodgate electric signal to the breaker makes described break
Think highly of combined floodgate in road；
After the breaker reclosing, when the digital control terminal judgement meets condition of self-locking, sent out to the self-locking device
It send self-locking electric signal to make the breaker open operation and locks sub-switching operation.
2. system according to claim 1, which is characterized in that the digital control terminal includes：
Central processing unit, and connect respectively with central processing unit signal processing unit, lack zero judging unit, phase shortage judge it is single
Member and reclosing judging unit；
Wherein, at least one mutual inductor is connect with the signal processing unit, and low to signal processing unit transmission
It is press-fitted the electric signal of electric equipment；
The signal processing unit is filtered the electric signal, after enhanced processing, is sent to central processing unit；In described
Central processor receives the electric signal, and processing analysis is carried out to the electric signal, when judging to meet separating brake condition, to institute
Stating breaker transmission separating brake electric signal makes the breaker open operation；
Zero judging unit that lacks judges whether electric signal that the signal processing unit receives lacks neutral signal, and
When determination lacks neutral signal, is sent to the central processing unit and lack zero electric signal；
The phase shortage judging unit judges whether the electric signal that the signal processing unit receives lacks phase signals, and true
When lacking phase signals surely, phase shortage electric signal is sent to the central processing unit；
The central processing unit sends to the breaker and divides after receiving scarce zero electric signal and/or phase shortage electric signal
Lock electric signal makes the breaker open operation；
When the reclosing judging unit judgement meets reclosing condition, combined floodgate electric signal is sent to the breaker.
3. system according to claim 2, which is characterized in that the mutual inductor includes at least following one：Zero-sequence mutual inductance
Device, current transformer and voltage transformer；
The electric signal includes at least one of：Electric leakage signal, current signal and voltage signal；
Wherein, the zero sequence transformer acquires the running electric leakage signal of the low-voltage distribution apparatus and is sent to the number control
Signal processing unit in terminal processed；
The current transformer acquires the running current signal of the low-voltage distribution apparatus and is sent to the digital control end
Signal processing unit in end；
The voltage transformer acquires the running voltage signal of the low-voltage distribution apparatus and is sent to the digital control end
Signal processing unit in end.
4. system according to claim 3, which is characterized in that the digital control terminal further includes：With central processing unit
The input unit and storage unit of connection；
Wherein, by the input unit input low-voltage distribution apparatus electric leakage rated current in operation, rated current,
Rated voltage and electric leakage latching current, and store into the storage unit.
5. system according to claim 2, which is characterized in that
The separating brake condition includes at least following one：
The corresponding leakage current of the running electric leakage signal of low-voltage distribution apparatus is more than the electric leakage rated current of setting；
The corresponding effective current of the running current signal of low-voltage distribution apparatus is more than the rated current of setting；
The corresponding electric current of the running current signal of low-voltage distribution apparatus is more than the overload current of setting, alternatively, more than setting
Fixed short circuit current；
The three-phase imbalance rate determined according to the running current signal of the low-voltage distribution apparatus is more than the three-phase current of setting
Uneven threshold value；
The corresponding effective voltage of the running voltage signal of low-voltage distribution apparatus is more than the rated voltage of setting；
The corresponding voltage of the running voltage signal of low-voltage distribution apparatus is more than the over-pressed voltage of setting or less than setting
Decompression voltage；
The three-phase imbalance voltage rate determined according to the running voltage signal of the low-voltage distribution apparatus is more than the three-phase of setting
Voltage unbalance threshold value；
The condition of self-locking includes：
After the breaker reclosing, the low-voltage distribution of the zero sequence transformer acquisition obtained in set period of time
The corresponding leakage current of the running electric leakage signal of equipment is more than the electric leakage latching current of setting.
6. system according to claim 1, which is characterized in that the digital control terminal further includes：With central processing unit
Electrical parameter processing unit, electric energy computing unit, clock unit and the display unit of connection；
Wherein, electrical parameter processing unit receives the electric signal sent by least one mutual inductor, is carried out to electric signal
It transformation and is filtered, and is sent to electric energy computing unit, electric energy computing unit determines low-voltage distribution apparatus according to clock unit
Operation data, be sent to storage unit and stored and be sent to display unit and shown.
7. a kind of power-off protection method, including：
After determining breaker reclosing, obtains in set period of time and transported by the low-voltage distribution apparatus that zero sequence transformer acquires
Electric leakage signal in row；
When judging that the electric leakage signal meets condition of self-locking, makes breaker open operation to self-locking device transmission self-locking electric signal and lock
Sub-switching operation；
Wherein, the condition of self-locking includes：After determining breaker reclosing, the low-voltage distribution apparatus in set period of time
The corresponding leakage current of running electric leakage signal is more than the electric leakage latching current of setting.
8. the method according to the description of claim 7 is characterized in that the method further includes：
Obtain the running electric leakage signal of the low-voltage distribution apparatus of zero sequence transformer acquisition；
When judge the corresponding leakage current of the running electric leakage signal of the low-voltage distribution apparatus be more than setting the specified electricity of electric leakage
When stream, sending separating brake electric signal to breaker makes the breaker open operation；
And/or
Obtain the running current signal of the low-voltage distribution apparatus of current transformer acquisition；
When judging that the corresponding effective current of the current signal is more than the rated current of setting, separating brake telecommunications is sent to breaker
Number make the breaker open operation；
And/or
It obtains voltage transformer and acquires the running voltage signal of low-voltage distribution apparatus；
When judging that the corresponding effective voltage of the running voltage signal of the low-voltage distribution apparatus is more than the rated voltage of setting,
Sending separating brake electric signal to breaker makes the breaker open operation.
9. according to the method described in claim 8, it is characterized in that,
The reclosing condition includes：More than executing closing operation automatically after setting time.
10. according to any methods of claim 7-9, which is characterized in that the method further includes：
The running voltage signal of the low-voltage distribution apparatus for obtaining voltage transformer acquisition, when judging that the voltage signal is scarce
Xiang Shi, sending separating brake electric signal to breaker makes the breaker open operation；
And/or
The running voltage signal of the low-voltage distribution apparatus for obtaining voltage transformer acquisition, when judging that the voltage signal is scarce
When zero, sending separating brake electric signal to breaker makes the breaker open operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710059497.8A CN108347038A (en) | 2017-01-24 | 2017-01-24 | A kind of power-off protection method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710059497.8A CN108347038A (en) | 2017-01-24 | 2017-01-24 | A kind of power-off protection method and system |
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| CN108347038A true CN108347038A (en) | 2018-07-31 |
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ID=62963193
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11451171B2 (en) * | 2019-06-19 | 2022-09-20 | Schneider Electric USA, Inc. | Motor branch circuit health monitoring method |
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