CN104682564B - Relay protecting and mis-operation preventing device and system - Google Patents
Relay protecting and mis-operation preventing device and system Download PDFInfo
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- CN104682564B CN104682564B CN201510114557.2A CN201510114557A CN104682564B CN 104682564 B CN104682564 B CN 104682564B CN 201510114557 A CN201510114557 A CN 201510114557A CN 104682564 B CN104682564 B CN 104682564B
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- relay protection
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- operation ticket
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- 230000004224 protection Effects 0.000 claims abstract description 147
- 238000012423 maintenance Methods 0.000 claims abstract description 27
- 238000003825 pressing Methods 0.000 claims description 33
- 238000012795 verification Methods 0.000 claims description 12
- 238000012790 confirmation Methods 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 238000007689 inspection Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000012550 audit Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Abstract
The invention relates to the field of relay protection, in particular to a relay protecting and mis-operation preventing device and system. The device comprises an acquiring module for acquiring first information of a relay protecting device, a secondary device module for determining a secondary device according to an operation task, a secondary operation order module for generating a secondary operation order or the relay protecting device in the secondary device of the secondary device module according to the first information in the acquiring module, and a sending module for sending the secondary operation order of the secondary operation order module to perform. With the adoption of the device and system, the first information of the relay protecting device can be acquired all the time; the secondary operation order can be automatically generated according to the operation task; the blank that the operation maintenance staff have no secondary operation order in the relay protection operation can be made up; the probability of mis-operation of the relay protection can be reduced.
Description
Technical field
The present invention relates to relay protection field, in particular to relay protection anti-misoperation apparatus and system.
Background technology
In relay protection, operation maintenance personnel is correct, reliably and securely operate the throwing of relay-protection pressing plate to move back, and prevents from once setting
During standby back brake, in relay protection device operation, new equipment when putting into operation etc. the leakage of work in every pressing plate throw, miscarrying, false throw etc.
Hidden trouble；Ensure that the effective definite value of relay protection is correctly operated in the definite value area of regulation, prevent false protection or tripping；
Can real-time monitoring relay protection device definite value area, effective definite value, pressing plate throw the state moved back；Secondary work people can effectively be taken precautions against
Member goes to the wrong way the protective relaying maloperation accident that interval is caused by mistake.The intelligent transformer substation computer monitoring that CN101895153 is provided is anti-error
Operating system, the measure and control device (makeup automatically of the intelligent substation being in parallel by computer monitoring anti-misoperation system and N roads
Put) composition, the intelligent substation that wherein the N roads signal output/input of computer monitoring anti-misoperation system is in parallel with N roads
In the signal input/output end correspondence of measure and control device connect；Intelligent substation anti-misoperation system includes measure and control device, button
Switch, remote control switch device, high voltage display device, secondary pressure plate and change-over switch.Although the invention can give birth to
Into accurate secondary operation ticket, but the actually executory operational error of secondary operation ticket cannot be avoided.
The content of the invention
It is an object of the invention to provide a kind of relay protection method for preventing misoperation, device, system and electron key, to solve
Certainly in relay protection maloperation problem.
A kind of relay protection anti-misoperation apparatus are embodiments provided, including：
Acquisition module, for obtaining the first information of relay protection device；
Secondary device module, for obtaining operation task and determining secondary device according to operation task；
Secondary operation ticket module, for the first information in acquisition module to secondary device module in it is secondary
Relay protection device in equipment generates secondary operation ticket；
Sending module, for the secondary operation ticket in secondary operation ticket module to be sent for performing.
In certain embodiments, preferably, described relay protection anti-misoperation apparatus also include：Open command module,
For obtaining the open command of the relay protection device of the corresponding secondary device of secondary operation ticket from secondary operation ticket module, and will
The open command is sent to electron key.
In certain embodiments, preferably, described relay protection anti-misoperation apparatus also include：Analog module, is used for
Secondary operation ticket is obtained from the secondary operation ticket module, and is simulated the relay protection result after secondary operation ticket stubs row and is deposited
Storage.
In certain embodiments, preferably, described relay protection anti-misoperation apparatus also include：Comparing module, is used for
Obtain secondary operation ticket stubs row after relay protection device the second information, and by the second information and the analog module store after
Electric protection result is checked, if confirmation, relay protection is completed；If verification is abnormal, start warning module.
In certain embodiments, preferably, described relay protection anti-misoperation apparatus also include：Pressing plate module, is in
Between the secondary device module and secondary operation ticket module, when moving back pressing plate for throwing for the operation task, selection is obtained
Pressing plate, and pressing plate explanation of compilation is provided in pressing plate is selected, and when mother is jumped and/or main transformer jumps three sides, start warning module.
In certain embodiments, preferably, described relay protection anti-misoperation apparatus also include：Selecting module, is in
Between the secondary device module and secondary operation ticket module, when adjusting for definite value for the operation task, in secondary device
It is determined that after the selection that secondary device protects type, and the selection in definite value area are provided, and obtain the secondary device protection type of selection
With definite value area.
In certain embodiments, preferably, described relay protection anti-misoperation apparatus also include：Maintenance setting module,
Between the secondary device module and secondary operation ticket module, when overhauling for secondary device for the operation task,
Secondary device obtains maintenance content after determining, and the maintenance content is passed to into secondary operation ticket module.
In certain embodiments, preferably, described relay protection anti-misoperation apparatus also include：Authority module and record
Module；The authority module is connected with the electron key of secondary device, for after secondary device determines, obtaining secondary device
Unlatching authority, and by it is described unlatching transfer of right to the electron key；The electronics key of the logging modle and secondary device
Spoon is connected, for obtaining the open record of secondary device from the electron key.
Another aspect of the present invention additionally provides a kind of relay protection anti-misoperation system to be included：Any one of claim 1-8
Described relay protection anti-misoperation apparatus, collector；The collection terminal of the collector is connected with a certain relay protection device,
Signal sending end is connected with the relay protection anti-misoperation apparatus.
In certain embodiments, preferably, relay protection anti-misoperation system also includes electron key, and it includes：
Receiver module, for from described in claim 1 relay protection anti-misoperation apparatus receive secondary device in after
Electric protection opening of device is instructed；
Opening module, formulates for the unlatching in receiver module, opens corresponding relay protection device；
Record generation module, opens or record of examination for generating relay protection device.
Relay protection anti-misoperation apparatus provided in an embodiment of the present invention and system, compared with prior art, the moment obtains
The first information of relay protection device, and secondary operation ticket is automatically generated according to operation task, make up operation maintenance personnel relay protection
Without the blank of secondary operation ticket in operation, the probability of relay protection maloperation is reduced.
Description of the drawings
The step of Fig. 1 is relay protection method for preventing misoperation in one embodiment of the invention schematic diagram；
Fig. 2 is the structural representation of relay protection anti-misoperation system in one embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Consider to be instructed because Jing often lacks secondary operation ticket in relay protection anti-misoperation up till now, cause pressing plate leakage to throw,
Miscarrying, false throwing；The effective definite value of relay protection situations such as definite value area, does not cause relay protection operation accident, the invention provides
Relay protection method for preventing misoperation, device, system and electron key.
A kind of relay protection anti-misoperation apparatus, including：Acquisition module, for obtaining the first letter of relay protection device
Breath；Secondary device module, for obtaining operation task and determining secondary device according to operation task；Secondary operation ticket module, uses
The relay protection device in the secondary device in secondary device module is generated in the first information in acquisition module secondary
Operation order；Sending module, for the secondary operation ticket in secondary operation ticket module to be sent for performing.
A kind of relay protection anti-misoperation system is additionally provided, including：Relay protection anti-misoperation apparatus, collector；
The collection terminal of collector is connected with a certain relay protection device, and signal sending end is connected with relay protection anti-misoperation apparatus.
Compared with prior art, the moment obtains the first information of relay protection device, and is automatically generated according to operation task
Secondary operation ticket, makes up in operation maintenance personnel relay protection operation without the blank of secondary operation ticket, reduces relay protection maloperation
Probability.
Describe in detail below by one embodiment,
In order to avoid there is maloperation in relay protection device operation, it is fool proof that the present invention provides a kind of relay protection
Method, the method includes, as shown in Figure 1：
Step 101, obtains the first information of relay protection device；
Due to needing to formulate generation secondary operation according to the first information and specific operation task of relay protection device
Ticket, the first information that relay protection device is obtained accurately, in time is most important.
Wherein the first information due to relay protection device be connected collector be acquired, the information include it is following arbitrary
Kind：Pressing plate throws bounce breath, the definite value of relay protection device and definite value area, secondary device maintenance.
Step 102, according to operation task secondary device is determined；
The different secondary device of different operation task correspondences.Operation task be it is many, such as：Throw by scheduling requirement
Move back pressing plate；By scheduling requirement switching definite value area；Secondary device is maked an inspection tour；Secondary device maintenance etc..
Step 103, generates secondary according to the first information of relay protection device to the relay protection device in secondary device
Operation order；
Then relay protection anti-misoperation apparatus carry out examination ＆ verification confirmation according to selecting to generate secondary operation ticket, upon
Examination ＆ verification will be in step 103.
Step 104, secondary operation ticket is sent for performing.
The sending method of secondary operation ticket can be sent by signal.
Wherein, in other specific implementation process, in order to improve the degree of accuracy of relay protection, it is to avoid operation maintenance personnel is gone to the wrong way
Interval, relay protection operation error, can also increase following steps between step 103 and step 104：
Step 105, by the relay protection device open command in secondary device electron key is sent to.
Electron key opens the screen door or terminal chamber door of corresponding relay protection device according to open command.The open command
Can be bundled in operation equipment information and pass to electron key.
On the other hand, in other specific implementation process, in order to improve the degree of accuracy of relay protection, in step 103 and
Following steps can also be increased between step 104：
Step 106, simulation is made the relay protection result after secondary operation ticket stubs row and is stored.
The relay protection result is the simulated operation in relay protection anti-misoperation apparatus, and the result of the simulated operation is more
Accurately.
Increase following steps after in order to improve the practicality of step 106, step 104：
Step 107, receives the second information of relay protection device after secondary operation ticket stubs row；
After secondary operation ticket stubs row, the information of relay protection device can be changed, and this write information is collected in time and is total to
Enjoy in relay protection anti-misoperation apparatus, compare with the simulated operation result for wherein storing, by analyses and comparison result,
Both can determine whether actual relay protection operation is correct.
Step 108, the second information and relay protection result are checked, if confirmation, relay protection is completed；If verification
It is abnormal, send warning signal.
In the relay protection method for preventing misoperation, multistage auditing is carried out to secondary operation ticket and implementation status, shut out
Absolutely relay-protection pressing plate miscarrying accident, the effective control generation of all kinds of accidents of relay protection device.Using electron key pair
Relay protection device screen door lockset is managed collectively, and has prevented protective relaying maloperation accident, and has prevented to be strayed into operation relay
What protection equipment was caused touches accident by mistake.
Relay protection anti-misoperation system is used to perform above-mentioned relay protection method for preventing misoperation, and it includes, such as Fig. 2 institutes
Show, relay protection anti-misoperation apparatus, collector, electron key etc.；Wherein collector connection corresponding with relay protection device, uses
In collection relay protection device the first information, the second information, such as：Pressing plate running status, effective definite value are run definite value area and are had
Effect definite value etc., collector is connected with relay protection anti-misoperation apparatus, the two real-time communication, by the information transfer of collection to relay
Protection anti-misoperation apparatus.Relay protection anti-misoperation apparatus real-time reception various information, and according to the software reality inside device
Existing operations task, formulates secondary operation ticket, determines relay protection device type, and is sent out to electron key by transmission equipment
Send open command.Electron key opens the shield door of designated equipment according to operation task and relay protection device and open command
Or terminal chamber door.Wherein electron key controls the open command of each relay protection device, and it can individually be protected, the electronics
Key includes：Receiver module, for receiving secondary device in relay protection device open command；Opening module, for basis
Unlatching in receiver module is formulated, and opens corresponding relay protection device；Record generation module, opens for generating relay protection device
Open or record of examination.
Wherein, relay protection anti-misoperation apparatus can be protected as an independent equipment, and it includes：
Acquisition module, for obtaining the first information of relay protection device；
Secondary device module, for obtaining operation task and determining secondary device according to operation task；
Secondary operation ticket module, for the first information in acquisition module to the secondary device in secondary device module
In relay protection device generate secondary operation ticket；
Sending module, for the secondary operation ticket in secondary operation ticket module to be sent for performing.
In order to improve the accuracy of relay protection, in other concrete structure designs, also increase：Open command module, uses
In the open command of the relay protection device that the corresponding secondary device of secondary operation ticket is obtained from secondary operation ticket module, and will open
Open instruction and be sent to electron key.
On the other hand, while improving the accuracy of relay protection, it is also possible to do following design, increase such as lower module：Simulation
Module, for obtaining secondary operation ticket from secondary operation ticket module, and simulates the knot of the relay protection after secondary operation ticket stubs row
Fruit simultaneously stores；Comparing module, for obtaining secondary operation ticket stubs row after relay protection device the second information, and by the second information
With the relay protection result verification of analog module storage, if confirmation, relay protection is completed；If verification is abnormal, start pre-
Alert module, sends warning signal.
Be given below several different operation tasks, and to should operation task specifically perform method：
Embodiment 1, operation maintenance personnel is thrown according to scheduling requirement and moves back pressing plate
Relay protection anti-misoperation apparatus simulated operation is logged in, secondary device is selected, pressing plate selects (to need special instruction
It is that explanation of compilation is carried out to each pressing plate in the operation device, solving all kinds of operation maintenance personnels cannot comprehensively grasp pressing plate work(
A difficult problem for energy；And, device carries out forced reminding also for the protections such as mother, three sides of main transformer jump are jumped, and has prevented connection and has jumped protection
Pressing plate leaks throwing accident；), relay protection anti-misoperation apparatus are generated according to the relay protection device information and operation task that obtain
Secondary operation ticket (is thrown containing pressing plate and moves back table), and the interior examination ＆ verification of device confirms, after confirmation, result is moved back in the pressing plate throwing for formulating simulation, and subpoena is beaten
Print, subpoena success, electron key opens designated equipment screen door, and operation maintenance personnel is pressed according to secondary operation ticket on secondary device
Plate is thrown and is moved back, and by operational circumstances (pressing plate throws bounce breath) return mechanism, work is completed；
Device throws setback row core according to the pressing plate that the pressing plate of collection throws bounce breath (previously mentioned second information) and simulation
After errorless, this end-of-job；If verification is abnormal, device ejects warning information and reminds operation maintenance personnel to be checked.
In the concrete performing module of the operation task design, except each module of above-mentioned relay protection anti-misoperation system
Outward, also include：Pressing plate module, between secondary device module and secondary operation ticket module, pressure is moved back for operation task for throwing
During plate, the pressing plate of selection is obtained, and pressing plate explanation of compilation is provided in pressing plate is selected, and when jump mother and/or main transformer jump three sides
When, start warning module.
Embodiment 2, operation maintenance personnel is according to scheduling requirement switching definite value area
Operation maintenance personnel logs in relay protection anti-misoperation apparatus simulated operation, selectes secondary device according to operation task, really
Locking equipment protects type, selects definite value area (system ejects definite value area and arranges regulation), and device generates secondary operation ticket, inside device
Examination ＆ verification confirms that formulate the definite value area of simulation, subpoena is printed, and subpoena success, electron key opens the screen for specifying relay protection device
Door, operation maintenance personnel is operated according to secondary operation ticket on secondary device, and by the definite value area information residing for equipment after operation (above
The second information mentioned) device is replied to, work is completed；
Device selects to carry out after confirmation according to the definite value area information of collection and the definite value area of simulation, this work knot
Beam；If verification is abnormal, device ejects warning information and reminds operation maintenance personnel to be checked.
Device real-time monitoring relay protection constant value area and effective definite value, the specification management in definite value area has prevented operation fixed
Value area and the inconsistent phenomenon of effective definite value storage area.
In the concrete performing module of the operation task design, except each module of above-mentioned relay protection anti-misoperation system
Outward, also include：Selecting module, is definite value tune for operation task between secondary device module and secondary operation ticket module
When whole, the selection that secondary device protects type, and the selection in definite value area are provided after secondary device determines, and obtain the two of selection
Secondary device protects type and definite value area.
Embodiment 3, operation maintenance personnel makes an inspection tour secondary device
Relay protection anti-misoperation apparatus are logged in, authority setting opens corresponding relay protection device screen door by electron key
(screen door is equipped with recognition type lockset), you can carry out equipment-patrolling.Equipment can be automatically generated after end-of-job by electron key to patrol
Depending on record.
In the concrete performing module of the operation task design, except each module of above-mentioned relay protection anti-misoperation system
Outward, also include：Authority module and logging modle；
Authority module is connected with the electron key of secondary device, for after secondary device determines, obtaining secondary device
Unlatching authority, and will open transfer of right to electron key；
Logging modle is connected with the electron key of secondary device, for obtaining the unlatching note of secondary device from electron key
Record.
Embodiment 4, maintainer carries out secondary device maintenance, regular inspection work
Entering device simulated operation, selectes secondary device, and input service content is (such as：Maintenance mode), system generates two
Secondary operation order (throw containing pressing plate and move back table), device internal check confirms, subpoena is printed, subpoena success, and electron key is opened to specify and set
Standby screen door), operated on secondary device according to secondary operation ticket, return mechanism；
Device automatically generates relay protection device logging, and the logging is compared with actual record of examination, audits nothing
Achieve after by mistake.
In the concrete performing module of the operation task design, except each module of above-mentioned relay protection anti-misoperation system
Outward, also include：Maintenance setting module, is two for operation task between secondary device module and secondary operation ticket module
When secondary device is overhauled, maintenance content is obtained after secondary device determines, and maintenance content is passed to into secondary operation ticket module.
Can be seen that from the various embodiments described above, the running status and real-time core pair of system real-time monitoring relay-protection pressing plate, after
Electric protection equipment-patrolling record is automatically generated with all kinds of work debugging recordings, has reached teams and groups' Reduction of Students' Study Load, the purpose cut payroll to improve efficiency
The preferred embodiments of the present invention are these are only, the present invention is not limited to, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of relay protection anti-misoperation apparatus, it is characterised in that include：
Acquisition module, for obtaining the first information of relay protection device；
Secondary device module, for obtaining operation task and determining secondary device according to operation task；
Secondary operation ticket module, for the first information in acquisition module to the secondary device in secondary device module
In relay protection device generate secondary operation ticket；
Sending module, for the secondary operation ticket in secondary operation ticket module to be sent for performing；
Analog module, for obtaining secondary operation ticket from the secondary operation ticket module, and simulates after secondary operation ticket stubs row
Relay protection result and store；
Comparing module, for obtaining secondary operation ticket stubs row after relay protection device the second information, and by the second information and institute
The relay protection result verification of analog module storage is stated, if confirmation, relay protection is completed；If verification is abnormal, start pre-
Alert module；
Also include：Open command module, for from secondary operation ticket module obtain the corresponding secondary device of secondary operation ticket after
The open command of electric protection equipment, and the open command is sent to into electron key.
2. relay protection anti-misoperation apparatus as claimed in claim 1, it is characterised in that also include：Pressing plate module, in institute
State between secondary device module and secondary operation ticket module, when moving back pressing plate for throwing for the operation task, obtain the pressure of selection
Plate, and pressing plate explanation of compilation is provided in pressing plate is selected, and when mother is jumped and/or main transformer jumps three sides, start warning module.
3. relay protection anti-misoperation apparatus as claimed in claim 1, it is characterised in that also include：Selecting module, in institute
State between secondary device module and secondary operation ticket module, it is true in secondary device when adjusting for definite value for the operation task
The selection that secondary device protects type, and the selection in definite value area be provided after fixed, and obtain selection secondary device protection type and
Definite value area.
4. relay protection anti-misoperation apparatus as claimed in claim 1, it is characterised in that also include：Maintenance setting module, place
Between the secondary device module and secondary operation ticket module, when overhauling for secondary device for the operation task, two
Secondary device obtains maintenance content after determining, and the maintenance content is passed to into secondary operation ticket module.
5. relay protection anti-misoperation apparatus as claimed in claim 1, it is characterised in that also include：Authority module and record
Module；
The authority module is connected with the electron key of secondary device, for after secondary device determines, obtaining secondary device
Unlatching authority, and by it is described unlatching transfer of right to the electron key；
The logging modle is connected with the electron key of secondary device, for obtaining opening for secondary device from the electron key
Open record.
6. a kind of relay protection anti-misoperation system, it is characterised in that include：Relay described in any one of claim 1-5 is protected
Shield anti-misoperation apparatus, collector；The collection terminal of the collector is connected with a certain relay protection device, signal sending end with
The relay protection anti-misoperation apparatus are connected.
7. relay protection anti-misoperation system as claimed in claim 6, it is characterised in that also including electron key, it includes：
Receiver module, the relay for receiving from the relay protection anti-misoperation apparatus described in claim 1 in secondary device is protected
Shield opening of device instruction；
Opening module, formulates for the unlatching in receiver module, opens corresponding relay protection device；
Record generation module, opens or record of examination for generating relay protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114557.2A CN104682564B (en) | 2015-03-16 | 2015-03-16 | Relay protecting and mis-operation preventing device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114557.2A CN104682564B (en) | 2015-03-16 | 2015-03-16 | Relay protecting and mis-operation preventing device and system |
Publications (2)
| Publication Number | Publication Date |
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| CN104682564A CN104682564A (en) | 2015-06-03 |
| CN104682564B true CN104682564B (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510114557.2A Expired - Fee Related CN104682564B (en) | 2015-03-16 | 2015-03-16 | Relay protecting and mis-operation preventing device and system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109474065A (en) * | 2018-01-31 | 2019-03-15 | 国网浙江省电力公司湖州供电公司 | A kind of anti-misoperation system and method for secondary device |
| CN108876655A (en) * | 2018-06-04 | 2018-11-23 | 国网浙江省电力有限公司温州供电公司 | A kind of power distribution network scheduling method for preventing misoperation containing micro-capacitance sensor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100485558C (en) * | 2007-12-19 | 2009-05-06 | 田一鸣 | Electrical power system safety operation intelligent monitoring device and monitoring method thereof |
| CN101895153A (en) * | 2010-07-20 | 2010-11-24 | 南京胜太迪玛斯电力系统有限公司 | Intelligent transformer substation computer monitoring anti-misoperation system |
| CN102694416A (en) * | 2011-03-23 | 2012-09-26 | 珠海优特电力科技股份有限公司 | Plate error prevention device and working method thereof |
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