CN108551154A - A kind of over-voltage protection method and device - Google Patents
A kind of over-voltage protection method and device Download PDFInfo
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- CN108551154A CN108551154A CN201810650859.5A CN201810650859A CN108551154A CN 108551154 A CN108551154 A CN 108551154A CN 201810650859 A CN201810650859 A CN 201810650859A CN 108551154 A CN108551154 A CN 108551154A
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- 230000004224 protection Effects 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001681 protective effect Effects 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 2
- 230000001771 impaired effect Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of over-voltage protection method of present invention offer and device, this method include：The instantaneous voltage of equipment to be protected is obtained in real time；Judge whether the instantaneous voltage exceeds preset range；If it is, control trip(ping) circuit cuts off the equipment to be protected.In the prior art; the overvoltage protection of electrical equipment is mainly realized by microcomputer or electromagnetic relay; since both schemes are all to judge overvoltage failure whether occurs on the related main equipment such as circuit by judging voltage effective value; so both schemes occur from overvoltage failure to the delay for sending out trip signal and generally requiring a wave period or more, this will cause the overvoltage failure on the main equipments such as circuit that cannot quickly judge.And the present invention is judged using instantaneous voltage, so that occurring to the time interval for sending out trip signal to be less than a voltage cycle from overvoltage failure, and then tripping delay when overvoltage failure occurs can be reduced, electrical equipment is reduced because of the impaired possibility of electric fault.
Description
Technical field
The present invention relates to electic protection technical field, more particularly to a kind of over-voltage protection method and device.
Background technology
The overvoltage protection of the main electrical equipments such as circuit, transformer is mainly real by microcomputer or electromagnetic relay at present
It is existing, since both schemes are all to judge whether overvoltage occurs on the related main equipment such as circuit by judging voltage effective value
Failure, so both schemes occur from overvoltage failure to the delay for sending out trip signal and generally requiring a cycle or more,
This will cause the overvoltage failure on the main equipments such as circuit that cannot quickly judge.
Therefore, how a kind of overvoltage protection scheme is provided, tripping delay when overvoltage failure occurs can be reduced, subtracted
Few electrical equipment is those skilled in the art's technical problem urgently to be resolved hurrily because of the impaired possibility of electric fault.
Invention content
In view of this, the purpose of the present invention is to provide a kind of overvoltage protection scheme, overvoltage failure hair can be reduced
Tripping delay when raw, reduces electrical equipment because of the impaired possibility of electric fault.Its concrete scheme is as follows：
On the one hand, the present invention provides a kind of over-voltage protection method, including：
The instantaneous voltage of equipment to be protected is obtained in real time；
Judge whether the instantaneous voltage exceeds preset range；
If it is, control trip(ping) circuit cuts off the equipment to be protected.
On the other hand, the present invention provides a kind of overvoltage protection, including：
Voltage acquisition module, the instantaneous voltage for obtaining equipment to be protected in real time；
Range judgment module, for judging whether the instantaneous voltage exceeds preset range；
Trip protection module controls trip(ping) circuit excision institute if exceeding preset range for the instantaneous voltage
State equipment to be protected.
Preferably,
The voltage acquisition module, including：The voltage transformer that primary side is connected with equipment to be protected, input terminal and institute
State the operational amplifier of the secondary connection of voltage transformer；
The range judgment module, including：First optocoupler, the second optocoupler；First optocoupler, second optocoupler are reversed
Parallel connection constitutes optocoupler assembly, and the input terminal of the optocoupler assembly is connect with the output end of the operational amplifier；The optocoupler is total
At input terminal connect with the first preset resistance ground connection；The first end of the output end of the optocoupler assembly connects with DC current source
It connects, second end is connected ground connection with the second preset resistance；
The trip protection module, including：Rest-set flip-flop, protective device；The ends S of the rest-set flip-flop and the optocoupler are total
At output end second end connection；The ends Q of the rest-set flip-flop are connected to the protective device.
Preferably,
The amplification factor of the operational amplifier is critical for the cut-in voltage of the optocoupler assembly and the equipment to be protected
The ratio of the secondary side voltage value of voltage transformer when failure.
Preferably,
First optocoupler, second optocoupler are linear optical coupling.
Preferably,
The ends Q of the rest-set flip-flop are also associated with warning device.
Preferably,
The voltage transformer is electromagnetic potential transformer or electronic type voltage transformer.
Preferably,
The rest-set flip-flop is the rest-set flip-flop that two nor gates are constituted.
Preferably,
The ends R of the rest-set flip-flop are connected in series in DC power supply with switch；The ends R of the rest-set flip-flop are default with third
Resistance series connection.
Preferably,
The switch is the normal switch-dividing with snap action current-limiting protection/protective parts.
The present invention provides a kind of over-voltage protection method, including：The instantaneous voltage of equipment to be protected is obtained in real time；Judge
Whether the instantaneous voltage exceeds preset range；If it is, control trip(ping) circuit cuts off the equipment to be protected.Existing
In technology, the overvoltage protection of electrical equipment is mainly realized by microcomputer or electromagnetic relay, since both schemes are all
Judge overvoltage failure whether occurs on the related main equipment such as circuit by judging voltage effective value, thus both schemes from
The generation of overvoltage failure generally requires the delay of a wave period or more to trip signal is sent out, this will cause the master such as circuit to set
Standby upper overvoltage failure cannot quickly judge.And the present invention is judged using instantaneous voltage, so that from overvoltage
Failure occur to send out trip signal time interval be less than a voltage cycle, and then can reduce overvoltage failure generation when
Tripping delay, reduce electrical equipment because of the impaired possibility of electric fault
The present invention also provides a kind of overvoltage protections, it may have above-mentioned advantageous effect, details are not described herein.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow chart for the over-voltage protection method that specific implementation mode is provided of the present invention；
The composition schematic diagram for the overvoltage protection that Fig. 2 is provided for another specific implementation mode of the invention；
The circuit composition schematic diagram for the overvoltage protection that Fig. 3 is provided for another specific implementation mode of the invention；
Fig. 4 is the operational process schematic diagram of the circuit of overvoltage protection shown in Fig. 3.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is a kind of flow chart for the over-voltage protection method that specific implementation mode is provided of the present invention.
In a kind of specific implementation mode of the present invention, the embodiment of the present invention provides a kind of over-voltage protection method, including：
S11：The instantaneous voltage of equipment to be protected is obtained in real time；
S12：Judge whether the instantaneous voltage exceeds preset range；
S13：If it is, control trip(ping) circuit cuts off the equipment to be protected.
In the prior art, the overvoltage protection of electrical equipment is mainly realized by microcomputer or electromagnetic relay, due to
Both schemes are all to judge overvoltage failure, institute whether occurs on the related main equipment such as circuit by judging voltage effective value
Occurred from overvoltage failure to the delay for sending out trip signal and generally requiring a wave period or more with both schemes, this will
Cause the overvoltage failure on the main equipments such as circuit that cannot quickly judge.
In the embodiment of the present invention, on the basis of existing technology, the instantaneous voltage of equipment to be protected can be obtained in real time,
Rather than judged using voltage effective value in the prior art, microcontroller may be used and judged, passed using voltage
Sensor is implemented to obtain the instantaneous voltage of equipment to be protected.It is of course also possible to use other hardware configurations implement the present invention
In over-voltage protection method.
It please refers to Fig.2, Fig. 3, the group for the overvoltage protection that Fig. 2 is provided for another specific implementation mode of the invention
At schematic diagram；The circuit composition schematic diagram for the overvoltage protection that Fig. 3 is provided for another specific implementation mode of the invention.
There is a kind of specific implementation mode in the present invention, the embodiment of the present invention provides a kind of overvoltage protection 200,
Including：
Voltage acquisition module 210, the instantaneous voltage for obtaining equipment to be protected in real time；
Range judgment module 220, for judging whether the instantaneous voltage exceeds preset range；
Trip protection module 230 controls trip(ping) circuit excision if exceeding preset range for the instantaneous voltage
The equipment to be protected.
Preferably,
The voltage acquisition module 210, including：The voltage transformer 211 that primary side is connected with equipment to be protected, input
The operational amplifier 212 at end and the secondary connection of the voltage transformer；
The range judgment module 220, including：First optocoupler 221, the second optocoupler 222；First optocoupler, described
Two optocoupler reverse parallel connections constitute optocoupler assembly, and the input terminal of the optocoupler assembly is connect with the output end of the operational amplifier；
The input terminal of the optocoupler assembly is connected ground connection with the first preset resistance 223；The first end of the output end of the optocoupler assembly with
DC current source connects, and second end is connected ground connection with the second preset resistance 224；The trip protection module 230, including：RS is touched
Send out device 231, protective device 232；The ends S of the rest-set flip-flop are connect with the second end of the output end of the optocoupler assembly；It is described
The ends Q of rest-set flip-flop are connected to the protective device 232.
Further, in order to enable it is luminous with protecting equipment optocoupler in failure that can start, the operation can be put
The amplification factor of big device mutual induction of voltage when being the cut-in voltage of the optocoupler assembly and the equipment to be protected critical fault
The ratio of the secondary side voltage value of device.In this way, when equipment to be protected is in failure, voltage passes ground by voltage transformer, passes through
The amplification factor amplification of operational amplifier is to as the voltage for being suitble to optocoupler to start.
Preferably, photoelectrical coupler is divided into two kinds：One kind is non-linear optocoupler, and another kind is linear optical coupling.Nonlinear optical
The current transmission characteristic curve of coupling is nonlinear, and this kind of optocoupler is suitable for the transmission of switching signal, is not suitable for transmission simulation
Amount.The current transmission characteristic curve of linear optical coupling is close to straight line, and better performances when small signal, can be carried out with linear characteristic every
From control.Common linear optical coupling is PC817A-C series.Therefore, in embodiments of the present invention, preferentially by first light
Coupling, second optocoupler are disposed as linear optical coupling.
Further, it is also associated with warning device at the ends Q of the rest-set flip-flop.The warning device can be flicker LED
Lamp or buzzer.
Preferably,
The voltage transformer is electromagnetic potential transformer or electronic type voltage transformer.Voltage transformer and transformer
It is similar, it is the instrument of the voltage on conversion line.Capacitance type potential transformer：Capacitance type potential transformer (CVT) be by
Series capacitor divides, then is depressured and is isolated, a kind of mutual induction of voltage as meter, relay protection etc. through electromagnetic transformer
Device, capacitance type potential transformer carrier frequency can also be coupled to power transmission line for long distance communication, a distant place measure, selectivity
HF protection for transmission line, remote control, telex etc..Electronic type voltage transformer is by being connected to the one of Transmission system and two times transfer device
A kind of device of a or multiple voltages or current sensor composition, to transmit the measured amount that is proportional to, supply measuring instrument,
Instrument and relay protection or control device.Therefore, electronic type voltage transformer can be used in the embodiment of the present invention.
When selecting rest-set flip-flop, the rest-set flip-flop can be set to the rest-set flip-flop of two nor gates composition.RS
Trigger is the element for constituting various other function triggers, also known as basic RS filpflop, and structure is two
Input, the output end interconnection of a NAND gate or nor gate G1, G2.The defeated of two NAND gates or nor gate G1, G2
Enter, output end interconnection, you can basic RS filpflop is constituted, for the rest-set flip-flop of two NAND gates composition.There are two defeated for it
Enter to hold R, S and two output ends Q, Q non-.Its structure is relatively simple, the RS for therefore, in the present embodiment selecting two nor gates to constitute
Trigger.
Why selection uses rest-set flip-flop, is because subsequent protective device on startup, needs a lasting letter
Number as control signal, and in the embodiment of the present invention using in real time acquisition equipment to be protected instantaneous voltage by the way of, sentence
Disconnected result may be only present in a flash, or be followed by voltage value fluctuation and periodically occur, and be unfavorable for subsequent protection
The startup of device, thus here using rest-set flip-flop come lock judgement as a result, in order to follow-up protective device startup.
It further, can be by the ends R of the rest-set flip-flop and switch in order to return to original state rest-set flip-flop
232 are connected in series in DC power supply；The ends R of the rest-set flip-flop are connected ground connection with third preset resistance 225.In overvoltage failure
After being disposed, before band protection putting equipment in service, needs hand to press FA buttons, restore rest-set flip-flop original state.Of course, it is possible to will be described
Switch 232 is set as the normal switch-dividing with snap action current-limiting protection/protective parts.
The embodiment of the present invention provides a kind of overvoltage protection, compares in the prior art, the overvoltage of electrical equipment
Protection is mainly realized by microcomputer or electromagnetic relay, since both schemes are judged by judging voltage effective value
Circuit etc. correlation main equipment on overvoltage failure whether occurs, so both schemes from overvoltage failure occur to send out tripping
Order generally requires the delay of a wave period or more, this will cause the overvoltage failure on the main equipments such as circuit cannot be quick
Judge.And the embodiment of the present invention is judged using instantaneous voltage so that from overvoltage failure occur to send out tripping
The time interval of order is less than a voltage cycle, and then can reduce tripping delay when overvoltage failure occurs, and reduces electricity
Gas equipment is because of the impaired possibility of electric fault.
Referring to FIG. 4, Fig. 4 is the operational process schematic diagram of the circuit of overvoltage protection shown in Fig. 3.
In the following, for the embodiment in Fig. 3, it is described further：
Overvoltage protection includes voltage transformer (PT), operational amplifier, the optocoupler of equipment to be protected (such as circuit)
The basic RS that IC1, optocoupler IC2, button F A, resistance R1, resistance R2, resistance R3, direct voltage source VCC, two nor gates form
Trigger.
U indicates that the primary voltage of main equipment, U ' indicate that corresponding voltage transformer secondary voltage, that is, operation are put in figure
The input voltage of big device.Uout indicates op-amp output voltage.
The input terminal of main equipment voltage transformer (CT) secondary winding and operational amplifier connects.
The light emitting diode of the output end of operational amplifier optocoupler (IC1, IC2) in parallel with two reversed polarity (headtotails)
Side and resistance R1Connection.
The phototriode side of direct voltage source VCC optocouplers (IC1, IC2) in parallel with two reversed polarity (headtotails), with
And resistance R2Connection.On the other hand, direct voltage source VCC passes through button F A and resistance R3Connection.
The ends basic RS filpflop R are connected in button F A and resistance R3Between.The ends basic RS filpflop S are connected to two reversed polarity
Between the phototriode side and resistance R2 of (headtotail) parallel connection optocoupler (IC1, IC2).
Its operation principle is as follows：
If assuming：(1) voltage transformer pt secondary winding instantaneous voltage absolute value when main equipment is without overvoltage failure and
It is u to have cut off value when overvoltage failureset；(2) light emitting diode cut-in voltage UTHIt has determined that.Then op-amp gain A
Meet lower relation of plane, the system of this programme design can be achieved with quick overvoltage protection.
A*uset=UTH
When main equipment normal operation, voltage transformer pt secondary winding instantaneous voltage absolute value | U (t) | it is consistently less than uset,
Then
A*|U(t)|<UTH
Light emitting diode does not shine in i.e. at this time optocoupler IC1 and IC2, phototriode cut-off.It is triggered according to basic RS
The basic principle of device is it is found that basic RS filpflop will not act at this time, that is to say, that the Q outputs of its output end are 0 (low level).
When overvoltage failure occurs for main equipment, the absolute value of voltage transformer pt secondary winding instantaneous voltage can be quick
Increase, | U (t) | within the extremely short time can be more than cut off value uset, the voltage at light emitting diode both ends is fast in optocoupler IC1 or IC2
Speed is more than cut-in voltage UTH, light emitting diode is bright in IC1 or IC2, corresponding photosensitive triode ON, resistance R2The voltage of upper end becomes
High level, that is to say, that basic RS filpflop input terminal S becomes high level.According to the principle of basic RS filpflop it is found that it is exported
End Q can export high level signal and keep.Trigger output end Q can be connected to the trip(ping) circuit of main equipment relative breaker, allow master
Equipment trips rapidly when overvoltage failure occurs, and failure is made quickly to cut.Meanwhile output end Q can also be with measure and control device with cooperation
For alarming from the background, allows power grid operation personnel to know and overvoltage failure occurs.
After overvoltage troubleshooting, before main equipment puts into operation, hand is needed to press FA buttons, restores rest-set flip-flop original state.
The response time of above-mentioned apparatus is mainly made of three parts：It is the transmission delay of amplifier, the transmission delay of optocoupler, basic
The actuation time of rest-set flip-flop.Time all very littles per each section, up to millisecond or nanosecond, total time is for electric system
For can be neglected.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only that
A little elements, but also include other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
A kind of over-voltage protection method provided by the present invention and device are described in detail above, it is used herein
Principle and implementation of the present invention are described for specific case, and the explanation of above example is only intended to help to understand
The method and its core concept of the present invention；Meanwhile for those of ordinary skill in the art, according to the thought of the present invention, having
There will be changes in body embodiment and application range, in conclusion the content of the present specification should not be construed as to the present invention
Limitation.
Claims (10)
1. a kind of over-voltage protection method, which is characterized in that including：
The instantaneous voltage of equipment to be protected is obtained in real time；
Judge whether the instantaneous voltage exceeds preset range；
If it is, control trip(ping) circuit cuts off the equipment to be protected.
2. a kind of overvoltage protection, which is characterized in that including：
Voltage acquisition module, the instantaneous voltage for obtaining equipment to be protected in real time；
Range judgment module, for judging whether the instantaneous voltage exceeds preset range；
Trip protection module is controlled and is waited for described in trip(ping) circuit excision if exceeding preset range for the instantaneous voltage
Protect equipment.
3. overvoltage protection according to claim 2, which is characterized in that
The voltage acquisition module, including：The voltage transformer that primary side is connected with equipment to be protected, input terminal and the electricity
Press the operational amplifier of the secondary connection of mutual inductor；
The range judgment module, including：First optocoupler, the second optocoupler；First optocoupler, the second optocoupler reverse parallel connection
Optocoupler assembly is constituted, the input terminal of the optocoupler assembly is connect with the output end of the operational amplifier；The optocoupler assembly
Input terminal is connected ground connection with the first preset resistance；The first end of the output end of the optocoupler assembly is connect with DC current source, the
Two ends are connected ground connection with the second preset resistance；
The trip protection module, including：Rest-set flip-flop, protective device；The ends S of the rest-set flip-flop and the optocoupler assembly
The second end of output end connects；The ends Q of the rest-set flip-flop are connected to the protective device.
4. overvoltage protection according to claim 3, which is characterized in that
The amplification factor of the operational amplifier is the cut-in voltage of the optocoupler assembly and the equipment to be protected critical fault
The ratio of the secondary side voltage value of Shi Suoshu voltage transformers.
5. overvoltage protection according to claim 3, which is characterized in that
First optocoupler, second optocoupler are linear optical coupling.
6. overvoltage protection according to claim 3, which is characterized in that
The ends Q of the rest-set flip-flop are also associated with warning device.
7. overvoltage protection according to claim 3, which is characterized in that
The voltage transformer is electromagnetic potential transformer or electronic type voltage transformer.
8. overvoltage protection according to claim 3, which is characterized in that
The rest-set flip-flop is the rest-set flip-flop that two nor gates are constituted.
9. according to claim 3 to 8 any one of them overvoltage protection, which is characterized in that
The ends R of the rest-set flip-flop are connected in series in DC power supply with switch；The ends R of the rest-set flip-flop and third preset resistance
Series connection ground connection.
10. overvoltage protection according to claim 9, which is characterized in that
The switch is the normal switch-dividing with snap action current-limiting protection/protective parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810650859.5A CN108551154A (en) | 2018-06-22 | 2018-06-22 | A kind of over-voltage protection method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810650859.5A CN108551154A (en) | 2018-06-22 | 2018-06-22 | A kind of over-voltage protection method and device |
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| CN108551154A true CN108551154A (en) | 2018-09-18 |
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| CN201810650859.5A Pending CN108551154A (en) | 2018-06-22 | 2018-06-22 | A kind of over-voltage protection method and device |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254846A (en) * | 1998-11-24 | 2000-05-31 | 湖南省电力试验研究所 | Automatic tracking, monitoring and compensating device for secondary line voltage drop of voltage mutual inductor |
| CN202025055U (en) * | 2011-02-10 | 2011-11-02 | 刘志学 | Grounding short circuit fault instantaneous monitoring system for circuit breaker |
| CN202550496U (en) * | 2012-03-29 | 2012-11-21 | 河北德普电器有限公司 | Individual unit DC (Direct Current) stage differential device |
| CN103618285A (en) * | 2013-12-06 | 2014-03-05 | 悉雅特万科思自动化(杭州)有限公司 | Over-current over-voltage protection circuit for 4-20mA current input circuit |
| US20150109077A1 (en) * | 2012-06-20 | 2015-04-23 | Wendell E. Tomimbang | Apparatus, System And Method For Total Protection From Electrical Faults |
| CN107017604A (en) * | 2017-04-13 | 2017-08-04 | 南京南瑞继保电气有限公司 | A kind of overvoltage protection voltage transformer disconnection faulty action preventing method |
| CN208820450U (en) * | 2018-06-22 | 2019-05-03 | 南方电网科学研究院有限责任公司 | A kind of overvoltage protection |
-
2018
- 2018-06-22 CN CN201810650859.5A patent/CN108551154A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254846A (en) * | 1998-11-24 | 2000-05-31 | 湖南省电力试验研究所 | Automatic tracking, monitoring and compensating device for secondary line voltage drop of voltage mutual inductor |
| CN202025055U (en) * | 2011-02-10 | 2011-11-02 | 刘志学 | Grounding short circuit fault instantaneous monitoring system for circuit breaker |
| CN202550496U (en) * | 2012-03-29 | 2012-11-21 | 河北德普电器有限公司 | Individual unit DC (Direct Current) stage differential device |
| US20150109077A1 (en) * | 2012-06-20 | 2015-04-23 | Wendell E. Tomimbang | Apparatus, System And Method For Total Protection From Electrical Faults |
| CN103618285A (en) * | 2013-12-06 | 2014-03-05 | 悉雅特万科思自动化(杭州)有限公司 | Over-current over-voltage protection circuit for 4-20mA current input circuit |
| CN107017604A (en) * | 2017-04-13 | 2017-08-04 | 南京南瑞继保电气有限公司 | A kind of overvoltage protection voltage transformer disconnection faulty action preventing method |
| CN208820450U (en) * | 2018-06-22 | 2019-05-03 | 南方电网科学研究院有限责任公司 | A kind of overvoltage protection |
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