CN106093494A - A kind of signal for electronic mutual inductor protects filter circuit - Google Patents
A kind of signal for electronic mutual inductor protects filter circuit Download PDFInfo
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- CN106093494A CN106093494A CN201610700924.1A CN201610700924A CN106093494A CN 106093494 A CN106093494 A CN 106093494A CN 201610700924 A CN201610700924 A CN 201610700924A CN 106093494 A CN106093494 A CN 106093494A
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- signal
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- discharge tube
- gas
- suppression diode
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a kind of signal for electronic mutual inductor and protect filter circuit, it includes two signal input parts and two signal output parts, connect between two signal input parts and two signal output parts and have protection circuit and filter circuit, wherein, protection circuit includes in gas discharge tube module, varistor module and Transient Suppression Diode module any one or the combination in any of these three, is of coupled connections by resistance or inductance between gas discharge tube module, varistor module and Transient Suppression Diode module.Overvoltage in power system, overcurrent, common mode disturbances, differential mode interference are all had inhibitory action, and circuit structure is simple, protective capacities is strong, frequency response characteristic is good, affect little on electronic mutual inductor precision.
Description
Technical field
The present invention relates to technical field of electric power, be specifically related to a kind of signal for electronic mutual inductor and protect filtered electrical
Road.
Background technology
Electronic mutual inductor, as the important component part of digital transformer substation, is the guarantor of power system safety and stability operation
Card.Owing to electronic mutual inductor is arranged near high pressure primary equipment, and its harvester employs substantial amounts of electronic devices and components,
Therefore it is particularly susceptible to the interference of bad electromagnetic environment, causes the abnormal output of electronic mutual inductor or damage.Electronic type is mutual
One of interference source of sensor is signal port, it is therefore necessary to the signal port of electronic mutual inductor is protected and filtered.
In common signal acquiring system, owing to the electromagnetic environment of device work is comparatively safe reliably, its signal circuit
Often increase a Transient Suppression Diode in porch and can meet design requirement, but its degree of protection is relatively weak, full
The foot the most not application scenario of electronic mutual inductor.In existing protection filtering technique, shocking preventing technology and EMC filtering technique phase
To maturation, although protective capacities is strong, but is commonly used to the application scenarios such as spark gap design, power filter, does not have for electricity
The signal protection of minor transformer is specialized in, and therefore safeguard procedures do not account for the circuit impact on precision, cause electricity
The problems such as minor transformer precision is overproof, frequency response characteristic is bad.
Summary of the invention
The technical problem to be solved in the present invention is, in view of the foregoing defects the prior art has, it is provided that a kind of for electricity
The signal protection filter circuit of minor transformer, equal to the overvoltage in power system, overcurrent, common mode disturbances, differential mode interference
Having inhibitory action, circuit structure is simple, protective capacities is strong, frequency response characteristic is good, affect little on electronic mutual inductor precision.
The present invention solves that above-mentioned technical problem be the technical scheme is that
A kind of signal for electronic mutual inductor protects filter circuit, and it includes two signal input parts and two signals
Outfan, connects between two signal input parts and two signal output parts and has protection circuit and filter circuit, wherein, and protection electricity
Road includes in gas discharge tube module, varistor module and Transient Suppression Diode module any of any one or these three
Combination, carries out coupling by resistance or inductance between gas discharge tube module, varistor module and Transient Suppression Diode module
Close and connect.
Connecing technique scheme, gas discharge tube module includes gas-discharge tube GDT1, gas-discharge tube GDT2Put with gas
Fulgurite GDT3, gas-discharge tube GDT1Two ends connect two signal input parts, gas-discharge tube GDT respectively2One end and signal
Input anode connects, gas-discharge tube GDT2The other end and gas-discharge tube GDT3One end connect and ground connection, gas discharge
Pipe GDT3The other end be connected with signal input part negative pole.
Connecing technique scheme, varistor module includes varistor MOV1, varistor MOV2And varistor
MOV3, varistor MOV1Two ends connect two signal input parts, varistor MOV respectively2One end and signal input part just
Pole connects, varistor MOV2The other end and varistor MOV3One end connect and ground connection, varistor MOV3The other end
It is connected with signal input part negative pole.
Connecing technique scheme, Transient Suppression Diode module includes Transient Suppression Diode TVS1, transient state suppress two poles
Pipe TVS2With Transient Suppression Diode TVS3, Transient Suppression Diode TVS1Two ends connect two signal output parts, transient state respectively
Suppression diode TVS2One end be connected with signal output part positive pole, Transient Suppression Diode TVS2The other end and transient state suppress
Diode TVS3One end connect and ground connection, Transient Suppression Diode TVS3The other end be connected with signal output part negative pole.
Connecing technique scheme, filter circuit includes Y capacitance module, X capacitance module and common mode inductance LCIn any one
Individual or the combination in any of 3.
Connecing technique scheme, Y capacitance module includes electric capacity CY1With electric capacity CY2, electric capacity CY1One end and signal input part
Positive pole connects, electric capacity CY1The other end and electric capacity CY2One end connect and ground connection, electric capacity CY2The other end and signal input part bear
Pole connects.
Connecing technique scheme, X capacitance module includes electric capacity CX, electric capacity CXTwo ends respectively with two signal input parts even
Connect.
Meet technique scheme, common mode inductance LCTwo inputs input with two signals respectively be connected, common mode
Inductance LCTwo outfans outfan with two signals respectively be connected.
The method have the advantages that
Protection circuit is used for releasing and disturbs electric current and for by output voltage clamper within the limits prescribed, does according to outside
Disturb size and rear class application demand, gas discharge tube module, varistor module and Transient Suppression Diode module are selected
Selecting combination, can form multistage protection, interference is also suppressed by filter circuit, to the overvoltage in power system, overcurrent, is total to
Mould interference, differential mode interference all have inhibitory action, and circuit structure is simple, protective capacities is strong, frequency response characteristic is good, mutual to electronic type
The advantages such as the impact of sensor precision is little.
Accompanying drawing explanation
Fig. 1 be in the embodiment of the present invention for electronic mutual inductor signal protect filter circuit schematic diagram；
Fig. 2 is the Bode diagram of the signal protection filter circuit described in the embodiment of the present invention；
Detailed description of the invention
The present invention is described in detail with embodiment below in conjunction with the accompanying drawings.
With reference to shown in Fig. 1～Fig. 2, the signal for electronic mutual inductor in the embodiment that the present invention provides protects
Filter circuit, it is characterised in that it includes two signal input parts and two signal output parts, two signal input parts and two
Connecting between signal output part has protection circuit and filter circuit, protection circuit and filter circuit to be parallel to signal input part and letter
Between number outfan, wherein, protection circuit includes gas discharge tube module, varistor module and Transient Suppression Diode module
In any one or the combination in any of these three, gas discharge tube module, varistor module and Transient Suppression Diode module
Between be of coupled connections by resistance or inductance；Protection circuit is used for releasing and disturbs electric current and for output voltage clamper being existed
In the range of regulation, according to external disturbance size and rear class application demand, to gas discharge tube module, varistor module and wink
State suppression diode (led) module carries out selecting combination, can form multistage protection, and interference is also suppressed by filter circuit, to power train
Overvoltage in system, overcurrent, common mode disturbances, differential mode interference all have inhibitory action, circuit structure is simple, protective capacities by force, frequently
Rate response characteristic is good, electronic mutual inductor precision is affected the advantages such as little.
Further, the input of described signal protection filter circuit is connected with the outfan of primary transducer, it is thus achieved that
The output analog voltage signal of sensing unit, primary transducer includes that low-power consumption iron-core coil, Luo-coil and electric capacity divide
Pressure ring, the input of described signal protection filter circuit；The outfan of described signal protection filter circuit is mutual with electronic type
Sensor harvester connects, and provides an analog quantity output signals for harvester, and this analogue signal is adjusted by harvester
Reason, AD conversion are that digital signal exports.
Further, protection circuit includes gas discharge tube module, varistor module and Transient Suppression Diode module,
Gas discharge tube module, varistor module and Transient Suppression Diode are set in turn between input and outfan, it is achieved
Three grades of protection, according to through-current capability and the difference of response time of three grades of protection, gas discharge tube module is first order protection, lets out
Amplifier section interference electric current, varistor module is second level protection, the interference electric current releasing unnecessary, Transient Suppression Diode mould
Block is third level protection, by output voltage clamper in the scope of regulation, is entered by resistance or inductance between three grades of protection modules
Row is of coupled connections, it is achieved size of successively releasing with energy movement time.
Further, gas discharge tube module includes gas-discharge tube GDT1, gas-discharge tube GDT2And gas-discharge tube
GDT3, gas-discharge tube GDT1Two ends connect two signal input parts, gas-discharge tube GDT respectively2One end and signal input
Rectify pole to connect, gas-discharge tube GDT2The other end and gas-discharge tube GDT3One end connect and ground connection, gas-discharge tube
GDT3The other end be connected with signal input part negative pole；Gas-discharge tube GDT1For differential mode interference of releasing, gas-discharge tube GDT2
With gas-discharge tube GDT3For common mode disturbances of releasing.
Further, varistor module includes varistor MOV1, varistor MOV2With varistor MOV3, pressure-sensitive
Resistance MOV1Two ends connect two signal input parts, varistor MOV respectively2One end be connected with signal input part positive pole, pressure
Quick resistance MOV2The other end and varistor MOV3One end connect and ground connection, varistor MOV3The other end defeated with signal
Enter and hold negative pole to connect；Varistor MOV1For differential mode interference of releasing, varistor MOV2With varistor MOV3For releasing altogether
Mould disturbs.
Further, Transient Suppression Diode module includes Transient Suppression Diode TVS1, Transient Suppression Diode TVS2With
Transient Suppression Diode TVS3, Transient Suppression Diode TVS1Two ends connect two signal output parts respectively, transient state suppresses two poles
Pipe TVS2One end be connected with signal output part positive pole, Transient Suppression Diode TVS2The other end and Transient Suppression Diode
TVS3One end connect and ground connection, Transient Suppression Diode TVS3The other end be connected with signal output part negative pole；For exporting
Voltage clamp is in the scope of regulation.
Further, filter circuit includes Y capacitance module, X capacitance module and common mode inductance LCIn any one or three
Individual combination in any；Y capacitance module is consistent with the operation principle of X capacitance module, is all the Low ESR utilizing electric capacity when high frequency
Characteristic so that high-frequency interferencing signal short circuit, and low-frequency channel is unaffected, wherein, logical between Y capacitance module and X capacitance module
Oversampling circuit or inductance are of coupled connections, the two ends of Y capacitance module or X capacitance module and common mode inductance LCTwo inputs even
Connect.
Further, Y capacitance module includes electric capacity CY1With electric capacity CY2, electric capacity CY1One end and signal input part positive pole even
Connect, electric capacity CY1The other end and electric capacity CY2One end connect and ground connection, electric capacity CY2The other end and signal input part negative pole even
Connect；The common mode disturbances of signal is filtered by Y capacitance module.
Further, X capacitance module includes electric capacity CX, electric capacity CXTwo ends be connected with two signal input parts respectively；X electricity
Molar block is for being filtered the differential mode interference of signal.
Further, common mode inductance LCTwo inputs input with two signals respectively be connected, common mode inductance LC's
Two outfans outfan with two signals respectively is connected；The operation principle of common mode inductance is, when the normal current in circuit
When flowing through common mode inductance, electric current produces reverse magnetic field in the inductance coil of same phase coiling and cancels out each other, when there being common mode
During electric current flowing through coil, magnetic field in the same direction can be produced in coil and increase the induction reactance of coil, with this attenuation common-mode electric current, suppression
Common mode disturbances.
In one embodiment of the present of invention, the operation principle of the present invention:
The schematic diagram of the signal protection filter circuit of the present invention, as it is shown in figure 1, it is by gas-discharge tube, varistor, wink
State suppression diode three grades of protection circuits of composition, and the filter circuit composition of Y capacitance, X electric capacity, common mode inductance composition.
First order protective device uses gas-discharge tube, is used for major part interference electric current of releasing.Gas-discharge tube GDT1's
Two ends connect between the signals, for the differential mode mode of connection, are used for suppressing differential mode interference.Gas-discharge tube GDT2Two ends be connected to
Signal forward end and safely between, gas-discharge tube GDT3Two ends be connected to signal negative end and safely between, gas
Discharge tube GDT2And GDT3The composition common mode mode of connection, is used for suppressing common mode disturbances.Described gas-discharge tube can use 2RP075L-
8, its dc breakdown voltage is 75V, impact tolerance electric current is 20kA, inter-stage electric capacity is 1.5pF, and described gas-discharge tube model is also
It is not used to limit the present invention.
Y capacitance is mainly used in being filtered high frequency common mode interference.Y capacitance CY1Two ends be connected to signal forward end and peace
Between entirely, Y capacitance CY2Two ends be connected to signal negative end and safely between, Y capacitance CY1And CY2Composition common mode wiring side
Formula, for being filtered common mode disturbances.Described Y capacitance can use Y1 safety voltage level, and capacitance may select 4700pF, institute
State Y capacitance parameter and be not used to limit the present invention.
By resistance or inductance between first order protective device gas-discharge tube and second level protective device varistor
Be of coupled connections, in order to realize gas-discharge tube release major part interference electric current, the interference electric current that varistor is released unnecessary.
Resistance R1It is serially connected in signal forward end, resistance R2It is serially connected in signal negative end, or inductance L1It is serially connected in signal forward end, inductance
L2It is serially connected in signal negative end.Described resistance or inductance can use resistance to be 300 Ω, power is 2W, precision is the electricity of 0.1%
Resistance, described resistance parameter also is not used to limit the present invention.
Second level protective device uses varistor, for the interference electric current releasing unnecessary.Varistor MOV1Two ends
Connect between the signals, for the differential mode mode of connection, be used for suppressing differential mode interference.Varistor MOV2Two ends be just connected to signal
Xiang Duanyu safely between, varistor MOV3Two ends be connected to signal negative end and safely between, varistor MOV2With
MOV3The composition common mode mode of connection, is used for suppressing common mode disturbances.Described varistor can use S10K50, and its nominal voltage is
50V, discharge capacity are 2.5kA, inter-stage electric capacity is 950pF, and described varistor model is not in order to limit the present invention.
X electric capacity is for being filtered high frequency differential mode interference.X electric capacity CXTwo ends connect between the signals, connect for differential mode
Line mode, for being filtered differential mode interference.Described X electric capacity can use X2 safety voltage level, capacitance to may select 10nF,
Described X capacitance parameter also is not used to limit the present invention.
Common mode inductance is for being filtered common-mode interference current.Common mode inductance LCConcatenate between the signals, in order to decay
Common mode current, suppresses common mode disturbances.Described common mode inductance can be selected for 744221 models of WE producer, its inductance value be 2000uH,
Rated operational current is 0.6A, and described common mode inductance signal also is not used to limit the present invention.
Between second level protective device varistor and third level protective device Transient Suppression Diode by resistance or
Inductance is of coupled connections.Resistance R3It is serially connected in signal forward end, resistance R4It is serially connected in signal negative end, or inductance L3Concatenation
At signal forward end, inductance L4It is serially connected in signal negative end.Described resistance or inductance can use resistance to be 10 Ω, power is
0.25W, precision are the resistance of 0.1%, and described resistance parameter also is not used to limit the present invention.
Third level protective device uses Transient Suppression Diode, is used for interference voltage clamper in the voltage range specified
In.Transient Suppression Diode TVS1Two ends connect between the signals, for the differential mode mode of connection, be used for suppressing differential mode interference.Wink
State suppression diode TVS2Two ends be connected to signal forward end and safely between, Transient Suppression Diode TVS3Two ends even
Be connected on signal negative end and safely between, Transient Suppression Diode TVS2And TVS3The composition common mode mode of connection, is used for suppressing altogether
Mould disturbs.Described Transient Suppression Diode can use SMBJ15CA, and its peak-inverse voltage is 15V, maximum clamp voltage is
24.4V, peak pulse power are 600W, inter-stage electric capacity is 1000pF, and described Transient Suppression Diode model also is not used to limit
The present invention.
According to the signal described in the embodiment of the present invention protect in filter circuit schematic diagram and embodiment device model used and
Parameter, the Bode diagram of protracting circuit, as shown in Figure 2.Described device parameters, frequency, Bode diagram are not intended to limit the present invention.
Electronic mutual inductor gathers the voltage and current signal of electrical network, and mains frequency is 50Hz at home；As in figure 2 it is shown,
From Bode diagram it can be seen that when 50Hz, the impact of this circuit contrast differences about-0.000165dB, about 0.002%, right
The impact of difference is about-0.204 °, about-12 '.Circuit is little on precision impact, and on the one hand this impact is fixed value, can mark
Periodical repair just, on the other hand, when ambient temperature change cause device parameters change time, due to this circuit on precision affect little,
So the variable quantity of electronic mutual inductor precision is little.The additionally signal protection filtering from Bode diagram it can be seen that in embodiment
The system frequency response characteristics of circuit is good, and when mains frequency fluctuates near 50Hz, frequency change is little on system accuracy impact, and
Can be seen that from Bode diagram, the cut-off frequency of system is 20kHz.
Further, in specific embodiment one, described signal protection filter circuit, it include two signal input parts and
Two signal output parts, it also includes gas-discharge tube GDT1, gas-discharge tube GDT2, gas-discharge tube GDT3, electric capacity CY1, electricity
Hold CY2, varistor MOV1, varistor MOV2, varistor MOV3, electric capacity CX, common mode inductance LC, Transient Suppression Diode
TVS1, Transient Suppression Diode TVS2, Transient Suppression Diode TVS3。
Gas-discharge tube GDT1One end and signal input part positive pole, gas-discharge tube GDT2One end, electric capacity CY1One
End and resistance R1(or inductance L1) one end connect, gas-discharge tube GDT1The other end and signal input part negative pole, gas discharge
Pipe GDT3One end, electric capacity CY2One end and resistance R2(or inductance L2) one end connect, gas-discharge tube GDT2The other end with
Gas-discharge tube GDT3The other end connect and ground connection, electric capacity CY1The other end and electric capacity CY2The other end connect and ground connection, electricity
Resistance R1(or inductance L1) the other end and varistor MOV1One end, varistor MOV2One end, electric capacity CXOne end and altogether
Mould inductance LCInput connect, resistance R2(or inductance L2) the other end and varistor MOV1The other end, pressure-sensitive electricity
Resistance MOV3One end, electric capacity CXThe other end and common mode inductance LCAnother input connect, varistor MOV2The other end
With varistor MOV3The other end connect and ground connection, common mode inductance LCTwo outfans respectively with resistance R3(or inductance L3)
One end and resistance R4(or inductance L4) one end connect, resistance R3(or inductance L3) the other end and Transient Suppression Diode TVS1
One end, Transient Suppression Diode TVS2One end and signal output cathode connect, resistance R4(or inductance L4) the other end and wink
State suppression diode TVS1The other end, Transient Suppression Diode TVS3One end and signal output negative pole connect, transient state suppression two
Pole pipe TVS2The other end and Transient Suppression Diode TVS3The other end connect and ground connection.
In sum, the signal protection filter circuit frequency characteristic of the present invention is good, and cut-off frequency is about kilohertz, this
Circuit is little on the impact of electronic mutual inductor precision, also can meet when the outside environmental elements such as variations in temperature and frequency fluctuation changes
Required precision.
The above presently preferred embodiments of the present invention that is only, can not limit the interest field of the present invention with this certainly,
Therefore the equivalence change made according to scope of the present invention patent, still belongs to protection scope of the present invention.
Claims (8)
1. the signal protection filter circuit for electronic mutual inductor, it is characterised in that it includes two signal input parts
With two signal output parts, connect between two signal input parts and two signal output parts and have protection circuit and filter circuit,
Wherein, during protection circuit includes gas discharge tube module, varistor module and Transient Suppression Diode module any one or
The combination in any of these three, passes through resistance between gas discharge tube module, varistor module and Transient Suppression Diode module
Or inductance is of coupled connections.
Signal for electronic mutual inductor the most according to claim 1 protects filter circuit, it is characterised in that gas is put
Fulgurite module includes gas-discharge tube GDT1, gas-discharge tube GDT2With gas-discharge tube GDT3, gas-discharge tube GDT1Two ends
Connect two signal input parts, gas-discharge tube GDT respectively2One end be connected with signal input part positive pole, gas-discharge tube GDT2
The other end and gas-discharge tube GDT3One end connect and ground connection, gas-discharge tube GDT3The other end and signal input part bear
Pole connects.
Signal for electronic mutual inductor the most according to claim 1 protects filter circuit, it is characterised in that pressure-sensitive electricity
Resistance module includes varistor MOV1, varistor MOV2With varistor MOV3, varistor MOV1Two ends connect two respectively
Individual signal input part, varistor MOV2One end be connected with signal input part positive pole, varistor MOV2The other end with pressure-sensitive
Resistance MOV3One end connect and ground connection, varistor MOV3The other end be connected with signal input part negative pole.
Signal for electronic mutual inductor the most according to claim 1 protects filter circuit, it is characterised in that transient state presses down
Diode (led) module processed includes Transient Suppression Diode TVS1, Transient Suppression Diode TVS2With Transient Suppression Diode TVS3, transient state
Suppression diode TVS1Two ends connect two signal output parts, Transient Suppression Diode TVS respectively2One end and signal export
Rectify pole to connect, Transient Suppression Diode TVS2The other end and Transient Suppression Diode TVS3One end connect and ground connection, transient state
Suppression diode TVS3The other end be connected with signal output part negative pole.
Signal for electronic mutual inductor the most according to claim 1 protects filter circuit, it is characterised in that filtered electrical
Road includes Y capacitance module, X capacitance module and common mode inductance LCIn any one or the combination in any of three.
Signal for electronic mutual inductor the most according to claim 5 protects filter circuit, it is characterised in that Y capacitance
Module includes electric capacity CY1With electric capacity CY2, electric capacity CY1One end be connected with signal input part positive pole, electric capacity CY1The other end and electric capacity
CY2One end connect and ground connection, electric capacity CY2The other end be connected with signal input part negative pole.
Signal for electronic mutual inductor the most according to claim 5 protects filter circuit, it is characterised in that X electric capacity
Module includes electric capacity CX, electric capacity CXTwo ends be connected with two signal input parts respectively.
Signal for electronic mutual inductor the most according to claim 5 protects filter circuit, it is characterised in that common mode electricity
Sense LCTwo inputs input with two signals respectively be connected, common mode inductance LCTwo outfans respectively with two letters
Number outfan connect.
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| CN201610700924.1A CN106093494A (en) | 2016-08-22 | 2016-08-22 | A kind of signal for electronic mutual inductor protects filter circuit |
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| CN106849628A (en) * | 2017-01-23 | 2017-06-13 | 中国人民解放军61489部队 | A kind of high-power electromagnetic pulse protection module for power line |
| CN108242803A (en) * | 2016-12-23 | 2018-07-03 | 上海朝辉压力仪器有限公司 | Pressure transmitter circuit |
| CN109617036A (en) * | 2019-01-15 | 2019-04-12 | 西安微电子技术研究所 | A kind of differential interface protection circuit communicated suitable for RS422 or RS485 |
| CN109755011A (en) * | 2018-11-30 | 2019-05-14 | 山东电工电气集团新能科技有限公司 | The adjustable more protection electronic current mutual inductors of secondary voltage signal |
| CN109932619A (en) * | 2019-04-15 | 2019-06-25 | 长园深瑞继保自动化有限公司 | Power distribution network electronic sensor secondary singal collector |
| CN110429565A (en) * | 2019-08-21 | 2019-11-08 | 南京大全自动化科技有限公司 | A kind of protection circuit of capacitance-voltage-distributing type electronic type voltage transformer |
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| CN112510667A (en) * | 2020-11-12 | 2021-03-16 | 熊秀 | Electromagnetic pulse protection circuit and equipment |
| CN112816771A (en) * | 2020-12-30 | 2021-05-18 | 南京爱睦能源自动化有限公司 | Board-level high-precision isolation direct-current voltage and current acquisition module with high protection capability |
| CN114243662A (en) * | 2021-11-01 | 2022-03-25 | 南方电网数字电网研究院有限公司 | VFTO anti-interference circuit and switching device |
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| CN102611091A (en) * | 2012-03-02 | 2012-07-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Lightning stroke prevention surge test protection circuit for electronic equipment |
| CN202693002U (en) * | 2012-06-12 | 2013-01-23 | 深圳市特安电子有限公司 | Two-wire system transmitter and anti-jamming circuit thereof |
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| CN103414177A (en) * | 2013-07-26 | 2013-11-27 | 北京广利核系统工程有限公司 | Electromagnetic protection circuit of analog signal input line |
| CN105048428A (en) * | 2015-06-29 | 2015-11-11 | 国电南京自动化股份有限公司 | Protective circuit for analog input ports |
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| CN109932619B (en) * | 2019-04-15 | 2022-02-22 | 长园科技集团股份有限公司 | Secondary signal collector of electronic sensor of power distribution network |
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Effective date of registration: 20170616 Address after: 071000 No. 5999, North Third Ring Road, Hebei, Baoding Applicant after: BAODING SIFANGSANYI ELECTRIC CO., LTD. Applicant after: Beijing Sifang Jibao Automation Co., Ltd. Applicant after: Beijing Sifang maintenance automation Limited by Share Ltd Sifang relay protection (Wuhan) Software Co., Ltd. Address before: 430223, Hubei, East Lake province Wuhan New Technology Development Zone, soup Road, Hubei Road, No. 33, China workers' science and technology park innovation base, 18, 7, 08 rooms Applicant before: Sifang relay (Wuhan) Software Co., Ltd. |
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Application publication date: 20161109 |