CN105823923A - Device and method of simultaneously detecting DC feeder line ground insulation reduction and AC channeling - Google Patents
Device and method of simultaneously detecting DC feeder line ground insulation reduction and AC channeling Download PDFInfo
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- CN105823923A CN105823923A CN201610163725.1A CN201610163725A CN105823923A CN 105823923 A CN105823923 A CN 105823923A CN 201610163725 A CN201610163725 A CN 201610163725A CN 105823923 A CN105823923 A CN 105823923A
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- signal
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- against ground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a device and method of simultaneously detecting DC feeder line ground insulation reduction and AC channeling. The device comprises an AC/DC control circuit, a multifunctional sensor and a monitoring module, the monitoring module comprises a leakage current measurement circuit and an AC measurement circuit, and the multifunctional sensor is composed of a first winding W1, a second winding W2 and a third winding W3. The second winding W2 and the third winding W3 are connected with the leakage current measurement circuit, and the first winding W1 is connected with the AC measurement circuit. A signal acquisition circuit adopted by the present invention can acquire the signals accurately and inerrably, and can send out a signal to a central processor of a main control computer timely and effectively in 1-10 seconds once a fault phenomenon, such as the short circuit, the open circuit, the electric leakage, the AC channeling, etc., occurs in a DC feeder line system, so that the system can respond rapidly to cut off a faulted circuit, thereby protecting the safe operation of a whole DC system.
Description
Technical field
Present invention relates particularly to a kind of DC feeder insulation against ground reduction and scurry into, with exchanging, the device and method simultaneously detected.
Background technology
In the operation of the existing power system of China, constantly occur, the most seriously owing to exchanging the phenomenon scurrying into straight-flow system
Have influence on the properly functioning of power system.From domestic relevant information statistical confirmation, owing to exchange is mixed into straight-flow system, or exchange
Component index exceeding standard, has resulted in the major accidents such as malfunctioning, the misoperation of a lot of protective relaying device, and causes bigger economic damage
Lose.Accordingly, it is capable to find alternating current-direct current swinging cross accident in time, can judge accurately be mixed into branch road and be mixed into bus position, just
The significant problem of the solutions such as the power system of Cheng Liao China is anxious.Invent and develop the detection device that this insulation is scurried into AC and DC,
Equip and improve existing straight-flow system, extremely the most urgent.This also will become the standard configuration of China's straight-flow system in future.
Especially in the transformer station of more than 500KV, it is equipped with that exchange is scurried into, direct current alters the detector of function mutually, the most imperative.
At present, specify in up-to-date 18 anti-accident measures that State Grid Corporation of China puts into effect: the newly-built or power transformation of transformation
Institute, Insulation Inspection Device for Direct-Current System should possess exchange and alter test and the warning function of DC Line Fault.
At present, the existing Partial DC power-supply system of state's net have employed feeder line monitoring sensor, and no matter this sensor is switch
The collection of status signal, the process of fault-signal, or the transmission etc. of feeder line status signal, all use analogue signal.Simulation
Signal line is point-to-point output, and circuit controls single independence, and circuit node increases, and line construction is complicated, and wire rod consumption is huge
Greatly, it is not easy to intensive, networking and intelligentized management.
Summary of the invention
Present invention aims to the deficiencies in the prior art, it is provided that a kind of DC feeder insulation against ground reduces and exchanges
Scurrying into the device and method simultaneously detected, this DC feeder insulation against ground reduces scurries into, with exchanging, the device and method simultaneously detected
The problems referred to above can be solved well.
For reaching above-mentioned requirements, the present invention adopts the technical scheme that: provide a kind of DC feeder insulation against ground to reduce and
The device and method simultaneously detected is scurried in exchange；Including alterating and direct current flow control circuit, Multifunction Sensor and monitoring modular, prison
Survey module include leakage current measurement circuit and ac current measurement circuit, described Multifunction Sensor by magnetic core, the first winding W1,
Second winding W2 and tertiary winding W3 composition, described second winding W2 and tertiary winding W3 connects leakage current measurement circuit, described
First winding W1 connects ac current measurement circuit；
Multifunction Sensor, reduces signal for gathering the insulation against ground in straight-flow system and exchanges ingress signal, and will gather
To signal pass to monitoring modular；
Monitoring modular, for processing the signal of Multifunction Sensor collection, and judges whether over the ground according to result
Whether insulation reduces, and have AC signal to scurry into；
Leakage current measurement circuit, the leakage current utilizing Multifunction Sensor to collect is calculated electrical leakage voltage value；
Ac current measurement circuit, the alternating current utilizing Multifunction Sensor to collect calculates and obtains ac voltage.
DC feeder insulation against ground reduces scurries into, with exchanging, the method simultaneously detected, and comprises the following steps:
S1, Multifunction Sensor gather the insulation against ground in straight-flow system to be reduced signal and exchanges ingress signal, and will collect
Signal pass to monitoring modular；
S2, monitoring modular judge that the induced signal of the Multifunction Sensor received is that insulation against ground reduces signal or exchange is scurried into
Signal, if insulation against ground reduces signal and performs step S3；If exchange ingress signal, perform step S4；
S3, monitoring modular reduce signal according to insulation against ground and are calculated insulation against ground resistance, and the insulation against ground that will calculate
Resistance compares with original insulation against ground resistance, if the insulation against ground resistance calculated is less than original insulation against ground electricity
Resistance, then send insulation against ground and reduce alarm, perform step S1；
S4, monitoring modular are calculated ac voltage according to exchange ingress signal, and by ac voltage and setting warning value
Compare, if ac voltage is more than setting warning value, then sends exchange and scurry into alarm, perform step S1.
This DC feeder insulation against ground reduces scurries into the device and method simultaneously detected have the advantage that as follows with exchanging:
(1) this method is with method cleverly and relatively low cost, it is achieved that DC feeder insulation against ground reduction is scurried into exchanging
Detect simultaneously.
(2) present invention is integrated with the Insulation monitoring of DC feeder, exchange seals in detection, direct current and alters the multifunctional examinings such as detection mutually
Survey, substantially increase the intellectual monitoring ability of straight-flow system, make the intelligent monitoring level of whole straight-flow system improve, and significantly
Before decreasing, the line related of numerous standalone sensors, makes manufacturing cost significantly decline.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, at this
A little accompanying drawings use identical reference number to represent same or analogous part, the schematic description and description of the application
For explaining the application, it is not intended that the improper restriction to the application.In the accompanying drawings:
Fig. 1 is the schematic diagram of the application.
Fig. 2 is the electrical block diagram of the application.
Detailed description of the invention
For making the purpose of the application, technical scheme and advantage clearer, below in conjunction with drawings and the specific embodiments, to this
Application is described in further detail.
In the following description, quoting of " embodiment ", " embodiment ", " example ", " example " etc. is shown
The embodiment so described or example can include special characteristic, structure, characteristic, character, element or limit, but the most each reality
Execute example or example the most necessarily includes special characteristic, structure, characteristic, character, element or limit.It addition, reuse phrase " according to
One embodiment of the application " although it is possible to refer to identical embodiment, but it is not necessarily referring to identical embodiment.
For the sake of simplicity, eliminate in below describing and well known to a person skilled in the art some technical characteristic.
An embodiment according to the application, it is provided that a kind of DC feeder insulation against ground reduction detects with exchanging to scurry into simultaneously
Device and method, as shown in Figure 1 to Figure 2, including alterating and direct current flow control circuit, Multifunction Sensor and monitoring modular, prison
Survey module include leakage current measurement circuit and ac current measurement circuit, Multifunction Sensor by magnetic core, the first winding W1, second
Winding W2 and tertiary winding W3 composition, described second winding W2 and tertiary winding W3 connects leakage current measurement circuit, the first winding
W1 connects ac current measurement circuit；
Multifunction Sensor, reduces signal for gathering the insulation against ground in straight-flow system and exchanges ingress signal, and will gather
To signal pass to monitoring modular；
Monitoring modular, for processing the signal of Multifunction Sensor collection, and judges whether over the ground according to result
Whether insulation reduces, and have AC signal to scurry into；
Leakage current measurement circuit, the leakage current utilizing Multifunction Sensor to collect is calculated electrical leakage voltage value；
Ac current measurement circuit, the alternating current utilizing Multifunction Sensor to collect calculates and obtains ac voltage.
DC feeder insulation against ground reduces scurries into, with exchanging, the method simultaneously detected, and comprises the following steps:
S1, Multifunction Sensor gather the insulation against ground in straight-flow system to be reduced signal and exchanges ingress signal, and will collect
Signal pass to monitoring modular；
S2, monitoring modular judge that the induced signal of the Multifunction Sensor received is that insulation against ground reduces signal or exchange is scurried into
Signal, if insulation against ground reduces signal and performs step S3；If exchange ingress signal, perform step S4；
S3, monitoring modular reduce signal according to insulation against ground and are calculated insulation against ground resistance, and the insulation against ground that will calculate
Resistance compares with original insulation against ground resistance, if the insulation against ground resistance calculated is less than original insulation against ground electricity
Resistance, then send insulation against ground and reduce alarm, perform step S1；
S4, monitoring modular are calculated ac voltage according to exchange ingress signal, and by ac voltage and setting warning value
Compare, if ac voltage is more than setting warning value, then sends exchange and scurry into alarm, perform step S1.
Wherein step S3 specifically includes:
S31, insulating monitoring main frame to microprocessor send insulation against ground resistance measurement instruction, microprocessor receive described in over the ground
Leakage current measurement circuit is started after insulation measurement instruction；
S32, leakage current measurement circuit utilize the leakage current detected to be calculated electrical leakage voltage signal, and pass to micro-process
Device；
Described electrical leakage voltage signal is AD converted by S33, microprocessor, and utilizes the electrical leakage voltage signal after conversion to calculate
To insulation against ground resistance；
S34, the insulation against ground resistance calculated is compared with original insulation against ground resistance, if the insulation against ground calculated
Resistance less than original insulation against ground resistance, then sends insulation against ground and reduces alarm.
Wherein step S4 specifically includes:
S41, insulating monitoring main frame send exchange to microprocessor and scurry into detection instruction, and microprocessor receives described exchange and scurries into
Ac current measurement circuit is started after detection instruction；
S42, ac current measurement circuit utilize the alternating current detected calculating to obtain ac voltage, and pass to micro-process
Device；
Described ac voltage is AD converted by S43, microprocessor, and will convert after ac voltage with set warning value
Compare, if ac voltage is more than setting warning value, then sends exchange and scurry into alarm.
This method is it is crucial that form multi-detectors with a super-magnetic conducting magnetic core, three windings.This method because of
For the method using CT1 direct current once to survey number of turn multiturn, fundamentally improving device input signal signal to noise ratio, wherein CT1 is permissible
For crossing function sensor.
Insulating monitoring principle:
Do not work when microprocessor control signals processes circuit, during the work of fluxgate circuit, the second winding W2 and tertiary winding W3
Constitute fluxgate detection coil；Rp is that balance bridge electricity is cloudy, and Rt detects resistor bridge, and resistance R3, R4 are analog DC feeder line ground connection electricity
Resistance；By controlling cut-offfing of switch K1, K2, CT1 can be made to flow through out-of-balance current.This programme uses special circuit, utilizes
Fluxgate principle, can measure the direct current Ground leakage current of 0.02mA, and present domestic all of leakage current sensor, detection essence
Degree can only achieve 0.1mA.
Exchange and scurry into monitoring principle:
When microprocessor control signals processes circuit work, and when fluxgate circuit does not works, S1 is alternating voltage, and resistance R5 is
Conflict resistance during dc bus is scurried in exchange.No matter alternating voltage scurries into positive bus-bar or negative busbar, is switched by control
K1, K2, can allow alternating current form current path by CT1.Because the DC current positive and negative busbar of 100A level also cross
CT1, its magnetic flux is cancelled out each other.Equally, this programme uses special circuit, 0.1mA alternating current can be detected.
Insulation monitoring and warning device minimum leakage current I0 calculates:
Owing to the requirement insulation measurement scope of GB is greater than 0～999K, when measuring, the input of detection resistance causes simultaneously
The ratio U-/U+ of negative, positive pole voltage-to-ground less than 1.22.Because negative pole outlet signal relay resistance is 20k and most plays galvanic electricity
Pressure is 60%～70%Un.So Rp Yu Rt parallel resistance have to be larger than 20*40/60=13k.Generally balance bridge resistance Rt takes 30K,
Detection resistance is that Rt takes 150k. when resistance to earth R3 or R4 that insulate is 999k, flows through the leakage current of CT1 for as shown in Figure 2:
I1+I0 =220/(Rt//Rp+Rp//R-)
=220/(30//150+30//999)
=220/55
=4(mA)
I0 =4*30/(30+999)
=0.12(mA)
Sensitivity requirement is calculated by above, and the minimum sensitivity of insulation monitoring and warning device should be 0.12mA.The most both at home and abroad
Current sensor minimum divides sensitivity to be only capable of 0.1mA being detected, it is impossible to meet the requirement of national standard.And this method is because using
The method of multiturn of CT1 direct current, fundamentally improves the sensitivity technique of device input signal, and sensitivity can be accomplished
0.02mA, makes sensitivity improve 5 times.
Anti-external magnetic field interference performance is strong:
Due to sensitive the highest, input magnetic field intensity is 0.1mA circle, and the magnetic induction that can be formed at magnetic circuit is 0.75Gs.Meter
Calculate as follows: select high permeability material μ=300mT.m/A=3000Gs.m/A, magnetic circuit overall length L=40mm=0.04m that device is used.
B=μH=μIn/L=3000*0.1/(1000*0.04)=7.5Gs
This is a magnetic field the faintest, it is easy to disturbed by external magnetic field, and owing to adding a number of turn, anti-external magnetic field is done
The ability of disturbing is multiplied.
Embodiment described above only represents the several embodiments of the present invention, and it describes more concrete and detailed, but not
It is understood that as limitation of the scope of the invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from
On the premise of present inventive concept, it is also possible to make some deformation and improvement, these broadly fall into scope.Therefore this
Bright protection domain should be as the criterion with described claim.
Claims (9)
1. a DC feeder insulation against ground reduction scurries into, with exchanging, the device simultaneously detected, it is characterised in that include alternating current-direct current
Current control circuit, Multifunction Sensor and monitoring modular, described monitoring modular includes leakage current measurement circuit and alternating current
Measuring circuit, described Multifunction Sensor is made up of magnetic core, the first winding W1, the second winding W2 and tertiary winding W3, and described
Two winding W2 and tertiary winding W3 connect leakage current measurement circuit, and described first winding W1 connects ac current measurement circuit；
Described Multifunction Sensor, reduces signal for gathering the insulation against ground in straight-flow system and exchanges ingress signal, and will
The signal collected passes to monitoring modular；
Described monitoring modular, for processing the signal of Multifunction Sensor collection, and judges whether according to result
Whether insulation against ground reduces, and have AC signal to scurry into；
Described leakage current measurement circuit, the leakage current utilizing Multifunction Sensor to collect is calculated electrical leakage voltage value；
Described ac current measurement circuit, the alternating current utilizing Multifunction Sensor to collect calculates and obtains ac voltage.
Device the most according to claim 1, it is characterised in that: described monitoring modular also includes:
Insulating monitoring main frame, receives the signal of Multifunction Sensor transmission, and to alterating and direct current flow control circuit and microprocessor
Send control signal；
Microprocessor, for receiving the control signal of insulating monitoring main frame, starts leakage current measurement circuit or ac current measurement
Circuit works, and the signal transmitting leakage current measurement circuit or ac current measurement circuit processes, according to result
Judge whether that insulation against ground reduces, and whether have AC signal to scurry into, and will determine that result is sent to insulating monitoring main frame；
Communication interface circuit, the communication between microprocessor and insulating monitoring main frame.
Device the most according to claim 2, it is characterised in that: described monitoring modular also includes:
Sound light alarming circuit, carries out sound and light alarm for receiving the control signal of microprocessor.
4. power supply, for surveying to microprocessor, communication interface circuit, sound light alarming circuit, leakage current measurement circuit, alternating current
Amount circuit, alterating and direct current flow control circuit and Multifunction Sensor provide power supply.
5. according to the device described in claim 1, it is characterised in that: described communication interface circuit uses RS485 communication interface.
6. a DC feeder insulation against ground reduction scurries into, with exchanging, the method simultaneously detected, it is characterised in that include following step
Rapid:
S1, Multifunction Sensor gather the insulation against ground in straight-flow system to be reduced signal and exchanges ingress signal, and will collect
Signal pass to monitoring modular；
S2, monitoring modular judge that the induced signal of the Multifunction Sensor received is that insulation against ground reduces signal or exchange is scurried into
Signal, if insulation against ground reduces signal and performs step S3；If exchange ingress signal, perform step S4；
S3, monitoring modular reduce signal according to insulation against ground and are calculated insulation against ground resistance, and the insulation against ground that will calculate
Resistance compares with original insulation against ground resistance, if the insulation against ground resistance calculated is less than original insulation against ground electricity
Resistance, then send insulation against ground and reduce alarm, perform step S1；
S4, monitoring modular are calculated ac voltage according to exchange ingress signal, and by ac voltage and setting warning value
Compare, if ac voltage is more than setting warning value, then sends exchange and scurry into alarm, perform step S1.
7. according to the method described in claim 6, it is characterised in that: described step S1 is particularly as follows: Multifunction Sensor gathers direct current
Insulation against ground in system reduces signal and exchanges ingress signal, and the signal collected is passed to insulating monitoring main frame.
8. according to the method described in claim 7, it is characterised in that: described step S3 specifically includes:
S31, insulating monitoring main frame to microprocessor send insulation against ground resistance measurement instruction, microprocessor receive described in over the ground
Leakage current measurement circuit is started after insulation measurement instruction；
S32, leakage current measurement circuit utilize the leakage current detected to be calculated electrical leakage voltage signal, and pass to micro-process
Device；
Described electrical leakage voltage signal is AD converted by S33, microprocessor, and utilizes the electrical leakage voltage signal after conversion to calculate
To insulation against ground resistance；
S34, the insulation against ground resistance calculated is compared with original insulation against ground resistance, if the insulation against ground calculated
Resistance less than original insulation against ground resistance, then sends insulation against ground and reduces alarm.
9. according to the method described in claim 7, it is characterised in that: described step S4 specifically includes:
S41, insulating monitoring main frame send exchange to microprocessor and scurry into detection instruction, and microprocessor receives described exchange and scurries into
Ac current measurement circuit is started after detection instruction；
S42, ac current measurement circuit utilize the alternating current detected calculating to obtain ac voltage, and pass to micro-process
Device；
Described ac voltage is AD converted by S43, microprocessor, and will convert after ac voltage with set warning value
Compare, if ac voltage is more than setting warning value, then sends exchange and scurry into alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610163725.1A CN105823923B (en) | 2016-03-22 | 2016-03-22 | DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610163725.1A CN105823923B (en) | 2016-03-22 | 2016-03-22 | DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105823923A true CN105823923A (en) | 2016-08-03 |
| CN105823923B CN105823923B (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610163725.1A Active CN105823923B (en) | 2016-03-22 | 2016-03-22 | DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324394A (en) * | 2016-08-17 | 2017-01-11 | 成都国能龙源科技有限公司 | DC feed line system |
| CN106841956A (en) * | 2017-03-31 | 2017-06-13 | 国网江苏省电力公司宿迁供电公司 | A kind of anti-instantaneous ac scurries into insulation monitoring and warning device |
| CN109884451A (en) * | 2019-03-19 | 2019-06-14 | 卡斯柯信号有限公司 | A kind of insulating leakage current test device |
| CN110579697A (en) * | 2019-10-25 | 2019-12-17 | 国网江苏省电力有限公司盐城供电分公司 | Multifunctional insulation detection device based on direct current system and detection method thereof |
| CN117630586A (en) * | 2023-10-24 | 2024-03-01 | 福建时代星云科技有限公司 | Insulation detection method and terminal of energy storage system |
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| JPH09236623A (en) * | 1996-02-29 | 1997-09-09 | Toshiba Corp | Current sensor, interlock system and work system |
| CN103576052B (en) * | 2012-08-02 | 2016-09-14 | 北京人民电器厂有限公司 | Determine that alternating current seals in the system and method for DC system fault branch road |
| CN103135038B (en) * | 2013-02-01 | 2015-08-05 | 广州优维电子科技有限公司 | Straight-flow system exchanges crosstalk and insulation fault monitoring selection method |
| CN203365554U (en) * | 2013-08-02 | 2013-12-25 | 上海中联伟安电气有限公司 | Device for on-line detection of high voltage insulation resistance by using direct current components |
| CN203405561U (en) * | 2013-09-06 | 2014-01-22 | 国家电网公司 | Direct current power source grounding fault searching device |
| CN103558507A (en) * | 2013-10-29 | 2014-02-05 | 国家电网公司 | Sensor for direct current fault line selection and alternating current interlarding line selection |
| CN104090245B (en) * | 2014-04-03 | 2017-03-29 | 大连科海测控技术有限公司 | The detection means that a kind of DC power-supply system alternating current is mixed into |
| CN204116431U (en) * | 2014-09-02 | 2015-01-21 | 沈阳汇博自动化仪表有限公司 | A kind of fast-response core-theaded type DC leakage flow sensor |
| CN104502778A (en) * | 2014-12-08 | 2015-04-08 | 烟台东方电子玉麟电气有限公司 | Detecting device for alternating current entering of direct current system and realizing method of detecting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324394A (en) * | 2016-08-17 | 2017-01-11 | 成都国能龙源科技有限公司 | DC feed line system |
| CN106324394B (en) * | 2016-08-17 | 2019-09-24 | 成都国能龙源科技有限公司 | DC feeder system |
| CN106841956A (en) * | 2017-03-31 | 2017-06-13 | 国网江苏省电力公司宿迁供电公司 | A kind of anti-instantaneous ac scurries into insulation monitoring and warning device |
| CN109884451A (en) * | 2019-03-19 | 2019-06-14 | 卡斯柯信号有限公司 | A kind of insulating leakage current test device |
| CN110579697A (en) * | 2019-10-25 | 2019-12-17 | 国网江苏省电力有限公司盐城供电分公司 | Multifunctional insulation detection device based on direct current system and detection method thereof |
| CN117630586A (en) * | 2023-10-24 | 2024-03-01 | 福建时代星云科技有限公司 | Insulation detection method and terminal of energy storage system |
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| Publication number | Publication date |
|---|---|
| CN105823923B (en) | 2019-07-05 |
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