CN105823923B - DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected - Google Patents
DC feeder insulation against ground reduces and exchanges the device and method scurried into while detected Download PDFInfo
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- CN105823923B CN105823923B CN201610163725.1A CN201610163725A CN105823923B CN 105823923 B CN105823923 B CN 105823923B CN 201610163725 A CN201610163725 A CN 201610163725A CN 105823923 B CN105823923 B CN 105823923B
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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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- Physics & Mathematics (AREA)
- 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 kind of DC feeder insulation against ground and reduces and exchange the device and method scurried into while detected, including alterating and direct current flow control circuit, Multifunction Sensor and monitoring modular, the monitoring modular includes leakage current measurement circuit and ac current measurement circuit, the Multifunction Sensor is made of magnetic core, the first winding W1, the second winding W2 and tertiary winding W3, second winding W2 connects leakage current measurement circuit, the first winding W1 connection ac current measurement circuit with tertiary winding W3；Signal acquisition circuit of the present invention; signal collected is precisely errorless; as long as DC feeder system; once short circuit, open circuit, electric leakage or exchange occur the phenomena of the failure such as seals in; the central processing unit of main controller can be timely and effectively sent a signal to, system is allowed to make fast reaction in 1-10 seconds; a certain faulty circuit is cut off, to protect the safe operation of entire direct current system.
Description
Technical field
It is reduced present invention relates particularly to a kind of DC feeder insulation against ground and exchanges the device and method scurried into while detected.
Background technique
In the operation of the existing electric system in China, since the phenomenon that direct current system is scurried into exchange constantly occurs, seriously
The normal operation of electric system is influenced.From domestic relevant information statistical confirmation, since exchange is mixed into direct current system, or exchange
Component index exceeding standard has resulted in the major accidents such as a lot of protective relaying device failures, malfunction, and causes biggish economic damage
It loses.Therefore, alternating current-direct current swinging cross accident can be found in time, can accurately judge to be mixed into branch and is mixed into bus position, just
At the significant problem of the solutions such as China's electric system urgency.The detection device that this insulation is scurried into AC and DC is invented and develops,
Equip and improve existing direct current system, it is extremely urgent.This will also become the standard configuration of China's future direct current system.
Especially in the substation of 500KV or more, it is equipped with that exchange is scurried into, direct current mutually alters the detector of function, it is imperative.
Currently, being provided in newest 18 anti-accident measures that State Grid Corporation of China puts into effect: newly-built or transformation power transformation
Institute, Insulation Inspection Device for Direct-Current System should have test and the warning function that DC Line Fault is altered in exchange.
Currently, existing Partial DC power-supply system is netted by state uses feeder line monitoring sensor, which is either switched
The acquisition of status signal, the processing of fault-signal or transmission of feeder line status signal etc. all use analog signal.Simulation
Signal line is point-to-point output, and route controls single independence, and route node increases, and line construction is complicated, and wire rod consumption is huge
Greatly, intensive, networking and intelligentized management are not easy to.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to which providing a kind of DC feeder insulation against ground reduces and exchanges
The device and method scurried into while detected, the DC feeder insulation against ground reduce and exchange the device and method scurried into while detected
The above problem can be well solved.
To reach above-mentioned requirements, the technical solution adopted by the present invention is that: provide a kind of DC feeder insulation against ground reduce and
Exchange the device and method scurried into while detected；Including alterating and direct current flow control circuit, Multifunction Sensor and monitoring modular, prison
Surveying module includes leakage current measurement circuit and ac current measurement circuit, the Multifunction Sensor by magnetic core, the first winding W1,
Second winding W2 and tertiary winding W3 composition, the second winding W2 connects leakage current measurement circuit with tertiary winding W3, described
First winding W1 connection ac current measurement circuit；
Multifunction Sensor reduces signal and exchanges ingress signal for acquiring the insulation against ground in direct current system, and general
Collected signal passes to monitoring modular；
Monitoring modular for handling the signal that Multifunction Sensor acquires, and judges whether according to processing result
Whether insulation against ground reduces, and have AC signal to scurry into；
Electrical leakage voltage value is calculated using the collected leakage current of Multifunction Sensor in leakage current measurement circuit；
Ac current measurement circuit calculates to obtain ac voltage using the collected alternating current of Multifunction Sensor.
DC feeder insulation against ground reduces and exchanges the method scurried into while detected, comprising the following steps:
Insulation against ground in S1, Multifunction Sensor acquisition direct current system reduce signal with exchange ingress signal, and will adopt
The signal collected passes to monitoring modular；
S2, monitoring modular judge that the inductive signal of received Multifunction Sensor is that insulation against ground reduces signal or exchange
Ingress signal reduces signal if insulation against ground and executes step S3；If exchange ingress signal, step S4 is executed；
S3, monitoring modular reduce signal according to insulation against ground and are calculated insulation against ground resistance, and by it is calculated over the ground
Insulation resistance is compared with original insulation against ground resistance, if calculated insulation against ground resistance is less than original insulation against ground
Resistance, then issuing insulation against ground reduces alarm, executes step S1；
Ac voltage is calculated according to exchange ingress signal in S4, monitoring modular, and ac voltage and setting are accused
Alert value is compared, if ac voltage is greater than setting warning value, is issued exchange and is scurried into alarm, execute step S1.
The DC feeder insulation against ground reduce with exchange scurry into and meanwhile the device and method that detects have the advantage that it is as follows:
(1) this method is reduced and is exchanged with cleverly method and lower cost, to realize DC feeder insulation against ground
It scurries into while detecting.
(2) present invention is integrated with the Insulation monitoring of DC feeder, exchange seals in detection, direct current and mutually alters the multifunctional examinings such as detection
It surveys, substantially increases the intellectual monitoring ability of direct current system, improve the intelligent monitoring level of entire direct current system, and significantly
The line related for reducing former numerous standalone sensors, makes manufacturing cost sharp fall.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, at this
The same or similar part, the illustrative embodiments and their description of the application are indicated using identical reference label in a little attached drawings
For explaining the application, do not constitute an undue limitation on the present application.In the accompanying drawings:
Fig. 1 is the schematic diagram of the application.
Fig. 2 is the electrical block diagram of the application.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application clearer, below in conjunction with drawings and the specific embodiments, to this
Application is described in further detail.
In the following description, the reference of " one embodiment ", " embodiment ", " example ", " example " etc. is shown
The embodiment or example so described may include special characteristic, structure, characteristic, property, element or limit, but not each reality
Applying example or example all necessarily includes special characteristic, structure, characteristic, property, element or limit.In addition, reuse phrase " according to
Although it is possible to be to refer to identical embodiment, but be not necessarily referring to identical embodiment for one embodiment of the application ".
For the sake of simplicity, some technical features known to those skilled in the art are omitted in being described below.
According to one embodiment of the application, a kind of DC feeder insulation against ground reduction is provided and scurries into while detecting with exchanging
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
Surveying module includes leakage current measurement circuit and ac current measurement circuit, and Multifunction Sensor is by magnetic core, the first winding W1, second
Winding W2 and tertiary winding W3 composition, the second winding W2 connect leakage current measurement circuit, the first winding with tertiary winding W3
W1 connection ac current measurement circuit；
Multifunction Sensor reduces signal and exchanges ingress signal for acquiring the insulation against ground in direct current system, and general
Collected signal passes to monitoring modular；
Monitoring modular for handling the signal that Multifunction Sensor acquires, and judges whether according to processing result
Whether insulation against ground reduces, and have AC signal to scurry into；
Electrical leakage voltage value is calculated using the collected leakage current of Multifunction Sensor in leakage current measurement circuit；
Ac current measurement circuit calculates to obtain ac voltage using the collected alternating current of Multifunction Sensor.
DC feeder insulation against ground reduces and exchanges the method scurried into while detected, comprising the following steps:
Insulation against ground in S1, Multifunction Sensor acquisition direct current system reduce signal with exchange ingress signal, and will adopt
The signal collected passes to monitoring modular；
S2, monitoring modular judge that the inductive signal of received Multifunction Sensor is that insulation against ground reduces signal or exchange
Ingress signal reduces signal if insulation against ground and executes step S3；If exchange ingress signal, step S4 is executed；
S3, monitoring modular reduce signal according to insulation against ground and are calculated insulation against ground resistance, and by it is calculated over the ground
Insulation resistance is compared with original insulation against ground resistance, if calculated insulation against ground resistance is less than original insulation against ground
Resistance, then issuing insulation against ground reduces alarm, executes step S1；
Ac voltage is calculated according to exchange ingress signal in S4, monitoring modular, and ac voltage and setting are accused
Alert value is compared, if ac voltage is greater than setting warning value, is issued exchange and is scurried into alarm, execute step S1.
Wherein step S3 is specifically included:
S31, insulating monitoring host issue insulation against ground resistance measurement instruction to microprocessor, and microprocessor receives described
Start leakage current measurement circuit after insulation against ground resistance measurement instruction；
Electrical leakage voltage signal is calculated using the leakage current detected in S32, leakage current measurement circuit, and passes to micro- place
Manage device；
The electrical leakage voltage signal is AD converted by S33, microprocessor, and utilizes the electrical leakage voltage signal meter after conversion
Calculation obtains insulation against ground resistance；
S34, calculated insulation against ground resistance is compared with original insulation against ground resistance, if it is calculated over the ground
Insulation resistance is less than original insulation against ground resistance, then issuing insulation against ground reduces alarm.
Wherein step S4 is specifically included:
S41, insulating monitoring host issue exchange to microprocessor and scurry into detection instruction, and microprocessor receives the exchange
Start ac current measurement circuit after scurrying into detection instruction；
S42, ac current measurement circuit are calculated to obtain ac voltage, and are passed to micro- using the alternating current detected
Processor；
The ac voltage is AD converted by S43, microprocessor, and by the ac voltage after conversion and sets announcement
Alert value is compared, if ac voltage is greater than setting warning value, is issued exchange and is scurried into alarm.
This method key is to form a multi-detector with a super-magnetic conducting magnetic core, three windings.This method because
For the method for once surveying the number of turns multiturn using CT1 direct current, device input signal signal-to-noise ratio is fundamentally improved, wherein CT1 can be with
To cross function sensor.
Insulating monitoring principle:
When microprocessor control signals processing circuit does not work, when magnetic flux gate circuit works, the second winding W2 and third around
Group W3 constitutes fluxgate detection coil；Rp is balance bridge electricity yin, and Rt detects resistor bridge, and resistance R3, R4 are that analog DC feeder line connects
Ground resistance；By cut-offfing for control switch K1, K2, CT1 can be made to flow through out-of-balance current.This programme uses special circuit,
Using fluxgate principle, the direct current Ground leakage current of 0.02mA can be measured, and domestic all leakage current sensors now, inspection
Surveying precision can only achieve 0.1mA.
Monitoring principle is scurried into exchange:
When microprocessor control signals processing circuit works, and magnetic flux gate circuit does not work, S1 is alternating voltage, resistance
R5 is conflict resistance when DC bus is scurried into exchange.No matter alternating voltage scurries into positive bus-bar or negative busbar, passes through control
Switch K1, K2 can allow alternating current to form current path by CT1.Because 100A grades of DC current positive and negative busbar is simultaneously
Across CT1, magnetic flux is cancelled out each other.Equally, this programme uses special circuit, can detecte 0.1mA alternating current.
Insulation monitoring device minimum leakage current I0 is calculated:
Since the requirement insulation measurement range of national standard is greater than 0~999K, while when measuring, the investment of detection resistance
Caused by the ratio between negative, positive pole voltage-to-ground U-/U+ less than 1.22.Because cathode outlet signal relay resistance is 20k and most rises
Dynamic voltage is 60%~70%Un.So Rp and Rt parallel resistance have to be larger than 20*40/60=13k.Usually balance resistor bridge Rt takes
30K, detection resistance be Rt take 150k. when insulation to ground resistance R3 or R4 are 999k when, flow through CT1 leakage current be can by Fig. 2
Know:
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 by calculating it is found that the minimum sensitivity of insulation monitoring device should be 0.12mA above.State at present
Inside and outside current sensor minimum divides sensitivity to be only capable of detecting 0.1mA, is not able to satisfy the requirement of national standard.And this method because
Using the method for multiturn of CT1 direct current, the sensitivity technique of device input signal is fundamentally improved, sensitivity can be accomplished
0.02mA makes sensitivity improve 5 times.
Anti- external magnetic field interference performance is strong:
Due to sensitive very high, input magnetic field strength be 0.1mA circle, the magnetic induction intensity that magnetic circuit can be formed be for
0.75Gs.It calculates as follows: selecting high permeability material μ=300mT.m/A=3000Gs.m/A, magnetic circuit overall length L=40mm that device is used
=0.04m。
B=μH=μIn/L=3000*0.1/(1000*0.04)=7.5Gs
This is a very faint magnetic field, it is easy to be resisted outer magnetic due to increasing a number of turns by the interference of external magnetic field
Field interference performance is multiplied.
Embodiment described above only indicates several embodiments of the invention, and the description thereof is more specific and detailed, but not
It can be interpreted as limitation of the scope of the invention.It should be pointed out that for those of ordinary skill in the art, not departing from
Under the premise of present inventive concept, various modifications and improvements can be made, these belong to the scope of the present invention.Therefore this hair
Bright protection scope should be subject to the claim.
Claims (1)
1. a kind of reduced using DC feeder insulation against ground is scurried into while method that the device that detects is detected with exchange, spy
Sign is: the device includes:
Alterating and direct current flow control circuit, Multifunction Sensor and monitoring modular, the monitoring modular include leakage current measurement circuit
With ac current measurement circuit, the Multifunction Sensor is by magnetic core, the first winding W1, the second winding W2 and tertiary winding W3 group
At the second winding W2 connects leakage current measurement circuit with tertiary winding W3, and the first winding W1 connection alternating current is surveyed
Measure circuit；
The Multifunction Sensor reduces signal and exchanges ingress signal for acquiring the insulation against ground in direct current system, and general
Collected signal passes to monitoring modular；
The monitoring modular for handling the signal that Multifunction Sensor acquires, and judges whether according to processing result
Whether insulation against ground reduces, and have AC signal to scurry into；
Electrical leakage voltage value is calculated using the collected leakage current of Multifunction Sensor in the leakage current measurement circuit；
The ac current measurement circuit calculates to obtain ac voltage institute using the collected alternating current of Multifunction Sensor
State monitoring modular further include:
Insulating monitoring host receives the signal of Multifunction Sensor transmitting, and to alterating and direct current flow control circuit and microprocessor
Issue control signal；
Microprocessor starts leakage current measurement circuit or ac current measurement for receiving the control signal of insulating monitoring host
Circuit work, and the signal transmitted to leakage current measurement circuit or ac current measurement circuit is handled, according to processing result
Judge whether insulation against ground reduction, and whether there is AC signal to scurry into, and judging result is sent to insulating monitoring host；
Communication interface circuit, for the communication monitoring modular between microprocessor and insulating monitoring host further include:
Sound light alarming circuit, the control signal for receiving microprocessor carry out sound-light alarm；
Power supply, for microprocessor, communication interface circuit, sound light alarming circuit, leakage current measurement circuit, ac current measurement
Circuit, alterating and direct current flow control circuit and Multifunction Sensor provide power supply；Communication interface circuit uses RS485 communication interface；
Method includes the following steps:
Insulation against ground in S1, Multifunction Sensor acquisition direct current system reduce signal with exchange ingress signal, and will collect
Signal pass to monitoring modular；
S2, monitoring modular judge that the inductive signal of received Multifunction Sensor is that insulation against ground reduces signal or exchange is scurried into
Signal reduces signal if insulation against ground and executes step S3；If exchange ingress signal, step S4 is executed；
S3, monitoring modular reduce signal according to insulation against ground and are calculated insulation against ground resistance, and by calculated insulation against ground
Resistance is compared with original insulation against ground resistance, if calculated insulation against ground resistance is less than original insulation against ground electricity
Resistance, then issuing insulation against ground reduces alarm, executes step S1；
Ac voltage is calculated according to exchange ingress signal in S4, monitoring modular, and by ac voltage and sets warning value
It is compared, if ac voltage is greater than setting warning value, issues exchange and scurry into alarm, execute the tool of step S1 described in step S1
Body are as follows: the insulation against ground in Multifunction Sensor acquisition direct current system reduce signal with exchange ingress signal, and will be collected
Signal passes to step S3 described in insulating monitoring host and specifically includes:
S31, insulating monitoring host issue insulation against ground resistance measurement instruction to microprocessor, microprocessor receive it is described over the ground
Start leakage current measurement circuit after insulation measurement instruction；
Electrical leakage voltage signal is calculated using the leakage current detected in S32, leakage current measurement circuit, and passes to micro process
Device；
The electrical leakage voltage signal is AD converted by S33, microprocessor, and is calculated using the electrical leakage voltage signal after conversion
To insulation against ground resistance；
S34, calculated insulation against ground resistance is compared with original insulation against ground resistance, if calculated insulation against ground
Resistance is less than original insulation against ground resistance, then issues the insulation against ground reduction alarm step S4 and specifically include:
S41, insulating monitoring host issue exchange to microprocessor and scurry into detection instruction, and microprocessor receives the exchange and scurries into
Start ac current measurement circuit after detection instruction；
S42, ac current measurement circuit calculate to obtain ac voltage, and pass to micro process using the alternating current detected
Device；
The ac voltage is AD converted by S43, microprocessor, and by the ac voltage after conversion and sets warning value
It is compared, if ac voltage is greater than setting warning value, issues 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 |
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| Publication Number | Publication Date |
|---|---|
| CN105823923A CN105823923A (en) | 2016-08-03 |
| CN105823923B true CN105823923B (en) | 2019-07-05 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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|---|---|
| CN105823923A (en) | 2016-08-03 |
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