CN106249188A - A kind of detection method to online earth fault alarm device - Google Patents
A kind of detection method to online earth fault alarm device Download PDFInfo
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- CN106249188A CN106249188A CN201610881385.6A CN201610881385A CN106249188A CN 106249188 A CN106249188 A CN 106249188A CN 201610881385 A CN201610881385 A CN 201610881385A CN 106249188 A CN106249188 A CN 106249188A
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- signal
- alarm device
- earth fault
- phase
- fault alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of detection method to online earth fault alarm device originally, relate to detecting fault line for un-ground neutral power system inspection field, comprise the following steps: online earth fault alarm device is installed on three-phase windings by (1)；(2) in emulator, build model and generate different faults data according to voltage, current relationship simulation；(3) by the fault simulation signal of analog signal output board Output simulation；(4) analogue signal is amplified by power amplifier；(5) signal after amplifying sends into three-phase windings；(6) online earth fault alarm device senses three-phase windings electric quantity change and automatically gathers；(7) signal collected is sent to computer by wireless transmissioning mode；(8) signal received is contrasted by computer with simulated fault signal；(9) detection of online earth fault alarm device is completed.Online earth fault alarm device earth fault warning function in present power distribution network can accurately be detected by the present invention.
Description
Technical field
The present invention relates to detecting fault line for un-ground neutral power system inspection field, particularly to one to online earth fault warning dress
The detection method put.
Background technology
At present, in distribution, singlephase earth fault remains as one of the highest fault of distribution line occurrence frequency.Due to China
Distribution many employings small current neutral grounding system, occurs still can operate with failure 1 to 2 hour during singlephase earth fault, if but long-term
Running, will there is bigger potential safety hazard in the voltage that healthy phases raises.And distribution network shelf structure is the weakest, distribution line
Branched line is more, equipment more disperses, and Distribution Network Failure location and cause investigation required time are longer.Therefore, above-mentioned for solving
Existing problems, numerous producers be devoted to develop can realize distribution run signal gather and analyze line status online acquisition complete
Device, the running current of circuit, voltage can be acquired by such device, and screened the abnormality of circuit by main station system
And report to the police, and such device uses the mode in main website analysis to be identified judging to line single phase grounding failure, is better than
Existing common distribution system fault indicator.
Present stage, the computational methods that singlephase earth fault is differentiated by domestic common online earth fault alarm device are each
Differ, the most installed to the overall using effect of online earth fault alarm device of power supply administration the best, and existing based on not
It is fixed to the single-phase earthing warning of such device that band record wave energy fault detector test platform does not possess effective technological means
Bit function is tested, and therefore, invents a kind of earth fault testing scheme based on real-timedigital simulation tester, to
Line earth fault alarm device carries out test and is particularly important.
Summary of the invention
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that
The invention provides a kind of detection method to online earth fault alarm device, this comprises the following steps:
A kind of detection method to online earth fault alarm device, it is characterised in that comprise the following steps:
(1) online earth fault alarm device is installed on three-phase windings；
(2) in emulator, build model and generate different faults data according to voltage, current relationship simulation；
(3) by the fault simulation signal of analog signal output board Output simulation；
(4) analogue signal is amplified by power amplifier；
(5) signal after amplifying sends into three-phase windings；
(6) online earth fault alarm device senses three-phase windings electric quantity change and automatically gathers；
(7) signal collected is sent to computer by wireless transmissioning mode；
(8) signal received is contrasted by computer with simulated fault signal；
(9) detection of online earth fault alarm device is completed.
Preferably, step (2) described voltage, current relationship include the residual voltage U of trouble pointK0For:Wherein, UAG、UBG、UCGIt is respectively the voltage-to-ground of A, B, C three-phase；Flow through trouble point k
Electric current IKFor:Wherein, UAG、UBG、UCGBe respectively A, B,
The voltage-to-ground of C three-phase,For the capacitance current sum relatively of A time properly functioning；Work as line failure, non-
The electric current that fault phase circuit top is flow through is, wherein C0IFor circuit I phase over the ground
Electric capacity；The electric current flow through at faulty line top is, its
In wherein C0IIDirect-to-ground capacitance for circuit II phase.
Preferably, step (4) described power amplifier can realize three-phase current, voltage signal amplifies output without phase angle difference.
Online earth fault alarm device singlephase earth fault conventional in present power distribution network can be reported to the police and be positioned by the present invention
Function accurately detects, to the online earth fault alarm device tool using distinct methods to differentiate singlephase earth fault
Versatility, the present invention is had also to have the advantages that
(1). the online earth fault alarm device that waveform requirements is strict can be carried out singlephase earth fault warning function test,
Also the singlephase earth fault warning function of the common overhead type fault detector without record wave energy can be tested.
(2). having multichannel power amplifier can be amplified defeated to the simulation waveform of the conventional power plant of band outgoing lines
Go out.
(3). simulate different types of earth fault, it is possible to online earth fault alarm device is carried out single-phase earthing event
The systematic testing of barrier.
(4). it is capable of the online earth fault alarm device of many sets is carried out closed loop test simultaneously, easy and simple to handle.
Accompanying drawing explanation
The method flow schematic diagram that Fig. 1 provides for the present invention.
The system structure schematic diagram that Fig. 2 provides for the embodiment of the present invention.
The single spur track fault ground schematic diagram that Fig. 3 provides for the embodiment of the present invention.
The single spur track fault ground phasor diagram that Fig. 4 provides for the embodiment of the present invention.
The multiple branch circuit fault ground schematic diagram that Fig. 5 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe wholely, build the detecting system of online earth fault alarm device as shown in Figure 2, including real-time digital simulator (Real
Time Digital Simulator), power amplifier, three-phase windings, equipment under test, wireless data transmission channel, computer,
Carry out in accordance with the following steps when online earth fault alarm device is detected, as shown in Figure 1:
Step S1, online earth fault alarm device is installed on three-phase windings:
As shown in Figure 2 tested online earth fault alarm device is installed on three-phase windings.
Step S2, build in emulator model and according to voltage, current relationship simulation generate different faults data:
Use the RSCAD(Real system of real-time digital simulator (Real Time Digital Simulator)
Computer aided design) simulation software transformer station's outlet single-phase earthing to different classes of neutral ground type
Fault carries out simulation modeling, arranges common single-phase fault situation in power distribution network, and by the three-phase current of emulation generation, voltage analog
Signal is by GTAO(Giga transform analog output) analog signal output board exports.Simulation modeling is also
Obtain three-phase current, voltage according to principle as follows, by circuit generation A phase single-phase earthing as a example by illustrate.
When the power distribution network of this kind of earthing mode is properly functioning, three relatively distribution capacity identical, be C0, three-phase voltage
Symmetry, capacitive earth current sum is equal to zero.After A phase breaks down, as it is shown on figure 3, voltage-to-ground vanishing, direct-to-ground capacitance
Being shorted, other two healthy phases (B phase and C phase) voltage becomes the line voltage of this relative A phase, and numerical value rises a height of times, phasor
Graph of a relation is as shown in Figure 4.Now, the residual voltage U of trouble pointK0For, flow through
The electric current I of trouble point kKFor.Wherein,
UAG、UBG、UCGIt is respectively the voltage-to-ground of A, B, C three-phase, for the capacitance current sum relatively of A time properly functioning.
Fig. 5 is the graph of a relation between faulty line and non-fault line zero-sequence current, as it is shown in figure 5, circuit I and circuit I
Relatively electric capacity be respectively C0I、C0II, every relatively equivalent capacity of bus and system power supply is C0s, when circuit A phase occurs
Fault, the electric current that non-fault line top is flow through is, faulty line top
The electric current flow through be。
From the foregoing, faulty line zero-sequence current numerical value equal to all non-fault lines capacitance current over the ground it
With, its direction is flowed to bus by circuit, contrary with non-fault line.
Step S3, fault simulation signal by analog signal output board Output simulation；
Emulating instrument, by being exported by analog signal output board GTAO after the voltage-current relationship analog simulation described in step 2, is sent
In power amplifier.
Analogue signal is amplified by step S4, power amplifier:
It is amplified after receiving the analogue signal that step 3 is sent here by power amplifier, this amplifier can realize three-phase current,
Voltage signal amplifies output without phase angle difference.
Step S5, will amplify after signal send into three-phase windings:
After the analogue signal of step 4 is amplified, this analogue signal is admitted in three-phase windings.
Step S6, online earth fault alarm device sense three-phase windings electric quantity change and automatically gather:
Online earth fault alarm device detects in three-phase windings and is automatically acquired and record after the change of the signal of telecommunication, then
Send the information of record to monitoring unit.
Step S7 to, by wireless transmissioning mode the signal collected sent computer:
Online earth fault alarm device transfers data to the computer for analyzing contrast by wireless network.
The signal received is contrasted by step S8, computer with simulated fault signal:
After computer receives the signal that the transmission of online earth fault alarm device comes, signal and the simulated fault phase that will receive
Contrast, if the fault phase that online earth fault alarm device sends is identical with the fault phase of emulation, it was demonstrated that this connects online
Earth fault alarm device can normally work, otherwise this device of surface existing problems.
Step S9, complete the detection of online earth fault alarm device.
Online earth fault alarm device singlephase earth fault conventional in present power distribution network can be reported to the police and be positioned by the present invention
Function accurately detects, to the online earth fault alarm device tool using distinct methods to differentiate singlephase earth fault
Versatility, the present invention is had also to have the advantages that
(1). the online earth fault alarm device that waveform requirements is strict can be carried out singlephase earth fault warning function test,
Also the singlephase earth fault warning function of the common overhead type fault detector without record wave energy can be tested.
(2). having multichannel power amplifier can be amplified defeated to the simulation waveform of the conventional power plant of band outgoing lines
Go out.
(3). simulate different types of earth fault, it is possible to online earth fault alarm device is carried out single-phase earthing event
The systematic testing of barrier.
(4). it is capable of the online earth fault alarm device of many sets is carried out closed loop test simultaneously, easy and simple to handle.
Claims (3)
1. the detection method to online earth fault alarm device, it is characterised in that comprise the following steps:
(1) online earth fault alarm device is installed on three-phase windings；
(2) in emulator, build model and generate different faults data according to voltage, current relationship simulation；
(3) by the fault simulation signal of analog signal output board Output simulation；
(4) analogue signal is amplified by power amplifier；
(5) signal after amplifying sends into three-phase windings；
(6) online earth fault alarm device senses three-phase windings electric quantity change and automatically gathers；
(7) signal collected is sent to computer by wireless transmissioning mode；
(8) signal received is contrasted by computer with simulated fault signal；
(9) detection of online earth fault alarm device is completed.
Method the most according to claim 1, it is characterised in that: step (2) described voltage, current relationship include trouble point
Residual voltage UK0For:Wherein, UAG、UBG、UCGIt is respectively the electricity over the ground of A, B, C three-phase
Pressure；Flow through the electric current I of trouble point kKFor:Wherein, UAG、UBG、UCG
It is respectively the voltage-to-ground of A, B, C three-phase,For the capacitance current sum relatively of A time properly functioning；When circuit is sent out
Raw fault, the electric current that healthy phases circuit top is flow through is, wherein C0IFor circuit I
The direct-to-ground capacitance of phase；The electric current flow through at faulty line top is
, wherein C0IIDirect-to-ground capacitance for circuit II phase.
Method the most according to claim 1, it is characterised in that: step (4) described power amplifier can realize three-phase current,
Voltage signal amplifies output without phase angle difference.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107169213A (en) * | 2017-05-23 | 2017-09-15 | 南方电网科学研究院有限责任公司 | Test method, the apparatus and system of zero-sequence current self-adaptive protector functional parameter |
| CN107748304A (en) * | 2017-09-23 | 2018-03-02 | 李景禄 | A kind of multifunctional ligand power network neutral earthing devices on-site calibrating method and instrument |
| CN113009402A (en) * | 2021-02-26 | 2021-06-22 | 国网湖南省电力有限公司 | Calibration method, calibration device and calibration system for arc suppression coil measurement and control system |
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| CN107169213B (en) * | 2017-05-23 | 2020-07-28 | 南方电网科学研究院有限责任公司 | Method, device and system for testing function indexes of zero-sequence current adaptive protection device |
| CN107748304A (en) * | 2017-09-23 | 2018-03-02 | 李景禄 | A kind of multifunctional ligand power network neutral earthing devices on-site calibrating method and instrument |
| CN113009402A (en) * | 2021-02-26 | 2021-06-22 | 国网湖南省电力有限公司 | Calibration method, calibration device and calibration system for arc suppression coil measurement and control system |
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Application publication date: 20161221 |