CN109861186A - A kind of 10kV arcing ground controllable device - Google Patents
A kind of 10kV arcing ground controllable device Download PDFInfo
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Abstract
The present invention relates to a kind of 10kV arcing ground controllable devices, including controller, control the orderly operation of whole device；The electric signal transmitted at the scene is easy to be disturbed, with optical fiber communicating optical signals；Current transformer collects the current signal of 10kV power distribution network Earth Phase；Voltage transformer acquires the voltage signal of 10kV power distribution network Earth Phase；Arcing ground occurs for a pair of of ball-type electrode, 10kV power distribution network Earth Phase, is used to electrion；Arc initiation device makes the single-phase generation arcing ground on 10kV power distribution network；Arc-control device is generated magnetic field force in control circuit using blowout coil and blows down electric arc, is then allowed to cool to extinguish electric arc by arc extinguishing grid separator plate；Photosensitive detection detects on ball-type electrode whether striking is successful.The device can accomplish small current neutral grounding phenomenon actual reproduction, the fault location performance test to the single-phase grounding fault positioning built up, and the Acceptance Test etc. to newly-built single-phase grounding fault positioning.
Description
Technical field
The present invention relates to a kind of 10kV power distribution network arcing ground controllable device more particularly to one kind can truly realize it is small
The device of current earthing.
Background technique
With the rapid development of society, demand of the people to electric power is growing, while needing to meet higher power supply matter
The requirement of amount.The relationship of user and power distribution network is properer in the power system, closer.Power distribution network is born directly as vast electricity
Therefore the responsibility of power customer power supply is wanted fast and effeciently find, cut off failure after breaking down, fast recovery of power supply is protected
The high quality for hindering power supply, reduces the influence of vast power consumer electricity consumption.
Two kinds of earthing modes that China mainly takes in power distribution network are first is that neutral point effective grounding mode i.e. neutral
Point is directly grounded or is grounded through Low ESR, referred to as heavy current grounding system, second is that neutral non-effective grounding mode, that is, not
It is directly grounded, through grounding through arc or through the method for operation of high resistance grounding, as small current neutral grounding system.China 3~
Most of 66kV electric system uses neutral non-effective grounding mode, therefore the system occurs to be at most single-phase earthing event
Barrier, accounts for about 80% of total failare or so.Because of the insulation defect of equipment, operation, thunder and lightning and filth in isolated neutral system
Etc. reasons occur single-phase earthing when the overwhelming majority be all to be grounded with electrical arc.Singlephase earth fault positioning difficulty is larger, and
If singlephase earth fault cannot be handled in time, it is possible to cause line to line fault ground fault.Currently, having there is a large amount of be directed to match
The device of electric network single-phase earth fault route selection and the device of fault location are installed and are applied in power distribution network, substantially by long-term
Singlephase earth fault generation is waited just to be able to verify that its positioning performance, so that fault line selection and fault locating device defect is difficult to early detection
And solution.
Summary of the invention
The purpose of the present invention is to provide a kind of 10kV arcing ground controllable devices, are real to solve the above technical problems
Existing above-mentioned purpose the invention adopts the following technical scheme:
A kind of 10kV arcing ground controllable device, comprising:
Voltage transformer, for acquiring the voltage signal on 10kV power distribution network, by controller implementing phase it is adjustable and
Angle control arc initiation device carrys out striking；
Current transformer, the current signal for getting from the phase on 10kV route send controller to；
Controller is the center for handling information, orders for issuing, maintains the operation of whole system；
Arc initiation device makes the single-phase generation arcing ground on 10kV power distribution network, causes single-phase earthing；It is transmitted and is controlled by optical fiber
System order realizes electric discharge to high pressure generator, by specified requirement, to reach a pair of of the ball-type electrode connect on 10kV power distribution network
The success striking under specified order；
Arc-control device is generated magnetic field force in control circuit using blowout coil and blows down electric arc, passes through optical cable with controller
Then communicating optical signals pass through arc extinguishing grid separator plate and are allowed to cool the electric arc realized and extinguished on ball-type electrode；
Optical fiber control, including optical fiber transceiving circuit, optical fiber transceiving circuit are transmitted through optical fiber to arc initiation device and arc-control device
Optical signal removes the electric arc to ignite on ball-type electrode to control high pressure generator；
Photosensitive detector is placed on ball-type electrode using photosensitive probe, and the brightness that the electric arc in ball gap generates triggers light
Quick probe, photosensitive control circuit transmit signal to controller, detect whether arc initiation device presses instruction electric discharge；
Ball-type electrode, the identical ball-type discharge electrode of a pair of of size, the single line on one of them power distribution network with 10kV
It is connected, another is connected with the earth, and control high pressure generator generates electric arc in the gap of a pair of of ball-type electrode, makes ball-type electrode
Gap in air ionization, the electric arc to ignite on ball-type electrode, by 10kV power distribution network this mutually with the earth be connected, cause list
Phase grounding phenomenon, realizes small current neutral grounding.
Preferably, the controller uses STM32ARM processor.
Preferably, the optical fiber transceiving circuit is formed using fiber optic emitter, fiber optic receiver, integrated logic circuit
Input signal end, control equipment, arc initiation device and arc-control device are separated, transmit signal by optical cable, prevent by optical fiber transceiving circuit
Only electromagnetic interference meets stable action request, reaches normal working condition.
Preferably, Phototube Coupling is used in the photosensitive circuit of photosensitive detector.
Preferably, the height of two switch controlled circuit output ends is used in the arc ignition control circuit of the arc initiation device
Press generator.
Preferably, the arc-control device is to use arc extinguishing control circuit, and with two switch controlleds, control object is magnetic blow-out
Coil.
Preferably, the switching tube is metal-oxide-semiconductor, and two metal-oxide-semiconductors of a branch road series connection control the logical of high pressure generators
It is disconnected, prevent interference.
Preferably, the ball-type electrode is placed in arc-extinguish chamber, and there is spray point in the inside, the electric discharge with high pressure generator
Electrode is connected, and there are also arc extinguishing grid separator plate, outsides blowout coil for the inside, connect with arc extinguishing control circuit, is powered and generates magnetic field
Power blows down the electric arc in ball gap, touches it to arc-chute and extinguishes electric arc.
Preferably, arc initiation device is identical with the control circuit of arc-control device, two input terminal N1 of arc ignition control circuit and
N2 connection controller is issued by controller and is instructed, and N1 controls optical coupling isolator O1, to determine the conducting of metal-oxide-semiconductor VT1 and cut
Only, the signal deciding optical coupling isolator O2 inputted from the end N2, and then control metal-oxide-semiconductor VT2 and be switched off and on, metal-oxide-semiconductor VT1 and
Metal-oxide-semiconductor VT2 is to be connected on branch road, controls high pressure generator, high pressure generator cannot continuous work always, here can be with
Frequency f=10Hz is set, and frequency cannot be too fast, and otherwise high pressure generator is not in electric arc, but frequency can not be too slow, no
Then influence the requirement of control discharge ball gap (gap of a pair of of ball-type electrode) striking, it is desirable that go discharge ball gap of igniting in a flash
Electric arc；
The control mode of arc extinguishing control circuit is needed to extinguish electric arc, be given by controller after discharge ball gap striking success
Signal is entered respectively from N1 and N2 input by optical coupling isolator O1 and O2 out, control respectively metal-oxide-semiconductor VT1 and VT2 open and
It closes, here the difference is that not needing the closing and open-minded, control object of intermittent control concatenated two metal-oxide-semiconductors VT1 and VT2
Also different.After metal-oxide-semiconductor VT1 is connected with VT2, the line wound on blowout coil has electric current to flow through, according to the law of electromagnetic induction,
Blowout coil can generate magnetic field, and the electric arc of discharge ball gap will receive magnetic field force and bend towards the arc extinguishing grid separator plate being made of insulation grid,
Make the reduction of its arc temperature, so as to cause electric arc disappearance, thus reaches the electric arc for extinguishing 10kV distribution network line, low current
Grounding phenomenon disappears.
Compared with prior art, the invention has the following advantages that the device can accomplish that small current neutral grounding phenomenon is practical again
It is existing, the fault location performance test to the single-phase grounding fault positioning built up, and to newly-built distribution
The Acceptance Test of net single-phase earth fault locating system provides equipment and tests environment for device fabrication producer and scientific research institutions.It is logical
The application in actual field is crossed, it can be fixed to the single-phase earth fault line selection device or singlephase earth fault installed in power distribution network
The performance of position system carries out test and verification, can find in advance there are the problem of and defect and targetedly improve,
The application process of single-phase earth fault line selection device in power distribution network is promoted, there are also the functionizations of single-phase earth fault locating system
Process, the singlephase earth fault that effectively shortens search the time, reduce the risk for causing phase fault, improve the power supply of power distribution network
Reliability, or device fabrication producer and scientific research institutions provide equipment and test environment, promote its device fabrication level, therefore
Application prospect is than broader.
Detailed description of the invention
Fig. 1 is 10kV power distribution network manually single-phase controlled arc earthed system schematic diagram；
Fig. 2 is striking and arc extinguishing control circuit schematic diagram；
Fig. 3 is photosensitive detection circuit schematic diagram；
Fig. 4 is optical fiber transceiving circuit diagram；
In attached drawing: 1 10kV distribution network line, 2 fuses, 3 disconnecting switch, 4 voltage transformers, 5 current transformers, 6 controls
Device processed, 7 arc initiation devices, 8 arc-control devices, 9 photosensitive detectors, the control of 10 optical fiber, 11 ball-type electrodes.
Specific embodiment
The present invention is further elaborated in the following with reference to the drawings and specific embodiments.
State the specific embodiment of the artificial single-phase electric arc earthing or grounding means of 10kV power distribution network with reference to the accompanying drawing.
As shown in Fig. 1,10kV power distribution network manually single-phase controlled arc earthed system schematic diagram be whole system structure
Schematic diagram；10kV distribution network line 1 successively connects with voltage transformer 4, current transformer 5 through 2 fuses 2, disconnecting switch 3 respectively
It connects；The 10kV arcing ground controllable device, comprising: voltage transformer 4 leads to for acquiring the voltage signal on 10kV power distribution network
It crosses 6 implementing phase of controller and is adjusted and carry out striking with angle control arc initiation device 7；
Current transformer 5, the current signal for getting from the phase on 10kV route send controller 6 to；
Controller 6 is the center for handling information, orders for issuing, maintains the operation of whole system；The control
Device 6 uses STM32ARM processor.
Arc initiation device 7 makes the single-phase generation arcing ground on 10kV power distribution network, causes single-phase earthing；It is transmitted by optical fiber
Control command realizes electric discharge to high pressure generator, by specified requirement, to reach a pair of of ball-type electricity connect on 10kV power distribution network
Pole success striking under specified order；Arc-control device 8 is generated magnetic field force in control circuit using blowout coil and blows down electricity
Then arc passes through arc extinguishing grid separator plate by optical cable communicating optical signals with controller 6 and is allowed to cool on realization extinguishing ball-type electrode 11
Electric arc；
The switching tube is metal-oxide-semiconductor, and the on-off of two metal-oxide-semiconductors control high pressure generators of a branch road series connection prevents
It interferes.
Arc-control device 8 realizes the electric arc extinguished on ball-type electrode 11 by optical cable communicating optical signals with controller 6；It is described
Arc-control device 8 be with arc extinguishing control circuit, with two switch controlleds, control object is blowout coil.
Optical fiber control 10, including optical fiber transceiving circuit, optical fiber transceiving circuit is through optical fiber to arc initiation device 7 and arc-control device 8
It transmits optical signal and removes the electric arc to ignite on ball-type electrode 11 to control high pressure generator；The optical fiber transceiving circuit, utilizes light
Fine transmitter, fiber optic receiver, integrated logic circuit form optical fiber transceiving circuit, and input signal end, control equipment, striking are filled
It sets and is separated with arc-control device, signal is transmitted by optical cable, electromagnetic interference is prevented, meets stable action request, reach normal
Working condition.
Photosensitive detector 9 is placed on ball-type electrode 11 using photosensitive probe, the brightness triggering that the electric arc in ball gap generates
Photosensitive probe, photosensitive control circuit transmit signal to controller 6, whether detect arc initiation device 7 by instruction electric discharge；Photosensitive detection dress
It sets and uses Phototube Coupling in 9 photosensitive circuit.
Ball-type electrode 11, the identical ball-type discharge electrode of a pair of of size, one on one of them power distribution network with 10kV
Line is connected, another is connected with the earth, and control high pressure generator generates electric arc in the gap of a pair of of ball-type electrode, keeps ball-type electric
Air ionization in the gap of pole, the electric arc to ignite on ball-type electrode, this by 10kV power distribution network are mutually connected with the earth, cause
Single-phase earthing phenomenon, realizes small current neutral grounding.The ball-type electrode 11 is placed in arc-extinguish chamber, and there is spray point in the inside,
It is connected with the discharge electrode of high pressure generator, there are also arc extinguishing grid separator plate, outsides blowout coil for the inside, with arc extinguishing control circuit
Connection, the generation magnetic field force that is powered blow down the electric arc in ball gap, touch it to arc-chute and extinguish electric arc.
Arc initiation device is all attached striking shown in Fig. 2 and arc extinguishing control electricity with the control circuit of arc-control device as being
Road.
Two input terminal N of arc ignition control circuit1And N2Controller is connected, is issued and is instructed by controller, N1Control optocoupler every
From device O1, to determine metal-oxide-semiconductor VT1On and off, from N2Hold the signal deciding optical coupling isolator O of input2, and then control
Metal-oxide-semiconductor VT2Be switched off and on.From figure 2 it can be seen that metal-oxide-semiconductor VT1With metal-oxide-semiconductor VT2It is to be connected on a branch road, control
High pressure generator.High pressure generator cannot continuous work always, frequency f=10Hz can be set here, frequency cannot be too fast, no
Then high pressure generator is not in electric arc, but frequency can not be too slow, otherwise influences control discharge ball gap (a pair of of ball-type electrode
Gap) striking requirement, it is desirable that the electric arc for discharge ball gap of going to ignite in a flash.
The circuit diagram of arc extinguishing control circuit is the same, but control mode at this moment is not identical, the striking of discharge ball gap at
It after function, needs to extinguish electric arc, signal is provided from N by controller1And N2Input is entered respectively by optical coupling isolator O1And O2,
Metal-oxide-semiconductor VT is controlled respectively1And VT2Open and close.Here intermittent concatenated two metal-oxide-semiconductors of control are not needed unlike
VT1And VT2Closing and open-minded.Control object is also different.As metal-oxide-semiconductor VT1And VT2After connection, the line that is wound on blowout coil
There is electric current to flow through, according to the law of electromagnetic induction, blowout coil can generate magnetic field, and the electric arc of discharge ball gap will receive magnetic field force and bend towards
The arc extinguishing grid separator plate being made of insulation grid makes the reduction of its arc temperature, so as to cause electric arc disappearance, has thus reached extinguishing
The electric arc of 10kV distribution network line, small current neutral grounding phenomenon disappear.
Controlled device is connect in DCV in attached drawing 22And DG2End, only as two metal-oxide-semiconductor VT1And VT2When being all connected, quilt
Control object can just be powered movement.Following table 1 is the truth table and circuit control principle of circuit control, and " 0 " represents low level, " 1 "
What is indicated is high level.
Table 1
It is obtained from table above, only as input terminal N1For low level, N2When holding input high level, optical coupling isolator O1
Conducting, optical coupling isolator O2Conducting, metal-oxide-semiconductor VT1The pole GS (gate-to-source) reach cut-in voltage, so metal-oxide-semiconductor VT1Conducting.
At this moment optical coupling isolator O2The voltage of the pole CE (collector-emitter) triode VT is not achieved3The pole BE (base-emitter)
Conducting voltage, so triode VT3Cut-off, therefore metal-oxide-semiconductor VT2The voltage of the pole GS reach cut-in voltage, metal-oxide-semiconductor VT2It leads
It is logical, control circuit output end DCV2And DG2Between have voltage.Other three kinds of situations are all DCV2And DG2End is in the shape disconnected
State, i.e. controlled device will not be powered.It is to occur signal interference in order to prevent with two switch controlled on-off, it is made to should be disconnected
The state opened and be connected.
Attached drawing 3 show photosensitive detection control circuit schematic diagram, and photosensitive probe receives under the electric arc influence of discharge ball gap, makes
Photodiode D is connected, therewith transistor VT4Conducting, optical coupling isolator O3Conducting, output end N at this moment3There is signal to be conveyed to
Controller.
Attached drawing 4 show optical fiber transceiving logic control circuit schematic diagram, and the left side is the optical fiber transmission circuit of control, and the right is
Optical receiving circuit, the following figure are the truth tables of logic control circuit.
The truth table of optical fiber sending logic circuit is following (table 2) because A connect be DC power supply anode, the shape of A
State is high level always, is indicated with " 1 ", and low level is indicated with " 0 ".
Table 2
| A | B | Y |
| 1 | 0 | 0 |
| 1 | 1 | 1 |
It as can be seen from the above table, is input terminal by the end B of NAND gate, the end Y of NAND gate is output end, when B is low level,
Y is low level, and when B is high level, Y is high level.It follows that the N of NAND gate4(end B) is held to determine the output end Y of NAND gate
State.
The truth table that optical fiber receives logic circuit is following (table 3), the input state of E and F in Fig. 4 be it is identical, all determine
Set output terminal N5Working condition.
Table 3
| E | F | N5 |
| 0 | 0 | 0 |
| 1 | 1 | 1 |
In above table, E and F input identical level signal, and when they are all low level signal, output end is also
Low level signal, when they are all high level signals, N5End output high level signal.
Striking and arc extinguishing control circuit are all by optical fiber transceiving circuit, and intermediate fiber optic emitter and fiber optic receiver connect
Optical fiber transmission optical signal is connect, experienced the process of electric signal --- optical signal --- electric signal, prevents scene to control signal
Interference.
The above is present pre-ferred embodiments, for the ordinary skill in the art, according to the present invention
Introduction, in the case where not departing from the principle of the present invention and spirit, changes, modifications, replacement and change that embodiment is carried out
Type is still fallen within protection scope of the present invention.
Claims (9)
1. a kind of 10kV arcing ground controllable device characterized by comprising voltage transformer (4), for acquiring 10kV distribution
Online voltage signal controls arc initiation device (7) with angle by the way that controller (6) implementing phase is adjustable come striking；
Current transformer (5), the current signal for getting from the phase on 10kV route send controller (6) to；
Controller (6) is the center for handling information, orders for issuing, maintains the operation of whole system；
Arc initiation device (7) makes the single-phase generation arcing ground on 10kV power distribution network, causes single-phase earthing；It is transmitted and is controlled by optical fiber
System order realizes electric discharge to high pressure generator, by specified requirement, to reach a pair of of the ball-type electrode connect on 10kV power distribution network
The success striking under specified order；
Arc-control device (8) is generated magnetic field force in control circuit using blowout coil and blows down electric arc, passes through light with controller (6)
Then cable communicating optical signals pass through arc extinguishing grid separator plate and are allowed to cool the electric arc realized and extinguished on ball-type electrode (11)；
Optical fiber control (10) includes optical fiber transceiving circuit, and optical fiber transceiving circuit is through optical fiber to arc initiation device (7) and arc-control device (8)
It transmits optical signal and removes the electric arc to ignite on ball-type electrode (11) to control high pressure generator；
Photosensitive detector (9) is placed on ball-type electrode (11) using photosensitive probe, the brightness triggering that the electric arc in ball gap generates
Photosensitive probe, photosensitive control circuit transmit signal to controller (6), whether detect arc initiation device (7) by instruction electric discharge；
Ball-type electrode (11), the identical ball-type discharge electrode of a pair of of size, the single line on one of them power distribution network with 10kV
It is connected, another is connected with the earth, and control high pressure generator generates electric arc in the gap of a pair of of ball-type electrode, makes ball-type electrode
Gap in air ionization, the electric arc to ignite on ball-type electrode, by 10kV power distribution network this mutually with the earth be connected, cause list
Phase grounding phenomenon, realizes small current neutral grounding.
2. a kind of 10kV arcing ground controllable device according to claim 1, which is characterized in that the controller (6)
Using STM32 type arm processor.
3. a kind of 10kV arcing ground controllable device according to claim 1, which is characterized in that the optical fiber transceiving circuit utilizes
Fiber optic emitter, fiber optic receiver, integrated logic circuit form optical fiber transceiving circuit, by input signal end, control equipment, striking
Device and arc-control device separate, and transmit signal by optical cable and reach normal working condition.
4. a kind of 10kV arcing ground controllable device according to claim 1, which is characterized in that photosensitive detector (9)
Photosensitive circuit in use Phototube Coupling.
5. a kind of 10kV arcing ground controllable device according to claim 1, which is characterized in that the arc initiation device
(7) high pressure generator of two switch controlled circuit output ends is used in arc ignition control circuit.
6. a kind of 10kV arcing ground controllable device according to claim 1, which is characterized in that the arc-control device
It (8) is to use arc extinguishing control circuit, with two switch controlleds, control object is blowout coil.
7. a kind of 10kV arcing ground controllable device according to claim 5 or 6, which is characterized in that the switching tube
It is metal-oxide-semiconductor, the on-off of two metal-oxide-semiconductors control high pressure generators of a branch road series connection.
8. a kind of 10kV arcing ground controllable device according to claim 1, which is characterized in that the ball-type electrode
(11) it being placed in arc-extinguish chamber, the inside has spray point, it is connected with the discharge electrode of high pressure generator, there are also arc extinguishing grid separator plate,
There is blowout coil in outside, connect with arc extinguishing control circuit, and being powered generates magnetic field force and blow down the electric arc in ball gap, touches it to going out
Arc grid extinguish electric arc.
9. a kind of 10kV arcing ground controllable device according to claim 1, which is characterized in that arc initiation device and interrupter cartridge
The control circuit set is identical, and two input terminal N1 of arc ignition control circuit connect controller with N2, is issued and is instructed by controller, N1
Optical coupling isolator O1 is controlled, thus determine the on and off of metal-oxide-semiconductor VT1, the signal deciding optical coupling isolator inputted from the end N2
O2, and then being switched off and on for metal-oxide-semiconductor VT2 is controlled, metal-oxide-semiconductor VT1 and metal-oxide-semiconductor VT2 are to be connected on a branch road, control high pressure
Generator, high pressure generator cannot continuous work, setting frequency f=10Hz, frequency cannot be too fast always, otherwise high pressure generator
It is not in electric arc, but frequency can not be too slow, otherwise influences the requirement of control discharge ball gap striking, it is desirable that in a flash
Go to ignite the electric arc of discharge ball gap；
The control mode of arc extinguishing control circuit needs to extinguish electric arc, provides letter by controller after discharge ball gap striking success
Number enter respectively to control opening and closing for metal-oxide-semiconductor VT1 and VT2 respectively by optical coupling isolator O1 and O2 from N1 and N2 input,
Unlike do not need the closing of intermittent control concatenated two metal-oxide-semiconductors VT1 and VT2 and open-minded, control object is also different, when
After metal-oxide-semiconductor VT1 is connected with VT2, the line wound on blowout coil has electric current to flow through, according to the law of electromagnetic induction, blowout coil meeting
Magnetic field is generated, the electric arc of discharge ball gap will receive magnetic field force and bend towards the arc extinguishing grid separator plate being made of insulation grid, make its electric arc temperature
Degree reduces, and so as to cause electric arc disappearance, has just reached the electric arc for extinguishing 10kV distribution network line, small current neutral grounding phenomenon disappears.
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| CN201910186872.4A CN109861186B (en) | 2019-03-13 | 2019-03-13 | 10kV electric arc grounding controllable device |
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|---|---|---|---|
| CN201910186872.4A CN109861186B (en) | 2019-03-13 | 2019-03-13 | 10kV electric arc grounding controllable device |
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| CN113671415A (en) * | 2021-10-21 | 2021-11-19 | 国网陕西省电力公司电力科学研究院 | High-voltage single-phase grounding test device and use method |
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| CN109861186B (en) | 2020-06-30 |
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