CN107678478A - Voltage transformer secondary neutral point valve block Working Status Monitoring circuit and method - Google Patents
Voltage transformer secondary neutral point valve block Working Status Monitoring circuit and method Download PDFInfo
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- CN107678478A CN107678478A CN201711004290.7A CN201711004290A CN107678478A CN 107678478 A CN107678478 A CN 107678478A CN 201711004290 A CN201711004290 A CN 201711004290A CN 107678478 A CN107678478 A CN 107678478A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
The invention discloses a kind of voltage transformer secondary neutral point valve block Working Status Monitoring circuit and method, avoids the generation of the breakdown phenomenon of secondary valve block grounding phenomenon and Secondary Circuit of Potential Transformer insulation.Including voltage transformer（1）, the small bus one point earth points of control room N600（3）, AC relay, DC relay, main zinc oxide valve plate（7）, standby zinc oxide valve plate（9）, DC supply（11）With alarm signal generating loop（15）, in voltage transformer（1）Secondary winding on be connected with protection circuit（2）, voltage transformer（1）Secondary winding neutral point N（4）Pass through the small bus Special-purpose connecting lines of N600（5）With the small bus one point earth points of control room N600（3）Electrical connection, by the combination of AC relay and DC relay normally opened contact and normally-closed contact, realizes the switching of main zinc oxide valve plate 7 and standby zinc oxide valve plate 9.Reduce the probability of happening of protective relaying maloperation and the power grid accident of tripping.
Description
Technical field
It is more particularly to a kind of to ensure voltage transformer secondary the present invention relates to a kind of secondary circuit of utility voltage transformer
The control circuit and control method for the zinc oxide valve plate normal work that the neutral point in loop is connect, so as to avoid voltage transformer two
The neutral point of minor loop occurs the generation of or multipoint earthing phenomenon at 2 points.
Background technology
According to pertinent regulations：The secondary circuit of utility voltage transformer only allows have one point earth in control room, oneself
The secondary coil of voltage transformer of control room one point earth, it is necessary in switch yard by secondary coil neutral point through discharging gap or oxygen
Change zinc valve block ground connection, its breakdown voltage peak value should be greater than 30Imax volts.Discharging gap or zinc oxide valve plate should be inspected periodically,
Prevent from causing the phenomenon of voltage secondary circuit multipoint earthing.In transformer station or power plant, utility voltage transformer secondary winding
Loop must only have an earth point, and the main function of ground connection has two：One is to prevent high voltage from sealing in low tension loop
Cause the harm of the person and equipment；Another is the reference point as the secondary device operating voltage such as relay protection, observing and controlling.
In existing utility voltage transformer, the secondary windings of PT neutral point of secondary circuit protection device is to pass through control
N600 small buses in room are connected what is be grounded with the small bus one point earth points of control room N600；The voltage transformer secondary of measure and control device
Winding neutral point is also connected what is be grounded by the small buses of control room N600 with the small bus one point earth points of control room N600,
So it is achieved that multiple secondary windings of utility voltage transformer jointly in the requirement of control room one point earth.
, may in substation ground network when power-frequency earthing failure occurring in transformer station or lightning impulse transferring over-voltage is invaded
Injection very big power frequency short circuit current or lightning current, now the transient state of grounding net of transformer substation point-to-point transmission or steady state potential difference can be non-
Chang Gao, in some instances it may even be possible to more than the resistance to voltage levels of secondary windings of PT neutral point, so as to secondary winding neutral point insulation
Constitute threat.Therefore, in order to prevent this overvoltage phenomenon, designed on each secondary winding neutral point of voltage transformer
Discharging gap or zinc oxide valve plate have been accessed, preferably to protect the insulation of neutral point.This design protects neutrality well
Point, but the following problem be present,（1）The normally breakdown or due to when quality problems mistakenly hit is worn of discharging gap or zinc oxide valve plate,
The neutral point of Secondary Circuit of Potential Transformer can be caused the phenomenon of two points ground fault or multipoint earthing occur, now when in transformer station
During the serious earth fault of generation, an additional residual voltage certainly will be superimposed in relay protection operating voltage loop so that after
The voltage phase angle amplitude that electrical protective device is experienced is incorrect, will necessarily increase the risk of relay protection device malfunction and misaction.
（2）Discharging gap or zinc oxide valve plate belong to the overvoltage protection device of pure physics mode, and its outward appearance is closed porcelain vase, and itself does not have
There is electronic logic formula to gather and supervisory circuit, so fortune inspection personnel are on the spot or a distant place does not observe its running status, also
It is that the working condition for saying discharging gap or zinc oxide valve plate works in the state of monitoring in real time is lost completely, in addition,
The breakdown working value discreteness of discharging gap or zinc oxide valve plate is larger, and component reliability is relatively low, easily damages；Once element damages
It is bad, it is possible to cause Secondary Circuit of Potential Transformer system in transformer station to be chronically at or multipoint earthing situation at 2 points, to relay
Protection equipment buries very big potential safety hazard.（3）For double bus scheme mode, each public busbar voltage of interval secondary equipment
During the situation of transformer, its discharging gap configured or zinc oxide valve plate are also to be worked on common return, even if there is some
Carry out interruption maintenance out of service is spaced, but is spaced due to other also in running status, thus the maintenance of oxidizing zinc valve block
Work brings bigger difficulty and risk.
The content of the invention
The invention provides a kind of voltage transformer secondary neutral point zinc oxide valve plate Working Status Monitoring circuit and monitoring
Method, avoid secondary oxidation zinc valve block it is breakdown and caused by 2 points or multipoint earthing phenomenon generation.
The present invention is that solve above technical problem by the following technical programs：
A kind of voltage transformer secondary neutral point zinc oxide valve plate Working Status Monitoring circuit, including voltage transformer, control room
The small bus one point earth points of N600, AC relay, weight motor type relay, main zinc oxide valve plate, standby zinc oxide valve plate, the time after
Circuit occurs for electrical equipment, D.C. contactor, involution button, DC supply and alarm signal, voltage transformer it is secondary around
Monitoring, control switching circuit are connected with group, the secondary winding neutral point N of voltage transformer passes through the special connection of the small buses of N600
Line is linked together with the small bus one point earth points of control room N600, and AC relay is connected with secondary winding neutral point N
Coil, the other end of the coil of AC relay passes through one end of main zinc oxide valve plate and the normally-closed contact of D.C. contactor and connects
It is connected together, the other end and the secondary earth point in switch yard power distribution cabinet of normally-closed contact link together, the line of AC relay
One end of normally opened contact and standby zinc oxide valve plate that the other end of circle passes through D.C. contactor links together, standby zinc oxide
The other end of valve block links together with secondary earth point in switch yard power distribution cabinet；AC relay normally opened contact is with moving relay again
It is connected in parallel on after the series connection of device potential winding between the positive and negative polarities of DC supply, weight motor type relay normally opened contact, moves relay again
Device current coil, time relay coil and can involution button be sequentially connected in series after be connected in parallel on DC supply positive and negative polarities it
Between, time relay output timing closing contact is connected in parallel on the positive and negative of DC supply after being connected with the coil of D.C. contactor
Between the two poles of the earth.
The second output time closing contact of the time relay is in series with circuit occurs for alarm signal.
A kind of voltage transformer secondary neutral point zinc oxide valve plate instrument operating condition monitoring method, comprises the following steps：
The first step, the secondary winding neutral point N of voltage transformer are small by the small bus Special-purpose connecting lines of N600 and control room N600
Bus one point earth point is linked together, and the coil of AC relay is connected on secondary winding neutral point N, AC relay
The other end of coil is linked together by one end of main zinc oxide valve plate and the normally-closed contact of D.C. contactor, normally-closed contact
The other end is linked together with secondary earth point in switch yard power distribution cabinet, and the other end of the coil of AC relay is connect by direct current
One end of the normally opened contact of tentaculum and standby zinc oxide valve plate links together, the other end and switch yard of standby zinc oxide valve plate
Secondary earth point links together in power distribution cabinet；AC relay normally opened contact is in parallel after being connected with weight motor type relay potential winding
Between the positive and negative polarities of DC supply, weight motor type relay normally opened contact, weight motor type relay current coil, the time relay
Coil and can involution button be sequentially connected in series after be connected in parallel between the positive and negative polarities of DC supply, the time relay output delay
Closure contact is connected in parallel between the positive and negative polarities of DC supply after being connected with the coil of D.C. contactor；Sent out in alarm signal
Second output time closing contact of the series connection time relay in raw circuit；
Second step, when there is the overvoltage level for jeopardizing neutral point insulation in secondary winding neutral point N, main zinc oxide valve plate is hit
Wear, when main zinc oxide valve plate breakdown current is more than 30 MAHs, the electric current that the coil of AC relay also there are 30 milliamperes flows through, and hands over
Current relay normally opened contact closes, and weight motor type relay potential winding obtains electric, makes weight motor type relay normally opened contact closure, make the time after
Electric apparatus coil obtains the second output time closing contact that is electric, then making time relay output timing closing contact and the time relay
Timing closing simultaneously, the coil of D.C. contactor is obtained electric, open the normally-closed contact of D.C. contactor, and make D.C. contactor
Normally opened contact closure, alarm signal generating loop sends alarm signal；
If the 3rd step, check that main zinc oxide valve plate can correctly return to normal condition after breakdown, you can involution button is pressed, when
Between relay coil dead electricity, time relay output timing closing contact is opened, makes the coil losing electricity of D.C. contactor, make direct current
The normally-closed contact closure of contactor, and the normally opened contact of D.C. contactor is opened, so as to recover the normal of main zinc oxide valve plate
Operation monitoring controls working condition.
It is right under operation by the switch operating of active and standby zinc oxide valve plate when main zinc oxide valve plate has action
Zinc oxide valve plate, which is overhauled more to change jobs, provides possibility, greatly reduces protective relaying maloperation and the power grid accident of tripping
Probability of happening.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings：
A kind of voltage transformer secondary neutral point zinc oxide valve plate Working Status Monitoring circuit, including voltage transformer 1, control room
It is the small bus one point earth points 3 of N600, AC relay 6, weight motor type relay 12, main zinc oxide valve plate 7, D.C. contactor 8, standby
Zinc oxide valve plate 9, DC supply 11 and alarm signal generating loop 15, are connected in the secondary winding of voltage transformer 1
There is protection circuit 2, the secondary winding neutral point N4 of voltage transformer 1 passes through the small bus Special-purpose connecting lines 5 of N600 and control room
The small bus one point earth points 3 of N600 are linked together, and the coil 6 of AC relay is connected with secondary winding neutral point N4,
The other end of the coil 6 of AC relay is connected by main zinc oxide valve plate 7 with the normally-closed contact 8-1 of D.C. contactor one end
Together, the normally-closed contact 8-1 other end links together with secondary earth point 10 in switch yard power distribution cabinet, AC relay
Normally opened contact 8-2 and standby zinc oxide valve plate 9 that the other end of coil 6 passes through D.C. contactor one end link together, standby
Linked together with the other end and secondary earth point 10 in switch yard power distribution cabinet of zinc oxide valve plate 9；AC relay is normally opened to be touched
Between point 6-1 is connected in parallel on the positive and negative polarities of DC supply 11 after being connected with weight motor type relay potential winding 12-1, again move after
Electrical equipment normally opened contact 12-3, weight motor type relay current coil 12-2, time relay coil 13 and can involution button 14 go here and there successively
It is connected in parallel on after connection between the positive and negative polarities of DC supply 11, time relay output timing closing contact 13-1 connects with direct current
The coil 8 of tentaculum is connected in parallel between the positive and negative polarities of DC supply 11 after connecting.
The second output time closing contact 13-2 of the time relay is in series with circuit 15 occurs for alarm signal.
A kind of voltage transformer secondary neutral point zinc oxide valve plate instrument operating condition monitoring method, comprises the following steps：
The first step, the secondary winding neutral point N4 of voltage transformer 1 pass through the small bus Special-purpose connecting lines 5 of N600 and control room N600
Small bus one point earth point 3 is electrically connected, and the coil 6 of AC relay, exchange are connected on secondary winding neutral point N4
The other end of the coil 6 of relay is connected to one by main zinc oxide valve plate 7 and the normally-closed contact 8-1 of D.C. contactor one end
Rise, the normally-closed contact 8-1 other end links together with secondary earth point 10 in switch yard power distribution cabinet, the coil of AC relay
Normally opened contact 8-2 and standby zinc oxide valve plate 9 that 6 other end passes through D.C. contactor one end link together, standby oxygen
The other end for changing zinc valve block 9 links together with secondary earth point 10 in switch yard power distribution cabinet；AC relay normally opened contact 6-1
Between being connected in parallel on the positive and negative polarities of DC supply 11 after being connected with weight motor type relay potential winding 12-1, weight motor type relay is normal
Open contact 12-3, weight motor type relay current coil 12-2, time relay coil 13 and can involution button 14 be sequentially connected in series after simultaneously
It is associated between the positive and negative polarities of DC supply 11, time relay output timing closing contact 13-1 and D.C. contactor
Coil 8 is connected in parallel between the positive and negative polarities of DC supply 11 after connecting；Occur to connect the time in circuit 15 in alarm signal
Second output time closing contact 13-2 of relay；
Second step, when there is the overvoltage level for jeopardizing neutral point insulation in secondary winding neutral point N4, the main quilt of zinc oxide valve plate 7
Breakdown, when the main breakdown current of zinc oxide valve plate 7 is more than 30 MAHs, the coil 6 of AC relay also has 30 milliamperes of electric current stream
Cross, AC relay normally opened contact 6-1 closures, motor type relay potential winding 12-1 is obtained electric again, makes weight motor type relay normally opened contact
12-3 is closed, and obtains time relay coil 13 electric, then makes time relay output timing closing contact 13-1 and time relay
Second output time closing contact 13-2 timing closings simultaneously of device, make the coil 8 of D.C. contactor must be electric, make D.C. contactor
Normally-closed contact 8-1 open, and the normally opened contact 8-2 of D.C. contactor close, alarm signal generation circuit 15 sends alarm
Signal；
If the 3rd step, check that the main working condition of zinc oxide valve plate 7 is intact, you can press involution button 14, time relay coil
13 dead electricity, time relay output timing closing contact 13-1 are opened, are made the dead electricity of coil 8 of D.C. contactor, contact direct current
The normally-closed contact 8-1 closures of device, and the normally opened contact 8-2 of D.C. contactor is opened, so as to recover main zinc oxide valve plate 6 just
Often operation working condition.
I.e. when main 7 breakdown process of zinc oxide valve plate occurs, even if there is the process that breakdown current is less than 30 MAHs, weight
Motor type relay current coil 12-2 can also remember simultaneously this process of self-sustaining.The effect of the time relay is can to set monitoring hair
Letter alarm and the Deal with Time of active and standby zinc oxide valve plate switch operating, when considering zinc oxide valve plate breakdown process during various overvoltage
Between nonlinear situation, setting time pull up time definite value of the present invention be 8 seconds.The time relay exports timing closing
Contact 13-2 is connected to alarm signal and occurred in circuit 15, and fortune inspection personnel can carry according to alarm signal fast positioning operating position
Show that operation maintenance personnel checks the integrity of main zinc oxide valve plate 7 as early as possible, if it find that main zinc oxide valve plate 7 has exception, it is possible to
Change in time.Time relay output timing closing contact 13-1 is used to start D.C. contactor 8, and it is dynamic to start D.C. contactor 8
After work, D.C. contactor output normally-closed contact 8-1 disconnects, by main 7 state out of service of zinc oxide valve plate, D.C. contactor output
Normally opened contact 8-2 is closed, and standby zinc oxide valve plate 9 is put into operation state, realizes main zinc oxide valve plate 7 and standby zinc oxide valve
The switch operating process of piece 9, it is ensured that secondary circuit is not in the phenomenon of 2 points or multipoint earthing longtime running.
Claims (3)
1. a kind of voltage transformer secondary neutral point valve block Working Status Monitoring circuit, including voltage transformer（1）, control room
The small bus one point earth points of N600（3）, AC relay（6）, weight motor type relay（12）, main zinc oxide valve plate（7）, direct current contact
Device（8）, standby zinc oxide valve plate（9）, DC supply（11）With alarm signal generating loop（15）, in voltage transformer
（1）Secondary winding on be connected with protection circuit（2）, it is characterised in that voltage transformer（1）Secondary winding neutral point N（4）
Pass through the small bus Special-purpose connecting lines of N600（5）With the small bus one point earth points of control room N600（3）Link together, it is secondary around
Group neutral point N（4）On be connected with the coil of AC relay（6）, the coil of AC relay（6）The other end pass through main oxidation
Zinc valve block（7）With the normally-closed contact of D.C. contactor（8-1）One end link together, normally-closed contact（8-1）The other end with
Secondary earth point in switch yard power distribution cabinet（10）Link together, the coil of AC relay（6）The other end connect by direct current
The normally opened contact of tentaculum（8-2）With standby zinc oxide valve plate（9）One end link together, standby zinc oxide valve plate（9）It is another
One end and secondary earth point in switch yard power distribution cabinet（10）Link together；AC relay normally opened contact（6-1）With again move after
Electrical voltage coil（12-1）DC supply is connected in parallel on after series connection（11）Positive and negative polarities between, weight motor type relay it is normally opened touch
Point（12-3）, weight motor type relay current coil（12-2）, time relay coil（13）With can involution button（14）It is sequentially connected in series
After be connected in parallel on DC supply（11）Positive and negative polarities between, time relay output timing closing contact（13-1）With direct current
The coil of contactor（8）DC supply is connected in parallel on after series connection（11）Positive and negative polarities between.
2. a kind of voltage transformer secondary neutral point valve block Working Status Monitoring circuit according to claim 1, its feature
It is, circuit occurs in alarm signal（15）In be in series with the time relay second output time closing contact（13-2）.
3. a kind of voltage transformer secondary neutral point zinc oxide valve plate instrument operating condition monitoring method, comprises the following steps：
The first step, voltage transformer（1）Secondary winding neutral point N（4）Pass through the small bus Special-purpose connecting lines of N600（5）With control
The small bus one point earth points of room N600（3）It is electrically connected, in secondary winding neutral point N（4）Upper connection AC relay
Coil（6）, the coil of AC relay（6）The other end pass through main zinc oxide valve plate（7）With the normally-closed contact of D.C. contactor
（8-1）One end link together, normally-closed contact（8-1）The other end and switch yard power distribution cabinet in secondary earth point（10）Connection
Together, the coil of AC relay（6）The other end normally opened contact that passes through D.C. contactor（8-2）With standby zinc oxide valve
Piece（9）One end link together, standby zinc oxide valve plate（9）The other end and switch yard power distribution cabinet in secondary earth point（10）
Link together；AC relay normally opened contact（6-1）With weight motor type relay potential winding（12-1）Direct current is connected in parallel on after series connection
Working power（11）Positive and negative polarities between, weight motor type relay normally opened contact（12-3）, weight motor type relay current coil（12-2）、
Time relay coil（13）With can involution button（14）DC supply is connected in parallel on after being sequentially connected in series（11）Positive and negative polarities
Between, time relay output timing closing contact（13-1）With the coil of D.C. contactor（8）Direct current work is connected in parallel on after series connection
Make power supply（11）Positive and negative polarities between；Circuit occurs in alarm signal（15）Second output delay of the middle series connection time relay
Circuit-closing contacts（13-2）；
Second step, when there is the overvoltage level for jeopardizing neutral point insulation in secondary winding neutral point N4, main zinc oxide valve plate（7）
It is breakdown, when main zinc oxide valve plate（7）Breakdown current is more than 30 MAHs, the coil of AC relay（6）Also there are 30 milliamperes
Electric current flows through, AC relay normally opened contact（6-1）Closure, weight motor type relay potential winding（12-1）Must be electric, make to move relay again
Device normally opened contact（12-3）Closure, makes time relay coil（13）Must be electric, then make time relay output timing closing contact
（13-1）Time closing contact is exported with the second of the time relay（13-2）Timing closing simultaneously, make the coil of D.C. contactor
（8）Must be electric, make the normally-closed contact of D.C. contactor（8-1）Open, and make the normally opened contact of D.C. contactor（8-2）Closure, report
Alert signal generating circuit（15）Send alarm signal；
If the 3rd step, check main zinc oxide valve plate（7）Working condition is intact, you can presses involution button（14）, the time relay
Coil（13）Dead electricity, time relay output timing closing contact（13-1）Open, make the coil of D.C. contactor（8）Dead electricity,
Make the normally-closed contact of D.C. contactor（8-1）Closure, and make the normally opened contact of D.C. contactor（8-2）Open, so as to recover main
Zinc oxide valve plate（6）Normal operation working condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711004290.7A CN107678478B (en) | 2017-10-24 | 2017-10-24 | Circuit and method for monitoring working state of secondary neutral point valve plate of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711004290.7A CN107678478B (en) | 2017-10-24 | 2017-10-24 | Circuit and method for monitoring working state of secondary neutral point valve plate of voltage transformer |
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| Publication Number | Publication Date |
|---|---|
| CN107678478A true CN107678478A (en) | 2018-02-09 |
| CN107678478B CN107678478B (en) | 2023-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711004290.7A Active CN107678478B (en) | 2017-10-24 | 2017-10-24 | Circuit and method for monitoring working state of secondary neutral point valve plate of voltage transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196345A (en) * | 2019-07-09 | 2019-09-03 | 国网宁夏电力有限公司宁东供电公司 | Voltage transformer secondary neutral point protecting device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203895978U (en) * | 2014-05-22 | 2014-10-22 | 姜谷兵 | Neutral ground protection system used for medium-voltage power grid |
| CN204012678U (en) * | 2014-07-01 | 2014-12-10 | 广东电网公司佛山供电局 | A kind of power distribution network multimode ground protection system |
| WO2017016361A1 (en) * | 2015-07-29 | 2017-02-02 | 王富元 | Online monitoring method for resistive leakage current of metal-oxide-varistor lightning arrester or surge protection device |
| CN207397148U (en) * | 2017-10-24 | 2018-05-22 | 国网山西省电力公司电力科学研究院 | Voltage transformer secondary neutral point valve block Working Status Monitoring circuit |
-
2017
- 2017-10-24 CN CN201711004290.7A patent/CN107678478B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203895978U (en) * | 2014-05-22 | 2014-10-22 | 姜谷兵 | Neutral ground protection system used for medium-voltage power grid |
| CN204012678U (en) * | 2014-07-01 | 2014-12-10 | 广东电网公司佛山供电局 | A kind of power distribution network multimode ground protection system |
| WO2017016361A1 (en) * | 2015-07-29 | 2017-02-02 | 王富元 | Online monitoring method for resistive leakage current of metal-oxide-varistor lightning arrester or surge protection device |
| CN207397148U (en) * | 2017-10-24 | 2018-05-22 | 国网山西省电力公司电力科学研究院 | Voltage transformer secondary neutral point valve block Working Status Monitoring circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196345A (en) * | 2019-07-09 | 2019-09-03 | 国网宁夏电力有限公司宁东供电公司 | Voltage transformer secondary neutral point protecting device |
| CN110196345B (en) * | 2019-07-09 | 2024-06-04 | 国网宁夏电力有限公司宁东供电公司 | Secondary neutral point protection device of voltage transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107678478B (en) | 2023-04-25 |
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