CN108320987A - A kind of novel high-voltage circuit-breaker closing protective circuit - Google Patents
A kind of novel high-voltage circuit-breaker closing protective circuit Download PDFInfo
- Publication number
- CN108320987A CN108320987A CN201810014011.3A CN201810014011A CN108320987A CN 108320987 A CN108320987 A CN 108320987A CN 201810014011 A CN201810014011 A CN 201810014011A CN 108320987 A CN108320987 A CN 108320987A
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- Prior art keywords
- switch
- energy storage
- spring
- normally
- locking relay
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention provides a kind of novel high-voltage circuit-breaker closing protective circuits, including positive and negative busbar, switch knob, scene/Remote Selection switch, gas anomaly detection switch, gas anomaly locking relay, energy storage locking relay, high-voltage circuitbreaker, the first spring travel switch, third spring travel switch and spring energy-storage motor；The power supply for the normally-closed contact control energy storage locking relay coil that present invention third spring travel switchs, after switch knob is pressed, high voltage circuit breaker closing coil charges, the spring of high-voltage circuitbreaker discharges, complete feed motion, after the completion of feed motion, the normally-closed contact of first spring travel switch is closed, energy storage motor is rotated by electricity, the spring of high-voltage circuitbreaker is restored energy storage state again again, the normally-closed contact of third spring travel switch disconnects, the coil blackout of energy storage protective relay, it ensure that the coil of energy storage locking relay will not be burnt because long-time is powered.
Description
Technical field
The present invention relates to closing protective circuit field more particularly to a kind of novel high-voltage circuit-breaker closing protective circuits.
Background technology
It is well known that block supply need to pass through high-voltage circuitbreaker QF combined floodgate power transmissions；When not closing a floodgate, the master of high-voltage circuitbreaker QF
It is pulled open by spring contact；When combined floodgate, switch knob SB1 is pressed, spring is discharged by mechanical device, pulls high-voltage circuitbreaker QF's
Main contacts is closed, external power transmission；Because of the very urgent property of power Transmission, the spring of driving high-voltage circuitbreaker QF main contacts needs one
It is directly in energy storage state, to prepare to close a floodgate next time；In order to ensure that spring is in energy storage state, it is additionally provided with the first spring travel
Switch SP1, second spring travel switch SP2 and spring energy-storage motor M are integrated on each spring travel switch normally opened and normally closed
The normally-closed contact of contact, the first spring travel switch SP1 is connected with spring energy-storage motor M；After spring releases energy retraction, bullet
The normally-closed contact of spring travel switch SP1 is closed, and spring is pulled open energy storage by the M actions of control spring energy-storage motor；But above-mentioned action
In the process, if closed a floodgate in the state of spring unstored energy, the Burnout of Closing Coil of high-voltage circuitbreaker QF will be led to, is
The appearance of the above situation, staff is avoided to devise power supply shutting-brake control as described below using energy storage locking relay 3K
Protect circuit；
As shown in Figure 1：Power supply shutting-brake control protection circuit includes positive and negative busbar, switch knob SB1, scene/Remote Selection switch
SK, gas anomaly detection switch KD, gas anomaly locking relay 2K, energy storage locking relay 3K, high-voltage circuitbreaker QF, first
Spring travel switch SP1, second spring travel switch SP2 and spring energy-storage motor M；
The first end of switch knob SB1 is electrically connected with+KM, and scene/Remote Selection switch SK is single-pole double-throw switch (SPDT), switch knob
The second end of SB1 is electrically connected with the first moved end of scene/Remote Selection switch SK, and the second of scene/Remote Selection switch SK is dynamic
End is connect with remote control output end, and the non-moving end of scene/Remote Selection switch SK is normal with gas anomaly locking relay 2K's
The first end of closed contact connects, and the second end of the normally-closed contact of gas anomaly locking relay 2K is normal with energy storage locking relay
The first end connection of contact 3K1 is opened, the second end of the normally opened contact 3K1 of energy storage locking relay and the auxiliary of high-voltage circuitbreaker are touched
The first end of point DL connects, the second end of the auxiliary contact DL of high-voltage circuitbreaker and the first of the closing coil of high-voltage circuitbreaker QF
End connection, the second end of the closing coil of high-voltage circuitbreaker QF are electrically connected with negative busbar-KM；
The first end of gas anomaly detection switch KD is electrically connected with+KM, and the second end and gas of gas anomaly detection switch KD is different
The first end connection of the coil of normal locking relay 2K, second end and the negative busbar-of the coil of gas anomaly locking relay 2K
KM is electrically connected；Gas anomaly detection switch KD（Open type）For detecting the indoor arc extinguishing gases pressure of high-voltage circuitbreaker QF arc extinguishings
Power, when arc quenching gas pressure value meets electric requirement, gas anomaly detection switch KD is in off state, and high-voltage circuitbreaker QF goes out
When the indoor arc quenching gas pressure value of arc is less than electric requirement, gas anomaly locking relay 2K coil charges, the normally opened of 2K connects
Point disconnects, to be latched combined floodgate circuit.
The first end of the normally opened contact of second spring travel switch SP2 is electrically connected with positive bus-bar+KM, and second spring stroke is opened
The second end for closing the normally opened contact of SP2 is connect with the first end of the coil of energy storage locking relay 3K, energy storage locking relay 3K
The second end of coil be electrically connected with negative busbar-KM；The first end and positive bus-bar of the normally-closed contact of first spring travel switch SP1
+ KM is electrically connected, and the first spring travel switch SP1 normally-closed contacts second end is electrically connected with the input terminal of spring energy-storage motor M, spring
The output end of energy storage motor M is connect with negative busbar-KM；First spring travel switch SP1 and second spring stroke after spring release
The normally-closed contact of switch SP2 is closed, and normally opened contact disconnects, conversely, when spring is in energy storage state, the first spring travel switch
The normally-closed contact of SP1 and second spring travel switch SP2 is opened, and normally opened contact is closed.
When needing closing by hand power transmission, push the moved end of scene/Remote Selection switch SK to scene/Remote Selection switch SK
The first moved end（Select live selecting switch）, remote operation failure at this time；Conversely, when needing remote switching power transmission, will show
Push the second moved end of scene/Remote Selection switch SK in the moved end of field/Remote Selection switch SK（That is selection Remote Selection switch）,
Execute-in-place fails at this time；The action process of closing by hand power transmission will be simply introduced below；
It wants that combined floodgate power transmission can be carried out, it is necessary to ensure that the arc quenching gas pressure in circuit breaker Q F meets electric requirement first, gas is different
Normal detection switch KD open circuits, the coil of gas anomaly locking relay 2K is not charged, and gas anomaly locking relay 2K's is normally closed
Contact closure releases locking of the gas anomaly to closing circuit, and secondly spring necessarily is in the energy storage state of stretching, spring travel
The normally opened contact of switch SP3 is closed, and the coil of energy storage locking relay 3K is powered, the normally opened contact 3K1 of energy storage locking relay
It is closed, releases locking of the spring noenergy state to closing circuit, after two above condition all meets, staff presses conjunction
Lock button SB1, closing coil QF chargings, triggering high-voltage breaker spring release pull the main contact of high-voltage circuitbreaker QF to be closed,
Feed motion is completed, while the normally-closed contact DL of high-voltage circuitbreaker QF disconnects closing circuit, the closing coil of high-voltage circuitbreaker QF
Power-off；In the above process, after spring release, the normally-closed contact of the first spring travel switch SP1 is closed, and gives spring energy-storage motor M
It powers on, spring is pulled open energy storage by the M rotations of spring energy-storage motor again；In the above process, due to the line of energy storage locking relay 3K
Circle is connected with the normally opened contact of second spring travel switch SP2, therefore, if spring is in release conditions, second spring stroke
The normally opened contact of switch SP2 disconnects, and the coil of energy storage locking relay 3K is not charged, the normally opened contact of energy storage locking relay 3K
3K1 is disconnected, and has cut off closing circuit, at this point, no matter how to operate switch knob SB1, the closing coil of high-voltage circuitbreaker QF is all
It will not charge, prevent the Burnout of Closing Coil of high-voltage circuitbreaker QF.
But in above-mentioned action process, due in addition to switch knob SB1 presses, other than spring release instant of time, other
Time, spring are in energy storage state, and the normally opened contact of second spring travel switch SP2 is constantly in closed state, i.e. energy storage
The coil of locking relay 3K is constantly in electriferous state, by long-term accumulated temperature ablation, the coil of energy storage locking relay 3K
Performance gradually deteriorates, and will finally be burned out.
Invention content
The purpose of the present invention is to provide a kind of novel high-voltage circuit-breaker closing protective circuit, it can realize that spring does not have
It is latched the function of combined floodgate loop protection closing coil when energy storage, while avoiding charging frequency for a long time due to energy storage relay 3K coils again
Numerous family defect burnt.
To achieve the goals above, the present invention uses following technical scheme：
A kind of novel high-voltage circuit-breaker closing protective circuit, including positive and negative busbar, switch knob, scene/Remote Selection switch,
Gas anomaly detection switch, gas anomaly locking relay, energy storage locking relay, high-voltage circuitbreaker, the first spring travel are opened
It closes, third spring travel switchs and spring energy-storage motor；
The first end of switch knob is electrically connected with positive bus-bar, and scene/Remote Selection switch is single-pole double-throw switch (SPDT), switch knob
Second end is electrically connected with the first moved end of scene/Remote Selection switch, the second moved end and the long-range control of scene/Remote Selection switch
Output end connection processed, the first end of the non-moving end and the normally-closed contact of gas anomaly locking relay of scene/Remote Selection switch
Connection, the second end of the normally-closed contact of gas anomaly locking relay and the first end of the normally-closed contact of energy storage locking relay connect
It connects, the first end connection of the auxiliary contact of the normally closed second end and high-voltage circuitbreaker of energy storage locking relay, high-voltage circuitbreaker
The second end of auxiliary contact and the first end of closing coil of high-voltage circuitbreaker connect, the of the closing coil of high-voltage circuitbreaker
Two ends are electrically connected with negative busbar；
The first end of gas anomaly detection switch is electrically connected with positive bus-bar, the second end and gas anomaly of gas anomaly detection switch
The first end of the coil of locking relay connects, and the second end of the coil of gas anomaly locking relay is electrically connected with negative busbar；
The first end of the normally-closed contact of third spring travel switch is electrically connected with positive bus-bar, and the normally closed of third spring travel switch is touched
Point second end connect with the first end of the coil of energy storage locking relay, the second end of the coil of energy storage locking relay and bear
Busbar is electrically connected；
The first end of the normally-closed contact of first spring travel switch is electrically connected with positive bus-bar, and the normally closed of the first spring travel switch is touched
The second end of point is electrically connected with the input terminal of spring energy-storage motor, and the output end of spring energy-storage motor is connect with negative busbar.
Further include backstage protection supervisory equipment, both ends and the backstage protection observing and controlling dress of the normally opened contact of energy storage locking relay
The input terminal connection set.
Beneficial effects of the present invention：
A kind of novel high-voltage circuit-breaker closing protective circuit of the present invention, the normally-closed contact control switched with third spring travel
The power supply of energy storage locking relay coil processed, after switch knob is pressed, high voltage circuit breaker closing coil charges, high-voltage circuitbreaker
Spring discharges, completion feed motion, and after the completion of feed motion, the normally-closed contact of the first spring travel switch is closed, energy storage motor
It being rotated by electricity, the spring of high-voltage circuitbreaker is restored energy storage state again again, and the normally-closed contact of third spring travel switch disconnects,
The coil blackout of energy storage protective relay ensure that the coil of energy storage locking relay will not be burnt because long-time is powered.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the circuit theory schematic diagram of power supply closing protective circuit described in background technology；
Fig. 2 is the circuit theory schematic diagram of invention.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 2：A kind of novel high-voltage circuit-breaker QF shutting-brake controls of the present invention protect circuit, including positive bus-bar
+ KM, negative busbar-KM, switch knob SB1, scene/Remote Selection switch SK, gas anomaly detection switch KD, gas anomaly locking
Relay 2K, energy storage locking relay 3K, high-voltage circuitbreaker QF, the first spring travel switch SP1, third spring travel switch
SP3 and spring energy-storage motor M；
Positive bus-bar+the KM, negative busbar-KM provide electric energy for novel high-voltage circuit-breaker closing protective circuit；
The switch knob SB1 uses button switch；
The scene/Remote Selection switch SK uses single-pole double-throw switch (SPDT), and scene/Remote Selection switch SK is for selecting live conjunction
Lock operation mode or remote switching operation mode；
The gas anomaly detection switch KD uses open type gas anomaly detection switch, and gas anomaly detection switch KD is for examining
The indoor arc quenching gas pressure of high-voltage circuitbreaker QF arc extinguishings is surveyed, when arc quenching gas pressure value meets electric requirement, gas anomaly inspection
Slowdown monitoring switch KD is in off state, when the indoor arc quenching gas pressure value of high-voltage circuitbreaker QF arc extinguishings is less than electric requirement, gas
Abnormality detection switch KD redirects as closed state；
The gas anomaly locking relay 2K and gas anomaly detection switch KD mating protection high-voltage circuitbreaker QF, when height is broken
When the indoor arc extinguishing gases deficiency of road device QF arc extinguishings, open type gas anomaly detection switch KD redirects as closed state, and gas is different
The coil electrification of normal locking relay 2K, and then the normally-closed contact of gas anomaly locking relay 2K redirects as off state, cuts
Disconnected combined floodgate circuit, avoids the occurrence of safety accident.
The first end of switch knob SB1 is electrically connected with positive bus-bar+KM, and scene/Remote Selection switch SK opens for single-pole double throw
It closes, the second end of switch knob SB1 is electrically connected with the first moved end of scene/Remote Selection switch SK, scene/Remote Selection switch
The second moved end of SK is connect with remote control output end, the non-moving end of scene/Remote Selection switch SK and gas anomaly be latched after
The first end of the normally-closed contact of electric appliance 2K connects, and second end and the energy storage of the normally-closed contact of gas anomaly locking relay 2K are latched
The first end of the normally-closed contact of relay 3K2 connects, the normally closed second end and high-voltage circuitbreaker of energy storage locking relay 3K
Auxiliary contact DL（The auxiliary contact DL of high-voltage circuitbreaker is normally-closed contact, and auxiliary contact are used to indicate the work of high-voltage circuitbreaker QF
Make state, when not closing a floodgate, the auxiliary contact DL of high-voltage circuitbreaker is closed, and after combined floodgate, the auxiliary contact DL of high-voltage circuitbreaker is disconnected）
First end connection, the first end of the second end of the auxiliary contact DL of high-voltage circuitbreaker and the closing coil of high-voltage circuitbreaker QF connects
It connects, the second end of the closing coil of high-voltage circuitbreaker QF is electrically connected with negative busbar-KM；
The first end of gas anomaly detection switch KD is electrically connected with positive bus-bar+KM, the second end of gas anomaly detection switch KD with
The first end of the coil of gas anomaly locking relay 2K connects, the second end of the coil of gas anomaly locking relay 2K with it is negative
Busbar-KM electrical connections；
Third spring travel switch SP3（The contact of spring travel switch is determined that spring is in energy storage state by the state of spring
When, the normally-closed contact of spring travel switch disconnects, and normally opened contact is closed；Conversely, when spring is in release conditions, spring travel is opened
The normally-closed contact of pass is closed, and normally opened contact disconnects）The first end of normally-closed contact is electrically connected with positive bus-bar+KM, third spring travel
Switch SP3 normally-closed contacts second end is connect with the first end of the coil of energy storage locking relay 3K, energy storage locking relay 3K's
The second end of coil is electrically connected with negative busbar-KM；
The first end of the normally-closed contact of first spring travel switch SP1 is electrically connected with positive bus-bar+KM, the first spring travel switch
The second end of SP1 normally-closed contacts is electrically connected with the input terminal of spring energy-storage motor M, the output end of spring energy-storage motor M and negative mother
Line-KM connections.
A kind of action process of novel high-voltage circuit-breaker QF shutting-brake controls protection circuit of the present invention is：
When needing to close a floodgate, staff is by scene/Remote Selection switch SK selection operation patterns, below to execute-in-place pattern
Do simple introduction：Staff presses switch knob SB1, and the closing coil charging of high-voltage circuitbreaker QF is touched by mechanical device
Spring release is sent out, pulls the main contacts of high-voltage circuitbreaker QF to be closed, external power transmission；After spring release, the first spring travel switch
SP1 normally-closed contacts are closed, and are powered and are rotated with the concatenated spring energy-storage motor M of the first spring travel switch SP1 normally-closed contacts, by bullet
Spring is stretched as energy storage state, in case feed motion next time；After the completion of spring energy-storage, third spring travel switch SP3 is normally closed to be connect
Point disconnects, the power supply of the coil of cut-out energy storage locking relay 3K；Moment spring is in release shape only during feed motion
State, third spring travel switch SP3 normally-closed contacts are closed, the coil electrification of energy storage locking relay 3K, other times（Stable
Combined floodgate or gate-dividing state）, spring is constantly in energy storage state, and third spring travel switch SP3 normally-closed contact open circuits, energy storage is closed
The coil for locking relay 3K is not charged, prevents the coil of energy storage locking relay 3K from being burnt by long-term accumulated temperature ablation.
Preferred embodiment is：A kind of novel high-voltage circuit-breaker QF shutting-brake controls protection circuit of the present invention further includes backstage
The both ends of protection supervisory equipment, the normally opened contact of energy storage locking relay 3K are connect with the input terminal of backstage protection supervisory equipment,
Backstage protection supervisory equipment is used to acquire the status information of the normally opened contact of energy storage locking relay 3K, and then judges high pressure open circuit
The status information of device QF springs；From aforementioned activities process：When the spring of high-voltage circuitbreaker QF is in release conditions, with third
The coil of the concatenated energy storage locking relay 3K of spring travel switch SP3 normally-closed contacts is powered, and energy storage locking relay 3K's is normal
It opens contact and will redirect as closed state, backstage protection supervisory equipment will acquire the closure of the normally opened contact of energy storage locking relay 3K
Information, and show that spring is in release conditions, and remote control is prevented to close a floodgate the execution ordered to protect closing coil；Conversely,
Backstage protection supervisory equipment will acquire the disconnection information of the normally opened contact of energy storage locking relay 3K, and show that spring is in energy storage
State, release locking of the backstage protective device to remote control combined floodgate order.
In actual operation, multipair normally opened contact and normally-closed contact, spring travel are integrated on energy storage locking relay 3K
Also multipair normally opened/normally closed two groups of contacts are integrated on switch；To existing shutting-brake control protection circuit be transformed when, only need by
The normally opened contact of energy storage locking relay 3K in the former closing protective circuit of access is changed to normally-closed contact, will be accessed in background technology
The normally opened contact of second spring travel switch SP2 in former closing protective circuit is changed to normally-closed contact and can be completed change circuit
It makes, it is convenient and practical, convenient for promoting.
A kind of novel high-voltage circuit-breaker closing protective circuit of the present invention, by energy storage locking relay 3K normally-closed contacts
Access closing circuit realizes blocking function when spring is in release conditions, and the moment that switch knob SB1 is pressed, closing coil fills
Electricity, the spring release of triggering high-voltage circuitbreaker QF pull high-voltage circuitbreaker QF main contacts to be closed and complete feed motion, spring release
Afterwards, the first spring travel switch SP1 normally-closed contacts are closed, energy storage motor M rotations, and the spring of high-voltage circuitbreaker QF is again by energy storage electricity
Machine M is pulled open, and restores energy storage state again, and third spring travel switch SP3 normally-closed contacts disconnect, the line of energy storage locking relay 3K
Circle power-off ensure that the coil of energy storage locking relay 3K will not be burnt because long-time is powered.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (2)
1. a kind of novel high-voltage circuit-breaker closing protective circuit, it is characterised in that：Including positive and negative busbar, switch knob, scene/
Remote Selection switch, gas anomaly detection switch, gas anomaly locking relay, energy storage locking relay, high-voltage circuitbreaker,
One spring travel switch, third spring travel switch and spring energy-storage motor；
The first end of switch knob is electrically connected with positive bus-bar, and scene/Remote Selection switch is single-pole double-throw switch (SPDT), switch knob
Second end is electrically connected with the first moved end of scene/Remote Selection switch, the second moved end and the long-range control of scene/Remote Selection switch
Output end connection processed, the first end of the non-moving end and the normally-closed contact of gas anomaly locking relay of scene/Remote Selection switch
Connection, the second end of the normally-closed contact of gas anomaly locking relay and the first end of the normally-closed contact of energy storage locking relay connect
It connects, the first end connection of the auxiliary contact of the normally closed second end and high-voltage circuitbreaker of energy storage locking relay, high-voltage circuitbreaker
The second end of auxiliary contact and the first end of closing coil of high-voltage circuitbreaker connect, the of the closing coil of high-voltage circuitbreaker
Two ends are electrically connected with negative busbar；
The first end of gas anomaly detection switch is electrically connected with positive bus-bar, the second end and gas anomaly of gas anomaly detection switch
The first end of the coil of locking relay connects, and the second end of the coil of gas anomaly locking relay is electrically connected with negative busbar；
The first end of the normally-closed contact of third spring travel switch is electrically connected with positive bus-bar, and the normally closed of third spring travel switch is touched
Point second end connect with the first end of the coil of energy storage locking relay, the second end of the coil of energy storage locking relay and bear
Busbar is electrically connected；
The first end of the normally-closed contact of first spring travel switch is electrically connected with positive bus-bar, and the normally closed of the first spring travel switch is touched
The second end of point is electrically connected with the input terminal of spring energy-storage motor, and the output end of spring energy-storage motor is connect with negative busbar.
2. a kind of novel high-voltage circuit-breaker closing protective circuit according to claim 1, it is characterised in that：It further include backstage
The both ends of protection supervisory equipment, the normally opened contact of energy storage locking relay are connect with the input terminal of backstage protection supervisory equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810014011.3A CN108320987A (en) | 2018-01-08 | 2018-01-08 | A kind of novel high-voltage circuit-breaker closing protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810014011.3A CN108320987A (en) | 2018-01-08 | 2018-01-08 | A kind of novel high-voltage circuit-breaker closing protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108320987A true CN108320987A (en) | 2018-07-24 |
Family
ID=62893102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810014011.3A Pending CN108320987A (en) | 2018-01-08 | 2018-01-08 | A kind of novel high-voltage circuit-breaker closing protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108320987A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264955A (en) * | 2021-12-13 | 2022-04-01 | 广东电网有限责任公司 | Simple and easy self-checking device of energy storage motor |
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| CN114264955A (en) * | 2021-12-13 | 2022-04-01 | 广东电网有限责任公司 | Simple and easy self-checking device of energy storage motor |
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