CN105490249B - Linked protector and method for transformer neutral point blocking device - Google Patents
Linked protector and method for transformer neutral point blocking device Download PDFInfo
- Publication number
- CN105490249B CN105490249B CN201610030525.9A CN201610030525A CN105490249B CN 105490249 B CN105490249 B CN 105490249B CN 201610030525 A CN201610030525 A CN 201610030525A CN 105490249 B CN105490249 B CN 105490249B
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- CN
- China
- Prior art keywords
- blocking device
- neutral point
- master controller
- state
- transformer neutral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Abstract
A kind of linked protector and method for transformer neutral point blocking device, including：Bus is accessed, connects N platform blocking devices, N is the positive integer more than or equal to 2；Master controller, for monitoring the status information of each blocking device, when judging that blocking device state is not quite identical according to the status information of each blocking device, send transformer neutral point ground connection corresponding to the blocking device control that instruction triggers have acted；Data switch module, the access bus and master controller are connected, data are can recognize that for the data accessed in bus to be converted into master controller, and the instruction conversion that master controller is assigned is sent to access bus.When some blocking device break down or dead electricity can not act when, can tripping remaining regular event blocking device, all transformers is directly grounded operation, share DC current jointly, to avoid a certain transformer from bearing excessive DC current；And multiple devices share a linked protector, cost is saved.
Description
Technical field
The present invention relates to tranformer protection field, more particularly to a kind of linkage for transformer neutral point blocking device to protect
Protection unit and method.
Background technology
D.C. high voltage transmission (high voltage direct currenttr ansmission, HVDC) system is due to it
The features such as power transmission distance is remote, transmission capacity is big, control is flexible has obtained more and more extensive application, but AC and DC mixed running
Electric network composition cause between AC and DC system influence each other it is also all the more obvious.DC transmission system monopole ground connection or bipolar
During off-center operation, DC current will inject the earth by earthing pole, and DC current is grounded by transformer neutral point in ground
AC system is invaded, AC system is had an impact, it is exactly to cause transformer DC magnetic bias to show that most notable of which, which influences,.
In order to suppress influence of the direct current transportation to transformer station high-voltage side bus, change has been installed additional in increasing transformer station or power plant at present
Depressor neutral point blocking device, when DC current exceedes limit value, blocking device action, transformer neutral point passes through electric capacity or string
Connecting resistance etc. is grounded, and plays a part of isolated DC electric current.
But many power plant or transformer station there are more neutral grounded transformers, if when DC current increases, exist
The situation that a certain transformer neutral point blocking device failure or equipment dead electricity can not act, now the transformer individually assume responsibility for
All DC currents, shared without other transformers, DC current can exceed that design of transformer limit value, or even cause transformer
Damage.
The content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, there is provided one kind is used for transformer
The linked protector and method of neutral point blocking device.
The technical solution adopted for the present invention to solve the technical problems is：Construction one kind is set for transformer neutral point blocking
Standby linked protector, including：
Bus is accessed, connects N platform blocking devices, the blocking device is used to exceed protection limit value in neutral point direct current
When transformer neutral point corresponding to control ground connection disconnect and the status information of itself is sent to access bus, N by timing
For the positive integer more than or equal to 2；
Master controller, for monitoring the status information of each blocking device, in the status information according to each blocking device
When judging that blocking device state is not quite identical, transformer corresponding to the blocking device control that instruction triggers have acted is sent
Neutral ground；
Data switch module, the access bus and master controller are connected, for the data accessed in bus to be converted to
Master controller can recognize that data, and the instruction conversion that master controller is assigned is sent to access bus.
Of the present invention in the linked protector of transformer neutral point blocking device, the status information bag
The grounding switch state of neutral point direct current and blocking device is included, grounding switch state includes control transformer neutral point and connect
The open mode that the closure state on ground and control transformer neutral point ground connection disconnect；
Transformer neutral point ground connection corresponding to the blocking device control that described transmission instruction triggers have acted includes：It is main
When controller judges that the grounding switch state of each blocking device received in default delay time is not quite identical, check every
Neutral point direct current corresponding to straight equipment：The master control if master controller judges that neutral point direct current is less than protection limit value
The grounding switch that device processed sends the blocking device that instruction triggers have acted enters closure state；If neutral point direct current is big
In equal to protection limit value, then master controller sends the grounding switch of the not operating blocking device of instruction triggers and enters open mode, if
The grounding switch state of each blocking device is not quite identical after default delay time, then master controller sends instruction triggers
The grounding switch of the blocking device acted enters closure state.
Of the present invention in the linked protector of transformer neutral point blocking device, the linkage protection to fill
The alarm module for also including being connected with the master controller is put, the alarm module is used for not quite identical in blocking device state
When under the control of master controller start alarm.
Of the present invention in the linked protector of transformer neutral point blocking device, the linkage protection to fill
Putting also includes the man-machine interactively module that be connected with the master controller, and the man-machine interactively module is for the inquiry of data and right
The remote control of blocking device.
Of the present invention in the linked protector of transformer neutral point blocking device, the linkage protection to fill
The liquid crystal display for also including being connected with the master controller is put, the liquid crystal display is used to receive and show master controller
Data and the information of man-machine interactively module input.
Of the present invention in the linked protector of transformer neutral point blocking device, the access bus is
RS485 buses.
The invention also discloses a kind of linkage guard method for transformer neutral point blocking device, based on described connection
Dynamic protection device realizes that methods described includes：
The status information of itself is sent to access bus by S1, blocking device timing, and master controller passes through data switch
Module real-time reception blocking device is sent to the status information in access bus；
S2, master controller are set by the status information of the access each blocking device of monitoring bus according to each blocking
When standby status information judges that blocking device state is not quite identical, the blocking device control that instruction triggers have acted is sent
Corresponding transformer neutral point ground connection.
Of the present invention in the linkage guard method of transformer neutral point blocking device, the status information bag
Include the grounding switch state of neutral point direct current and blocking device；Grounding switch state includes control transformer neutral point and connect
The open mode that the closure state on ground and control transformer neutral point ground connection disconnect；
The step S2 includes：
S21, master controller judge that the grounding switch state of each blocking device received in default delay time is endless
Enter step S22 when complete consistent；
Neutral point direct current corresponding to S22, master controller verification blocking device, is protected if neutral point direct current is less than
Shield limit value then performs step S23 and terminated, and performs step S24 if neutral point direct current is more than or equal to protection limit value and ties
Beam；
The grounding switch that S23, master controller send the blocking device that instruction triggers have acted enters closure state；
The grounding switch that S24, master controller send the not operating blocking device of instruction triggers enters open mode, if pre-
If the grounding switch state of each blocking device is not quite identical after delay time, then master controller has sent instruction triggers
The grounding switch of the blocking device of action enters closure state.
Of the present invention in the linkage guard method of transformer neutral point blocking device, in the step S2,
When blocking device state is not quite identical, master controller also controls alarm module to start alarm.
Of the present invention in the linkage guard method of transformer neutral point blocking device, methods described also to be wrapped
Include：Data query is carried out by the man-machine interactively module and remote control is performed to blocking device.
Implement the linked protector and method for transformer neutral point blocking device of the present invention, have with following
Beneficial effect：The present invention realizes linkage and protection to more blocking devices by accessing bus and master controller, once find every
When directly equipment state is not quite identical, transformer neutral point corresponding to the blocking device control that transmission instruction triggers have acted connects
Ground, therefore when some blocking device breaks down or dead electricity can not act, remaining blocking being operating normally can be set with tripping
It is standby, all transformers is directly grounded operation, share DC current jointly, with avoid a certain transformer bear it is excessive in
Property point DC current；And more units share a linked protector, save equipment cost；Further, master controller
The DC current state of each transformer is monitored in real time, and combination liquid crystal display, man-machine interactively module can be realized remotely
Control function.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the structural representation of the linked protector for transformer neutral point blocking device of the present invention；
Fig. 2 is the flow chart of the linked protector for transformer neutral point blocking device of the present invention.
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now compares accompanying drawing and describe in detail
The embodiment of the present invention.
It is the structural representation of the linked protector for transformer neutral point blocking device of the present invention with reference to figure 1；
The linked protector of the present invention, including：Access bus, data switch module, master controller, it is preferred that also wrap
Include alarm module, man-machine interactively module, liquid crystal display.Wherein：
Bus is accessed, connects N platform blocking devices, the blocking device is used to exceed protection limit value in neutral point direct current
When transformer neutral point corresponding to control ground connection disconnect and the status information of itself is sent to access bus, N by timing
For the positive integer more than or equal to 2；
Wherein, status information includes：The grounding switch state of neutral point direct current and blocking device, grounding switch shape
The open mode that state includes the closure state of control transformer neutral point ground connection and control transformer neutral point ground connection disconnects.
Preferably, bus of the RS485 buses as data transfer can be used, it is each to realize that the linked protector receives
The status data and linked protector that blocking device uploads assign action command to each blocking device.RS485 agreements can
The point-to-point information transfer of multiple equipment is realized in a manner of by bus, an Address Recognition, saves the use of data wire
Quantity and laying difficulty.
Data switch module, the access bus and master controller are connected, for the data accessed in bus to be converted to
Master controller can recognize that data, and the instruction conversion that master controller is assigned is sent to access bus.It is total according to RS485
Line, then data switch module supporting RS485 transmission/reception module can be selected.
Master controller, for monitoring the status information of each blocking device, in the status information according to each blocking device
When judging that blocking device state is not quite identical, transformer corresponding to the blocking device control that instruction triggers have acted is sent
Neutral ground.
Master controller is the control unit of whole device, can be by common industrial computer and to be equipped with special program soft
Part realizes function.Can also be by PLC, by being programmed PLC to realize function.
The present invention realizes linkage and protection to N platform blocking devices by accessing bus and master controller, once find every
When directly equipment state is not quite identical, transformer neutral point corresponding to the blocking device control that transmission instruction triggers have acted connects
Ground, therefore when some blocking device breaks down or dead electricity can not act, remaining blocking being operating normally can be set with tripping
It is standby, all transformers is directly grounded operation, share DC current jointly, with avoid a certain transformer bear it is excessive in
Property point DC current；And more units share a linked protector, save equipment cost.
Specifically, master controller judges the grounding switch state of each blocking device received in default delay time not
When completely the same, you can judge that blocking device state is not quite identical, it is then neutral corresponding to master controller verification blocking device
Point DC current：If master controller judges that neutral point direct current is less than protection limit value, the blocking for representing to have acted is set
Standby to malfunction, then the grounding switch for the blocking device that master controller transmission instruction triggers have acted enters closure state,
So that transformer neutral point is grounded；If neutral point direct current is more than or equal to protection limit value, not operating blocking device is represented
There is refused action, then the grounding switch of the not operating blocking device of master controller transmission instruction triggers enters open mode, so that
The ground connection of transformer neutral point is disconnected, and centering point is protected, if each blocking device connects after default delay time
Ground disconnecting link state is not quite identical, then it represents that still has the grounding switch state of part blocking device not according to master controller
Instruction action, then master controller send the grounding switch of blocking device that instruction triggers have acted and enter closure state, with guarantor
All transformer neutral point ground connection is demonstrate,proved, and then shares the influence of neutral point direct current jointly.
Wherein, default delay time, which allows for data and sends to receive, can have certain delay.Such as it will can preset
Delay time is set to 5s, but is not limited, and can specifically be set according to actual conditions.
Alarm module, it is connected with the master controller, the alarm module is used for not quite identical in blocking device state
When under the control of master controller start alarm.Such as warning lamp and buzzer warning, when master controller judges that blocking device goes out
Sound and light alarm is sent when existing failure or power down, reminds in operation or patrol officer's system and failure be present.
Man-machine interactively module, it is connected with the master controller, such as keyboard, mouse, the man-machine interactively module are used to count
According to inquiry and the remote control to blocking device.
Liquid crystal display, it is connected with the master controller, the liquid crystal display is used to receive and show master controller
Data and the information of man-machine interactively module input.
Master controller monitors the DC current state of each transformer in real time, and combines liquid crystal display, man-machine interactively mould
Block can realize remote control function, such as：During to meet special requirement such as debugging, hotline maintenance, the device can be by certain
Blocking device forces, in a certain state, such as in transformer power transmission, blocking device to be forced, in grounding switch closing position, to avoid
Current imbalance causes transformer to trip during power transmission, stable after power transmission to cancel forced signal again.
With reference to figure 2, accordingly, the invention also discloses a kind of linkage protection side for transformer neutral point blocking device
Method, realize, methods described includes based on described linked protector：
The status information of itself is sent to access bus by S1, blocking device timing, and master controller passes through data switch
Module real-time reception blocking device is sent to the status information in access bus；
S2, master controller are set by the status information of the access each blocking device of monitoring bus according to each blocking
When standby status information judges that blocking device state is not quite identical, the blocking device control that instruction triggers have acted is sent
Corresponding transformer neutral point ground connection.
Wherein, the status information includes the grounding switch state of neutral point direct current and blocking device；Earthing
The open mode that lock state includes the closure state of control transformer neutral point ground connection and control transformer neutral point ground connection disconnects；
Preferably, in the step S2, when blocking device state is not quite identical, master controller also controls alarm module
Start alarm.
The step S2 includes：
S21, master controller judge that the grounding switch state of each blocking device received in default delay time is endless
Enter step S22 when complete consistent；
Neutral point direct current corresponding to S22, master controller verification blocking device, is protected if neutral point direct current is less than
Shield limit value then performs step S23 and terminated, and performs step S24 if neutral point direct current is more than or equal to protection limit value and ties
Beam；
The grounding switch that S23, master controller send the blocking device that instruction triggers have acted enters closure state；
The grounding switch that S24, master controller send the not operating blocking device of instruction triggers enters open mode, if pre-
If the grounding switch state of each blocking device is not quite identical after delay time, then master controller has sent instruction triggers
The grounding switch of the blocking device of action enters closure state.
Methods described also includes：Data query is carried out by the man-machine interactively module and blocking device performed long-range
Control.
The operation principle of the present invention is discussed in detail with specific example below：
So that N is equal to 4 as an example, every transformer is each equipped with a blocking device, and each blocking device is total by RS485
Status information is uploaded on linked protector by line.If blocking device acts, its corresponding grounding switch state is to beat
Open state, if blocking device is not operating, its corresponding grounding switch state is closure state.
If master controller is open mode sometime monitoring the grounding switch state of certain blocking device, prolong
When 5s default delay time after, the grounding switch state for determining whether blocking device is closure state, if there remains 2
Grounding switch state be closure state, then may determine that each blocking device state is not quite identical, have 2 actions, 2 are not
Action.But now and it is uncertain be malfunctioning for 2 actions, or 2 not operating appearance refused actions.Then connect down
Carry out the current value that master controller checks neutral point direct current, the judgement of fault type is carried out according to neutral point direct current.
If current value is less than the protection limit value of blocking device, judge that the blocking device of 2 actions substantially belongs to mistake
Action, master controller send instruction to 2 blocking devices, and the grounding switch for triggering the blocking device acted enters closed form
State, and the information alarmed by alarm module and malfunctioned by liquid crystal display display blocking device；
If current value is more than the protection limit value of blocking device, judge that refused action occur in 2 not operating blocking devices,
Linked protector sends instruction to 2 not operating blocking devices, triggers its grounding switch and enters open mode, and passes through report
Alert module alarm and the information that blocking device refused action is shown by liquid crystal display；If after 5s default delay time,
Still there is 1 blocking device not operating, i.e., the grounding switch state for still having blocking device to upload is closure state, then to other
3 blocking devices of regular event send instructions, and trigger its grounding switch and enter closure state, make all transformer neutral points direct
Ground connection, shared DC current.
In summary, the linked protector and method for transformer neutral point blocking device of the present invention is implemented,
Have the advantages that：The present invention realizes linkage and protection to N platform blocking devices by accessing bus and master controller,
When finding that blocking device state is not quite identical, transformation corresponding to the blocking device control that instruction triggers have acted is sent
Device neutral ground, therefore when some blocking device breaks down or dead electricity can not act, remaining can normally be moved with tripping
The blocking device of work, all transformers is directly grounded operation, share DC current jointly, to avoid a certain transformer from holding
By excessive neutral point direct current；And more units share a linked protector, save equipment cost；Further
, master controller monitors the DC current state of each transformer in real time, and combination liquid crystal display, man-machine interactively module can
To realize remote control function.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (9)
- A kind of 1. linked protector for transformer neutral point blocking device, it is characterised in that including：Bus is accessed, connects N platform blocking devices, the blocking device is used to exceed protection limit value time control in neutral point direct current The ground connection of transformer neutral point corresponding to system disconnects and the status information of itself is sent to the access bus, N by timing For the positive integer more than or equal to 2；Master controller, for monitoring the status information of each blocking device, judge according to the status information of each blocking device Go out blocking device state it is not quite identical when, it is neutral to send transformer corresponding to the blocking device control that instruction triggers have acted Point ground connection；Data switch module, the access bus and the master controller are connected, for the data in the access bus to be turned It is changed to the master controller and can recognize that data, and the instruction conversion that the master controller is assigned is sent to the access always Line；Wherein, the status information includes the grounding switch state of neutral point direct current and blocking device, the earthing The open mode that lock state includes the closure state of control transformer neutral point ground connection and control transformer neutral point ground connection disconnects；Transformer neutral point ground connection corresponding to the blocking device control that described transmission instruction triggers have acted includes：The master When controller judges that the grounding switch state of each blocking device received in default delay time is not quite identical, check every Neutral point direct current corresponding to straight equipment：If the master controller judges that the neutral point direct current is less than protection and limited Then master controller sends the grounding switch of blocking device that instruction triggers have acted and enters closure state value；If the neutrality Point DC current is more than or equal to protection limit value, and then master controller sends the grounding switch of the not operating blocking device of instruction triggers and entered Enter open mode, if the grounding switch state of each blocking device is not quite identical after default delay time, the master The grounding switch that controller sends the blocking device that instruction triggers have acted enters closure state.
- 2. the linked protector according to claim 1 for transformer neutral point blocking device, it is characterised in that institute The alarm module that linked protector also includes being connected with the master controller is stated, the alarm module is used in blocking device shape Start alarm when state is not quite identical under the control of the master controller.
- 3. the linked protector according to claim 1 for transformer neutral point blocking device, it is characterised in that institute The man-machine interactively module that linked protector also includes being connected with the master controller is stated, the man-machine interactively module is used for data Inquiry and the remote control to blocking device.
- 4. the linked protector according to claim 3 for transformer neutral point blocking device, it is characterised in that institute The liquid crystal display that linked protector also includes being connected with the master controller is stated, the liquid crystal display is used to receive and show Show the data of the master controller and the information of man-machine interactively module input.
- 5. the linked protector according to claim 1 for transformer neutral point blocking device, it is characterised in that institute It is RS485 buses to state access bus.
- 6. a kind of linkage guard method for transformer neutral point blocking device, it is characterised in that based on described in claim 1 Linked protector realize that methods described includes：The status information of itself is sent to access bus by S1, blocking device timing, and master controller passes through data switch module Real-time reception blocking device is sent to the status information in access bus；S2, master controller are by the status information for accessing each blocking device of monitoring bus, according to each blocking device When status information judges that blocking device state is not quite identical, it is corresponding to send the blocking device control that instruction triggers have acted Transformer neutral point ground connection；Wherein, the status information includes the grounding switch state of neutral point direct current and blocking device；The earthing The open mode that lock state includes the closure state of control transformer neutral point ground connection and control transformer neutral point ground connection disconnects；The step S2 includes：S21, the master controller judge that the grounding switch state of each blocking device received in default delay time is endless Enter step S22 when complete consistent；Neutral point direct current corresponding to S22, master controller verification blocking device, if the neutral point direct current is small Step S23 is then performed in protection limit value and is terminated, and step is performed if the neutral point direct current is more than or equal to protection limit value Rapid S24 simultaneously terminates；The grounding switch that S23, the master controller send the blocking device that instruction triggers have acted enters closure state；The grounding switch that S24, the master controller send the not operating blocking device of instruction triggers enters open mode, if pre- If the grounding switch state of each blocking device is not quite identical after delay time, then the master controller sends instruction triggers The grounding switch of the blocking device acted enters closure state.
- 7. the linkage guard method according to claim 6 for transformer neutral point blocking device, it is characterised in that institute State in step S2, when blocking device state is not quite identical, the master controller also controls alarm module to start alarm.
- 8. the linkage guard method according to claim 6 for transformer neutral point blocking device, it is characterised in that institute Stating method also includes：Data query is carried out by man-machine interactively module and remote control is performed to blocking device.
- 9. the linkage guard method according to claim 8 for transformer neutral point blocking device, it is characterised in that institute Stating method also includes：Liquid crystal display receives and shown the letter that the data of the master controller and the man-machine interactively module input Breath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610030525.9A CN105490249B (en) | 2016-01-18 | 2016-01-18 | Linked protector and method for transformer neutral point blocking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610030525.9A CN105490249B (en) | 2016-01-18 | 2016-01-18 | Linked protector and method for transformer neutral point blocking device |
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| Publication Number | Publication Date |
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| CN105490249A CN105490249A (en) | 2016-04-13 |
| CN105490249B true CN105490249B (en) | 2018-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022170282A1 (en) * | 2021-02-08 | 2022-08-11 | Techhold, Llc | Control system for transformer protection system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994552B (en) * | 2019-12-05 | 2021-07-27 | 华中科技大学 | Autonomous switching method of neutral point ground current suppression device of transformer |
| CN112653183B (en) * | 2020-12-07 | 2023-07-28 | 苏州热工研究院有限公司 | Centralized switching control system and method for multiple transformer blocking devices of power plant or power grid |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10018372C2 (en) * | 2000-04-13 | 2003-12-04 | Siemens Ag | Circuit arrangement for inrush current limitation for a power supply |
| CN104465050A (en) * | 2014-11-19 | 2015-03-25 | 广州高澜节能技术股份有限公司 | Grounding system for transformer neutral point capacitance type direct current blocking device |
| CN204809845U (en) * | 2015-07-17 | 2015-11-25 | 东北电力大学 | A electric capacity separates straightens device for transformer neutral point |
| CN205283097U (en) * | 2016-01-18 | 2016-06-01 | 阳江核电有限公司 | A linkage protection device that is used for transformer neutral point to separate straight equipment |
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2016
- 2016-01-18 CN CN201610030525.9A patent/CN105490249B/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022170282A1 (en) * | 2021-02-08 | 2022-08-11 | Techhold, Llc | Control system for transformer protection system |
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