CN110523028A - The oil draining nitrogen filling device remote control apparatus and control method of oil-immersed transformer - Google Patents
The oil draining nitrogen filling device remote control apparatus and control method of oil-immersed transformer Download PDFInfo
- Publication number
- CN110523028A CN110523028A CN201910905300.7A CN201910905300A CN110523028A CN 110523028 A CN110523028 A CN 110523028A CN 201910905300 A CN201910905300 A CN 201910905300A CN 110523028 A CN110523028 A CN 110523028A
- Authority
- CN
- China
- Prior art keywords
- nitrogen filling
- oil draining
- oil
- filling device
- draining nitrogen
- 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.)
- Granted
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 182
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 31
- 238000010792 warming Methods 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 238000004880 explosion Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
Landscapes
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Housings And Mounting Of Transformers (AREA)
- Transformer Cooling (AREA)
Abstract
The invention discloses the oil draining nitrogen filling device remote control apparatuses and control method of a kind of oil-immersed transformer, it includes: oil draining nitrogen filling starting control terminal, and oil draining nitrogen filling starting control terminal is connect with the output end of oil draining nitrogen filling device driving circuit；First to the 6th input terminal of oil draining nitrogen filling device driving circuit is connect with hand auto-switching push button output end, the output end of warming fire detector, the grave gas signal output end of gas relay, the circuit breaker trip signal end of three side of transformer switch, long-range monitoring computer control output end and long-range start button output end respectively；The oil draining nitrogen filling system for solving the oil-immersed type transformer of the prior art is generally equipped with manual actuation of button in Substation control room, when oil draining nitrogen filling device tripping, if undiscovered in unattended station warming fire detector or gas relay failure, it, also can not the quick manual starting technical problems such as oil draining nitrogen filling device when fire for transformer.
Description
Technical field
The invention belongs to oil-immersed transformer fire-fighting technique more particularly to a kind of oil draining nitrogen filling devices of oil-immersed transformer
Remote control apparatus and control method.
Background technique
Oil-immersed type transformer is one of the main equipment in substation and power plant.Have inside oil-immersed transformer a large amount of flammable
Transformer oil, when the following occurs, easily cause transformer fire accident: Inside coil insulation damages, coil is because of short circuit
Burn；Inner conductive junction loosens or disconnects, and generation electric arc causes on fire from explosion；Bushing damage, aging or sudden strain of a muscle
Network sets off an explosion on fire；Transformer oil ageing is rotten to cause interior network to puncture and cause exploding and firing accident.Because these situations can not
It thoroughly avoids, oil-immersed transformer accident of unexpected explosion on fire during production run happens occasionally.
Oil-drainage nitrogen-filling fire-extinguishing is that the nineties are introduced by foreign countries and digest a kind of special needle developed at home
To the extinguishing device of oil-immersed type transformer and other oil-filled electric equipments；When inside transformer breaks down, fuel tank internal generates big
Fuel gas is measured, gas relay is caused to act, issues grave gas signal, circuit breaker trip；Power transformer interior fault is led simultaneously
It causes oil temperature to increase, arranges warming fire detector movement on the transformer, issue fire alarm to Fire Control Cabinet.Fire-fighting control
After cabinet processed is connected to fire alarm, grave gas signal, circuit breaker trip signal, control system starts the electromagnet of weight, weight band
Dynamic draining valve is opened, and oil extraction is started.The cut-off valve being mounted below conservator simultaneously is automatically closed, and cuts off conservator to transformer body
Fuel feeding, transformer oil fuel level in tank reduce, and oil pressure mitigates, and prevent Explosion of Transformer.By the several seconds delay (generally 3S to 20S),
Control system starts nitrogen relief valve, and the nitrogen in high-pressure nitrogen bottle enters oil tank of transformer bottom by infusing nitrogen pipeline, is filled with
Intrinsic transformer oil, the change of the transformer oil and upper layer higher temperature of bottom lower temperature is sufficiently stirred in transformer body
Depressor oil stirring, so that oil temperature is down to burning point hereinafter, and nitrogen be filled with can air-isolation, avoid fire hazard.
At present in oil draining nitrogen filling system product on the market, fire alarm, grave gas signal and circuit breaker trip signal are
Start the necessary condition of oil draining nitrogen filling program.In three necessary conditions, temperature of the fire alarm from arrangement on the transformer
Feel fire detector, grave gas signal derives from gas relay, and warming fire detector and gas relay are failure rates
Higher equipment.If warming fire detector or gas relay failure will lead to oil draining nitrogen filling device when fire for transformer
Tripping can not put out a fire.
Although oil draining nitrogen filling system is generally equipped with manual actuation of button in Substation control room, when oil draining nitrogen filling device tripping
When, operator on duty can be in oil draining nitrogen filling control cabinet manual start device.But current substation gradually develops to unattended station,
More and more substations central station of floating dock no longer sets operator on duty.If warming fire detector or gas relay failure and do not sent out
It is existing, it, also can not quick manual starting oil draining nitrogen filling device when fire for transformer.
Summary of the invention
The technical problem to be solved by the present invention is the oil draining nitrogen filling device for providing a kind of oil-immersed transformer remotely controls dress
It sets and control method, is generally equipped with hand in Substation control room to solve the oil draining nitrogen filling system of oil-immersed type transformer of the prior art
Dynamic start button, when oil draining nitrogen filling device tripping, operator on duty can be in oil draining nitrogen filling control cabinet manual start device.But mesh
Preceding substation gradually develops to unattended station, and more and more substation's central station of floating docks no longer set operator on duty.If warming fire
Detector or gas relay failure and it is undiscovered, when fire for transformer, also can not quick manual starting oil draining nitrogen filling dress
The technical problems such as set.
The technical scheme is that
A kind of oil draining nitrogen filling device remote control apparatus of oil-immersed transformer, it includes: oil draining nitrogen filling starting control terminal, oil extraction
Note nitrogen starting control terminal is connect with the output end of oil draining nitrogen filling device driving circuit；The first of oil draining nitrogen filling device driving circuit to
6th input terminal respectively with hand auto-switching push button output end, the output end of warming fire detector, gas relay weight watt
This signal output end, the circuit breaker trip signal end of three side of transformer switch, long-range monitoring computer control output end and long-range
The connection of start button output end.
First to fourth input terminal of the oil draining nitrogen filling device driving circuit respectively with first with door first to fourth input
End connection；The 5th input terminal and the 6th input terminal of oil draining nitrogen filling device driving circuit are connect with the first OR gate input end respectively；
First or the 4th input terminal of gate output terminal and oil draining nitrogen filling device driving circuit connect respectively with second with door input terminal；First
It is connect respectively with the second OR gate input end with gate output terminal and second with gate output terminal；Second or gate output terminal and oil draining nitrogen filling fill
Set the output end connection of driving circuit.
A kind of control method of the oil draining nitrogen filling device remote control apparatus of oil-immersed transformer, it includes:
Step 1, when the oil-immersed transformer of substation is on fire, trigger warming fire detector and gas relay under normal circumstances
Device movement, if three sides switch has tripped, oil draining nitrogen filling device starts automatically, if three sides switch does not trip, operations staff is received
After fire alarm, three side switch trips are operated, it is automatic to start oil draining nitrogen filling device；
Step 2, when the oil-immersed transformer of substation is on fire, the warming fire detector or gas relay failure the case where
Under, the operator on duty at substation's novel maintenance center is viewed situation on fire, is led to immediately by the video monitoring system of substation
Range monitoring computer checks oil draining nitrogen filling unit state too far, if quick drain valve and nitrogen opening valve are not opened, confirms temperature
Three side switch states are checked in sense fire detector or gas relay failure, oil draining nitrogen filling device tripping at this time, if three sides switch
It has been tripped that, then oil draining nitrogen filling device is directly initiated by remotely monitoring computer and long-range start button immediately, if three sides switch
It does not trip, then contacts operations staff and operate three side switch trips, then opened by remotely monitoring computer and long-range start button
Dynamic oil draining nitrogen filling device.
The invention has the advantages that:
The present invention monitors computer and soft or hard two-way enabling signal in substation's novel maintenance center arrangement oil draining nitrogen filling device, when
Fire for transformer, and when warming fire detector or gas relay failure, operation maintenance personnel can remotely start oil draining nitrogen filling dress
It sets, puts out a fire in time, avoid bigger loss, while using circuit breaker trip signal as the necessary condition remotely started, keeping away
Exempt from oil draining nitrogen filling error action of device and cause transformer damage, the oil draining nitrogen filling system for solving the oil-immersed type transformer of the prior art is general
It is equipped with manual actuation of button in Substation control room, when oil draining nitrogen filling device tripping, operator on duty can be in oil draining nitrogen filling control
Cabinet manual start device processed.But current substation gradually develops to unattended station, and more and more substation's central station of floating docks are no longer
If operator on duty.If warming fire detector or gas relay failure and it is undiscovered, also can not be fast when fire for transformer
Speed manually boots the technical problems such as oil draining nitrogen filling device.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is general frame schematic diagram of the present invention；
Fig. 3 is prior art control schematic diagram of the present invention.
Specific embodiment
The present invention includes long-range monitoring computer 8, long-range start button 9 and oil draining nitrogen filling device driving circuit 11；It is described
Long-range monitoring computer is arranged in the novel maintenance center outside substation, is connect, is arranged with oil draining nitrogen filling control cabinet by Ethernet
Oil infuses nitrogen control cabinet for the warming fire detector of oil draining nitrogen filling device, gas relay, quick drain valve, closing valve, nitrogen
Opening valve and circuit breaker trip signal condition are sent to long-range monitoring computer；The long-range start button is arranged in outside substation
Novel maintenance center is connect by hardwire with oil draining nitrogen filling control cabinet, by remotely monitoring computer remote control instruction 5 or passing through
It is closed long-range start button 9 and sends enabled instruction to oil draining nitrogen filling control cabinet, enabled instruction is through oil draining nitrogen filling device driving circuit
11 logic circuit, in the case where meeting entry condition, driving oil draining nitrogen filling control cabinet starts oil draining nitrogen filling device.
The oil draining nitrogen filling device driving circuit 11 includes input, output end and logical operation circuit；The input terminal
Believe including the auto state signal 1 from oil draining nitrogen filling device hand auto-switching push button, the fire alarm from warming fire detector
Numbers 2, the grave gas signal 3 from gas relay, the circuit breaker trip signal 4 from three side of transformer switch, from long-range
Monitor computer remote control instruction 5 and the enabling signal 6 from long-range start button；The output end 7 accesses quick drain valve
With the relay driving circuit of nitrogen opening valve；The logical operation circuit includes that oil draining nitrogen filling device starts logic and remote automatically
Cheng Qidong logic, the automatic logic that starts is auto state signal 1, fire alarm 2, grave gas signal 3, circuit breaker trip signal 4
When being simultaneously " 1 ", driving circuit exports " 1 ", and long-range starting logic is telecommand 5 or enabling signal 6 is " 1 " and breaker is jumped
When lock signal 4 is " 1 ", driving circuit exports " 1 ".
Control method are as follows:
One) when the oil-immersed transformer of substation is on fire, under normal circumstances, warming fire detector and gas relay are triggered
Movement, if three sides switch has tripped, oil draining nitrogen filling device starts automatically, if three sides switch does not trip, operations staff receives fire
After alert signal, three side switch trips are operated, it is automatic to start oil draining nitrogen filling device；
Two) when the oil-immersed transformer of substation is on fire, in the case where warming fire detector or gas relay failure,
The operator on duty at substation's novel maintenance center can be viewed situation on fire, then be stood by the video monitoring system of substation
Oil draining nitrogen filling unit state is checked by remotely monitoring computer, if quick drain valve and nitrogen opening valve are not opened, really
Recognize warming fire detector or gas relay failure, three side switch states are checked in oil draining nitrogen filling device tripping at this time, if three sides
Switch has tripped, then oil draining nitrogen filling device is directly initiated by remotely monitoring computer and long-range start button immediately, if three sides
Switch does not trip, then connection operations staff operates three side switch trips immediately, then by remotely monitoring computer and remotely opening
It is dynamic to press starting oil draining nitrogen filling device.
Claims (3)
1. a kind of oil draining nitrogen filling device remote control apparatus of oil-immersed transformer, it includes: oil draining nitrogen filling starting control terminal,
Be characterized in that: oil draining nitrogen filling starting control terminal is connect with the output end of oil draining nitrogen filling device driving circuit；Oil draining nitrogen filling device drives
First to the 6th input terminal in dynamic circuit respectively with hand auto-switching push button output end, the output end of warming fire detector, gas
The grave gas signal output end of body relay, the circuit breaker trip signal end of three side of transformer switch, long-range monitoring computer control
Output end processed is connected with long-range start button output end.
2. a kind of oil draining nitrogen filling device remote control apparatus of oil-immersed transformer according to claim 1, feature exist
In: first to fourth input terminal of first to fourth input terminal of the oil draining nitrogen filling device driving circuit respectively with first and door connects
It connects；The 5th input terminal and the 6th input terminal of oil draining nitrogen filling device driving circuit are connect with the first OR gate input end respectively；First
Or the 4th input terminal of gate output terminal and oil draining nitrogen filling device driving circuit is connect with second with door input terminal respectively；First and door
Output end and second is connect with the second OR gate input end respectively with gate output terminal；Second or gate output terminal and oil draining nitrogen filling device drive
The output end connection in dynamic circuit.
3. a kind of control method of the oil draining nitrogen filling device remote control apparatus of oil-immersed transformer as described in claim 1,
It includes:
Step 1, when the oil-immersed transformer of substation is on fire, trigger warming fire detector and gas relay under normal circumstances
Device movement, if three sides switch has tripped, oil draining nitrogen filling device starts automatically, if three sides switch does not trip, operations staff is received
After fire alarm, three side switch trips are operated, it is automatic to start oil draining nitrogen filling device；
Step 2, when the oil-immersed transformer of substation is on fire, the warming fire detector or gas relay failure the case where
Under, the operator on duty at substation's novel maintenance center is viewed situation on fire, is led to immediately by the video monitoring system of substation
Range monitoring computer checks oil draining nitrogen filling unit state too far, if quick drain valve and nitrogen opening valve are not opened, confirms temperature
Three side switch states are checked in sense fire detector or gas relay failure, oil draining nitrogen filling device tripping at this time, if three sides switch
It has been tripped that, then oil draining nitrogen filling device is directly initiated by remotely monitoring computer and long-range start button immediately, if three sides switch
It does not trip, then contacts operations staff and operate three side switch trips, then opened by remotely monitoring computer and long-range start button
Dynamic oil draining nitrogen filling device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910905300.7A CN110523028B (en) | 2019-09-24 | 2019-09-24 | Remote control device and control method for oil-discharging and nitrogen-injecting device of oil-immersed transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910905300.7A CN110523028B (en) | 2019-09-24 | 2019-09-24 | Remote control device and control method for oil-discharging and nitrogen-injecting device of oil-immersed transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110523028A true CN110523028A (en) | 2019-12-03 |
| CN110523028B CN110523028B (en) | 2023-11-10 |
Family
ID=68669913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910905300.7A Active CN110523028B (en) | 2019-09-24 | 2019-09-24 | Remote control device and control method for oil-discharging and nitrogen-injecting device of oil-immersed transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110523028B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110917528A (en) * | 2019-12-09 | 2020-03-27 | 国网宁夏电力有限公司 | Cable fire protection judgment method and system for fire protection linkage |
| CN111001115A (en) * | 2019-12-09 | 2020-04-14 | 国网宁夏电力有限公司 | Fire protection judgment method and system for fire-fighting linkage transformer |
| CN111013051A (en) * | 2019-12-07 | 2020-04-17 | 国网辽宁省电力有限公司电力科学研究院 | Oil-immersed transformer oil-discharging nitrogen-injecting fire extinguishing device calibration system and method |
| CN111403154A (en) * | 2020-03-17 | 2020-07-10 | 山东电力设备有限公司 | Quick oil discharge device, control system and control method for transformer body |
| CN113110184A (en) * | 2021-04-19 | 2021-07-13 | 江西清华泰豪三波电机有限公司 | Equipment control device and system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201337778Y (en) * | 2009-02-12 | 2009-11-04 | 保定天威集团有限公司 | Control circuit for transformer fire extinguisher with maloperation prevention |
| CN201783112U (en) * | 2010-08-06 | 2011-04-06 | 陕西德凯电力机械有限公司 | Oil-immersed transformer pressure-protection nitrogen-charging fire-extinguishing device |
| CN102728016A (en) * | 2011-03-31 | 2012-10-17 | 施杰 | Oil-discharge nitrogen-injection fire extinguishing system |
| CN203935543U (en) * | 2014-05-29 | 2014-11-12 | 浙江日新电气有限公司 | Oil-drainage nitrogen-filling fire-extinguishing |
| CN104436477A (en) * | 2014-12-01 | 2015-03-25 | 国家电网公司 | Comprehensive fire fighting system and comprehensive fire fighting method of large-size oil-containing equipment of transformer substation |
| CN207024428U (en) * | 2017-06-14 | 2018-02-23 | 姚永建 | Ore heat furnace transformer unattended surveillance carries fire-extinguishing function concurrently and automatically protects system |
| CN210644903U (en) * | 2019-09-24 | 2020-06-02 | 贵州电网有限责任公司 | Remote control device for oil discharging and nitrogen injecting device of oil-immersed transformer |
-
2019
- 2019-09-24 CN CN201910905300.7A patent/CN110523028B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201337778Y (en) * | 2009-02-12 | 2009-11-04 | 保定天威集团有限公司 | Control circuit for transformer fire extinguisher with maloperation prevention |
| CN201783112U (en) * | 2010-08-06 | 2011-04-06 | 陕西德凯电力机械有限公司 | Oil-immersed transformer pressure-protection nitrogen-charging fire-extinguishing device |
| CN102728016A (en) * | 2011-03-31 | 2012-10-17 | 施杰 | Oil-discharge nitrogen-injection fire extinguishing system |
| CN203935543U (en) * | 2014-05-29 | 2014-11-12 | 浙江日新电气有限公司 | Oil-drainage nitrogen-filling fire-extinguishing |
| CN104436477A (en) * | 2014-12-01 | 2015-03-25 | 国家电网公司 | Comprehensive fire fighting system and comprehensive fire fighting method of large-size oil-containing equipment of transformer substation |
| CN207024428U (en) * | 2017-06-14 | 2018-02-23 | 姚永建 | Ore heat furnace transformer unattended surveillance carries fire-extinguishing function concurrently and automatically protects system |
| CN210644903U (en) * | 2019-09-24 | 2020-06-02 | 贵州电网有限责任公司 | Remote control device for oil discharging and nitrogen injecting device of oil-immersed transformer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111013051A (en) * | 2019-12-07 | 2020-04-17 | 国网辽宁省电力有限公司电力科学研究院 | Oil-immersed transformer oil-discharging nitrogen-injecting fire extinguishing device calibration system and method |
| CN111013051B (en) * | 2019-12-07 | 2023-06-16 | 国网辽宁省电力有限公司电力科学研究院 | Verification system and method for oil-discharging and nitrogen-injecting fire extinguishing device of oil-immersed transformer |
| CN110917528A (en) * | 2019-12-09 | 2020-03-27 | 国网宁夏电力有限公司 | Cable fire protection judgment method and system for fire protection linkage |
| CN111001115A (en) * | 2019-12-09 | 2020-04-14 | 国网宁夏电力有限公司 | Fire protection judgment method and system for fire-fighting linkage transformer |
| CN111403154A (en) * | 2020-03-17 | 2020-07-10 | 山东电力设备有限公司 | Quick oil discharge device, control system and control method for transformer body |
| CN113110184A (en) * | 2021-04-19 | 2021-07-13 | 江西清华泰豪三波电机有限公司 | Equipment control device and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110523028B (en) | 2023-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110523028A (en) | The oil draining nitrogen filling device remote control apparatus and control method of oil-immersed transformer | |
| CN201783112U (en) | Oil-immersed transformer pressure-protection nitrogen-charging fire-extinguishing device | |
| EP1949392B1 (en) | Method and device for prevention and protection of electrical transformer against explosion and fire | |
| EP2232510B1 (en) | A system and method for preventing, protecting oltc from fire and/or transformer from explosion | |
| CN104436477B (en) | The large-scale oily plant of transformer station integrates fire-fighting system and method | |
| CN203935543U (en) | Oil-drainage nitrogen-filling fire-extinguishing | |
| CN210644903U (en) | Remote control device for oil discharging and nitrogen injecting device of oil-immersed transformer | |
| CN111013051B (en) | Verification system and method for oil-discharging and nitrogen-injecting fire extinguishing device of oil-immersed transformer | |
| CN107327394A (en) | A kind of mechanical starter by force for Firefighting Pump Control cabinet | |
| CN202721378U (en) | Fire-proof and explosion-proof monitoring system | |
| CN212593609U (en) | Explosion-proof oil-discharging nitrogen-injecting fire extinguishing device for oil-immersed transformer | |
| WO2020008471A1 (en) | Nifps system for transformer protection | |
| CN105097190A (en) | Charged full-automatic flame failure protection device and protection method for oil immersed transformer | |
| WO2020215527A1 (en) | Double-ground safety system capable of improving reliability | |
| CN103647306A (en) | Automatic quasi-synchronization closing loop for preventing generator nonsynchronous closing | |
| CN207283151U (en) | A kind of cement milling main motor interlocking protective system | |
| CN204706818U (en) | A kind of high-tension switch cabinet switching-off device | |
| CN112337010A (en) | Modularized microcomputer type oil discharge and nitrogen injection control device | |
| CN109167264B (en) | Jump preventing device for circuit breaker in high-voltage switch cabinet | |
| CN210956555U (en) | Novel electric loop thermal relay reset circuit | |
| CN205069271U (en) | Electrified automatic fire extinguishing protection device entirely of oil immersed transformer | |
| CN104269825A (en) | Transformer ultra-high voltage overvoltage insulation disconnecting link rod automatic switching device and control method | |
| CN105529212A (en) | Oil tank pressure relay protection device and protection method for transformer | |
| CN219534404U (en) | High-voltage electrical equipment for preventing jump and locking of vacuum contactor | |
| CN207297307U (en) | A kind of direct current oil pump is met an urgent need device for rapidly starting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |