CN209627052U - A kind of power transformation O&M safety alarm device - Google Patents
A kind of power transformation O&M safety alarm device Download PDFInfo
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- CN209627052U CN209627052U CN201920016960.5U CN201920016960U CN209627052U CN 209627052 U CN209627052 U CN 209627052U CN 201920016960 U CN201920016960 U CN 201920016960U CN 209627052 U CN209627052 U CN 209627052U
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- 230000005611 electricity Effects 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 14
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- 230000002452 interceptive effect Effects 0.000 description 1
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Abstract
This application discloses a kind of power transformation O&M safety alarm devices, comprising: the detection circuit with the circuit switch electrical couplings in electrification interval switches on-off state for detection circuit, generates and sends corresponding intake to MCU；The MCU connecting with detection circuit for judging the circuit state at electrification interval according to the on off operating mode of circuit switch, and generates corresponding circuit state indication signal；The circuit state attention device being connect with MCU, the circuit state indication signal sent for receiving and showing MCU.It can be seen that, the on off operating mode that the application passes through each circuit switch in detection electrification interval, it can determine that out the locating circuit state in electrification interval, and then it is shown using circuit state attention device, it is not only convenient and simple but also reliable and stable, service personnel can be effectively prevent to be strayed into the electrification interval in non-inspecting state, effectively ensured personal safety and equipment safety.
Description
Technical field
This application involves power safety technique field, in particular to a kind of power transformation O&M safety alarm device.
Background technique
In substation, high voltage power distributing cabinet is often divided into multiple and different regions, technical term is known as " electrification interval ", the inside
The devices such as all kinds of high-tension lines and control switch are distributed with.Electrification interval is usually locking, because being strayed into operation
Electric shock accidents can occur for the electrification interval of state, be breakneck for operation maintenance personnel.So operation maintenance personnel is entering electrification
In interval before progress line maintenance, therefore, to assure that the electrification interval of the Awaiting Overhaul powers off and earthing switch blade is grounded, in this field
Electrification interval commonly referred to as at this time is in " inspecting state ".Operation maintenance personnel is strayed between the electrification in other states in order to prevent
Every, in the prior art, service personnel generally by the way of setting maintenance sign board, suspension red cloth curtain will in inspecting state and
The electrification interval of other states distinguishes.But for being distributed for more intensive electrification interval, setting maintenance sign board
Or red cloth curtain is not only more troublesome, and be easy to happen and fall, dislocation situations such as, cause service personnel to be strayed into non-maintenance shape
The electrification interval of state, endangers personal safety and equipment safety.In consideration of it, providing a kind of technology to solve the above problems is this field
It is paid close attention to required for technical staff.
Utility model content
The application's is designed to provide a kind of power transformation O&M safety alarm device, to be safely and reliably spaced to electrification
Operating status warned, to prevent service personnel to be strayed into the electrification interval in non-inspecting state, guarantee personal safety and
Equipment safety.
In order to solve the above technical problems, the application provides a kind of power transformation O&M safety alarm device, comprising:
With electrification interval in circuit switch electrical couplings detection circuit, for detecting the on-off shape of the circuit switch
State generates and sends corresponding intake to MCU；
The MCU being connect with the detection circuit, for judging the band according to the on off operating mode of the circuit switch
The circuit state at electricity interval, and generate corresponding circuit state indication signal；
The circuit state attention device being connect with the MCU, the circuit state sent for receiving and showing the MCU
Indication signal.
Optionally, the detection circuit specifically with the auxiliary contact electrical couplings of the circuit switch.
Optionally, the circuit switch includes breaker, the first first disconnecting link, the second first disconnecting link, second disconnecting link, the third disconnecting link and connects
Ground disconnecting link；The first first disconnecting link is connected between the first bus and the first end of the breaker, and the second first disconnecting link connects
It connecing between the second bus and the first end of the breaker, the second end of the breaker is grounded by the grounding switch,
The second disconnecting link is connected between the second end of the breaker and substation's output line trackside, and third disconnecting link is connected to described
Between the second end and hospital bus bar of breaker；
The MCU is specifically used for: judging whether each circuit switch disconnects；If so, between determining the electrification
Every circuit state be stoppage in transit state；If it is not, then judging whether that the grounding switch is closed and other circuit switches disconnect；If
It is then to determine that the circuit state at the electrification interval is inspecting state；If it is not, then determining that the circuit state at the electrification interval is
Operating status.
Optionally, the cabinet door travel switch electrical couplings of the detection circuit and the electrification interval, it is described for detecting
The on off operating mode of cabinet door travel switch generates and sends corresponding intake to the MCU；
The MCU is also used to: judge whether the cabinet door is opened according to the on off operating mode of the cabinet door travel switch, and
When the circuit state for determining the electrification interval is not inspecting state and cabinet door opening, generates alarm signal and be simultaneously sent to institute
Circuit state attention device is stated to be alerted.
Optionally, the circuit state attention device includes following any one or any combination:
Indicator light, display screen, phonetic alarm.
Optionally, further include for for the detection circuit and the MCU power supply the first power circuit and for for
The second source circuit of the circuit state attention device power supply.
Optionally, the driving circuit of the circuit state attention device is relay drive circuit.
Optionally, the detection circuit is specially light-coupled isolation detection circuit.
It optionally, further include the remote communication circuit being connect with the MCU, the electricity for generating and sending the MCU
Line state information is sent to remote monitoring terminal and is shown.
Optionally, the remote communication circuit is specially RS485 telecommunication circuit.
Power transformation O&M safety alarm device provided herein includes: and charges the circuit switch electrical couplings in being spaced
Detection circuit generate and send corresponding intake to MCU for detecting the on off operating mode of the circuit switch；With it is described
The MCU of detection circuit connection, for judging the circuit shape at the electrification interval according to the on off operating mode of the circuit switch
State, and generate corresponding circuit state indication signal；The circuit state attention device being connect with the MCU, for receiving and showing
The circuit state indication signal that the MCU is sent.As it can be seen that the application passes through each circuit switch in detection electrification interval
On off operating mode be can determine that out the locating circuit state in electrification interval, and then be shown using circuit state attention device, not only square
Just simple and reliable and stable, service personnel can be effectively prevent to be strayed into the electrification interval in non-inspecting state, effectively ensured
Personal safety and equipment safety.
Detailed description of the invention
In order to illustrate more clearly of the technical solution in the prior art and the embodiment of the present application, below will to the prior art and
Attached drawing to be used is needed to make brief introduction in the embodiment of the present application description.Certainly, in relation to the attached drawing of the embodiment of the present application below
A part of the embodiment in only the application of description is not paying creativeness to those skilled in the art
Under the premise of labour, other attached drawings can also be obtained according to the attached drawing of offer, other accompanying drawings obtained also belong to the application
Protection scope.
Fig. 1 is a kind of structural block diagram of specific embodiment in power transformation O&M safety alarm device provided herein；
Fig. 2 is the circuit interconnect pattern at electrification interval provided herein；
Fig. 3 is a kind of circuit structure diagram of light-coupled isolation detection circuit provided herein；
Fig. 4 is the circuit structure diagram of the first power circuit of one kind provided herein；
Fig. 5 is a kind of circuit structure diagram of second source circuit provided herein；
Fig. 6 is a kind of circuit structure diagram of the driving circuit of circuit state attention device 3 provided herein；
Fig. 7 is a kind of wiring diagram of RS485 telecommunication circuit provided herein；
Fig. 8 is the wiring diagram of MCU provided herein a kind of；
Fig. 9 is a kind of wiring diagram of phonetic alarm provided herein.
Specific embodiment
The core of the application is to provide a kind of power transformation O&M safety alarm device, to be safely and reliably spaced to electrification
Operating status warned, to prevent service personnel to be strayed into the electrification interval in non-inspecting state, guarantee personal safety and
Equipment safety.
In order to which technical solutions in the embodiments of the present application is more clearly and completely described, below in conjunction with this Shen
Please attached drawing in embodiment, technical solutions in the embodiments of the present application is introduced.Obviously, described embodiment is only
Some embodiments of the present application, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
In power industry, need to become the interlock circuit of substation, equipment by the daily special messenger on duty in base station
Electric O&M, so as to according to substation to operation and maintenance, grid switching operation, accident treatment, equipment-patrolling and management of carrying out production strictly in line with rules and regulations need
It wants, substation efficiently, reasonably manage.When a power failure occurs, service personnel generally requires to enter electrification in high voltage
Maintenance and maintenance activity are carried out in the related electrification interval of cabinet.
To prevent service personnel to be strayed into the electrification interval in non-inspecting state, this application provides a kind of power transformation O&M peaces
Full warning device, referring to Fig. 1, including:
With electrification interval in circuit switch electrical couplings detection circuit 1, for detecting the on-off of the circuit switch
State generates and sends corresponding intake to MCU2；
The MCU2 being connect with detection circuit, for judging the circuit shape at electrification interval according to the on off operating mode of circuit switch
State, and generate corresponding circuit state indication signal；
The circuit state attention device 3 being connect with MCU2, the circuit state indication signal sent for receiving and showing MCU2.
Specifically, unlike the prior art, power transformation O&M safety alarm device provided herein is specially electronics report
Alarm device.Wherein, detection circuit by with electrification interval in each circuit switch electrical couplings, can detecte each circuit and open
The on off operating mode of pass, and then generate relevant intake and be sent to MCU2.Generally, intake is high level, shows to correspond to
Circuit switch closure, intake is low level, show corresponding circuit switch be disconnect.
MCU2 can judge the circuit operations conditions at the electrification interval according to the on off operating mode of each circuit switch, to mention
Show that service personnel not enter the electrification interval of non-inspecting state.MCU2 specifically can voluntarily be selected properly by those skilled in the art
Device realize, for example, giving the selection of three kinds of MCU2 in table 1.By comparing, it is preferred to use cheap, I/O port quantity
Single-chip microcontroller that is more, being internally integrated serial ports, also, the single-chip microcontroller of specific optional STC15W4K56S4 model.
Table 1
Generally, common important circuit switch include breaker, the first first disconnecting link, the second first disconnecting link, second disconnecting link,
Third disconnecting link and grounding switch, it is specific referring to FIG. 2, Fig. 2 is the circuit interconnect pattern at electrification interval provided herein.Such as Fig. 2
Shown, the first first disconnecting link is connected between the first bus and the first end of breaker, the second first disconnecting link be connected to the second bus and
Between the first end of breaker, the second end of breaker is grounded by grounding switch, and second disconnecting link is connected to the second end of breaker
Between substation's output line trackside, the third disconnecting link is connected between the second end of breaker and hospital bus bar.
In general, the operating status for charging interval mainly includes three: inspecting state, stoppage in transit state, charging operation shape
State.As previously mentioned, when electrification interval is in the inspecting state that can be overhauled safely, other than grounding switch closure,
He disconnects all circuit switches.Wherein, the effect of grounding switch is primarily in inspecting state to route (transformation
Device) it discharges, prevent misdelivery electricity from causing security threat to service personnel in maintenance route；Normal power supply is spaced in electrification
When, grounding switch has to be off.When electrification interval is in stoppage in transit state, all circuit switches are to disconnect；Its
He then belongs to charging operation state at situation.
It further, is normally to transport respectively in fact, the charging operation state at electrification interval can be divided into several situations again
Row state, bypass turn carrier state, disconnecting link twin spans state, equipment hot stand-by duty.Wherein, between the electrification in normal operating condition
Every breaker and second disconnecting link are closed, a closure in the first first disconnecting link and the second first disconnecting link, and other circuit switches are equal
It disconnects；Turn the electrification interval of carrier state in bypass, second disconnecting link and the third disconnecting link are closed, the first first disconnecting link and the second first disconnecting link
In a closure, other circuit switches disconnect；Electrification interval in disconnecting link twin spans state, the first first disconnecting link and
A closure in diformazan disconnecting link, other circuit switches disconnect；Electrification interval in equipment hot stand-by duty, second knife
Lock is closed, and a closure in the first first disconnecting link and the second first disconnecting link, other circuit switches disconnect.
As described above, MCU2 can be equal in all circuit switches in power transformation O&M safety alarm device provided herein
When disconnection, determine that the electrification interval is in stoppage in transit state；Determine that the electrification interval is in maintenance in only grounding switch closure
State；And determine that the electrification interval is in charging operation state in other cases.Also, MCU2 can also be according to above content pair
Electrification interval is specifically further judged in any charging operation state.
Certainly, other than these above-mentioned common circuit switches, detection circuit 1 can also be directed to some other circuit switch
On off operating mode detected, such as some passive auxiliary contacts in electrification interval, those skilled in the art can voluntarily select
And be arranged, the application is not limited thereto.
After obtaining operating status locating for electrification interval, MCU2 can generate corresponding circuit state indication signal simultaneously
It is sent to circuit state attention device, to be shown, so that service personnel be enabled to learn the operating status at the electrification interval, is avoided
Into the electrification interval for being in non-inspecting state (especially charging operation state).
Wherein, described circuit state attention device is specifically as follows following any one or any combination: indicator light is shown
Display screen, phonetic alarm.
Specifically, the operating status at electrification interval can be shown by light using indicator light；Can then it be led to using display screen
Text or image etc. are crossed to show the operating status at electrification interval；Electrification can be then broadcasted by voice using phonetic alarm
The operating status at interval.Those skilled in the art voluntarily can select and be arranged, and the application is not limited thereto.For display
Screen, specifically can be used LCM screen, OLED screen or touch screen etc., wherein preferably use cheap, durable, small power consumption, word
The big LCM screen of body.For phonetic alarm, common voice module chip has WT588DM01, WTV020-SD, WT2003M03
Deng, it is preferable that the WT2003M03 that can be used and put power height outside, support plug-in storage.
It it should be added that, can be specially also this Shen for convenience of the reliability and stability for using simultaneously stiffening device
It please the dedicated device housings of provided power transformation O&M safety alarm device setting.Common sheathing material includes engineering plastics
Alloy, Carbon fibe, almag etc., wherein preferably, can be used that mechanical strength is best, thermal coefficient is big, excellent heat dissipation performance
Almag, also, recommend but be not limited to using corrosion resistance is strong, solderability is strong, high mechanical strength 5083 type almags.
Power transformation O&M safety alarm device provided herein includes the circuit switch electrical couplings in being spaced with electrification
Detection circuit, switch on-off state for detection circuit, generate and send corresponding intake to MCU；With detection circuit
The MCU of connection for judging the circuit state at electrification interval according to the on off operating mode of circuit switch, and generates corresponding circuit shape
State indication signal；The circuit state attention device being connect with MCU, the circuit state indication signal sent for receiving and showing MCU.
As it can be seen that the application can determine that out the locating electricity in electrification interval by the on off operating mode of each circuit switch in detection electrification interval
Line state, and then shown using circuit state attention device, it is not only convenient and simple but also reliable and stable, it can effectively prevent overhauling
Personnel are strayed into the electrification interval in non-inspecting state, have effectively ensured personal safety and equipment safety.
On the basis of the above, in power transformation O&M safety alarm device provided herein, it is preferable that detection electricity
Road 1 specifically with the auxiliary contact electrical couplings of circuit switch.
Specifically, the main contacts of auxiliary contact and circuit switch is to carry out switch motion simultaneously, therefore be usually used in detecting.
In the present embodiment, detection circuit 1 can obtain the on off operating mode of circuit switch main contacts by the on-off of auxiliary contact.
Moreover it is preferred that detection circuit 1 is specially light-coupled isolation detection circuit.
Specifically, in order to reduce circuit coupled interference, in the present embodiment, detection circuit 1 is specifically using light-coupled isolation
The acquisition of element progress intake.Table 2 gives several common isolation optocoupler elements.By comparing, cost is preferably used
Low, fireballing TLP521.Referring to FIG. 3, Fig. 3 is a kind of circuit structure of light-coupled isolation detection circuit provided herein
Figure.Wherein, specifically used 10 isolation optocoupler element TLP521 have carried out the acquisition of intake in Fig. 3.
Table 2
Wherein, used capacity cell is recommended to use tantalum capacitor.Compared to electrolytic capacitor and monolithic capacitor, tantalum capacitor with
Tantalum metal is medium, has the advantages that explosion-proof, capacitance is big, self-healing ability is strong.In addition, relevant connecting terminal is recommended but is not limited to
Using at low cost, electric conductivity is strong, 5.08 terminals more than number of rows.
On the basis of the above, in power transformation O&M safety alarm device provided herein, it is preferable that detection electricity
The cabinet door travel switch electrical couplings at road 1 and electrification interval generate and send for detecting the on off operating mode of cabinet door travel switch
Corresponding intake is to MCU2；MCU2 is also used to judge whether cabinet door is opened according to the on off operating mode of cabinet door travel switch, and
When the circuit state at judgement electrification interval is not inspecting state and cabinet door opening, generates alarm signal and be simultaneously sent to circuit state police
Show that device is alerted.
Specifically, detection circuit 1 can also carry out status monitoring to cabinet door travel switch, to monitor electrification interval constantly
Cabinet door whether be opened.It opens, then can be reported at once when MCU2 determines the cabinet door at electrification interval in non-inspecting state
It is alert, to prevent service personnel to enter the electrification interval in time.
On the basis of the above, in power transformation O&M safety alarm device provided herein, it is preferable that further include
For the first power circuit for detection circuit 1 and MCU2 power supply and the second electricity for powering for circuit state attention device 3
Source circuit.
Specifically, it in order to reduce interfering with each other between circuit, in the present embodiment, can specifically utilize and the first power circuit
Mutually isolated independent second source circuit is individually for circuit state attention device 3 (especially phonetic alarm) power supply.Specifically ask
With reference to Fig. 4 and Fig. 5, Fig. 4 is the circuit structure diagram of the first power circuit of one kind provided herein, and Fig. 5 is mentioned by the application
A kind of circuit structure diagram of the second source circuit supplied；Wherein, export 5V's after the first power circuit is depressured 24V electricity
VCC is that detection circuit 1 and MCU2 power, and output VCC2 is phonetic alarm confession after second source circuit is depressured 24V electricity
Electricity.
The type of common 24V power supply has forced heat radiation DC power supply, radiate DC power supply, guide rail DC power supply etc. entirely,
The application is preferably but not limited to using full heat dissipation DC power supply high-efficient, easy for installation and without forced heat radiation, such as specifically
S-120W model can be used.As for power voltage step down chip, recommends but be not limited to use isolation with isolation effect and high-efficient
Power supply chip, such as VRB2405ZP-6WR3 model can be used.
On the basis of the above, in power transformation O&M safety alarm device provided herein, it is preferable that circuit shape
The driving circuit of state attention device 3 is relay drive circuit.
Specifically, circuit state attention device 3 can specifically be driven using relay.Specifically referring to FIG. 6, Fig. 6 is this
A kind of circuit structure diagram of the driving circuit of circuit state attention device 3 provided by applying.Common relay includes solid-state
Relay, electromagnetic relay etc., it is preferable that at low cost, fast response time electromagnetic relay can be used in the application.
On the basis of the above, in power transformation O&M safety alarm device provided herein, it is preferable that further include
The remote communication circuit being connect with MCU, the circuit state message for generating and sending MCU be sent to remote monitoring terminal into
Row display.
Specifically, since the remote monitoring terminal distance high-voltage transformation cabinet in duty room has a certain distance, In
In the present embodiment, power transformation O&M safety alarm device can also will charge the circuit state message at interval using remote communication circuit
It (specifically may include the on off operating mode of the on off operating mode of each circuit switch, the circuit state at electrification interval, cabinet door travel switch
Deng) it is sent to remote monitoring terminal, so that the operator on duty in duty room learns the concrete condition at electrification interval in time.
Common remote communication circuit includes RS485 telecommunication circuit, 232 telecommunication circuits, TTL telecommunication circuit etc., wherein
Preferably, it can be used and support networking and the remote RS485 telecommunication circuit of communication distance.Specifically referring to FIG. 7, Fig. 7 is the application institute
A kind of wiring diagram of the RS485 telecommunication circuit provided.Certainly, SP485 or MAX485 etc. can also be used in those skilled in the art
The chip of other models realizes that RS485 telecommunication circuit, the application are not defined.Adaptable, Fig. 8 is mentioned by the application
The wiring diagram of the MCU supplied a kind of, Fig. 9 are a kind of wiring diagram of phonetic alarm provided herein.
Each embodiment is described in a progressive manner in the application, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.
It should be noted that in present specification, the relational terms of such as " first " and " second " etc are used merely to
One entity or operation and another entity or operate is distinguished, without necessarily requiring or implying these entities or
There are any actual relationship or orders between person's operation.In addition, the terms "include", "comprise" or its any other
Variant is intended to non-exclusive inclusion, so that including that process, article or the equipment of a series of elements not only include
Those elements, but also including other elements that are not explicitly listed, or further include for this process, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, article or equipment including the element.
Technical solution provided herein is described in detail above.Specific case used herein is to this Shen
Principle and embodiment please is expounded, the above embodiments are only used to help understand the application's and its core
Thought.It should be pointed out that for those skilled in the art, under the premise of not departing from the application principle, also
Can to the application, some improvement and modification can also be carried out, these improvement and modification are also fallen into the protection scope of the application.
Claims (10)
1. a kind of power transformation O&M safety alarm device characterized by comprising
With electrification interval in circuit switch electrical couplings detection circuit, for detecting the on off operating mode of the circuit switch,
Corresponding intake is generated and sent to MCU；
The MCU being connect with the detection circuit, for being judged between the electrification according to the on off operating mode of the circuit switch
Every circuit state, and generate corresponding circuit state indication signal；
The circuit state attention device being connect with the MCU, the circuit state instruction sent for receiving and showing the MCU
Signal.
2. power transformation O&M safety alarm device according to claim 1, which is characterized in that the detection circuit is specifically and institute
State the auxiliary contact electrical couplings of circuit switch.
3. power transformation O&M safety alarm device according to claim 1, which is characterized in that the circuit switch includes open circuit
Device, the first first disconnecting link, the second first disconnecting link, second disconnecting link, the third disconnecting link and grounding switch；The first first disconnecting link is connected to the first bus
Between the first end of the breaker, the second first disconnecting link be connected to the second bus and the breaker first end it
Between, the second end of the breaker is grounded by the grounding switch, and the second disconnecting link is connected to the second end of the breaker
Between substation's output line trackside, third disconnecting link is connected between the second end and hospital bus bar of the breaker.
4. power transformation O&M safety alarm device according to claim 3, which is characterized in that the detection circuit and the band
The cabinet door travel switch electrical couplings at electricity interval generate and send pair for detecting the on off operating mode of the cabinet door travel switch
The intake answered is to the MCU.
5. power transformation O&M safety alarm device according to claim 1, which is characterized in that the circuit state attention device packet
Include following any one or any combination:
Indicator light, display screen, phonetic alarm.
6. power transformation O&M safety alarm device according to claim 5, which is characterized in that further include for being the detection
The first power circuit that circuit and the MCU power and the second source electricity for powering for the circuit state attention device
Road.
7. power transformation O&M safety alarm device according to claim 5, which is characterized in that the circuit state attention device
Driving circuit is relay drive circuit.
8. power transformation O&M safety alarm device according to claim 1, which is characterized in that the detection circuit is specially light
Coupling isolation detection circuit.
9. power transformation O&M safety alarm device according to any one of claims 1 to 8, which is characterized in that further include:
The remote communication circuit connecting with the MCU, the circuit state message for generating and sending the MCU are sent to far
Range monitoring terminal is shown.
10. power transformation O&M safety alarm device according to claim 9, which is characterized in that the remote communication circuit tool
Body is RS485 telecommunication circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920016960.5U CN209627052U (en) | 2019-01-04 | 2019-01-04 | A kind of power transformation O&M safety alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920016960.5U CN209627052U (en) | 2019-01-04 | 2019-01-04 | A kind of power transformation O&M safety alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209627052U true CN209627052U (en) | 2019-11-12 |
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ID=68449001
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920016960.5U Active CN209627052U (en) | 2019-01-04 | 2019-01-04 | A kind of power transformation O&M safety alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209627052U (en) |
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2019
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