CN209911450U - High-voltage live display - Google Patents
High-voltage live display Download PDFInfo
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- CN209911450U CN209911450U CN201822086439.7U CN201822086439U CN209911450U CN 209911450 U CN209911450 U CN 209911450U CN 201822086439 U CN201822086439 U CN 201822086439U CN 209911450 U CN209911450 U CN 209911450U
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Abstract
The utility model discloses a high-voltage live display belongs to electric power auxiliary assembly technical field, which comprises an outer shell, a panel, power supply, detection joint and high-pressure pilot lamp, power supply is used for establishing ties on power supply and the output circuit and has first rectification module, detection joint is used for being connected with high-voltage electrical equipment electricity, high-pressure pilot lamp locates on the panel, high-pressure pilot lamp connects with detection joint electricity and is used for instructing whether high-voltage electrical equipment is electrified, high-voltage live display still includes infrared induction module and sound induction module, connect in high-pressure pilot lamp through photoelectric coupler electricity after infrared induction module and sound induction module are parallelly connected. When personnel are close to the switch cabinet or sound is generated near the switch cabinet, the infrared sensing module detects infrared signals or the sound sensing module collects sound waves, the photoelectric coupler is electrified, the high-voltage indicating lamp is lightened, the high-voltage electrical equipment in the switch cabinet is indicated to have operating voltage, the personnel are reminded to keep a safe distance, and safety accidents are avoided.
Description
Technical Field
The utility model relates to an electric power auxiliary assembly technical field especially relates to a high-voltage live display.
Background
In the field of electric power, in order to display whether high-voltage electrical equipment such as an incoming bus, a circuit breaker, a main transformer and the like in a switch cabinet is electrified or not so as to prevent electrical misoperation, a high-voltage electrified display is required to be equipped for providing information of the voltage state of a main loop where the high-voltage electrical equipment is detected for operation and inspection personnel. When the high-voltage electrical equipment has operating voltage, the electrified display emits flashing light to remind people of paying attention to the fact that the high-voltage electrical equipment in the switch cabinet is electrified with the operating voltage, and no indication is given when the high-voltage electrical equipment is not electrified.
At present, most of electrified displays are in contact type, a neon lamp is commonly used as a display element, the fault rate is high, the service life is short, the effect is poor, a high-voltage sensor of the electrified display is directly connected with high-voltage electrical equipment, and secondary voltage is obtained by adopting capacitance voltage division. Due to the high humidity and salinity of coastal areas, dust can adhere to the surface of the high-voltage sensor. Once the adhered dust is affected with damp, the leakage current is increased, the potential or voltage is raised, and the secondary loop of the charged display introduces high voltage, thereby causing the capacitive breakdown and soft breakdown accidents of the high-voltage sensor. When the intelligent monitoring system is used, the operation personnel directly press the switch with hands to obtain the working condition, so that the life safety can be endangered, and even the power failure accident of the equipment can be caused.
Because the high-voltage sensor of the existing electrified display is directly connected with high-voltage electrical equipment, potential safety hazards exist, non-contact high-voltage electrified displays are designed and produced by some manufacturers, incoming line buses are subjected to signal amplification within a certain distance range by using the electromagnetic induction principle, and the purpose of controlling a driving device of the electrified display is achieved. However, the signal detection is disturbed due to the variation of medium parameters such as temperature and humidity in the air. Moreover, the electric field sensor of the non-contact type electrified display needs to keep a certain safety distance with the incoming line bus, the installation precision requirement of the non-contact type electrified display is high, the existing switch cabinet does not have enough space for installing the non-contact type electrified display, and the cost is huge and the non-contact type electrified display is not practical if the existing switch cabinet needs to be replaced.
SUMMERY OF THE UTILITY MODEL
In order to solve the shortcoming and the deficiency that exist among the above-mentioned prior art, the utility model provides a can realize that non-contact triggers and be applicable to the high voltage live display of current cubical switchboard.
In order to realize the technical purpose, the utility model provides a high-voltage live display, including the shell, locate panel, power supply, detection joint and the high-pressure pilot lamp of shell one side, power supply is used for the power supply, and it has first rectifier module to establish ties on power supply's the output circuit, and detection joint is used for being connected with high-voltage electrical equipment electricity, and the high-pressure pilot lamp is located on the panel, and the high-pressure pilot lamp is connected with the detection joint electricity and is used for instructing whether high-voltage electrical equipment is electrified, the high-voltage live display still includes infrared induction module and sound induction module, connects in high-pressure pilot lamp through photoelectric coupler electricity after infrared induction module and sound induction module are parallelly connected.
Preferably, the infrared induction modules are arranged in the shell, the panel is provided with a window corresponding to the infrared induction modules, and the sound induction modules are fixed on the panel.
Preferably, the sound sensing module comprises a sound sensor and a voltage-current conversion unit which are connected in series.
Preferably, the infrared sensing module comprises an infrared sensor, a signal amplifying unit and a shaping unit which are connected in series.
Preferably, a delay control module is arranged on a circuit which is electrically connected with the photoelectric coupler after the infrared sensing module and the sound sensing module are connected in parallel.
Preferably, the output circuit of the power supply is connected in series with a first rectification module.
Preferably, the high-voltage electrified display further comprises a power indicator lamp for indicating whether the power supply is normal, and the power indicator lamp is electrically connected to the output circuit of the power supply.
Preferably, the high-voltage charged display further comprises a storage battery, and the storage battery supplies power when the power supply fails.
Preferably, the high-voltage electrified display further comprises a safety switch, a control module for controlling the safety switch, a locking indicator lamp and an unlocking indicator lamp, wherein the locking indicator lamp and the unlocking indicator lamp are used for indicating the state of the safety switch, the locking indicator lamp and the unlocking indicator lamp are electrically connected to the control module, the locking indicator lamp and the control module are electrically connected to the detection connector, and the infrared induction module and the sound induction module are electrically connected to the locking indicator lamp through a photoelectric coupler after being connected in parallel.
After the technical scheme is adopted, the utility model has the advantages of as follows:
1. the utility model provides a high-voltage live display improves the concrete structure of current non-contact high-voltage live display, adopts infrared induction module and sound induction module to regard as trigger information's detection module simultaneously, realizes the purpose that non-contact triggered. The high-voltage indicator lamp is electrically connected with the high-voltage electrical equipment through the detection connector and is in an extinguishing state in a normal state. When personnel are close to the switch cabinet or sound is generated near the switch cabinet, the infrared sensing module detects infrared signals or the sound sensing module collects sound waves, the photoelectric coupler is electrified, the high-voltage indicating lamp is lightened, the high-voltage electrical equipment in the switch cabinet is indicated to have operating voltage, the personnel are reminded to keep a safe distance, and safety accidents are avoided. Because the infrared sensing module and the sound sensing module are not influenced by the temperature, the humidity and other parameters of the air, a specific safety distance does not need to be kept between the infrared sensing module and the high-voltage electrical equipment, the installation precision requirement is not high, the infrared sensing module and the sound sensing module can be widely applied to the existing switch cabinet, and the actual application can be well met.
2. The sound response module is including the sound sensor and the voltage current conversion unit of establishing ties, and the sound sensor produces signal voltage under the effect of sound wave, utilizes voltage current conversion unit to convert signal voltage into signal current, utilizes this signal current can switch on photoelectric coupler, realizes triggering the purpose of high pressure pilot lamp smoothly.
3. The infrared induction module comprises an infrared sensor, a signal amplification unit and a shaping unit which are connected in series, after the infrared sensor detects an infrared signal, the infrared signal detected by the infrared sensor is amplified and adjusted through the signal amplification unit and the shaping unit to be converted into a signal current capable of enabling the photoelectric coupler to be conducted, and the purpose of smoothly triggering the high-voltage indicator lamp is achieved.
4. After the personnel leave the detection scope of infrared induction module or the sound near the cubical switchboard disappears, through the suitable extension high-pressure pilot lamp's of the time delay control module who establishes in addition display time, better satisfying warning operation requirement.
5. When the power supply fails, the additionally arranged storage battery is used as a standby power supply to supply power to all electric elements of the high-voltage electrified display, so that the high-voltage electrified display can normally operate under the condition that the power supply fails.
6. Safety switch is arranged in the switching of control switch cabinet door, and when high-voltage electrical equipment had operating voltage, control module made safety switch lock the cabinet door, appeared in infrared induction module's detection range or near cubical switchboard when having sound when the maintainer, and the shutting pilot lamp lights, reminds the cabinet door to be in the closed condition and can't open. Under the high-voltage electrical equipment outage condition, when the maintainer appears in the detection range of infrared induction module or near cubical switchboard has sound, the unblock pilot lamp lights, reminds the cabinet door to be in openable state, and the maintainer can directly open the cabinet door and overhaul the inside high-voltage electrical equipment of cubical switchboard. The safety of operation when further improving the maintenance through safety switch and control module avoids taking place the incident.
Drawings
Fig. 1 is a partial structure diagram of a high voltage display according to an embodiment of the present invention;
fig. 2 is a schematic view of a panel portion of a high voltage live display according to an embodiment of the present invention;
fig. 3 is a control schematic diagram of a high voltage live display according to an embodiment of the present invention;
fig. 4 is a schematic view of a switch cabinet according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of the safety switch installed on the switch cabinet in the high-voltage live display according to the embodiment of the present invention.
In the figure, 110-cabinet body, 120-cabinet door, 121-mounting opening, 122-long hole, 200-high voltage charged display, 210-shell, 220-panel, 221-window, 230-fixed hole, 300-infrared induction module, 400-sound induction module, 1-power supply, 2-detection joint, 3-high voltage indicator light, 4-infrared sensor, 5-first rectification module, 6-voltage reduction module, 7-first photoelectric coupler, 8-signal amplification unit, 9-shaping unit, 10-time delay control module, 11-power indicator light, 12-power failure detection module, 13-failure indicator light, 14-second photoelectric coupler, 15-voltage reduction resistor, 16-safety switch, 161-locking pin, 162-spring, 163-locking block, 164-electromagnetic block, 165-locking hole, 166-limiting sleeve, 17-control module, 18-locking indicator light, 19-unlocking indicator light, 20-second rectifying module, 21-third photoelectric coupler, 22-fourth photoelectric coupler, 23-storage battery, 24-sound sensor and 25-voltage-current conversion unit.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments. It is to be understood that the following terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like are used in an orientation or positional relationship relative to one another only as illustrated in the accompanying drawings and are used merely for convenience in describing and simplifying the invention, and do not indicate or imply that the device/component so referred to must have a particular orientation or be constructed and operated in a particular orientation and therefore should not be considered as limiting the invention.
Example one
As shown in fig. 1 to 3, the embodiment of the present invention provides a high voltage live display 200, including shell 210, locate panel 220, power supply 1, detection joint 2 and high pressure indicator lamp 3 of shell one side, power supply 1 is used for supplying power, and detection joint 2 is used for being connected with high voltage electrical equipment electricity, and high pressure indicator lamp 3 is located on panel 220, and high pressure indicator lamp 3 is connected with detection joint 2 electricity and is used for instructing whether high voltage electrical equipment is electrified. The high-voltage charged display of the embodiment further comprises an infrared induction module 300 and a sound induction module 400, wherein the infrared induction module 300 and the sound induction module 400 are connected in parallel and then electrically connected to the high-voltage indicator lamp 3 through a first photoelectric coupler 7.
The high-voltage indicating lamp is in the off state under the normal state, and when personnel near cubical switchboard or cubical switchboard had the sound of certain decibel, infrared induction module detected infrared signal or sound induction module and gathered the sound wave after, the circular telegram of first photoelectric coupler, the high-voltage indicating lamp lights, shows that the high-voltage electrical equipment in the cubical switchboard has operating voltage, reminds personnel to keep safe distance, avoids taking place the incident. Because the infrared sensing module and the sound sensing module are not influenced by the temperature, the humidity and other parameters of the air, a specific safety distance does not need to be kept between the infrared sensing module and the high-voltage electrical equipment, the installation precision requirement is not high, the infrared sensing module and the sound sensing module can be widely applied to the existing switch cabinet, and the actual application can be well met.
In this embodiment, three detection joints 2 are provided, and correspond to the phases a, B, and C of the high-voltage electrical equipment, respectively. During the use, three detection connector 2 electricity respectively connects in the cubical switchboard three-phase of inlet wire generating line. Correspondingly, the high-voltage indicator lamp 3 is also provided with three, is connected with three detection joint 2 one-to-one electricity, and the high-voltage indicator lamp ground connection sets up. For the sake of convenience of distinction, the detection tabs and the high pressure indicator light corresponding to a are indicated by yellow, the detection tabs and the high pressure indicator light corresponding to B are indicated by green, and the detection tabs and the high pressure indicator light corresponding to C are indicated by red. Preferably, the high-voltage indicator lamp 3 is an LED lamp.
In this embodiment, the power supply 1 is powered by commercial power, and in order to make the supply current meet the use requirement, the output circuit of the power supply is connected in series with a first rectifying module 5, which is used for rectifying the alternating current into direct current.
In this embodiment, the infrared sensing module 300 is disposed in the housing 210, the panel 220 is provided with a window 221 corresponding to the infrared sensing module, the window is provided with transparent glass, and the sound sensing module 400 is fixed on the panel 220.
In this embodiment, the infrared sensing module 300 includes an infrared sensor 4, a signal amplifying unit 8 and a shaping unit 9 connected in series. After the infrared sensor 4 detects an infrared signal, the infrared signal detected by the infrared sensor is amplified and adjusted by the signal amplifying unit 8 and the shaping unit 9 to be converted into a signal current which can turn on the first photoelectric coupler 7. The sound sensing module 400 includes a sound sensor 24 and a voltage-current conversion unit 25 connected in series, the sound sensor 24 generates a signal voltage under the action of sound waves, the signal voltage is converted into a signal current by the voltage-current conversion unit 25, and the first photocoupler 7 can be turned on by the signal current.
In order to meet the purpose that the high-voltage indicator lamp 3 can continue to prompt after a maintainer leaves the detection distance of the infrared induction module 4 or the sound near the switch cabinet disappears, the delay control module 10 is connected in series on a circuit which is electrically connected with the first photoelectric coupler 7 after the infrared induction module 300 and the sound induction module 400 are connected in parallel. In this embodiment, the delay control module 10 may adopt a delay relay, and when the detection distance that the maintainer leaves the infrared sensing module 4 or the sound near the switch cabinet disappears, the delay relay is turned off after delaying for 3s to 10s, so that the high-voltage indicator lamp 3 is turned off after delaying for 3s to 10 s.
Since the operating voltages of the infrared sensing module 300 and the sound sensing module 400 are relatively low, the voltage reduction module 6 is connected in series to the first rectification module 5 on the output circuit for supplying power to the infrared sensing module 300 and the sound sensing module 400, and specifically, the voltage reduction module 6 may be a dc voltage reducer.
In order to indicate whether the power supply 1 can supply power normally, the high-voltage live display 200 further includes a power indicator lamp 11 for indicating whether the power supply 1 is normal. In this embodiment, the power indicator 11 is electrically connected to the voltage-reducing module 6.
In order to timely remind the maintainer when the power supply 1 fails, the high-voltage live display 200 further comprises a power failure detection module 12 and a fault indicator lamp 13, wherein the power failure detection module 12 is electrically connected to the power supply 1 and is used for detecting whether the power supply fails, and the fault indicator lamp 13 is electrically connected to the power failure detection module 12 and is used for displaying whether the power supply 1 fails.
In this embodiment, for convenience of distinguishing, the power indicator 11 may be a green light, the fault indicator 13 may be a red light, and the power indicator 11 and the fault indicator 13 are mounted on the panel 220. The power failure detection module 12 is electrically connected to the output end of the first rectification module 5 through a second photoelectric coupler 14, and the power failure detection module 12 is electrically connected to a circuit of the first rectification module 5 and is further provided with a voltage reduction resistor 15.
In order to normally operate the whole high-voltage live display when the power supply 1 fails, the high-voltage live display 200 is further provided with a storage battery 23. When the power supply 1 fails, the additionally arranged storage battery 23 serves as a standby power supply to supply power to all power utilization elements, so that the whole high-voltage live display can normally operate under the condition that the power supply fails.
In order to improve the safety of the overhaul, the high-voltage live display 200 further comprises a safety switch 16, a control module 17 for controlling the safety switch, a locking indicator lamp 18 and an unlocking indicator lamp 19 for indicating the state of the safety switch, wherein the locking indicator lamp 18 and the unlocking indicator lamp 19 are controlled by the control module 17. The lock indicator light 18 and the unlock indicator light 19 are electrically connected to the control module 17.
In this embodiment, the safety switch 16 is disposed outside the housing and used for controlling the opening and closing of the cabinet door in the switch cabinet. The locking indicator lamp 18 is electrically connected to the detection connector 2 through the second rectifier module 20, and the locking indicator lamp 18 is electrically connected to the delay control module 10 through the third photocoupler 21. The control module 17 is electrically connected to the output end of the first rectifying module 5, the control module 17 is electrically connected to the second rectifying module 20 through a fourth photoelectric coupler 22, and the second rectifying module 20 is grounded.
In this embodiment, the power indicator 11, the fault indicator 13, the lock indicator 18 and the unlock indicator 19 are all disposed on the panel 220.
With reference to fig. 4 and 5, the switch cabinet includes a cabinet body 110 and a cabinet door 120 for opening and closing the cabinet body, wherein the cabinet door is provided with a mounting opening 121 for mounting the high-voltage live display 200, and the mounting opening is matched with the housing 210. The high-voltage electrified display 200 is fixed at the mounting opening 121 on the cabinet door 120 through screws, the cabinet door 120 is provided with a plurality of long holes 122 uniformly distributed on the periphery of the mounting opening 121, and the high-voltage electrified display 200 is provided with fixing holes 230 for screws to be screwed in.
The safety switch 16 includes a lock pin 161, a spring 162, a lock block 163 and an electromagnetic block 164, the lock pin 161 is movably disposed on the back of the cabinet door 120, one end of the spring 162 is disposed in a fixed position, and the other end of the spring 162 contacts with the lock pin, the lock block 163 is disposed inside the cabinet body 110, the lock block 163 is provided with a lock hole 165 into which the lock pin 161 is inserted, the electromagnetic block 164 is electrically connected to the control module 17 and is used for driving the lock pin 162, and the lock pin 161 is inserted into the lock hole 165 when the high-voltage.
In this embodiment, a limiting sleeve 166 is fixed on the back of the cabinet door 120, the pin 161 is transversely movably installed in the limiting sleeve 166, the spring 162 is installed in the limiting sleeve, one end of the spring 162 is fixed on the inner wall of the limiting sleeve, and the other end of the spring 162 is fixedly connected to one end of the pin 161. The locking block 163 is fixed to the inside of the cabinet 110 by screws, and the electromagnetic block 164 is provided inside the locking block. When the high-voltage electrical equipment is powered on, the control module 17 enables the electromagnetic block 164 to be powered on, the lock pin 161 is inserted into the lock hole 165 on the lock block 163 under the magnetic force action of the electromagnetic block 164, and the cabinet door 120 cannot be opened. When the high-voltage electrical equipment is powered off, the control module 17 enables the electromagnetic block 164 to be powered off, the electromagnetic force action of the electromagnetic block 164 on the lock pin 161 disappears, the lock pin 161 resets under the action of the spring 162 to exit the lock hole 165, the cabinet door 120 is in a state capable of being opened, and an maintainer can open the cabinet door to overhaul electrical elements inside the switch cabinet.
Under the high-voltage electrical equipment in the cubical switchboard had the operating voltage condition, when the maintainer got into in infrared induction module 4's the detection range or near the cubical switchboard had the sound that reaches the detection decibel, infrared induction module 300 or sound induction module 400 produced the sensing signal, and first photoelectric coupler 7 switches on, and high pressure pilot lamp 3 lights, reminds the high-voltage electrical equipment in the maintainer cubical switchboard to have operating voltage. Meanwhile, the third photoelectric coupler 21 is turned on, the locking indicator lamp 18 is turned on, and the cabinet door 120 of the switch cabinet for the maintainer is reminded of being in a closed state and cannot be opened.
Under the condition of power failure of high-voltage electrical equipment in the switch cabinet, when a maintainer appears in the detection range of the infrared sensing module 300 or when sound reaching detection decibels is generated near the switch cabinet, the high-voltage indicator lamp 3 and the locking indicator lamp 18 are in a normally-off state. Meanwhile, the fourth photoelectric coupler 22 is still in a disconnected state, the control module 17 provides current to the unlocking indicator lamp 19 according to the disconnection information of the fourth photoelectric coupler 22 to enable the unlocking indicator lamp to be electrified and lighted, so that the cabinet door of an overhaul worker is reminded of being in a openable state, the control module 17 cuts off the current of the safety switch 16 at the same time, the electromagnetic block 164 is powered off, the lock pin 161 exits from the lock hole 165 under the action of the spring 162, and the overhaul worker can directly open the cabinet door 120 to overhaul high-voltage electrical equipment in the switch cabinet.
It is understood that the detection connector 2 may be a power connector or the like, and of course, the detection connector may also be a current sensor or a voltage sensor.
It is understood that the first and second rectifier modules 5 and 20 may employ existing rectifiers.
It is understood that other reasonable voltage reducing structures in the prior art can be adopted for the voltage reducing module 6.
It is understood that the signal amplification unit 8 may employ an existing infrared sensing amplifier.
It will be appreciated that the shaping unit 9 may employ existing rectifiers.
It will be appreciated that other reasonable delay power configurations known in the art may be used for the delay control module 10.
It is understood that the power failure detection module 12 may adopt a reasonable structure such as a power failure detection circuit in the prior art.
It is understood that the control module 17 may employ a PLC controller.
It is understood that the back of the cabinet door 120 refers to the plane of the cabinet door facing the interior of the cabinet 110.
In addition to the above preferred embodiments, the present invention has other embodiments, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope defined by the appended claims.
Claims (6)
1. The high-voltage electrified display is characterized by further comprising an infrared induction module and a sound induction module, wherein the infrared induction module and the sound induction module are connected in parallel and then are electrically connected to the high-voltage indicator lamp through a photoelectric coupler; the sound sensing module comprises a sound sensor and a voltage-current conversion unit which are connected in series; a delay control module is arranged on a circuit which is electrically connected with the photoelectric coupler after the infrared induction module and the sound induction module are connected in parallel; the high-voltage electrified display further comprises a safety switch, a control module for controlling the safety switch, a locking indicator lamp and an unlocking indicator lamp, wherein the locking indicator lamp and the unlocking indicator lamp are used for indicating the state of the safety switch, the locking indicator lamp and the unlocking indicator lamp are electrically connected to the control module, the locking indicator lamp and the control module are electrically connected to the detection connector, and the infrared induction module and the sound induction module are electrically connected to the locking indicator lamp through a photoelectric coupler after being connected in parallel.
2. The high-voltage charged display device according to claim 1, wherein the infrared sensing modules are all disposed in the housing, the panel is provided with a window corresponding to the infrared sensing module, and the sound sensing module is fixed on the panel.
3. The high-voltage charged display of claim 1, wherein the infrared sensing module comprises an infrared sensor, a signal amplifying unit and a shaping unit connected in series.
4. The high-voltage live display according to claim 1, wherein a first rectifying module is connected in series to an output circuit of the power supply.
5. The high voltage live display according to claim 1, further comprising a power indicator for indicating whether the power supply is normal, wherein the power indicator is electrically connected to an output circuit of the power supply.
6. The high voltage live display according to claim 1, further comprising a battery that supplies power when the power supply fails.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822086439.7U CN209911450U (en) | 2018-12-12 | 2018-12-12 | High-voltage live display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822086439.7U CN209911450U (en) | 2018-12-12 | 2018-12-12 | High-voltage live display |
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| CN209911450U true CN209911450U (en) | 2020-01-07 |
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| CN201822086439.7U Active CN209911450U (en) | 2018-12-12 | 2018-12-12 | High-voltage live display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313236A (en) * | 2022-09-16 | 2022-11-08 | 广东电网有限责任公司 | Safety prompter for switch cabinet and switch cabinet |
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2018
- 2018-12-12 CN CN201822086439.7U patent/CN209911450U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313236A (en) * | 2022-09-16 | 2022-11-08 | 广东电网有限责任公司 | Safety prompter for switch cabinet and switch cabinet |
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