CN113156187A - Electrified display device of GIS equipment - Google Patents
Electrified display device of GIS equipment Download PDFInfo
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- CN113156187A CN113156187A CN202010015183.XA CN202010015183A CN113156187A CN 113156187 A CN113156187 A CN 113156187A CN 202010015183 A CN202010015183 A CN 202010015183A CN 113156187 A CN113156187 A CN 113156187A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 238000012423 maintenance Methods 0.000 claims abstract description 15
- 238000009434 installation Methods 0.000 claims abstract description 14
- 230000008878 coupling Effects 0.000 claims abstract description 10
- 238000010168 coupling process Methods 0.000 claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 claims abstract description 10
- 230000005684 electric field Effects 0.000 claims abstract description 10
- 230000000903 blocking effect Effects 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
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Abstract
一种GIS设备带电显示装置，属安全装置领域。包括传感器、信号屏蔽线、输入保护电路、自检电路、信号处理电路、显示电路、控制电路、闭锁电路和开关电源；所述的GIS设备带电显示装置采用非接触式的电场耦合模式，对GIS设备的各相分别进行监测，并同时具有闭锁对应GIS设备接地闸刀的功能，以弥补老式GIS设备五防闭锁不完善的缺陷。其能够直观地监测、显示所在GIS设备是否带电，并能够根据“五防”规则对所在GIS设备的接地装置是否允许投入进行逻辑联锁；整个装置安装在GIS设备的外部，维护和安装均不需要停电打开设备筒体即可进行，增加了电力系统运行的可靠性。可广泛用于GIS设备的运行监控和“五防”联锁控制领域。
An electrified display device for GIS equipment belongs to the field of safety devices. Including sensors, signal shielding lines, input protection circuits, self-checking circuits, signal processing circuits, display circuits, control circuits, blocking circuits and switching power supplies; the GIS equipment electrified display device adopts a non-contact electric field coupling mode, and the GIS equipment Each phase of the equipment is monitored separately, and at the same time, it has the function of blocking the grounding knife of the corresponding GIS equipment, so as to make up for the imperfect five-proof blocking of the old GIS equipment. It can intuitively monitor and display whether the GIS equipment is energized, and can logically interlock whether the grounding device of the GIS equipment is allowed to be put into operation according to the "five prevention"rules; the whole device is installed outside the GIS equipment, and maintenance and installation are not required. It can be done by opening the equipment cylinder when the power is cut off, which increases the reliability of the power system operation. It can be widely used in the operation monitoring of GIS equipment and the "five-proof" interlocking control field.
Description
Technical Field
The invention belongs to the field of safety devices, and particularly relates to a device for detecting whether GIS equipment is electrified or not.
Background
In the operation process of a power system and power equipment, a five-prevention function is a necessary safety measure for preventing misoperation.
In an electrical power system, the "five prevention" function typically includes:
1. the circuit breaker is prevented from being wrongly opened and closed;
2. the isolating switch is prevented from being pulled and closed under the load;
3. prevent the earth wire (switch) from being electrified (hung);
4. prevent the circuit breaker (isolating switch) from being closed with the grounding wire (switch);
5. prevent the wrong entering into the electrified interval.
In order to ensure the reliable implementation of the "five-prevention" function, in the power system, it is generally necessary to provide a "locking point" for preventing misoperation in the control system of the high-voltage switchgear, so as to ensure the operation and running safety of the high-voltage switchgear
The locking point is a locking control point which can realize a certain function of preventing electrical misoperation on high-voltage electrical equipment in a set of misoperation preventing (anti-misoperation for short) devices. Such as an actuating element (lock, contact) of a mechanical or electrical locking device.
The anti-misoperation locking device is a mechanical device which is arranged on high-voltage electrical equipment to prevent misoperation by utilizing a self-set program locking function. The anti-mislatching apparatus generally comprises: microcomputer error prevention, electrical locking, electromagnetic locking, mechanical interlocking, mechanical program lock, mechanical lock, charged display device, etc.
GIS (gas insulated switchgear) is an English abbreviation of gas insulated totally-enclosed switchgear. The GIS is composed of a breaker, a disconnecting switch, a grounding switch, a mutual inductor, a lightning arrester, a bus, a connecting piece, an outgoing line terminal and the like, all the equipment or components are enclosed in a metal grounded shell, and SF6 insulating gas with certain pressure is filled in the metal grounded shell, so that the GIS is also called as an SF6 fully-closed combined electrical appliance.
The existing grounding disconnecting link of part of old GIS equipment has no reliable anti-misoperation locking device, not only does not meet the relevant regulations of relevant safety operation regulations, but also brings about small potential safety hazards to operation work.
And the GIS equipment of most in service now, though possess electrified display device, its electrified display device all installs the inside at the equipment barrel, at the in-process of installation and daily maintenance, all need have a power failure to open the equipment barrel, and not only work load is huge, has also influenced electric power system's steady operation simultaneously.
How on the GIS equipment of no anti-misoperation lockout device, ensure that its ground switch can realize reliable anti-misoperation lockout, and the installation, use or the maintenance of this kind of anti-misoperation lockout device need not to unpack the barrel of equipment, does not influence the normal operating of current GIS equipment, guarantees electric power system's safe, steady operation, prevents the emergence of maloperation phenomenon, accords with electric power system's "five prevent" technical requirement, is the important problem that urgently waits to be solved among the on-the-spot actual work.
Disclosure of Invention
The invention aims to provide a GIS equipment live display device. The method comprises the steps that an induction device is installed outside the GIS equipment by utilizing the principle of electric field coupling, and the running state of the GIS equipment is monitored in real time from the outside; the device has the advantages that the normal operation of the existing GIS equipment is not influenced, the power failure is not needed, or the barrel of the equipment is not required to be disassembled for installation, maintenance and overhaul, the device also has the function of locking the grounding switch blade of the GIS equipment, the defect that the five-prevention locking of the existing old GIS equipment is incomplete is overcome, and the operation reliability of a power system is improved.
The technical scheme of the invention is as follows: the utility model provides a GIS equipment live display device which characterized by:
the GIS equipment live display device comprises a sensor, a signal shielding wire, an input protection circuit, a self-checking circuit, a signal processing circuit, a display circuit, a control circuit, a locking circuit and a switching power supply;
the sensor monitors the running state of the equipment in real time by utilizing the principle of electric field coupling;
the signal shielding wire is used for transmitting a detection signal of the sensor;
the input protection circuit is used for limiting the amplitude of the received sensor monitoring signal and preventing the signal processing circuit and subsequent circuits from being damaged due to the fact that the sensor monitoring signal exceeds an allowable range;
the self-checking circuit is used for self-checking the input protection circuit, the signal processing circuit, the display circuit, the control circuit and the locking circuit to ensure that the working state of the input protection circuit is normal;
the signal processing circuit is used for converting the received sensor monitoring signal to make the received sensor monitoring signal meet the input requirement of the control circuit;
the control circuit is used for carrying out logic comparison and logic judgment according to the converted sensor monitoring signals, outputting a logic comparison result of whether the GIS equipment is electrified or not, and sending the logic comparison result to the display circuit for display;
the display circuit is used for displaying a logic comparison result and an alarm signal of whether the GIS equipment is electrified on a switch site;
the locking circuit is used for checking whether the logic state of the monitored GIS equipment is normal according to the five-prevention logic of the transformer substation;
the switching power supply provides power for the whole device.
Specifically, the electrified display device of the GIS equipment adopts a non-contact electric field coupling mode to respectively monitor each phase of the GIS equipment, and simultaneously has the function of locking a grounding switch blade corresponding to the GIS equipment, so as to make up for the defect that the five-prevention locking of the old GIS equipment is incomplete.
Furthermore, the sensor install in the outside of GIS equipment, maintenance and installation do not all need to have a power failure to open the equipment barrel and can go on, can reduce the work load of installation, maintenance or maintenance, increase the reliability of electric power system operation.
Specifically, the sensor is arranged outside a shell at the position of a wire inlet/outlet connection of the GIS equipment and the cable, the rest circuit parts are all arranged in a box body of a stainless steel metal shell, and the box body of the stainless steel metal shell is arranged on a vertical support arranged on a base of the GIS equipment, so that effective isolation of strong current and weak current is realized.
Furthermore, the connecting wires among all circuit parts of the GIS equipment live display device are arranged in the box body of the metal shell, and the power line, the signal shielding wire and the output locking contact are externally connected through the terminal, so that the overall anti-interference capacity of the device is enhanced.
Furthermore, the GIS equipment electrified display device provides two pairs of normally open contacts, and the two pairs of normally open contacts are matched with an electromagnetic lock, a mechanical program lock or a microcomputer locking anti-misoperation device to realize the logic function of forced locking.
Specifically, when the corresponding GIS equipment is electrified, the control circuit controls each corresponding phase indicator lamp to flash high and the buzzer sounds; no matter three-phase, two-phase or any phase has the electric buzzer, the alarm prompting device sounds and the alarm prompting device is electrified.
When the corresponding GIS equipment is not electrified, the control circuit controls each corresponding phase indicator lamp to be turned off, and then the buzzer does not sound.
Specifically, the GIS equipment live display device adopts split-phase control, and a forced locking signal is output when any phase is live; when the GIS equipment electrified display device loses the control power supply, a forced locking signal is also output to keep the locking state.
Furthermore, the GIS equipment live display device has a self-checking function, can automatically detect or manually detect the working states of the sensor and each functional circuit, sends out a prompt signal when each functional circuit and the sensor have any faults, outputs a forced locking signal and keeps the locking state.
Compared with the prior art, the invention has the advantages that:
1. monitoring the running state of the equipment in real time by adopting a non-contact electric field coupling mode; the intelligent control system can intuitively monitor and display whether the GIS equipment is electrified or not, and can carry out logic interlocking on whether the grounding device of the GIS equipment is allowed to be put into operation or not according to the five-prevention rule;
2. the sensor and the rest circuit parts are all arranged outside the GIS equipment, maintenance and installation can be carried out without powering off and opening the equipment barrel, the workload of installation, maintenance or repair can be reduced, and the reliability of operation of the power system is improved;
3. two pairs of normally open contacts are provided, and can be conveniently matched with an electromagnetic lock, a mechanical program lock or a microcomputer locking anti-misoperation device to realize the logic function of forced locking;
4. the automatic locking device has a self-checking function, can automatically or manually detect the working states of the sensor and each functional circuit, sends out a prompt signal when each functional circuit and the sensor have any fault, outputs a forced locking signal and keeps a locking state.
5. The device adopts split-phase control, and a forced locking signal is output when any phase is electrified; when the device loses the control power supply, a forced locking signal is also output, and the locking state is kept.
Drawings
FIG. 1 is a schematic block diagram of the system principle of the present invention.
In the figure, 1 is a GIS equipment shell, 2 is a sensor, 3 is a cable grounding shielding wire, 4 is a box body with a metal shell, 5 is locking signal output, and 6 is a power supply.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
In fig. 1, the technical solution of the present invention provides a charged display device for GIS equipment, which is characterized in that:
the GIS equipment live display device comprises a sensor, a signal shielding wire, an input protection circuit, a self-checking circuit, a signal processing circuit, a display circuit, a control circuit, a locking circuit and a switching power supply;
the sensor monitors the running state of the equipment in real time by utilizing the principle of electric field coupling;
the signal shielding wire is used for transmitting a detection signal of the sensor;
the input protection circuit is used for limiting the amplitude of the received sensor monitoring signal and preventing the signal processing circuit and subsequent circuits from being damaged due to the fact that the sensor monitoring signal exceeds an allowable range;
the self-checking circuit is used for self-checking the input protection circuit, the signal processing circuit, the display circuit, the control circuit and the locking circuit to ensure that the working state of the input protection circuit is normal;
the signal processing circuit is used for converting the received sensor monitoring signal to make the received sensor monitoring signal meet the input requirement of the control circuit;
the control circuit is used for carrying out logic comparison and logic judgment according to the converted sensor monitoring signals, outputting a logic comparison result of whether the GIS equipment is electrified or not, and sending the logic comparison result to the display circuit for display;
the display circuit is used for displaying a logic comparison result and an alarm signal of whether the GIS equipment is electrified on a switch site;
the locking circuit is used for checking whether the logic state of the monitored GIS equipment is normal according to the five-prevention logic of the transformer substation;
the switching power supply provides power for the whole device.
The electrified display device of the GIS equipment adopts non-contact electric field coupling to respectively monitor each phase of the GIS equipment, and simultaneously has the function of locking the grounding knife switch of the corresponding GIS equipment so as to make up for the defect of incomplete five-prevention locking of the old GIS equipment.
Furthermore, the sensor is installed in the outside of GIS equipment, and maintenance and installation do not need to have a power failure and open the equipment barrel and can go on, can reduce the work load of installation, maintenance or maintenance, increase the reliability of electric power system operation.
Specifically, the sensor is arranged outside a shell at the position of a wire inlet/outlet connection of the GIS equipment and the cable, the rest circuit parts are all arranged in a box body of a stainless steel metal shell, and the box body of the stainless steel metal shell is arranged on a vertical support arranged on a base of the GIS equipment, so that effective isolation of strong current and weak current is realized.
Furthermore, the connecting wires among all circuit parts of the GIS equipment live display device are arranged in the box body of the metal shell, and the power line, the signal shielding wire and the output locking contact are externally connected through the terminal, so that the overall anti-interference capacity of the device is enhanced.
Furthermore, the GIS equipment live display device provides two pairs of normally open contacts, and the two pairs of normally open contacts are matched with an electromagnetic lock, a mechanical program lock or a microcomputer locking anti-misoperation device to realize the logic function of forced locking.
Specifically, when the corresponding GIS equipment is electrified, the control circuit controls each corresponding phase of indicator lamp to flash high and the buzzer sounds; no matter three-phase, two-phase or any phase has the electric buzzer, the alarm prompting device sounds and the alarm prompting device is electrified.
When the corresponding GIS equipment is not electrified, the control circuit controls each corresponding phase indicator lamp to be turned off, and then the buzzer does not sound.
Specifically, the GIS equipment live display device adopts split-phase control, and a forced locking signal is output when any phase is charged; when the GIS equipment electrified display device loses the control power supply, a forced locking signal is also output to keep the locking state.
Furthermore, the GIS equipment live display device has a self-checking function, can automatically detect or manually detect the working states of the sensor and each functional circuit, sends out a prompt signal when each functional circuit and the sensor have any faults, outputs a forced locking signal and keeps the locking state.
When the device detects that the corresponding GIS equipment is electrified, the indicator lamp on the panel of the device is on, the buzzer sounds, the grounding switch blade is not allowed to be connected, and the grounding switch blade can be connected only when the equipment is not electrified, so that the vicious misoperation behavior of mistakenly connecting the grounding switch blade in an electrified way can be reliably avoided.
Error prevention condition comparison before and after installation of the project is as follows:
the device electrified display device in the technical scheme comprises a sensor, a signal shielding wire, an input protection circuit, a self-checking circuit, a signal processing circuit, a display circuit, a control circuit, a locking circuit, a switching power supply and the like.
When equipment is electrified, the corresponding indicating lamp of each phase is high and flashing through control circuit control, and the buzzer sounds, no three-phase, two-phase or any one-phase electrified buzzer sounds, the alarm prompting equipment is electrified, when the equipment is not electrified, the corresponding indicating lamp of each phase is turned off, and the buzzer does not sound.
The equipment electrification display device in the technical scheme adopts split-phase control, and a forced blocking signal is output when any phase is electrified.
When the device loses the control power supply, the device also outputs a forced locking signal to keep a locking state.
In addition, the device also has a self-checking function, can automatically or manually detect the sensor and each functional circuit, sends out a prompt signal when any fault occurs in the device and the sensor, and outputs a forced locking signal to keep a locking state.
The prompt messages of the indicator light and the buzzer on the panel of the device are as follows:
indicator light and buzzer prompt information table on panel of watch-device
The device can be matched with error-proof devices such as an electromagnetic lock, a mechanical program lock, a microcomputer lock and the like to implement forced locking, and two pairs of normally open contacts are provided.
The second table is a system, device and locking contact state table:
watch two system, device and locking contact state table
| System state | Device status | Operating lamp | Contact state |
| Three-phase line all being electrified | Is normal | Extinguishment of | Disconnect |
| A phase line live line | Is normal | Extinguishment of | Disconnect |
| B phase line live line | Is normal | Extinguishment of | Disconnect |
| C-phase circuit live | Is normal | Extinguishment of | Disconnect |
| A. B phase line live line | Is normal | Extinguishment of | Disconnect |
| B. C-phase circuit live | Is normal | Extinguishment of | Disconnect |
| A. C-phase circuit live | Is normal | Extinguishment of | Disconnect |
| Three-phase line all being electrified | Failure of phase A | Extinguishment of | Disconnect |
| Three-phase line all being electrified | Failure of phase B | Extinguishment of | Disconnect |
| Three-phase line all being electrified | Failure of C phase | Extinguishment of | Disconnect |
| Three-phase line all being electrified | A. Failure of phase B | Extinguishment of | Disconnect |
| Three-phase line all being electrified | B. Failure of C phase | Extinguishment of | Disconnect |
| Three-phase line all being electrified | A. Failure of C phase | Extinguishment of | Disconnect |
| Three-phase line all being electrified | Non-control power supply | Extinguishment of | Disconnect |
| Three-phase line is not electrified | Is normal | Bright Light (LIGHT) | Closure is provided |
According to the technical scheme, an induction device is installed outside the GIS equipment by utilizing the principle of electric field coupling, and the running state of the GIS equipment is monitored in real time from the outside; the device has the advantages that the normal operation of the existing GIS equipment is not influenced, the power failure is not needed, or the barrel of the equipment is not required to be disassembled for installation, maintenance and overhaul, the device also has the function of locking the grounding switch blade of the GIS equipment, the defect that the five-prevention locking of the existing old GIS equipment is incomplete is overcome, and the operation reliability of a power system is improved.
The invention can be widely applied to the field of operation monitoring and five-prevention interlocking control of GIS equipment.
Claims (10)
1. A GIS equipment live display device is characterized in that:
the GIS equipment live display device comprises a sensor, a signal shielding wire, an input protection circuit, a self-checking circuit, a signal processing circuit, a display circuit, a control circuit, a locking circuit and a switching power supply;
the sensor monitors the running state of the equipment in real time by utilizing the principle of electric field coupling;
the signal shielding wire is used for transmitting a detection signal of the sensor;
the input protection circuit is used for limiting the amplitude of the received sensor monitoring signal and preventing the signal processing circuit and subsequent circuits from being damaged due to the fact that the sensor monitoring signal exceeds an allowable range;
the self-checking circuit is used for self-checking the input protection circuit, the signal processing circuit, the display circuit, the control circuit and the locking circuit to ensure that the working state of the input protection circuit is normal;
the signal processing circuit is used for converting the received sensor monitoring signal to make the received sensor monitoring signal meet the input requirement of the control circuit;
the control circuit is used for carrying out logic comparison and logic judgment according to the converted sensor monitoring signals, outputting a logic comparison result of whether the GIS equipment is electrified or not, and sending the logic comparison result to the display circuit for display;
the display circuit is used for displaying a logic comparison result and an alarm signal of whether the GIS equipment is electrified on a switch site;
the locking circuit is used for checking whether the logic state of the monitored GIS equipment is normal according to the five-prevention logic of the transformer substation;
the switching power supply provides power for the whole device.
2. The GIS equipment live display device according to claim 1, wherein the GIS equipment live display device adopts a non-contact electric field coupling mode to respectively monitor each phase of the GIS equipment, and simultaneously has a function of locking a grounding knife switch of the corresponding GIS equipment so as to make up for the defect of incomplete locking of five-prevention of old GIS equipment.
3. The GIS equipment electrification display device according to claim 1, wherein the sensor is installed outside the GIS equipment, and maintenance and installation can be performed without powering off and opening the equipment barrel, so that the workload of installation, maintenance or repair can be reduced, and the reliability of operation of a power system can be increased.
4. The GIS equipment live display device according to claim 1, wherein the sensor is installed outside the housing at the connection of the GIS equipment and the cable inlet/outlet, the rest circuit parts are all installed in the box body of the stainless steel metal housing, and the box body of the stainless steel metal housing is arranged on the vertical bracket installed on the GIS equipment base, so that the effective isolation of strong current and weak current is realized.
5. The GIS equipment live display device according to claim 1, wherein the connection lines between the circuit parts of the GIS equipment live display device are arranged in a box body of a metal shell, and a power supply line, a signal shielding line and an output locking contact are externally connected through terminals so as to enhance the overall anti-interference capability of the device.
6. The GIS equipment live display device according to claim 1, wherein the GIS equipment live display device provides two pairs of normally open contacts, and the two pairs of normally open contacts are matched with an electromagnetic lock, a mechanical program lock or a microcomputer locking anti-misoperation device to realize a logic function of forced locking.
7. The GIS equipment electrification display device according to claim 1, wherein when the corresponding GIS equipment is electrified, the control circuit controls the corresponding indicator lamp of each phase to flash and the buzzer to sound; no matter three-phase, two-phase or any phase has the electric buzzer, the alarm prompting device sounds and the alarm prompting device is electrified.
8. The device for displaying the electrification of the GIS equipment according to claim 1, wherein when the corresponding GIS equipment is not electrified, the control circuit controls the corresponding indicator light of each phase to be off, and the buzzer does not sound.
9. The GIS equipment live display device according to claim 1, wherein the GIS equipment live display device adopts split-phase control, and when any phase is live, a forced blocking signal is output;
when the GIS equipment electrified display device loses the control power supply, a forced locking signal is also output to keep the locking state.
10. The GIS equipment live display device according to claim 1, wherein the GIS equipment live display device has a self-checking function, and can automatically or manually check the working state of the sensor and each functional circuit, and when any fault occurs in each functional circuit and the sensor, a prompt signal is sent out, and a forced locking signal is output to maintain the locking state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015183.XA CN113156187A (en) | 2020-01-07 | 2020-01-07 | Electrified display device of GIS equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015183.XA CN113156187A (en) | 2020-01-07 | 2020-01-07 | Electrified display device of GIS equipment |
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| CN113156187A true CN113156187A (en) | 2021-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010015183.XA Pending CN113156187A (en) | 2020-01-07 | 2020-01-07 | Electrified display device of GIS equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114594304A (en) * | 2022-03-10 | 2022-06-07 | 深圳供电局有限公司 | A power transmission locking device with ground knife or ground wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203069655U (en) * | 2013-02-02 | 2013-07-17 | 四川省电力公司西昌电业局 | Induction-type high-voltage presence indication device |
| CN204374295U (en) * | 2015-01-23 | 2015-06-03 | 江苏省电力公司常州供电公司 | A kind of induction-type high-voltage charged display device |
| CN205281213U (en) * | 2016-01-12 | 2016-06-01 | 黄绍伟 | Non -contact high voltage power distribution looped netowrk is mouthful electrified blocking device that shows cashier's office in a shop |
| CN108196135A (en) * | 2018-03-16 | 2018-06-22 | 镇江华源晋昌电器有限公司 | A kind of high direct voltage electrified display interlock apparatus |
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2020
- 2020-01-07 CN CN202010015183.XA patent/CN113156187A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203069655U (en) * | 2013-02-02 | 2013-07-17 | 四川省电力公司西昌电业局 | Induction-type high-voltage presence indication device |
| CN204374295U (en) * | 2015-01-23 | 2015-06-03 | 江苏省电力公司常州供电公司 | A kind of induction-type high-voltage charged display device |
| CN205281213U (en) * | 2016-01-12 | 2016-06-01 | 黄绍伟 | Non -contact high voltage power distribution looped netowrk is mouthful electrified blocking device that shows cashier's office in a shop |
| CN108196135A (en) * | 2018-03-16 | 2018-06-22 | 镇江华源晋昌电器有限公司 | A kind of high direct voltage electrified display interlock apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114594304A (en) * | 2022-03-10 | 2022-06-07 | 深圳供电局有限公司 | A power transmission locking device with ground knife or ground wire |
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Application publication date: 20210723 |