CN113161170B - Method for preventing electrified mis-closing of grounding switch blade on GIS combined electrical appliance - Google Patents
Method for preventing electrified mis-closing of grounding switch blade on GIS combined electrical appliance Download PDFInfo
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- CN113161170B CN113161170B CN202010015686.7A CN202010015686A CN113161170B CN 113161170 B CN113161170 B CN 113161170B CN 202010015686 A CN202010015686 A CN 202010015686A CN 113161170 B CN113161170 B CN 113161170B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005684 electric field Effects 0.000 claims abstract description 12
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 230000003211 malignant effect Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims description 13
- 238000012423 maintenance Methods 0.000 claims description 13
- 230000007547 defect Effects 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
A method for preventing a grounding knife switch from being connected with a power line by mistake on a GIS combined electrical appliance belongs to the field of safety. An electric field sensor is correspondingly arranged on the shell of the three-phase input/output line pipe of the GIS equipment, whether the monitored GIS equipment is in a charged state or not is monitored in real time by utilizing the principle of electric field coupling, and the detection and monitoring result of whether the phase GIS equipment is charged is externally output in an acoustic/optical signal mode; when the corresponding GIS equipment is detected to be electrified, the earthing switch blade is not allowed to be closed; only when the incoming line side or the outgoing line side of the GIS equipment is not electrified, the corresponding grounding switch blade can be closed, so that the malignant misoperation of the electrified mis-closing grounding switch blade is avoided. The operation state of GIS equipment is monitored in real time from the outside; the normal operation of the existing GIS equipment is not affected, the function of locking the grounding switch blade of the GIS equipment is also achieved, and the operation reliability of the power system is improved. The method can be widely applied to the fields of operation monitoring and five-prevention interlocking control of GIS equipment.
Description
Technical Field
The invention belongs to the field of safety devices, and particularly relates to a locking safety device for GIS equipment.
Background
In the operation process of the power system and the power equipment, the five-prevention function is a necessary safety measure for preventing misoperation.
In an electrical power system, the "five-guard" function typically includes:
1. The circuit breaker is prevented from being opened or closed by mistake;
2. the on-load pulling and closing of the isolating switch are prevented;
3. preventing electrification (hanging) of the ground wire (switch);
4. Preventing the combined circuit breaker (isolating switch) with the grounding wire (switch);
5. Preventing false entry into the charging interval.
In order to ensure the reliable implementation of the five-prevention function, in the electric power system, a "locking point" for preventing misoperation is usually required to be arranged in a control system of the high-voltage switch equipment so as to ensure the operation and running safety of the high-voltage equipment
The "latch point" is a latch control point capable of realizing a certain function of preventing electrical misoperation for high-voltage electrical equipment in a set of misoperation preventing (abbreviated as "misoperation preventing") devices. Such as an actuator (lock, contact) of a mechanical or electrical locking device.
The misoperation-preventing locking device is a mechanical device which is arranged on high-voltage electrical equipment to prevent misoperation by utilizing a self-established program locking function. The anti-false lockout device generally includes: microcomputer error prevention, electrical locking, electromagnetic locking, mechanical interlocking, mechanical program locking, mechanical locking, electrified display device and the like.
GIS (GAS insulated SWITCHGEAR) is the English abbreviation of the gas-insulated fully-enclosed combined electrical apparatus. The GIS consists of a breaker, a disconnecting switch, a grounding switch, a transformer, a lightning arrester, a bus, a connecting piece, an outgoing terminal and the like, all the equipment or parts are sealed in a metal grounded shell, SF6 insulating gas with certain pressure is filled in the equipment or parts, and the equipment or the parts are also called SF6 totally-enclosed combined electrical apparatus.
The grounding disconnecting link of the existing partial old GIS equipment has no reliable misoperation-preventive locking device, not only does not meet the relevant regulations of the relevant safety operation regulations, but also brings about small potential safety hazards to the operation and work.
The GIS equipment in most of running at present is provided with the electrified display device, but the electrified display device is arranged in the equipment cylinder, and the equipment cylinder is required to be opened by power failure in the installation and daily maintenance processes, so that the workload is huge, and meanwhile, the stable running of a power system is influenced.
How to guarantee that the grounding disconnecting link can realize reliable misoperation-preventive locking on GIS equipment without an misoperation-preventive locking device, and the installation, the use or the maintenance of the misoperation-preventive locking device do not need to disassemble a barrel of the equipment, so that the normal operation of the existing GIS equipment is not influenced, the safe and stable operation of a power system is ensured, the misoperation phenomenon is prevented, the technical requirement of five-prevention of the power system is met, and the misoperation-preventive locking device is an important problem to be solved in field practical work.
Disclosure of Invention
The invention aims to provide a method for preventing a grounding knife from being switched on by mistake in a charged way on a GIS combined electrical appliance. The method utilizes the principle of electric field coupling, an induction device is arranged outside GIS equipment, and the running state of the GIS equipment is monitored from outside in real time; the normal operation of the existing GIS equipment is not affected, the installation or maintenance and overhaul of the cylinder of the equipment are not required to be performed during power failure or disassembly, the function of locking the grounding switch blade of the GIS equipment is also provided, the defect of imperfect five-prevention locking of the existing old GIS equipment is overcome, and the operation reliability of the electric power system is also improved.
The technical scheme of the invention is as follows: the method for preventing the electrified misoperation of the grounding knife switch on the GIS combined electrical appliance comprises the steps of establishing a logic interlocking relationship between the GIS combined electrical appliance and the grounding knife switch, and is characterized in that:
1) An electric field sensor is correspondingly arranged on a three-phase inlet/outlet pipe shell of the GIS equipment respectively, whether the monitored GIS equipment is in a charged state or not is monitored in real time by utilizing the principle of electric field coupling, and the detection and monitoring result of whether the phase GIS equipment is charged is output outwards in an acoustic/optical signal mode;
2) Comparing the on and off states of the three-phase switch of the monitored GIS equipment with the five-prevention rule of the power system, and determining the allowable operation items or operation contents in the current equipment state;
3) By monitoring whether three phases of GIS equipment are electrified or not, according to the five-prevention rule of the power system, corresponding operation locking is carried out on a grounding disconnecting link of the monitored GIS equipment, so that the operation against the five-prevention rule is prevented from being executed erroneously;
5) When the corresponding GIS equipment is detected to be electrified, the earthing switch blade is not allowed to be closed; only when the incoming line side or the outgoing line side of the GIS equipment is not electrified, the corresponding grounding switch blade can be closed so as to prevent the malignant misoperation of the electrified mis-closing grounding switch blade;
6) And outputting an alarm when detecting that the running state of the corresponding related switch or the grounding disconnecting link is inconsistent with the on/off state of the corresponding related switch or the grounding disconnecting link.
Specifically, whether the grounding knife switch on the line side of the equipment is allowed to be closed is determined according to whether the corresponding GIS equipment is electrified, so that a logic interlocking relationship is established between the running state of the GIS equipment and the grounding knife switch on the line side of the GIS equipment, and the error locking prevention function is realized.
Furthermore, through the structural mode of a sensor which is correspondingly arranged on the three-phase inlet/outlet pipe shell of the GIS equipment, the misoperation-preventive locking function is realized between the GIS equipment and the grounding switch blade at the line side of the GIS equipment, so that the defect of imperfect five-prevention locking of the GIS equipment is overcome.
According to the technical scheme, the sensor is correspondingly arranged on the three-phase inlet/outlet pipe shell of the GIS equipment, the installation and the maintenance can be carried out without opening the equipment cylinder body in a power failure, the workload of installation, maintenance or repair can be reduced, and the operation reliability of the power system is improved.
Specifically, when the corresponding GIS equipment is electrified, the corresponding indication lamp of each phase is high in brightness, and the buzzer sounds; the electric buzzer sounds no matter three-phase, two-phase or any one phase, and the alarm prompt equipment has electricity.
Specifically, when the corresponding GIS equipment is not electrified, the corresponding indicator lights of each phase are turned off, and the buzzer does not sound.
Further, the method for preventing the ground knife from being connected with the GIS by mistake is to adopt split-phase control, and the forced locking signal of the ground knife switch is output when any phase is electrified, so that the locking state is maintained.
Further, the method for preventing the grounding knife from being connected with the GIS by mistake on the GIS combined electrical appliance is characterized in that for the GIS equipment without the misoperation preventing device, a sensor is correspondingly arranged on the three-phase inlet/outlet pipe shell of the GIS equipment to detect whether the corresponding equipment is electrified or not, so that the grounding knife gate of the GIS equipment without the misoperation preventing device can realize reliable misoperation preventing, and the installation, the use or the maintenance of the misoperation preventing device does not need to disassemble a barrel of the equipment, and the normal operation of the existing GIS equipment is not influenced, thereby ensuring the safe and stable operation of a power system and preventing the misoperation phenomenon.
Compared with the prior art, the invention has the advantages that:
1. The non-contact electric field coupling mode is adopted, and the running state of the equipment is monitored in real time; whether the GIS equipment is electrified or not can be intuitively monitored and displayed, and whether the grounding device (namely the grounding disconnecting link) of the GIS equipment is allowed to be put into logic interlocking or not can be judged according to the five-prevention rule;
2. The sensor and the related control circuit part are all arranged outside the GIS equipment, maintenance and installation can be carried out without opening the equipment cylinder body in a power failure, the workload of installation, maintenance or repair can be reduced, and the operation reliability of the power system is improved;
3. The control circuit part provides two pairs of normally open contacts, can be conveniently matched with an electromagnetic lock, a mechanical program lock or a microcomputer locking error prevention device, and realizes the logic function of forced locking;
4. The control circuit part has a self-checking function, can automatically or manually detect the working states of the sensor and each functional circuit, sends out prompt signals when any fault occurs in each functional circuit and the sensor, outputs forced locking signals and keeps the locking state.
5. The phase separation control is adopted, and a forced locking signal is output when any phase is electrified; when the device loses control power, a forced locking signal is output as well, and the locking state is kept.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
In fig. 1, the technical scheme of the present invention provides a method for preventing a ground knife from being connected with a GIS combined electrical apparatus by mistake, which includes establishing a logic interlocking relationship between the GIS combined electrical apparatus and the ground knife thereof, and the invention is that:
1) An electric field sensor is correspondingly arranged on a three-phase inlet/outlet pipe shell of the GIS equipment respectively, whether the monitored GIS equipment is in a charged state or not is monitored in real time by utilizing the principle of electric field coupling, and the detection and monitoring result of whether the phase GIS equipment is charged is output outwards in an acoustic/optical signal mode;
2) Comparing the on and off states of the three-phase switch of the monitored GIS equipment with the five-prevention rule of the power system, and determining the allowable operation items or operation contents in the current equipment state;
3) By monitoring whether three phases of GIS equipment are electrified or not, according to the five-prevention rule of the power system, corresponding operation locking is carried out on a grounding disconnecting link of the monitored GIS equipment, so that the operation against the five-prevention rule is prevented from being executed erroneously;
5) When the corresponding GIS equipment is detected to be electrified, the earthing switch blade is not allowed to be closed; only when the incoming line side or the outgoing line side of the GIS equipment is not electrified, the corresponding grounding switch blade can be closed so as to prevent the malignant misoperation of the electrified mis-closing grounding switch blade;
6) And outputting an alarm when detecting that the running state of the corresponding related switch or the grounding disconnecting link is inconsistent with the on/off state of the corresponding related switch or the grounding disconnecting link.
Specifically, whether the grounding knife switch on the line side of the equipment is allowed to be closed is determined according to whether the corresponding GIS equipment is electrified, so that a logic interlocking relationship is established between the running state of the GIS equipment and the grounding knife switch on the line side of the GIS equipment, and the error locking prevention function is realized.
Furthermore, by arranging the structural mode of a sensor on the three-phase inlet/outlet pipe shell corresponding to the GIS equipment, the anti-misoperation locking function is realized between the GIS equipment and the grounding switch blade at the line side of the GIS equipment, so that the defect of imperfect five-prevention locking of the GIS equipment is overcome.
According to the technical scheme, the three-phase inlet/outlet pipe shell of each GIS equipment is correspondingly provided with the structural mode of one sensor, installation and maintenance can be carried out without opening the equipment cylinder body in a power failure mode, the workload of installation, maintenance or repair can be reduced, and the operation reliability of the power system is improved.
Specifically, when the corresponding GIS equipment is electrified, the corresponding indication lamp of each phase is high in brightness, and the buzzer sounds; the electric buzzer sounds no matter three-phase, two-phase or any one phase, and the alarm prompt equipment has electricity.
Specifically, when the corresponding GIS equipment is not electrified, the corresponding indicator lights of each phase are turned off, and the buzzer does not sound.
According to the method for preventing the ground knife from being connected with the GIS by mistake in an electrified manner, split-phase control is adopted, and a forced locking signal of the ground knife is output when any phase is electrified, so that a locking state is maintained.
According to the method for preventing the grounding knife from being connected with the ground by mistake on the GIS combined electrical appliance, for the GIS equipment without the misoperation preventing device, the monitoring mode that whether the corresponding equipment is electrified or not is detected by correspondingly arranging the sensors on the three-phase inlet/outlet pipe shell of the GIS equipment, so that the grounding knife of the GIS equipment without the misoperation preventing device can be reliably locked by mistake, and the installation, the use or the maintenance of the misoperation preventing device is realized, the barrel of the equipment is not required to be disassembled, the normal operation of the existing GIS equipment is not influenced, the safe and stable operation of a power system is ensured, and the misoperation phenomenon is prevented.
When the technical scheme is adopted to detect that the corresponding GIS equipment is electrified, the indicator lamp on the panel of the device is lighted, the buzzer sounds, the grounding switch blade is not allowed to be closed, and the grounding switch blade can be closed only when the equipment is not electrified, so that the malignant misoperation of the grounding switch blade can be reliably stopped.
Error-proof condition comparison and explanation before and after implementation of the project:
in the technical scheme, the 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, a switching power supply and the like.
When GIS equipment is electrified, the corresponding each phase indicator lamp is controlled to be high and shiny through the control circuit, the buzzer sounds, no any three-phase, two-phase or any phase of electrified buzzer sounds, the alarm prompting equipment is electrified, and when the equipment is not electrified, the corresponding each phase indicator lamp is off, and the buzzer does not sound.
The equipment electrification display device in the technical scheme adopts split-phase control, and a forced locking signal is output when any phase is electrified.
When the device loses control power, 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 between the device and the sensor, outputs a forced locking signal and keeps the locking state.
The indicator light and buzzer prompt information on the device panel are shown in the following table:
Indicator light and buzzer prompt information table on surface plate of meter
| Device status | A-phase indicating lamp | B-phase indicator lamp | C-phase indicator lamp | Power source lamp | Operating lamp | Buzzer |
| Three-phase powered | High flash | High flash | High flash | Normally bright | Extinguishing device | Sounding method |
| Phase A electroless | Extinguishing device | High flash | High flash | Normally bright | Extinguishing device | Sounding method |
| Phase B electroless | High flash | Extinguishing device | High flash | Normally bright | Extinguishing device | Sounding method |
| Phase C electroless | High flash | High flash | Extinguishing device | Normally bright | Extinguishing device | Sounding method |
| A. phase B electroless | Extinguishing device | Extinguishing device | High flash | Normally bright | Extinguishing device | Sounding method |
| A. Phase C electroless | Extinguishing device | High flash | Extinguishing device | Normally bright | Extinguishing device | Sounding method |
| B. Phase C electroless | High flash | Extinguishing device | Extinguishing device | Normally bright | Extinguishing device | Sounding method |
| Three-phase electroless power | Extinguishing device | Extinguishing device | Extinguishing device | Normally bright | Normally bright | Sounding-free |
| A phase sensor failure | Dark and shiny | High flash | High flash | Flashing light | Extinguishing device | Sounding method |
| B-phase sensor failure | High flash | Dark and shiny | High flash | Flashing light | Extinguishing device | Sounding method |
| C-phase sensor failure | High flash | High flash | Dark and shiny | Flashing light | Extinguishing device | Sounding method |
| A. B-phase sensor failure | Dark and shiny | Dark and shiny | High flash | Flashing light | Extinguishing device | Sounding method |
| A. C-phase sensor failure | Dark and shiny | High flash | Dark and shiny | Flashing light | Extinguishing device | Sounding method |
| B. C-phase sensor failure | High flash | Dark and shiny | Dark and shiny | Flashing light | Extinguishing device | Sounding method |
| Three-phase sensor failure | Dark and shiny | Dark and shiny | Dark and shiny | Flashing light | Extinguishing device | Sounding method |
The device can realize the forced locking by matching with an electromagnetic lock, a mechanical program lock, a microcomputer locking device and other error-preventing devices, and provides two pairs of normally open contacts.
The second table is a system, device and lock contact state table:
meter two system, device and locking contact state meter
According to the technical scheme, the induction device is arranged outside the GIS equipment by utilizing the principle of electric field coupling, and the running state of the GIS equipment is monitored from outside in real time; the normal operation of the existing GIS equipment is not affected, the installation or maintenance and overhaul of the cylinder of the equipment are not required to be performed during power failure or disassembly, the function of locking the grounding switch blade of the GIS equipment is also provided, the defect of imperfect five-prevention locking of the existing old GIS equipment is overcome, and the operation reliability of the electric power system is also improved.
The invention can be widely applied to the fields of operation monitoring and five-prevention interlocking control of GIS equipment.
Claims (1)
1. A method for preventing a grounding knife switch from being connected with a power line by mistake on a GIS combined electrical appliance comprises the steps of establishing a logic interlocking relationship between the GIS combined electrical appliance and the grounding knife switch, and is characterized in that:
1) Aiming at GIS equipment without an error locking device, an electric field sensor is correspondingly arranged on each of three-phase wire inlet pipe and wire outlet pipe shells of the GIS equipment, whether the monitored GIS equipment is in a charged state is monitored in real time by utilizing the principle of electric field coupling, and the detection and monitoring result of whether the corresponding phase GIS equipment is charged is output outwards in a mode of acoustic signals or optical signals;
2) Comparing the on and off states of the three-phase switch of the monitored GIS equipment with the five-prevention rule of the power system, and determining the allowable operation items or operation contents in the current equipment state;
3) By monitoring whether three phases of GIS equipment are electrified or not, according to the five-prevention rule of the power system, corresponding operation locking is carried out on a grounding disconnecting link of the monitored GIS equipment, so that the operation against the five-prevention rule is prevented from being executed erroneously;
4) When the corresponding GIS equipment is detected to be electrified, the earthing switch blade is not allowed to be closed; only when the incoming line side or the outgoing line side of the GIS equipment is not electrified, the corresponding grounding switch blade can be closed so as to prevent the malignant misoperation of the electrified mis-closing grounding switch blade;
5) When detecting that the running state of the corresponding related switch or the grounding disconnecting link is inconsistent with the on state or the off state of the corresponding related switch or the grounding disconnecting link, outputting an alarm;
Specifically, when the corresponding GIS equipment is electrified, the corresponding indicator lamp is high in brightness, and the buzzer sounds; whether three phases, two phases or any one phase is electrified, the buzzer sounds, and the alarm prompt equipment is electrified;
when the GIS equipment is not electrified, each phase of indicator light goes out, and the buzzer does not sound;
The method for preventing the ground knife switch from being connected with the GIS combined electrical appliance by mistake is characterized in that split-phase control is adopted, a forced locking signal of the ground knife switch is output when any phase is electrified, and a locking state is kept;
according to the method for preventing the grounding knife switch from being connected with the GIS by mistake, an induction device is arranged outside the GIS by utilizing the principle of electric field coupling, the running state of the GIS is monitored in real time from the outside, and the grounding knife switch of the GIS without the misoperation-preventive locking device can realize reliable misoperation-preventive locking; the normal operation of the existing GIS equipment is not affected, the installation or maintenance and overhaul of the cylinder of the equipment are not required to be performed during power failure or disassembly, the function of locking the grounding switch blade of the GIS equipment is also provided, the defect of imperfect five-prevention locking of the old GIS equipment is overcome, and the operation reliability of the power system is improved.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015686.7A CN113161170B (en) | 2020-01-07 | 2020-01-07 | Method for preventing electrified mis-closing of grounding switch blade on GIS combined electrical appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010015686.7A CN113161170B (en) | 2020-01-07 | 2020-01-07 | Method for preventing electrified mis-closing of grounding switch blade on GIS combined electrical appliance |
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| CN113161170A CN113161170A (en) | 2021-07-23 |
| CN113161170B true CN113161170B (en) | 2024-06-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5834909A (en) * | 1995-07-12 | 1998-11-10 | Gec Alsthom T & D Sa | Device for actuating electrical equipment, in particular a high-voltage section switch or a high-voltage grounding section switch |
| CN102064489A (en) * | 2009-11-18 | 2011-05-18 | 维依埃龙源电工研究院有限公司 | High-voltage gas-insulated and metal-enclosed switching equipment |
| CN102684310A (en) * | 2012-06-04 | 2012-09-19 | 浙江开关厂有限公司 | Gas insulated switchgear (GIS) microprocessor control system |
| CN202649796U (en) * | 2012-06-08 | 2013-01-02 | 商河县供电公司 | A line safety monitor blocking device |
| CN104362520A (en) * | 2014-10-23 | 2015-02-18 | 国家电网公司 | Intelligent high voltage verification display and block system of substation |
-
2020
- 2020-01-07 CN CN202010015686.7A patent/CN113161170B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5834909A (en) * | 1995-07-12 | 1998-11-10 | Gec Alsthom T & D Sa | Device for actuating electrical equipment, in particular a high-voltage section switch or a high-voltage grounding section switch |
| CN102064489A (en) * | 2009-11-18 | 2011-05-18 | 维依埃龙源电工研究院有限公司 | High-voltage gas-insulated and metal-enclosed switching equipment |
| CN102684310A (en) * | 2012-06-04 | 2012-09-19 | 浙江开关厂有限公司 | Gas insulated switchgear (GIS) microprocessor control system |
| CN202649796U (en) * | 2012-06-08 | 2013-01-02 | 商河县供电公司 | A line safety monitor blocking device |
| CN104362520A (en) * | 2014-10-23 | 2015-02-18 | 国家电网公司 | Intelligent high voltage verification display and block system of substation |
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| CN113161170A (en) | 2021-07-23 |
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