CN105572517B - A kind of arrester on-line monitoring Intelligent live access protective device and control method - Google Patents

A kind of arrester on-line monitoring Intelligent live access protective device and control method Download PDF

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Publication number
CN105572517B
CN105572517B CN201610104869.XA CN201610104869A CN105572517B CN 105572517 B CN105572517 B CN 105572517B CN 201610104869 A CN201610104869 A CN 201610104869A CN 105572517 B CN105572517 B CN 105572517B
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China
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unit
voltage
arrester
current
embedded
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CN105572517A (en
Inventor
王帅
吴湘黔
李琼
詹乐贵
陈潇瑞
黄力
杨华
雷龙武
余名军
曹立波
黄永冰
林丽燕
刘佳
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Tongren Power Supply Bureau of Guizhou Power Grid Co Ltd
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Tongren Power Supply Bureau of Guizhou Power Grid Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The present invention relates to a kind of arrester on-line monitoring Intelligent live access protective device and control methods, and the device is including a cabinet and is embedded at the intracorporal detection circuit of the case;Detection circuit includes MCU control unit, electrical energy measurement unit, numeral method unit, power supply unit, signal lamp unit, buzzer, operation amplifier unit, difference amplifier unit, Current Mutual Inductance unit, current measuring unit and and voltage measurement unit.This method comprises: equipment access personnel monitor in meter connection line by the way that the device is accessed arrester, detect voltage, electric current, and combine the response of indicator light and buzzer judge temporary ground wire whether reliable ground.Whether the present invention can intuitively, reliably judge ground line reliable ground, and whether personnel are accessed by temporary ground wire reliable ground by function prompts equipment such as numeral method earth current, voltage and buzzer warnings, hidden danger is eliminated, the safety coefficient of production is improved.

Description

A kind of arrester on-line monitoring Intelligent live access protective device and control method
Technical field
The present invention relates to a kind of arrester on-line monitoring Intelligent live access protective device and control methods.
Background technique
When conventional oxidation zinc arrester on-Line Monitor Device accesses, core-theaded type mutual inductor is needed to seal in ground line, it should Mutual inductor is usually mounted in the connecting line of the top of Zinc-Oxide Arrester monitoring meter.It is first interim with one when site operation Ground line is over the ground shorting out the top of monitoring meter, then unlocks the connecting line above monitoring meter, seals in monitoring device In core-theaded type mutual inductor, monitoring meter is finally taken back again, restores field connection.Zinc-Oxide Arrester on-Line Monitor Device is usually Band is electrically accessed, to guarantee that equipment accesses the personal safety of personnel, it is necessary to assure temporary ground wire reliably accesses.Common temporarily connects Ground wire can not judge whether reliable ground after having connect, and there are some potential safety problemss.
Summary of the invention
The purpose of the present invention is to provide a kind of arrester on-line monitoring Intelligent lives to access protective device and control method, To overcome defect existing in the prior art.
To achieve the above object, the technical scheme is that a kind of on-line monitoring Intelligent live access protection of arrester Device, including a cabinet and it is embedded at the intracorporal detection circuit of the case;The detection circuit includes a MCU control unit, leads to Cross electrical energy measurement unit that spi bus is connected with the MCU control unit, the charactron that is connected with the MCU control unit it is aobvious Show unit, the power supply unit being connected with the MCU control unit, the signal lamp unit being connected with the MCU control unit, The buzzer being connected with the MCU control unit, the operation amplifier unit and the electric energy that are connected with the electrical energy measurement unit It is the connected difference amplifier unit of metering units, the Current Mutual Inductance unit being connected with the operation amplifier unit, mutual with the electric current Voltage measurement unit sensor connected current measuring unit and be connected with the difference amplifier unit.
In an embodiment of the present invention, the MCU control unit includes a STM32 single-chip microcontroller.
In an embodiment of the present invention, the electrical energy measurement unit includes an IDT90E36.
In an embodiment of the present invention, the operation amplifier unit includes an OPA2277, and the difference amplifier unit includes One AMP03GS.
In an embodiment of the present invention, the power supply unit includes a 12V rechargeable lithium battery.
In an embodiment of the present invention, the cabinet include a buckle closure and with the matched pedestal of the buckle closure, the buckle closure Pass through a pair of of lock body with the pedestal to lock, the detection circuit is embedded in the pedestal;The pedestal includes a bottom plate, one Top plate and side plate;The top plate offer for be embedded the first through hole of voltage display screen in the numeral method unit, For being embedded the second through-hole of electric current display screen in the numeral method unit, for being embedded in the signal lamp unit The third through-hole of power supply indicator is used to indicate the ground signalling of reliable ground and refers to for being embedded in the signal lamp unit Show the fourth hole of lamp, for being embedded the fifth hole of alarm indicator in the signal lamp unit, it is described for being embedded 6th through-hole of line under-voltage indicator light, for being embedded power switch in the power supply unit the 7th in signal lamp unit Through-hole, the 8th through-hole for being embedded charging interface in the power supply unit, for being embedded first in the voltage measurement unit 9th through-hole of voltage link column, is used for the tenth through-hole for being embedded second voltage binding post in the voltage measurement unit It is embedded the 11st through-hole of the first electric current binding post in the current measuring unit, for being embedded in the current measuring unit 12nd through-hole of two electric current binding posts.
Further, a kind of control method of arrester on-line monitoring Intelligent live access protective device is also provided, is provided One arrester monitors meter, and arrester monitoring meter one end is connected with arrester, and other end ground connection includes the following steps:
Step S1: opening the power switch of power supply unit, makes arrester on-line monitoring Intelligent live access protective device It powers on, the voltage display screen in numeral method unit shows the voltage of lithium battery in the power supply unit, and signal lamp Alarm indicator is bright in unit;If the voltage of the lithium battery is within the scope of the first supply voltage, in signal lamp unit Power supply indicator is bright, and otherwise, described to state battery undervoltage indicator light in signal lamp unit bright;
Step S2: the first voltage connecting terminal being connected with first voltage binding post in voltage measurement unit is connected to institute It states between arrester monitoring meter and arrester, by the be connected with second voltage binding post in the voltage measurement unit second electricity Crimping line terminals are connected to the ground, and check voltage that the voltage display screen is shown whether within the scope of detection voltage threshold, if It is then to go to step S3, otherwise, goes to step S5;
Step S3: institute will be connected to the first current wiring terminal that the first electric current binding post is connected in current measuring unit State between arrester monitoring meter and arrester, by with that the second electric current binding post is connected in the current measuring unit is second electric Whether the electric current that the electric current display screen that stream connecting terminal is connected to the ground, and checks in numeral method unit is shown is in detection electric current In threshold range, if so, going to step S4, otherwise, step S5 is gone to;
Step S4: judge electric current measured by voltage that the voltage display screen is shown and arrester monitoring meter It whether is 0, if so, buzzer is continuous and constant duration responds, the ground signalling indicator light in signal lamp unit is bright, The alarm indicator goes out, and prompts equipment access personnel's temporary ground wire reliable ground;Otherwise, step S5 is gone to;
Step S5: the alarm indicator is bright, and the buzzer is not responding to, and equipment is prompted to access personnel's temporary ground wire There is no reliable ground.
In an embodiment of the present invention, the first supply voltage range is 10.8V ~ 20V;The detection voltage threshold model It encloses are as follows: 0V ~ 36V;The detection current threshold range is 0 mA ~ 5mA.
In an embodiment of the present invention, current signal collected is carried out two channel amplifications by the operation amplifier unit, And the low current by current range in 90uA ~ 500uA amplifies 20 times, by current range at 2 times of Current amplifier of 500uA ~ 5mA.
In an embodiment of the present invention, the MCU control unit is when calculating voltage value or current value, by repeatedly reading Current measurement value and voltage measuring value, and remove the method being averaged after maximum value and minimum value.
Compared to the prior art, the invention has the following advantages:
(1) current measurement uses core-theaded type mutual inductor, and electric current is acquired using dedicated metering chip, stablizes, is reliable;
(2) voltage measurement circuit uses high-impedance differential circuit, does not have influence substantially to the impedance in former circuit;
(3) using highlighted numeral method electric current, voltage, operation interface is beautiful, human nature is intelligent;
(4) field personnel is provided in such a way that buzzer difference pipes, whether simple zones code insurance protection unit Reliable ground;
(5) device uses built-in high-capacity lithium battery, and the effective time is long after normally filling primary electricity.
(6) whether arrester Intelligent live access protective device can intuitively, reliably judge ground line reliable ground, and Access whether personnel will temporarily connect by the function prompts equipment such as numeral method earth current, voltage and buzzer warning Ground wire reliable ground, eliminates hidden danger, improves the safety coefficient of production.
(7) since current measuring range is bigger, in order to preferably measure low current signal, and guarantee amplified big electricity Signal is flowed without departing from Chip Microcomputer A/D acquisition range, and the amplification of two channels has been carried out to current signal in circuit design, range is existed The low current of 90uA ~ 500uA amplifies 20 times, by range at 2 times of Current amplifier of 500uA ~ 5mA.
(8) it is the accuracy for guaranteeing electric current and voltage measuring value, reduces data fluctuations caused by external interference, program is being surveyed Using electric current and voltage measuring value is repeatedly read when amount, remove the method being averaging after maximin.
Detailed description of the invention
Fig. 1 is the circuit diagram that arrester of the present invention monitors that Intelligent live accesses detection circuit in protective device on-line.
Fig. 2 is the main view that arrester of the present invention monitors that Intelligent live accesses cabinet in protective device on-line.
Fig. 3 is the structural representation that arrester of the present invention monitors that Intelligent live accesses top plate in protective device raising middle flask body on-line Figure.
Fig. 4 is the schematic diagram that arrester of the present invention monitors that Intelligent live accesses the access equipment under test of protective device on-line.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
The present invention provides a kind of arrester on-line monitoring Intelligent live access protective device, including a cabinet and is embedded at The intracorporal detection circuit of the case;As shown in Figure 1, the detection circuit include a MCU control unit, by spi bus with it is described The connected electrical energy measurement unit of MCU control unit, the numeral method unit being connected with the MCU control unit and the MCU The connected power supply unit of control unit, the signal lamp unit being connected with the MCU control unit control list with the MCU The connected buzzer of member, is connected at the operation amplifier unit that is connected with the electrical energy measurement unit with the electrical energy measurement unit Difference amplifier unit, the Current Mutual Inductance unit being connected with the operation amplifier unit, the electric current being connected with the current transformer Measuring unit and the voltage measurement unit being connected with the difference amplifier unit.
Further, in the present embodiment, the MCU control unit includes a STM32 single-chip microcontroller.
Further, in the present embodiment, the electrical energy measurement unit includes an IDT90E36.
Further, in the present embodiment, the operation amplifier unit includes an OPA2277, the difference amplifier unit Including an AMP03GS.
Further, in the present embodiment, the power supply unit includes a 12V rechargeable lithium battery.
Further, in the present embodiment, as shown in FIG. 2 and 3, the cabinet include a buckle closure 1 and with the button Matched pedestal 2 is covered, the buckle closure and the pedestal pass through a pair of of lock body 3 and lock, and the detection circuit is embedded at the pedestal 2 It is interior;The pedestal includes a bottom plate, a top plate 4 and side plate;The top plate 4 is offered for being embedded the numeral method list The first through hole of voltage display screen 5 in member, for be embedded the second through-hole of electric current display screen 6 in the numeral method unit, For being embedded the third through-hole of power supply indicator 7 in the signal lamp unit, for being embedded the signal lamp unit In be used to indicate reliable ground ground signalling indicator light 8 fourth hole, accuse for being embedded in the signal lamp unit Warn the fifth hole of indicator light 9, for being embedded the 6th through-hole of line under-voltage indicator light 10 in the signal lamp unit, using In be embedded power switch 11 in the power supply unit the 7th through-hole, for being embedded charging interface 12 in the power supply unit Eight through-holes, the 9th through-hole for being embedded first voltage binding post 13 in the voltage measurement unit, for being embedded the voltage Tenth through-hole of second voltage binding post 14 in measuring unit, for being embedded the first electric current binding post in the current measuring unit 15 the 11st through-hole, the 12nd through-hole for being embedded the second electric current binding post 16 in the current measuring unit.
Further, in the present embodiment, entire detection device is powered using battery, and external there are four connectors, is respectively as follows: Voltage ﹢, voltage ﹣, electric current ﹢, electric current ﹣.There are two group of four figures display tubes on panel, show temporary ground wire both end voltage respectively It is worth and flows through the current value of temporary ground wire;One " power supply instruction " lamp;One " reliable ground instruction " lamp;One " alarm Lamp ";One " line under-voltage " lamp;One power switch;One charge port.
Further, in the present embodiment, a kind of arrester on-line monitoring Intelligent live access protective device is also provided Control method provides arrester monitoring meter 17, and arrester monitoring meter one end is connected with arrester 18, another termination Ground includes the following steps: in Fig. 4 shown in (a)
Step S1: opening the power switch of power supply unit, makes arrester on-line monitoring Intelligent live access protective device It powers on, the charactron on voltage display screen in numeral method unit can flash the electricity for showing lithium battery in the power supply unit Pressure, the display time is 5s, and alarm indicator is bright in signal lamp unit;If the voltage of the lithium battery is in the first power supply electricity It presses in range, then power supply indicator is bright in signal lamp unit, otherwise, described to state line under-voltage in signal lamp unit and refer to Show that lamp is bright;
Step S2: the first voltage connecting terminal being connected with first voltage binding post in voltage measurement unit is connected to institute It states between arrester monitoring meter and arrester, by the be connected with second voltage binding post in the voltage measurement unit second electricity Crimping line terminals are connected to the ground, and in Fig. 4 shown in (b), and check whether the voltage that the voltage display screen is shown is electric in detection It presses in threshold range, if so, going to step S3, otherwise, goes to step S5;
Step S3: institute will be connected to the first current wiring terminal that the first electric current binding post is connected in current measuring unit State between arrester monitoring meter and arrester, by with that the second electric current binding post is connected in the current measuring unit is second electric Stream connecting terminal is connected to the ground, in Fig. 4 shown in (c), and the electricity that the electric current display screen checked in numeral method unit is shown Stream, if so, going to step S4, otherwise, goes to step S5 whether within the scope of detection current threshold;
Step S4: judge electric current measured by voltage that the voltage display screen is shown and arrester monitoring meter It whether is 0, if so, buzzer is continuous and constant duration responds, continuous to ring 5 times, every minor tick 1s, signal lamp unit In ground signalling indicator light it is bright, the alarm indicator goes out, prompt equipment access personnel's temporary ground wire reliable ground, if Standby access personnel disconnect the connecting line of arrester monitoring meter and arrester, can be monitored the access of device;Otherwise, it goes to Step S5;
Step S5: the alarm indicator is bright, and the buzzer is not responding to, and equipment is prompted to access personnel's temporary ground wire There is no reliable ground.
Further, in the present embodiment, the first supply voltage range is 10.8V ~ 20V;The detection voltage threshold It is different according to live specific equipment to be worth range, is~tens volts of voltages of a few volts, preferably, being 0V ~ 36V;The detection current threshold It is different according to live specific equipment to be worth range, it is several hundred uA to several mA that different voltages grade is different, preferably, be 0 mA ~ 5mA。
Further, in the present embodiment, the operation amplifier unit puts two channels of current signal collected progress Greatly, and by current range 90uA ~ 500uA low current amplify 20 times, by current range 500uA ~ 5mA Current amplifier 2 Times.
Further, in the present embodiment, the MCU control unit is when calculating voltage value or current value, by multiple Current measurement value and voltage measuring value are read, and removes the method being averaged after maximum value and minimum value.
Further, in the present embodiment, arrester monitoring one end of meter is connected to arrester, another to be connected to the earth, does not have Have across punching mutual inductor.When arrester monitors Intelligent live access protector measuring voltage on-line, two measurement terminals And it is connected to the both ends of meter;When measuring electric current, two current measurement terminals are simultaneously connected to meter both ends, are equivalent to voltage measurement at this time Terminal is shorted, therefore voltage measuring value is shown as 0, and current measurement value shows corresponding electric current, and in this case, arrester exists Line monitoring Intelligent live access protective device be judged as that temporary ground wire has been reliably connected, can disconnect arrester monitoring meter with Line between arrester, the arrester on-Line Monitor Device installed needed for accessing.Arrester monitoring meter has certain internal resistance, Monitoring meter both ends correspond to certain voltage value.Measurement table is removed using the voltage terminal of arrester Intelligent live access protective device Both ends are counted, can measure certain voltage, then by two current wiring terminals of arrester Intelligent live access protective device It is coupled with monitoring meter top and ground, since monitoring meter both ends are short-circuited, both ends voltage is zero, the voltage show value of panel Strain is 0, and the leakage current of Zinc-Oxide Arrester is then shown in electric current, and the current indication monitored on meter at this time is Zero, this state indicates temporary ground wire reliable ground, and the indicator light is always on for the reliable ground on panel, and warning light goes out, buzzing Device cipher 5 times, field device access personnel can disconnect the operation such as ground line and access device of former Zinc-Oxide Arrester.
Further, in the present embodiment, power supply is please closed in time after each detection device use, to guarantee battery Service life;Red " warning light " is to be always under default conditions, and only red " warning light " just extinguishes after ground line reliable ground;Work as dress When the line under-voltage lamp set is always on, need to charge to device in time, it is to note that it can only use and be charged with the charger of device standard configuration, Otherwise it may be damaged device.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.

Claims (8)

1. a kind of arrester on-line monitoring Intelligent live accesses protective device, which is characterized in that including a cabinet and be embedded at The intracorporal detection circuit of the case;The detection circuit includes a MCU control unit, by spi bus and the MCU control unit Connected electrical energy measurement unit, the numeral method unit being connected with the MCU control unit, with the MCU control unit phase Power supply unit even, the signal lamp unit being connected with the MCU control unit, the bee being connected with the MCU control unit Ring device, the operation amplifier unit being connected with the electrical energy measurement unit, the difference amplifier list being connected with the electrical energy measurement unit Member, the Current Mutual Inductance unit being connected with the operation amplifier unit, the current measuring unit that is connected with the current transformer with And the voltage measurement unit being connected with the difference amplifier unit;
The cabinet includes a buckle closure and passes through a pair of of lock body with the matched pedestal of the buckle closure, the buckle closure and the pedestal and lock Tightly, the detection circuit is embedded in the pedestal;The pedestal includes a bottom plate, a top plate and side plate;The top plate is opened Equipped with for being embedded the first through hole of voltage display screen in the numeral method unit, for being embedded the numeral method list Second through-hole of electric current display screen in member, for being embedded the third through-hole of power supply indicator in the signal lamp unit, using In be embedded the fourth hole that the ground signalling indicator light of reliable ground is used to indicate in the signal lamp unit, for being embedded The fifth hole of alarm indicator in the signal lamp unit, for being embedded line under-voltage in the signal lamp unit 6th through-hole of indicator light, the 7th through-hole for being embedded power switch in the power supply unit, for being embedded the power supply list 8th through-hole of charging interface, the 9th through-hole for being embedded first voltage binding post in the voltage measurement unit, use in member In be embedded the tenth through-hole of second voltage binding post in the voltage measurement unit, for being embedded in the current measuring unit 11st through-hole of one electric current binding post, the tenth two-way for being embedded the second electric current binding post in the current measuring unit Hole;The MCU control unit includes a STM32 single-chip microcontroller.
2. a kind of arrester on-line monitoring Intelligent live according to claim 1 accesses protective device, which is characterized in that institute Stating electrical energy measurement unit includes an IDT90E36.
3. a kind of arrester on-line monitoring Intelligent live according to claim 1 accesses protective device, which is characterized in that institute Stating operation amplifier unit includes an OPA2277, and the difference amplifier unit includes an AMP03GS.
4. a kind of arrester on-line monitoring Intelligent live according to claim 1 accesses protective device, which is characterized in that institute Stating power supply unit includes a 12V rechargeable lithium battery.
5. one kind is based on a kind of described in any item arrester on-line monitoring Intelligent live access protective devices of Claims 1-4 Control method, provide arrester monitoring meter, arrester monitoring meter one end is connected with arrester, another termination Ground, which comprises the steps of:
Step S1: opening the power switch of power supply unit, powers on arrester on-line monitoring Intelligent live access protective device, Voltage display screen in numeral method unit shows the voltage of lithium battery in the power supply unit, and in signal lamp unit Alarm indicator is bright;If the voltage of the lithium battery is within the scope of the first supply voltage, power supply refers in signal lamp unit Show that lamp is bright, otherwise, line under-voltage indicator light is bright in the signal lamp unit;
Step S2: the first voltage connecting terminal being connected with first voltage binding post in voltage measurement unit is connected to described keep away Thunder device monitors between meter and arrester, and the second voltage being connected with second voltage binding post in the voltage measurement unit is connect Line terminals are connected to the ground, and check voltage that the voltage display screen is shown whether within the scope of detection voltage threshold, if so, Step S3 is gone to, otherwise, goes to step S5;
Step S3: described keep away will be connected to the first current wiring terminal that the first electric current binding post is connected in current measuring unit Thunder device monitors between meter and arrester, will connect with the second electric current that the second electric current binding post is connected in the current measuring unit Line terminals are connected to the ground, and whether the electric current that the electric current display screen checked in the numeral method unit is shown is in detection electric current In threshold range, if so, going to step S4, otherwise, step S5 is gone to;
Step S4: judge electricity measured by voltage that the voltage digitron display screen is shown and arrester monitoring meter Whether stream is 0, if so, buzzer is continuous and constant duration responds, the ground signalling indicator light in signal lamp unit Bright, the alarm indicator goes out, and prompts equipment access personnel's temporary ground wire reliable ground;Otherwise, step S5 is gone to;
Step S5: the alarm indicator is bright, and the buzzer is not responding to, and equipment access personnel's temporary ground wire is prompted not have Reliable ground.
6. a kind of control method of arrester on-line monitoring Intelligent live access protective device according to claim 5, It is characterized in that, the first supply voltage range is 10.8V ~ 20V;The detection voltage threshold range are as follows: 0V ~ 36V;The inspection Survey current threshold range is 0 mA ~ 5mA.
7. a kind of control method of arrester on-line monitoring Intelligent live access protective device according to claim 5, Be characterized in that, the operation amplifier unit by current signal collected carry out two channel amplifications, and by current range 90uA ~ The low current of 500uA amplifies 20 times, by current range at 2 times of Current amplifier of 500uA ~ 5mA.
8. a kind of control method of arrester on-line monitoring Intelligent live access protective device according to claim 5, It is characterized in that, the MCU control unit is surveyed when calculating voltage value or current value by repeatedly reading current measurement value and voltage Magnitude, and remove the method being averaged after maximum value and minimum value.
CN201610104869.XA 2016-02-26 2016-02-26 A kind of arrester on-line monitoring Intelligent live access protective device and control method Active CN105572517B (en)

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CN106771411A (en) * 2017-03-20 2017-05-31 国网福建省电力有限公司 A kind of arrester meter fast fixing structure
CN106959380A (en) * 2017-03-20 2017-07-18 国网福建省电力有限公司 A kind of arrester meter Rapid wiring structure
CN108985179B (en) * 2018-06-22 2022-01-25 福建和盛高科技产业有限公司 Electric energy quality signal denoising method based on improved wavelet threshold function
CN109085444B (en) * 2018-08-08 2020-11-03 广东电网有限责任公司广州供电局 Transfer box and lightning arrester detection device thereof

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CN202614887U (en) * 2012-04-05 2012-12-19 亿达信息技术有限公司 Intelligent ground line controller
CN103869183A (en) * 2014-02-07 2014-06-18 国电南瑞科技股份有限公司 Online monitoring system and method of zinc oxide arrester
CN105021937A (en) * 2014-04-28 2015-11-04 苏州华天国科电力科技有限公司 Detector for temporary grounding wire of 10kV high-voltage line
CN203965554U (en) * 2014-04-28 2014-11-26 苏州华天国科电力科技有限公司 A kind of pick-up unit of 10kV hi-line temporary ground wire
CN204789861U (en) * 2015-07-30 2015-11-18 广东电网有限责任公司肇庆供电局 Detection and positioner of circuit ground state
CN105044542B (en) * 2015-08-04 2017-10-27 国网上海市电力公司 A kind of temporary ground wire state self checking method of power equipment
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