CN106124920B - Transformer neutral conductor virtual connection fault detection method - Google Patents
Transformer neutral conductor virtual connection fault detection method Download PDFInfo
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- CN106124920B CN106124920B CN201610485041.3A CN201610485041A CN106124920B CN 106124920 B CN106124920 B CN 106124920B CN 201610485041 A CN201610485041 A CN 201610485041A CN 106124920 B CN106124920 B CN 106124920B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
Abstract
The invention proposes a kind of transformer neutral conductor virtual connection fault detection methods, it include: after voltage device breaks down, each phase phase voltage of power distribution network three-phase L1, L2 and L3 to be measured are measured using neutral conductor virtual connection detection device, detection device includes digital multimeter, image identification unit, control unit, alarm unit and display unit；By pulling open breaker and neutral earthing come the phase voltage of repeated detection L1, L2 and L3, detection device analysis contrasting detection obtains the phase voltage of L1, L2 and L3, it analyzes and determines whether transformer has occurred neutral conductor virtual connection failure, fault warning is issued by alarm unit, display unit is shown, while being overhauled the neutral conductor and being eliminated virtual connection failure.Fault detection method proposed by the present invention is simple and convenient easily operated, and multimeter is connected in detection device, for ease of maintenaince and replaces, and is compared by the automation that control centre realizes phase voltage data, detected value and failure detection result can be with real-time displays.
Description
Technical field:
The present invention relates to low-voltage distribution fields, and in particular to transformer neutral conductor virtual connection failure.
Background technique:
In low-voltage network, transmission line of electricity generally uses three-phase four-wire system, and wherein three-line respectively represents A, B, C tri-
Phase does not divide, and another is neutral conductor N.(it is different from zero curve, in the single-phase power transmission line for entering user, there are a two lines, one
We are known as firewire to item, another we be known as zero curve, zero curve will be made up of electric in uniline electric current under normal circumstances
The circuit of stream, and in three-phase system, three-phase self-contained circuit, the neutral conductor is currentless under normal circumstances).Therefore claim three-phase and four-line
System.The N line set in 380V low-voltage network in order to obtain 220V voltage between lines from 380V voltage between phases.That is exist
In three-phase four-wire system, when being used for three-phase self-contained circuit when three-phase system, commonly referred to as N line is the neutral conductor.At single-phase circuit, claim N
Line is zero curve.Difference be the neutral conductor be it is currentless, zero curve has electric current.
Whether neutral point is grounded, also known as neutral point system.Neutral point system can be roughly divided into two major classes, i.e. neutral point
Earthed system and isolated neutral system.And according to the regulation of International Electrotechnical Commission (IEC), low-voltage distribution system is divided into
Tri- kinds of IT, TT, TN, wherein TN system is divided into TN-C, TN-S, TN-C-S three classes again.
IT system, power end live part insulation against ground or through high resistance grounding, electrical equipment metal shell is directly grounded.
IT system is suitable for the place of bad environmental condition, one phase of easy generation ground connection or fire explosion, such as coal mine, chemical plant, textile mills
Deng, it can also be used to rural area.But protector for null line breaking cannot be filled, because neutral conductor current potential is not fixed when working normally, is not also answered
Zero curve multiple grounding is set.
TT system, the system power supply neutral-point solid ground, electrical equipment metal shell are connected to and electricity with protective ground wire
The unrelated ground connection grade of source grounding point, abbreviation protective grounding or grounded system.When there is relatively large single-phase 220V electricity consumption in distribution system
Equipment, and line arrangement environment easily causes a phase earthing or zero grounding to be broken, when so as to cause zero potential raising, electrical appliance enclosure
Zero should not be connect and use TT system.TT system is suitable for the fields such as the civil buildings of cities and towns, rural settlements, industrial enterprise and dispersion
Institute.When load side and route head end sunlight are equipped with leakage switch, and trunk end is equipped with protection off zero, then it can become perfect in shape and function
System.
TN system, the power end neutral-point solid ground of TN system, electrical equipment metal shell protection zero line and this in
The connection of heart point, this mode abbreviation zero line protection or connects zero system.It must line (working zero line) and protective wire (protection zero line) in
Combination thing condition TN system divide following three kinds of forms: (1) TN-C system again.Within the system, working zero line and protection zero line
It shares (abbreviation PEN), this system habit is known as three-phase four-wire system.
TN-S system, within the system, working zero line N and protection zero line PE are completely separable since power end neutral point,
This system habit is known as three-phase five-wire mode system.
The power end neutral-point solid ground of TN system, electrical equipment metal shell protection zero line and the central point connect
It connects, this mode abbreviation zero line protection or connects zero system.In must line (working zero line) and protective wire (protection zero line) combination
Thing condition TN system divides following three kinds of forms: (1) TN-C system again.Within the system, working zero line and protection zero line share (letter
Claim PEN), this system habit is known as three-phase four-wire system.(2) TN-S system.Within the system, working zero line N and protection zero
Line PE is completely separable since power end neutral point, this system habit is known as three-phase five-wire mode system.(3) TN-C-S system.
Within the system, working zero line is partial common with protection zero line, this system is local three-phase five-wire mode system.
Should be noted that the following: 1. TN-C system is suitable for equipped with single-phase 220V, portable type, mobile electrical equipment, and
The single-phase fixed electrical equipment of 220V is also less, but need not meet zero industrial enterprise；TN-S system is suitable for industrial enterprise, high
Layer building and large-scale civil buildings；TN-C-S system is suitable for industrial enterprise；When load side is equipped with electric leakage beginning trunk end
When equipped with protection off zero, it can also be used to new residential area.2. TN-C, TN-S, TN-C-S system operate normally when,
Zero curve current potential is sometimes up to 50V or more；TN-C system shell current potential is equal to working zero line current potential, and TN-S system shell current potential is
Zero, TN-C-S system shell current potential are not zero, and are equal to zero main line current potential of work.3. when electrical equipment one collides shell, TN system
The short circuit current of system is larger.Shell current potential >=110V at shell is touched, as long as design is rationally, the time is shorter；If human body is accidental
Risk when touching live part is big；TN-C system, when phase fault protective device sensitivity is inadequate, due to equipment outside
Shell meets working zero line N, and equipment is on-insulated over the ground, and when normal work, leakage switch can not be worked by residual current, so not
Leakage switch can be filled, zero-sequence over-current protection can only be used；TN-S system is worked normally since device housings meet protection zero line PE
When, leakage switch is without residual current, so can install leakage switch when phase fault protective device sensitivity is inadequate to protect
Single-phase run into carapace short；TN-C-S system, PE, N shared trunk section cannot use earth leakage protective, and PE, N points of line segments opened can use leakage
Electric protection, electrical equipment can use earth leakage protective.4. TN-C system earth short circuit current is smaller, usually when one phase of route ground connection
It is insufficient to allow the protection of route phase fault and zero sequence protection device movement, to make transformer zero-bit and all connect zero device housings
Long-term electrification, grounding point resistance are smaller more dangerous；Substation ground device should be using the equal pressing ring of annular；Main line head end cannot be installed
Earth leakage protective can not cut off the big disadvantage that one phase ground fault of route is TN-C system；TN-S system, except having and TN-
Outside the identical feature of C system, earth leakage circuit-breaker can be installed in route head ends at different levels to cut off faulty line；TN-C-S system
System, except with TN-C system have the characteristics that it is identical in addition to, part route can install earth leakage protective.5. when working zero line disconnects, TN-
Due to three-phase load asymmetry after C system point off zero, zero drift, 220V single-phase equipment may be burnt, and electrical equipment shell
Zero is connect, outer casing electrification is made, jeopardizes personal safety.Zero curve is broken in single-phase circuit, and whole 220V voltages will be added on device housings；
Device housings current potential is caused to increase due to off zero, earth leakage protective does not work；Zero main line of TN-S system three-phase circuit disconnects
Meeting burning apparatus, but shell is not charged, and the person is without danger；Zero curve disconnects in single-phase circuit, to the person and equipment safety without danger
Evil；TN-C-S system protective earthing-neutral conductor disconnects, and the person is dangerous, and the person is without danger when N line disconnects, but zero main line that works disconnects equal energy
Cause burning for equipment.6. no matter TN-C system should connect zero curve multiple grounding in route one about multiple grounding problem
Ground, zero curve disconnect or one collides under the fault conditions such as shell or each phase load is seriously under asymmetric normal running (operation) conditions, equal energy
Zero curve and electrical appliance enclosure current potential are reduced, but the danger of electric shock can not be eliminated；The scrappy line of the work of TN-C system should not weigh
Multiple connection, but protection zero line can be with multiple grounding when necessary.Because working zero line multiple grounding to protect personal safety effect not
Greatly, also unobvious to rear protection safety effect off zero；After working zero line ground connection, main line head end just cannot use earth leakage protective；It protects
Protect zero curve multiple grounding, the current potential of shell when can reduce run into carapace short；Protective earthing-neutral conductor in TN-C-S system answers multiple grounding, N line
Unsuitable multiple grounding.7. installing protector for null line breaking, effect is: can rise in TN-C and TN-C-S system in TN system
Pleiotropic Protections can prevent from using electric equipment outer casing electrification because zero curve disconnects, and burn single-phase 220V electrical equipment；It can be anti-
Only electrical equipment shell is caused to charge for a long time because one phase of route is grounded；When can prevent from operating normally, due to dissymmetrical load and
The presence of triple-frequency harmonics and zero curve selection are unreasonable, cause that zero curve pressure drop is excessive and transformer zero drift, and make zero curve and
It connects zero device housings and generates high potential；When electrical equipment one is collided shell, and short-circuit protection sensitivity is inadequate, back-up protection can be played
Effect, prevents large stretch of electrical equipment shell from charging for a long time；For TN-S system, can prevent from burning list because working zero line disconnects
Phase 220V electrical equipment；When one phase of route is grounded, and electrical equipment is caused to be charged, back-up protection can be played；It can prevent just
Often working zero line current potential is excessively high when operation.8. it should be recommended to use TN-S system in above-mentioned IT system, TT system, TN system,
TN-C-S system is continued to use, stops promoting the use of TN-C system.Currently, being for the most common low-voltage distribution system in China
TN-C-S system.
In low-voltage distribution system operational process, transformer inevitably will appear the failures such as broken neutral line, virtual connection, if
Analysis neutral conductor virtual connection failure cannot be searched in time, and many harm can be brought to power distribution network.Power distribution network transformer neutral conductor virtual connection
In the process, if during L1 phase is grounded, electric current will be generated and flow through distribution transformer earthing line, be easy to cause electric shock existing
The generation of elephant；In distribution transformer neutral conductor virtual connection operation, threephase load ability will be made to occur uneven, to distribution occur
Voltage device neutral point generates certain offset, has been more than zero on the index of grounding point current potential, so that the electricity of some phases can be promoted
Pressure, holds the operation of vulnerable equipment.
The detection side of neutral conductor virtual connection failure is disclosed in document " troubleshooting that equipment mains neutral line virtual connection causes "
Method is checked, measuring device electric wiring using high-and-low temperature humid heat test box overtemperature alarm failure, final to confirm that failure cause is
Equipment mains neutral line virtual connection, analysis mains neutral line virtual connection are influenced to caused by equipment.Although can be in accurate determination
Property line virtual connection failure, but need more complicated high-and-low temperature humid heat test box, improve cost.
A kind of neutral line breakage detection protection method and device are disclosed in patent document CN 102801131B, are belonged to low
Press system protection technical field.The device is mainly by current detecting unit, detection signal conversion unit, signal processing unit, guarantor
It protects execution unit and acousto-optic warning unit forms.This method passes through acquisition triple line and neutral current signal, then by single-chip microcontroller
Processing analysis is carried out to signal, thus judges whether the neutral conductor breaks, single-chip microcontroller sending acts when the neutral conductor breaks
Signal disconnecting circuit simultaneously sounds an alarm.Element used in the present invention is simple and easy, the degree of automation is higher, can effectively detect
Property line broken string situation and it is implemented to protect, engineer application is preferable.But structure of the detecting device is complex, and cannot detect
Neutral conductor virtual connection.
Summary of the invention:
The invention proposes a kind of transformer neutral conductor virtual connection fault detection method, include the following steps: 1) voltage device hair
After raw failure, each phase phase voltage of power distribution network three-phase L1, L2 and L3 to be measured, the inspection are measured using neutral conductor virtual connection detection device
Surveying device includes digital multimeter, image identification unit, control unit, alarm unit and display unit；2) detection device is analyzed
Contrasting detection obtains the phase voltage of L1, L2 and L3, if the phase voltage of L1, L2 and L3 is not identical, shows transformation by display unit
There is failure in device；3) after pulling open breaker, the voltage of three-phase L1, L2 and L3 are detected, if each phase voltage is normal, and outside distribution box
Shell normal ground, the neutral conductor is unearthed, and case interior insulation conducting wire appearance is without exception, and each contact connection fastening continues checking；4) matching
By neutral earthing at electronic box, the neutral conductor and box shell, grounding flat steel are done into good connection with conducting wire, pass through detection after combined floodgate power transmission
Device detects each phase voltage and after 4-8 hour of trial operation, detects each phase voltage by detection device if each phase voltage is normal, if
Each phase voltage is not identical, then neutral conductor virtual connection failure has occurred in the transformer, issues fault warning by alarm unit, shows simultaneously
Show that unit shows that neutral conductor virtual connection failure occurs in transformer；5) by repairing the neutral conductor or the replacement neutral conductor, the neutral conductor is eliminated
Virtual connection failure.
Further, digital multimeter is connected in detection device.
Further, digital multimeter includes ampere meter, voltmeter, ohmmeter function.
Further, the precision of digital multimeter is between ± (0.7%+1) and ± (0.1%+1) of reading.
Further, image identification unit is located above digital multimeter, for reading the voltage digital of multimeter.
Further, detection device further includes switching switch, and control unit control switching switch motion makes digital multimeter
The voltage of each phase of L1, L2 and L3 is detected respectively.
Further, alarm unit includes LED light and loudspeaker.
Further, display unit includes liquid crystal display or light-emitting diode display.
Further, in step 4), after operation 5 hours, each phase voltage is detected by detection device.
The invention has the benefit that
1, simple to operate using the neutral conductor virtual connection failure of detection device detection low-voltage network transformer.
2, it is shown by alarm unit and display unit and neutral conductor virtual connection failure has occurred, watchful effect can be played；
3, detection device detects the voltage of each phase of L1, L2 and L3 using existing digital multimeter, convenient succinct, general-purpose
Table is connected in detection device, for ease of maintenaince and is replaced.
4, detection device controls the automatic switchover of switching switch by control unit, detects the phase voltage of three phases respectively
Value, and by the reading of digital image understanding unit identification digital versatile, automatic comparison provides as a result, realizing automation pair
Than.
5, the detected value and comparing result and failure detection result of each phase voltage can be shown with display unit, can be intuitive
Check.
Detailed description of the invention:
Fig. 1 is detection device schematic diagram.
Fig. 2 is the flow chart of transformer neutral conductor virtual connection trouble shoot analysis method of the present invention.
Specific embodiment:
The invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, being the structural schematic diagram of neutral conductor virtual connection detection device of the present invention, detection device includes digital versatile
Table, image identification unit, control unit, alarm unit and display unit.Digital multimeter is common digital multimeter, includes
Ampere meter, voltmeter, ohmmeter function, the precision of table is between ± (0.7%+1) and ± (0.1%+1) of reading.Digital versatile
Table is connected in detection device, and for detecting the voltage of each phase of L1, L2 and L3, convenient succinct, multimeter is connected to detection device
In, for ease of maintenaince and replace.
Transformer neutral conductor virtual connection fault detection method proposed by the present invention, is illustrated in figure 2 specific flow chart, including
Following steps:
1) after voltage device breaks down, power distribution network three-phase L1, L2 and L3 to be measured are measured using neutral conductor virtual connection detection device
Each phase phase voltage, the detection device includes digital multimeter, image identification unit, control unit, alarm unit and display
Unit, image identification unit are located above digital multimeter, pass for reading the voltage digital of multimeter, and by the data of reading
Give control centre.
2) detection device analysis contrasting detection obtains the phase voltage of L1, L2 and L3.The control centre of detection device includes single
Piece machine and memory module, control centre's control switching switching, make multimeter detect the phase voltage of L1, L2 and L3 respectively.Control
After center processed receives the data that image identification unit is sent, the phase voltage of L1, L2 and L3 are sent to memory module first
Storage, and the phase voltage data transmission of L1, L2 and L3 are shown to display unit.Post analysis comparison L1, L2 and L3 it is mutually electric
Data are pressed, if the phase voltage of L1, L2 and L3 is not identical, show that failure occurs in transformer by display unit.
3) after pulling open breaker, then the voltage of three-phase L1, L2 and L3 are detected, if each phase voltage is normal, i.e. L1, L2 and L3
Phase voltage is equal, checks whether distribution box enclosure is bolted with grounding flat steel at this time, and whether the neutral conductor is grounded, in case absolutely
Whether the visual examination of edge conducting wire is abnormal, if each contact connection fastening distribution box enclosure normal ground, the neutral conductor is unearthed, in case absolutely
Edge conducting wire appearance is without exception, and each contact connection fastening continues the inspection of next step.
4) by neutral earthing at distribution box, the neutral conductor and box shell, grounding flat steel is done into good connection with conducting wire, closed a floodgate
Each phase voltage is detected by detection device after power transmission, if each phase voltage is normal, after 4-8 hour of trial operation, preferred operation 5 is small
When, after combined floodgate power transmission, trial operation for a period of time, makes the transformer of system and electric operation tend towards stability state；Trial run time
Too short, the failure of system cannot show completely, and runing time is too long, if failure has had occurred in system, can to transformer and
Power distribution network brings harm.This can be determined if each phase voltage is not identical by detecting each phase voltage again by detection device later
Neutral conductor virtual connection failure has occurred in transformer, issues fault warning by alarm unit, while display unit shows that transformer goes out
Neutral conductor virtual connection failure is showed.Alarm unit includes LED light and loudspeaker, can play better watchful effect.Display unit
Including liquid crystal display or light-emitting diode display, the detected value and comparing result and failure detection result of each phase voltage can be shown
Unit is shown, can intuitively be checked.
5) it is checked after and repairs the neutral conductor, eliminate neutral conductor virtual connection failure.If neutral conductor embedment underground is enclosed in wall etc.
In position, it is contemplated that be laid with new route as the neutral conductor, to eliminate neutral conductor virtual connection failure, ensure low-voltage network system
The normal operation of system and transformer.
Trouble shoot analysis
In three-phase and four-line low-pressure system, be respectively connected to a large amount of single-phase equipment because the asynchronism that uses of equipment and
The randomness of opening of device, three-phase load unbalance are inevitable.Since construction technology, overcurrent and heat, maintenance are ineffective, outer
Power such as destroys at the reasons, and disconnection fault may occur, once broken neutral line, neutral point potential can generate displacement after breakpoint,
Cause three-phase voltage disequilibrium, load is bigger, and phase voltage is lower, and the smaller phase voltage of load is higher.This is because original is connected to difference
Separate single-phase equipment becomes being followed by between rail voltage of series connection, according to the principle that series circuit divides, the big (load of impedance
It is small) one group of equipment divide high, burning apparatus is even caused into fire, one group of equipment partial pressure of impedance small (load is big) when serious
It is low, equipment then cisco unity malfunction.
As the high phase electrical equipment of voltage is burned out, load exits, impedance becomes larger, and the phase voltage is higher and higher, and electric
The more more then impedances of the phase used device forced down are smaller, and voltage is lower, such vicious circle, cause phase voltage is minimum can be to tens
Volt reaches as high as lying prostrate 300 more.It is initially an extreme example with the data that multimeter measures in monitoring station.In addition the station at that time
Apparent equipment burnout phenomenon does not occur, this is also easy to cause tester to make false judgment.
The neutral conductor is after user terminal implements ground connection, and when three-phase load unbalance, the grounded point of out-of-balance current passes through big
Ground flows back to distribution transformer secondary side neutral point, to reduce neutral-point displacement after breakpoint, makes the end voltage of single-phase equipment
Will not deviation it is excessive.After equipment normal use, three-phase load unbalance degree increases, since the impedance ratio of the earth is larger, although
Neutral earthing is good, still not can guarantee that each phase voltage is symmetrical, and the neutral conductor only influences whether the phase electricity of load side after disconnecting
Pressure, will not influence line voltage.
Use the earth as current path neutral conductor multiple grounding because the impedance of the neutral conductor be in terms of milliohm, and it is big
The impedance of earth-return is then with ohmmeter, and the two differs greatly, so the three-phase voltage after the disconnected neutral conductor still can be serious uneven
Weighing apparatus, only degree is slightly lighter.It is obtained in conjunction with previous similar analysis of cases: limiting broken neutral line with multiple grounding
Caused load phase voltage is asymmetric, is not the measure of an essence, generated technical effect is extremely limited.
Through according to the analysis, since the gear internal resistance of multimeter voltage is very big, flowing through the electric current of meter itself very when measuring voltage
Small, consumed power also very little, such electric current is when by neutral conductor virtual connection, the pressure drop very little of generation, resistance at virtual connection
General-purpose meter reading is not significantly affected, so causing the enough illusion of voltage.After connecting load, resistance produces circuit at virtual connection
Raw very big pressure drop, even in off state；If being tested when unloaded with light bulb, it finds that do not work, if experience is owed at all
It lacks or rash, this false voltage is easy to cause the false judgment of maintenance personal.
Claims (9)
1. a kind of transformer neutral conductor virtual connection fault detection method, which comprises the steps of: 1) empty using the neutral conductor
Connect each phase phase voltage that detection device measures power distribution network three-phase L1, L2 and L3 to be measured, the detection device include digital multimeter,
Image identification unit, control unit, alarm unit and display unit；2) detection device analysis contrasting detection obtains L1, L2 and L3
Phase voltage, if the phase voltage of L1, L2 and L3 is not identical, by display unit show transformer there is failure；3) it pulls open disconnected
After the device of road, the voltage of three-phase L1, L2 and L3, if each phase voltage is normal, and distribution box enclosure normal ground, the neutral conductor are detected again
Unearthed, case interior insulation conducting wire appearance is without exception, and each contact connection fastening continues checking；4) neutral conductor is connect at distribution box
The neutral conductor and box shell, grounding flat steel are done good connection with conducting wire by ground, and it is electric by detection device to detect each phase after combined floodgate power transmission
Pressure, if each phase voltage is normal, after 4-8 hour of trial operation, detects each phase voltage by detection device, if each phase voltage not phase
Together, then neutral conductor virtual connection failure has occurred in the transformer, issues fault warning by alarm unit, while display unit display becomes
There is neutral conductor virtual connection failure in depressor；5) by repairing the neutral conductor or the replacement neutral conductor, neutral conductor virtual connection failure is eliminated.
2. fault detection method according to claim 1, which is characterized in that the digital multimeter is connected to detection device
In.
3. fault detection method according to claim 2, which is characterized in that the digital multimeter includes ampere meter, electricity
Press table, ohmmeter function.
4. fault detection method according to claim 2, which is characterized in that the precision of the digital multimeter is in reading
Between ± (0.7%+1) and ± (0.1%+1).
5. fault detection method according to claim 1, which is characterized in that described image recognition unit is located at digital versatile
Above table, for reading the voltage digital of multimeter.
6. fault detection method according to claim 1, which is characterized in that the detection device further includes switching switch,
Control unit control switching switch motion, makes digital multimeter detect the voltage of each phase of L1, L2 and L3 respectively.
7. fault detection method according to claim 1, which is characterized in that the alarm unit includes LED light and loudspeaking
Device.
8. fault detection method according to claim 1, which is characterized in that the display unit include liquid crystal display or
Light-emitting diode display.
9. fault detection method according to claim 1, which is characterized in that in the step 4), after operation 5 hours, lead to
It crosses detection device and detects each phase voltage.
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| CN105720602B (en) * | 2016-01-21 | 2019-02-05 | 易事特集团股份有限公司 | Parallel network power generation energy storage inverter is grid-connected-off-grid system and its running gear |
| CN106872854B (en) * | 2017-01-26 | 2019-10-01 | 南京陇源汇能电力科技有限公司 | The fault handling method of power distribution automation equipment in a kind of distribution system |
| CN108761270A (en) * | 2018-08-18 | 2018-11-06 | 无锡诚勇自动化技术有限公司 | A kind of wire break alarm |
| CN109188181B (en) * | 2018-09-08 | 2020-09-04 | 国网山西省电力公司电力科学研究院 | Virtual connection judgment method for neutral line of secondary circuit of power grid voltage transformer |
| CN111060846B (en) * | 2019-12-19 | 2022-03-22 | 深圳供电局有限公司 | CT secondary circuit fault on-line monitoring method |
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