CN105988064A - Functional meter capable of locating fault point and method used for locating fault point and applied to functional meter - Google Patents
Functional meter capable of locating fault point and method used for locating fault point and applied to functional meter Download PDFInfo
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- CN105988064A CN105988064A CN201510822035.8A CN201510822035A CN105988064A CN 105988064 A CN105988064 A CN 105988064A CN 201510822035 A CN201510822035 A CN 201510822035A CN 105988064 A CN105988064 A CN 105988064A
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Abstract
The invention provides a functional meter capable of locating a fault point and a locating method of the functional meter. With the functional meter and the locating method thereof adopted, the fault point can be located fast, power supply recovery time can be greatly decreased, economic losses of power supply departments and users can be reduced, and power supply reliability can be improved. The functional meter includes three voltage transformers, three relays I, a switching power source, a voltage detection unit, three current transformers, three relays II, three green lamp indication circuits, a current detection unit, three self-providing power sources, three relays III, a power multiplication unit, a control unit, a self-providing power source discharge monitoring unit, a memory I, a display unit I, a wireless transmission control module, a wireless receiving control module, a processing unit, a memory II and a power grid circuit geographic map electronic simulation board; an overcurrent switch and a zero-current action switch are connected in series so as to form each relay II; the relays II are corresponding to various kinds of line fracture and short-circuiting faults respectively; and the self-providing power sources are connected with red and green light indication units through the relays III, so that a discharge loop can be formed.
Description
Technical field
The present invention relates to a kind of can fault point menu and to position of failure point location method, in the low-voltage distributing line of the secondary side being arranged on high-tension transformer, the line fault point of 10kV high-tension line and low-voltage circuit can be positioned.
Background technology
At present, when overhead transmission line occurs various short trouble, take artificial line walking to search trouble point, search the time the longest, cause the cycle recovering power transmission work longer, especially at night, line walking work difficulty is huge, there may come a time when that an evening all can not find trouble point, affect normal power supply, cause economic loss to power supply department and user, and bring life inconvenience to resident, reduce electrical network power supply reliability.
Summary of the invention
The technical problem to be solved in the present invention is to provide one can quick fault point position, it is greatly shortened the time of restoring electricity, reducing power supply department and user's economic loss, that improves power supply reliability can the menu of fault point and method to position of failure point location thereof.
This can the menu of fault point, including:
Three voltage transformers corresponding with A, B, C, change input voltage according to equipment requirements；
Three relay I, it is to there is time delay disconnect the normally closed switch of instantaneous Guan Bi and be connected for controlling A, B, C three phase supply with corresponding voltage transformer respectively, when circuit generation phase fault or broken string, faulted phase voltage raises, trouble point upper level chopper disconnects, if reclosing failure, fault phase relay I time delay disconnects；When fault phase ground short circuit, faulted phase voltage reduces, and fault phase relay I is failure to actuate；
Switching Power Supply, input is connected in a phase line, is used for powering to each unit when circuit is normal；
Voltage detection unit, is arranged to the voltage of measurement circuitry；
Three current transformers corresponding with A, B, C, according to line load situation so that the electric current of input electric cur-rent measure unit reaches equipment requirements；
Three relay II, it is connected with corresponding current transformer respectively, when line failure, cut off the faulty circuit being input to current detecting unit, each relay II is in series by an overcurrent switch and zero current step switch, correspondence broken string and various short troubles respectively, and overcurrent switch and zero current step switch are all to have time delay to disconnect the normally closed switch of instantaneous closure function, and identical for turn-off time with the time delay of relay I, the stable fault current that flows through in circuit after fault occurs to ensure storage arrangement to record；
Three green light indicating circuits, are connected with corresponding relay II respectively, are used to refer to circuit normal power supply state；
Current detecting unit, input and three green light indicating member outfans are connected, and are arranged to the electric current of measurement circuitry；
Three power autonomous, constitutes charge circuit between leading-out terminal and the ground wire of the relay II being connected on correspondence respectively；Three relay III, for the normal open switch of the instantaneous disconnection of timing closing, the time delay turn-off time more than relay I and the relay II timing closing time of relay III；The power autonomous composition discharge loop that is connected with red light indicating member by relay III, it is that each unit is powered by red light indicating member after line fault, power autonomous have charging/discharging function, power autonomous when circuit is normal it is charged, during line fault and after relay III closes, discharge loop conducting continues power supply for current detecting unit and voltage detection unit and detects line condition；
Electrical power multiplication unit, is connected with voltage detection unit and current detecting unit outfan；
Control unit, built-in IP address information, it is connected on the outfan of electrical power multiplication unit, when circuit is normal, gathers voltage x current and the information of power；During line fault, according to voltage and current data, calculating the distance of trouble point and this menu, this distance is in the range of error allowed, and this result is stored；
Power autonomous electric discharge monitoring means, for monitoring power autonomous discharge condition, when power autonomous transferred to electric discharge by charging after, this unit provides signal to control unit, control unit is made no longer to receive the power signal that electrical power multiplication unit provides, but only receive the size of voltage x current, and it is processed into the information of trouble point and menu distance；
Memory I, is connected with control unit, the track data that storage collects；
Display unit, is connected on the outfan of control unit, selects LCDs, for storage data being shown；
Storage data are sent by wireless transmission control module by wireless；
Wireless receiving control module, is used for accepting the wireless signal that wireless transmission control module sends；
Processing unit, is connected on the outfan of wireless receiving control module；
Memory I I, is connected with processing unit, is used for storing line voltage distribution, the current data collected；
Power network line geographical map electronic simulation plate, it is connected with processing unit, have and reception storage data and fault message are demonstrated, and this analog board circuit is designed to the circuit geographical position figure that circuit is actual, geographical position and ruuning situation that circuit and menu are installed can clearly be seen by power network line geographical map electronic simulation plate, after breaking down, position of failure point and function table id all show in power network line geographical map electronic simulation plate, this power network line geographical map electronic simulation plate is arranged in power distribution rush-repair class and the control room of electric company, to monitor grid operating conditions in real time, very first time process accident.
Utilize described menu and the method to position of failure point location thereof, comprise the following steps:
1, menu is arranged on the secondary side of power transformation device, and when circuit normally works, current detecting unit receives the three-phase current of circuit, and when circuit normally works, relay III is in open position, and green light shows that circuit is normal, and persistently gives power autonomous charging；
2, work as line failure, relay II wouldn't action, wait circuit re-switching, if closing a floodgate successfully, describe the problem releasing, relay protection is failure to actuate；If fault does not eliminates, after unsuccessful reclosing, relay II is to increase or go to zero according to fault current, determines to be cut off circuit by internal overcurrent switch or zero current step switch, and time-lag action is the time avoiding circuit re-switching；Relay III also begins to Guan Bi after the switch motion in relay II, but the delay time of relay III is more than the delay time of relay II, power autonomous line conduction, it is achieved discharging function, and green light extinguishes, and when red shows that this phase line breaks down；When line fault eliminates, the instantaneous combined floodgate of relay II, green light, now relay III action, instantaneous disconnection, red light extinguishes, and power autonomous supply line disconnects, and enters charged state.
3, when circuit is properly functioning, when there is phase fault in voltage detection unit detection three-phase voltage, faulted phase voltage raises, and relay I time delay is failure to actuate, when disconnecting after unsuccessful reclosing, fault phase relay I disconnects, and voltage detection unit fault phase is by power autonomous power supply；When circuit recovers normal, the instantaneous Guan Bi of relay I, cut off power autonomous loop；Other faults, fault phase is constant or reduces, and relay I is failure to actuate.
4, when circuit is normal, electrical power multiplication unit receives electric current and the signal of voltage detection unit input, through the algorithm that inside chip sets, calculates current line power, and voltage, electric current and power data are sent to control unit；
5, when after power autonomous electric discharge, signal is sent to control unit by power autonomous electric discharge monitoring means, the analogue signal of reception is converted to digital signal by control unit, and by the algorithm set, digital signal is calculated fault current and resistance, it is achieved calculate the function of trouble point distance.Related data stored device I inputs wireless transmission control module, is also sent to display unit；
6, after radio transmission control module sends signal, long-range wireless receiving control module receives signal, signal is sent to power network line geographical map electronic simulation plate after storing memory I I, analog board is to demonstrate related data, realize the menu and trouble point sending failure warning is sent in analog board red light warning, now because of circuit relay protection action reason, have trouble point and send fault alarm to multiple menus of load side, but near mains side is near trouble point, analog board because being fabricated to the geographical position figure of reality by circuit, so employee can determine that geographic location, trouble point and affiliated bar number, power distribution rush-repair class employee can arrive scene and find trouble point easily.
The invention has the beneficial effects as follows:
1, can quick fault point position, be greatly shortened the time of restoring electricity, reduce power supply department and user's economic loss, improve power supply reliability.
2, after utilizing this menu, when line failure, former line walking works and will become following steps:
Breaking down after barrier operation failure in road, power distribution rush-repair class is informed by relevant transformer station, and so-and-so occurs what kind of fault by circuit；Power network line geographical map electronic simulation plate is checked by power distribution rush-repair class, finds belonging to the function table id and position and trouble point bar reported to the police near mains side number；Repairing class member carries required construction material, directly arrives and specifies trouble point, completes to rush to repair work.
Accompanying drawing explanation
Fig. 1 is the wiring connection figure of the present invention；
Fig. 2 is the topological diagram of the present invention；
Fig. 3 is the power network line geographical map electronic simulation plate structure schematic diagram of the present invention.
Detailed description of the invention
As shown in Figure 1, this menu equipment totally 10 terminals, terminal 1,2 is power supply terminal, power supply is only powered by A phase, therefore A phase connecting terminal 1, terminal 2 connecting to neutral line, three voltage transformer lead-in wire terminals connect A, B, C three-phase respectively, the zero line lead-in wire terminal 6 connecting to neutral line N of relay I, the lead-in wire terminal 7,9,11 of current transformer is connected on A, B, C three-phase, power autonomous zero line leading-out terminal 8,10,12 connecting to neutral line N respectively.
This can the menu of fault point, including with lower unit:
Three voltage transformers corresponding with A, B, C, change input voltage according to equipment requirements；
Three relay I, it is to there is time delay disconnect the normally closed switch of instantaneous Guan Bi and be connected for controlling A, B, C three phase supply with corresponding voltage transformer respectively, when circuit generation phase fault or broken string, faulted phase voltage raises, trouble point upper level chopper disconnects, if reclosing failure, fault phase relay I time delay disconnects；When fault phase ground short circuit, faulted phase voltage reduces, and fault phase relay I is failure to actuate；
Switching Power Supply, input is connected in a phase line, is used for powering to each unit when circuit is normal；
Voltage detection unit, is arranged to the voltage of measurement circuitry；
Three current transformers corresponding with A, B, C, according to line load situation so that the electric current of input electric cur-rent measure unit reaches equipment requirements；
Three relay II, it is connected with corresponding current transformer respectively, when line failure, cut off the faulty circuit being input to current detecting unit, each relay II is in series by an overcurrent switch and zero current step switch, correspondence broken string and various short troubles respectively, and overcurrent switch and zero current step switch are all to have time delay to disconnect the normally closed switch of instantaneous closure function, and identical for turn-off time with the time delay of relay I, the stable fault current that flows through in circuit after fault occurs to ensure storage arrangement to record；
Three green light indicating circuits, are connected with corresponding relay II respectively, are used to refer to circuit normal power supply state；
Current detecting unit, input and three green light indicating member outfans are connected, and are arranged to the electric current of measurement circuitry；
Three power autonomous, selects UPS accumulator, constitutes charge circuit between leading-out terminal and the ground wire of the relay II being connected on correspondence respectively；Three relay III, for the normal open switch of the instantaneous disconnection of timing closing, the time delay turn-off time more than relay I and the relay II timing closing time of relay III；The power autonomous composition discharge loop that is connected with red light indicating member by relay III, it is that each unit is powered by red light indicating member after line fault, power autonomous have charging/discharging function, power autonomous when circuit is normal it is charged, during line fault and after relay III closes, discharge loop conducting continues power supply for current detecting unit and voltage detection unit and detects line condition；
Electrical power multiplication unit, is connected with voltage detection unit and current detecting unit outfan；
Control unit, built-in IP address information, it is connected on the outfan of electrical power multiplication unit, when circuit is normal, gathers voltage x current and the information of power；During line fault, according to voltage and current data, calculating the distance of trouble point and this menu, this distance is in the range of error allowed, and this result is stored；
Power autonomous electric discharge monitoring means,: when power autonomous transferred to electric discharge by charging after, this unit provides signal to control unit, make control unit no longer receive electrical power multiplication unit provide power signal, but only receive the size of voltage x current, and it is processed into the information of trouble point and menu distance；
Memory I, is connected with control unit, the track data that storage collects；
Display unit, is connected on the outfan of control unit, selects LCDs, for storage data being shown；
Storage data are sent by wireless transmission control module by wireless；
Wireless receiving control module, is used for accepting the wireless signal that wireless transmission control module sends；
Processing unit, is connected on the outfan of wireless receiving control module；
Memory I I, is connected with processing unit, is used for storing line voltage distribution, the current data collected；
As shown in Figure 3, power network line geographical map electronic simulation plate, it is connected with processing unit, have and reception storage data and fault message are demonstrated, and this analog board circuit is designed to the circuit geographical position figure that circuit is actual, geographical position and ruuning situation that circuit and menu are installed can clearly be seen by power network line geographical map electronic simulation plate, after breaking down, position of failure point and function table id all show in power network line geographical map electronic simulation plate, this power network line geographical map electronic simulation plate is arranged in power distribution rush-repair class and the control room of electric company, to monitor grid operating conditions in real time, very first time process accident.
Utilize described menu and the method to position of failure point location thereof, comprise the following steps:
1, menu is arranged on the secondary side of power transformation device, and when circuit normally works, current detecting unit receives the three-phase current of circuit, and when circuit normally works, relay III is in open position, and green light shows that circuit is normal, and persistently gives power autonomous charging；
2, work as line failure, relay II wouldn't action, wait circuit re-switching, if closing a floodgate successfully, describe the problem releasing, relay protection is failure to actuate；If fault does not eliminates, after unsuccessful reclosing, relay II is to increase or go to zero according to fault current, determines to be cut off circuit by internal overcurrent switch or zero current step switch, and time-lag action is the time avoiding circuit re-switching；Relay III also begins to Guan Bi after the switch motion in relay II, but the delay time of relay III is more than the delay time of relay II, power autonomous line conduction, it is achieved discharging function, and green light extinguishes, and when red shows that this phase line breaks down；When line fault eliminates, the instantaneous combined floodgate of relay II, green light, now relay III action, instantaneous disconnection, red light extinguishes, and power autonomous supply line disconnects, and enters charged state.
3, when circuit is properly functioning, when there is phase fault in voltage detection unit detection three-phase voltage, faulted phase voltage raises, and relay I time delay is failure to actuate, when disconnecting after unsuccessful reclosing, fault phase relay I disconnects, and voltage detection unit fault phase is by power autonomous power supply；When circuit recovers normal, the instantaneous Guan Bi of relay I, cut off power autonomous loop；Other faults, fault phase is constant or reduces, and relay I is failure to actuate.
4, when circuit is normal, electrical power multiplication unit receives electric current and the signal of voltage detection unit input, through the algorithm that inside chip sets, calculates current line power, and voltage, electric current and power data are sent to control unit；
5, when after power autonomous electric discharge, signal is sent to control unit by power autonomous electric discharge monitoring means, the analogue signal of reception is converted to digital signal by control unit, and by the algorithm set, digital signal is calculated fault current and resistance, it is achieved calculate the function of trouble point distance.Related data stored device I inputs wireless transmission control module, is also sent to display unit；
6, after radio transmission control module sends signal, long-range wireless receiving control module receives signal, signal is sent to power network line geographical map electronic simulation plate after storing memory I I, analog board is to demonstrate related data, realize the menu and trouble point sending failure warning is sent in analog board red light warning, now because of circuit relay protection action reason, have trouble point and send fault alarm to multiple menus of load side, but near mains side is near trouble point, analog board because being fabricated to the geographical position figure of reality by circuit, so employee can determine that geographic location, trouble point and affiliated bar number, power distribution rush-repair class employee can arrive scene and find trouble point easily.
After utilizing this menu, when line failure, former line walking works and will become following steps:
1, after the failure of line failure barrier operation, power distribution rush-repair class is informed by relevant transformer station, and so-and-so occurs what kind of fault by circuit；
2, power network line geographical map electronic simulation plate is checked by power distribution rush-repair class, finds belonging to the function table id and position and trouble point bar reported to the police near mains side number；
3, repairing class member carries required construction material, directly arrives and specifies trouble point, completes to rush to repair work.
Claims (2)
1. can the menu of fault point, it is characterized in that including:
Three voltage transformers corresponding with A, B, C, change input voltage according to equipment requirements；
Three relay I, are to have time delay disconnect the normally closed switch of instantaneous Guan Bi and be used in conjunction mutually with corresponding voltage transformer respectively
Controlling A, B, C three phase supply, when circuit generation phase fault or broken string, faulted phase voltage raises, trouble point upper level
Chopper disconnects, if reclosing failure, fault phase relay I time delay disconnects；When fault phase ground short circuit, faulted phase voltage drops
Low, fault phase relay I is failure to actuate；
Switching Power Supply, input is connected in a phase line, is used for powering to each unit when circuit is normal；
Voltage detection unit, is arranged to the voltage of measurement circuitry；
Three current transformers corresponding with A, B, C, according to line load situation so that the electricity of input electric cur-rent measure unit
Stream reaches equipment requirements；
Three relay II, are connected with corresponding current transformer respectively, when line failure, cut off and are input to electric current inspection
Surveying the faulty circuit of unit, each relay II is in series by an overcurrent switch and zero current step switch, correspondence respectively
Broken string and various short troubles, and overcurrent switchs and zero current step switch all has time delay and disconnects instantaneous closure function
Normally closed switch, and identical for turn-off time with the time delay of relay I, to ensure that storage arrangement is recorded after fault occurs in circuit
The stable fault current flow through；
Three green light indicating circuits, are connected with corresponding relay II respectively, are used to refer to circuit normal power supply state；
Current detecting unit, input and three green light indicating member outfans are connected, and are arranged to the electric current of measurement circuitry；
Three power autonomous, constitutes charge circuit between leading-out terminal and the ground wire of the relay II being connected on correspondence respectively；Three relays
Device III, for the normal open switch of the instantaneous disconnection of timing closing, the timing closing time of relay III is more than relay I and relay II
Time delay turn-off time；The power autonomous composition discharge loop that is connected with red light indicating member by relay III, after line fault
Being that each unit is powered by red light indicating member, power autonomous have charging/discharging function, power autonomous when circuit is normal is charged,
During line fault and after relay III closes, discharge loop conducting continues power supply for current detecting unit and voltage detection unit and comes
Detection line condition；
Electrical power multiplication unit, is connected with voltage detection unit and current detecting unit outfan；
Control unit, built-in IP address information, it is connected on the outfan of electrical power multiplication unit, when circuit is normal, gathers voltage electricity
Stream and the information of power；During line fault, according to voltage and current data, calculate the distance of trouble point and this menu, should
Distance is in the range of error allowed, and this result is stored；
Power autonomous electric discharge monitoring means, is used for monitoring power autonomous discharge condition, when power autonomous transferred to electric discharge by charging after,
This unit provides signal to control unit, makes control unit no longer receive the power signal that electrical power multiplication unit provides, but only
Receive the size of voltage x current, and be processed into the information of trouble point and menu distance；
Memory I, is connected with control unit, the track data that storage collects；
Display unit, is connected on the outfan of control unit, selects LCDs, for storage data being shown；
Storage data are sent by wireless transmission control module by wireless；
Wireless receiving control module, is used for accepting the wireless signal that wireless transmission control module sends；
Processing unit, is connected on the outfan of wireless receiving control module；
Memory I I, is connected with processing unit, is used for storing line voltage distribution, the current data collected；
Power network line geographical map electronic simulation plate, is connected with processing unit, has and reception storage data and fault message is demonstrated,
And this analog board circuit is designed to geographical position and the operation that the circuit geographical position figure that circuit is actual, circuit and menu are installed
Situation can clearly be seen by power network line geographical map electronic simulation plate, and after breaking down, position of failure point and function table id all exist
Showing in power network line geographical map electronic simulation plate, the distribution that this power network line geographical map electronic simulation plate is arranged in electric company is robbed
The class of repairing and control room, in order to monitor grid operating conditions, very first time process accident in real time.
2. utilize menu as claimed in claim 1 and the method to position of failure point location thereof, it is characterized in that including following step
Rapid:
1), by menu being arranged on the secondary side of power transformation device, when circuit normally works, current detecting unit receives the three of circuit
Phase current, when circuit normally works, relay III is in open position, and green light shows that circuit is normal, and persistently gives power autonomous
Charging；
2), work as line failure, relay II wouldn't action, wait circuit re-switching, if closing a floodgate successfully, describe the problem solution
Removing, relay protection is failure to actuate；If fault does not eliminates, after unsuccessful reclosing, relay II is to increase or become according to fault current
In zero, determining to be cut off circuit by internal overcurrent switch or zero current step switch, time-lag action avoids circuit re-switching
Time；Relay III also begins to Guan Bi after the switch motion in relay II, but the delay time of relay III is more than relay
The delay time of II, power autonomous line conduction, it is achieved discharging function, green light extinguishes, and when red shows that this phase line occurs
Fault；When line fault eliminates, the instantaneous combined floodgate of relay II, green light, now relay III action, instantaneous disconnection, red
Lamp extinguishes, and power autonomous supply line disconnects, and enters charged state.
3), when circuit is properly functioning, voltage detection unit detection three-phase voltage, when there is phase fault, faulted phase voltage
Raising, relay I time delay is failure to actuate, and when disconnecting after unsuccessful reclosing, fault phase relay I disconnects, voltage detection unit event
Barrier is by power autonomous power supply；When circuit recovers normal, the instantaneous Guan Bi of relay I, cut off power autonomous loop；Other faults,
Fault phase is constant or reduces, and relay I is failure to actuate.
4), when circuit is normal, electrical power multiplication unit receives electric current and the signal of voltage detection unit input, through inner core
The algorithm that sheet sets, calculates current line power, and voltage, electric current and power data is sent to control unit；
5), when after power autonomous electric discharge, power autonomous electric discharge monitoring means sending signal to control unit, control unit will connect
The analogue signal received is converted to digital signal, and by the algorithm set, digital signal is calculated fault current and resistance, it is achieved
Calculate the function of trouble point distance.Related data stored device I inputs wireless transmission control module, is also sent to display unit；
6), radio send after control module sends signal, long-range wireless receiving control module receives signal, and signal stores
Being sent to power network line geographical map electronic simulation plate after memory I I, analog board is to demonstrate related data, it is achieved to sending
The menu of failure warning and trouble point send red light warning in analog board, now because of circuit relay protection action reason, and meeting
Faulty point sends fault alarm to multiple menus of load side, but close mains side is near trouble point, analog board
Because circuit to be fabricated to the geographical position figure of reality, so employee can determine that geographic location, trouble point and affiliated bar number, join
Electricity repairing class employee can arrive scene and find trouble point easily.
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| CN109839568A (en) * | 2019-02-25 | 2019-06-04 | 国家电网有限公司 | Transmission line malfunction diagnostic system based on zero-sequence current detection |
| CN110912118A (en) * | 2019-10-22 | 2020-03-24 | 深圳供电局有限公司 | Low-voltage branch line loss analysis method and monitoring system |
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| CN111413581A (en) * | 2020-03-19 | 2020-07-14 | 国网湖北省电力有限公司荆门供电公司 | Power distribution network fault accurate positioning method considering intelligent electric meter information |
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| CN106950458A (en) * | 2017-03-15 | 2017-07-14 | 国家电网公司 | The short circuit of low pressure uniline and disconnection detection device |
| CN107390614A (en) * | 2017-09-01 | 2017-11-24 | 泸州能源投资有限公司 | A kind of charging pile communication intelligent management system |
| CN107390614B (en) * | 2017-09-01 | 2020-02-18 | 泸州能源投资有限公司 | Fill electric pile communication intelligent management system |
| CN109839568A (en) * | 2019-02-25 | 2019-06-04 | 国家电网有限公司 | Transmission line malfunction diagnostic system based on zero-sequence current detection |
| CN110912118A (en) * | 2019-10-22 | 2020-03-24 | 深圳供电局有限公司 | Low-voltage branch line loss analysis method and monitoring system |
| CN111413581A (en) * | 2020-03-19 | 2020-07-14 | 国网湖北省电力有限公司荆门供电公司 | Power distribution network fault accurate positioning method considering intelligent electric meter information |
| CN111413581B (en) * | 2020-03-19 | 2023-08-25 | 国网湖北省电力有限公司荆门供电公司 | Power distribution network fault accurate positioning method considering intelligent ammeter information |
| CN111308152A (en) * | 2020-04-09 | 2020-06-19 | 南京南瑞继保电气有限公司 | Protection method and system compatible with different types of mutual inductors |
| CN111308152B (en) * | 2020-04-09 | 2022-08-26 | 南京南瑞继保电气有限公司 | Protection method and system compatible with different types of mutual inductors |
| CZ309411B6 (en) * | 2021-04-11 | 2022-12-07 | Mega - Měřící Energetické Aparáty, A.S. | A method of determining the section of the HV line with a short circuit in an HV network |
| CN113092943A (en) * | 2021-04-12 | 2021-07-09 | 广东电网有限责任公司阳江供电局 | Automatic change circuit simulation case |
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