CN104952235A - Power transmission line monitoring and loss reducing method - Google Patents
Power transmission line monitoring and loss reducing method Download PDFInfo
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- CN104952235A CN104952235A CN201510418242.7A CN201510418242A CN104952235A CN 104952235 A CN104952235 A CN 104952235A CN 201510418242 A CN201510418242 A CN 201510418242A CN 104952235 A CN104952235 A CN 104952235A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
Abstract
According to a power transmission line monitoring and loss reducing method, data support is provided for accurate calculation of line losses by acquiring parameters of a power transmission line; meanwhile, the loss reducing rates generated by different loss reducing measures are analyzed, the optimum loss reducing measure is selected by the adoption of a loss reduction optimizing measure, and thus optimum operation of the power transmission line is achieved while losses are reduced.
Description
Technical field
The present invention relates to a kind of technical field of Energy Saving Control of electric line, specifically, is the monitoring of a kind of transmission line of electricity and the method for falling damage.
Background technology
In electric system, all can produce electric energy loss and loss, how to manage line loss in each link of transmission of electricity, power transformation, distribution and marketing, be an important content of power supply enterprise's cost management.The demand for development power supply enterprise of market economy is centered by economic benefit, and the aim of energy-saving and emission-reduction simultaneously, what require again maximal efficiency utilizes resource, reduces energy resource consumption.
Along with the complexity gradually of electric network composition, technical difficulty and the workload of Controlling line loss and calculating are increasing.Power distribution network in the past, deficient to load data data on the one hand, power supply enterprise often selects again the observation station favourable to oneself to measure on the other hand, and the theory wire loss calculated also often differs larger with the practical line loss in circuit.And using line loss and line loss per unit as line loss analyzing performance assessment criteria, be difficult to find out affect line loss change various principal elements, weigh every reducing loss measure damage effect is fallen, thus the reducing loss measure scheme suiting power distribution network reality cannot be obtained.
Embodiment:
Based on the deficiency that prior art exists, the invention provides a kind of method that transmission line of electricity is monitored and fallen damage, method completes the collection to power distribution network information by on-line monitoring and acquisition system, have employed RS485 bus, ZIGBEE, GPRS/GSM complete between collecting unit and equipment, between collecting unit, collecting unit and the communication between main website and office terminal, on-line monitoring and acquisition system comprise power information collecting unit, equipment information collection unit, specially become collecting unit and centralized automatic meter-reading unit.
Power information collecting unit
Power information collecting unit is the system unit gathering the power information of power consumer, process and monitor in real time, realizes the function such as the automatic collection of power information, measurement loop exception monitoring, electric energy quality monitoring, electrical energy consumption analysis manages, relevant information is issued, the information interaction of intelligent power equipment.
Equipment information collection unit
Equipment information collection unit is the equipment each information point being carried out to information acquisition.The collection of electric energy meter data, data management, data double-way transmission can be realized and forward or perform the equipment of control command.
Special change collecting unit
Special change acquisition terminal is the equipment to specially becoming user power utilization information.The collection of electric energy meter data, electric energy measuring equipment operating mode and power quality monitoring can be realized, and the monitoring of client's power load and electric flux, and image data is managed and transmitted in both directions.
Centralized automatic meter-reading unit
Centralized automatic meter-reading terminal is the equipment gathered low pressure power information, comprises concentrator, collector.Concentrator refers to the data of collecting each collector or electric energy meter, and row relax of going forward side by side stores, simultaneously can and main website and equipment power information collecting unit carry out the equipment of exchanges data.Collector is the energy information for gathering multiple or single electric energy meter, and can exchange the equipment of data with concentrator.
Power information collecting unit is the core of on-line monitoring and acquisition system, power information collecting unit has coordinated the function such as load data, electric quantity data, meter reading data, power quality data, floor data, abnormal information, event log data collection with ammeter or other sensors, also to complete the exchanges data with other power information collecting units (wireless current transformer acquisition terminal etc.), and carry out data analysis in real time, then by GPRS and GSM, data are sent to monitoring main website or terminal management apparatus.
Power information collecting unit is made up of intelligent cell, wireless phone module and ZIGBEE wireless module three part.
Power information collecting unit communicates by RS485 interface or far infrared mode with between base table or sensor, realize the collection of electric energy information or abnormal information, adopt ZIGBEE communication to communicate between power information collecting unit, power information collecting unit communicates with gsm communication mode with adopting GPRS between main website, management terminal device.
Power information collecting unit is installed in batch meter near substation transformer or switch cubicle, realizes metering, gathers, the function such as abnormal information communication and logout, and in real time and main website exchange data.
By the collection accurately of the parameter information to transmission line of electricity, thus provide parameter foundation for the calculating of line loss value.
The account form of line loss value is as follows:
Power transmission line is in the line loss value of T preset time
In formula,
be respectively the equivalence value of electric current, active power, reactive power, voltage and resistance, wherein,
In formula, K, L are the curve coefficients of load curve,
be respectively the mean value of active power and reactive power;
Can draw from above
be respectively active energy and capacity of idle power;
Curve coefficients K, L are determined by the shape of load curve, and span is
Wherein
for minimum burden with power rate,
,
be respectively meritorious minimum value and meritorious maximal value;
Wherein
for minimum load or burden without work rate,
,
be respectively idle minimum value and meritorious maximal value.
The strategy that reduces the wastage is
(1) damage falls in Reasonable adjustment working voltage
The adjustment of working voltage refers to by adjustment generator voltage and load tap changer, the means such as switched capacitor and phase modifier pressure regulation on bus, on the basis ensureing quality of voltage, does appropriate adjustment to working voltage;
Loss rate is fallen:
In formula, S is the applied power of transmission line of electricity, and P is active power,
for working voltage, R is line resistance.
(2) damage falls in transmission line voltage uprating transformation
Electrical network boosting and transformation refers to that power load increases fast, cause circuit transmission capacity not or energy consumption significantly rise, reach obvious uneconomic stage and fallen by the boosting and transformation of circuit.
The loss rate of falling reducing load loss after transmission line voltage uprating is
(3) restringing cross section
When carrying load certain, restringing interface, reduces the effect that conductor resistance can reach wastage reducing and energy saving;
The loss rate of falling reduced the wastage after thread-changing is:
In formula,
for before thread-changing conductor resistance (
);
for after thread-changing conductor resistance (
).
(4) circuit presses economic current density operation
Economic current density is formulated according to factors such as economize on electricity investment, annual operating cost and non-ferrous metals, carries out saving energy and decreasing loss by selecting the economic current density run;
The loss rate of falling that after wire runs by economic current, loss reduces is
In formula,
for continuous service electric current (A),
for economical operation electric current (A).
In addition, following measures can also be specifically taked to improve circuit to reduce line loss:
(1) divide stream load, reduce the current density of circuit.Transformer station is utilized to remain outgoing line interval. the high circuit of, loss large to load carries out shunting transformation, reduces line load by the mode increasing circuit outlet, thus reduction line loss;
(2) Load adjustment center, optimizes electric network composition.Layout for the power supply existed in power distribution network few, the problem that radius of electricity supply is long, takes the method for building new website and the old station of transformation to shorten radius of electricity supply, then takes the mode of low capacity, densely covered point, short radius to reach the object of economize on electricity in countryside low-voltage electric distribution network;
(3) transform irrational configuration, eliminate and roundaboutly send phenomenon, reduce circuitous, shorten line length;
(3) to long operational time, wire diameter is thin, loss the is high heavy in section wire of track replacement;
(4) transformer should by economical operation curve motion, and that is furnished with that two transformers connected in parallel run will to put into operation one or two transformers according to load condition, and also in good time, parallel off runs;
(5) load tapchanging transformer, in good time Reasonable adjustment voltage, makes voltage often remain in qualified scope;
(6) more new peak damages transformer, uses energy saving transformer.Reasonable selection and adjustment capacity of distribution transform, improve distribution transforming average load rate;
Reduce line loss per unit fall damage flow process as follows:
The following step can be taked to draw and to fall damage Optimized Measures;
(1) line loss per unit under present case is calculated;
(2) do you judge that now line loss per unit meets the requirement of score loss rate AG%? if so, then (6) are performed; Otherwise, carry out (3);
(3) to calculate under present case all kinds of fall damage strategy loss rate is fallen
.If
maximum, then choose in corresponding reducing loss measure, put into reducing loss measure set M;
(4) line loss per unit after the reducing loss measure taked in set M is calculated;
(5) return (2);
(6) calculating the total expenses C falling damage Optimized Measures taking to gather in M, is exactly fall damage Optimized Measures in set M;
(7) judge whether total expenses C is greater than costs on the higher scale Cmax, if so, perform step (8), if not, perform step (10);
(8) sub-load is transferred on All other routes or newly-built circuit; Shorten radius of electricity supply, load i is transferred to the quality index of All other routes
, and judge quality index
whether in setting range, in this way, perform step (9), as no, out of service and report to the police
,
Wherein
represent the line loss per unit that after being shifted from circuit I by load i, circuit I reduces,
represent the line loss per unit that after load i is transferred to circuit II, circuit II increases;
(9) after execution of step (8), step (1)-(7) are re-executed;
(10) out of service;
By the parameter acquisition to transmission line of electricity, thus provide data supporting for the accurate calculating of line loss, meanwhile, what analyze that different reducing loss measure produces falls loss rate, and adopt to fall and damage Optimized Measures and select best reducing loss measure, thus while falling damage, reach the optimized running of transmission line of electricity.
Embodiment:
As shown in Figure 1, a kind of transmission line of electricity is monitored and is fallen the method for damage, method completes the collection to power distribution network information by on-line monitoring and acquisition system, have employed RS485 bus, ZIGBEE, GPRS/GSM complete between collecting unit and equipment, between collecting unit, collecting unit and the communication between main website and office terminal, on-line monitoring and acquisition system comprise power information collecting unit, equipment information collection unit, specially become collecting unit and centralized automatic meter-reading unit.
Power information collecting unit
Power information collecting unit is the system unit gathering the power information of power consumer, process and monitor in real time, realizes the function such as the automatic collection of power information, measurement loop exception monitoring, electric energy quality monitoring, electrical energy consumption analysis manages, relevant information is issued, the information interaction of intelligent power equipment.
Equipment information collection unit
Equipment information collection unit is the equipment each information point being carried out to information acquisition.The collection of electric energy meter data, data management, data double-way transmission can be realized and forward or perform the equipment of control command.
Special change collecting unit
Special change acquisition terminal is the equipment to specially becoming user power utilization information.The collection of electric energy meter data, electric energy measuring equipment operating mode and power quality monitoring can be realized, and the monitoring of client's power load and electric flux, and image data is managed and transmitted in both directions.
Centralized automatic meter-reading unit
Centralized automatic meter-reading terminal is the equipment gathered low pressure power information, comprises concentrator, collector.Concentrator refers to the data of collecting each collector or electric energy meter, and row relax of going forward side by side stores, simultaneously can and main website and equipment power information collecting unit carry out the equipment of exchanges data.Collector is the energy information for gathering multiple or single electric energy meter, and can exchange the equipment of data with concentrator.
Power information collecting unit is the core of on-line monitoring and acquisition system, power information collecting unit has coordinated the function such as load data, electric quantity data, meter reading data, power quality data, floor data, abnormal information, event log data collection with ammeter or other sensors, also to complete the exchanges data with other power information collecting units (wireless current transformer acquisition terminal etc.), and carry out data analysis in real time, then by GPRS and GSM, data are sent to monitoring main website or terminal management apparatus.
Power information collecting unit is made up of intelligent cell, wireless phone module and ZIGBEE wireless module three part.
Power information collecting unit communicates by RS485 interface or far infrared mode with between base table or sensor, realize the collection of electric energy information or abnormal information, adopt ZIGBEE communication to communicate between power information collecting unit, power information collecting unit communicates with gsm communication mode with adopting GPRS between main website, management terminal device.
Power information collecting unit is installed in batch meter near substation transformer or switch cubicle, realizes metering, gathers, the function such as abnormal information communication and logout, and in real time and main website exchange data.
By the collection accurately of the parameter information to transmission line of electricity, thus provide parameter foundation for the calculating of line loss value.
The account form of line loss value is as follows:
Power transmission line is in the line loss value of T preset time
In formula,
be respectively the equivalence value of electric current, active power, reactive power, voltage and resistance, wherein,
In formula, K, L are the curve coefficients of load curve,
be respectively the mean value of active power and reactive power
Can draw from above:
be respectively active energy and capacity of idle power;
Curve coefficients K, L are determined by the shape of load curve, and span is:
Wherein
for minimum burden with power rate,
,
be respectively meritorious minimum value and meritorious maximal value:
Wherein
for minimum load or burden without work rate,
,
be respectively idle minimum value and meritorious maximal value.
The strategy that reduces the wastage is
(1) damage falls in Reasonable adjustment working voltage
The adjustment of working voltage refers to by adjustment generator voltage and load tap changer, the means such as switched capacitor and phase modifier pressure regulation on bus, on the basis ensureing quality of voltage, does appropriate adjustment to working voltage.
Loss rate is fallen:
In formula, S is the applied power of transmission line of electricity, and P is active power,
for working voltage, R is line resistance,
(2) damage falls in transmission line voltage uprating transformation
Electrical network boosting and transformation refers to that power load increases fast, cause circuit transmission capacity not or energy consumption significantly rise, reach obvious uneconomic stage and undertaken falling damage by the boosting and transformation of circuit,
The loss rate of falling reducing load loss after transmission line voltage uprating is:
(3) restringing cross section
When carrying load certain, restringing interface, reduces the effect that conductor resistance can reach wastage reducing and energy saving
The loss rate of falling reduced the wastage after thread-changing is:
In formula,
for before thread-changing conductor resistance (
);
for after thread-changing conductor resistance (
),
(4) circuit presses economic current density operation
Economic current density is formulated according to factors such as economize on electricity investment, annual operating cost and non-ferrous metals, by selecting the economic current density run to carry out saving energy and decreasing loss,
The loss rate of falling that after wire runs by economic current, loss reduces is
In formula,
for continuous service electric current (A),
for economical operation electric current (A);
In addition, following measures can also be specifically taked to improve circuit to reduce line loss:
(1) divide stream load, reduce the current density of circuit.Transformer station is utilized to remain outgoing line interval. the high circuit of, loss large to load carries out shunting transformation, reduces line load by the mode increasing circuit outlet, thus reduction line loss;
(2) Load adjustment center, optimizes electric network composition.Layout for the power supply existed in power distribution network few, the problem that radius of electricity supply is long, takes the method for building new website and the old station of transformation to shorten radius of electricity supply, then takes the mode of low capacity, densely covered point, short radius to reach the object of economize on electricity in countryside low-voltage electric distribution network;
(3) transform irrational configuration, eliminate and roundaboutly send phenomenon, reduce circuitous, shorten line length;
(3) to long operational time, wire diameter is thin, loss the is high heavy in section wire of track replacement;
(4) transformer should by economical operation curve motion, and that is furnished with that two transformers connected in parallel run will to put into operation one or two transformers according to load condition, and also in good time, parallel off runs;
(5) load tapchanging transformer, in good time Reasonable adjustment voltage, makes voltage often remain in qualified scope;
(6) more new peak damages transformer, uses energy saving transformer.Reasonable selection and adjustment capacity of distribution transform, improve distribution transforming average load rate;
Reduce line loss per unit fall damage flow process as follows;
The following step can be taked to draw and to fall damage Optimized Measures:
(1) line loss per unit under present case is calculated;
(2) do you judge that now line loss per unit meets the requirement of score loss rate AG%? if so, then (6) are performed; Otherwise, carry out (3);
(3) to calculate under present case all kinds of fall damage strategy loss rate is fallen
.If
maximum, then choose in corresponding reducing loss measure, put into reducing loss measure set M;
(4) line loss per unit after the reducing loss measure taked in set M is calculated;
(5) return (2);
(6) calculating the total expenses C falling damage Optimized Measures taking to gather in M, is exactly fall damage Optimized Measures in set M;
(7) judge whether total expenses C is greater than costs on the higher scale Cmax, if so, perform step (8), if not, perform step (10);
(8) sub-load is transferred on All other routes or newly-built circuit; Shorten radius of electricity supply, load i is transferred to the quality index of All other routes
, and judge quality index
whether in setting range, in this way, perform step (9), as no, out of service and report to the police,
,
Wherein
represent the line loss per unit that after being shifted from circuit I by load i, circuit I reduces,
represent the line loss per unit that after load i is transferred to circuit II, circuit II increases;
(9) after execution of step (8), step (1)-(7) are re-executed;
(10) out of service;
By the parameter acquisition to transmission line of electricity, thus provide data supporting for the accurate calculating of line loss, meanwhile, what analyze that different reducing loss measure produces falls loss rate, and adopt to fall and damage Optimized Measures and select best reducing loss measure, thus while falling damage, reach the optimized running of transmission line of electricity.
The foregoing is only of the present invention and be preferably not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of transmission line of electricity monitoring and the method for falling damage.
Claims (6)
1. a transmission line of electricity is monitored and falls the method for damage, it is characterized in that, the collection to power distribution network information is completed by on-line monitoring and acquisition system, on-line monitoring and acquisition system comprise power information collecting unit, equipment information collection unit, specially become collecting unit and centralized automatic meter-reading unit, have employed RS485 bus respectively, ZIGBEE, GPRS/GSM complete between collecting unit and equipment, between collecting unit, collecting unit and the communication between main website and office terminal.
2. transmission line of electricity as claimed in claim 1 is monitored and is fallen the method for damage, it is characterized in that, the power information of power information collecting unit to power consumer gathers, process and in real time monitoring, realize the automatic collection of power information, measurement loop exception monitoring, electric energy quality monitoring, electrical energy consumption analysis manages, relevant information is issued, the information interaction of intelligent power equipment, equipment information collection unit carries out information acquisition to each information point, realize the collection of electric energy meter data, data management, data double-way transmits and forwards or perform control command, special change acquisition terminal is to specially becoming user power utilization information, realize the collection of electric energy meter data, electric energy measuring equipment operating mode and power quality monitoring, and the monitoring of client's power load and electric flux, and image data is managed and transmitted in both directions,
Centralized automatic meter-reading terminal gathers low pressure power information, comprise concentrator, collector, the data of each collector or electric energy meter collected by concentrator, row relax of going forward side by side stores, simultaneously and main website and equipment power information collecting unit carry out exchanges data, collector gathers energy information that is multiple or single electric energy meter, exchanges data with concentrator;
Power information collecting unit has coordinated load data, electric quantity data, meter reading data, power quality data, floor data, abnormal information, event log data collection with ammeter or other sensors, and complete the exchanges data with other power information collecting units, and carry out data analysis in real time, then by GPRS and GSM, data are sent to monitoring main website or terminal management apparatus.
3. transmission line of electricity as claimed in claim 2 is monitored and is fallen the method for damage, and it is characterized in that, the account form of line loss value is as follows:
Power transmission line is in the line loss value of T preset time
In formula,
be respectively the equivalence value of electric current, active power, reactive power, voltage and resistance.
4. transmission line of electricity as claimed in claim 3 is monitored and is fallen the method for damage, it is characterized in that,
, in formula, K, L are the curve coefficients of load curve,
be respectively the mean value of active power and reactive power
Can draw from above
be respectively active energy and capacity of idle power;
Curve coefficients K, L are determined by the shape of load curve, and span is:
Wherein
for minimum burden with power rate,
,
be respectively meritorious minimum value and meritorious maximal value;
Wherein
for minimum load or burden without work rate,
,
be respectively idle minimum value and meritorious maximal value.
5. transmission line of electricity as claimed in claim 4 is monitored and is fallen the method for damage, and it is characterized in that, the strategy that reduces the wastage is
(1) damage falls in Reasonable adjustment working voltage
The loss rate of falling of adjust operation voltage is
In formula, S is the applied power of transmission line of electricity, and P is active power,
for working voltage, R is line resistance;
(2) damage falls in transmission line voltage uprating transformation
The loss rate of falling reducing load loss after transmission line voltage uprating is:
(3) restringing cross section
The loss rate of falling reduced the wastage after thread-changing is:
In formula,
for before thread-changing conductor resistance (
);
for after thread-changing conductor resistance (
);
(4) circuit presses economic current density operation
The loss rate of falling that after wire runs by economic current, loss reduces is:
In formula,
for continuous service electric current (A),
for economical operation electric current (A).
6. transmission line of electricity monitoring as claimed in claim 5 and fall the method for damage, is characterized in that, that reduces line loss per unit falls that to damage flow process as follows:
The following step can be taked to draw and to fall damage Optimized Measures:
(1) line loss per unit under present case is calculated;
(2) do you judge that now line loss per unit meets the requirement of score loss rate? if so, step (6) is then performed; Otherwise, carry out step (3);
(3) to calculate under present case all kinds of fall damage strategy loss rate is fallen
if,
maximum, then choose in corresponding reducing loss measure and put into reducing loss measure set M;
(4) line loss per unit after the reducing loss measure taked in set M is calculated;
(5) return (2);
(6) calculating the total expenses C falling damage Optimized Measures taking to gather in M, is exactly fall damage Optimized Measures in set M;
(7) judge whether total expenses C is greater than costs on the higher scale Cmax, if so, perform step (8), if not, perform step (10),
(8) sub-load is transferred on All other routes or newly-built circuit; Shorten radius of electricity supply, calculate quality index load i being transferred to All other routes
, and judge quality index
whether in setting range, in this way, perform step (9), as no, out of service and report to the police;
,
Wherein
represent the line loss per unit that after being shifted from circuit I by load i, circuit I reduces,
represent the line loss per unit that after load i is transferred to circuit II, circuit II increases;
(9) after execution of step (8), step (1)-(7) are re-executed;
(10) out of service.
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| CN105743108A (en) * | 2016-01-31 | 2016-07-06 | 孙雪 | 10kV low-voltage intelligent power distribution network system with three-phase unbalanced monitoring function |
| CN106093558A (en) * | 2016-05-31 | 2016-11-09 | 武汉大学 | Electric energy acquisition terminal ERTU scheme for the metering of flexible direct current power transmission system efficiency |
| CN107359703A (en) * | 2017-08-29 | 2017-11-17 | 安徽三和电力技术有限公司 | Intelligent electric power system monitoring and remote power display system |
| CN111487461A (en) * | 2020-04-22 | 2020-08-04 | 国网河北省电力有限公司沧州供电分公司 | Line loss monitoring system |
| CN117175586A (en) * | 2023-11-03 | 2023-12-05 | 国网山东省电力公司菏泽供电公司 | Multi-scene energy-saving and loss-reducing processing system for medium-voltage line |
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| CN105743108B (en) * | 2016-01-31 | 2018-06-26 | 科誉德电气（苏州）有限公司 | A kind of 10kV low-voltage intelligent distribution network systems with three-phase imbalance monitoring function |
| CN105717398A (en) * | 2016-04-12 | 2016-06-29 | 国家电网公司 | Power distribution network power loss monitor and monitoring method thereof |
| CN106093558A (en) * | 2016-05-31 | 2016-11-09 | 武汉大学 | Electric energy acquisition terminal ERTU scheme for the metering of flexible direct current power transmission system efficiency |
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