CN112488494A - Urban power grid planning method considering coordination of main network and distribution network - Google Patents

Abstract

The application discloses a city power grid planning method considering coordination of a main network and a distribution network, wherein the planning method comprises the following steps of evaluating the current situation of the distribution network; the early-stage survey comprises the steps of analyzing the urban power grid to be planned before planning the urban power grid, and clearly mastering the arrangement condition of the power grid in an area to be planned, such as the total amount of required electric quantity, the load condition, the load distribution condition and the like; making a target; arranging power grid power supply points; selecting points of a substation, selecting the construction position of the substation of an urban power supply system according to the actual condition of a city, determining the laying path of a power supply line, and determining the construction period of engineering construction; the requirements of construction and modification projects of the urban power grid on automation and the like are determined; and compiling an urban power grid planning specification and drawing an urban power grid planning drawing. The planning method provided by the application is comprehensive, and the power grids of all areas and levels can be well coordinated through early-stage investigation and medium-stage planning.

Description

Urban power grid planning method considering coordination of main network and distribution network

Technical Field

The application relates to a power grid planning method, in particular to an urban power grid planning method considering coordination of a main network and a distribution network.

Background

The urban power distribution network is directly oriented to vast power consumers and is a link for the connection of power supply enterprises and the power consumers. With the continuous development of power distribution network equipment of a power system in China, the country requires high voltage to directly enter a load center in urban and rural power grid construction and transformation to form a power supply mode of high-voltage power receiving, transformer voltage reduction and low-voltage power distribution.

The traditional power grid planning method is one-sidedly, most of the power grids are not subjected to early-stage investigation before planning, and the relations between each region and each level of power grid cannot be well coordinated. Therefore, a city power grid planning method considering coordination of the main network and the distribution network is provided for solving the problems.

Disclosure of Invention

A city power grid planning method considering coordination of a main network and a distribution network comprises the following steps:

step 1, evaluating the current situation of the power distribution network, analyzing the actual situation of the power distribution network in a district of the current situation, objectively evaluating existing problems according to the guide of planning and designing technology of the power distribution network, searching weak links, providing directions and bases for subsequent power grid construction, and guiding recent planning and construction;

step 2, early-stage investigation, namely, before planning the urban power grid, analyzing the urban power grid to be planned, and clearly mastering the arrangement condition of the power grid in the area to be planned, such as the total amount of required electric quantity, the load condition, the load distribution condition and the like;

step 3, setting targets, namely setting all levels of planning targets of the area to be subjected to power grid planning, determining a power grid planning structure, and applying standardized power supply facilities;

step 4, arranging power grid power supply points, keeping power balance and providing arrangement requirements for the power supply points of the urban power grid;

step 5, selecting points of the substation, selecting the construction position of the substation of the urban power supply system according to the actual situation of the city, determining the laying path of a power supply line, and determining the construction period of the project;

step 6, determining the requirements of construction and modification projects of the urban power grid on automation and other aspects;

and 7, compiling an urban power grid planning specification and drawing an urban power grid planning drawing.

Further, the current situation assessment in the step (1) mainly comprises power supply condition, high and medium voltage grid equipment level, grid structure, power supply capacity, cable channel construction and available condition analysis.

Furthermore, the power load prediction is synchronously performed in the early inspection process in the step (2), from the aspects of economic and social development, the future power load development situation of the district is analyzed, a basis and a determined target are provided for the construction development of the district power distribution network, and the near-middle-term and long-term load prediction is performed on the basis of load investigation according to the economic and social development and the urban general planning.

Further, when the target is established in the step (3), for the condition that the city is unstable and unbalanced in the planning process, the investigation on the electricity consumption and electricity utilization indexes of different areas of the city in advance is increased, corresponding power distribution grid structure is established according to the characteristics of various areas, the layout is made on the whole, meanwhile, the communication with main decision-making personnel of the city is enhanced, the detailed condition of the further planning of the city is known, and the conflict between the site selection and the city planning is avoided.

Further, several principles need to be considered when selecting the dots in step (4):

the method is convenient to be in mutual contact with a power supply or other transformer substations, and meets the requirements of overall layout and urban network development;

when the position of the transformer substation is selected, the transformer substation should be close to a load center as much as possible, and after the consent of relevant planning departments, the setting of the transformer substation and the planning of the power distribution network are carried out on the premise of not damaging the environment;

when a transformer substation is selected, the environment of a peripheral cell and the power supply condition need to be fully known so as to facilitate future maintenance and management;

and fourthly, the design of the transformer substation should save land as much as possible, and the land area should be determined according to the capacity wiring of the transformer substation and the type selection of equipment.

Further, in the step (4), the distribution of the grid points needs to follow the principle of multiple points and wide range, the path and the environment around the power supply range are known and analyzed in detail, the selection of the path and the setting of the transformer substation play a key role in judging whether the power supply radius is suitable or not, and when the setting is carried out, the setting is coordinated with the economic development planning and the construction planning of the city, the division of the power supply area is carried out, the wire section and the power distribution capacity are determined, the scheme is drawn up, and the reasonable layout of the power distribution grid points is realized.

Further, the following principle needs to be followed when the power transformation site selection in the step (5):

A. access to the power supply side, in particular to the total step-down substation and the high-voltage distribution substation of the plant;

B. the load center is approached as much as possible, so that the electric energy loss, the voltage loss and the non-ferrous metal consumption of a power distribution system are reduced;

C. the device is not suitable for being arranged in places with much dust or corrosive gas, and is not arranged on the downwind side of a pollution source when the device cannot be far away;

D. the inlet and outlet are convenient, and particularly, the overhead inlet and outlet wires are convenient;

E. the distribution station is generally an independent building and can also be attached to a factory building or a building with larger load together with a carried 10(6) KV substation;

F. the equipment is convenient to transport, and particularly the transportation of a power transformer and a high-low voltage complete set of power distribution equipment needs to be considered;

G. the water-saving device is not arranged right below a toilet, a bathroom or other places where water is often accumulated and is not suitable to be adjacent to the places;

H. the device should not be installed in places with severe vibration or high temperature, and should be protected from vibration and heat if the device cannot be avoided.

Further, the automation construction and energy saving measures for the power distribution network in the step 6 include the following steps:

1) setting an automatic switch project; in order to realize the automatic function of the power distribution network, various switch automation functions are configured according to the characteristics of a power supply area and the management requirement of the operation of a power grid system;

firstly, a cable line switch and a ring network switch are provided, a branch switch is arranged on the cable line, and a function of one remote or two remote is configured according to the switch; the looped network line should be configured with three remote functions, so that when a certain section of the looped network line breaks down, the looped network line can be automatically positioned and a fault area can be automatically isolated, the normal operation of power supply of a non-fault area is ensured, and the power failure time of the looped network line is shortened;

secondly, an automatic switching function is set for the overhead line, an automatic setting of a local switching-on and switching-off operation function needs to be set, and the two remote functions are carried out simultaneously, so that the monitoring of each network point by a master station system is realized;

setting a switching function of an overhead branch line, wherein the setting of an automatic system needs a protection function and needs to be configured with two remote functions, and when one branch fails, the failed line can be immediately cut off, so that the normal power supply of a main line is ensured;

2) energy-saving measures in power distribution network planning;

firstly, the running voltage is effectively adjusted, and the voltage running is adjusted to reduce active loss under the condition of ensuring that the voltage quality is not influenced by adjusting a tap joint of a transformer and a power capacitor on a bus, so that the running voltage loss is reduced, and the energy-saving power distribution effect is realized;

secondly, line loss target management is carried out; the power supply company executes a line loss target management responsibility system on subordinate management departments, signs responsibility books, performs branch, partial pressure and branch assessment, and brings the responsibility books into an internal economic responsibility system, so that the working enthusiasm of workers is mobilized;

balancing three-phase load; if the three-phase load is unbalanced, the loss of a line and a distribution transformer can be increased;

fourthly, various energy-saving transformers are used, so that the no-load loss of the transformers is obviously reduced;

line maintenance is enhanced, and leakage is prevented; the method mainly comprises the steps of regularly inspecting the line, timely finding and processing line leakage and connector overheating accidents, reducing loss caused by overlarge connector resistance, timely replacing unqualified insulators, frequently trimming branches of trees along the power line, and regularly cleaning a transformer, a breaker, an insulating porcelain piece and the like;

sixthly, reasonably arranging maintenance and improving the maintenance quality; when the power grid operates according to a normal operation mode, the power grid is generally safe and economical, and when equipment is overhauled, the normal operation mode is damaged, so that the line loss is increased; therefore, the equipment maintenance needs to be planned, the maintenance quality needs to be improved, the temporary maintenance needs to be reduced, the maintenance time needs to be shortened, and the live maintenance needs to be popularized;

and seventhly, the new technology, new equipment, new material and new process are popularized and applied, and the electric energy loss is reduced.

The beneficial effect of this application is: the application provides a city power grid planning method considering coordination of a main network and a distribution network.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic view of a flow structure of a method according to an embodiment of the present application.

In the figure: 1. the handle, 2, the sliding sleeve, 3, the installing ring, 4, the inner tube, 5, the negative pole switching post, 6, the ceramic guard shield, 7, the current conducting plate, 8, resistance heating wire, 9, the negative pole inserted sheet, 10, the insulating pad, 11, PTC thermistor screening glass, 12, the positive pole inserted sheet, 13, the positive pole line preforming, 14, the negative pole spliced pole, 15, the negative pole switch-on post, 16, the bolt post, 17, the wiring insulating post, 18, connect the electric wire, 19, LED lamp pearl, 20, the spring, 21, bimetallic strip, 22, the clamp plate, 2201, the push rod, 2202, the guide bar, 2203, the montant, 2204, insulating baffle, 2205, the axle sleeve, 23, connect the electricity shell fragment.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Examples

Referring to fig. 1, a method for planning an urban power grid in consideration of coordination of a main network and a distribution network includes the following steps:

step 1, evaluating the current situation of the power distribution network, analyzing the actual situation of the power distribution network in a district of the current situation, objectively evaluating existing problems according to the guide of planning and designing technology of the power distribution network, searching weak links, providing directions and bases for subsequent power grid construction, and guiding recent planning and construction;

step 2, early-stage investigation, namely, before planning the urban power grid, analyzing the urban power grid to be planned, and clearly mastering the arrangement condition of the power grid in the area to be planned, such as the total amount of required electric quantity, the load condition, the load distribution condition and the like;

step 3, setting targets, namely setting all levels of planning targets of the area to be subjected to power grid planning, determining a power grid planning structure, and applying standardized power supply facilities;

step 4, arranging power grid power supply points, keeping power balance and providing arrangement requirements for the power supply points of the urban power grid;

step 5, selecting points of the substation, selecting the construction position of the substation of the urban power supply system according to the actual situation of the city, determining the laying path of a power supply line, and determining the construction period of the project;

step 6, determining the requirements of construction and modification projects of the urban power grid on automation and other aspects;

and 7, compiling an urban power grid planning specification and drawing an urban power grid planning drawing.

Further, the current situation assessment in the step (1) mainly comprises power supply condition, high and medium voltage grid equipment level, grid structure, power supply capacity, cable channel construction and available condition analysis.

Furthermore, the power load prediction is synchronously performed in the early inspection process in the step (2), from the aspects of economic and social development, the future power load development situation of the district is analyzed, a basis and a determined target are provided for the construction development of the district power distribution network, and the near-middle-term and long-term load prediction is performed on the basis of load investigation according to the economic and social development and the urban general planning.

Further, when the target is established in the step (3), for the condition that the city is unstable and unbalanced in the planning process, the investigation on the electricity consumption and electricity utilization indexes of different areas of the city in advance is increased, corresponding power distribution grid structure is established according to the characteristics of various areas, the layout is made on the whole, meanwhile, the communication with main decision-making personnel of the city is enhanced, the detailed condition of the further planning of the city is known, and the conflict between the site selection and the city planning is avoided.

Further, several principles need to be considered when selecting the dots in step (4):

the method is convenient to be in mutual contact with a power supply or other transformer substations, and meets the requirements of overall layout and urban network development;

when the position of the transformer substation is selected, the transformer substation should be close to a load center as much as possible, and after the consent of relevant planning departments, the setting of the transformer substation and the planning of the power distribution network are carried out on the premise of not damaging the environment;

when a transformer substation is selected, the environment of a peripheral cell and the power supply condition need to be fully known so as to facilitate future maintenance and management;

and fourthly, the design of the transformer substation should save land as much as possible, and the land area should be determined according to the capacity wiring of the transformer substation and the type selection of equipment.

Further, in the step (4), the distribution of the grid points needs to follow the principle of multiple points and wide range, the path and the environment around the power supply range are known and analyzed in detail, the selection of the path and the setting of the transformer substation play a key role in judging whether the power supply radius is suitable or not, and when the setting is carried out, the setting is coordinated with the economic development planning and the construction planning of the city, the division of the power supply area is carried out, the wire section and the power distribution capacity are determined, the scheme is drawn up, and the reasonable layout of the power distribution grid points is realized.

Further, the following principle needs to be followed when the power transformation site selection in the step (5):

A. access to the power supply side, in particular to the total step-down substation and the high-voltage distribution substation of the plant;

B. the load center is approached as much as possible, so that the electric energy loss, the voltage loss and the non-ferrous metal consumption of a power distribution system are reduced;

C. the device is not suitable for being arranged in places with much dust or corrosive gas, and is not arranged on the downwind side of a pollution source when the device cannot be far away;

D. the inlet and outlet are convenient, and particularly, the overhead inlet and outlet wires are convenient;

E. the distribution station is generally an independent building and can also be attached to a factory building or a building with larger load together with a carried 10(6) KV substation;

F. the equipment is convenient to transport, and particularly the transportation of a power transformer and a high-low voltage complete set of power distribution equipment needs to be considered;

G. the water-saving device is not arranged right below a toilet, a bathroom or other places where water is often accumulated and is not suitable to be adjacent to the places;

H. the device should not be installed in places with severe vibration or high temperature, and should be protected from vibration and heat if the device cannot be avoided.

Further, the automation construction and energy saving measures for the power distribution network in the step 6 include the following steps:

1) setting an automatic switch project; in order to realize the automatic function of the power distribution network, various switch automation functions are configured according to the characteristics of a power supply area and the management requirement of the operation of a power grid system;

firstly, a cable line switch and a ring network switch are provided, a branch switch is arranged on the cable line, and a function of one remote or two remote is configured according to the switch; the looped network line should be configured with three remote functions, so that when a certain section of the looped network line breaks down, the looped network line can be automatically positioned and a fault area can be automatically isolated, the normal operation of power supply of a non-fault area is ensured, and the power failure time of the looped network line is shortened;

secondly, an automatic switching function is set for the overhead line, an automatic setting of a local switching-on and switching-off operation function needs to be set, and the two remote functions are carried out simultaneously, so that the monitoring of each network point by a master station system is realized;

setting a switching function of an overhead branch line, wherein the setting of an automatic system needs a protection function and needs to be configured with two remote functions, and when one branch fails, the failed line can be immediately cut off, so that the normal power supply of a main line is ensured;

2) energy-saving measures in power distribution network planning;

firstly, the running voltage is effectively adjusted, and the voltage running is adjusted to reduce active loss under the condition of ensuring that the voltage quality is not influenced by adjusting a tap joint of a transformer and a power capacitor on a bus, so that the running voltage loss is reduced, and the energy-saving power distribution effect is realized;

secondly, line loss target management is carried out; the power supply company executes a line loss target management responsibility system on subordinate management departments, signs responsibility books, performs branch, partial pressure and branch assessment, and brings the responsibility books into an internal economic responsibility system, so that the working enthusiasm of workers is mobilized;

balancing three-phase load; if the three-phase load is unbalanced, the loss of a line and a distribution transformer can be increased;

fourthly, various energy-saving transformers are used, so that the no-load loss of the transformers is obviously reduced;

line maintenance is enhanced, and leakage is prevented; the method mainly comprises the steps of regularly inspecting the line, timely finding and processing line leakage and connector overheating accidents, reducing loss caused by overlarge connector resistance, timely replacing unqualified insulators, frequently trimming branches of trees along the power line, and regularly cleaning a transformer, a breaker, an insulating porcelain piece and the like;

sixthly, reasonably arranging maintenance and improving the maintenance quality; when the power grid operates according to a normal operation mode, the power grid is generally safe and economical, and when equipment is overhauled, the normal operation mode is damaged, so that the line loss is increased; therefore, the equipment maintenance needs to be planned, the maintenance quality needs to be improved, the temporary maintenance needs to be reduced, the maintenance time needs to be shortened, and the live maintenance needs to be popularized;

and seventhly, the new technology, new equipment, new material and new process are popularized and applied, and the electric energy loss is reduced.

The application has the advantages that:

the planning method provided by the application is comprehensive, and the power grids of all areas and levels can be well coordinated through early-stage investigation and medium-stage planning.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (8)

1. A city power grid planning method considering coordination of a main network and a distribution network is characterized in that: the planning method comprises the following steps:

step 1, evaluating the current situation of the power distribution network, analyzing the actual situation of the power distribution network in a district of the current situation, objectively evaluating existing problems according to the guide of planning and designing technology of the power distribution network, searching weak links, providing directions and bases for subsequent power grid construction, and guiding recent planning and construction;

step 2, early-stage investigation, namely, before planning the urban power grid, analyzing the urban power grid to be planned, and clearly mastering the arrangement condition of the power grid in the area to be planned, such as the total amount of required electric quantity, the load condition, the load distribution condition and the like;

step 3, setting targets, namely setting all levels of planning targets of the area to be subjected to power grid planning, determining a power grid planning structure, and applying standardized power supply facilities;

step 4, arranging power grid power supply points, keeping power balance and providing arrangement requirements for the power supply points of the urban power grid;

step 5, selecting points of the substation, selecting the construction position of the substation of the urban power supply system according to the actual situation of the city, determining the laying path of a power supply line, and determining the construction period of the project;

step 6, determining the requirements of construction and modification projects of the urban power grid on automation and other aspects;

and 7, compiling an urban power grid planning specification and drawing an urban power grid planning drawing.

2. The urban power grid planning method considering coordination of the main network and the distribution network of claim 1, wherein: the current situation assessment in the step (1) mainly comprises power supply condition, high and medium voltage grid equipment level, grid structure, power supply capacity, cable channel construction and available condition analysis.

3. The urban power grid planning method considering coordination of the main network and the distribution network of claim 1, wherein: and (3) synchronously predicting the power load in the early inspection process in the step (2), analyzing the future power load development condition of the district from the viewpoint of economic and social development, providing basis and determining target for the construction development of the district power distribution network, and predicting the near-middle-term and long-term loads on the basis of load investigation according to the economic and social development and the urban general planning.

4. The urban power grid planning method considering coordination of the main network and the distribution network of claim 1, wherein: when the target is established in the step (3), aiming at the condition that the city is unstable and unbalanced in the planning process, the investigation on the electricity consumption and the electricity utilization indexes of different areas of the city in advance is increased, the corresponding power distribution grid structure is made according to the characteristics of various areas, the layout is made on the whole, meanwhile, the communication with main decision-making personnel of the city is enhanced, the detailed condition of the further planning of the city is known, and the conflict between the site selection and the city planning is avoided.

5. The urban power grid planning method considering coordination of the main network and the distribution network of claim 1, wherein: the following principles need to be considered when selecting the dots in step (4):

the method is convenient to be in mutual contact with a power supply or other transformer substations, and meets the requirements of overall layout and urban network development;

when the position of the transformer substation is selected, the transformer substation should be close to a load center as much as possible, and after the consent of relevant planning departments, the setting of the transformer substation and the planning of the power distribution network are carried out on the premise of not damaging the environment;

when a transformer substation is selected, the environment of a peripheral cell and the power supply condition need to be fully known so as to facilitate future maintenance and management;

and fourthly, the design of the transformer substation should save land as much as possible, and the land area should be determined according to the capacity wiring of the transformer substation and the type selection of equipment.

6. The urban power grid planning method considering coordination of the main network and the distribution network of claim 1, wherein: in the step (4), the distribution of the network points needs to follow the principle of multiple points and wide range, the paths and the environment around the power supply range are known and analyzed in detail, the selection of the paths and the setting of the transformer substation play a key role in judging whether the power supply radius is suitable or not, and when the power supply radius is set, the power supply radius is coordinated with the economic development planning and the construction planning of the city, the division of the power supply area is carried out, the wire section and the power distribution capacity are determined, the scheme is drawn up, and the reasonable layout of the power distribution network points is realized.

7. The urban power grid planning method considering coordination of the main network and the distribution network of claim 1, wherein: when the power transformation site selection in the step (5) is carried out, the following principle needs to be followed:

A. access to the power supply side, in particular to the total step-down substation and the high-voltage distribution substation of the plant;

B. the load center is approached as much as possible, so that the electric energy loss, the voltage loss and the non-ferrous metal consumption of a power distribution system are reduced;

C. the device is not suitable for being arranged in places with much dust or corrosive gas, and is not arranged on the downwind side of a pollution source when the device cannot be far away;

D. the inlet and outlet are convenient, and particularly, the overhead inlet and outlet wires are convenient;

E. the distribution station is generally an independent building and can also be attached to a factory building or a building with larger load together with a carried 10(6) KV substation;

F. the equipment is convenient to transport, and particularly the transportation of a power transformer and a high-low voltage complete set of power distribution equipment needs to be considered;

G. the water-saving device is not arranged right below a toilet, a bathroom or other places where water is often accumulated and is not suitable to be adjacent to the places;

H. the device should not be installed in places with severe vibration or high temperature, and should be protected from vibration and heat if the device cannot be avoided.

8. The urban power grid planning method considering coordination of the main network and the distribution network of claim 1, wherein: the automatic construction and energy-saving measures for the power distribution network in the step 6 comprise the following steps:

1) setting an automatic switch project; in order to realize the automatic function of the power distribution network, various switch automation functions are configured according to the characteristics of a power supply area and the management requirement of the operation of a power grid system;

firstly, a cable line switch and a ring network switch are provided, a branch switch is arranged on the cable line, and a function of one remote or two remote is configured according to the switch; the looped network line should be configured with three remote functions, so that when a certain section of the looped network line breaks down, the looped network line can be automatically positioned and a fault area can be automatically isolated, the normal operation of power supply of a non-fault area is ensured, and the power failure time of the looped network line is shortened;

secondly, an automatic switching function is set for the overhead line, an automatic setting of a local switching-on and switching-off operation function needs to be set, and the two remote functions are carried out simultaneously, so that the monitoring of each network point by a master station system is realized;

setting a switching function of an overhead branch line, wherein the setting of an automatic system needs a protection function and needs to be configured with two remote functions, and when one branch fails, the failed line can be immediately cut off, so that the normal power supply of a main line is ensured;

2) energy-saving measures in power distribution network planning;

firstly, the running voltage is effectively adjusted, and the voltage running is adjusted to reduce active loss under the condition of ensuring that the voltage quality is not influenced by adjusting a tap joint of a transformer and a power capacitor on a bus, so that the running voltage loss is reduced, and the energy-saving power distribution effect is realized;

secondly, line loss target management is carried out; the power supply company executes a line loss target management responsibility system on subordinate management departments, signs responsibility books, performs branch, partial pressure and branch assessment, and brings the responsibility books into an internal economic responsibility system, so that the working enthusiasm of workers is mobilized;

balancing three-phase load; if the three-phase load is unbalanced, the loss of a line and a distribution transformer can be increased;

fourthly, various energy-saving transformers are used, so that the no-load loss of the transformers is obviously reduced;

line maintenance is enhanced, and leakage is prevented; the method mainly comprises the steps of regularly inspecting the line, timely finding and processing line leakage and connector overheating accidents, reducing loss caused by overlarge connector resistance, timely replacing unqualified insulators, frequently trimming branches of trees along the power line, and regularly cleaning a transformer, a breaker, an insulating porcelain piece and the like;

sixthly, reasonably arranging maintenance and improving the maintenance quality; when the power grid operates according to a normal operation mode, the power grid is generally safe and economical, and when equipment is overhauled, the normal operation mode is damaged, so that the line loss is increased; therefore, the equipment maintenance needs to be planned, the maintenance quality needs to be improved, the temporary maintenance needs to be reduced, the maintenance time needs to be shortened, and the live maintenance needs to be popularized;

and seventhly, the new technology, new equipment, new material and new process are popularized and applied, and the electric energy loss is reduced.

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