CN113013877B - Method for providing loop closing and transferring between 35kV lines under phase difference condition - Google Patents
Method for providing loop closing and transferring between 35kV lines under phase difference condition Download PDFInfo
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- CN113013877B CN113013877B CN202110244186.5A CN202110244186A CN113013877B CN 113013877 B CN113013877 B CN 113013877B CN 202110244186 A CN202110244186 A CN 202110244186A CN 113013877 B CN113013877 B CN 113013877B
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- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a loop closing transfer method between 35kV lines under the phase difference condition, which is characterized in that 220kV substations involved in a loop closing line are defined as a substation C, a 110kV substation is defined as a substation D, and two 35kV substations between a 35kV outgoing line at the low-voltage side of the substation C and a 35kV outgoing line at the medium-voltage side of the substation D are defined as a substation A and a substation B; the line between substation a and substation B is defined as a closed loop line. The invention can effectively solve the problem that the existing two different voltage levels cannot be directly closed because of phase difference when the two different voltage levels are closed. If the ring is directly connected, tripping may occur due to the fact that the current exceeds the line protection fixed value, and power failure of the transformer substation in the loop is caused. If the local standby automatic switching device of the transformer substation is utilized, the line-in switch is tripped, the standby line switch is closed, the power supply is switched, and the problem of short-time power failure can be solved.
Description
Technical Field
The invention relates to a loop closing transfer method between 35kV lines under the phase difference condition.
Background
Most of the distribution networks in China are in a radial single-loop wiring mode. When the line breaks down, the power supply needs to be cut off, so that the short-time power failure of the user side of the branch circuit is caused, the stability of power supply of the system is destroyed, and the requirement of a user on the power supply continuity cannot be met. The loop-closing converts two or more distribution lines of the same voltage class from radial wiring to annular wiring by closing the tie switch. The loop closing power supply is used as a novel power supply mode, an extra line is not required to be erected, when a fault occurs and power failure operation is required, electric energy can be obtained from another branch through a contact switch (a loop closing point is arranged on a branch) or a bus-bar switch (a loop closing point is arranged on a bus), the investment of line construction is saved, and meanwhile, the continuity and reliability of power supply are guaranteed.
When the two different voltage levels are looped, the loops cannot be looped directly because of the phase difference. If the ring is directly connected, tripping may occur due to the fact that the current exceeds the line protection fixed value, and power failure of the transformer substation in the loop is caused. If the local standby automatic switching device of the transformer substation is utilized, the line-in switch is tripped, the standby line switch is closed, the power supply is switched, and the problem of short-time power failure can be solved.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a method for switching the loop between 35kV lines under the phase difference condition, which solves the problem that the loop can not be directly switched due to the phase difference when the loop between two different voltage levels is switched. If the ring is directly connected, tripping may occur due to the fact that the current exceeds the line protection fixed value, and power failure of the transformer substation in the loop is caused. If the local standby automatic switching device of the transformer substation is utilized, the line-in switch is tripped, the standby line switch is closed, the power supply is switched, and the problem of short-time power failure can be solved.
In order to achieve the above purpose, the present invention provides the following technical solutions: a loop closing transfer method between 35kV lines under the phase difference condition,
the 220kV transformer substation involved in the loop to be closed is defined as a transformer substation C, the 110kV transformer substation is defined as a transformer substation D, and two 35kV transformer substations between a 35kV outgoing line on the low-voltage side of the transformer substation C and a 35kV outgoing line on the medium-voltage side of the transformer substation D are defined as a transformer substation A and a transformer substation B; the line between the transformer substation A and the transformer substation B is defined as a loop closing line;
under the condition of phase difference, simulating to close a hot standby switch on the loop closing line through the simulation operation function of the SCADA system, and calculating a loop current value of a 35kV interconnecting line between a transformer substation C and a transformer substation D; respectively comparing the loop current value with the protection fixed values of all the line switches on the 35kV interconnecting line;
if the protection fixed values are all larger than the loop current value, judging that the simulated loop closing is successful, realizing the actual operation of the power grid loop closing by closing a hot standby switch on a loop closing line, and after the loop closing is completed, disconnecting a line switch on a line to be overhauled to carry out loop opening until the loop closing is completed without power failure;
if the protection fixed value is smaller than or equal to the loop current value, the loop fitting is judged to be unsuccessful, and the actual operation of the power grid loop fitting cannot be directly carried out; at this time, the protection fixed value is adjusted firstly, all the protection fixed values smaller than or equal to the protection fixed value are adjusted to be larger than the loop current value, then the actual operation of closing the loop of the power grid is carried out, after closing the loop, the circuit switch on the line to be overhauled is disconnected for opening the loop, and the uninterrupted power supply of closing the loop is completed; and finally, the adjusted protection fixed values are all adjusted back to the original fixed values.
Further, when the protection fixed value is adjusted, the protection fixed value can be adjusted remotely through the SCADA system or directly through an operator.
Further, when the protection values are all larger than the loop current value, the protection values of the line switches on the two sides of the line to be overhauled are adjusted to be smaller than the loop current value, then the actual operation of closing the loop of the power grid is carried out, after closing the loop, the line switches on the line to be overhauled can automatically jump, the loop is opened, the power supply is not interrupted until the closing of the loop is completed, and the adjusted protection fixed value is adjusted to the original fixed value.
Further, the line to be overhauled is defined as a decyclization line, and the rest lines are defined as non-decyclization lines; when the protection fixed values are smaller than or equal to the loop current value, all the protection fixed values smaller than or equal to the protection fixed values on the non-loop-opening line are adjusted to be larger than the loop current value, and all the protection fixed values larger than the protection fixed values on the loop-opening line are adjusted to be smaller than the loop current value; then closing a hot standby switch on the loop closing line to perform actual operation of closing the loop of the power grid, and automatically tripping a line switch on the loop opening line after closing the loop to complete loop opening, so that the loop closing is completed without power failure; and finally, the adjusted protection fixed values are all adjusted back to the original fixed values.
Further, the circuit switches on the two sides of the line to be overhauled are set with different action time limits, and the action time limit time interval of the circuit switches on the two sides of the line to be overhauled is 0.2-0.3s.
Further, a line between a low-voltage side 35kV outgoing line of the transformer substation C and a medium-voltage side 35kV outgoing line of the transformer substation D is defined as a ring network line; when a ring network line is selected in the SCADA system, the protection fixed values of all line switches on the ring network line and the loop current value of the ring network line are displayed in a histogram mode; and when the protection fixed value is smaller than the loop current value, reminding can be carried out in a color change and flashing mode.
Further, a current protection device for measuring the hot standby switching current value on the loop closing line in real time is arranged, the current protection device is connected with a tripping circuit of a line switch adjacent to the loop opening line, and when the loop closing is completed, the current protection device starts the tripping circuit when measuring that the hot standby switching current value is larger than a set monitoring value, so that the line switch of the loop opening line is tripped.
Compared with the prior art, the invention calculates the loop current value of the 35kV interconnecting line between the transformer substation C and the transformer substation D by simulating the hot standby switch on the closed loop line on the SCADA system, and then respectively compares the loop current value with the protection fixed values of all the line switches on the 35kV interconnecting line to judge whether the loop can be directly connected, and realizes the direct loop closing of the actual operation by adjusting the protection fixed values of the line switches so as to achieve the loop closing transfer without power failure. The problem that the existing two different voltage levels cannot be directly connected with the ring due to phase difference when the ring is connected with the other two different voltage levels is effectively solved; if the ring is directly connected, tripping may occur due to the fact that the current exceeds the line protection fixed value, and power failure of the transformer substation in the loop is caused. If the local standby automatic switching device of the transformer substation is utilized, the line-in switch is tripped, the standby line switch is closed, the power supply is switched, and the problem of short-time power failure can be solved.
Drawings
Fig. 1 is a schematic diagram of the present invention involving wiring.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a method for transferring a loop between 35kV lines under a phase difference condition defines 220kV substations involved in the loop to be closed as a substation C,110kV substations as a substation D, and two 35kV substations between a low-voltage side 35kV outgoing line of the substation C and a medium-voltage side 35kV outgoing line of the substation D as a substation a and a substation B; the line between the transformer substation A and the transformer substation B is defined as a loop closing line;
under the condition of phase difference, simulating to close the hot standby switch 2 on the loop closing line through the simulation operation function of the SCADA system, and calculating the loop current value of the 35kV interconnecting line between the transformer substation C and the transformer substation D, namely the loop current value between the 35kV outgoing line on the low-voltage side of the transformer substation C and the 35kV outgoing line on the medium-voltage side of the transformer substation D; comparing the loop current value with the protection fixed values of all the line switches 1 and the hot standby switch 2 on the 35kV interconnecting line respectively;
if the protection fixed values are all larger than the loop current value, judging that the simulated loop closing is successful, realizing the actual operation of the power grid loop closing by closing the hot standby switch 2 on the loop closing line, and after the loop closing is completed, disconnecting the line switch 1 on the line to be overhauled to carry out loop opening until the loop closing is completed without power failure;
if the protection fixed value is smaller than or equal to the loop current value, the loop fitting is judged to be unsuccessful, and the actual operation of the power grid loop fitting cannot be directly carried out; at this time, the protection fixed value is adjusted firstly, all the protection fixed values smaller than or equal to the protection fixed value are adjusted to be larger than the loop current value, then the hot standby switch 2 on the loop closing line is closed to realize the actual operation of closing the loop of the power grid, after the loop closing is completed, the line switch 1 on the line to be overhauled is opened to carry out loop opening, and the loop closing is completed without power failure; and finally, the adjusted protection fixed values are all adjusted back to the original fixed values.
When the protection fixed value is adjusted, the protection fixed value can be adjusted remotely through the SCADA system or can be adjusted directly through an operator.
When the protection fixed values are all larger than the loop current value, the protection fixed values of the line switches 1 on two sides/ends of the line to be overhauled are adjusted to be smaller than the loop current value, then the hot standby switch 2 on the loop closing line is closed to realize the actual operation of closing the loop of the power grid, after the loop closing is completed, the line switches 1 on the line to be overhauled can be automatically opened to complete the loop opening, the loop closing is completed without power failure, and the adjusted protection fixed value is adjusted to be the original fixed value.
Defining the line to be overhauled as a decyclization line, and defining the rest lines as non-decyclization lines; when the protection fixed values are smaller than or equal to the loop current value, all the protection fixed values smaller than or equal to the protection fixed values on the non-loop-opening line are adjusted to be larger than the loop current value, and all the protection fixed values larger than the protection fixed values on the loop-opening line are adjusted to be smaller than the loop current value; then, closing a hot standby switch 2 on the loop closing line to perform actual operation of closing the loop of the power grid, and automatically tripping a line switch 1 on the loop opening line after closing the loop to complete loop opening, so that the loop closing is completed without power failure; and finally, the adjusted protection fixed values are all adjusted back to the original fixed values.
Setting different action time limits for the line switches 1 on two sides of the line to be overhauled, wherein the action time limit time interval of the line switches on two sides of the line to be overhauled is 0.2-0.3s.
Defining a line between a 35kV outgoing line on the low-voltage side of the transformer substation C and a 35kV outgoing line on the medium-voltage side of the transformer substation D as a looped network line; when a ring network line is selected in the SCADA system, the protection fixed values of all the line switches 1 on the ring network line and the loop current value of the ring network line are displayed in a histogram mode; and when the protection fixed value is smaller than the loop current value, reminding can be carried out in a color change and flashing mode.
And setting a current protection device for measuring the hot standby switching current value on the loop closing line in real time, wherein the current protection device is connected with a tripping circuit of a line switch 1 adjacent to the loop opening line, and when the loop closing is completed, the current protection device starts the tripping circuit to enable the line switch 1 of the loop opening line to trip when the hot standby switching current value is measured to be larger than a set monitoring value.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A loop closing transfer method between 35kV lines under the phase difference condition is characterized in that:
the 220kV transformer substation involved in the loop to be closed is defined as a transformer substation C, the 110kV transformer substation is defined as a transformer substation D, and two 35kV transformer substations between a 35kV outgoing line on the low-voltage side of the transformer substation C and a 35kV outgoing line on the medium-voltage side of the transformer substation D are defined as a transformer substation A and a transformer substation B respectively; the line between the transformer substation A and the transformer substation B is defined as a loop closing line;
under the condition of phase difference, simulating to close a hot standby switch on the loop closing line through the simulation operation function of the SCADA system, and calculating a loop current value of a 35kV connecting line between a transformer substation C and a transformer substation D, namely a loop current value between a 35kV outgoing line on the low-voltage side of the transformer substation C and a 35kV outgoing line on the medium-voltage side of the transformer substation D; comparing the loop current value with the protection fixed values of all the circuit switches and the hot standby switches on the 35kV interconnecting line respectively;
if the protection fixed values are all larger than the loop current value, judging that the simulated loop closing is successful, realizing the actual operation of the power grid loop closing by closing a hot standby switch on a loop closing line, and after the loop closing is completed, disconnecting a line switch on a line to be overhauled to carry out loop opening until the loop closing is completed without power failure;
if the protection fixed value is smaller than or equal to the loop current value, the loop fitting is judged to be unsuccessful, and the actual operation of the power grid loop fitting cannot be directly carried out; at this time, the protection fixed value is adjusted firstly, all the protection fixed values smaller than or equal to the protection fixed value are adjusted to be larger than the loop current value, then the actual operation of closing the loop of the power grid is carried out, after closing the loop, the circuit switch on the line to be overhauled is disconnected for opening the loop, and the uninterrupted power supply of closing the loop is completed; finally, the adjusted protection fixed values are all adjusted back to the original fixed values;
when the protection fixed values are all larger than the loop current value, the protection fixed values of the line switches on the two sides of the line to be overhauled are adjusted to be smaller than the loop current value, then the actual operation of closing the loop of the power grid is carried out, after closing the loop, the line switches on the line to be overhauled can be automatically jumped, the loop is completed to be opened, the power supply is not interrupted until the closing of the loop is completed, and the adjusted protection fixed value is adjusted to the original fixed value;
defining the line to be overhauled as a decyclization line, and defining the rest lines as non-decyclization lines; when the protection fixed values are smaller than or equal to the loop current value, all the protection fixed values smaller than or equal to the protection fixed values on the non-loop-opening line are adjusted to be larger than the loop current value, and all the protection fixed values larger than the protection fixed values on the loop-opening line are adjusted to be smaller than the loop current value; then closing a hot standby switch on the loop closing line to perform actual operation of closing the loop of the power grid, and automatically tripping a line switch on the loop opening line after closing the loop to complete loop opening, so that the loop closing is completed without power failure; finally, the adjusted protection fixed values are all adjusted back to the original fixed values;
defining a line between a 35kV outgoing line on the low-voltage side of the transformer substation C and a 35kV outgoing line on the medium-voltage side of the transformer substation D as a looped network line; when a ring network line is selected in the SCADA system, the protection fixed values of all line switches on the ring network line and the loop current value of the ring network line are displayed in a histogram mode; when the protection fixed value is smaller than the loop current value, reminding is carried out in a color change and flickering mode;
and setting a current protection device for measuring the hot standby switching current value on the loop closing circuit in real time, wherein the current protection device is connected with a tripping circuit of a circuit switch adjacent to the loop opening circuit, and when the loop closing is completed, the current protection device starts the tripping circuit to enable the circuit switch of the loop opening circuit to trip when the hot standby switching current value is measured to be larger than a set monitoring value.
2. The method for transferring the loop between 35kV lines under the phase difference condition according to claim 1, wherein the method comprises the following steps: when the protection fixed value is adjusted, the protection fixed value can be adjusted remotely through the SCADA system or can be adjusted directly through an operator.
3. The method for transferring the loop between 35kV lines under the phase difference condition according to claim 1, wherein the method comprises the following steps: setting different action time limits for the line switches on two sides of the line to be overhauled, wherein the action time limit time interval of the line switches on two sides of the line to be overhauled is 0.2-0.3s.
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| CN202110244186.5A CN113013877B (en) | 2021-03-05 | 2021-03-05 | Method for providing loop closing and transferring between 35kV lines under phase difference condition |
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| CN113991521A (en) * | 2021-11-11 | 2022-01-28 | 国网江苏省电力有限公司苏州供电分公司 | Power grid closed loop regulation and control method and breaker maintenance method |
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