CN111884181A - Method for configuring simplified diagram through fixed value setting - Google Patents
Method for configuring simplified diagram through fixed value setting Download PDFInfo
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
Abstract
The invention belongs to the field of power system relay protection, and particularly relates to a method for setting a fixed value and configuring a simplified diagram, which comprises the following steps: step 1, obtaining a power distribution network SVG single line graph file from a power distribution network GIS graph model system; step 2, analyzing a SVG single line diagram file of the distribution network, identifying equipment needing to be protected in the single line diagram, deleting and filtering information of other equipment except the equipment needing to be protected, and generating a single line simplified diagram needed by distribution network setting calculation; and 3, setting a protection constant value of the equipment to be protected in the single-line simplified diagram according to a setting principle. The method can automatically generate the single-line simplified diagram required by the distribution network setting calculation according to the GIS system related to the distribution network, simultaneously display the fixed value of the corresponding protection equipment, and only need to check and examine the protection fixed value calculated by the system manually, thereby greatly improving the working efficiency of the setting calculation personnel.
Description
Technical Field
The invention belongs to the field of power system relay protection, and particularly relates to a method for setting a fixed value and configuring a simplified diagram.
Background
The power distribution network is a ring which is crucial to power supply of users, protection configuration is correctly carried out, faults are effectively isolated, and power personnel of the power distribution network must consider the faults. Along with the continuous construction of a power grid, the scale of a power distribution network is continuously enlarged, although the calculation of the external fixed value of the power distribution network is relatively simple, the power distribution network has various lines, the number of the fixed values of the lines required to be calculated by protection personnel is huge, each line needs to be manually drawn to form a protection calculation simplified diagram, the work is extremely complicated, a large amount of time is consumed, and the work efficiency is low. For example, patent CN105787819A discloses a wind farm relay protection setting calculation method, which performs setting by calculation and arrangement of protection fixed values, and the amount of related information is huge, so that a protection calculation simplified diagram still needs to be manually drawn by a worker according to a calculation result, which is tedious in work and low in work efficiency.
Disclosure of Invention
The invention provides a method for setting and configuring a simplified diagram of a fixed value, which can automatically generate a single-line simplified diagram required by setting calculation of a distribution network according to a GIS system related to the distribution network, simultaneously display the fixed value of corresponding protection equipment, and only need to check and examine the protection fixed value calculated by the system manually, thereby greatly improving the working efficiency of setting calculation personnel.
The technical scheme of the invention is as follows:
a method for configuring a simplified graph through fixed value setting comprises the following steps:
step 1, obtaining a power distribution network SVG single line graph file from a power distribution network GIS graph model system;
step 2, analyzing a SVG single line diagram file of the distribution network, identifying equipment needing to be protected in the single line diagram, deleting and filtering information of other equipment except the equipment needing to be protected, and generating a single line simplified diagram needed by distribution network setting calculation;
and 3, setting a protection constant value of the equipment to be protected in the single-line simplified diagram according to a setting principle.
Further, in the step 1, a power distribution network SVG single-line graph file is obtained from a power distribution network GIS graph model system in a link mode of an interface.
Further, the process of analyzing the SVG single line graph file of the power distribution network in the step 2 is as follows: and filtering the equipment information irrelevant to protection in the single-line diagram, only keeping the equipment information needing to be protected, including the names of the load switches, the circuit breakers, the main lines and the branch lines and important tower information, analyzing the obtained information to obtain the position of the load switches in the line and the hierarchical relationship between the load switches, arranging and arranging a simplified diagram according to the position and the hierarchical relationship, exporting the simplified diagram to a folder, and automatically generating the single-line simplified diagram required for setting calculation.
Further, the setting principle in step 3 means: setting the current-switching protection function of the circuit breakers at different positions and setting the load switch switching logic of the circuit.
Further, the different position circuit breakers include: the power distribution network first section breaker, the power distribution network non-first section breaker, the branch line section breaker, the 10kV user incoming line switch or the demarcation breaker.
Further, the setting process of the protection fixed value of the first section breaker of the power distribution network is as follows:
the method comprises the steps of current quick-break protection, timing limit overcurrent protection, zero-sequence overcurrent protection and reclosing protection;
current quick-break protection: setting according to the fixed value of 90% or less of the overcurrent I section of the feeder switch protection of the transformer substation, and taking the action time of not more than 0.15S;
and (4) timing limit overcurrent protection: setting according to the maximum allowable load current of a circuit on the load side of the circuit breaker, checking that the protection sensitivity of the current section of the circuit is not less than 1.3, matching the action time with the superior, and setting the time step difference to be not less than 0.25S;
zero-sequence overcurrent protection: the transformer substation feeder switch protection zero sequence I section constant value is matched and set, the action time is matched with the upper level, and the time step difference is not less than 0.25S;
protection of reclosure: and (3) switching non-synchronous reclosing modes, only switching reclosing once, wherein the reclosing time is 1S, and a circuit with a power supply for surfing the Internet adopts a disconnection reclosing mode.
Further, the setting process of the protection fixed value of the non-first segmented circuit breaker of the power distribution network is as follows:
the method comprises the steps of current quick-break protection, timing limit overcurrent protection, zero-sequence overcurrent protection and reclosing protection;
current quick-break protection: setting according to the current quick-break protection fixed value of not more than 90% of the current quick-break protection fixed value of the upper-stage segmented circuit breaker, and taking 0S as the action time;
and (4) timing limit overcurrent protection: the method is matched with a timing limit overcurrent protection fixed value of a first-stage segmented circuit breaker on a distribution network, the sensitivity of the protection of the current segment of a check line is not less than 1.3, the action time is matched with the upper stage, and the time step difference is not less than 0.25S;
zero-sequence overcurrent protection: the method is matched with a zero sequence overcurrent protection fixed value of a first-stage segmented circuit breaker on a distribution network, the action time is matched with the upper stage, and the time difference is not lower than 0.25S;
protection of reclosure: and (3) switching non-synchronous reclosing modes, only switching reclosing once, wherein the reclosing time is 1S, and a circuit with a power supply for surfing the Internet adopts a disconnection reclosing mode.
Further, the setting process of the protection fixed value of the branch line sectionalized circuit breaker is as follows:
if the branch line sectional breaker is a first-stage switch after the outgoing line of the transformer substation, setting according to the principle of a first sectional breaker of the power distribution network; and if the first-stage switch is arranged after the outgoing line of the non-transformer substation, setting according to the principle of the non-first section breaker of the power distribution network.
Further, the setting process of the protection fixed value of the 10kV user incoming line switch or the demarcation circuit breaker is as follows:
the method comprises the following steps of current quick-break protection: the quick-break protection section of the maximum capacity distribution change in the electric room is set, the action time is 0S, and if the maximum capacity distribution change in the electric room is 800kVA or less, the primary value is 1000A.
Further, the process of setting the protection fixed value of the load switch is as follows:
setting the closing delay time, closing confirmation time, opening delay time and voltage fixed value of a load switch;
a parameter setting principle of closing delay time and closing confirmation time; in order to avoid the reclosing charging time of a 10kV feeder switch in a transformer substation, setting the closing delay time of a first load switch for 35s according to the out-of-substation line sequence, if the first load switch has a secondary reclosing function, setting according to 7s, and setting the closing delay time of each stage of load switches later for 7 s; setting the closing confirmation time of each stage of load switches for 5 s; setting the time of a main line load switch according to the time of a branch line provided with a demarcation circuit breaker;
parameter setting principle of brake-separating delay time: the opening delay time of the load switch is matched with the reclosing time of the upper-level power line, and the opening delay time is set to be 3.5S in order to ensure that the switch can correctly act when the line is in voltage loss;
parameter setting principle of voltage constant value: the voltage fixed value comprises two conditions of voltage loss and voltage; the voltage loss constant value is 25% of rated voltage setting, and the voltage loss delay time is set to be 0.5S; and setting the voltage constant value to be 80% of rated voltage, and setting the voltage delay time to be 0.5S.
The invention has the beneficial effects that:
the invention provides a method for setting and configuring a simplified diagram of a distribution network line automatic switch fixed value from the perspective of distribution network protection workers, a related SVG single line diagram is obtained by butting a GIS system of a distribution network, the SVG single line diagram is automatically simplified to form a single line simplified diagram required by distribution network protection setting calculation, the fixed value of corresponding protection equipment is set and displayed according to a setting principle and is displayed in the system in a visual form, an operator can give a fixed value list only by checking the fixed value calculated by the system, and the working efficiency of the setting calculator is greatly improved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a single line simplified pictorial illustration in one embodiment.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1, a method for configuring a simplified diagram of a constant value setting includes the following steps:
step 1, obtaining a power distribution network SVG single line graph file from a power distribution network GIS graph model system;
step 2, analyzing a SVG single line diagram file of the distribution network, identifying equipment needing to be protected in the single line diagram, deleting and filtering information of other equipment except the equipment needing to be protected, and generating a single line simplified diagram needed by distribution network setting calculation;
and 3, setting a protection constant value of the equipment to be protected in the single-line simplified diagram according to a setting principle.
In the embodiment, the SVG single-line graph file of the power distribution network is acquired from the GIS graph model system of the power distribution network in a link mode of the interface. The SVG single line diagram file is converted by using a dom file analysis technology in java after the single line diagram is read from the GIS system.
In this embodiment, the process of analyzing the SVG single line graph file of the power distribution network in step 2 is as follows: and filtering the equipment information irrelevant to protection in the single-line diagram, only keeping the equipment information needing to be protected, including the names of the load switches, the circuit breakers, the main lines and the branch lines and important tower information, analyzing the obtained information to obtain the position of the load switches in the line and the hierarchical relationship between the load switches, arranging and arranging a simplified diagram according to the position and the hierarchical relationship, exporting the simplified diagram to a folder, and automatically generating the single-line simplified diagram required for setting calculation.
In this embodiment, the setting rule in step 3 refers to: setting the current-switching protection function of the circuit breakers at different positions and setting the load switch switching logic of the circuit.
Wherein, the circuit breaker of different positions includes: the power distribution network first section breaker, the power distribution network non-first section breaker, the branch line section breaker, the 10kV user incoming line switch or the demarcation breaker.
The setting process for carrying out protection fixed value on the first segmented circuit breaker of the power distribution network is as follows:
the method comprises the steps of current quick-break protection, timing limit overcurrent protection, zero-sequence overcurrent protection and reclosing protection;
current quick-break protection: setting according to the fixed value of 90% or less of the overcurrent I section of the feeder switch protection of the transformer substation, and taking the action time of not more than 0.15S;
and (4) timing limit overcurrent protection: setting according to the maximum allowable load current of a circuit on the load side of the circuit breaker, checking that the protection sensitivity of the current section of the circuit is not less than 1.3, matching the action time with the superior, and setting the time step difference to be not less than 0.25S;
zero-sequence overcurrent protection: the transformer substation feeder switch protection zero sequence I section constant value is matched and set, the action time is matched with the upper level, and the time step difference is not less than 0.25S;
protection of reclosure: and (3) switching non-synchronous reclosing modes, only switching reclosing once, wherein the reclosing time is 1S, and a circuit with a power supply for surfing the Internet adopts a disconnection reclosing mode.
The setting process of the protection fixed value of the non-first segmented circuit breaker of the power distribution network is as follows:
the method comprises the steps of current quick-break protection, timing limit overcurrent protection, zero-sequence overcurrent protection and reclosing protection;
current quick-break protection: setting according to the current quick-break protection fixed value of not more than 90% of the current quick-break protection fixed value of the upper-stage segmented circuit breaker, and taking 0S as the action time;
and (4) timing limit overcurrent protection: the method is matched with a timing limit overcurrent protection fixed value of a first-stage segmented circuit breaker on a distribution network, the sensitivity of the protection of the current segment of a check line is not less than 1.3, the action time is matched with the upper stage, and the time step difference is not less than 0.25S;
zero-sequence overcurrent protection: the method is matched with a zero sequence overcurrent protection fixed value of a first-stage segmented circuit breaker on a distribution network, the action time is matched with the upper stage, and the time difference is not lower than 0.25S;
protection of reclosure: and (3) switching non-synchronous reclosing modes, only switching reclosing once, wherein the reclosing time is 1S, and a circuit with a power supply for surfing the Internet adopts a disconnection reclosing mode.
The setting process of the protection fixed value of the branch line section breaker comprises the following steps:
if the branch line sectional breaker is a first-stage switch after the outgoing line of the transformer substation, setting according to the principle of a first sectional breaker of the power distribution network; and if the first-stage switch is arranged after the outgoing line of the non-transformer substation, setting according to the principle of the non-first section breaker of the power distribution network.
The setting process of the protection fixed value of the 10kV user incoming line switch or the demarcation circuit breaker is as follows:
the method comprises the following steps of current quick-break protection: the quick-break protection section of the maximum capacity distribution change in the electric room is set, the action time is 0S, and if the maximum capacity distribution change in the electric room is 800kVA or less, the primary value is 1000A.
The setting process of the protection constant value of the load switch comprises the following steps:
setting the closing delay time (X time), closing confirmation time (Y time), opening delay time (Z time) and voltage fixed value of a load switch;
a parameter setting principle of closing delay time (X time) and closing confirmation time (Y time); in order to avoid the reclosing charging time of a 10kV feeder switch in a transformer substation, setting the closing delay time of a first load switch for 35s according to the out-of-substation line sequence, if the first load switch has a secondary reclosing function, setting according to 7s, and setting the closing delay time of each stage of load switches later for 7 s; setting the closing confirmation time of each stage of load switches for 5 s; setting the time of a main line load switch according to the time of a branch line provided with a demarcation circuit breaker;
parameter setting principle of brake-separating delay time (Z time): the opening delay time of the load switch is matched with the reclosing time of the power line at the upper stage, in order to ensure that the switch can correctly act when the line is in voltage loss, the opening delay time (Z time) is set to be 3.5S, and the condition that the sectional load switch is mistakenly opened during the reclosing period of the power line at the upper stage of 110kV or 35kV is prevented.
Parameter setting principle of voltage constant value: the voltage fixed value comprises two conditions of voltage loss and voltage; the voltage loss constant value is 25% of rated voltage setting, and the voltage loss delay time is set to be 0.5S; and setting the voltage constant value to be 80% of rated voltage, and setting the voltage delay time to be 0.5S.
Referring to fig. 2, taking a simplified diagram of a substation in a certain place as an example, the diagram includes a main line of 110KV and three branch lines of T1, T2 and T3, the main line is provided with a first section breaker F1, a load switch a, a load switch B and a load switch C of a distribution network, the branch line of T1 is provided with a branch line section breaker F2, the branch line of T2 is provided with a branch line section breaker F3, and the branch line of T3 is provided with a branch line section breaker F4 and a load switch D;
the protection fixed value of the first section breaker F1 is set as: current quick-break protection Ig 1: 3000A/0.1S, timing-limited over-current protection Ig 2: 408A/0.6S and 1S of primary reclosing;
the setting of the protection constant value of the load switch A is as follows: the X time is 35S, Y time is 5S, Z time is 3.5S;
the setting of the protection fixed value of the load switch B is as follows: the X time is 7S, Y time is 5S, Z time is 3.5S;
the setting of the protection fixed value of the load switch C is as follows: the X time is 7S, Y time is 5S, Z time is 3.5S;
the protection fixed value of the branch line section breaker F2 is set as: current quick-break protection Ig 1: 2700A/0S, timing-limited overcurrent protection Ig 2: 360A/0.35S, zero sequence overcurrent protection I0: 54A/0.35S and 1S of primary reclosure;
the protection fixed value of the branch line section breaker F3 is set as: current quick-break protection Ig 1: 2700A/0S, timing-limited overcurrent protection Ig 2: 360A/0.35S, zero sequence overcurrent protection I0: 54A/0.35S and 1S of primary reclosure;
the protection fixed value of the branch line section breaker F4 is set as: current quick-break protection Ig 1: 2700A/0S, timing-limited overcurrent protection Ig 2: 360A/0.35S, zero sequence overcurrent protection I0: 54A/0.35S and 1S of primary reclosure;
the protection constant value of the load switch D is set as follows: the X time is 35S, Y time is 5S, Z time is 3.5S;
the method simplifies and forms the single-line simplified diagram required by the distribution network protection setting calculation, sets the inlet line of the simplified diagram, displays the fixed value of the corresponding protection equipment, displays the fixed value in a visual form in the system, and can provide a fixed value list only by checking the fixed value calculated by the system by an operator, thereby greatly improving the working efficiency of the setting calculator.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method for configuring a simplified graph through fixed value setting is characterized by comprising the following steps:
step 1, obtaining a power distribution network SVG single line graph file from a power distribution network GIS graph model system;
step 2, analyzing a SVG single line diagram file of the distribution network, identifying equipment needing to be protected in the single line diagram, deleting and filtering information of other equipment except the equipment needing to be protected, and generating a single line simplified diagram needed by distribution network setting calculation;
and 3, setting a protection constant value of the equipment to be protected in the single-line simplified diagram according to a setting principle.
2. The method for configuring the simplified diagram for the setting of the fixed value according to claim 1, wherein in the step 1, the SVG single line diagram file of the power distribution network is obtained from the GIS diagram module system of the power distribution network in a link mode of an interface.
3. The method for configuring the simplified diagram for the fixed value setting according to claim 1, wherein the process for analyzing the SVG single line diagram file of the power distribution network in the step 2 is as follows: and filtering the equipment information irrelevant to protection in the single-line diagram, only keeping the equipment information needing to be protected, including the names of the load switches, the circuit breakers, the main lines and the branch lines and important tower information, analyzing the obtained information to obtain the position of the load switches in the line and the hierarchical relationship between the load switches, arranging and arranging a simplified diagram according to the position and the hierarchical relationship, exporting the simplified diagram to a folder, and automatically generating the single-line simplified diagram required for setting calculation.
4. The method for configuring the simplified graph for constant value setting according to claim 3, wherein the setting principle in step 3 is as follows: setting the current-switching protection function of the circuit breakers at different positions and setting the load switch switching logic of the circuit.
5. The method of claim 4, wherein the circuit breakers in different positions comprise: the power distribution network first section breaker, the power distribution network non-first section breaker, the branch line section breaker, the 10kV user incoming line switch or the demarcation breaker.
6. The method for setting the configuration simplification graph with the fixed value according to claim 5, wherein the setting process of the protection fixed value of the first segmented circuit breaker of the power distribution network is as follows:
the method comprises the steps of current quick-break protection, timing limit overcurrent protection, zero-sequence overcurrent protection and reclosing protection;
current quick-break protection: setting according to the fixed value of 90% or less of the overcurrent I section of the feeder switch protection of the transformer substation, and taking the action time of not more than 0.15S;
and (4) timing limit overcurrent protection: setting according to the maximum allowable load current of a circuit on the load side of the circuit breaker, checking that the protection sensitivity of the current section of the circuit is not less than 1.3, matching the action time with the superior, and setting the time step difference to be not less than 0.25S;
zero-sequence overcurrent protection: the transformer substation feeder switch protection zero sequence I section constant value is matched and set, the action time is matched with the upper level, and the time step difference is not less than 0.25S;
protection of reclosure: and (3) switching non-synchronous reclosing modes, only switching reclosing once, wherein the reclosing time is 1S, and a circuit with a power supply for surfing the Internet adopts a disconnection reclosing mode.
7. The method for setting the configuration simplification graph with the fixed value according to claim 5, wherein the setting process of the protection fixed value of the non-first segmented circuit breaker of the power distribution network is as follows:
the method comprises the steps of current quick-break protection, timing limit overcurrent protection, zero-sequence overcurrent protection and reclosing protection;
current quick-break protection: setting according to the current quick-break protection fixed value of not more than 90% of the current quick-break protection fixed value of the upper-stage segmented circuit breaker, and taking 0S as the action time;
and (4) timing limit overcurrent protection: the method is matched with a timing limit overcurrent protection fixed value of a first-stage segmented circuit breaker on a distribution network, the sensitivity of the protection of the current segment of a check line is not less than 1.3, the action time is matched with the upper stage, and the time step difference is not less than 0.25S;
zero-sequence overcurrent protection: the method is matched with a zero sequence overcurrent protection fixed value of a first-stage segmented circuit breaker on a distribution network, the action time is matched with the upper stage, and the time difference is not lower than 0.25S;
protection of reclosure: and (3) switching non-synchronous reclosing modes, only switching reclosing once, wherein the reclosing time is 1S, and a circuit with a power supply for surfing the Internet adopts a disconnection reclosing mode.
8. The method of claim 5, wherein the setting of the protection constant value of the branch line segment circuit breaker is performed by the following steps:
if the branch line sectional breaker is a first-stage switch after the outgoing line of the transformer substation, setting according to the principle of a first sectional breaker of the power distribution network; and if the first-stage switch is arranged after the outgoing line of the non-transformer substation, setting according to the principle of the non-first section breaker of the power distribution network.
9. The method for configuring the simplified diagram for setting the fixed value according to claim 5, wherein the process for setting the protection fixed value of the 10kV user incoming line switch or the demarcation circuit breaker is as follows:
the method comprises the following steps of current quick-break protection: the quick-break protection section of the maximum capacity distribution change in the electric room is set, the action time is 0S, and if the maximum capacity distribution change in the electric room is 800kVA or less, the primary value is 1000A.
10. The method for configuring the simplified diagram for setting the fixed value according to claim 4, wherein the process for setting the protection fixed value of the load switch comprises the following steps:
setting the closing delay time, closing confirmation time, opening delay time and voltage fixed value of a load switch;
a parameter setting principle of closing delay time and closing confirmation time; in order to avoid the reclosing charging time of a 10kV feeder switch in a transformer substation, setting the closing delay time of a first load switch for 35s according to the out-of-substation line sequence, if the first load switch has a secondary reclosing function, setting according to 7s, and setting the closing delay time of each stage of load switches later for 7 s; setting the closing confirmation time of each stage of load switches for 5 s; setting the time of a main line load switch according to the time of a branch line provided with a demarcation circuit breaker;
parameter setting principle of brake-separating delay time: the opening delay time of the load switch is matched with the reclosing time of the upper-level power line, and the opening delay time is set to be 3.5S in order to ensure that the switch can correctly act when the line is in voltage loss;
parameter setting principle of voltage constant value: the voltage fixed value comprises two conditions of voltage loss and voltage; the voltage loss constant value is 25% of rated voltage setting, and the voltage loss delay time is set to be 0.5S; and setting the voltage constant value to be 80% of rated voltage, and setting the voltage delay time to be 0.5S.
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| CN112653125A (en) * | 2020-11-17 | 2021-04-13 | 国网山东省电力公司青岛供电公司 | Method and system for automatically generating power distribution network switch visual constant value matching diagram |
| CN114221312A (en) * | 2021-12-30 | 2022-03-22 | 广东电网有限责任公司茂名供电局 | Topological relation-based power distribution network protection rapid setting and checking method |
| CN114243652A (en) * | 2021-11-30 | 2022-03-25 | 云南电网有限责任公司昆明供电局 | Terminal constant value remote modification system for 10kV line power distribution switch |
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| CN114243652A (en) * | 2021-11-30 | 2022-03-25 | 云南电网有限责任公司昆明供电局 | Terminal constant value remote modification system for 10kV line power distribution switch |
| CN114243652B (en) * | 2021-11-30 | 2023-05-26 | 云南电网有限责任公司昆明供电局 | Terminal fixed value remote modification system for 10kV line distribution switch |
| CN114221312A (en) * | 2021-12-30 | 2022-03-22 | 广东电网有限责任公司茂名供电局 | Topological relation-based power distribution network protection rapid setting and checking method |
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