CN113629673A - Relay protection fixed value updating method and device and computer readable storage medium - Google Patents

Relay protection fixed value updating method and device and computer readable storage medium Download PDF

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CN113629673A
CN113629673A CN202111072482.8A CN202111072482A CN113629673A CN 113629673 A CN113629673 A CN 113629673A CN 202111072482 A CN202111072482 A CN 202111072482A CN 113629673 A CN113629673 A CN 113629673A
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current
constant value
protection device
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CN113629673B (en
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景杰
张朝平
张建设
董振军
庞现泽
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Shanghai Sany Electronic Technology Co ltd
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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
    • 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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Abstract

Compared with the traditional updating mode, the method and the equipment for updating the protection constant value of the power grid relay protection device and the computer readable storage medium save the steps of inputting performance parameters of cables and electrical components, counting the information of the electrical equipment of each branch line and the like, can conveniently and efficiently calculate the current protection constant value of the target relay protection device, further update, reduce the workload and improve the efficiency.

Description

Relay protection fixed value updating method and device and computer readable storage medium
Technical Field
The invention belongs to the technical field of power grids, and particularly relates to a method and equipment for updating a protection constant value of a power grid relay protection device and a computer readable storage medium.
Background
For an electric network, such as a coal mine electric network, due to migration of a coal mining working face, a power supply network structure at the tail end of a power supply system comprises electric equipment which is constantly changing, and changes for a plurality of times every month almost, and accordingly, a protection fixed value of a relay protection device in electric network monitoring needs to be updated accordingly, otherwise, false operation or refusal operation of the relay protection device is caused due to inapplicability of the protection fixed value, and serious adverse effects are caused on mine safety production.
At present, in a power grid monitoring system, current protection of a relay protection device adopts three-section protection, wherein:
current I section: the action current setting value is maximum, and the action time is usually 0 second, so the circuit is called as 'quick-break protection' and is mainly used for dealing with short-circuit faults at a short distance of the circuit.
Current II section: the action current setting value is small, the action time is usually 0.5 second, and the protection circuit is also called as overcurrent protection and is mainly used for dealing with the tail end short circuit fault of the line and serving as backup protection of the fault of the next section of line.
Current III section: the minimum setting value of the action current (which is only 20-50% larger than the rated current) and the maximum action time (more than 1 second) are also called overload protection, and the overload protection circuit is mainly used for coping with the overload of the current line and is used as the backup protection of the overcurrent of the next section of line.
At present, the current protection constant value of three-section protection is updated basically by inputting performance parameters of cables and electrical components after a power grid topological graph is manually drawn by a power grid configuration tool, counting the information of electric equipment of each branch line, then counting and calculating the current protection constant value through constant value calculation software, and further updating, wherein if the network topological structure changes or equipment migrates, the steps are repeated. The method has huge workload, especially for counting the electric equipment information of each branch line, the method not only consumes time and labor, but also can complete the counting at present, the position of the electric equipment moves in the next day, and the access line changes, so that the protection fixed value of the relay protection device in the monitoring system is disconnected with the actual protection fixed value to different degrees all the time.
Disclosure of Invention
Based on this, aiming at the technical problem, a relay protection fixed value updating method, equipment and a computer readable storage medium are provided.
The technical scheme adopted by the invention is as follows:
on one hand, the method for updating the protection constant value of the power grid relay protection device is characterized by comprising the following steps:
s110, calculating a current protection constant value of the target relay protection device:
s111) acquiring load characteristic data of a protection circuit corresponding to a target relay protection device, wherein the protection circuits corresponding to different relay protection devices are different calculation sections;
s112) inputting the load characteristic data into a pre-trained calculation section model corresponding to the target relay protection device to obtain Ieq、∑Ie、IL.max、∑INMAnd sigma INT；
S113) respectively calculating a current I section protection constant value, a current II section protection constant value and a current III section protection constant value of the target relay protection device:
A. and (3) current I section protection constant value calculation:
calculation according to the topology of the grid
Figure BDA0003260932170000021
And
Figure BDA0003260932170000022
z1 and Z2 are calculated by formula (1) and formula (2), respectively:
Figure BDA0003260932170000023
Figure BDA0003260932170000024
taking the maximum values from Z1 and Z2 asCurrent I section protection constant value
Figure BDA0003260932170000025
Wherein the content of the first and second substances,
Figure BDA0003260932170000026
representing the three-phase short-circuit current at the end of the protection line in maximum operation mode,
Figure BDA0003260932170000027
representing the two-phase short-circuit current at the head end of the protection line in the minimum operating mode,
Figure BDA0003260932170000028
representing the protection reliability coefficient of the I section of the target relay protection device,
Figure BDA0003260932170000029
representing the I-section protection sensitivity coefficient, CT, of the target relay protection deviceTransformation ratioThe current transformer is connected with the target relay protection device, and the primary side current and the secondary side current of the current transformer are in proportion.
B. And (3) calculating a protection constant value of the current II section:
z3 and Z4 are calculated by formula (3) and formula (4), respectively:
Figure BDA0003260932170000031
Figure BDA0003260932170000032
taking the maximum value from Z3 and Z4 as the protection constant value of the current II section
Figure BDA0003260932170000033
Wherein the content of the first and second substances,
Figure BDA0003260932170000034
representsReliable protection coefficient of II section of target relay protection device, IeqRepresents the rated starting current, Σ I, of the largest capacity motor in the protection circuiteRepresenting the sum of the rated currents of the other loads in the protection line,
Figure BDA0003260932170000035
representing the protection constant value of the current I section of the next adjacent protection circuit;
C. and (3) current III section protection constant value calculation:
z5 and Z6 are calculated by formula (5) and formula (6), respectively:
Figure BDA0003260932170000036
Figure BDA0003260932170000037
taking the maximum value from Z5 and Z6 as the protection constant value of the current III section
Figure BDA0003260932170000038
Wherein the content of the first and second substances,
Figure BDA0003260932170000039
representing the reliable protection coefficient of III section of the target relay protection device, KreRepresenting the return coefficient, I, of the target relay protection deviceL.maxRepresenting the sum of the maximum load currents in said protection circuit, KssRepresents the self-starting coefficient, sigma I of the target relay protection deviceNMRepresents the sum of rated currents, sigma I, of the high-voltage motor in the protection circuitNTRepresents the sum of rated currents of the primary sides of transformers in the protection circuit;
and S120, setting the current protection constant value of the target relay protection device in the power grid monitoring system as the current protection constant value obtained in the step S110.
In another aspect, an electronic device is provided, and includes a storage module, where the storage module includes instructions loaded and executed by a processor, and when the instructions are executed, the processor executes the protection fixed value updating method for a power grid relay protection device described above.
In still another aspect, a computer-readable storage medium is provided, which stores one or more programs, wherein the one or more programs, when executed by a processor, implement the protection fixed value updating method for a power grid relay protection device described above.
Compared with the traditional updating mode, the method saves the steps of inputting the performance parameters of cables and electrical elements, counting the electrical equipment information of each branch line and the like, can conveniently and efficiently calculate the current protection constant value of the target relay protection device, further updates, reduces the workload and improves the efficiency.
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The invention is described in detail below with reference to the following figures and detailed description:
FIG. 1 is a flow chart of the present invention;
fig. 2 is a flowchart of step S110 according to the present invention.
Detailed Description
As shown in fig. 1, an embodiment of the present specification provides a protection fixed value updating method for a power grid relay protection device, including:
s110, as shown in fig. 2, calculating a current protection constant value of the target relay protection device:
s111) obtaining load characteristic data of a protection circuit corresponding to the target relay protection device, wherein the protection circuits corresponding to different relay protection devices are different calculation sections.
Wherein the load characteristic data may be obtained from a grid monitoring system.
S112) inputting the load characteristic data into a pre-trained calculation section model corresponding to the target relay protection device to obtain model output: i iseq、∑Ie、IL.max、∑INMAnd sigma INT。
When calculating the current protection setting values of different relay protection devices, a calculation section model corresponding to the relay protection device needs to be used.
Respectively training each calculation section model through historical power grid characteristic data of the corresponding calculation section to obtain load characteristic data and I of the corresponding calculation sectioneq、∑Ie、IL.max、∑INMAnd sigma INTThe historical grid characteristic data comprises historical load characteristic data and corresponding Ieq、∑Ie、IL.max、∑INMSum Σ INT。
Wherein the load characteristic data includes a maximum load voltage, a minimum load voltage, a maximum load current, and a minimum load current of the respective calculation segment.
If the calculation section 1 model is trained, historical grid characteristic data of the calculation section 1 is needed to be calculated.
S113) respectively calculating a current I section protection constant value, a current II section protection constant value and a current III section protection constant value of the target relay protection device:
A. and (3) current I section protection constant value calculation:
a) according to the power grid topological structure calculation in the power grid monitoring system
Figure BDA0003260932170000041
And
Figure BDA0003260932170000042
b) z1 and Z2 are calculated by formula (1) and formula (2), respectively:
Figure BDA0003260932170000043
Figure BDA0003260932170000051
the fixed value Z1 obtained by the formula (1) is used for protecting the short-circuit fault at the tail end of the protection line in the maximum operation modeFor protection purposes, the fixed value Z2 obtained by the formula (2) is used for protecting the short-circuit fault of the first section of the protection line in the minimum operation mode, so the fixed values Z1 and Z2 need to be balanced to meet the two purposes, namely, taking the maximum value from Z1 and Z2 as the protection fixed value of the current I section
Figure BDA0003260932170000052
Wherein the content of the first and second substances,
Figure BDA0003260932170000053
representing the three-phase short-circuit current at the end of the protection line in the maximum operating mode,
Figure BDA0003260932170000054
representing two-phase short-circuit current at the head end of the protection line in the minimum operation mode,
Figure BDA0003260932170000055
representing the I section protection reliability coefficient of the target relay protection device, the value range is 1.2-1.3,
Figure BDA0003260932170000056
representing the I-section protection sensitivity coefficient of the target relay protection device, the value range is 1.5-2.0, and CTTransformation ratioFor the proportion of the primary side current and the secondary side current of the current transformer connected with the target relay protection device, when each relay protection device monitors a line, because the line current is too large, a current transformer is needed to change large current into small current.
In the present embodiment, it is preferred that,
Figure BDA0003260932170000057
B. and (3) calculating a protection constant value of the current II section:
z3 and Z4 are calculated by formula (3) and formula (4), respectively:
Figure BDA0003260932170000058
Figure BDA0003260932170000059
the fixed value Z3 obtained by the formula (3) is used for protecting the short-circuit fault at the end of the protection line, the fixed value Z4 obtained by the formula (4) is used for backup protection of the fault of the next adjacent line, and therefore the fixed values Z3 and Z4 need to be balanced to meet the two purposes, namely, taking the maximum value from Z3 and Z4 as the protection fixed value of the current II section
Figure BDA00032609321700000510
Wherein the content of the first and second substances,
Figure BDA00032609321700000511
representing the protection reliability coefficient of the II section of the target relay protection device, the value range is 1.1-1.2, and IeqRepresents the rated starting current, Σ I, of the largest capacity motor in the protection circuiteRepresenting the sum of the rated currents of other loads in the protection circuit,
Figure BDA00032609321700000512
the current I segment protection setpoint, which represents the next adjacent protection line, can be obtained from the grid monitoring system.
In the present embodiment, it is preferred that,
Figure BDA00032609321700000513
C. and (3) current III section protection constant value calculation:
z5 and Z6 are calculated by formula (5) and formula (6), respectively:
Figure BDA0003260932170000061
Figure BDA0003260932170000062
the fixed value Z5 obtained by the formula (5) is used for protecting overload faults of the protection line, the fixed value Z6 obtained by the formula (6) is used for backup protection of overcurrent faults of the next adjacent protection line, and therefore the fixed values Z5 and Z6 need to be weighed to meet the two purposes, namely, taking the maximum value from Z5 and Z6 as the protection fixed value of the current III section
Figure BDA0003260932170000063
Wherein the content of the first and second substances,
Figure BDA0003260932170000064
representing the III-section protection reliability coefficient of the target relay protection device, the value range is 1.15-1.25, and KreRepresenting the return coefficient, I, of the target relay protection deviceL.maxRepresenting the sum of the maximum load currents in the protection circuit, KssRepresenting the self-starting coefficient of the target relay protection device, and for the line of 6-10 kV, KssThe value range of (A) is 1.5-2.5, sigma INMRepresents the sum of rated currents, sigma I, of high-voltage motors in a protection circuitNTRepresenting the sum of the rated currents on the primary side of the transformer in the protection circuit.
In the present embodiment, it is preferred that,
Figure BDA0003260932170000065
Kre＝0.95。
in one embodiment, in order to meet the protection sensitivity requirement, sensitivity verification needs to be performed on the calculated current protection fixed value, and if the verification fails, the current protection fixed value is reversely deduced according to the lowest condition of the sensitivity verification.
Wherein, sensitivity check includes:
A. and (3) checking the sensitivity of the protection constant value of the current I section:
judging the protection constant value of the current I section
Figure BDA0003260932170000066
Whether or not to satisfy
Figure BDA0003260932170000067
If so, the verification is successful, otherwise, the verification fails.
B. And (3) checking the sensitivity of the protection constant value of the current II section:
judging current II section protection constant value
Figure BDA0003260932170000068
Whether or not:
when L is less than or equal to 20km,
Figure BDA0003260932170000069
when L is more than 20km and less than 50km,
Figure BDA00032609321700000610
l is more than or equal to 50km, is,
Figure BDA00032609321700000611
if so, the verification is successful, otherwise, the verification fails.
Wherein L represents the cable length of the protection line,
Figure BDA00032609321700000612
C. and (3) checking the sensitivity of the protection constant value of the current III section:
judging current III section protection constant value
Figure BDA00032609321700000613
Whether or not:
when L is less than or equal to 20km,
Figure BDA0003260932170000071
20km＜L＜50km,
Figure BDA0003260932170000072
L≥50km,
Figure BDA0003260932170000073
wherein L represents the cable length of the protection line,
Figure BDA0003260932170000074
taking sensitivity verification of current I section protection constant value as an example, when the verification fails, the current I section protection constant value passes
Figure BDA0003260932170000075
Reverse-deducing I-section protection constant value of current
Figure BDA0003260932170000076
S120, setting protection constant values of the current I section, the current II section and the current III section of the target relay protection device in the power grid monitoring system as the current protection constant values obtained in the step S110:
Figure BDA0003260932170000077
and
Figure BDA0003260932170000078
in one embodiment, the current protection setting of each relay protection device in the power grid may be periodically updated by:
and calculating the current protection fixed value of each relay protection device in the power grid at regular intervals.
And (5) taking the relay protection device with the current protection constant value to be calculated as a target relay protection device, and executing the step (S110).
In another embodiment, the current protection setting value of each relay protection device in the power grid can be triggered to be updated by a user:
responding to an opening instruction input by a user, and calculating a current protection fixed value of each relay protection device in the power grid;
and (5) taking the relay protection device with the current protection constant value to be calculated as a target relay protection device, and executing the step (S110).
As a preferable solution of the above two embodiments, in order to avoid unnecessary updating, step S120 further includes:
and comparing the current protection constant value obtained in the step S110 with the corresponding operation value of the target relay protection device, and reminding a user to update the protection constant value if the change exceeds a preset proportion range (such as 5-10%) of the operation value.
And setting the current protection constant value of the target relay protection device as the current protection constant value obtained in the step S110 in response to an updating instruction input by the user.
In another embodiment, the current protection constant value of the relay protection device may be updated by specifying the relay protection device by a user:
and responding to the relay protection device designated by the user, taking the relay protection device designated by the user as a target relay protection device, and executing the step S110.
Based on the same inventive concept, an embodiment of the present specification further provides an electronic device, including a storage module, where the storage module includes instructions loaded and executed by a processor, and the instructions, when executed, cause the processor to execute the steps according to the various exemplary embodiments of the present invention described in the above protection fixed value updating method section of the power grid relay protection device.
The memory module may include a readable medium in the form of a volatile memory unit, such as a random access memory unit (RAM) and/or a cache memory unit, and may further include a read only memory unit (ROM).
Based on the same inventive concept, embodiments of the present specification further provide a computer-readable storage medium storing one or more programs, which when executed by a processor, implement the steps according to various exemplary embodiments of the present invention described in the above section of the method for updating the protection fixed value of the power grid relay protection device.
A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a computer-readable storage medium include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
However, those skilled in the art should realize that the above embodiments are illustrative only and not limiting to the present invention, and that changes and modifications to the above described embodiments are intended to fall within the scope of the appended claims, provided they fall within the true spirit of the present invention.

Claims (10)

1. A protection constant value updating method of a power grid relay protection device is characterized by comprising the following steps:
s110, calculating a current protection constant value of the target relay protection device:
s111) acquiring load characteristic data of a protection circuit corresponding to a target relay protection device, wherein the protection circuits corresponding to different relay protection devices are different calculation sections;
s112) inputting the load characteristic data into a pre-trained calculation section model corresponding to the target relay protection device to obtain Ieq、∑Ie、IL.max、∑INMAnd sigma INT；
S113) respectively calculating a current I section protection constant value, a current II section protection constant value and a current III section protection constant value of the target relay protection device:
A. and (3) current I section protection constant value calculation:
calculation according to the topology of the grid
Figure FDA0003260932160000011
And
Figure FDA0003260932160000012
z1 and Z2 are calculated by formula (1) and formula (2), respectively:
Figure FDA0003260932160000013
Figure FDA0003260932160000014
taking the maximum value from Z1 and Z2 as the protection constant value of the current I section
Figure FDA0003260932160000015
Wherein the content of the first and second substances,
Figure FDA0003260932160000016
representing the three-phase short-circuit current at the end of the protection line in maximum operation mode,
Figure FDA0003260932160000017
representing the two-phase short-circuit current at the head end of the protection line in the minimum operating mode,
Figure FDA0003260932160000018
representing the protection reliability coefficient of the I section of the target relay protection device,
Figure FDA0003260932160000019
representing the I-section protection sensitivity coefficient, CT, of the target relay protection deviceTransformation ratio(is the proportion of the primary side and the secondary side of the current transformer connected with the target relay protection device;
B. and (3) calculating a protection constant value of the current II section:
z3 and Z4 are calculated by formula (3) and formula (4), respectively:
Figure FDA00032609321600000110
Figure FDA00032609321600000111
taking the maximum value from Z3 and Z4 as the protection constant value of the current II section
Figure FDA00032609321600000112
Wherein the content of the first and second substances,
Figure FDA00032609321600000113
representing the reliable protection coefficient of the II section of the target relay protection device, IeqRepresents the rated starting current, Σ I, of the largest capacity motor in the protection circuiteRepresenting the sum of the rated currents of the other loads in the protection line,
Figure FDA00032609321600000114
current I segment protection representing next adjacent protection lineFixing the value;
C. and (3) current III section protection constant value calculation:
z5 and Z6 are calculated by formula (5) and formula (6), respectively:
Figure FDA0003260932160000021
Figure FDA0003260932160000022
taking the maximum value from Z5 and Z6 as the protection constant value of the current III section
Figure FDA0003260932160000023
Wherein the content of the first and second substances,
Figure FDA0003260932160000024
representing the reliable protection coefficient of III section of the target relay protection device, KreRepresenting the return coefficient, I, of the target relay protection deviceL.maxRepresenting the sum of the maximum load currents in said protection circuit, KssRepresents the self-starting coefficient, sigma I of the target relay protection deviceNMRepresents the sum of rated currents, sigma I, of the high-voltage motor in the protection circuitNTRepresents the sum of rated currents of the primary sides of transformers in the protection circuit;
and S120, setting the current protection constant value of the target relay protection device in the power grid monitoring system as the current protection constant value obtained in the step S110.
2. The method for updating the protection constant value of the power grid relay protection device according to claim 1, further comprising:
calculating the current protection constant value of each relay protection device in the power grid at regular intervals;
and (5) taking the relay protection device with the current protection constant value to be calculated as a target relay protection device, and executing the step (S110).
3. The method for updating the protection constant value of the power grid relay protection device according to claim 1, further comprising:
responding to an opening instruction input by a user, and calculating a current protection fixed value of each relay protection device in the power grid;
and (5) taking the relay protection device with the current protection constant value to be calculated as a target relay protection device, and executing the step (S110).
4. The method for updating the protection constant value of the grid relay protection device according to claim 2 or 3, wherein the step S120 further comprises:
comparing the current protection constant value obtained in the step S110 with a corresponding operation value of the target relay protection device, and if the change exceeds a preset proportional range of the operation value, reminding a user to update the protection constant value;
and setting the current protection constant value of the target relay protection device as the current protection constant value obtained in the step S110 in response to an updating instruction input by the user.
5. The method for updating the protection constant value of the power grid relay protection device according to claim 1, further comprising:
and responding to the relay protection device designated by the user, taking the relay protection device designated by the user as a target relay protection device, and executing the step S110.
6. The method for updating the protection fixed value of the power grid relay protection device according to any one of claims 1 to 5, wherein the model of each calculation section is trained through historical power grid characteristic data of the corresponding calculation section to obtain load characteristic data and I of the corresponding calculation sectioneq、∑Ie、IL.max、∑INMAnd sigma INTThe historical grid characteristic data comprises historical load characteristic data and corresponding Ieq、∑Ie、IL.max、∑INMSum Σ INT。
7. The method for updating the protection constant value of the power grid relay protection device according to claim 6, wherein the load characteristic data comprises a maximum load voltage, a minimum load voltage, a maximum load current and a minimum load current of the corresponding calculation section.
8. The method for updating the protection fixed value of the grid relay protection device according to claim 7, wherein the step S113 further comprises:
carrying out sensitivity verification on the calculated current protection fixed value, and if the verification fails, reversely deducing the current protection fixed value according to the lowest condition of the sensitivity verification;
the sensitivity verification comprises:
A. and (3) checking the sensitivity of the protection constant value of the current I section:
judging the protection constant value of the current I section
Figure FDA0003260932160000031
Whether or not to satisfy
Figure FDA0003260932160000032
If so, the verification is successful, otherwise, the verification fails;
B. and (3) checking the sensitivity of the protection constant value of the current II section:
judging current II section protection constant value
Figure FDA0003260932160000041
Whether or not:
when L is less than or equal to 20km,
Figure FDA0003260932160000042
when L is more than 20km and less than 50km,
Figure FDA0003260932160000043
l is more than or equal to 50km, is,
Figure FDA0003260932160000044
if so, the verification is successful, otherwise, the verification fails;
wherein L represents a cable length of the protection line,
Figure FDA0003260932160000045
C. and (3) checking the sensitivity of the protection constant value of the current III section:
judging current III section protection constant value
Figure FDA0003260932160000046
Whether or not:
when L is less than or equal to 20km,
Figure FDA0003260932160000047
20km＜L＜50km,
Figure FDA0003260932160000048
L≥50km,
Figure FDA0003260932160000049
wherein L represents a cable length of the protection line,
Figure FDA00032609321600000410
9. an electronic device, comprising a storage module, wherein the storage module comprises instructions loaded and executed by a processor, and when executed, the instructions cause the processor to execute the protection fixed value updating method of the power grid relay protection device according to any one of claims 1 to 8.
10. A computer readable storage medium storing one or more programs, wherein the one or more programs, when executed by a processor, implement the protection fixed value updating method for a power grid relay protection device according to any one of claims 1 to 8.
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