CN109149533B - Method and system for calculating time delay of variable time-limit distance protection device - Google Patents
Method and system for calculating time delay of variable time-limit distance protection device Download PDFInfo
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- CN109149533B CN109149533B CN201810942754.7A CN201810942754A CN109149533B CN 109149533 B CN109149533 B CN 109149533B CN 201810942754 A CN201810942754 A CN 201810942754A CN 109149533 B CN109149533 B CN 109149533B
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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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- 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
Abstract
The invention discloses a method and a system for calculating time delay of a time-varying distance protection device, wherein the method comprises the following steps: obtaining the distance impedance from the installation position of the distance protection device to a fault point, and calculating the distance measurement of the distance protection by using the distance impedance; calculating the action time intermediate value of the distance protection according to the distance measurement of the distance protection; calculating the action time of the distance protection II section according to the distance measurement of the distance protection and the action time intermediate value; and calculating the action time of the distance protection III section according to the distance measurement of the distance protection and the action time intermediate value. The method and the system for calculating the time delay of the variable time limit distance protection device can automatically realize the automatic matching of the distance protection time limit, optimize the matching relation of the distance protection time limit and reduce the workload of distance protection setting calculation.
Description
Technical Field
The present invention relates to the technical field of power system relay protection, and more particularly, to a method and system for calculating a time delay of a variable time-limit distance protection device.
Background
The setting calculation and the correct fixed value are necessary conditions for ensuring the relay protection device to exert normal performance. Currently, the relay protection setting of the power grid includes line protection, bus protection, transformer protection, breaker protection, failure protection overvoltage, long trip protection and the like. The setting value of most of protection during the capital construction input can adapt to the local change of the power grid, and the setting value is not frequently changed generally. The distance protection of the line protection needs to be matched with the distance protection of the adjacent line, the related line needs to be recalculated with a fixed value in the process of breaking and building the power grid line and is issued to the related substation to change the fixed value, the distance protection setting calculation is complex, and the workload is large. In addition, due to inconsistency of the infrastructure project plan and implementation, the fixed value required to be changed cannot be put in place at one time, and the fixed value is often not matched in the changing process.
Therefore, if the automatic matching of the distance protection action time limit can be realized by using the computer technology, although the workload of the setting calculation of the line protection cannot be reduced, the distance protection can adapt to the local change of the power grid like other protections, and the adjacent lines generally do not need to change the fixed value except the fixed value of the disconnected or newly-built line. Meanwhile, since the conventional timing time limit of distance protection is matched, a non-matching point is set in a local place for the sake of the whole bureau. The automatic matching of the distance protection time limit always takes the fault point as the center, and meets the time matching between the distance protection of adjacent lines, so that the non-matching point can not occur. This is also an advantage of the automatic adaptation of the distance protection time limit.
Therefore, a method for calculating the time delay of the variable-time-limit distance protection device is needed to solve the problems that in the process of disconnecting and building a power grid line, a fixed value needs to be recalculated for a related line, the conventional fixed time limit of distance protection is complex to coordinate and set, and the change of the power grid is difficult to adapt.
Disclosure of Invention
The invention provides a method and a system for calculating time delay of a variable time-limit distance protection device, which are used for solving the problems that in the process of breaking and building a power grid line, a fixed value needs to be recalculated for a related line, the conventional fixed time limit of distance protection is complex to cooperate and set, and the change of a power grid is difficult to adapt.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method for calculating a delay time of a variable time-limit distance protection device, characterized in that the method comprises:
obtaining the distance impedance from the installation position of the distance protection device to a fault point, and calculating the distance measurement of the distance protection by using the distance impedance;
calculating the action time intermediate value of the distance protection according to the distance measurement of the distance protection;
calculating the action time of the distance protection II section according to the distance measurement of the distance protection and the intermediate value of the action time;
and calculating the action time of the distance protection III section according to the distance measurement of the distance protection and the action time intermediate value.
Preferably, wherein said calculating a range-protected range using said range impedance comprises:
C＝Z′K/zkm，
wherein, C is the distance measurement of distance protection; z'KA distance impedance from an installation of the protection system to a fault point; z is a radical ofkmIs the impedance value of the line per kilometer.
Preferably, the time intermediate value of the distance protection action comprises: a first time, a second time, a third time, and a fourth time.
Preferably, the motion time intermediate value of the distance protection is calculated by using the following formula:
t3＝0.3K1K2，
t4＝0.002(C/5)2，
wherein, t1Is a first time; t is t2A second time; t is t3Is the third time; t is t4Is the fourth time; c is distance measurement of distance protection; and L is the length of the local line at the distance protection installation position.
Preferably, the calculating the distance protection II segment action time according to the distance protection ranging and action time intermediate value comprises:
when C is more than or equal to 0 and less than or equal to 0.6L, tII＝t1；
When C is more than 0.6L and less than or equal to 1.1L,
when 1.1L is more than C and less than or equal to LII.set，
Wherein, tIIProtecting the action time of the II section for the distance; k0The time is a preset time range, and the unit is second; l isII.setFor distance protection II section impedance setting value ZII.setConverted into kilometers of the line.
Preferably, the calculating the distance protection III segment action time according to the distance protection ranging and action time intermediate value comprises:
when C is more than or equal to 0 and less than or equal to 0.6L, tIII＝t1+tmin；
When C is more than 0.6L and less than or equal to 1.1L,
when C is more than 1.1L and less than or equal to 1.4L,
when C is more than 1.4L and less than or equal to LIII.setWhen the temperature of the water is higher than the set temperature,
wherein, tIIIProtecting the action time of the section III for the distance; t is tminProtecting the minimum action time of the III section for a preset distance, wherein the unit is second; l isIII.setFor protecting III-section impedance setting value Z of distanceIII.setConverted into kilometers of the line.
According to another aspect of the present invention, there is provided a system for calculating a delay time of a variable time-limit distance protection device, characterized in that the system comprises:
the distance protection distance measurement calculation unit is used for acquiring distance impedance from the installation position of the distance protection device to a fault point and calculating distance measurement of distance protection by using the distance impedance;
the action time intermediate value calculating unit is used for calculating an action time intermediate value of the distance protection according to the distance measurement of the distance protection;
the distance protection II section action time calculation unit is used for calculating the distance protection II section action time according to the distance measurement of the distance protection and the action time intermediate value;
and the distance protection III-section action time calculating unit is used for calculating the distance protection III-section action time according to the distance measurement of the distance protection and the action time intermediate value.
Preferably, the calculating the range of the range protection using the range impedance at the range calculation unit of the range protection includes:
C＝Z′K/zkm，
wherein, C is the distance measurement of distance protection; z'KA distance impedance from an installation of the protection system to a fault point; z is a radical ofkmIs the impedance value of the line per kilometer.
Preferably, the time intermediate value of the distance protection action comprises: a first time, a second time, a third time, and a fourth time.
Preferably, in the action time intermediate value calculating unit, the action time intermediate value of the distance protection is calculated by using the following formula:
t3＝0.3K1K2，
t4＝0.002(C/5)2，
wherein, t1Is a first time; t is t2A second time; t is t3Is the third time; t is t4Is the fourth time; c is distance measurement of distance protection; and L is the length of the local line at the distance protection installation position.
Preferably, the calculating unit of the action time of the distance protection II segment, which calculates the action time of the distance protection II segment according to the intermediate value of the ranging and action time of the distance protection, includes:
when C is more than or equal to 0 and less than or equal to 0.6L, tII＝t1；
When C is more than 0.6L and less than or equal to 1.1L,
when 1.1L is more than C and less than or equal to LII.set，
Wherein, tIIProtecting the action time of the II section for the distance; k0The time is a preset time range, and the unit is second; l isII.setFor distance protection II section impedance setting value ZII.setConverted into kilometers of the line.
Preferably, the calculating unit of action time of segment III of distance protection calculates the action time of segment III of distance protection according to the intermediate value of ranging and action time of distance protection, and includes:
when C is more than or equal to 0 and less than or equal to 0.6L, tIII＝t1+tmin；
When C is more than 0.6L and less than or equal to 1.1L,
when C is more than 1.1L and less than or equal to 1.4L,
when C is more than 1.4L and less than or equal to LIII.setWhen the temperature of the water is higher than the set temperature,
wherein, tIIIProtecting the action time of the section III for the distance; t is tminProtecting the minimum action time of the III section for a preset distance, wherein the unit is second; l isIII.setFor protecting III-section impedance setting value Z of distanceIII.setConverted into kilometers of the line.
The invention provides a method and a system for calculating time delay of a time-limited distance protection device, which convert distance impedance from an installation position of the distance protection device to a fault point into kilometers of a line by using related parameters of the distance protection during line fault action, and obtain distance measurement of the distance protection; calculating a distance protection action time intermediate value according to the distance measurement of the distance protection; and calculating the action time of the distance protection II section and the action time of the distance protection III section according to the distance measurement result and the intermediate value of the distance protection action time, automatically realizing the automatic matching of the distance protection time limit, optimizing the matching relation of the distance protection time limit and reducing the workload of distance protection setting calculation.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow diagram of a method 100 for calculating a delay of a variable time-bounded distance protection device according to an embodiment of the invention;
FIG. 2 is a diagram of a verification model for variable time-limited distance protection according to an embodiment of the present invention; and
fig. 3 is a schematic diagram of a system 300 for calculating a delay time of a variable time-limit distance protection device according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method 100 for calculating a delay time of a variable time-limited distance protection device according to an embodiment of the present invention. As shown in fig. 1, in the method for calculating the delay of the variable time-limit distance protection device according to the embodiment of the present invention, the distance impedance from the installation location of the distance protection device to the fault point is converted into the kilometer number of the line by using the relevant parameters of the distance protection during the line fault operation, so as to obtain the distance measurement of the distance protection; calculating a distance protection action time intermediate value according to the distance measurement of the distance protection; and calculating the action time of the distance protection II section and the action time of the distance protection III section according to the distance measurement result and the intermediate value of the distance protection action time, automatically realizing the automatic matching of the distance protection time limit, optimizing the matching relation of the distance protection time limit and reducing the workload of distance protection setting calculation. The method 100 for calculating the time delay of a variable time-limit distance protection device provided by the embodiment of the invention starts from step 101, obtains the distance impedance from the fault point at the installation of the distance protection device at step 101, and calculates the distance measurement of the distance protection by using the distance impedance.
Preferably, wherein said calculating a range-protected range using said range impedance comprises:
C＝Z′K/zkm，
wherein C isDistance measurement of distance protection; z'KA distance impedance from an installation of the protection system to a fault point; z is a radical ofkmIs the impedance value of the line per kilometer.
Preferably, an action time intermediate value of the distance protection is calculated in step 102 based on the range of the distance protection. Preferably, the time intermediate value of the distance protection action comprises: a first time, a second time, a third time, and a fourth time.
Preferably, the motion time intermediate value of the distance protection is calculated by using the following formula:
t3＝0.3K1K2，
t4＝0.002(C/5)2，
wherein, t1Is a first time; t is t2A second time; t is t3Is the third time; t is t4Is the fourth time; c is distance measurement of distance protection; and L is the length of the local line at the distance protection installation position.
Preferably, the distance protection II segment action time is calculated in step 103 according to the ranging and action time intermediate value of the distance protection.
Preferably, the calculating the distance protection II segment action time according to the distance protection ranging and action time intermediate value comprises:
when C is more than or equal to 0 and less than or equal to 0.6L, tII＝t1；
When C is more than 0.6L and less than or equal to 1.1L,
when 1.1L is more than C and less than or equal to LII.set，
Wherein, tIIProtecting the action time of the II section for the distance; k0The time is a preset time range, and the unit is second; l isII.setFor distance protection II section impedance setting value ZII.setConverted into kilometers of the line.
Preferably, the distance protection III segment action time is calculated in step 104 according to the distance protection ranging and action time intermediate value.
Preferably, the calculating the distance protection III segment action time according to the distance protection ranging and action time intermediate value comprises:
when C is more than or equal to 0 and less than or equal to 0.6L, tIII＝t1+tmin；
When C is more than 0.6L and less than or equal to 1.1L,
when C is more than 1.1L and less than or equal to 1.4L,
when C is more than 1.4L and less than or equal to LIII.setWhen the temperature of the water is higher than the set temperature,
wherein, tIIIProtecting the action time of the section III for the distance; t is tminProtecting the minimum action time of the III section for a preset distance, wherein the unit is second; l isIII.setFor protecting III-section impedance setting value Z of distanceIII.setConverted into kilometers of the line.
In the embodiment of the present invention, first, the distance impedance from the protective installation site to the fault point is calculated as Z 'by the distance protection device'KAnd converting the converted data into a kilometer number C ═ Z 'of the line'K/zkmWherein z iskmImpedance value of each kilometer of the line; and C is a ranging result of the distance protection.
Secondly, calculating a distance protection action time intermediate value according to the distance measurement result C, comprising: a first time t1A second time t2A third time t3And a fourth time t4. Wherein the content of the first and second substances,
(1)t1the calculation formula is as follows:
(2)t2the calculation formula is as follows:
when t is2When > 0.5, t2＝0.5。
(3)t3The calculation formula is as follows: t is t3＝0.3K1K2；
(4)t4The calculation formula is as follows: t is t4＝0.002(C/5)2。
Then, according to the distance measurement result C and the action time intermediate value t1、t2、t3Calculating the action time t of the distance protection II sectionII. Wherein the content of the first and second substances,
(1) when C is more than or equal to 0 and less than or equal to 0.6L, tII＝t1。
Wherein, when t isIIWhen less than 0.2, let tII0.2; when t isIIWhen the value is more than 0.5, let tII＝0.5。
(2) When C is more than 0.6L and less than or equal to 1.1L,
wherein, when t isIIWhen less than 0.5, let tII0.5; when t isIIWhen greater than 2, let tII＝2。
(3) When 1.1L is more than C and less than or equal to LII.setWhen the temperature of the water is higher than the set temperature,
wherein, when t is3When greater than 1, let t31. When t isIIWhen the value is greater than 2.5, let tII＝2.5。
Finally, according to the distance measurement result C and the action time intermediate value t1、t2、t3、t4Calculating the action time t of the distance protection III sectionIII. Wherein the content of the first and second substances,
(1) when C is more than or equal to 0 and less than or equal to 0.6L, tIII＝t1+tmin。
When t isIII＜0.2+tminWhen t isIII＝0.2+tmin(ii) a When t isIII＞0.5+tminWhen t isIII＝0.5+tmin。
(2) When C is more than 0.6L and less than or equal to 1.1L,
when t isIII＜0.5+tminWhen t isIII＝0.5+tmin(ii) a When t isIII＞2+tminWhen t isIII＝2+tmin。
(3) When C is more than 1.1L and less than or equal to 1.4L,
when t is3When > 0.5, t30.5. When t isIIIAt > 10, tIII＝10。
(4) When C is more than 1.4L and less than or equal to LIII.setWhen the temperature of the water is higher than the set temperature,
when t isIIIAt > 20, tIII＝20。
Fig. 2 is a diagram of a verification model for variable time-limit distance protection according to an embodiment of the present invention. As shown in fig. 2, for the system M side in fig. 2 as the transmitting side N side as the receiving side, three fault points are set on the line L3, i.e., F1 is 1km from the head end (installation of protection 5), F2 is the line midpoint, and F3 is the line end.
A three-phase fault occurs at F1, and the protection action times of the distance protections 1, 3, 5 are calculated as shown in table 1.
TABLE 1 line L3 head end Fault along line distance protection action time
At F2, an a-phase grounding fault occurs, and the protection action times for distance protections 1, 3, 5 are calculated as shown in table 2.
TABLE 2 Point Fault along line distance protection action time in line L3
A phase-to-phase fault occurs at F3, and the protection action times of the distance protections 1, 3, 5 are calculated as shown in table 3.
TABLE 3 line L3 end fault along line distance protection action time
The results show that the time range difference between the protections is larger than 0.5s, the automatic matching of the protection action time can be realized, the matching relation of the distance protection time limit is optimized, and the workload of distance protection setting calculation is reduced.
Fig. 3 is a schematic diagram of a system 300 for calculating a delay time of a variable time-limit distance protection device according to an embodiment of the present invention. As shown in fig. 3, the system 300 for calculating the delay time of the variable time-limit distance protection device according to the embodiment of the present invention includes: a distance-protected ranging calculation unit 301, an action time intermediate value calculation unit 302, a distance-protected II-segment action time calculation unit 303, and a distance-protected III-segment action time calculation unit 304. Preferably, the distance protection ranging calculation unit 301 is configured to obtain a distance impedance from a fault point at an installation of the distance protection device, and calculate a ranging for distance protection using the distance impedance.
Preferably, the calculating the range of the range protection using the range impedance at the range calculation unit of the range protection includes:
C＝Z′K/zkm，
wherein, C is the distance measurement of distance protection; z'KA distance impedance from an installation of the protection system to a fault point; z is a radical ofkmIs the impedance value of the line per kilometer.
Preferably, the action time intermediate value calculating unit 302 is configured to calculate an action time intermediate value of distance protection according to the distance protected ranging.
Preferably, the time intermediate value of the distance protection action comprises: a first time, a second time, a third time, and a fourth time.
Preferably, in the action time intermediate value calculating unit, the action time intermediate value of the distance protection is calculated by using the following formula:
t3＝0.3K1K2，
t4＝0.002(C/5)2，
wherein, t1Is a first time; t is t2A second time; t is t3Is the third time; t is t4Is the fourth time; c is distance measurement of distance protection; and L is the length of the local line at the distance protection installation position.
Preferably, the distance protection II segment action time calculating unit 303 is configured to calculate a distance protection II segment action time according to a distance measurement and an action time intermediate value of the distance protection.
Preferably, wherein, in the distance protection II segment action time calculation unit 303, calculating the distance protection II segment action time according to the ranging and action time intermediate value of the distance protection comprises:
when C is more than or equal to 0 and less than or equal to 0.6L, tII＝t1(ii) a When C is more than 0.6L and less than or equal to 1.1L,
when 1.1L is more than C and less than or equal to LII.set，
Wherein, tIIProtecting the action time of the II section for the distance; k0The time is a preset time range, and the unit is second; l isII.setFor distance protection II section impedance setting value ZII.setConverted into kilometers of the line.
Preferably, the distance protection segment III action time calculating unit 304 is configured to calculate a distance protection segment III action time according to the distance protection ranging and action time intermediate value.
Preferably, the calculating unit of action time in segment III of distance protection calculates the action time in segment III of distance protection according to the intermediate value of ranging and action time of distance protection, and includes:
when C is more than or equal to 0 and less than or equal to 0.6L, tIII＝t1+tmin(ii) a When C is more than 0.6L and less than or equal to 1.1L,
when C is more than 1.1L and less than or equal to 1.4L,
when C is more than 1.4L and less than or equal to LIII.setWhen the temperature of the water is higher than the set temperature,
wherein, tminProtecting the minimum action time of the III section for a preset distance, wherein the unit is second; l isIII.setFor protecting III-section impedance setting value Z of distanceIII.setConverted into kilometers of the line.
The system 300 for calculating the delay time of the variable time limit distance protection device according to the embodiment of the present invention corresponds to the method 100 for calculating the delay time of the variable time limit distance protection device according to another embodiment of the present invention, and will not be described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (6)
1. A method for calculating a delay time of a variable time-limited distance protection device, the method comprising:
obtaining the distance impedance from the installation position of the distance protection device to a fault point, and calculating the distance measurement of the distance protection by using the distance impedance;
calculating the action time intermediate value of the distance protection according to the distance measurement of the distance protection;
calculating the action time of the distance protection II section according to the distance measurement of the distance protection and the intermediate value of the action time;
calculating the action time of the distance protection III section according to the distance measurement of the distance protection and the action time intermediate value;
wherein the time intermediate value of the distance protection action comprises: a first time, a second time, a third time, and a fourth time;
wherein, the calculating of the distance protection II section action time according to the distance protection distance measurement and the action time intermediate value comprises:
when C is more than or equal to 0 and less than or equal to 0.6L, tII＝t1；
When C is more than 0.6L and less than or equal to 1.1L,
when 1.1L is more than C and less than or equal to LII.set，
Wherein, tIIProtecting the action time of the II section for the distance; k0The time is a preset time range, and the unit is second; l isII.setFor distance protection II section impedance setting value ZII.setConverting into the kilometers of the line; c is distance measurement of distance protection; z is a radical ofkmImpedance value of each kilometer of the line; t is t1Is a first time; t is t2A second time; t is t3Is the third time; t is t4Is the fourth time; l is the length of the local line at the distance protection installation position;
the step of calculating the action time of the distance protection III section according to the distance protection distance measurement and action time intermediate value comprises the following steps:
when C is more than or equal to 0 and less than or equal to 0.6L, tIII＝t1+tmin；
When C is more than 0.6L and less than or equal to 1.1L,
when C is more than 1.1L and less than or equal to 1.4L,
when C is more than 1.4L and less than or equal to LIII.setWhen the temperature of the water is higher than the set temperature,
wherein, tIIIProtecting the action time of the section III for the distance; t is tminProtecting the minimum action time of the III section for a preset distance, wherein the unit is second; l isIII.setFor protecting III-section impedance setting value Z of distanceIII.setConverted into kilometers of the line.
2. The method of claim 1, wherein said calculating a range-protected range using said range impedance comprises:
C＝Z′K/zkm，
wherein, Z'KIs the distance impedance from the point of failure at which the protection system is installed.
3. The method of claim 1, wherein the median time to action value of the distance protection is calculated using the following formula:
t3＝0.3K1K2，
t4＝0.002(C/5)2。
4. a system for calculating a time delay of a variable time-limited distance protection device, the system comprising:
the distance protection distance measurement calculation unit is used for acquiring distance impedance from the installation position of the distance protection device to a fault point and calculating distance measurement of distance protection by using the distance impedance;
the action time intermediate value calculating unit is used for calculating an action time intermediate value of the distance protection according to the distance measurement of the distance protection;
the distance protection II section action time calculation unit is used for calculating the distance protection II section action time according to the distance measurement of the distance protection and the action time intermediate value;
the distance protection III-section action time calculating unit is used for calculating the distance protection III-section action time according to the distance measurement of the distance protection and the action time intermediate value;
wherein the time intermediate value of the distance protection action comprises: a first time, a second time, a third time, and a fourth time;
wherein, in the distance protection II-segment action time calculating unit, calculating the distance protection II-segment action time according to the distance measurement of the distance protection and the action time intermediate value, and the method comprises the following steps:
when C is more than or equal to 0 and less than or equal to 0.6L, tII＝t1；
When C is more than 0.6L and less than or equal to 1.1L,
when 1.1L is more than C and less than or equal to LII.set，
Wherein the content of the first and second substances,tIIprotecting the action time of the II section for the distance; k0The time is a preset time range, and the unit is second; l isII.setFor distance protection II section impedance setting value ZII.setConverting into the kilometers of the line; c is distance measurement of distance protection; z is a radical ofkmImpedance value of each kilometer of the line; t is t1Is a first time; t is t2A second time; t is t3Is the third time; t is t4Is the fourth time; l is the length of the local line at the distance protection installation position;
wherein, in the distance protection III-stage action time calculating unit, calculating the distance protection III-stage action time according to the distance measurement of the distance protection and the action time intermediate value, and the method comprises the following steps:
when C is more than or equal to 0 and less than or equal to 0.6L, tIII＝t1+tmin；
When C is more than 0.6L and less than or equal to 1.1L,
when C is more than 1.1L and less than or equal to 1.4L,
when C is more than 1.4L and less than or equal to LIII.setWhen the temperature of the water is higher than the set temperature,
wherein, tIIIProtecting the action time of the section III for the distance; t is tminProtecting the minimum action time of the III section for a preset distance, wherein the unit is second; l isIII.setFor protecting III-section impedance setting value Z of distanceIII.setConverted into kilometers of the line.
5. The system of claim 4, wherein calculating a range-protected range using the range impedance at the range-protected range calculation unit comprises:
C＝Z′K/zkm，
wherein, Z'KIs the distance impedance from the point of failure at which the protection system is installed.
6. The system according to claim 4, wherein in the action time intermediate value calculating unit, an action time intermediate value of the distance protection is calculated using the following formula:
t3＝0.3K1K2，
t4＝0.002(C/5)2。
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