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CN111711174B - Relay protection method for multi-stage switching station series connection traction network - Google Patents

Relay protection method for multi-stage switching station series connection traction network Download PDF

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CN111711174B
CN111711174B CN201911139724.3A CN201911139724A CN111711174B CN 111711174 B CN111711174 B CN 111711174B CN 201911139724 A CN201911139724 A CN 201911139724A CN 111711174 B CN111711174 B CN 111711174B
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CN111711174A (en
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韩正庆
何宗伦
沈睿
马战磊
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Southwest Jiaotong University
China State Railway Group Co Ltd
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China State Railway Group 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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders

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Abstract

本发明公开了一种多级开闭所串联牵引网的继电保护方法，牵引网由牵引变电所和n级开闭所串联进行供电，牵引变电所馈线与各级开闭所的进线和馈线都装设断路器；分别对变电所馈线、开闭所进线、前n‑1级开闭所馈线和第n级开闭所馈线进行保护整定计算；再按相应计算结果保护配置。本发明可以减少保护级数、缩短跳闸时间；具有成本低、实现简便等特点。

Figure 201911139724

The invention discloses a relay protection method for a traction network connected in series with multi-level switching stations. The traction network is powered by a traction substation and n-level switching stations connected in series. Circuit breakers are installed on both the feeder and the substation; the protection setting calculation is carried out for the feeder of the substation, the incoming line of the switch station, the feeder of the first n-1 switch station and the feeder of the nth switch station; and then the protection is performed according to the corresponding calculation results. configuration. The invention can reduce the number of protection levels, shorten the tripping time, and has the characteristics of low cost, simple realization and the like.

Figure 201911139724

Description

一种多级开闭所串联牵引网的继电保护方法A kind of relay protection method of traction network connected in series with multi-level opening and closing

技术领域technical field

本发明属于电网供电保护领域，具体涉及一种多级开闭所串联牵引网的继电保护方法。The invention belongs to the field of power supply protection of power grids, and in particular relates to a relay protection method for traction networks connected in series by multi-level switching.

背景技术Background technique

在铁路枢纽地区、大型车站和铁路支线引入处,由于供电单元较多,为了提高供电灵活性和可靠性,通常需要设置开闭所扩充馈线来供电，使得牵引网结构的日渐复杂，继电保护配合级数增多，保护速动性不易满足。In railway hub areas, large stations and the introduction of railway branch lines, due to the large number of power supply units, in order to improve the flexibility and reliability of power supply, it is usually necessary to set up open and close expansion feeders to supply power, which makes the structure of the traction network increasingly complex, and the relay protection With the increase of the number of cooperation stages, the protection quickness is not easy to meet.

对于多级开闭所串联牵引网的保护，当前工程应用中主要通过在牵引变电所馈线、各级开闭所进线、馈线处分别设置断路器，进行多级复杂的保护配合，为了满足保护之间动作的选择性而不能尽可能快速地切除故障；同样，由于保护配合较为复杂，在工程中会出现保护配合不当而造成越级跳闸的现象,扩大了停电范围,对现场运输秩序造成了很大影响。For the protection of the traction network connected in series with multi-level switching stations, circuit breakers are mainly installed at the feeders of traction substations, the incoming lines and feeders of the switching stations at all levels to carry out multi-level complex protection coordination. The selectivity of the actions between the protections cannot remove the fault as quickly as possible; also, due to the complex protection coordination, improper protection coordination may cause jump tripping in the project, which expands the scope of power outages and causes on-site transportation order. Great influence.

目前对多级开闭所串联牵引网的继电保护方法的研究屈指可数，仅有学者通过缩短保护动作延时对保护的速动性进行优化，并未从保护配置的层面上进行研究和分析。At present, there are only a handful of studies on the relay protection method of the traction network connected in series with multi-level switches. Only scholars optimize the quickness of the protection by shortening the protection action delay. analyze.

发明内容SUMMARY OF THE INVENTION

为了能够较好地解决当前工程应用中多级开闭所保护级数多、跳闸时间长等问题，本发明提供了一种多级开闭所串联牵引网的继电保护方法。In order to better solve the problems of multiple protection stages and long tripping time in current engineering applications, the present invention provides a relay protection method for a traction network connected in series with multistage switches.

本发明的一种多级开闭所串联牵引网的继电保护方法，牵引网由牵引变电所和n级开闭所串联进行供电，牵引变电所馈线与各级开闭所的进线和馈线都装设断路器；分别对变电所馈线、开闭所进线、前n-1级开闭所馈线和第n级开闭所馈线进行保护整定计算；再按相应计算结果保护配置。The invention provides a relay protection method for a traction network connected in series with a multi-level switch. Circuit breakers are installed on both the substation and the feeder; the protection setting calculation is performed for the feeder of the substation, the incoming line of the switch station, the feeder of the first n-1 level switch station and the feeder of the nth level switch station; and then the protection configuration is performed according to the corresponding calculation results. .

其中，变电所馈线保护配置为距离Ⅰ段、距离Ⅱ段、距离Ⅲ段、电流速断、低压起动过电流、电流增量和重合闸；Among them, the substation feeder protection configuration is distance I section, distance II section, distance III section, current quick-break, low-voltage starting overcurrent, current increment and reclosing;

其中，开闭所进线包括单进线运行和双进线并联，单进线运行保护配置为失压自投；双进线并联保护配置为距离Ⅰ段和检有压重合闸；Among them, the incoming line of the switch station includes single incoming line operation and double incoming line parallel connection, the single incoming line operation protection is configured as voltage loss automatic switching; the double incoming line parallel protection is configured as distance I section and pressure detection reclosing;

其中，前n-1级开闭所馈线保护配置为距离Ⅰ段、距离Ⅱ段、电流速断、低压起动过电流、电流增量和重合闸；Among them, the feeder protection configuration of the first n-1 level switching station is distance I section, distance section II, current quick-break, low-voltage starting overcurrent, current increment and reclosing;

其中，第n级开闭所馈线保护配置为距离Ⅰ段、距离Ⅱ段、低压起动过电流、电流增量和重合闸。Among them, the feeder protection configuration of the nth level switching station is distance I section, distance section II, low-voltage starting overcurrent, current increment and reclosing.

上述距离Ⅰ段保护整定计算为：The above-mentioned distance I protection setting calculation is as follows:

电抗定值计算公式为：The formula for calculating the fixed value of reactance is:

Figure BDA0002280584120000021
Figure BDA0002280584120000021

式中：Kk为可靠系数，在变电所馈线和前n-1级开闭所馈线整定计算时取0.85，在开闭所进线和第n级开闭所馈线计算时取1.5；L0为供电线长度，x0为供电线单位电抗，L1为接触网长度，x1为接触网单位电抗，nCT为电流互感器变比，nPT为电压互感器变比。In the formula: K k is the reliability coefficient, which is taken as 0.85 in the setting calculation of the feeder of the substation and the feeder of the first n-1 level switching station, and 1.5 when the inlet line of the switching station and the feeder of the nth level switching station are calculated; L 0 is the length of the power supply line, x 0 is the unit reactance of the power supply line, L 1 is the length of the catenary, x 1 is the unit reactance of the catenary, n CT is the transformation ratio of the current transformer, and n PT is the transformation ratio of the voltage transformer.

电阻定值计算公式为：The formula for calculating the resistance value is:

Figure BDA0002280584120000022
Figure BDA0002280584120000022

式中：Kk为可靠系数，取值为1.2，Umin为变电所或开闭所最低运行电压，Ifh.max为馈线的最大负荷电流，

Figure BDA0002280584120000023
为负荷阻抗角，
Figure BDA0002280584120000024
为线路阻抗角。In the formula: K k is the reliability coefficient, the value is 1.2, U min is the minimum operating voltage of the substation or switching station, I fh.max is the maximum load current of the feeder,
Figure BDA0002280584120000023
is the load impedance angle,
Figure BDA0002280584120000024
is the line impedance angle.

动作时限整定为0.1s。The action time limit is set to 0.1s.

上述变电所馈线的距离Ⅱ段保护整定计算为：The above-mentioned substation feeder distance Ⅱ section protection setting calculation is as follows:

电抗定值计算公式为：The formula for calculating the fixed value of reactance is:

Figure BDA0002280584120000025
Figure BDA0002280584120000025

式中：Kk为可靠系数，取值为0.85，Kf为分流系数，开闭所单进线运行取1，双进线并联取2；L2的取值为1级开闭所中最短线路的接触网长度，x2为1级开闭所接触网单位电抗；In the formula: K k is the reliability coefficient, the value is 0.85, K f is the shunt coefficient, the single input line of the switch station is 1, and the double input line is connected in parallel is 2; the value of L 2 is the shortest among the 1-level switch stations. The length of the catenary of the line, x 2 is the unit reactance of the catenary of the 1st-level opening and closing;

电阻定值与距离Ⅰ段电阻定值相同；The fixed value of resistance is the same as that of distance I section resistance;

动作时限与1级开闭所馈线距离Ⅰ段时限配合，整定为1级开闭所馈线距离Ⅰ段时限加上延时△T；The action time limit cooperates with the time limit of the first stage of the feeder distance from the first-level switching station, and is set to the first stage of the switching station feeder distance.

上述前n-1级开闭所馈线保护整定计算为：The above-mentioned first n-1 level switching station feeder protection setting calculation is:

Figure BDA0002280584120000026
Figure BDA0002280584120000026

式中：Kk为可靠系数，取值为1.5；Kf为分流系数，下一级开闭所单进线运行取1，双进线并联取2；L2的取值为下一级开闭所中最长线路的接触网长度值；In the formula: K k is the reliability coefficient, the value is 1.5; K f is the shunt coefficient, the next-level switching station single-line operation is 1, and the double-line parallel connection is 2; the value of L 2 is the next-level opening and closing. The catenary length value of the longest line in the closed house;

电阻定值与距离Ⅰ段电阻定值相同。The resistance setting value is the same as the resistance setting value of the distance I section.

动作时限与下一级开闭所馈线距离Ⅰ段时限配合，整定为下一级开闭所馈线距离Ⅰ段时限加上延时△T；The action time limit is coordinated with the time limit of the first stage of the feeder distance from the next level of opening and closing, and is set to the time limit of the first stage of the feeder distance of the next level of opening and closing plus the delay △T;

上述第n级开闭所馈线的距离Ⅱ段仅对复线牵引网设置，其保护整定计算为：The distance of the feeder line connected to the n-th stage opening and closing above is only set for the double-line traction network, and its protection setting is calculated as:

电抗定值整定公式为：The formula for setting the reactance value is:

Figure BDA0002280584120000031
Figure BDA0002280584120000031

式中：Kk为可靠系数，取1.2；In the formula: K k is the reliability coefficient, which is taken as 1.2;

电阻定值与距离Ⅰ段电阻定值相同。The resistance setting value is the same as the resistance setting value of the distance I section.

动作时限与分区所距离Ⅰ段时限配合，整定为分区所距离Ⅰ段时限加上延时△T；The action time limit is coordinated with the time limit of the first stage from the partition, and is set as the time limit of the first stage from the partition plus the delay △T;

上述距离Ⅲ段保护整定计算为：The above-mentioned distance Ⅲ section protection setting calculation is:

电抗定值计算公式为：The formula for calculating the fixed value of reactance is:

Figure BDA0002280584120000032
Figure BDA0002280584120000032

式中：Kk为可靠系数，取1.2，L3为1级开闭所中最长线路的接触网长度，x3为开闭所接触网单位电抗。In the formula: K k is the reliability coefficient, which is taken as 1.2, L 3 is the catenary length of the longest line in the 1-level switching station, and x 3 is the unit reactance of the catenary of the switching station.

电阻定值与距离Ⅰ段电阻定值相同。The resistance setting value is the same as the resistance setting value of the distance I section.

动作时限整定为距离Ⅱ段时限加上△T。The action time limit is set by adding △T to the time limit of distance II stage.

上述电流速断保护整定计算为：The above current quick-break protection setting calculation is:

动作电流整定公式为：The operating current setting formula is:

Figure BDA0002280584120000033
Figure BDA0002280584120000033

式中：Kk为可靠系数，取1.2；Id.max为开闭所馈线出口处故障时流经变电所或开闭所馈线断路器的最大短路电流。In the formula: K k is the reliability coefficient, which is taken as 1.2; I d.max is the maximum short-circuit current flowing through the substation or the feeder circuit breaker of the switch station when there is a fault at the outlet of the switch station.

按变电所或者此级开闭所馈线断路器处最大短路电流校验灵敏度，见公式(6)。Check the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the substation or this level of switching station, see formula (6).

Figure BDA0002280584120000034
Figure BDA0002280584120000034

式中：Id.b.max为变电所或者此级开闭所馈线断路器处故障的最大短路电流。In the formula: I dbmax is the maximum short-circuit current of the fault at the substation or the feeder circuit breaker of this level of switching.

若灵敏度不满足则不投入电流速断。If the sensitivity is not satisfied, the current quick-break will not be input.

动作时限整定为0.1s。The action time limit is set to 0.1s.

上述低压起动过电流保护整定计算为：The above low-voltage starting overcurrent protection setting calculation is:

动作电压整定公式为：The formula for setting the operating voltage is:

Figure BDA0002280584120000041
Figure BDA0002280584120000041

式中：Umin为变电所或者本级开闭所最低运行电压，Kk为可靠系数，取1.2。In the formula: U min is the minimum operating voltage of the substation or the switch station at the same level, and K k is the reliability coefficient, which is taken as 1.2.

动作电流整定公式为：The operating current setting formula is:

Figure BDA0002280584120000042
Figure BDA0002280584120000042

式中：Kk为可靠系数，取1.2；Klm为灵敏系数，取1.2，Ifh.max为馈线最大负荷电流，Id.min为单线时线路末端故障时的最小短路电流或者复线时分区所故障时流过变电所保护安装处的最小短路电流。In the formula: K k is the reliability coefficient, which is taken as 1.2; K lm is the sensitivity coefficient, which is taken as 1.2, I fh.max is the maximum load current of the feeder, and I d.min is the minimum short-circuit current at the end of the line when the single line is faulty or the partition when the double line is used. The minimum short-circuit current flowing through the protection installation of the substation when the station fails.

动作时限：在变电所与距离Ⅲ段动作时限相同；在前n-1级开闭所与距离Ⅱ段动作时限相同；在第n级开闭所，单线时与距离Ⅰ段动作时限相同，复线时与距离Ⅱ段动作时限相同。Action time limit: The action time limit of the substation and the distance stage III is the same; the action time limit of the first n-1 level switching station is the same as that of the distance stage II; When the line is doubled, the action time limit is the same as that of distance II.

上述电流增量保护整定计算为：The above current incremental protection setting calculation is:

动作电流整定公式为：The operating current setting formula is:

Figure BDA0002280584120000043
Figure BDA0002280584120000043

式中：Kk为可靠系数，取1.0；Ie.max为线路运行的最大功率电力机车或动车组的额定电流。In the formula: K k is the reliability coefficient, which is taken as 1.0; I e.max is the rated current of the maximum power electric locomotive or EMU running on the line.

动作时限：在变电所与距离Ⅲ段动作时限相同；在前n-1级开闭所与距离Ⅱ段动作时限相同；在第n级开闭所，单线时与距离Ⅰ段动作时限相同，复线时与距离Ⅱ段动作时限相同。Action time limit: The action time limit of the substation and the distance stage III is the same; the action time limit of the first n-1 level switching station is the same as that of the distance stage II; When the line is doubled, the action time limit is the same as that of distance II.

上述重合闸时限整定为2s；复归时限整定为20s。The above reclosing time limit is set to 2s; the reset time limit is set to 20s.

上述失压自投的电压定值整定为50V，动作时限整定为3s。The voltage setting value of the above-mentioned voltage-loss automatic switching is set to 50V, and the action time limit is set to 3s.

上述检有压重合闸的动作电压整定为70V；动作时限整定为3s。The action voltage of the above-mentioned detection voltage reclosing is set to 70V; the action time limit is set to 3s.

本发明的有益技术效果为：The beneficial technical effects of the present invention are:

本发明提出多级开闭所串联牵引网的优化保护方法，减少保护级数、缩短跳闸时间；The invention proposes an optimized protection method for a traction network connected in series with multi-stage opening and closing, so as to reduce the number of protection stages and shorten the tripping time;

本发明提出了针对多级开闭所串联牵引网的一整套保护配置及整定计算方法，可直接应用于工程实际；The invention proposes a complete set of protection configuration and setting calculation method for the traction network connected in series with multi-stage opening and closing, which can be directly applied to engineering practice;

本发明通过在已有保护装置中改变相应的软件功能即可实现该方法，具有成本低、实现简便等特点。The present invention can realize the method by changing the corresponding software function in the existing protection device, and has the characteristics of low cost, simple implementation and the like.

附图说明Description of drawings

图1为经n级开闭所供电示意图；Fig. 1 is a schematic diagram of power supply through n-level switching;

图2为经2级开闭所供电示意图。Figure 2 is a schematic diagram of the power supply through the 2-level switch.

具体实施方式Detailed ways

下面结合附图和具体实施例对本发明做进一步详细说明。The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

本发明的一种多级开闭所串联牵引网的继电保护方法，牵引网由牵引变电所和n级开闭所串联进行供电，供电示意图如图1所示。牵引变电所馈线与各级开闭所的进线和馈线都装设断路器，其对应的保护功能按表1配置。A relay protection method for a traction network connected in series with a multi-level switch of the present invention, the traction network is powered by a traction substation and an n-level switch in series, and a schematic diagram of the power supply is shown in Figure 1. The feeder of the traction substation and the incoming and feeder lines of the switching stations at all levels are equipped with circuit breakers, and their corresponding protection functions are configured according to Table 1.

表1经n级开闭所供电牵引网保护配置Table 1 Protection configuration of traction network powered by n-level switching

Figure BDA0002280584120000051
Figure BDA0002280584120000051

1.变电所馈线保护整定计算1. Substation feeder protection setting calculation

距离Ⅰ段distance I

电抗定值：按保护范围不超过1级开闭所整定，见公式(1)Reactance setting: set according to the protection range not exceeding the level 1 opening and closing, see formula (1)

Figure BDA0002280584120000052
Figure BDA0002280584120000052

式中：Kk—可靠系数，取0.85；L0—供电线长度，单位为千米(km)；x0—供电线单位电抗，单位为欧姆每千米(Ω/km)；L1—接触网长度，单位为千米(km)；x1—接触网单位电抗，单位为欧姆每千米(Ω/km)；nCT—电流互感器变比；nPT—电压互感器变比。In the formula: K k — reliability coefficient, take 0.85; L 0 — power supply line length, in kilometers (km); x 0 — power supply line unit reactance, in ohms per kilometer (Ω/km); L 1 — The length of the catenary, the unit is kilometers (km); x 1 - the unit reactance of the catenary, the unit is ohms per kilometer (Ω/km); n CT - the transformation ratio of current transformers; n PT - the transformation ratio of voltage transformers.

电阻定值：按躲过最小负荷阻抗整定，见公式(2)。Resistance setting: set according to the minimum load resistance, see formula (2).

Figure BDA0002280584120000053
Figure BDA0002280584120000053

式中：Kk—可靠系数，取1.2；Umin—变电所最低运行电压，单位为伏特(V)；Ixfahm.—馈线的最大负荷电流，单位为安培(A)；

Figure BDA0002280584120000061
—负荷阻抗角，单位为度(°)；
Figure BDA0002280584120000062
—线路阻抗角，单位为度(°)。Where: K k — reliability coefficient, take 1.2; U min — minimum operating voltage of substation, unit is volt (V); I xfahm. — maximum load current of feeder, unit is ampere (A);
Figure BDA0002280584120000061
— load impedance angle, in degrees (°);
Figure BDA0002280584120000062
— Line impedance angle, in degrees (°).

动作时限：一般整定为0.1s。Action time limit: generally set to 0.1s.

距离Ⅱ段distance Ⅱ

电抗定值：按保护范围不超过1级开闭所馈线距离Ⅰ段整定，见公式(3)。Reactance setting: set according to the protection range not exceeding the first stage of the feeder distance between the opening and closing, see formula (3).

Figure BDA0002280584120000063
Figure BDA0002280584120000063

式中：Kk—可靠系数，取0.85；L1—变电所到1级开闭所的接触网长度，单位为千米(km)；Kf—分流系数，1级开闭所单进线运行取1，双进线并联取2；L2—1级开闭所中最短线路的接触网长度，单位为千米(km)；x2—1级开闭所接触网单位电抗，单位为欧姆每千米(Ω/km)。In the formula: K k — reliability factor, to be taken as 0.85; L 1 — catenary length from the substation to the first-level opening and closing station, the unit is km (km); K f — the shunt coefficient, the first-level opening and closing station is single input Take 1 for line operation, and take 2 for double incoming lines in parallel; L 2 - the length of the catenary of the shortest line in the level 1 opening and closing station, the unit is km (km); x 2 - the unit reactance of the catenary in the level 1 opening and closing station, the unit In ohms per kilometer (Ω/km).

电阻定值：与距离Ⅰ段电阻定值相同。Resistance setting: the same as the resistance setting of distance I section.

动作时限：与1级开闭所馈线距离Ⅰ段时限配合，整定为1级开闭所馈线距离Ⅰ段时限加上△T。Action time limit: Cooperate with the time limit of the first stage of the feeder distance from the 1st-level opening and closing station, and set it as the first stage of the opening and closing of the feeder distance. The first stage time limit plus △T.

距离Ⅲ段distance Ⅲ

电抗定值：按为1级开闭所馈线提供完全远后备整定，见公式(4)。Reactance setting: according to providing complete remote backup setting for the feeder of the 1st-level switch, see formula (4).

Figure BDA0002280584120000064
Figure BDA0002280584120000064

式中：Kk—可靠系数，取1.2；L3—1级开闭所中最长线路的接触网长度，单位为千米(km)；x3—1级开闭所接触网单位电抗，单位为欧姆每千米(Ω/km)。In the formula: K k — reliability coefficient, take 1.2; L 3 — catenary length of the longest line in the level 1 opening and closing station, the unit is kilometer (km); x 3 — the unit reactance of the catenary of the level 1 opening and closing station, The unit is ohms per kilometer (Ω/km).

电阻定值：与距离Ⅰ段电阻定值相同。Resistance setting: the same as the resistance setting of distance I section.

动作时限：与1级开闭所馈线距离Ⅱ段时限配合，整定为1级开闭所馈线距离Ⅱ段时限加上△T。Action time limit: Cooperate with the time limit of the second stage of the feeder distance from the first-level opening and closing station, and set it as the second stage time limit of the feeder distance of the first-level opening and closing station plus △T.

电流速断Current quick break

动作电流：按躲过1级开闭所馈线出口处最大短路电流整定，见公式(5)。Operating current: Set according to the maximum short-circuit current at the outlet of the feeder that escapes the first-level switch, see formula (5).

Figure BDA0002280584120000065
Figure BDA0002280584120000065

式中：Kk—可靠系数，取1.2；Id.max—1级开闭所馈线出口处故障时流经变电所馈线断路器的最大短路电流，单位为安培(A)。Where: K k —reliability factor, to be taken as 1.2; I d.max —maximum short-circuit current flowing through the feeder circuit breaker of the substation when there is a fault at the outlet of the feeder of the 1st-level switching station, the unit is ampere (A).

按变电所馈线断路器处最大短路电流校验灵敏度，见公式(6)。Check the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the substation, see formula (6).

Figure BDA0002280584120000071
Figure BDA0002280584120000071

式中：Id.b.max—变电所馈线断路器处故障的最大短路电流，单位为安培(A)。In the formula: I dbmax - the maximum short-circuit current of the fault at the feeder circuit breaker of the substation, the unit is ampere (A).

若灵敏度不满足可不投入电流速断。If the sensitivity is not satisfied, the current quick-break is not required.

动作时限：一般整定为0.1s。Action time limit: generally set to 0.1s.

低压起动过电流Low voltage starting overcurrent

动作电压：按躲过最低运行电压整定，见公式(7)。Operating voltage: Set by avoiding the minimum operating voltage, see formula (7).

Figure BDA0002280584120000072
Figure BDA0002280584120000072

式中：Kk—可靠系数，取1.2。In the formula: K k - reliability coefficient, take 1.2.

动作电流：按躲过馈线最大负荷电流并保证末端故障有足够灵敏度整定，见公式(8)。Operating current: Set according to avoiding the maximum load current of the feeder and ensuring that the terminal fault has sufficient sensitivity, see formula (8).

Figure BDA0002280584120000073
Figure BDA0002280584120000073

式中：Kk—可靠系数，取1.2；Klm—灵敏系数，一般取1.2；Id.min—线路末端故障时的最小短路电流(单线)，分区所故障时流过变电所保护安装处的最小短路电流(复线)，单位为安培(A)。In the formula: K k - reliability coefficient, take 1.2; K lm - sensitivity coefficient, generally take 1.2; I d.min - the minimum short-circuit current (single line) when the line end fails, which flows through the substation protection installation when the substation fails Minimum short-circuit current (double line) at , in amperes (A).

动作时限：与距离Ⅲ段动作时限相同。Action time limit: the same as the action time limit of distance III stage.

电流增量current increment

动作电流：按躲过线路负荷电流一个工频周期内最大增量整定，一般按单列电力机车或动车组额定电流估算，见公式(9)。Operating current: Set according to the maximum increment in one power frequency cycle to avoid the line load current, generally estimated according to the rated current of a single-train electric locomotive or EMU, see formula (9).

Figure BDA0002280584120000074
Figure BDA0002280584120000074

式中：Kk—可靠系数，一般取1.0；Ie.max—线路运行的最大功率电力机车或动车组的额定电流，单位为安培(A)。In the formula: K k — reliability coefficient, generally taken as 1.0; I e.max — rated current of the maximum power electric locomotive or EMU running on the line, in ampere (A).

动作时限：与距离Ⅲ段动作时限相同。Action time limit: the same as the action time limit of distance III stage.

重合闸Reclosing

重合闸时限：一般整定为2s；复归时限：一般整定为20s。Reclosing time limit: generally set to 2s; reset time limit: generally set to 20s.

2.开闭所馈线保护整定计算2. Calculation of the setting calculation of the feeder protection of the opening and closing

前n-1级开闭所馈线保护：Feeder protection of the first n-1 level switching station:

距离Ⅰ段distance I

电抗定值：按保护范围不超过下一级开闭所整定，同公式(1)。式中，L0取到下一级开闭所供电线长度值；L1取到下一级开闭所接触网长度值。Reactance setting: set according to the protection range not exceeding the next level of opening and closing, the same as formula (1). In the formula, L 0 takes the length value of the power line provided by the next level of opening and closing; L 1 takes the length of the catenary of the next level of opening and closing.

电阻定值：按躲过最小负荷阻抗整定，同公式(2)。Resistance setting: setting according to the resistance to avoid the minimum load, the same as formula (2).

动作时限：一般整定为0.1s。Action time limit: generally set to 0.1s.

距离Ⅱ段distance Ⅱ

电抗定值：按为下一级开闭所馈线提供远后备整定，公式为：Reactance setting: according to provide remote backup setting for the feeder of the next level switch, the formula is:

Figure BDA0002280584120000081
Figure BDA0002280584120000081

式中：Kk为可靠系数，取值为1.5；Kf为分流系数，下一级开闭所单进线运行取1，双进线并联取2；L2的取值为下一级开闭所中最长线路的接触网长度值。In the formula: K k is the reliability coefficient, the value is 1.5; K f is the shunt coefficient, the next-level switching station single-line operation is 1, and the double-line parallel connection is 2; the value of L 2 is the next-level opening and closing. The catenary length value of the longest line in the closed house.

电阻定值：与距离Ⅰ段电阻定值相同。Resistance setting: the same as the resistance setting of distance I section.

动作时限：与下一级开闭所馈线距离Ⅰ段时限配合，整定为下一级开闭所馈线距离Ⅰ段时限加上△T。Action time limit: Cooperate with the time limit of the first stage of the feeder distance of the next level of opening and closing, and set it as the time limit of the first stage of the feeder distance of the next level of opening and closing plus △T.

电流速断Current quick break

动作电流：按躲过下一级开闭所馈线出口处最大短路电流整定，同公式(5)。Operating current: Set according to the maximum short-circuit current at the outlet of the feeder that escapes the next-level switch, the same as formula (5).

按此级开闭所馈线断路器处最大短路电流校验灵敏度，同公式(6)。Check the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of this level of switching, the same as formula (6).

动作时限：一般整定为0.1s。Action time limit: generally set to 0.1s.

低压起动过电流Low voltage starting overcurrent

动作电压：按躲过最低运行电压整定，同公式(7)。Operating voltage: Set by avoiding the minimum operating voltage, same as formula (7).

动作电流：按躲过馈线最大负荷电流并保证末端故障有足够灵敏度整定，同公式(8)。Operating current: Set according to avoiding the maximum load current of the feeder and ensuring that the terminal fault has sufficient sensitivity, the same as formula (8).

动作时限：与距离Ⅱ段动作时限相同。Action time limit: the same as the action time limit of distance Ⅱ stage.

电流增量current increment

动作电流按式(9)计算。The operating current is calculated according to formula (9).

动作时限：与距离Ⅱ段动作时限相同。Action time limit: the same as the action time limit of distance Ⅱ stage.

重合闸Reclosing

重合闸时限：一般整定为2s；复归时限：一般整定为20s。Reclosing time limit: generally set to 2s; reset time limit: generally set to 20s.

第n级开闭所馈线保护：Feeder protection of the nth level switching station:

距离Ⅰ段distance I

电抗定值：对于单线结构牵引网，按保护线路全长整定，同公式(1)。式中：可靠系数Kk取1.5。Reactance setting: For single-line structure traction network, set according to the full length of the protection line, the same as formula (1). In the formula: the reliability coefficient K k is taken as 1.5.

对于复线结构牵引网，按保护范围不超过分区所断路器整定，式(1)中Kk取0.85。For the double-line structure traction network, according to the protection range not exceeding the setting of the circuit breaker of the partition, K k in the formula (1) is taken as 0.85.

为保证短线路故障可靠跳闸，电抗定值的一次值一般不应小于2Ω。In order to ensure reliable tripping of short-circuit faults, the primary value of the reactance setting should generally not be less than 2Ω.

电阻定值：按躲过最小负荷阻抗整定，见公式(2)。式中：可靠系数Kk取1.2；Umin取第n级开闭所最低运行电压值。Resistance setting: set according to the minimum load resistance, see formula (2). In the formula: the reliability coefficient K k takes 1.2; U min takes the minimum operating voltage value of the nth level switch.

动作时限：一般整定为0.1s。Action time limit: generally set to 0.1s.

距离Ⅱ段(仅对复线牵引网设置)Distance Section II (Only set for double-track traction network)

电抗定值：对于复线结构牵引网，按保护上下行全长整定，具体为Reactance setting: For the traction network with double-line structure, it is set according to the full length of the protection up and down, specifically:

Figure BDA0002280584120000091
Figure BDA0002280584120000091

式中：Kk取1.2。In the formula: K k is taken as 1.2.

电阻定值：与距离Ⅰ段电阻定值相同。Resistance setting: the same as the resistance setting of distance I section.

动作时限：与分区所距离Ⅰ段时限配合，整定为分区所距离Ⅰ段时限加上△T。Action time limit: In coordination with the time limit of the first section of the partition, it is set as the time limit of the first section of the partition plus △T.

低压起动过电流Low voltage starting overcurrent

动作电压：按躲过最低运行电压整定，同公式(7)。式中：Umin取n级开闭所最低运行电压值；Kk取1.2。Operating voltage: Set by avoiding the minimum operating voltage, same as formula (7). In the formula: U min takes the minimum operating voltage value of the n-level switching station; K k takes 1.2.

动作电流：按躲过馈线最大负荷电流并保证末端故障有足够灵敏度整定，同公式(8)。式中：Kk取1.2。Operating current: Set according to avoiding the maximum load current of the feeder and ensuring that the terminal fault has sufficient sensitivity, the same as formula (8). In the formula: K k is taken as 1.2.

动作时限：与距离Ⅰ段动作时限相同(单线)，与距离Ⅱ段动作时限相同(复线)。Action time limit: the same as the action time limit of distance I stage (single line), and the same as the action time limit of distance II stage (double line).

电流增量current increment

动作电流按式(9)计算。The operating current is calculated according to formula (9).

动作时限：与距离Ⅰ段动作时限相同(单线)，与距离Ⅱ段动作时限相同(复线)。Action time limit: the same as the action time limit of distance I stage (single line), and the same as the action time limit of distance II stage (double line).

重合闸Reclosing

重合闸时限：一般整定为2s；复归时限：一般整定为20s。Reclosing time limit: generally set to 2s; reset time limit: generally set to 20s.

3.开闭所进线保护整定计算(单进线运行)3. Calculation of incoming line protection setting calculation of opening and closing station (single incoming line operation)

失压自投的电压定值一般整定为50V，动作时限一般整定为3s。The voltage setting value of the voltage-loss automatic switching is generally set to 50V, and the action time limit is generally set to 3s.

4.开闭所进线保护整定计算(双进线并联)4. Setting calculation of incoming line protection of opening and closing station (double incoming lines in parallel)

距离Ⅰ段distance I

电抗定值：按保护进线全长整定，同公式(1)。式中：Kk取1.5。Reactance setting: set according to the full length of the protection incoming line, the same as formula (1). In the formula: K k is taken as 1.5.

电阻定值：按躲过最小负荷阻抗整定，同公式(2)。Resistance setting: setting according to the resistance to avoid the minimum load, the same as formula (2).

动作时限：一般整定为0.1s。Action time limit: generally set to 0.1s.

检有压重合闸Check pressure recloser

动作电压：整定为70V；动作时限：整定为3s。Action voltage: set to 70V; action time limit: set to 3s.

实施例以2级开闭所供电为例，供电示意图如图2所示，保护功能按表2配置。The embodiment takes the power supply of a 2-level switch as an example. The schematic diagram of the power supply is shown in FIG. 2 , and the protection functions are configured according to Table 2.

表1经2级开闭所供电牵引网保护配置Table 1 Protection configuration of traction network powered by 2-level switch

Figure BDA0002280584120000101
Figure BDA0002280584120000101

变电所馈线保护整定计算Substation Feeder Protection Setting Calculation

距离Ⅰ段distance I

电抗定值：按保护范围不超过1级开闭所整定Reactance setting: set according to the protection range not exceeding the level 1 opening and closing

Figure BDA0002280584120000111
Figure BDA0002280584120000111

电阻定值：按躲过最小负荷阻抗整定Resistance setting: set according to the minimum load resistance to avoid

Figure BDA0002280584120000112
Figure BDA0002280584120000112

动作时限：整定为0.1s。Action time limit: set to 0.1s.

距离Ⅱ段distance Ⅱ

电抗定值：按保护范围不超过1级开闭所馈线距离Ⅰ段整定。Reactance setting: set according to the protection range of no more than the first stage of the feeder distance between the opening and closing.

Figure BDA0002280584120000113
Figure BDA0002280584120000113

电阻定值：与距离Ⅰ段电阻定值相同。Resistance setting: the same as the resistance setting of distance I section.

动作时限：整定为0.2s。Action time limit: set to 0.2s.

距离Ⅲ段distance Ⅲ

电抗定值：按为1级开闭所馈线提供完全远后备整定。Reactance setting: According to provide full back-up setting for the feeder of Class 1 switch.

Figure BDA0002280584120000114
Figure BDA0002280584120000114

电阻定值：与距离Ⅰ段电阻定值相同。Resistance setting: the same as the resistance setting of distance I section.

动作时限：整定为0.3s。Action time limit: set to 0.3s.

电流速断Current quick break

动作电流：按躲过1级开闭所馈线出口处最大短路电流整定。Operating current: set according to the maximum short-circuit current at the outlet of the feeder that escapes the level 1 switch.

Figure BDA0002280584120000115
Figure BDA0002280584120000115

按变电所馈线断路器处最大短路电流校验灵敏度，见公式。Check the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the substation, see the formula.

Figure BDA0002280584120000116
Figure BDA0002280584120000116

动作时限：整定为0.1s。Action time limit: set to 0.1s.

低压起动过电流Low voltage starting overcurrent

动作电压：按躲过最低运行电压整定。Operating voltage: Set by avoiding the minimum operating voltage.

Figure BDA0002280584120000121
Figure BDA0002280584120000121

动作电流：按躲过馈线最大负荷电流并保证末端故障有足够灵敏度整定。Operating current: Set according to avoiding the maximum load current of the feeder and ensuring that the terminal fault has sufficient sensitivity.

Figure BDA0002280584120000122
Figure BDA0002280584120000122

动作时限：整定为0.3s。Action time limit: set to 0.3s.

电流增量current increment

动作电流：按躲过线路负荷电流一个工频周期内最大增量整定，按单列电力机车或动车组额定电流估算。Operating current: Set according to the maximum increment in one power frequency cycle to avoid the line load current, and estimate according to the rated current of a single-train electric locomotive or EMU.

Figure BDA0002280584120000123
Figure BDA0002280584120000123

动作时限：整定为0.3s。Action time limit: set to 0.3s.

重合闸Reclosing

重合闸时限：整定为2s；复归时限：整定为20s。Reclosing time limit: set to 2s; reset time limit: set to 20s.

1级开闭所馈线保护整定计算Calculation of Feeder Protection Setting Calculation of Class 1 Switching Station

距离Ⅰ段distance I

电抗定值：按保护范围不超过2级开闭所整定。Reactance setting: It is set according to the protection range not exceeding 2 levels of opening and closing.

Figure BDA0002280584120000124
Figure BDA0002280584120000124

电阻定值：按躲过最小负荷阻抗整定。Resistance setting: set according to the minimum load resistance.

Figure BDA0002280584120000125
Figure BDA0002280584120000125

动作时限：整定为0.1s。Action time limit: set to 0.1s.

距离Ⅱ段distance Ⅱ

电抗定值：按为2级开闭所馈线提供远后备整定。Reactance setting: according to provide remote backup setting for the feeder of the 2-level switch.

Figure BDA0002280584120000126
Figure BDA0002280584120000126

电阻定值：与距离Ⅰ段电阻定值相同。Resistance setting: the same as the resistance setting of distance I section.

动作时限：整定为0.2s。Action time limit: set to 0.2s.

电流速断Current quick break

动作电流：按躲过2级开闭所馈线出口处最大短路电流整定。Operating current: Set according to the maximum short-circuit current at the outlet of the feeder that escapes the 2-level switch.

Figure BDA0002280584120000131
Figure BDA0002280584120000131

按1级开闭所馈线断路器处最大短路电流校验灵敏度。Check the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the Class 1 switch.

Figure BDA0002280584120000132
Figure BDA0002280584120000132

动作时限：整定为0.1s。Action time limit: set to 0.1s.

低压起动过电流Low voltage starting overcurrent

动作电压：按躲过最低运行电压整定。Operating voltage: Set by avoiding the minimum operating voltage.

Figure BDA0002280584120000133
Figure BDA0002280584120000133

动作电流：按躲过馈线最大负荷电流并保证末端故障有足够灵敏度整定。Operating current: Set according to avoiding the maximum load current of the feeder and ensuring that the terminal fault has sufficient sensitivity.

Figure BDA0002280584120000134
Figure BDA0002280584120000134

动作时限：整定为0.2s。Action time limit: set to 0.2s.

电流增量current increment

动作电流：按躲过线路负荷电流一个工频周期内最大增量整定，按单列电力机车或动车组额定电流估算。Operating current: Set according to the maximum increment in one power frequency cycle to avoid the line load current, and estimate according to the rated current of a single-train electric locomotive or EMU.

Figure BDA0002280584120000135
Figure BDA0002280584120000135

动作时限：整定为0.2s。Action time limit: set to 0.2s.

重合闸Reclosing

重合闸时限：整定为2s；复归时限：整定为20s。Reclosing time limit: set to 2s; reset time limit: set to 20s.

2级开闭所馈线保护整定计算Calculation of Feeder Protection Setting Calculation of Class 2 Switching Station

距离Ⅰ段distance I

电抗定值：按保护线路全长整定。Reactance setting: set according to the full length of the protection line.

Figure BDA0002280584120000141
Figure BDA0002280584120000141

电抗定值的一次值应大于2Ω。The primary value of the reactance setting should be greater than 2Ω.

电阻定值：按躲过最小负荷阻抗整定。Resistance setting: set according to the minimum load resistance.

Figure BDA0002280584120000142
Figure BDA0002280584120000142

动作时限：整定为0.1s。Action time limit: set to 0.1s.

低压起动过电流Low voltage starting overcurrent

动作电压：按躲过最低运行电压整定。Operating voltage: Set by avoiding the minimum operating voltage.

Figure BDA0002280584120000143
Figure BDA0002280584120000143

动作电流：按躲过馈线最大负荷电流并保证末端故障有足够灵敏度整定，见公式Operating current: Set according to avoiding the maximum load current of the feeder and ensuring that the terminal fault has sufficient sensitivity, see the formula

Figure BDA0002280584120000144
Figure BDA0002280584120000144

动作时限：整定为0.1s。Action time limit: set to 0.1s.

电流增量current increment

动作电流：按躲过线路负荷电流一个工频周期内最大增量整定，按单列电力机车或动车组额定电流估算。Operating current: Set according to the maximum increment in one power frequency cycle to avoid the line load current, and estimate according to the rated current of a single-train electric locomotive or EMU.

Figure BDA0002280584120000145
Figure BDA0002280584120000145

动作时限：整定为0.1s。Action time limit: set to 0.1s.

重合闸Reclosing

重合闸时限：整定为2s；复归时限：整定为20s。Reclosing time limit: set to 2s; reset time limit: set to 20s.

开闭所进线保护整定计算(单进线运行)Switching station incoming line protection setting calculation (single incoming line operation)

失压自投的电压定值整定为50V，动作时限整定为3s。The voltage setting of the voltage-loss automatic switching is set to 50V, and the action time limit is set to 3s.

开闭所进线保护整定计算(双进线并联)Switching station incoming line protection setting calculation (double incoming lines in parallel)

距离Ⅰ段distance I

电抗定值：按保护进线全长整定。Reactance setting: set according to the full length of the protection incoming line.

Figure BDA0002280584120000151
Figure BDA0002280584120000151

电阻定值：按躲过最小负荷阻抗整定，。Resistance setting: set according to the minimum load impedance to avoid.

Figure BDA0002280584120000152
Figure BDA0002280584120000152

动作时限：整定为0.1s。Action time limit: set to 0.1s.

检有压重合闸Check pressure recloser

动作电压：整定为70V；动作时限：整定为3s。Action voltage: set to 70V; action time limit: set to 3s.

Claims (1)

1. A relay protection method for a multi-stage switching station series connection traction network is characterized in that the traction network is powered by a traction substation and n-stage switching stations in series connection, and circuit breakers are arranged on feeder lines of the traction substation and inlet lines and feeder lines of the switching stations at all stages; respectively carrying out protection setting calculation on a substation feeder line, a switching station incoming line, a front n-1-level switching station feeder line and an nth-level switching station feeder line; then protection configuration is carried out according to corresponding calculation results;
the protection configuration of the feeder line of the substation is distance I section, distance II section, distance III section, current quick break, low-voltage starting overcurrent, current increment and reclosing;
The inlet wire of the switching station comprises single inlet wire operation and double inlet wire parallel connection, and the single inlet wire operation protection configuration is voltage-loss automatic switching; the double-inlet-wire parallel protection configuration is a distance I section and a detected voltage reclosing switch;
the front n-1-level switching station feeder line protection is configured into a distance I section, a distance II section, a current quick break, a low-voltage starting overcurrent, a current increment and a reclosing switch;
the nth stage switching station feeder line protection configuration is distance I section, distance II section, low-voltage starting overcurrent, current increment and reclosing;
the distance I section protection setting calculation is as follows:
the reactance constant value calculation formula is as follows:
Figure FDA0003568595970000011
in the formula: kkFor a reliable coefficient, 0.85 is taken when a substation feeder line and a front n-1-level switching station feeder line are subjected to setting calculation, and 1.5 is taken when a switching station inlet line and an nth-level switching station feeder line are subjected to calculation; l is0For length of supply line, x0Is a unit reactance of the power supply line, L1Is the length of the contact net, x1Is the unit reactance of the contact network, nCTFor current transformer transformation ratio, nPTThe transformation ratio of the voltage transformer is obtained;
the resistance constant value calculation formula is as follows:
Figure FDA0003568595970000012
in the formula: kkIs a reliable coefficient, the value is 1.2, UminIs the lowest operating voltage of the substation or switching station, Ifh.maxIs the maximum load current of the feeder line,
Figure FDA0003568595970000013
in order to be the load impedance angle,
Figure FDA0003568595970000014
is the line impedance angle;
Setting the operation time to 0.1 s;
the distance II section protection setting calculation of the feeder line of the substation is as follows:
the reactance setting value calculation formula is as follows:
Figure FDA0003568595970000015
in the formula: kkThe reliability coefficient is 0.85, KfThe current splitting coefficient is adopted, the single inlet wire operation of the switching station is 1, and the double inlet wire parallel connection is 2; l is2The value of (a) is the length of the contact network of the shortest line in the 1-stage switching station, x2Is a 1-level switching station contact net unit reactance;
the resistance constant value is the same as the resistance constant value of the distance I section;
the action time limit is matched with the time limit of the distance I section of the feeder line of the 1-level switching station, and the action time limit is defined as the time limit of the distance I section of the feeder line of the 1-level switching station plus the time delay delta T;
and (3) the distance II section protection setting calculation of the front n-1 stage switching station:
the reactance constant value calculation formula is as follows:
Figure FDA0003568595970000021
in the formula: kkThe reliability coefficient is 1.5; kfThe current splitting coefficient is adopted, the single incoming line operation of the next stage switching station is 1, and the double incoming lines are connected in parallel to be 2; l is2The value of (A) is the length value of the contact network of the longest line in the next stage switching station; x is the number of2The unit reactance of the contact network of the next stage switching station;
the resistance constant value is the same as the resistance constant value of the distance I section;
the action time limit is matched with the time limit of the distance I section of the feeder line of the next-stage switching station, and the action time limit is set by adding the time limit of the distance I section of the feeder line of the next-stage switching station with the time delay delta T;
The distance II section of the nth stage switching station feeder line is only set for the compound line traction network, and the protection setting calculation is as follows:
the reactance constant value setting formula is as follows:
Figure FDA0003568595970000022
in the formula: kkTaking 1.2 as a reliable coefficient;
the resistance constant value is the same as the resistance constant value of the distance I section;
the action time limit is matched with the time limit of the section I away from the subarea, and the action time limit is set by adding the time limit of the section I away from the subarea with the time delay delta T;
the distance III section protection setting calculation is as follows:
the reactance constant value calculation formula is as follows:
Figure FDA0003568595970000023
in the formula: kkFor reliability factor, take 1.2, L3Length of contact net of longest line in 1-stage switching station, x3Is a unit reactance of a switching station contact network;
the resistance constant value is the same as the resistance constant value of the distance I section;
setting the action time limit to be the time limit of the distance II section plus delta T;
the current quick-break protection setting calculation is as follows:
the action current setting formula is as follows:
Figure FDA0003568595970000031
in the formula: kkTaking 1.2 as a reliable coefficient; i isd.maxThe maximum short-circuit current flowing through the substation or the breaker of the substation feeder line when the fault occurs at the outlet of the substation feeder line;
checking the sensitivity according to the maximum short-circuit current at the feeder circuit breaker of the substation or the stage, see formula
Figure FDA0003568595970000032
In the formula: i isd.b.maxThe maximum short-circuit current of the fault at the feeder circuit breaker of the substation is switched for the substation or the stage;
If the sensitivity is not satisfied, the current is not put into the circuit to be quickly cut off;
setting the operation time to 0.1 s;
the low-voltage starting overcurrent protection setting calculation is as follows:
the action voltage setting formula is as follows:
Figure FDA0003568595970000033
in the formula: u shapeminIs the lowest operating voltage, K, of a substation or a local substationkTaking 1.2 as a reliable coefficient;
the action current setting formula is as follows:
Figure FDA0003568595970000034
in the formula: kkTaking 1.2 as a reliable coefficient; klmFor sensitivity coefficient, take 1.2, Ifh.maxFor maximum load current of the feeder, Id.minThe minimum short-circuit current is the minimum short-circuit current when the tail end of a line fails during single line or the minimum short-circuit current flowing through the protection installation position of the substation during fault of a subarea substation during compound line;
and (3) action time limit: the action time limit is the same between the substation and the distance III section; the action time limit of the front n-1 stage switching station and the distance II section is the same; in the nth stage switching station, the single line time is the same as the action time limit of the first section of the distance, and the multiple line time is the same as the action time limit of the second section of the distance;
the current increment protection setting calculation is as follows:
the action current setting formula is as follows:
Figure FDA0003568595970000041
in the formula: kkTaking 1.0 as a reliable coefficient; i ise.maxRated current of the electric locomotive or the motor train unit with the maximum power running for the line;
and (3) action time limit: the action time limit is the same between the substation and the distance III section; the action time limit of the front n-1 stage switching station and the distance II section is the same; in the nth stage switching station, the single line time is the same as the action time limit of the first section of the distance, and the multiple line time is the same as the action time limit of the second section of the distance;
The reclosing time is set to be 2 s; the resetting time is defined as 20 s;
the voltage fixed value of the voltage-loss automatic switching is set to be 50V, and the voltage fixed value is set to be 3s during operation;
the action voltage of the detected voltage reclosure is set to be 70V; the operation time is set to 3 s.
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