CN210792877U - Contact net short circuit protection system of through type cophase power supply system - Google Patents
Contact net short circuit protection system of through type cophase power supply system Download PDFInfo
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- CN210792877U CN210792877U CN201921612241.6U CN201921612241U CN210792877U CN 210792877 U CN210792877 U CN 210792877U CN 201921612241 U CN201921612241 U CN 201921612241U CN 210792877 U CN210792877 U CN 210792877U
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Abstract
The utility model relates to a contact net short circuit protection system of a through-type cophase power supply system.A plurality of parallel circuit breakers are arranged at the outlets of two adjacent traction substations, and each circuit breaker is provided with a current transformer; a voltage transformer and a current transformer are arranged on the feeder line side for supplying power to the positive line and are connected in series; and a path of optical fiber communication channel is arranged between adjacent traction substations. The utility model discloses a gather current transformer and the voltage transformer signal of each feeder of adjacent traction substation, convey relevant electrical parameter to through cophase power supply system and carry out the analysis synthesis and judge, send the tripping operation order to corresponding feeder circuit breaker, have the optical fiber longitudinal differential protection and the high resistance ground protection function of pilot distance protection, pilot current protection, low-voltage start-up, reached the purpose of protection through cophase power supply system contact net. The utility model provides a traditional conventional relay protection can't protect the problem of contact net overall length when through homophase power supply system contact net takes place heavy current ground connection and high resistance ground connection.
Description
Technical Field
The utility model belongs to the technical field of the railway electrical, concretely relates to through cophase power supply system's contact net short-circuit protection system.
Background
After the electrified railway adopts through type cophase power supply, a network structure is changed compared with a traditional unilateral power supply mode, when a contact network is short-circuited, the current directions of feeder lines of a traction substation are possibly different, and the traditional conventional relay protection cannot meet the requirement of protecting the whole length of the contact network.
Disclosure of Invention
The utility model aims at providing a through cophase power supply system's contact net short-circuit protection system has solved the problem of the unable protection contact net total length of traditional conventional relay protection when through cophase power supply network system contact net takes place heavy current ground connection and high resistance ground connection.
The utility model discloses the technical scheme who adopts does:
the utility model provides a through cophase power supply system's contact net short-circuit protection system which characterized in that:
a plurality of circuit breakers connected in parallel are arranged on feeder lines of adjacent traction substations, and each circuit breaker is provided with a current transformer;
a voltage transformer and a current transformer are arranged on the feeder line side for supplying power to the positive line and are connected in series;
and an optical fiber communication channel is arranged between the adjacent traction substations.
When a single-track railway is adopted, three parallel circuit breakers are arranged on a feeder line of a traction substation to supply power for a positive line and a neutral section of a contact network, wherein the three parallel circuit breakers are respectively DL11, DL12 and DL13, and each circuit breaker is provided with a current transformer which is respectively LH11, LH12 and LH 13; two voltage transformers YH11 and YH13 are arranged on the feeder line side for supplying power to the positive line and are respectively connected with LH11 and LH13 in series;
the feeder line of the other traction substation is provided with three parallel electric breakers for supplying power to a positive line and a neutral section of a contact network, wherein the three parallel electric breakers are DL21, DL22 and DL23 respectively, and each breaker is provided with a current transformer which is LH21, LH22 and LH23 respectively; two voltage transformers YH21 and YH23 are arranged on the feeder line side for supplying power to the positive line and are respectively connected with LH21 and LH23 in series.
When a compound line railway is adopted, five circuit breakers connected in parallel are arranged on a feeder line of a traction substation, wherein the five circuit breakers comprise DL11 and DL14 for supplying power to an uplink line, DL12 and DL13 for supplying power to a downlink line and DL15 for supplying power to a neutral section of a contact network; each breaker is provided with a current transformer which is respectively LH11, LH12, LH13, LH14 and LH 15; two voltage transformers YH11 and YH14 are arranged on the feeder line side for supplying power to the uplink line and are respectively connected with LH11 and LH14 in series; two voltage transformers YH12 and YH13 are arranged on the feeder line side for supplying power to the downlink, and are respectively connected with LH12 and LH13 in series;
the other traction substation feeder is provided with five circuit breakers connected in parallel, wherein each circuit breaker comprises DL21 and DL24 for supplying power to an uplink, DL22 and DL23 for supplying power to a downlink and DL25 for supplying power to a neutral section of a contact network; each breaker is provided with a current transformer which is respectively LH21, LH22, LH23, LH24 and LH 25; two voltage transformers YH21 and YH24 are arranged on the feeder line side for supplying power to the uplink line and are respectively connected with LH21 and LH24 in series; two voltage transformers YH22 and YH23 are arranged on the feeder line side for supplying power to the downlink, and are respectively connected with LH22 and LH23 in series.
The utility model has the advantages of it is following:
1. the utility model is suitable for a through power supply railway of a direct power supply mode with a return line and an AT power supply mode of a compound line and a single line;
2. the protection rapid linkage of the adjacent traction substations can be realized only by mutually transmitting the protection action information between the adjacent traction substations, and the short-circuit fault of the contact network can be rapidly and accurately eliminated;
3. the utility model can provide reliable short-circuit fault protection for the through cophase power supply system;
4. the utility model discloses can promote the judgement that link up homophase power supply system contact net high resistance ground connection;
5. the starting value of the current increment of the high-resistance grounding can adopt a smaller value, and the sensitivity of the protection is improved.
Drawings
Fig. 1 is a diagram of a short-circuit protection system for a feed-through in-phase power supply network system in the single-line case.
Fig. 2 is a diagram of a short-circuit protection system of a through-type in-phase power supply network system in the case of a complex line.
The conventional protective legends are as follows:
The measurement and control protection diagram of the through-type in-phase power supply network system is as follows:
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The utility model relates to a through cophase power supply system's contact net short-circuit protection system, its constitution constitutes for each draws attached primary equipment such as partial current transformer, voltage transformer of increase of electric substation feeder circuit breaker on conventional equipment configuration basis, specifically includes: arranging a plurality of circuit breakers connected in parallel at the outlets of two adjacent traction substations, wherein each circuit breaker is provided with a current transformer; a voltage transformer and a current transformer are arranged on the feeder line side for supplying power to the positive line and are connected in series; and a path of optical fiber communication channel is arranged between adjacent traction substations.
Referring to fig. 1, a feeder line of a traction substation is provided with three parallel circuit breakers for supplying power to a positive line and a neutral section of a contact network, wherein the three parallel circuit breakers are respectively DL11, DL12 and DL13, and each circuit breaker is provided with a current transformer which is respectively LH11, LH12 and LH 13; two voltage transformers YH11 and YH13 are arranged on the feeder line side for supplying power to the positive line and are respectively connected with LH11 and LH13 in series; the feeder line of the other traction substation is provided with three parallel electric breakers for supplying power to a positive line and a neutral section of a contact network, wherein the three parallel electric breakers are DL21, DL22 and DL23 respectively, and each breaker is provided with a current transformer which is LH21, LH22 and LH23 respectively; two voltage transformers YH21 and YH23 are arranged on the feeder line side for supplying power to the positive line and are respectively connected with LH21 and LH23 in series. And arranging a path of optical fiber communication channel between adjacent traction substations.
Referring to fig. 2, five parallel breakers are arranged on a feeder line of a traction substation, and include DL11 and DL14 for supplying power to an uplink, DL12 and DL13 for supplying power to a downlink, and DL15 for supplying power to a neutral section of a contact network; each breaker is provided with a current transformer which is respectively LH11, LH12, LH13, LH14 and LH 15; two voltage transformers YH11 and YH14 are arranged on the feeder line side for supplying power to the uplink line and are respectively connected with LH11 and LH14 in series; two voltage transformers YH12 and YH13 are arranged on the feeder line side for supplying power to the downlink, and are respectively connected with LH12 and LH13 in series; the other traction substation feeder is provided with five circuit breakers connected in parallel, wherein each circuit breaker comprises DL21 and DL24 for supplying power to an uplink, DL22 and DL23 for supplying power to a downlink and DL25 for supplying power to a neutral section of a contact network; each breaker is provided with a current transformer which is respectively LH21, LH22, LH23, LH24 and LH 25; two voltage transformers YH21 and YH24 are arranged on the feeder line side for supplying power to the uplink line and are respectively connected with LH21 and LH24 in series; two voltage transformers YH22 and YH23 are arranged on the feeder line side for supplying power to the downlink, and are respectively connected with LH22 and LH23 in series. And arranging a path of optical fiber communication channel between adjacent traction substations.
The short-circuit protection method of the through-type in-phase power supply system based on the system specifically comprises the following steps: in the through-type in-phase power supply network system, each traction substation feeder circuit breaker is provided with conventional protection, and also provided with directional longitudinal distance protection, longitudinal current protection and low-voltage started optical fiber longitudinal differential protection. The longitudinal distance protection adopts three-section distance protection, the section I protection is forward distance protection, the protection range is 90% of the length of the power supply arm, the section II protection is reverse distance protection, and the protection range is 90% of the length of the power supply arm in the other direction of the traction substation; the protection of the section III is forward distance protection, the protection range is the full length of the power supply arm, and the protection eliminates the protection dead zone of the section I distance protection. The forward direction refers to a direction in which a bus of the traction substation points to a contact net, and the reverse direction refers to a direction in which a feeder of the traction substation points to a bus in the substation. The length of the power supply arm refers to the length from the traction substation to a contact network of the adjacent traction substation. The optical fiber communication channel arranged between the adjacent feeder circuit breakers of two adjacent traction substations and the I-section protection tripping information station is used for mutual transmission, when any circuit breaker is in protection action, a linkage tripping command is sent to the adjacent feeder circuit breaker of the adjacent traction substation in the positive direction, and the adjacent feeder circuit breaker of the adjacent traction substation is linked and tripped without delay; the optical fiber longitudinal differential protection started at low voltage is characterized in that bus voltage measured by a 27.5kV bus voltage transformer of a traction substation is lower than a specified value (such as 16.6kV, a main circuit of a locomotive is closed at the moment), a differential current fixed value is kept out of setting of load current in a protection area, and after an outlet is protected, an optical fiber communication channel arranged between adjacent feeder circuit breakers of adjacent traction substations are tripped simultaneously; the pilot current protection collects current information of adjacent feeders of adjacent traction substations through an optical fiber communication channel arranged between the two feeders, carries out setting according to the condition that the sum of the currents of the two feeders is larger than the maximum load current in the interval, and simultaneously trips off the circuit breakers of the two feeders after an outlet is protected, so that the aim of isolating a fault area is fulfilled.
In the through type in-phase power supply network system, each traction substation feeder circuit breaker is also provided with high-resistance grounding protection, an optical fiber communication channel arranged between two adjacent traction substations of the power supply system is penetrated, whether high-resistance grounding occurs or not is judged by measuring and comparing current information of adjacent feeders, a tripping signal is sent out, and meanwhile, the adjacent feeder circuit breakers of the adjacent substations are tripped in a linked mode. The high-resistance grounding protection adopts two-section protection, the I-section protection adopts conventional current increment protection, the protection time limit is short, but the sensitivity to a large transition resistor is low, and the protection time limit of the II-section protection is long, but the sensitivity to the large transition resistor is high.
The protection method for the through-type in-phase power supply network system contact network during heavy current grounding comprises the following steps:
when a large-current short-circuit fault occurs in a contact network, the impedance of a traction network loop is reduced, the longitudinal distance protection rate of a traction substation feeder line close to a short-circuit point is judged to be the short-circuit fault first, a corresponding feeder line breaker is tripped, meanwhile, a link tripping command is sent to an adjacent feeder line breaker of an adjacent traction substation in the positive direction by using an optical fiber communication channel, and the adjacent feeder line breaker of the adjacent traction substation is tripped without delay, so that the aim of isolating a fault area is fulfilled.
When the short-circuit fault of the contact network is not detected by the distance protection, the optical fiber longitudinal differential protection started by low voltage is higher than a specified value by measuring that the 27.5kV bus voltage of the traction substation is lower than a specified value, and the differential current specified value is higher than no-load current, so that the adjacent feeder circuit breakers of the adjacent traction substations are tripped simultaneously.
When the short-circuit fault of the contact network is not detected by the distance protection and the low-voltage started optical fiber longitudinal differential protection, the longitudinal current protection collects the current information of the adjacent feeder lines of the adjacent traction substation, and if the sum of the currents of the two feeder lines is larger than the maximum load current setting value of the interval, the circuit breakers of the two feeder lines are tripped simultaneously, so that the purpose of isolating the fault area is achieved.
The protection method for the overhead line system of the through-type in-phase power supply network system when high-resistance grounding occurs comprises the following steps:
when a high-resistance grounding fault occurs to the contact network, the two adjacent traction substations in the through power supply mode judge the following information by measuring and comparing the current information of the adjacent feeder lines:
I1t/I2t≈I1(t+△t)/I2(t+△t)——(1)；
I1≥Izdor I2≥Izd——(2)
△I1≥△IzdOr △ I2≥△Izd——(3)
t≥tzd——(4)
△t＝tzd——(5)
In the formula I1t、I2tFor the current value of the adjacent feeder of the adjacent traction substation, IzdTo set value, △ I1、△I2For current increment, △ IzdFor the current increment protection setting value, t is the time from the protection start to the exit, tzdFor the protection time limit setting value, the formula (3) is the protection starting condition.
When the formulas are simultaneously satisfied, the situation that the high-resistance grounding of the contact network occurs is judged, a tripping signal is sent out, and the adjacent feeder circuit breakers adjacent to each other are tripped in a linked mode, so that the purpose of isolating a fault area is achieved.
The content of the present invention is not limited to the examples, and any equivalent transformation adopted by the technical solution of the present invention is covered by the claims of the present invention by those skilled in the art through reading the present invention.
Claims (3)
1. The utility model provides a through cophase power supply system's contact net short-circuit protection system which characterized in that:
a plurality of circuit breakers connected in parallel are arranged on feeder lines of adjacent traction substations, and each circuit breaker is provided with a current transformer;
a voltage transformer and a current transformer are arranged on the feeder line side for supplying power to the positive line and are connected in series;
and an optical fiber communication channel is arranged between the adjacent traction substations.
2. The contact network short-circuit protection system of the through-type cophase power supply system according to claim 1, characterized in that:
when a single-track railway is adopted, three parallel circuit breakers are arranged on a feeder line of a traction substation to supply power for a positive line and a neutral section of a contact network, wherein the three parallel circuit breakers are respectively DL11, DL12 and DL13, and each circuit breaker is provided with a current transformer which is respectively LH11, LH12 and LH 13; two voltage transformers YH11 and YH13 are arranged on the feeder line side for supplying power to the positive line and are respectively connected with LH11 and LH13 in series;
the feeder line of the other traction substation is provided with three parallel electric breakers for supplying power to a positive line and a neutral section of a contact network, wherein the three parallel electric breakers are DL21, DL22 and DL23 respectively, and each breaker is provided with a current transformer which is LH21, LH22 and LH23 respectively; two voltage transformers YH21 and YH23 are arranged on the feeder line side for supplying power to the positive line and are respectively connected with LH21 and LH23 in series.
3. The contact network short-circuit protection system of the through-type cophase power supply system according to claim 1, characterized in that:
when a compound line railway is adopted, five circuit breakers connected in parallel are arranged on a feeder line of a traction substation, wherein the five circuit breakers comprise DL11 and DL14 for supplying power to an uplink line, DL12 and DL13 for supplying power to a downlink line and DL15 for supplying power to a neutral section of a contact network; each breaker is provided with a current transformer which is respectively LH11, LH12, LH13, LH14 and LH 15; two voltage transformers YH11 and YH14 are arranged on the feeder line side for supplying power to the uplink line and are respectively connected with LH11 and LH14 in series; two voltage transformers YH12 and YH13 are arranged on the feeder line side for supplying power to the downlink, and are respectively connected with LH12 and LH13 in series;
the other traction substation feeder is provided with five circuit breakers connected in parallel, wherein each circuit breaker comprises DL21 and DL24 for supplying power to an uplink, DL22 and DL23 for supplying power to a downlink and DL25 for supplying power to a neutral section of a contact network; each breaker is provided with a current transformer which is respectively LH21, LH22, LH23, LH24 and LH 25; two voltage transformers YH21 and YH24 are arranged on the feeder line side for supplying power to the uplink line and are respectively connected with LH21 and LH24 in series; two voltage transformers YH22 and YH23 are arranged on the feeder line side for supplying power to the downlink, and are respectively connected with LH22 and LH23 in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921612241.6U CN210792877U (en) | 2019-09-25 | 2019-09-25 | Contact net short circuit protection system of through type cophase power supply system |
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| CN201921612241.6U CN210792877U (en) | 2019-09-25 | 2019-09-25 | Contact net short circuit protection system of through type cophase power supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110606000A (en) * | 2019-09-25 | 2019-12-24 | 中铁第一勘察设计院集团有限公司 | Contact network short-circuit protection system and method of through type in-phase power supply system |
| CN113022389A (en) * | 2020-09-21 | 2021-06-25 | 西南交通大学 | Relay protection method for traction network power supply arm based on directional impedance element |
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2019
- 2019-09-25 CN CN201921612241.6U patent/CN210792877U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110606000A (en) * | 2019-09-25 | 2019-12-24 | 中铁第一勘察设计院集团有限公司 | Contact network short-circuit protection system and method of through type in-phase power supply system |
| CN110606000B (en) * | 2019-09-25 | 2023-08-04 | 中铁第一勘察设计院集团有限公司 | Contact net short-circuit protection system and method of through type in-phase power supply system |
| CN113022389A (en) * | 2020-09-21 | 2021-06-25 | 西南交通大学 | Relay protection method for traction network power supply arm based on directional impedance element |
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