CN205395812U

CN205395812U - Electric Railway link up unloaded monitoring device of system of power supply

Info

Publication number: CN205395812U
Application number: CN201620177886.1U
Authority: CN
Inventors: 李群湛; 郭锴; 解绍峰; 赵艺
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2016-03-09
Filing date: 2016-03-09
Publication date: 2016-07-27
Anticipated expiration: 2026-03-09

Abstract

The utility model provides an electric Railway link up unloaded monitoring device of system of power supply relates to a. C. Electrification railway power supply technical field. Link up the power supply system alternative seat TS0 monitoring device of the electric substation ware that is chosen at electric Railway, the TS0's of electric substation feeder current transformer's measuring junction is connected to the input of watch -dog, and the output of watch -dog is connected to the control end of other electric substation's feeder circuit breakers through optical network, when feeder electric current less than or equal to designated value that the TS0's of electric substation watch -dog detected through feeder current transformer measuring junction, make this feeder circuit breaker tripped to the control end of other electric substation's feeder circuit breakers through the optical network output command, otherwise other electric substation's feeder circuit breakers still keep the operating position, from this can this system of accurate judgement whether be in the circuit breaker in light condition and the tripping equalizing current looped in when the empty load the minimal cut set, effectively eliminate electric Railway have a perfect understanding the power supply system light condition under with the equalizing current of electric net shape one -tenth.

Description

A kind of system zero load supervising device of the through power supply of electric railway

Technical field

This utility model relates to attached wires of AC electrified railway power supply technique field, particularly relates to the power supply technique of the through electric power system of electric railway.

Background technology

The commonly used single phase industrial frequency AC system powered by municipal power supply system of electric railway, for making single-phase traction load equilibrium assignmen as far as possible in three-phase electrical power system, electric railway often adopts the scheme of rotation phase sequence, point phase switched-mode power supply.Divide and isolate with neutral section insulator between the adjacent service area at phase subregion place, form electricity point phase, an abbreviation point phase.The traditional approach of the logical phase splitting of electric locomotive is manual undue phase, relies primarily on driver and is performed manually by and moves back level, close auxiliary unit, disconnected main circuit breaker, cross neutral section, again co-host break road device by train inertia, close auxiliary unit and then recover traction power to complete undue phase.This artificial commutation mode easily causes the charged logical phase splitting of electric locomotive (undue phase) and occurs arcing to burn out overhead contact line parts, even results in the accidents such as phase fault.Continuous rising along with train speed, have employed automatic passing over of neutral section technology, mainly there is automatically switch on undue phase, vehicle-mounted automatic passing over of neutral section and post automatic passing over of neutral section etc. of floor switches several, but still suffer from the electric process of transient state of the logical phase splitting of train in switch switching, it is easily generated bigger switching overvoltage or overcurrent, cause the accidents such as Traction networks and mobile unit scaling loss, even result in automatic passing over of neutral section operation failure, affect power supply reliability and safe train operation.Therefore, electricity point phase link is link the weakest in whole tractive power supply system, the bottleneck that train becomes high-speed railway too mutually or even whole electric railway traction is powered.

Theory and practice shows to adopt single-phase traction transformer or combination type cophase supply technology can cancel the electricity point phase in its exit at traction substation, can cancel the electricity point phase at this place in the adopted two-side feeding technology of subregion.On lines join ground, traction substation adopts cophase supply technology and the adopted two-side feeding technology of subregion to be the formation of cancelling completely the tractive power supply system of electricity point phase, is called through electric power system, thus eliminating power supply bottleneck, improves power supply capacity and transport capacity.It will be appreciated, however, that through power supply is implemented in electric railway more or less will cause undesirable euqalizing current (penetration) between electrical network and tractive power supply system.Euqalizing current (penetration) shows when tractive power supply system zero load substantially, and euqalizing current " will be flooded " by load institute when load is more than no-load current.This utility model can effectively eliminate euqalizing current during through electric power system zero load.

Utility model content

The purpose of this utility model is just to provide the system zero load supervising device of the through power supply of a kind of electric railway, and it can eliminate euqalizing current during zero load effectively.

This utility model solves its technical problem, the technical scheme adopted is: the system zero load supervising device of the through power supply of a kind of electric railway, the former limit of main converter MT of each traction substation connects three phase network ABC, secondary limit is connected to Traction networks OCS through traction bus TB, tractive feeder F and feeder breaker K and feeder current transformer CT thereof, and the Traction networks OCS between each traction substation is connected to implement electric railway with connecting power supply；A traction substation is selected to be designated as electric substation TS₀, all the other traction substations are designated as electric substation TS_i, i=1 ..., n-1, n >=2；Unloaded supervising device includes electric substation TS₀Watch-dog SU, electric substation TS₀Feeder current transformer CT₀, fiber optic network FO and each electric substation TS_iFeeder breaker K_i；The input of watch-dog SU connects electric substation TS₀Feeder current transformer CT₀Measurement end MU, the outfan of watch-dog SU is connected to each electric substation TS through fiber optic network FO_iFeeder breaker K_iControl end CU_i。

The system zero load supervising device of the through power supply of a kind of electric railway, realizes monitoring, by the following method as electric substation TS₀Watch-dog SU by feeder current transformer CT₀When measuring the end MU tractive feeder electric current detected less than or equal to designated value, watch-dog SU is through fiber optic network FO output order to each electric substation TS_iFeeder breaker K_iControl end CU_iMake feeder breaker K_iTripping operation, otherwise each electric substation TS_iFeeder breaker K_iMaintenance "on" position, i=1 ..., n-1, n >=2.This through electric power system is used for the through electric power system of electric railway being made up of Traction networks OCS and n seat traction substation.

Designated value refers to that the through electric power system of electric railway is subject to unloaded trend value when flowing or no-load current value without train, is mainly charging trend or the charging current of this through electric power system, and its numerical value is much smaller than train load.

As electric substation TS_iDuring more than 2, should as far as possible by electric substation TS₀It is positioned close to the position in the middle of system.

Obviously, feeder breaker can be conventional mechanical switch, it is also possible to be electronic power switch.

Operation principle of the present utility model is: utilize fiber optic network transmission capacity advantage big, fireballing and data synchronization technology to obtain the synchrodata of strange land traction substation, the trend distribution character of the passive network according to electrical network and electric railway through electric power system composition and the unloaded boundary (all there were significant differences for the numerical values recited of the two and power-factor angle) with load of the through electric power system of electric railway, with the unloaded trend value of the through electric power system of electric railway or no-load current value for designated value, a traction substation is selected (to be designated as electric substation TS₀) for reference, it is judged that whether this system is in Light Condition, and tripping euqalizing current forms the chopper in the minimal cut set in loop when zero load, thus eliminating euqalizing current.

Compared with prior art, the beneficial effects of the utility model are:

One, of the present utility model can accurately judge whether this system is in Light Condition, and tripping euqalizing current forms the chopper in the minimal cut set in loop when zero load.

Two, of the present utility model can effectively eliminate under the through electric power system Light Condition of electric railway with electrical network formed euqalizing current.

Three, this utility model simple in construction, superior performance, advanced technology, method are reliable, it is easy to implement.

Accompanying drawing explanation

Fig. 1 is the through electric power system zero load supervising device structural representation of this utility model embodiment.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the utility model will be further described.

Embodiment: Fig. 1 illustrates the through electric power system structural representation of this utility model embodiment.The system zero load supervising device of the through power supply of a kind of electric railway, for the through electric power system of electric railway being made up of Traction networks OCS and n seat traction substation；The former limit of main converter MT of traction substation connects three phase network ABC, secondary limit is connected to Traction networks OCS through traction bus TB, tractive feeder F and feeder breaker K and feeder current transformer CT thereof, and the Traction networks OCS between each traction substation is connected to implement electric railway with connecting power supply；The main converter MT of traction substation is generally tractive transformer or the assembly of tractive transformer and compensation device；In figure, L1, L2, L3 are train；A traction substation is selected to be designated as electric substation TS₀, all the other traction substations are designated as electric substation TS_i, i=1 ..., n-1, n >=2；Described unloaded supervising device is by electric substation TS₀Watch-dog SU, electric substation TS₀Feeder current transformer CT₀, fiber optic network FO and each electric substation TS_iFeeder breaker K_iComposition；The input of watch-dog SU connects electric substation TS₀Feeder current transformer CT₀Measurement end MU, the outfan of watch-dog SU is connected to each electric substation TS through fiber optic network FO_iFeeder breaker K_iControl end CU_i, as shown in phantom in Figure 1, arrow represents information flow direction.

The system zero load supervising device of the through power supply of a kind of electric railway, realizes monitoring: by the following method as electric substation TS₀Watch-dog SU by feeder current transformer CT₀When the tractive feeder electric current that measurement end detects is less than or equal to designated value, watch-dog SU is through fiber optic network FO output order to each electric substation TS_iFeeder breaker K_iControl end CU_iMake feeder breaker K_iTripping operation, otherwise each electric substation TS_iFeeder breaker K_iMaintenance "on" position, i=1 ..., n-1, n >=2, as shown in phantom in Figure 1.

Designated value refers to that the through electric power system of electric railway is subject to unloaded trend value when flowing or no-load current value without train, is mainly charging trend or the electric current of this through electric power system, and its numerical value is much smaller than train load.

Operation principle of the present utility model is: utilize fiber optic network transmission capacity advantage big, fireballing and data synchronization technology to obtain the synchrodata of strange land traction substation, the trend distribution character of the passive network according to electrical network and electric railway through electric power system composition and the unloaded boundary with load of the through electric power system of electric railway, select a traction substation (to be designated as electric substation TS₀) for reference, it is judged that whether this system is in Light Condition, and tripping euqalizing current forms the chopper in the minimal cut set in loop when zero load.

Claims

1. the system zero load supervising device of the through power supply of electric railway, the former limit of main converter MT of each traction substation connects three phase network ABC, secondary limit is connected to Traction networks OCS through traction bus TB, tractive feeder F and feeder breaker K and feeder current transformer CT thereof, and the Traction networks OCS between each traction substation is connected to implement electric railway with connecting power supply；It is characterized in that: select a traction substation to be designated as electric substation TS₀, all the other traction substations are designated as electric substation TS_i, i=1 ..., n-1, n >=2；Unloaded supervising device includes electric substation TS₀Watch-dog SU, electric substation TS₀Feeder current transformer CT₀, fiber optic network FO and each electric substation TS_iFeeder breaker K_i；The input of watch-dog SU connects electric substation TS₀Feeder current transformer CT₀Measurement end MU, the outfan of watch-dog SU is connected to each electric substation TS through fiber optic network FO_iFeeder breaker K_iControl end CU_i。

2. the system zero load supervising device of the through power supply of a kind of electric railway according to claim 1, it is characterised in that: described feeder breaker can be conventional mechanical switch, it is also possible to be electronic power switch.