CN203932993U

CN203932993U - The special gate current potential restriction of a kind of city track traffic engineering and current-limiting apparatus

Info

Publication number: CN203932993U
Application number: CN201420346591.3U
Authority: CN
Inventors: 张开波; 霍平
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-25
Filing date: 2014-06-25
Publication date: 2014-11-05
Anticipated expiration: 2024-06-25

Abstract

The special gate current potential restriction of a kind of city track traffic engineering and current-limiting apparatus, with by the step voltage between gate and rail and Current Control in safe range, guarantee that platform car takes advantage of personnel's personal safety and gate equipment operation security.It comprises: the 1st voltage detecting loop, and corresponding access gate and rail form between gate and rail; The 2nd voltage detecting loop, corresponding access rail and station earth bus; Bypass branch, is made up of the by-pass switch that is arranged at feeder line side; Bidirectional current restriction branch road, by series with current-limiting resistance R0 after the 1st silicon chain and the 2nd silicon chain reverse parallel connection; Short circuit branch road, is made up of shorting switch; Rail and the gate at corresponding access station after bypass branch, bidirectional current restriction branch road and short circuit branch circuit parallel connection.

Description

The special gate current potential restriction of a kind of city track traffic engineering and current-limiting apparatus

Technical field

The utility model relates to City Rail Transit System, and the particularly special gate current potential restriction of a kind of city track traffic engineering and current-limiting apparatus, to ensure passenger safety and station platform door safety.

Background technology

The traveling rail of city track traffic engineering is during as DC traction current return circuit, according to " urban railway system platform shielding door systems technology specification " (CJJ183-2012), " 7.6.1 rail is during as return current rail; shield door should be connected with rail equipotential; when equipotential connects: (1) under normal circumstances the palp shield door hardware of human body should insulate with civil engineering structure, and the insulation resistance between Men Tiyu station structure is not less than 0.5M Ω." its objective is that preventing step voltage between shield door (current specifications is referred to as gate) and rail exceeds standard; and avoid more DC traction electric current to enter station civil engineering structure by gate; to become stray electrical current and corrosion structure reinforcing bar, to ensure that car takes advantage of the safety of personnel and station building structure.

In actual project implementing process, due to field condition complexity, the duration is pressed for time, cross-operation between multiple operation, and insulation (being not less than 0.5M Ω) installation difficulty is very large completely to realize gate and platform structure and peripheral facility realization; Or the insulation of operation initial stage meets, but occur that insulation declines after operation a period of time, even insulation destroyed situation completely.

In conventional project scheme, be connected owing to adopting cable form to realize equipotential completely between rail and gate, and rail is the return flow line as traction current, when insulation between gate and station structure declines or insulate complete when destroyed, even if the voltage between gate and rail is not high, still having a large amount of locomotive tractions refluxes by the stube cable between rail and gate, enter the hardware of gate, enter again the structure reinforcing bars (or greatly) at station, cause gate hardware inner or between, or between itself and station structure ground, there is the phenomenon of sparking or arcing, damage the related device in gate, cable or other facilities.For example, in to the gate of certain engineering in the actual test of current flowing, find to have an appointment when maximum the direct current of 500A by gate inflow place, generally according to the variation of insulation resistance between the difference of traction current and gate and ground, also there is the peak current of 90～300A left and right to enter gate, roughly account for the more than 10% of traction current.

So a large direct current enters the structure reinforcing bars at station by gate, not only gate equipment itself is caused to comparatively serious damage, takes advantage of personnel's safety to bring serious potential safety hazard to operation and car; This part traction current electric current enters after station structure reinforcing bar simultaneously, becomes stray electrical current, also can cause totally unfavorable corrosion consequence to the structure reinforcing bars of station and station neighboring buildings.

For avoiding this large amount of traction current to enter the situation of gate by rail, urban railway traffic engineering is in actual operation process, directly the bonding wire between rail and gate is cancelled, not only conflict mutually with existing specification, simultaneously owing to the current potential between rail and gate not being carried out to Real-Time Monitoring and restriction, at some in particular cases, exceed standard if there is the step voltage between gate and rail, the personal safety by take advantage of personnel to get on or off the bus by gate to car time is brought certain potential safety hazard.

Therefore, in the face of the gate insulation at the each station of city track traffic engineering is difficult to accomplish or be difficult to the reality that maintenance is insulated reliably and with long-term completely, be badly in need of a kind of device, by the step voltage between restriction gate and rail, ensure that car takes advantage of personnel's personal safety; By the electric current between restriction gate and rail, prevent that the structure reinforcing bars that too much traction current enters station by gate from becoming stray electrical current simultaneously, avoid damaging gate equipment, ensure the safety of operation facility.

For the engineering present situation of domestic city track traffic,, constructability reliable from operation security installed and the angle of operation maintenance, propose to arrange AT STATION a kind of gate current potential restriction and current limiting device, realize improvement and the optimization of connection scheme between gate and rail.

Utility model content

Technical problem to be solved in the utility model is to provide the special gate current potential restriction of a kind of city track traffic engineering and current-limiting apparatus, with by the step voltage between gate and rail and Current Control in safe range, guarantee that platform car takes advantage of personnel's personal safety and gate equipment operation security.

It is as follows that the utility model solves the technical scheme that its technical problem adopts:

The special gate current potential restriction of a kind of city track traffic engineering of the present utility model and current-limiting apparatus, is characterized in that it comprises: the 1st voltage detecting loop, and corresponding access gate and rail form between gate and rail; The 2nd voltage detecting loop, corresponding access rail and station earth bus; Bypass branch, is made up of the by-pass switch that is arranged at feeder line side; Bidirectional current restriction branch road, by series with current-limiting resistance R0 after the 1st silicon chain and the 2nd silicon chain reverse parallel connection; Short circuit branch road, is made up of shorting switch; Rail and the gate at corresponding access station after bypass branch, bidirectional current restriction branch road and short circuit branch circuit parallel connection.

The beneficial effects of the utility model are, connection scheme new between a kind of gate and rail is provided, in normally operation situation, has realized reliable connection the under safe voltage between gate and rail, but limit the electric current between gate and rail, protected the operation security of gate equipment; In special serious situation, limit the higher step voltage that may occur between gate and rail, ensured that platform car takes advantage of personnel's personal safety; Can be according to the voltage between step voltage, rail and ground between the on-the-spot gate in station and rail, simultaneously can be in conjunction with rolling stock particular location AT STATION, the output of dynamic adjusting device, by the step voltage between gate and rail and Current Control in safe range, rail is measured by the electric current of gate simultaneously, dynamic monitoring, for owner's operation maintenance provides a quantitative foundation; Can be arranged on be convenient to that station operation and maintenance personnel makes an inspection tour or the room or wall of operation on, by signal and interface display intuitively, implement device monitoring function; Improve security reliability, the constructability of city track traffic engineering in long-term operation process and installed, be also convenient to operation maintenance.

Brief description of the drawings

This specification comprises following 1 width accompanying drawing:

Fig. 1 is the circuit theory schematic diagram of the special gate current potential restriction of a kind of city track traffic engineering of the utility model and current-limiting apparatus.

In figure, indicate parts, toponym and corresponding mark: the 1st sampling resistor R1, the 2nd sampling resistor R2, the 3rd sampling resistor R3, the 4th sampling resistor R4, current-limiting resistance R0, by-pass switch 1QS, the 1st current sensor TA1, the 2nd current sensor TA2, the 1st silicon chain D1, the 2nd silicon chain D2, shorting switch KM1.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further illustrated.

With reference to Fig. 1, the special gate current potential restriction of a kind of city track traffic engineering of the utility model and current-limiting apparatus, is characterized in that it comprises: the 1st voltage detecting loop, and corresponding access gate and rail form between gate and rail; The 2nd voltage detecting loop, corresponding access rail and station earth bus; Bypass branch, is made up of the by-pass switch 1QS that is arranged at feeder line side; Bidirectional current restriction branch road, by series with current-limiting resistance R0 after the 1st silicon chain D1 and the 2nd silicon chain D2 reverse parallel connection; Short circuit branch road, by shorting switch, KM1 forms; Rail and the gate at corresponding access station after bypass branch, bidirectional current restriction branch road and short circuit branch circuit parallel connection.

With reference to Fig. 1, described the 1st voltage detecting loop is in series by the 1st sampling resistor R1, the 2nd sampling resistor R2, for detection of the voltage between gate and rail.Described the 2nd voltage detecting loop is in series by the 3rd sampling resistor R3, the 4th sampling resistor R4, for detection of the voltage between rail and ground.

With reference to Fig. 1, the 1st current sensor TA1 is for detection of electric current in described bidirectional current restriction branch road access, and the 2nd current sensor TA2 is for detection of electric current in described short circuit branch road access.

The operation principle of the special gate current potential restriction of a kind of city track traffic engineering of the utility model and current-limiting apparatus is as follows:

1, under normal circumstances, between gate and rail, pass through after the 1st silicon chain D1 and the 2nd silicon chain D2 reverse parallel connection of device inside, with current-limiting resistance R0 UNICOM, in the situation that voltage is lower, the 1st silicon chain D1 and the 2nd not conducting of silicon chain D2, Limited Current flows into gate from rail, or electric current flows into rail from gate.

2, in some situation, between gate and rail, there is voltage rising (harmless), to certain value, the 1st silicon chain D1 and the 2nd silicon chain D2 conducting that device is inner, by the limiting voltage between gate and rail within the scope of certain safe voltage, by current-limiting resistance R0, will flow into gate from rail, or the current limit that electric current flows into rail from gate is in a very little scope simultaneously.

3, in special circumstances, if the power supply between gate and rail continues to rise, occur the adventurous step voltage of personal safety or touch voltage, install inner shorting switch KM1 automatically closed, be connected realizing complete equipotential between gate and rail, ensure that car takes advantage of personnel's personal safety, after closed certain hour, electric current between rail and gate drops to certain value, and the in the situation that of guarantee personnel and device security, device disconnects shorting switch KM1 automatically.

4, after breaking down in device inside, by the by-pass switch 1QS of direct closed bypass branch, be connected realizing equipotential between gate and rail, after trouble shooting, then disconnect this by-pass switch 1QS.

Some principles of the special gate current potential restriction of the above a kind of city track traffic engineering of the utility model that just explains through diagrams and current-limiting apparatus, be not the utility model to be confined to shown in and in described concrete structure and the scope of application, the corresponding modify and the equivalent that likely utilize this device general principle therefore every, all belong to the scope of the claims that the utility model is applied for.

Claims

1. the special gate current potential restriction of city track traffic engineering and a current-limiting apparatus, is characterized in that it comprises: the 1st voltage detecting loop, and corresponding access gate and rail form between gate and rail; The 2nd voltage detecting loop, corresponding access rail and station earth bus; Bypass branch, is made up of the by-pass switch (1QS) that is arranged at feeder line side; Bidirectional current restriction branch road, by series with current-limiting resistance R0 after the 1st silicon chain (D1) and the 2nd silicon chain (D2) reverse parallel connection; Short circuit branch road, is made up of shorting switch (KM1); Rail and the gate at corresponding access station after bypass branch, bidirectional current restriction branch road and short circuit branch circuit parallel connection.

2. the special gate current potential restriction of a kind of city track traffic engineering as claimed in claim 1 and current-limiting apparatus, is characterized in that: described the 1st voltage detecting loop is in series by the 1st sampling resistor (R1), the 2nd sampling resistor (R2).

3. the special gate current potential restriction of a kind of city track traffic engineering as claimed in claim 1 and current-limiting apparatus, is characterized in that: described the 2nd voltage detecting loop is in series by the 3rd sampling resistor (R3), the 4th sampling resistor (R4).

4. the special gate current potential restriction of a kind of city track traffic engineering as claimed in claim 1 and current-limiting apparatus, it is characterized in that: described bidirectional current restriction branch road access the 1st current sensor (TA1), described short circuit branch road access the 2nd current sensor (TA2).