CN210111605U - DC traction power supply system for eliminating residual voltage - Google Patents
DC traction power supply system for eliminating residual voltage Download PDFInfo
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Abstract
The utility model discloses an eliminate direct current of residual voltage and pull power supply system belongs to track power supply technical field. The utility model discloses set up between power supply bus and walking track, include: the voltage detection circuit detects the voltage between the overhead line system and the traveling rail and sends the voltage to the control protection device; the contact net residual voltage absorption loop is respectively connected with the contact net and the traveling rail and absorbs the contact net residual voltage; the disconnecting switch responds to an instruction of the control protection device and supplies power to the contact network or isolates the contact network from the bus or grounds the contact network; and the control protection device is used for acquiring the voltage between the overhead line system and the walking rail, and controlling the residual voltage absorption loop of the overhead line system to work until the residual voltage absorption loop reaches a normal value when the voltage exceeds a specified threshold value. The utility model can effectively and rapidly absorb the residual pressure of the contact net; the circuit test is effectively carried out, and the breaker is prevented from being switched on a fault circuit; the residual voltage is absorbed quickly before the contact net is grounded, and the isolating switch is guaranteed to be grounded without electricity.
Description
Technical Field
The utility model belongs to the technical field of the track power supply, concretely relates to eliminate direct current of residual voltage and pull power supply system.
Background
In the urban rail transit industry, line faults and large current generated when vehicles are started and stopped are always important factors threatening safe operation. Therefore, preventing the direct closing of the direct current fast breaker on the fault loop is an important factor for guaranteeing safe operation. Chinese patent (patent number: ZL201110416678.4) provides a line test and protection method for a direct-current traction power supply feeder unit, effectively avoids a circuit breaker from being switched on a fault line, and does not consider the influence of the residual voltage of a contact network on the line test. The higher residual voltage value of the contact network is likely to cause that the line test cannot pass, thereby causing the result that the contact network cannot normally supply power. When general contact net residual voltage is greater than 300V, the line test can't pass, and the cubical switchboard can not close a floodgate, leads to the unable power transmission of contact net and direct influence parks.
In addition, in the traction power supply system of the urban rail transit, when maintenance operation is required, not only is line power supply disconnected due to personal safety consideration, but also a professional is required to hang a power supply line in a short circuit mode in an operation area, so that injury of personnel in the operation area due to accidental power supply is prevented. However, high voltage may remain in the overhead line system after power failure, or power transmission by mistake in the substation is encountered in the process of hanging the ground wire, so that the personnel easily get an electric shock and casualty when accidentally touching the overhead line system, and the operating personnel have great potential safety hazards.
In rail transit systems used in various places, different coping modes are adopted to reduce the influence caused by the residual voltage of a contact network. Currently, measures taken by a metro in the capital are to temporarily adjust a residual voltage detection fixed value in a line test of a direct current switch cabinet so as to avoid that a contact network cannot transmit power; the Tianjin light rail adopts the measures that the residual voltage value of the contact network is detected on site, and the residual voltage and the normal voltage are distinguished; and if the residual voltage is determined to be the residual voltage, discharging and hanging the ground wire so as to reduce the influence of the residual voltage of the contact network on the line test and the hanging of the ground wire. However, the above methods all stay in the state of manual operation, which not only wastes human resources seriously, but also causes great potential safety hazard for operators, and thus the method has far failed to meet the requirements of automation and intelligence of the power system.
At present, the residual voltage of a contact network is quickly reduced by taking effective measures so as to reduce the adverse effects on line testing and safe grounding, and the method is a common problem in the urban rail transit power supply industry in China.
Disclosure of Invention
The utility model aims at providing an eliminate direct current of residual voltage and pull power supply system has intelligence and eliminates residual voltage and contact net safety ground function.
Specifically speaking, the utility model provides a following technical scheme sets up between power supply bus and walking track, include:
the voltage detection circuit comprises a contact network voltage detection module positioned between a contact network and a walking rail, and the module detects the voltage between the contact network and the walking rail and sends the voltage to the control protection device;
the contact net residual voltage absorption loop is respectively connected with the contact net and the walking rail and absorbs the residual voltage of the contact net during working;
the isolating switch is respectively connected with the bus and the contact network, responds to the instruction of the control protection device and supplies power to the contact network or isolates the contact network from the bus;
and the control protection device acquires the voltage between the overhead line system and the traveling rail through the voltage detection circuit, and controls the residual voltage absorption circuit of the overhead line system to work until the residual voltage absorption circuit reaches a normal value when the voltage exceeds a specified threshold value.
Further, the contact net residual voltage absorption circuit comprises a suppression element and a first contactor which are connected in series between the contact net and a running rail; responding to a residual voltage absorption instruction of the control protection device, switching on the first contactor, conducting a contact net residual voltage absorption loop, and enabling the suppression element to absorb residual voltage between the contact net and the walking rail.
Furthermore, the direct-current traction power supply system also comprises a feeder-side line test triggering device, a fast circuit breaker connected in parallel with the catenary for supplying power, and a feeder-side line test is triggered in response to a feeder-side line test instruction of the control protection device; the voltage detection loop also comprises a bus voltage detection module positioned between the bus and the traveling rail and a feeder line side voltage detection module positioned between the feeder line and the traveling rail, and the bus voltage detection module and the feeder line side voltage detection module respectively detect the voltages at the bus side and the feeder line side and send the voltages to the control protection device; the control protection device acquires the bus side voltage and the feeder side voltage through the voltage detection circuit, and judges whether the bus voltage is normal or not and whether a feeder side circuit has no voltage or not; and if so, controlling the protection device to send a feeder line side line test instruction to the feeder line side line test trigger device.
Furthermore, the feeder line side circuit testing trigger device comprises a second contactor, a high-voltage fuse and a line testing resistor which are connected in series, when the feeder line side circuit testing is required, the protection device controls the coil of the second contactor to be electrified, and the contact switch of the second contactor is closed.
The power supply protection device comprises a power supply indicating circuit and an isolation indicating circuit, wherein the isolation switch is a two-station switch, one end of the isolation switch is connected with a contact network, the other end of the isolation switch is connected with a feeder line side, the third contactor drives the two-station switch to be switched on, the two-station isolation switch is located at a power supply position, and the power supply indicating circuit sends a power supply indicating signal to the control protection device; the fourth contactor drives the two-station switch to be switched off from the power supply position, and the isolation indicating circuit sends an isolation indicating signal to the control protection device after switching-off is completed.
Further, the dc traction power supply system further includes: the two button switches respectively control the power supply and the isolation operation of the isolating switch, generate corresponding power supply control signals and isolation control signals and send the corresponding power supply control signals and isolation control signals to the control protection device; when the control protection device receives the power supply control signal, the control protection device controls the third contactor to drive the two-station switch to be switched on; and when the isolation control signal is received, the fourth contactor is controlled to drive the two-station switch to be switched off from the power supply position.
The isolating switch is a three-position switch, responds to an instruction of the control protection device, supplies power to the overhead contact system, isolates or grounds the overhead contact system from a bus, is connected with the overhead contact system at a first terminal, is connected with a feeder line side at a second terminal, and is grounded at a third terminal; the third contactor drives the three-position switch to be switched on, the three-position isolating switch is positioned at a power supply position at the moment, and the power supply indicating circuit sends a power supply indicating signal to the control protection device; the fifth contactor drives the three-position switch to be switched on, the three-position isolating switch is located at the grounding position at the moment, and the grounding indicating circuit sends a grounding indicating signal to the control protection device; the fourth contactor drives the three-station switch to be switched off from the power supply position, and the isolation indicating circuit sends an isolation indicating signal to the control protection device after switching off is completed; the sixth contactor drives the three-station switch to be switched off from the grounding position, and the isolation indicating circuit sends an isolation indicating signal to the control protection device after the switching-off is finished.
Further, the dc traction power supply system further includes: the three button switches respectively control the power supply, grounding and isolation operations of the isolating switch, generate corresponding power supply control signals, isolation control signals and grounding control signals and send the corresponding power supply control signals, isolation control signals and grounding control signals to the control protection device; when the control protection device receives the power supply control signal, the control protection device controls the third contactor to drive the three-position switch to be switched on; when the isolation control signal is received, the fourth contactor is controlled by combining the received power supply indicating signal to drive the three-position switch to be switched off from the power supply position, or the sixth contactor is controlled by combining the received grounding indicating signal to drive the three-position switch to be switched off from the grounding position; and when the grounding control signal is received, controlling the fifth contactor to drive the three-position switch to be switched on.
The utility model has the advantages as follows:
the utility model discloses a direct current pulls power supply system, through addding the residual voltage absorbing device, before carrying out the line test, when detecting the contact net residual voltage too big, can carry out the residual voltage absorption earlier, when reaching normal voltage value, just allow to carry out the line test; before the isolating switch is grounded, in order to avoid personnel injury caused by residual voltage, residual voltage can be absorbed to reduce the residual voltage, and the isolating switch is grounded again until safe voltage is reached. In addition, the isolating switch is used for replacing manual operation, and potential safety hazards are reduced.
Drawings
Fig. 1 is a schematic view of the principle of residual pressure absorption in embodiments 1 and 2 of the present invention.
Fig. 2 is a schematic circuit diagram of embodiment 1 of the present invention.
Fig. 3 is a schematic circuit diagram according to embodiment 2 of the present invention.
The meaning and function of the components in fig. 2 and 3 are as follows:
r1: the device is a restraining element and is used for absorbing the residual pressure of the contact net;
k1: the first contactor contact switch is used for conducting the residual voltage absorption loop;
QF: the circuit breaker is a quick circuit breaker and is used for supplying power to a rail transit contact system;
f1: the high-voltage fuse is used for preventing the overcurrent fault of the line measurement loop;
k2: a second contactor contact switch for conducting the voltage measurement circuit;
r2: testing resistance for the circuit, and measuring the current limit of the loop; voltage class 900V: 30 Ω, voltage level 1800V: 60 omega;
u1: the bus voltage measuring amplifier is used for measuring bus voltage Ur;
u2: the feeder line voltage measurement amplifier is used for measuring the feeder line voltage Uf;
u3: the contact network voltage measuring amplifier is used for measuring the contact network voltage Uc;
q1: is a first contactor coil and is controlled by a control protection device, and a control switch K1 is turned off;
q2: is a second contactor coil and is controlled by a control protection device, and the control switch K2 is turned off;
q3: is a third contactor coil and is controlled by a control protection device, and the control switch K3 is turned off;
q4: the fourth contactor coil is controlled by a control protection device, and the control switch K4 is turned off;
q5: the fifth contactor coil is controlled by a control protection device, and the control switch K5 is turned off;
q6: the sixth contactor coil is controlled by a control protection device, and the control switch K6 is turned off;
k3: the third contactor contact switch is used for conducting a forward loop of the motor to drive the isolating switch to switch on, the isolating switch is positioned at a power supply position (the moving contact of the isolating switch is positioned at a position of '1'), and the bus voltage supplies power to a contact network through the QF and the isolating switch, namely a power supply line is conducted;
k4: the fourth contactor contact switch is used for conducting a reverse loop of the motor to drive the isolating switch to be switched off, the isolating switch is positioned at an isolating position (the moving contact of the isolating switch is positioned at the position of '0'), and the contact network is isolated from a power supply line and a grounding line;
k5: the fifth contactor contact switch is used for conducting a reverse loop of the motor to drive the isolating switch to switch on, the isolating switch is at a grounding position (the moving contact of the isolating switch is at a position of 2), and the contact net is conducted with the return rail through a grounding wire, namely, a grounding line is conducted;
k6: the sixth contactor contact switch is used for conducting a forward loop of the motor to drive the isolating switch to be switched off, the isolating switch is positioned at an isolating position (the moving contact of the isolating switch is positioned at the position of '0'), and the contact network is isolated from a power supply line and a grounding line at the moment;
e1: the switch is a button switch and controls the disconnecting switch to be switched on and powered;
e2: the switch is a button switch and controls the disconnecting switch to be switched on, supply power and be grounded;
e3: is a button switch and controls the disconnecting switch to be separated;
k3-1, K3-2, K3-3: is an auxiliary contact of the contact switch K3;
k4-1, K4-2, K4-3: is an auxiliary contact of the contact switch K4;
k5-1, K5-2, K5-3: is an auxiliary contact of the contact switch K5;
k6-1, K6-2, K6-3: is an auxiliary contact of the contact switch K6;
QS: the three-station isolating switch can realize three functions of power supply, isolation and grounding, can form a direct current 750V/1500V loop between a contact net (rail) and a walking rail, and can also safely ground the contact net during equipment maintenance.
QS: the two-station isolating switch can realize two functions of power supply and isolation, and a direct-current 750V/1500V loop can be formed between a contact net (rail) and a walking rail.
QS1-1a, QS1-1b, QS 1-2: and isolating switch auxiliary contacts. When the isolating switch is switched on (the movable contact moves from the position of 0 to 1), QS1-1b and QS1-2 are changed from normally open to normally closed, QS1-1a is changed from normally closed to normally open, and a pin connected with QS1-2 of the control protection device A0 generates a high-level signal which is a power supply indicating signal; when the isolating switch is opened (the movable contact moves from the position of 1 to 0), QS1-1a, QS1-1b and QS1-2 are restored to the original positions (called reset).
QS2-1a, QS2-1b, QS 2-2: and isolating switch auxiliary contacts. When the isolating switch is switched on (the movable contact moves from the position of 0 to 2), QS2-1b and QS2-2 are changed from normally open to normally closed, QS2-1a is changed from normally closed to normally open, and a pin connected with QS2-2 of the control protection device A0 generates a high-level signal which is a grounding indication signal; when the isolating switch is opened (the movable contact moves from the position of 2 to 0), QS2-1a, QS2-1b and QS2-2 are restored to the original positions (called reset).
QS 0-1: an auxiliary contact of the isolating switch, wherein when the isolating switch is switched on (the movable contact moves from the position of 0 to 1 or from the position of 0 to 2), QS0-1 is changed from normally closed to normally open; controlling a pin of a protection device A0 connected with QS0-1 to generate a low level signal, wherein the isolation indication signal disappears; when the isolating switch is opened (the movable contact moves from the position "1" to the position "0" or the movable contact moves from the position "2" to the position "0"), the QS0-1 restores the original position (reset), and the pin of the control protection device A0 connected with the QS0-1 generates a high level signal, which is an isolating indication signal.
A0: the control protection device and the controller can receive and process bus voltage signals, feeder voltage signals, contact network voltage signals and grounding, isolating and power supply indicating signals of the isolating switch, and can also control the on-off of the contactor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings in conjunction with embodiments.
Example 1:
an embodiment of the present invention is a dc traction power supply system for eliminating residual voltage. As shown in fig. 1, a residual voltage absorption loop (including a suppression element and a contactor) of the overhead line system is added between the overhead line system and the walking rail, a voltage sampling loop of the overhead line system is added, and the suppression element and the contactor are used for realizing the residual voltage absorption of the overhead line system by relying on an existing control protection device in a feeder line test system.
Before a feeder line test is carried out, the control protection device judges whether the residual voltage between the overhead line system and the walking rail exceeds a threshold value or not through the received voltage sampling signal. When the residual voltage exceeds the threshold value, the control protection device controls the contactor to be switched on, the residual voltage absorption loop is conducted, the suppression element absorbs the residual voltage, the feeder line test is carried out until the voltage of the contact network reaches the normal voltage, and the feeder circuit breaker is switched on until the line test is passed.
When equipment maintenance and overhaul are needed, before the upper net isolation switch is grounded, the control protection device judges whether residual voltage exists between the contact net and the walking rail or not and whether the residual voltage exceeds a threshold value or not according to the received voltage sampling signal. When the residual voltage exceeds the threshold value, the residual voltage is restrained by the residual voltage absorption unit, and the isolating switch is controlled to be grounded after the safe voltage is reached.
In the dc traction power supply system with the functions of intelligently eliminating residual voltage and safely grounding a contact network as shown in fig. 2, the working principle is as follows.
The judgment and absorption process of the contact net residual pressure:
before line test and before three-station disconnecting switch ground connection, all need carry out the judgement of contact net residual voltage to carry out the contact net residual voltage absorption when necessary, three-station disconnecting switch is in the isolated state this moment. The process is as follows:
the voltage measurement amplifier U3 sends the acquired voltage signal of the contact network to the control protection device, the protection device receives the voltage signal and distinguishes residual voltage and normal voltage, if the residual voltage is determined (according to working conditions, the range is 0V to 1500V, and the like), the coil Q1 of the contactor is controlled to be electrified, the Q1 enables the switch K1 of the contactor to be closed, the residual voltage absorption loop is conducted, the suppression element R1 (the power requirement is more than or equal to 30W, the impedance is more than or equal to 160K omega, and less than or equal to 240K omega) absorbs the residual voltage until the normal voltage is reached, and the control protection device controls the residual voltage absorption unit to stop residual voltage absorption work.
The line testing process comprises the following steps:
before the direct current quick circuit breaker QF is switched on, after the residual voltage absorption work is finished, a line test is carried out. Bus voltage measuring amplifier U1 and feeder voltage measuring amplifier U2 measure bus voltage U in DC traction systemrAnd a feeder side voltage Uf(ii) a Control protection device A0 obtains bus voltage UrAnd a feeder side voltage UfIf the bus voltage U appearsrNot less than the minimum working voltage U of the feederflowAnd the feeder line voltage UfNo greater than set residual voltage UfresidueThe bus voltage is normal, and no voltage exists in a feeder line side circuit; at this time, because the residual voltage has disappeared, the method of measuring the line resistance can be used to judge whether the line is normal. Before adding the residual voltage absorbing unit, this method (method for measuring the line resistance) is subject toThe influence of residual voltage, which is likely to cause the line test to fail, affects normal power supply. The method specifically comprises the following steps: the control protection device controls the contactor coil Q2 to be electrified, so that the contactor contact switch K2 is closed, the bus voltage is applied to the feeder side through F1 and R2, and the device calculates the feeder side loop resistance Rre. The calculation method is as follows:
Rre＝R2*Uf/((Ur-Uf)Rcalibration)；
wherein R iscalibrationThe resistance is calibrated for a circuit, and is used for compensating the precision error of the line R2, and the value range is 27000-65000 m omega (milliohm).
If the loop resistance R at the feed line sidereExceeds a threshold value Rmin(RminThe value range of (1) is 300-10000 m omega), namely Rre≥RminIf the feeder circuit is not in fault, the direct current fast breaker can be switched on directly; if the loop resistance R on the feeder side is measuredre＜RminIf the circuit is short-circuited, the control protection device A0 sends out a signal for locking the quick breaker QF to close.
The safe grounding process of the contact network:
1) initial state
The three-station isolating switch QS is in an isolating position, the auxiliary contact QS0-1 is in a closed state, the isolating indication circuit is in a conducting state to send an isolating indication signal, and the control protection device A0 judges that the isolating switch is in an isolating position by receiving the isolating indication signal and displays the current isolating state (or an indicator lamp) through a display.
2) Power supply and isolation
Power supply:
when a three-station isolating switch QS is required to be switched on to supply power, a button E1 is pressed, a power supply control signal circuit is conducted, a control protection device A0 receives a power supply control signal, if the three-station isolating switch is judged to be in an isolating position at the moment, a contactor coil Q3 is rapidly controlled to be electrified, a contactor switch K3 is closed by Q3, a forward loop of a motor is conducted to drive the isolating switch to be switched on, the isolating switch is in a power supply position (1 position) at the moment, bus voltage supplies power to a contact net through QF and the isolating switch, and a power supply line is normally conducted to supply power.
When the coil Q3 is energized, the auxiliary contact K3-3 is closed, keeping the circuit conductive.
When the coil Q3 is electrified, the auxiliary contact K3-1 is opened, the Q4 is ensured to be in an open circuit state, and the phenomenon that a contact net is triggered to be isolated from a power supply line and a grounding line due to misoperation (such as mistakenly pressing an isolation button or controlling a protection device to send a signal) is avoided, so that influence is brought to the power supply of the closing of the isolating switch.
When the coil Q3 is electrified, the auxiliary contact K3-2 is opened, the Q5 is ensured to be in an open circuit state, and the condition that the grounding circuit of a contact net is triggered to be conducted due to misoperation (such as mistakenly pressing a grounding button or controlling a protection device to send a signal) is avoided, so that influence is brought to the power supply of the closing of the isolating switch.
The QS switch of the three-station isolating switch drives the QS1-1a to be switched off, the control loop of the contactor coil Q3 is switched off, the contactor coil Q3 is switched off, and the corresponding contactor switch K3 and the auxiliary contacts K3-1, K3-2 and K3-3 are reset.
The QS switch-on of the three-station isolating switch drives the QS1-1b to be closed, the Q4 control loop of the contactor coil is switched on, and the isolating switch can be controlled to return to the 0 position through E3.
The QS switch-on of the three-station isolating switch drives the QS1-2 to be closed, the power supply indicating circuit is switched on to send a power supply indicating signal, and the control protection device A0 judges that the isolating switch is in the power supply switch-on position by receiving the power supply indicating signal and displays the current power supply state (or an indicating lamp) through the display.
And the QS switch of the three-station isolating switch is switched on to drive the QS0-1 to be switched off, and the isolation indicating circuit is in a power-off state.
Isolation:
when the three-position isolating switch needs to be powered off and isolated, the button E3 is pressed, the isolating control signal circuit is conducted, the control protection device A0 receives an isolating control signal, if the three-position isolating switch is judged to be in the power supply position at the moment, the contactor coil Q4 is rapidly controlled to be powered on (the coil Q6 is connected with the coil Q4 in parallel and controlled by the same output point of A0, but the Q6 control circuit is in the open circuit state at the moment, the Q6 cannot be powered on), the Q4 enables the contactor switch K4 to be closed, the reverse circuit of the motor is conducted, the isolating switch is driven to be switched off, the isolating switch is in the isolating position (0 position) at the moment, and a contact net is.
When the coil Q4 is energized, the auxiliary contact K4-3 is closed, keeping the circuit conductive.
When the coil Q4 is electrified, the auxiliary contact K4-1 is opened, the Q3 is ensured to be in an open circuit state, and the condition that the power supply line of a contact net is switched on by misoperation (mistakenly pressing a power supply button or controlling a protection device to send a signal) is avoided, so that the influence is brought to the opening and the isolation of the isolating switch.
When the coil Q4 is electrified, the auxiliary contact K4-2 is opened, the Q6 is ensured to be in an open circuit state, and the phenomenon that the movement directions of the K6 and the K4 are inconsistent and misoperation (the control protection device sends signals by mistake) occurs is avoided, so that the influence is brought to the opening isolation of the isolating switch.
The three-station isolating switch QS is switched off to drive the linkage auxiliary contact QS1-1b to be switched off, the control loop of the contactor coil Q4 is switched off, the contactor coil Q4 is switched off, and the corresponding contactor switch K4 and the auxiliary contacts K4-1, K4-2 and K4-3 are reset.
The QS opening of the three-station isolating switch drives the QS1-1a to be closed, the Q3 control loop of the contactor coil is connected, and the E1 can control the isolating switch to return to the 1 position.
The three-station isolating switch QS is switched off to drive the linkage auxiliary contact QS0-1 to be closed, the isolation indicating circuit is switched on to send an isolation indicating signal, and the control protection device A0 judges that the isolating switch is in an isolation position by receiving the isolation indicating signal and displays the current isolation state (or an indicating lamp) through the display.
And the QS opening of the three-station isolating switch drives the QS1-2 to be disconnected, and the power supply indicating circuit is in a power-off state.
3) Grounding and isolation
Grounding:
when power is required to be cut off for maintenance operation, personal consideration is taken, and after the circuit breaker is disconnected, the contact network is required to be grounded. The residual voltage absorption unit is required to be used for residual voltage absorption before grounding, so that the phenomenon that the circuit is tripped to influence normal power supply due to grounding in a charged state is avoided. The residual pressure judgment absorption process is as follows:
disconnecting the short-circuiting device QF, enabling the three-station isolating switch to be in an isolating position, detecting the voltage between the contact net and the negative electrode by the voltage measuring amplifier U3, controlling the protection device to receive the voltage, and if no voltage or safe voltage is judged, grounding the three-station isolating switch; if the voltage exceeds the safety voltage, the coil Q1 of the contactor is controlled to be electrified, the Q1 enables the contactor switch K1 to be closed, the residual voltage absorption loop is conducted, the restraining element R1 absorbs residual voltage until the voltage reaches the safety voltage, the three-station isolating switch is controlled to be grounded, the grounding does not need to be manually operated in a close range during grounding, the grounding is controlled only through remote control, and personal safety is guaranteed. The grounding process is as follows:
when the three-station disconnecting switch QS needs to be switched on and grounded, the button E2 is pressed, the grounding control signal circuit is conducted, the control protection device A0 receives the grounding control signal at the moment, if the three-station disconnecting switch is judged to be in the isolating position at the moment, the contactor coil Q5 is rapidly controlled to be electrified, the contactor switch K5 is closed by the contactor coil Q5, the reverse circuit of the motor is conducted, the disconnecting switch is driven to be switched on, at the moment, the disconnecting switch is in the grounding position (2), the contact net is conducted with the return rail through the grounding wire, and the grounding circuit is conducted.
When the coil Q5 is energized, the auxiliary contact K5-3 is closed, keeping the circuit conductive.
When the coil Q5 is electrified, the auxiliary contact K5-1 is opened, the Q3 is ensured to be in an open circuit state, and the condition that the power supply line of a contact net is switched on by misoperation (mistakenly pressing a power supply button or controlling a protection device to send a signal) is avoided, so that the influence on the closing and grounding of the isolating switch is brought.
When the coil Q5 is electrified, the auxiliary contact K5-2 is opened, the Q6 is ensured to be in an open circuit state, and the phenomenon that a contact net is triggered to be isolated from a power supply line and a grounding line by misoperation (mistakenly pressing an isolation button or controlling a protection device to send a signal by mistake) is avoided, so that influence is brought to the closing and grounding of the isolating switch.
The QS switch of the three-station isolating switch drives the QS2-1a to be switched off, the control loop of the contactor coil Q5 is switched off, the contactor coil Q5 is switched off, and the corresponding contactor switch K5 and the auxiliary contacts K5-1, K5-2 and K5-3 are reset.
The QS switch-on of the three-station isolating switch drives the QS2-1b to be closed, the Q6 control loop of the contactor coil is switched on, and the isolating switch can be controlled to return to the 0 position through E3.
The QS switch-on of the three-station isolating switch drives the QS2-2 to be closed, the grounding indication circuit is conducted to send a grounding indication signal, and the control protection device A0 judges that the isolating switch is at the grounding switch-on position by receiving the grounding indication signal and displays the current grounding state (or through an indicator lamp) through a display.
And the QS switch of the three-station isolating switch is switched on to drive the QS0-1 to be switched off, and the isolation indicating circuit is in a power-off state.
Isolation:
when the three-position isolating switch needs to be powered off and isolated, the button E3 is pressed, the isolating control signal circuit is conducted, the control protection device A0 receives an isolating control signal, if the three-position isolating switch is judged to be in the grounding position at the moment, the contactor coil Q6 is rapidly controlled to be electrified (the coil Q6 is connected with the coil Q4 in parallel and controlled by the same output point of A0, but the Q4 control circuit is in the open circuit state at the moment, the Q4 cannot be electrified), the Q6 enables the contactor switch K6 to be closed, the forward loop of the motor is conducted, the isolating switch is driven to be switched off, the isolating switch is in the isolating position (position 0) at the moment, and the contact net is isolated from a power.
When the coil Q6 is energized, the auxiliary contact K6-3 is closed, keeping the circuit conductive.
When the coil Q6 is electrified, the auxiliary contact K6-1 is opened, the Q4 is ensured to be in an open circuit state, and the phenomenon that the movement directions of the K4 and the K6 are inconsistent and misoperation (the control protection device sends signals by mistake) occurs is avoided, so that the influence is brought to the opening isolation of the isolating switch.
When the coil Q6 is electrified, the auxiliary contact K6-2 is opened, the Q5 is ensured to be in an open circuit state, and the condition that the grounding circuit of a contact net is switched on by misoperation (mistakenly pressing a grounding button or controlling a protection device to send a signal) is avoided, so that the influence is brought to the opening isolation of the isolating switch.
The three-station isolating switch QS is switched off to drive the linkage auxiliary contact QS2-1b to be switched off, the control loop of the contactor coil Q6 is switched off, the contactor coil Q6 is switched off, and the corresponding contactor switch K6 and the auxiliary contacts K6-1, K6-2 and K6-3 are reset.
The QS opening of the three-station isolating switch drives the QS2-1a to be closed, the Q5 control loop of the contactor coil is connected, and the isolating switch can be controlled to return to the 2 position through E2.
The three-station isolating switch QS is switched off to drive the linkage auxiliary contact QS0-1 to be closed, the isolation indicating circuit is switched on to send an isolation indicating signal, and the control protection device A0 judges that the isolating switch is in an isolation position by receiving the isolation indicating signal and displays the current isolation state (or an indicating lamp) through the display.
And the three-station disconnecting switch QS is switched off to drive the linkage auxiliary contact QS2-2 to be switched off, and the grounding indication circuit is in a power-off state.
Example 2:
another embodiment of the present invention is a dc traction power supply system for eliminating residual voltage. As shown in fig. 3, the same as in embodiment 1 is that a contact net residual voltage absorbing circuit (including a suppression element and a contactor) and a contact net voltage sampling circuit are arranged between the contact net and the traveling rail, and the contact net residual voltage absorbing circuit is controlled to realize the absorption of the contact net residual voltage by controlling the protection device; the difference from embodiment 1 is that a two-position disconnecting switch is used instead of a three-position disconnecting switch.
The judgment of the contact net residual voltage is needed before the line test, and the contact net residual voltage absorption is carried out when necessary, at the moment, the two-station isolating switch is in an isolating state, and the judgment and absorption process of the contact net residual voltage is similar to that in the embodiment 1.
The two-position disconnecting switch in the dc traction power supply system with the intelligent residual voltage eliminating function shown in fig. 3 operates as follows.
1) Initial state
The two-station isolating switch QS is in an isolating position, the auxiliary contact QS0-1 is in a closed state, the isolating indication circuit is in a conducting state to send an isolating indication signal, and the control protection device A0 judges that the isolating switch is in an isolating position by receiving the isolating indication signal and displays the current isolating state (or an indicator lamp) through a display.
2) Power supply and isolation
Power supply:
when a two-station isolating switch QS needs to be switched on to supply power, a button E1 is pressed, a power supply control signal circuit is switched on, a control protection device A0 receives a power supply control signal, if the isolating switch is judged to be in an isolating position at the moment, a contactor coil Q3 is rapidly controlled to be powered on, a contactor switch K3 is closed by Q3, a forward loop of a motor is switched on to drive the isolating switch to be switched on, the isolating switch is in a power supply position (1 position) at the moment, and a power supply line is normally switched on to supply power.
When the coil Q3 is energized, the auxiliary contact K3-2 is closed, keeping the circuit conductive.
When the coil Q3 is electrified, the auxiliary contact K3-1 is opened, the Q4 is ensured to be in an open circuit state, and the phenomenon that a contact net is triggered to be isolated from a power supply line by misoperation (mistakenly pressing an isolation button or controlling a protection device to mistakenly send a signal) is avoided, so that influence is brought to the closing power supply of the isolating switch.
And (3) the QS switch is switched on to drive the QS1-1a to be disconnected, the Q3 control loop of the contactor coil is powered off, the Q3 of the contactor coil is powered off, and the corresponding K3 of the contactor switch and the auxiliary contacts K3-1 and K3-2 are reset.
The QS switch-on of the two-station isolating switch drives the QS1-1b to be closed, the Q4 control loop of the contactor coil is switched on, and the isolating switch can be controlled to return to the 0 position through E2.
The two-station isolating switch QS is switched on to drive the linkage auxiliary contact QS1-2 to be switched on, the power supply indicating circuit is switched on to send a power supply indicating signal, and the control protection device A0 judges that the isolating switch is in the power supply switching-on position by receiving the power supply indicating signal and displays the current power supply state (or an indicating lamp) through the display.
And (4) switching on a two-station isolating switch QS to drive a linkage auxiliary contact QS0-1 to be disconnected, and isolating the indicating line to be in a power-off state.
Isolation:
when the two-station isolating switch needs to be powered off and isolated, the button E2 is pressed, the isolating control signal circuit is conducted, the control protection device A0 receives the isolating control signal at the moment, the contactor coil Q4 is rapidly controlled to be electrified, the contactor switch K4 is closed by the Q4, the reverse circuit of the motor is conducted, the isolating switch is driven to be switched off, the isolating switch is located at an isolating position (a '0' position), and the contact net is isolated from a power supply circuit at the moment.
When the coil Q4 is energized, the auxiliary contact K4-2 is closed, keeping the circuit conductive.
When the coil Q4 is electrified, the auxiliary contact K4-1 is opened, the Q3 is ensured to be in an open circuit state, and the condition that the power supply line of a contact net is switched on by misoperation (mistakenly pressing a power supply button or controlling a protection device to send a signal) is avoided, so that the influence is brought to the opening and the isolation of the isolating switch.
And (3) opening the gate of a two-station isolating switch QS to drive a linkage auxiliary contact QS1-1b to be disconnected, powering off a control loop of a contactor coil Q4, powering off a contactor coil Q4 at the moment, and resetting a corresponding contactor switch K4 and auxiliary contacts K4-1 and K4-2.
The two-station isolating switch QS is switched off to drive the linkage auxiliary contact QS1-1a to be closed, the contactor coil Q3 control loop is switched on, and at the moment, the isolating switch is controlled to return to the 1 position through E1.
The two-station isolating switch QS is switched off to drive the linkage auxiliary contact QS0-1 to be closed, the isolation indicating circuit is switched on to send an isolation indicating signal, and the control protection device A0 judges that the isolating switch is in an isolation position by receiving the isolation indicating signal and displays the current isolation state (or an indicating lamp) through the display.
And (3) opening the gate of a two-station isolating switch QS to drive a linkage auxiliary contact QS1-2 to be disconnected, and supplying power to indicate that the circuit is in a power-off state.
Although the present invention has been described with reference to the preferred embodiments, the embodiments are not intended to limit the present invention. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of protection of the invention should therefore be determined with reference to the claims that follow.
Claims (8)
1. The utility model provides an eliminate direct current of residual voltage and pull power supply system, sets up between power supply bus and the walking rail, its characterized in that includes:
the voltage detection circuit comprises a contact network voltage detection module positioned between a contact network and a walking rail, and the module detects the voltage between the contact network and the walking rail and sends the voltage to the control protection device;
the contact net residual voltage absorption loop is respectively connected with the contact net and the walking rail and absorbs the residual voltage of the contact net during working;
the isolating switch is respectively connected with the bus and the contact network, responds to the instruction of the control protection device and supplies power to the contact network or isolates the contact network from the bus;
and the control protection device acquires the voltage between the overhead line system and the traveling rail through the voltage detection circuit, and controls the residual voltage absorption circuit of the overhead line system to work until the residual voltage absorption circuit reaches a normal value when the voltage exceeds a specified threshold value.
2. The direct-current traction power supply system for eliminating residual voltage according to claim 1, wherein the contact net residual voltage absorption loop comprises a suppression element and a first contactor which are connected in series between a contact net and a running rail; responding to a residual voltage absorption instruction of the control protection device, switching on the first contactor, conducting a contact net residual voltage absorption loop, and enabling the suppression element to absorb residual voltage between the contact net and the walking rail.
3. The direct-current traction power supply system for eliminating residual voltage according to claim 1, further comprising a feeder-side line test triggering device, connected in parallel to a fast breaker for supplying power to a catenary, for triggering a feeder-side line test in response to a feeder-side line test instruction of the control protection device;
the voltage detection loop also comprises a bus voltage detection module positioned between the bus and the traveling rail and a feeder line side voltage detection module positioned between the feeder line and the traveling rail, and the bus voltage detection module and the feeder line side voltage detection module respectively detect the voltages at the bus side and the feeder line side and send the voltages to the control protection device;
the control protection device acquires the bus side voltage and the feeder side voltage through the voltage detection circuit, and judges whether the bus voltage is normal or not and whether a feeder side circuit has no voltage or not; and if so, controlling the protection device to send a feeder line side line test instruction to the feeder line side line test trigger device.
4. The DC traction power supply system for eliminating the residual voltage according to claim 3, wherein the feeder side line test triggering device comprises a second contactor, a high voltage fuse and a line test resistor which are connected in series, when the feeder side line test is required, the protection device controls the coil of the second contactor to be electrified, and the contact switch of the second contactor is closed.
5. The direct current traction power supply system for eliminating residual voltage according to any one of claims 1 to 4, further comprising a power supply indicating circuit and an isolation indicating circuit, wherein the isolation switch is a two-position switch, one end of the isolation switch is connected with a contact network, the other end of the isolation switch is connected with a feeder line side,
the third contactor drives the two-station switch to be switched on, the two-station isolating switch is positioned at a power supply position at the moment, and the power supply indicating circuit sends a power supply indicating signal to the control protection device;
the fourth contactor drives the two-station switch to be switched off from the power supply position, and the isolation indicating circuit sends an isolation indicating signal to the control protection device after switching-off is completed.
6. The residual voltage elimination DC traction power supply system according to claim 5, further comprising:
the two button switches respectively control the power supply and the isolation operation of the isolating switch, generate corresponding power supply control signals and isolation control signals and send the corresponding power supply control signals and isolation control signals to the control protection device;
when the control protection device receives the power supply control signal, the control protection device controls the third contactor to drive the two-station switch to be switched on; and when the isolation control signal is received, the fourth contactor is controlled to drive the two-station switch to be switched off from the power supply position.
7. The direct-current traction power supply system for eliminating residual voltage according to any one of claims 1 to 4, further comprising a power supply indicating circuit, a grounding indicating circuit and an isolation indicating circuit, wherein the isolation switch is a three-position switch, responds to an instruction of the control protection device, supplies power to a contact network, isolates or grounds the contact network from a bus, the first terminal is connected with the contact network, the second terminal is connected with a feeder line side, and the third terminal is grounded;
the third contactor drives the three-position switch to be switched on, the three-position isolating switch is positioned at a power supply position at the moment, and the power supply indicating circuit sends a power supply indicating signal to the control protection device;
the fifth contactor drives the three-position switch to be switched on, the three-position isolating switch is located at the grounding position at the moment, and the grounding indicating circuit sends a grounding indicating signal to the control protection device;
the fourth contactor drives the three-station switch to be switched off from the power supply position, and the isolation indicating circuit sends an isolation indicating signal to the control protection device after switching off is completed;
the sixth contactor drives the three-station switch to be switched off from the grounding position, and the isolation indicating circuit sends an isolation indicating signal to the control protection device after the switching-off is finished.
8. The residual voltage elimination DC traction power supply system according to claim 7, further comprising:
the three button switches respectively control the power supply, grounding and isolation operations of the isolating switch, generate corresponding power supply control signals, isolation control signals and grounding control signals and send the corresponding power supply control signals, isolation control signals and grounding control signals to the control protection device;
when the control protection device receives the power supply control signal, the control protection device controls the third contactor to drive the three-position switch to be switched on; when the isolation control signal is received, the fourth contactor is controlled by combining the received power supply indicating signal to drive the three-position switch to be switched off from the power supply position, or the sixth contactor is controlled by combining the received grounding indicating signal to drive the three-position switch to be switched off from the grounding position; and when the grounding control signal is received, controlling the fifth contactor to drive the three-position switch to be switched on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921239646.XU CN210111605U (en) | 2019-08-02 | 2019-08-02 | DC traction power supply system for eliminating residual voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921239646.XU CN210111605U (en) | 2019-08-02 | 2019-08-02 | DC traction power supply system for eliminating residual voltage |
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| Publication Number | Publication Date |
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| CN210111605U true CN210111605U (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921239646.XU Withdrawn - After Issue CN210111605U (en) | 2019-08-02 | 2019-08-02 | DC traction power supply system for eliminating residual voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380399A (en) * | 2019-08-02 | 2019-10-25 | 镇江大全赛雪龙牵引电气有限公司 | A kind of DC traction power-supply system for eliminating residual voltage |
-
2019
- 2019-08-02 CN CN201921239646.XU patent/CN210111605U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380399A (en) * | 2019-08-02 | 2019-10-25 | 镇江大全赛雪龙牵引电气有限公司 | A kind of DC traction power-supply system for eliminating residual voltage |
| CN110380399B (en) * | 2019-08-02 | 2024-05-07 | 镇江大全赛雪龙牵引电气有限公司 | DC traction power supply system for eliminating residual voltage |
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