CN110380399B - DC traction power supply system for eliminating residual voltage - Google Patents
DC traction power supply system for eliminating residual voltage Download PDFInfo
- Publication number
- CN110380399B CN110380399B CN201910710150.4A CN201910710150A CN110380399B CN 110380399 B CN110380399 B CN 110380399B CN 201910710150 A CN201910710150 A CN 201910710150A CN 110380399 B CN110380399 B CN 110380399B
- Authority
- CN
- China
- Prior art keywords
- power supply
- voltage
- switch
- protection device
- contactor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 238000010521 absorption reaction Methods 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000002955 isolation Methods 0.000 claims description 50
- 230000004044 response Effects 0.000 claims description 5
- 230000001629 suppression Effects 0.000 claims description 5
- 230000002401 inhibitory effect Effects 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 16
- 230000002441 reversible effect Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a direct-current traction power supply system for eliminating residual voltage, and belongs to the technical field of rail power supply. The invention is arranged between a power supply bus and a running rail, and comprises: the voltage detection loop detects the voltage between the contact net and the running rail and sends the voltage to the control protection device; the residual voltage absorption loop of the contact net is respectively connected with the contact net and the running rail to absorb residual voltage of the contact net; the isolating switch is used for responding to the instruction of the control protection device to supply power to the overhead contact system or isolate the overhead contact system from the bus or ground the overhead contact system; and controlling the protection device to acquire the voltage between the contact net and the running rail, and controlling the residual voltage absorption loop of the contact net to work until the voltage reaches a normal value when the voltage exceeds a specified threshold value. The invention can effectively and rapidly absorb the residual pressure of the contact net; the circuit test is effectively carried out, and the switching-on of the circuit breaker to a fault circuit is avoided; residual voltage is quickly absorbed before the contact net is grounded, so that the disconnecting switch is ensured to be grounded in an uncharged state.
Description
Technical Field
The invention belongs to the technical field of rail power supply, and particularly relates to a direct-current traction power supply system for eliminating residual voltage.
Background
In the urban rail transit industry, line faults and large currents generated when vehicles start and stop are always important factors threatening safety operation. Therefore, preventing direct switching on of the direct current quick breaker on the fault loop is an important factor for ensuring safe operation. The Chinese patent (patent number: ZL 201110416678.4) proposes a method for testing and protecting the line of a direct-current traction power supply feeder unit, which effectively avoids the switching-on of a breaker to a fault line, but does not consider the influence of residual voltage of a contact net on the line test. The high residual voltage value of the contact net is likely to cause that the line test is not passed, so that the contact net cannot normally supply power. When the residual voltage of the common contact net is greater than 300V, the line test cannot pass, and the switch cabinet cannot be closed, so that the contact net cannot transmit power and the parking is directly affected.
In addition, in the traction power supply system of urban rail transit, when maintenance operation is needed, line power supply is disconnected due to personal safety, and meanwhile, a professional is needed to hang the power supply line in a short circuit in an operation area so as to prevent personnel injury in the operation area caused by accidental power supply. However, the overhead line after power failure is still likely to remain high voltage, or the ground wire is hung and is met the condition that the substation is transmitted by mistake in the process, personnel are very easy to cause personal electric shock casualties when carelessly touching the overhead line, and the operating personnel have very big potential safety hazard.
In rail transit systems used in various places, different coping modes are adopted to reduce the influence caused by the residual pressure of the overhead contact system. Currently, measures adopted by the adult subways are that the residual voltage detection fixed value in the line test of the direct current switch cabinet is temporarily adjusted so as to avoid that the contact net cannot transmit power; the method is characterized in that the Tianjin light rail adopts the measures that the residual voltage value of the contact net is detected on site to distinguish the residual voltage from the normal voltage; 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 net on the line test and the ground wire hanging. However, the method stays in a manual operation state, so that not only is the manpower resource wasted seriously, but also the operator has great potential safety hazard, and the requirements of automation and intellectualization of the power system can not be met.
At present, the residual voltage of the overhead line system is reduced rapidly by taking effective measures so as to reduce the adverse effects on line test and safe grounding, which is a common problem facing the urban rail transit power supply industry in China.
Disclosure of Invention
The invention aims to provide a direct current traction power supply system for eliminating residual voltage, which has the functions of intelligently eliminating residual voltage and safely grounding a contact net.
Specifically, the invention provides the following technical scheme, which is arranged between a power supply bus and a running rail and comprises the following steps:
The voltage detection loop comprises a contact network voltage detection module positioned between the contact network and the running rail, and the voltage detection module detects the voltage between the contact network and the running rail and sends the voltage to the control protection device;
the residual voltage absorption loop of the contact net is respectively connected with the contact net and the shape-changing rail, and absorbs residual voltage of the contact net when in operation;
the isolating switch is respectively connected with the bus and the contact net, and responds to the instruction of the control protection device to supply power to the contact net or isolate the contact net from the bus;
And controlling the protection device, acquiring the voltage between the contact net and the running rail through the voltage detection loop, and controlling the residual voltage absorption loop of the contact net to work until reaching a normal value when the voltage exceeds a specified threshold value.
Further, the overhead contact system residual voltage absorption loop comprises a suppression element and a first contactor which are connected in series between the overhead contact system and the running rail; in response to a residual voltage absorption instruction of the control protection device, the first contactor is switched on, the residual voltage absorption loop of the contact net is conducted, and the inhibiting element absorbs residual voltage between the contact net and the running rail.
Further, the direct current traction power supply system further comprises a feeder line side line test triggering device, the feeder line side line test triggering device is connected in parallel with a quick breaker used for power supply of the overhead line system, and the feeder line side line test triggering device is used for triggering feeder line side line test in response to a feeder line 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 running rail and a feeder side voltage detection module positioned between the feeder and the running rail, and the voltages of the bus side and the feeder side are respectively detected and sent to the control protection device; the control protection device acquires bus side voltage and feeder side voltage through the voltage detection loop and judges whether the bus voltage is normal or not and the feeder side line has no voltage; if yes, the control protection device sends a feeder line side line testing instruction to the feeder line side line testing triggering device.
Furthermore, the feeder line side line test triggering device comprises a second contactor, a high-voltage fuse and a line test resistor which are connected in series, and when the feeder line side line test is required, the protection device controls the second contactor coil to be electrified, and a second contactor contact switch is closed.
The power supply control protection device further comprises a power supply indication circuit and an isolation indication circuit, wherein the isolation switch is a two-station switch, one end of the isolation switch is connected with the contact net, the other end of the isolation switch is connected with the feeder line side, the third contactor drives the two-station switch to be switched on, and at the moment, the two-station isolation switch is positioned at a power supply position, and the power supply indication circuit sends a power supply indication signal to the control protection device; the fourth contactor drives the two-station switch to be opened from the power supply position, and the isolation indication circuit sends an isolation indication signal to the control protection device after the opening is completed.
Further, the direct current traction power supply system further comprises: the two button switches respectively control the power supply and isolation operation of the isolating switch, generate corresponding power supply control signals and isolation control signals and send the power supply control signals and the isolation control signals to the control protection device; when the control protection device receives a power supply control signal, the third contactor is controlled to drive the two-station switch to be switched on; when the isolation control signal is received, the fourth contactor is controlled to drive the two-station switch to be opened from the power supply position.
The power supply system comprises a control protection device, a power supply indication circuit, a grounding indication circuit, an isolation indication circuit, a three-position switch and a power supply control circuit, wherein the control protection device is used for controlling the power supply of the contact net, isolating or grounding the contact net and a bus, a first terminal is connected with the contact net, a second terminal is connected with a feeder line side, and a third terminal is grounded; the third contactor drives the three-position switch to be switched on, at the moment, the three-position isolating switch is positioned at a power supply position, and the power supply indication circuit sends a power supply indication signal to the control protection device; the fifth contactor drives the three-position switch to be switched on, at the moment, the three-position isolating switch is positioned at a grounding position, and the grounding indication circuit sends a grounding indication signal to the control protection device; the third station switch is driven by the fourth contactor to be opened from the power supply position, and the isolation indication circuit sends an isolation indication signal to the control protection device after the opening is completed; the third station switch is driven by the sixth contactor to be opened by the grounding position, and the isolation indication circuit sends an isolation indication signal to the control protection device after the opening is completed.
Further, the direct current traction power supply system further comprises: the three button switches respectively control the power supply, the grounding and the isolation operation of the isolating switch, generate corresponding power supply control signals, isolation control signals and grounding control signals and send the power supply control signals, the isolation control signals and the grounding control signals to the control protection device; when the control protection device receives a power supply control signal, the third contactor is controlled 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 indication signal to drive the three-position switch to be opened from the power supply position or the sixth contactor is controlled by combining the received grounding indication signal to drive the three-position switch to be opened from the grounding position; and when receiving the grounding control signal, controlling the fifth contactor to drive the three-position switch to be switched on.
The beneficial effects of the invention are as follows:
According to the direct-current traction power supply system, the residual voltage absorbing device is additionally arranged, so that when the excessive residual voltage of the contact net is detected before the line test, the residual voltage can be absorbed first, and when the normal voltage value is reached, the line test is allowed; before the isolating switch is grounded, in order to avoid personnel injury caused by residual voltage, residual voltage absorption can be performed to reduce residual voltage first until the safe voltage is reached, and then the isolating switch is grounded. In addition, by utilizing the isolating switch to replace manual operation, the potential safety hazard is reduced.
Drawings
Fig. 1 is a schematic diagram of residual pressure absorbing principle of examples 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 of 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 used for inhibiting elements and absorbing residual voltage of the contact net;
k1: the first contactor contact switch is used for conducting a residual voltage absorption loop;
QF: the quick breaker is used for supplying power to the track traffic contact net;
f1: is a high voltage fuse for preventing line measurement loop overcurrent faults;
K2: a second contactor contact switch for conducting the voltage measurement loop;
R2: the circuit test resistor is used for measuring the current limit of the circuit; 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 voltage measuring amplifier is used for measuring feeder voltage Uf;
U3: the overhead line system voltage measuring amplifier is used for measuring overhead line system voltage Uc;
q1: the control switch K1 is controlled by the control protection device to be turned off for the first contactor coil;
Q2: the second contactor coil is controlled by a control protection device, and the control switch K2 is turned off;
q3: the third contactor coil is controlled by a control protection device, and the control switch K3 is turned off;
q4: the control switch K4 is turned off for the fourth contactor coil and is controlled by the control protection device;
q5: for the fifth contactor coil, the control switch K5 is turned off under the control of the control protection device;
q6: for the sixth contactor coil, the control switch K6 is turned off under the control of the control protection device;
K3: the third contactor contact switch is used for conducting a forward loop of the motor to drive the isolating switch to be switched on, at the moment, the isolating switch is positioned at a power supply position (the moving contact of the isolating switch is positioned at a '1' position), and bus voltage supplies power to the contact net through QF and the isolating switch, namely a power supply line is conducted;
And K4: the contact switch is a fourth contactor contact switch, is used for conducting a reverse loop of a motor and driving the isolating switch to be opened, and is positioned at an isolating position (the moving contact of the isolating switch is positioned at a 0 position) at the moment, and the contact network is isolated from a power supply line and a ground line at the moment;
And K5: the fifth contactor contact switch is used for conducting a reverse loop of the motor to drive the isolating switch to be switched on, at the moment, the isolating switch is in a grounding position (the moving contact of the isolating switch is in a 2 position), and the contact net is conducted with the return rail through the grounding wire, namely the grounding wire is conducted;
k6: the contact switch is a sixth contactor contact switch, is used for conducting a forward loop of the motor and driving the isolating switch to be opened, and is positioned at an isolating position (a moving contact of the isolating switch is positioned at a 0 position) at the moment, and the contact network is isolated from a power supply line and a grounding line at the moment;
e1: the switch-on power supply of the isolating switch is controlled for the push button switch;
e2: the switch-on power supply of the isolating switch is controlled to be grounded for the push button switch;
E3: the switch is a button switch, and the isolating switch is controlled to be separated;
k3-1, K3-2, K3-3: an auxiliary contact of the contact switch K3;
K4-1, K4-2, K4-3: an auxiliary contact of the contact switch K4;
K5-1, K5-2, K5-3: an auxiliary contact of the contact switch K5;
k6-1, K6-2, K6-3: 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 the contact net (rail) and the walking rail, and can safely ground the contact net during equipment overhaul.
QS is: the two-station isolating switch can realize two functions of power supply and isolation, and can form a direct current 750V/1500V loop between the contact net (rail) and the walking rail.
QS1-1a, QS1-1b, QS1-2: isolating switch auxiliary contacts. When the isolating switch is switched on (the moving contact moves from the position of 0 to 1), QS1-1b and QS1-2 are changed from normal open to normal closed, QS1-1a is changed from normal closed to normal open, and a pin connected with QS1-2 of the control protection device A0 generates a high-level signal which is a power supply indication signal; when the disconnecting switch is opened (the moving 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, QS2-2: isolating switch auxiliary contacts. When the isolating switch is switched on (the moving contact moves from the position of 0 to 2), QS2-1b and QS2-2 are changed from normal open to normal closed, QS2-1a is changed from normal closed to normal open, and a pin connected with QS2-2 by the control protection device A0 generates a high-level signal which is a grounding indication signal; when the disconnecting switch is disconnected (the moving contact moves from the position of '2' to '0'), the QS2-1a, the QS2-1b and the QS2-2 recover (called reset).
QS0-1: an auxiliary contact of the isolating switch, when the isolating switch is switched on (the moving contact moves from the position of 0 to 1 or the moving contact moves from the position of 0 to 2), QS0-1 is changed from normally closed to normally open; the pin connected with QS0-1 of the control protection device A0 generates a low-level signal, and the isolation indication signal disappears at the moment; when the isolating switch is opened (the moving contact moves from the position of '1' to '0' or the moving contact moves from the position of '2' to '0'), the QS0-1 is restored to the original position (reset), and the pin connected with the control protection device A0 and the QS0-1 generates a high-level signal which is an isolating indication signal.
A0: the control protection device and one of the controllers can receive and process bus voltage signals, feeder voltage signals, contact net voltage signals and grounding, isolating and power supply indication signals of the isolating switch, and can also control the on-off of the contactor.
Detailed Description
The invention is described in further detail below with reference to the examples and with reference to the accompanying drawings.
Example 1:
One embodiment of the 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 is added between the overhead line and the shape-moving rail, a voltage sampling loop of the overhead line is newly added, and the residual voltage of the overhead line is absorbed by using the suppression element and the contactor by depending on the existing control protection device in the feeder line test system.
Before a feeder line test is carried out, the control protection device judges whether residual voltage between the contact net and the running rail exceeds a threshold value or not through the received voltage sampling signal. When the residual voltage exceeds a threshold value, the control protection device controls the contactor to be switched on, the residual voltage absorption loop is conducted, the inhibiting element absorbs the residual voltage, the feeder line test is conducted until the voltage of the contact network reaches the normal voltage, and the feeder circuit breaker is switched on until the line test passes.
When equipment maintenance is needed, before the on-line isolating switch is grounded, the control and protection device judges whether residual voltage exists between the contact network and the running rail or not through the received voltage sampling signal, and whether the residual voltage exceeds a threshold value or not. When the residual voltage exceeds a threshold value, the residual voltage is restrained by the residual voltage absorbing unit, and the isolating switch is controlled to be grounded after the residual voltage reaches the safe voltage.
In the direct current traction power supply system with functions of intelligently eliminating residual voltage and safely grounding the contact net as shown in fig. 2, the working principle is as follows.
Judging and absorbing residual pressure of the contact net:
before line test and before the three-station isolating switch is grounded, judging the residual voltage of the contact net is needed, and absorbing the residual voltage of the contact net when necessary, wherein the three-station isolating switch is in an isolated state. The process is as follows:
the voltage measurement amplifier U3 sends the collected contact net voltage signal to the control protection device, the protection device receives the voltage signal and distinguishes the residual voltage and the normal voltage, if the residual voltage is determined to be the residual voltage (the range is 0V to 1500V different according to working conditions), the contactor coil Q1 is controlled to be electrified, the contactor switch K1 is closed by the Q1, the residual voltage absorption loop is conducted, the residual voltage is absorbed by the inhibition element R1 (the power requirement is more than or equal to 30W, the impedance is more than or equal to 160kΩ and is less than or equal to 240kΩ) until the normal voltage is reached, and the control protection device controls the residual voltage absorption unit to stop residual voltage absorption work.
The circuit testing process comprises the following steps:
Before the direct current quick breaker QF is switched on, after the residual voltage absorbing work is finished, the line test is carried out. The bus voltage measuring amplifier U1 and the feeder voltage measuring amplifier U2 measure a bus voltage U r and a feeder side voltage U f in the direct current traction system; the control protection device A0 acquires a bus voltage U r and a feeder line side voltage U f, and if the bus voltage U r is not smaller than a feeder line minimum working voltage U flow and the feeder line voltage U f is not larger than a set line residual voltage U fresidue, the bus voltage is normal, and a feeder line side line has no voltage; at this time, because the residual voltage is lost, a method for measuring the line resistance can be used for judging whether the line is normal or not. Before the residual voltage absorption unit is added, the method (a method for measuring the line resistance) is influenced by the residual voltage, so that the line test cannot pass and normal power supply is influenced with high probability. The method comprises the following steps: the control and protection device controls the energization of the contactor coil Q2 so that the contactor contact switch K2 is closed, and the bus voltage is applied to the feeder side through F1 and R2, and the device calculates the feeder side loop resistance R re. The calculation method is as follows:
Rre＝R2*Uf/((Ur-Uf)Rcalibration)；
Wherein R calibration is a line calibration resistor and is used for compensating the accuracy error of the line R2, and the value range is 27000-65000 mΩ (milliohm).
If the feeder line side loop resistance R re exceeds the threshold value R min(Rmin and the value range is 300-10000 mΩ), namely R re≥Rmin, the feeder line loop is considered to be fault-free, and the direct current quick breaker can be directly switched on; if the feeder-side loop resistance R re＜Rmin is measured, the control protection device A0 sends out a closing signal for locking the quick breaker QF as a short circuit.
And (3) a contact net safety grounding process:
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 line is in a conducting state and transmits 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 through an indicator lamp) through a display.
2) Power supply and isolation
And (3) power supply:
When the three-station isolating switch QS is required to be switched on for power supply, the button E1 is pressed, the power supply control signal line is conducted, the control protection device A0 receives the power supply control signal, if the three-station isolating switch is judged to be at the isolating position, the contactor coil Q3 is rapidly controlled to be electrified, the contactor switch K3 is enabled to be closed by the Q3, the motor is conducted in a forward loop to drive the isolating switch to be switched on, the isolating switch is at the power supply position (1 position) at the moment, the bus voltage is used for supplying power to the contact network through the QF and the isolating switch, and the power supply line is normally conducted for power supply.
When the coil Q3 is electrified, the auxiliary contact K3-3 is closed, and the loop is kept on.
When the coil Q3 is electrified, the auxiliary contact K3-1 is opened, the Q4 is guaranteed to be in an open circuit state, and the situation that the contact net is isolated from the power supply line and the grounding line due to misoperation (such as mistakenly pressing an isolating button or controlling a protection device to send a signal mistakenly) is avoided, so that the influence is brought to the closing power supply of the isolating switch.
When the coil Q3 is electrified, the auxiliary contact K3-2 is opened, the Q5 is guaranteed to be in an open circuit state, and the situation that the contact network grounding line is triggered to be conducted due to misoperation (such as mistakenly pressing a grounding button or controlling a protection device to send a signal mistakenly) is avoided, so that influence is brought to closing power supply of the isolating switch.
The three-station isolating switch QS is switched on to drive the linkage auxiliary contact QS1-1a to be disconnected, the control loop of the contactor coil Q3 is powered off, at the moment, the contactor coil Q3 is powered off, and the corresponding contactor switch K3 and auxiliary contacts K3-1, K3-2 and K3-3 are reset.
The three-station isolating switch QS is switched on to drive the linkage auxiliary contact QS1-1b to be closed, the control loop of the contactor coil Q4 is switched on, and at the moment, the isolating switch can be controlled to return to the 0 position through E3.
The three-station disconnecting switch QS is switched on to drive the linkage auxiliary contact QS1-2 to be closed, the power supply indication line is conducted to send a power supply indication signal, and the control protection device A0 judges that the disconnecting switch is in a power supply switching-on position through receiving the power supply indication signal and displays the current power supply state (or through an indicator lamp) through a display.
The three-station isolating switch QS is switched on to drive the linkage auxiliary contact QS0-1 to be disconnected, and the isolating indication line is in a power-off state.
Isolation:
When the three-station isolating switch is required to be powered off and isolated, a button E3 is pressed, an isolating control signal line is conducted, a control protection device A0 receives an isolating control signal, if the three-station isolating switch is judged to be in a power supply position at this moment, a contactor coil Q4 is rapidly controlled to be electrified (a coil Q6 is connected with the coil Q4 in parallel and is controlled by the same output point of A0, but the Q6 control line is in an open circuit state at this moment, the Q6 cannot be electrified), the Q4 enables a contactor switch K4 to be closed, a motor is conducted in a reverse loop to drive the isolating switch to be disconnected, the isolating switch is in an isolating position (0) at this moment, and a contact net is isolated from the power supply line and the grounding line.
When the coil Q4 is electrified, the auxiliary contact K4-3 is closed, and the loop is kept on.
When the coil Q4 is electrified, the auxiliary contact K4-1 is opened, the Q3 is guaranteed to be in an open circuit state, and the situation that misoperation (mistakenly pressing a power supply button or controlling a protection device to send a signal mistakenly) triggers the conduction of a power supply line of the contact net is avoided, so that the influence is brought to the separation of the disconnecting switch.
When the coil Q4 is electrified, the auxiliary contact K4-2 is opened, the Q6 is in an open circuit state, inconsistent movement directions between the K6 and the K4 are avoided, misoperation (missignaling of the control protection device) is avoided, and accordingly influence is brought to the separation of the isolating switch.
The three-station isolating switch QS is separated from the brake to drive the linkage auxiliary contact QS1-1b to be disconnected, the control loop of the contactor coil Q4 is powered off, at the moment, the contactor coil Q4 is powered off, and the corresponding contactor switch K4 and auxiliary contacts K4-1, K4-2 and K4-3 are reset.
The three-station isolating switch QS is driven to be closed by the brake separating belt to drive the auxiliary contact QS1-1a, the control loop of the contactor coil Q3 is switched on, and the isolating switch can be controlled to return to the 1 position through E1.
The three-station isolating switch QS is driven to be closed by the brake separating belt to drive the linkage auxiliary contact QS0-1, the isolating indication line is conducted 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 through an indicator lamp) through a display.
The three-station disconnecting switch QS drives the linkage auxiliary contact QS1-2 to be disconnected, and the power supply indicating line is in a power-off state.
3) Grounding and isolation
And (3) grounding:
When the power is required to be cut off for maintenance operation, the contact net is required to be grounded after the breaker is disconnected, the traditional method of manually hanging the short-circuit line is abandoned, and the three-station disconnecting switch is adopted, so that automatic grounding is realized, and casualties are reduced. Before grounding, the residual voltage absorbing unit is required to absorb residual voltage, so that the problem that the normal power supply is affected due to the tripping of a circuit caused by grounding in an electrified state is avoided. The residual pressure judging and absorbing process is as follows:
The short-circuiting device QF is disconnected, the three-station isolating switch is positioned at an isolating position, the voltage between the contact net and the negative electrode is detected by the voltage measuring amplifier U3, the voltage is received by the control protecting device, and if no voltage or safety voltage is judged, the three-station isolating switch is grounded; if the safety voltage is exceeded, the contactor coil Q1 is controlled to be electrified, the contactor switch K1 is closed by the Q1, the residual voltage absorption loop is conducted, the residual voltage is absorbed by the inhibition element R1 until the safety voltage is reached, the three-station isolating switch is controlled to be grounded, the short-distance manual operation is not needed for grounding during grounding, only the remote control is needed for grounding, and the personal safety is ensured. The grounding process is as follows:
When the three-station isolating switch QS is required to be switched on and grounded, the button E2 is pressed, the grounding control signal line is conducted, the control protection device A0 receives the grounding control signal at the moment, if the three-station isolating switch is judged to be at the isolating position at the moment, the contactor coil Q5 is rapidly controlled to be electrified, the contactor switch K5 is enabled to be closed, the motor is conducted in a reverse loop to drive the isolating switch to be switched on, the isolating switch is at the grounding position ('2' position) at the moment, and the contact net is conducted with the return rail through the grounding wire, namely the grounding wire is conducted.
When the coil Q5 is electrified, the auxiliary contact K5-3 is closed, and the loop is kept on.
When the coil Q5 is electrified, the auxiliary contact K5-1 is opened, the Q3 is guaranteed to be in an open circuit state, and the situation that misoperation (mistakenly pressing a power supply button or controlling a protection device to send a signal mistakenly) triggers the contact net power supply line to conduct is avoided, so that the influence is brought to the closing grounding of the isolating switch.
When the coil Q5 is electrified, the auxiliary contact K5-2 is opened, the Q6 is guaranteed to be in an open circuit state, and the situation that the contact net is isolated from the power supply line and the grounding line by misoperation (by mistakenly pressing an isolating button or controlling a protecting device to send a signal by mistake) is avoided, so that the influence is brought to the closing grounding of the isolating switch.
The three-station isolating switch QS is switched on to drive the linkage auxiliary contact QS2-1a to be disconnected, the control loop of the contactor coil Q5 is powered off, at the moment, the contactor coil Q5 is powered off, and the corresponding contactor switch K5 and auxiliary contacts K5-1, K5-2 and K5-3 are reset.
The three-station isolating switch QS is switched on to drive the linkage auxiliary contact QS2-1b to be closed, the control loop of the contactor coil Q6 is switched on, and at the moment, the isolating switch can be controlled to return to the 0 position through E3.
The three-station disconnecting switch QS is switched on to drive the linkage auxiliary contact QS2-2 to be closed, the grounding indication line is conducted to send a grounding indication signal, and the control protection device A0 judges that the disconnecting switch is in a grounding switch-on position through receiving the grounding indication signal and displays the current grounding state (or through an indicator lamp) through a display.
The three-station isolating switch QS is switched on to drive the linkage auxiliary contact QS0-1 to be disconnected, and the isolating indication line is in a power-off state.
Isolation:
When the three-station isolating switch is required to be powered off and isolated, a button E3 is pressed, an isolating control signal line is conducted, a control protection device A0 receives an isolating control signal, if the three-station isolating switch is judged to be in a grounding position at this moment, a contactor coil Q6 is rapidly controlled to be electrified (the coil Q6 is connected with a coil Q4 in parallel and is controlled by the same output point of A0, but the Q4 control line is in an open circuit state at this moment, the Q4 cannot be electrified), the Q6 enables a contactor switch K6 to be closed, a motor forward loop is conducted to drive the isolating switch to be disconnected, the isolating switch is in an isolating position (0 position at this moment), and a contact net is isolated from a power supply line and a grounding line.
When the coil Q6 is electrified, the auxiliary contact K6-3 is closed, and the loop is kept on.
When the coil Q6 is electrified, the auxiliary contact K6-1 is opened, the Q4 is in an open circuit state, inconsistent movement directions between the K4 and the K6 are avoided, misoperation (missignaling of the control protection device) is avoided, and accordingly influence is brought to the separation of the isolating switch.
When the coil Q6 is electrified, the auxiliary contact K6-2 is opened, the Q5 is guaranteed to be in an open circuit state, and the situation that misoperation (mistakenly pressing a grounding button or controlling a protection device to send a signal mistakenly) triggers the conduction of a grounding line of the contact net is avoided, so that the influence is brought to the separation and isolation of the isolating switch.
The three-station isolating switch QS is separated from the brake to drive the linkage auxiliary contact QS2-1b to be disconnected, the control loop of the contactor coil Q6 is powered off, at the moment, the contactor coil Q6 is powered off, and the corresponding contactor switch K6 and auxiliary contacts K6-1, K6-2 and K6-3 are reset.
The three-station isolating switch QS is driven to be closed by the brake separating belt to drive the auxiliary contact QS2-1a, the control loop of the contactor coil Q5 is switched on, and the isolating switch can be controlled to return to the 2 position through E2.
The three-station isolating switch QS is driven to be closed by the brake separating belt to drive the linkage auxiliary contact QS0-1, the isolating indication line is conducted 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 through an indicator lamp) through a display.
The three-station disconnecting switch QS is used for disconnecting the linkage auxiliary contact QS2-2, and the grounding indication line is in a power-off state.
Example 2:
Another embodiment of the present invention is a dc traction power system that eliminates residual voltage. As shown in fig. 3, the same as embodiment 1 is that a catenary residual voltage absorption loop (comprising a suppression element and a contactor) and a catenary voltage sampling loop are arranged between the catenary and the shape-changing rail, and the catenary residual voltage absorption loop is controlled to realize the absorption of the catenary 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.
Before the line test, the residual voltage of the contact net needs to be judged, and if necessary, the residual voltage of the contact net is absorbed, at this time, the two-station isolating switch is in an isolated state, and the judging and absorbing process of the residual voltage of the contact net is similar to that in the embodiment 1.
The working mode of the two-station disconnecting switch in the direct current traction power supply system with the function of intelligently eliminating residual voltage shown in fig. 3 is 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 line is in a conducting state and transmits 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 through an indicator lamp) through a display.
2) Power supply and isolation
And (3) power supply:
When the two-station isolating switch QS is required to be switched on for power supply, the button E1 is pressed, the power supply control signal line is conducted, the control protection device A0 receives the power supply control signal, if the isolating switch is judged to be at the isolating position, the contactor coil Q3 is rapidly controlled to be electrified, the contactor switch K3 is enabled to be closed by the Q3, the motor is conducted in a forward loop to drive the isolating switch to be switched on, the isolating switch is at the power supply position (1 position) at the moment, and the power supply line is normally conducted for power supply.
When the coil Q3 is electrified, the auxiliary contact K3-2 is closed, and the loop is kept on.
When the coil Q3 is electrified, the auxiliary contact K3-1 is opened, the Q4 is guaranteed to be in an open circuit state, and the situation that the contact net is isolated from the power supply line due to misoperation (the isolating button is pressed by mistake or the control protection device sends a signal by mistake) is avoided, so that the influence is brought to the closing power supply of the isolating switch.
The two-station isolating switch QS is switched on to drive the linkage auxiliary contact QS1-1a to be disconnected, the control loop of the contactor coil Q3 is powered off, at the moment, the contactor coil Q3 is powered off, and the corresponding contactor switch K3 and auxiliary contacts K3-1 and K3-2 are reset.
The two-station isolating switch QS is switched on to drive the linkage auxiliary contact QS1-1b to be closed, the control loop of the contactor coil Q4 is switched on, and at the moment, the isolating switch can be controlled to return to the 0 position through E2.
The two-station disconnecting switch QS is switched on to drive the linkage auxiliary contact QS1-2 to be closed, the power supply indication line is conducted to send a power supply indication signal, and the control protection device A0 judges that the disconnecting switch is in a power supply switching-on position through receiving the power supply indication signal and displays the current power supply state (or through an indicator lamp) through a display.
The two-station isolating switch QS is switched on to drive the linkage auxiliary contact QS0-1 to be disconnected, and the isolating indication line is in a power-off state.
Isolation:
When the two-station isolating switch is required to be powered off and isolated, the button E2 is pressed, the isolating control signal line is conducted, at the moment, the control protection device A0 receives the isolating control signal, the contactor coil Q4 is rapidly controlled to be electrified, the contactor switch K4 is closed by the Q4, the motor is conducted in a reverse loop, the isolating switch is driven to be disconnected, at the moment, the isolating switch is located at an isolating position (0 position), and the contact net is isolated from the power supply line.
When the coil Q4 is electrified, the auxiliary contact K4-2 is closed, and the loop is kept on.
When the coil Q4 is electrified, the auxiliary contact K4-1 is opened, the Q3 is guaranteed to be in an open circuit state, and the situation that misoperation (mistakenly pressing a power supply button or controlling a protection device to send a signal mistakenly) triggers the conduction of a power supply line of the contact net is avoided, so that the influence is brought to the separation of the disconnecting switch.
The two-station isolating switch QS is separated from the brake to drive the linkage auxiliary contact QS1-1b to be disconnected, the control loop of the contactor coil Q4 is powered off, at the moment, the contactor coil Q4 is powered off, and the corresponding contactor switch K4 and the auxiliary contacts K4-1 and K4-2 are reset.
The two-station isolating switch QS is driven to be closed by the brake separating belt to drive the auxiliary contact QS1-1a, the control loop of the contactor coil Q3 is switched on, and the isolating switch can be controlled to return to the 1 position through E1.
The two-station isolating switch QS is driven to be closed by the brake separating belt to drive the linkage auxiliary contact QS0-1, the isolating indication line is conducted 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 through an indicator lamp) through a display.
The two-station disconnecting switch QS drives the linkage auxiliary contact QS1-2 to be disconnected, and the power supply indicating line is in a power-off state.
While the application has been disclosed in terms of preferred embodiments, the embodiments are not intended to limit the application. Any equivalent changes or modifications can be made without departing from the spirit and scope of the present application, and are intended to be within the scope of the present application. The scope of the application should therefore be determined by the following claims.
Claims (7)
1. The utility model provides a eliminate direct current traction power supply system of residual voltage, sets up between power supply busbar and walking rail, its characterized in that includes:
The voltage detection loop comprises a contact network voltage detection module positioned between the contact network and the running rail, and the voltage detection module detects the voltage between the contact network and the running rail and sends the voltage to the control protection device;
the residual voltage absorption loop of the contact net is respectively connected with the contact net and the shape-changing rail, and absorbs residual voltage of the contact net when in operation;
the isolating switch is respectively connected with the bus and the contact net, and responds to the instruction of the control protection device to supply power to the contact net or isolate the contact net from the bus;
The control protection device acquires the voltage between the contact net and the running rail through the voltage detection loop, and when the voltage exceeds a specified threshold value, the residual voltage absorption loop of the contact net is controlled to work until the normal value is reached;
The overhead contact system residual voltage absorption loop comprises a suppression element and a first contactor which are connected in series between the overhead contact system and the running rail; in response to a residual voltage absorption instruction of the control protection device, the first contactor is switched on, the residual voltage absorption loop of the contact net is conducted, and the inhibiting element absorbs residual voltage between the contact net and the running rail.
2. The direct current traction power supply system for eliminating residual voltage according to claim 1, further comprising a feeder line side line test triggering device connected in parallel to a quick breaker for supplying power to the overhead line, the feeder line side line test being triggered in response to a feeder line 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 running rail and a feeder side voltage detection module positioned between the feeder and the running rail, and the voltages of the bus side and the feeder side are respectively detected and sent to the control protection device;
the control protection device acquires bus side voltage and feeder side voltage through the voltage detection loop and judges whether the bus voltage is normal or not and the feeder side line has no voltage; if yes, the control protection device sends a feeder line side line testing instruction to the feeder line side line testing triggering device.
3. The residual voltage removal direct current traction power supply system according to claim 2, wherein the feeder line side line test triggering device comprises a second contactor, a high voltage fuse and a line test resistor connected in series, and the protection device controls the second contactor coil to be electrified and the second contactor contact switch to be closed when the feeder line test is required.
4. The DC traction power supply system for eliminating residual voltage according to any one of claims 1-3, further comprising a power supply indication circuit and an isolation indication circuit, wherein the isolation switch is a two-station switch, one end of the isolation switch is connected with the contact net, the other end of the isolation switch is connected with the feeder line side,
The third contactor drives the two-station switch to be switched on, at the moment, the two-station isolating switch is positioned at a power supply position, and the power supply indication circuit sends a power supply indication signal to the control protection device;
The fourth contactor drives the two-station switch to be opened from the power supply position, and the isolation indication circuit sends an isolation indication signal to the control protection device after the opening is completed.
5. The residual voltage removal direct current traction power supply system according to claim 4, further comprising:
the two button switches respectively control the power supply and isolation operation of the isolating switch, generate corresponding power supply control signals and isolation control signals and send the power supply control signals and the isolation control signals to the control protection device;
when the control protection device receives a power supply control signal, the third contactor is controlled to drive the two-station switch to be switched on; when the isolation control signal is received, the fourth contactor is controlled to drive the two-station switch to be opened from the power supply position.
6. The direct current traction power supply system for eliminating residual voltage according to any one of claims 1 to 3, further comprising a power supply indication circuit, a grounding indication circuit and an isolation indication circuit, wherein the isolation switch is a three-position switch, and is used for supplying power to the overhead contact system, isolating or grounding the overhead contact system from the bus in response to an instruction of the control protection device, the first terminal is connected with the overhead contact system, the second terminal is connected with the feeder side, and the third terminal is grounded;
The third contactor drives the three-position switch to be switched on, at the moment, the three-position isolating switch is positioned at a power supply position, and the power supply indication circuit sends a power supply indication signal to the control protection device;
The fifth contactor drives the three-position switch to be switched on, at the moment, the three-position isolating switch is positioned at a grounding position, and the grounding indication circuit sends a grounding indication signal to the control protection device;
The third station switch is driven by the fourth contactor to be opened from the power supply position, and the isolation indication circuit sends an isolation indication signal to the control protection device after the opening is completed;
the third station switch is driven by the sixth contactor to be opened by the grounding position, and the isolation indication circuit sends an isolation indication signal to the control protection device after the opening is completed.
7. The residual voltage removal direct current traction power supply system according to claim 6, further comprising:
The three button switches respectively control the power supply, the grounding and the isolation operation of the isolating switch, generate corresponding power supply control signals, isolation control signals and grounding control signals and send the power supply control signals, the isolation control signals and the grounding control signals to the control protection device;
When the control protection device receives a power supply control signal, the third contactor is controlled 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 indication signal to drive the three-position switch to be opened from the power supply position or the sixth contactor is controlled by combining the received grounding indication signal to drive the three-position switch to be opened from the grounding position; and when receiving the grounding control signal, controlling the fifth contactor to drive the three-position switch to be switched on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910710150.4A CN110380399B (en) | 2019-08-02 | 2019-08-02 | DC traction power supply system for eliminating residual voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910710150.4A CN110380399B (en) | 2019-08-02 | 2019-08-02 | DC traction power supply system for eliminating residual voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110380399A CN110380399A (en) | 2019-10-25 |
| CN110380399B true CN110380399B (en) | 2024-05-07 |
Family
ID=68257674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910710150.4A Active CN110380399B (en) | 2019-08-02 | 2019-08-02 | DC traction power supply system for eliminating residual voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110380399B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115912285A (en) * | 2022-10-15 | 2023-04-04 | 成都工百利自动化设备有限公司 | Anti-reverse power transmission safety isolation device used between power distribution network line and test instrument |
| CN117155145B (en) * | 2023-08-30 | 2024-10-11 | 广州泰达创盈电气有限公司 | Discharge device and discharge system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6407897B1 (en) * | 2000-03-31 | 2002-06-18 | Eaton Corporation | Network protector with diagnostics |
| CN2679915Y (en) * | 2004-01-16 | 2005-02-16 | 苏州市苏开电气成套公司 | Touch-screen program controlled synchrous dynamo exciter |
| RU55221U1 (en) * | 2005-08-25 | 2006-07-27 | Государственное образовательное учреждение высшего профессионального образования Московский государственный университет путей сообщения (МИИТ) | DC POWER SUPPLY DEVICE FOR DC ELECTRIC RAILWAY |
| CN101524966A (en) * | 2008-03-03 | 2009-09-09 | 株洲南车时代电气股份有限公司 | Electrical locomotive overvoltage suppression absorbing system and electrical locomotive overvoltage suppression absorbing device |
| CN101794986A (en) * | 2010-03-12 | 2010-08-04 | 镇江大全赛雪龙牵引电气有限公司 | Line test device and test method of direct-current traction power supply switch cabinet |
| RU2397502C1 (en) * | 2009-04-29 | 2010-08-20 | Государственное Образовательное Учреждение Высшего Профессионального Образования "Московский Государственный Университет Путей Сообщения" | Control device of transient and sustained short circuit in alternating current contact network |
| CN102496913A (en) * | 2011-12-14 | 2012-06-13 | 镇江大全赛雪龙牵引电气有限公司 | Circuit test system and circuit test and protection method for direct-current traction power supply feeder unit |
| CN103950394A (en) * | 2014-03-25 | 2014-07-30 | 株洲变流技术国家工程研究中心有限公司 | Alternating current and direct current mixed traction power supply system with ice melting function |
| CN108649551A (en) * | 2018-06-13 | 2018-10-12 | 中铁第四勘察设计院集团有限公司 | Rail traffic online tri-station isolating switch and monitoring system |
| CN210111605U (en) * | 2019-08-02 | 2020-02-21 | 镇江大全赛雪龙牵引电气有限公司 | DC traction power supply system for eliminating residual voltage |
-
2019
- 2019-08-02 CN CN201910710150.4A patent/CN110380399B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6407897B1 (en) * | 2000-03-31 | 2002-06-18 | Eaton Corporation | Network protector with diagnostics |
| CN2679915Y (en) * | 2004-01-16 | 2005-02-16 | 苏州市苏开电气成套公司 | Touch-screen program controlled synchrous dynamo exciter |
| RU55221U1 (en) * | 2005-08-25 | 2006-07-27 | Государственное образовательное учреждение высшего профессионального образования Московский государственный университет путей сообщения (МИИТ) | DC POWER SUPPLY DEVICE FOR DC ELECTRIC RAILWAY |
| CN101524966A (en) * | 2008-03-03 | 2009-09-09 | 株洲南车时代电气股份有限公司 | Electrical locomotive overvoltage suppression absorbing system and electrical locomotive overvoltage suppression absorbing device |
| RU2397502C1 (en) * | 2009-04-29 | 2010-08-20 | Государственное Образовательное Учреждение Высшего Профессионального Образования "Московский Государственный Университет Путей Сообщения" | Control device of transient and sustained short circuit in alternating current contact network |
| CN101794986A (en) * | 2010-03-12 | 2010-08-04 | 镇江大全赛雪龙牵引电气有限公司 | Line test device and test method of direct-current traction power supply switch cabinet |
| CN102496913A (en) * | 2011-12-14 | 2012-06-13 | 镇江大全赛雪龙牵引电气有限公司 | Circuit test system and circuit test and protection method for direct-current traction power supply feeder unit |
| CN103950394A (en) * | 2014-03-25 | 2014-07-30 | 株洲变流技术国家工程研究中心有限公司 | Alternating current and direct current mixed traction power supply system with ice melting function |
| CN108649551A (en) * | 2018-06-13 | 2018-10-12 | 中铁第四勘察设计院集团有限公司 | Rail traffic online tri-station isolating switch and monitoring system |
| CN210111605U (en) * | 2019-08-02 | 2020-02-21 | 镇江大全赛雪龙牵引电气有限公司 | DC traction power supply system for eliminating residual voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110380399A (en) | 2019-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109789810B (en) | Automatic neutral section passing system of electrified railway section station and control method thereof | |
| CN103618377B (en) | For being connected to backup auto-activating device system and the spare power automatic switching method of small power supply | |
| CN103560479B (en) | A kind of loaded line failure detector circuit being applied to chopper reclosing and method | |
| CA2966600C (en) | Dc circuit breaker and disconnector | |
| CN110380399B (en) | DC traction power supply system for eliminating residual voltage | |
| AU2018372887B2 (en) | Multi-source power supply circuit detection method, system, and device | |
| CN109444633B (en) | Rubber-tyred rail vehicle station-entering grounding safety monitoring system | |
| US20240336144A1 (en) | Electrically driven motor vehicle and method for operation thereof | |
| CN110920470B (en) | Electric traction locomotive operation overvoltage suppression control system and method | |
| CN103941180A (en) | High-voltage line breaker condition monitoring system | |
| CN109617021B (en) | Grounding detection protection method for traction converter of railway vehicle | |
| CN104029599B (en) | Railcar pantograph infrabar is fast prompt drop bow fender guard automatically | |
| CN210111605U (en) | DC traction power supply system for eliminating residual voltage | |
| CN106026389A (en) | Opening or closing coil control circuit of circuit breaker and monitoring and protection circuit of opening or closing coil control circuit | |
| CN203543694U (en) | High voltage power distribution control device | |
| CN113479220B (en) | Platform door insulation monitoring and automatic rail connecting control device and control method | |
| CN105897082A (en) | Chassis/earthing switch control circuit of medium-voltage switch cabinet | |
| US20010003500A1 (en) | Electrical protection relay | |
| CN103997020B (en) | One kind hands over straight electric locomotive protector for three-phase motor | |
| CN219039234U (en) | Low-voltage residual current action test trip device | |
| CN215263944U (en) | Automatic switcher for power polarity detection | |
| CN203607923U (en) | Emergency distribution system with insulation on-line monitoring function | |
| CN114019414B (en) | Locomotive direct current 110V control circuit grounding detection circuit | |
| CN118367528B (en) | IGBT or IGBT when high current is short-circuited MOSFET protection method and device | |
| CN112615357B (en) | Power supply protection matching method and device for urban rail power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |