CN112366673A - Operation overvoltage suppression circuit and method for steel rail potential limiting device - Google Patents
Operation overvoltage suppression circuit and method for steel rail potential limiting device Download PDFInfo
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- CN112366673A CN112366673A CN202011405562.6A CN202011405562A CN112366673A CN 112366673 A CN112366673 A CN 112366673A CN 202011405562 A CN202011405562 A CN 202011405562A CN 112366673 A CN112366673 A CN 112366673A
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- 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
- H02H9/043—Protection of over-voltage protection device by short-circuiting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/02—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power with means for maintaining voltage within a predetermined range
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Abstract
The invention discloses an operation overvoltage suppression circuit and method of a steel rail potential limiting device, wherein the suppression circuit is formed by connecting an energy-absorbing resistor and a bypass contactor in series and is connected in parallel at two ends of a main circuit fracture of a main contactor of the steel rail potential limiting device in the conventional urban rail transit traction power supply system or is bridged between a traveling steel rail and a ground screen in the conventional urban rail transit traction power supply system. The suppression method mainly utilizes a control strategy that a main contactor of the steel rail potential limiting device is closed first and then separated, and a bypass contactor is closed later and then separated, so that the purposes that the main contactor bears closing impact current and the bypass contactor cuts off and buffers branch current to limit operation overvoltage are achieved. The invention has the advantages that: the safety is not sacrificed while the operation overvoltage of the steel rail potential limiting device is stably and effectively inhibited, and the safe physical isolation fracture of the steel rail and the ground screen is reserved.
Description
Technical Field
The invention relates to the field of rail potential limitation of rail transit, in particular to an operation overvoltage suppression circuit and method of a rail potential limiting device.
Background
In the conventional urban rail transit traction power supply system, as shown in fig. 2, a general current flows into a contact network or a current receiving rail 2 from a power supply 1 of a subway direct current traction power supply system, then flows into a train internal traction power supply system through a train current collector or a pantograph (not shown in the figure), and finally flows back into the power supply 1 of the subway direct current traction power supply system through a train running steel rail 4; because the traveling steel rail 4 has parasitic capacitance and transition resistance to the ground and has larger internal resistance and inductance per se, and the ground potential of the traveling steel rail 4 is increased along with the increase of current flowing in the traveling steel rail 4, in order to ensure the operation safety of the urban rail transit traction power supply system and the life safety of workers and passengers, a steel rail potential limiting device 6 (hereinafter referred to as OVPD) is required to be arranged between the train traveling steel rail 4 and a ground grid 5 of a subway line station substation, a parking lot and a vehicle overhaul section. When the subway vehicle normally operates, the OVPD is in an open state (namely, the steel rail and the ground grid are in an open state), and when the potential of the steel rail exceeds a set protection action value, the OVPD closes (namely, the train running steel rail and the ground grid are connected), and the potential of the steel rail is instantaneously reduced.
At present, the voltage protection of OVPD generally adopts three sections, namely section I (U >) is: when the rail ground voltage reaches a protection threshold voltage U1, after a delay time T1, the OVPD performs protection action, a main contactor K1 in the OVPD is closed, wherein U1 generally has three value conditions of 60V/90V/120V according to different application scenes; section II (U >) is: when the rail ground voltage reaches a protection threshold voltage U2, the OVPD directly performs protection action without time delay, and a main contactor K1 in the OVPD is closed, wherein U2 generally takes 150V; paragraph III (U >) is: when the rail ground voltage reaches the protection threshold voltage U3, the thyristor VT in the OVPD is quickly conducted to pull down the rail ground voltage, and the main contactor K1 is closed, wherein U3 generally takes the value of 600V.
When the OVPD is in operation and resets after the I section acts, the main contactor K1 is subjected to load breaking, when the operating overvoltage generated by breaking is greater than the II section protection threshold voltage U2, the II section protection action of an adjacent station is triggered, the problems occur very frequently in the existing subway operation, the operation difficulty and the workload are greatly increased, and meanwhile, the leakage of stray current is increased.
Disclosure of Invention
The invention aims to provide a circuit and a method for suppressing the operation overvoltage of a steel rail potential limiting device, which are used for overcoming the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
when the circuit is used, the resistance type buffering branch circuit is connected in parallel with two ends of a main circuit fracture of a main contactor of the steel rail potential limiting device in the conventional urban rail transit traction power supply system or is bridged between a traveling steel rail and a ground grid in the conventional urban rail transit traction power supply system.
In the above technical solution, the bypass contactor includes a bypass contactor main contact and a bypass contactor coil; when the energy-absorbing device is used, a main contact of a bypass contactor of the bypass contactor is connected with the energy-absorbing resistor in series and then connected to two ends of a fracture of a main circuit of a main contactor of the steel rail potential limiting device in parallel or bridged between a traveling steel rail and a ground grid in the conventional urban rail transit traction power supply system, and a coil of the bypass contactor is connected with an auxiliary contact of the main contactor in series and then connected to two ends of a coil of the main contactor and two ends of a closing switch in parallel.
In the technical scheme, the resistance value of the energy-absorbing resistor is 0.5-10 omega.
In the above technical scheme, the bypass contactor is a direct current contactor.
An operation overvoltage suppression method for a steel rail potential limiting device comprises the following steps:
s1, connecting the resistance type buffer branch in parallel at two ends of a main circuit fracture of a main contactor of a steel rail potential limiting device in the existing urban rail transit traction power supply system or in a manner of bridging between a traveling steel rail and a ground grid in the existing urban rail transit traction power supply system, and enabling an auxiliary contact of the main contactor to control a coil of a bypass contactor in the resistance type buffer branch in a linkage manner;
s2, closing a closing switch of a main contactor in a steel rail potential limiting device in the existing urban rail transit traction power supply system, enabling a coil of the main contactor to be electrified, enabling a main loop of the main contactor to start to act, enabling an auxiliary contact of the main contactor to be closed after t1 time, enabling a coil of a bypass contactor in a resistance type buffering branch circuit to be electrified, then enabling the main loop of the main contactor to be preferentially conducted and bear system closing impact current after t2 time, then enabling the main contact of the bypass contactor to be conducted after t3 time, establishing a resistance type buffering branch circuit, and creating a prerequisite for implementation of a brake separating buffering process;
s3, when the rail potential limiting device in the existing urban rail transit traction power supply system needs to execute protection action, a closing switch of a main contactor of the rail potential limiting device is disconnected, a coil of the main contactor is powered off, a main loop of the main contactor starts to act, an auxiliary contact of the main contactor is disconnected after t4 time, a coil of a bypass contactor in a resistance type buffering branch circuit is powered off, then the main loop of the main contactor is preferentially separated from a static contact after t5 time, electric arcs are generated, the current of the main loop is transferred to the resistance type buffering branch circuit, and then the main contact of the resistance type buffering branch circuit is disconnected after t6 time, so that the main loop of the main contactor is completely disconnected, and a physical isolation fracture is formed.
In the method, the sum of t1 and t2 is the closing time of the main contactor, and the value range is 15 ms-60 ms;
the t2 is the switching time difference between the auxiliary contact and the main contact in the switching-on process of the main contactor, and the value range of the t2 is 5 ms-20 ms;
the sum of the t2 and the t3 is the closing time of the bypass contactor, wherein the value of t3 is not less than 10 ms.
In the method, the sum of t4 and t5 is the switching-off time of the main contactor, and the value range is 50 ms-80 ms;
the t5 is the switching time difference between the auxiliary contact and the main contact in the opening process of the main contactor, and the value range of the switching time difference is 5 ms-20 ms;
t6 is the time difference between the disconnection of the main contactor and the bypass contactor, and the acquisition range is 10 ms-50 ms.
Compared with the prior art, the invention has the advantages that: 1) the suppression effect is obviously improved, the original 150V-200V overvoltage can be suppressed to 70V-100V, and therefore the II-section protection combined jump of the OVPD of the adjacent station is stably and effectively avoided; 2) compared with the common resistance-capacitance absorption scheme, the safe physical isolation fracture of the steel rail and the ground screen still exists when the method is adopted, so that the safety is not sacrificed while the problem is effectively solved.
Drawings
FIG. 1 is a schematic diagram of an overvoltage suppression circuit for operation of a rail potential limiting device according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of the overvoltage suppression circuit for operation of the rail potential limiting device according to the present invention;
FIG. 3 is a schematic diagram of another embodiment of the overvoltage suppression circuit for operation of the rail potential limiting device of the present invention;
FIG. 4 is a control schematic diagram of the operation of the overvoltage suppression circuit in the first exemplary application;
FIG. 5 is a control schematic diagram of the operation of the overvoltage suppression circuit in the second embodiment;
FIG. 6 is a timing chart showing the control of the operation of the overvoltage suppressing circuit in the first or second embodiment;
description of reference numerals: 1. a power source; 2. a catenary or current rail; 3. an equivalent circuit of a traction power supply system in the train; 4. running the steel rail; 5. a ground net; 6. a rail potential limiting device; 6.1, a main contactor; 6.2, a thyristor; 6.3, an ammeter; 6.4, a voltmeter; 7. a resistive buffer branch; 7.1, an energy-absorbing resistor; 7.2, a bypass contactor;
in fig. 5: 100 is an action time chart of the closing process of the steel rail potential limiting device; 200 is an operation timing chart of the disconnection process of the rail potential limiting device; k1 represents the operation sequence of the main contactor closing switch; k2 represents the auxiliary contact actuation sequence of the main contactor; k3 represents a main contact operation timing of the main contactor; k4 represents the main contact actuation sequence of the bypass contactor.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following description further explains how the invention is implemented by combining the attached drawings and the detailed implementation modes.
Referring to fig. 1, the operating overvoltage suppression circuit for a rail potential limiting device according to the present invention includes a resistor-type snubber branch 7 formed by connecting an energy-absorbing resistor 7.1 and a bypass contactor 7.2 in series; wherein the resistance value of the energy-absorbing resistor 7.1 is 0.5-10 omega; the bypass contactor 7.2 is a dc contactor.
According to actual design requirements, the over-voltage suppression circuit for operation of the steel rail potential limiting device provided by the invention can be connected in parallel at two ends of a main circuit fracture of a main contactor 6.1 of the steel rail potential limiting device 6 in the existing urban rail transit traction power supply system or bridged between a traveling steel rail 4 and a ground grid 5 in the existing urban rail transit traction power supply system when in use, as shown in fig. 2 and 3.
Specifically, in the present invention, the bypass contactor 7.2 comprises a bypass contactor main contact 7.2a and a bypass contactor coil 7.2 b; when the energy-absorbing device is used, a main contact 7.2a of a bypass contactor 7.2 is connected with an energy-absorbing resistor 7.1 in series and then connected to two ends of a main circuit fracture of a main contactor 6.1 of a steel rail potential limiting device 6 in parallel or bridged between a traveling steel rail 4 and a ground grid 5 in the conventional urban rail transit traction power supply system, and a coil 7.2b of the bypass contactor 7.2 is connected with an auxiliary contact 6.1b of the main contactor 6.1 in series and then connected to two ends of a coil 6.1c of the main contactor 6.1 and a closing switch 6.1d of the steel rail potential limiting device 6 in parallel.
Specifically, in the present invention, the rail potential limiting device 6 is a prior art, and the circuit structure thereof can be seen from fig. 2 to 4, and specifically comprises an OVPD main circuit and an OVPD control circuit, wherein the OVPD main circuit specifically comprises a main contact 6.1a of a main contactor 6.1, a thyristor 6.2, an ammeter 6.3 and a voltmeter 6.4; the OVPD control circuit is composed of an auxiliary contact 6.1b of a main contactor 6.1, a coil 6.1c of the main contactor 6.1 and a closing switch 6.1 d;
the main contact point 6.1a of the main contactor 6.1 is connected with the thyristor 6.2 in parallel, the thyristor 6.2 is connected with the ammeter 6.3 in series and is bridged between the walking steel rail 4 and the ground grid 5, and the voltmeter 6.4 is bridged on the walking steel rail 4 and the thyristor 6.2; the coil 6.1c of the main contactor 6.1 is connected in series with the closing switch 6.5, and the auxiliary contact 6.1b of the main contactor 6.1 is connected in parallel with the coil 6.1c of the main contactor 6.1 and the two ends of the closing switch 6.1 d.
Referring to fig. 2 and 4, a first embodiment of the overvoltage suppression circuit for operation of a rail potential limiting device according to the present invention is shown, that is, a resistor-type snubber branch 7 formed by connecting an energy-absorbing resistor 7.1 and a bypass contactor 7.2 in series is connected in parallel to two ends of a break of a main circuit of a main contactor 6.1 of a rail potential limiting device 6 in an existing urban rail transit traction power supply system.
In example 1, the specific circuit connection between the resistive snubber branch 7 and the main contactor 6.1 of the rail potential limiting device 6 is as follows: a coil 7.2b of a bypass contactor 7.2 in the resistance type buffer branch 7 is connected in series with an auxiliary contact 6.1b of a main contactor 6.1 in the steel rail potential limiting device 6 and then connected in parallel with two ends of a coil 6.1c of the main contactor 6.1 and a closing switch 6.1d in the steel rail potential limiting device 6, and a main contact 7.2a of the bypass contactor 7.2 is connected in series with an energy absorption resistor 7.1 and then connected in parallel with two ends of a main contact 6.1a of the main contactor 6.1; the purpose of this design is: the coil 7.2b of the bypass contactor 7.2 in the resistance type buffer branch 7 can be controlled to be switched on or switched off in an interlocking manner through the auxiliary contact 6.1b of the main contactor 6.1, so that the main contact 7.2a of the bypass contactor 7 is also switched on when the main contact 6.1a of the main contactor 6.1 is switched on, and the main contact 7.2a of the bypass contactor 7 is also switched off when the main contact 6.1a of the main contactor is switched off.
In this embodiment 1, when the main circuit of the rail potential limiting device 6 is disconnected, the rail potential limiting device provided by the present invention operates the overvoltage suppressing circuit, which mainly has the following two functions:
the first process is as follows: the current of the OVPD main loop is transferred to a resistance type buffer branch 7 formed by a bypass contactor 7.2 and an energy-absorbing resistor 7.1 from a main contactor 6.1, and the current change rate of the loop is weakened, namely the counter electromotive force of an inductive element of the loop is effectively limited;
and a second process: the energy-absorbing resistor 7.1 can quickly dissipate the energy stored in the equivalent circuit 3 of the traction power supply system in the train and the inductance in the train running steel rail 4, thereby further reducing the current change rate of the bypass contactor 7.2 when the shunt contactor is disconnected, achieving the purpose of limiting the overvoltage operation, and simultaneously, safely and effectively isolating the train running steel rail 4 from the ground screen 5.
Referring to fig. 3 and 5, a second embodiment of the overvoltage suppressing circuit for operation of a rail potential limiting device according to the present invention is shown, in which a resistor-type snubber branch 7 formed by connecting an energy-absorbing resistor 7.1 and a bypass contactor 7.2 in series is bridged between a traveling rail 4 and a ground grid 5 in a conventional traction power supply system for urban rail transit.
In this embodiment 2, the specific circuit connection mode between the resistive buffer branch 7 and the running steel rail 4 and the ground grid 5 is as follows: a coil 7.2b of a bypass contactor 7.2 in the resistance type buffer branch 7 is connected in series with an auxiliary contact 6.1b of a main contactor 6.1 in the steel rail potential limiting device 6 and then connected in parallel with two ends of a coil 6.1c of the main contactor 6.1 and a closing switch 6.1d in the steel rail potential limiting device 6, and a main contact 7.2a of the bypass contactor 7.2 is connected in series with an energy absorption resistor 7.1 and then connected in parallel between a traveling steel rail 4 and a ground screen 5.
The invention provides a method for suppressing the operation overvoltage of a steel rail potential limiting device, which is realized based on the resistance type buffer branch circuit 7 and comprises the following steps:
s1, connecting the resistive buffer branch circuit 7 in parallel to two ends of a main circuit break of a main contactor 6.1 of a rail potential limiting device 6 in the existing urban rail transit traction power supply system or across a gap between a traveling rail 4 and a ground grid 5 in the existing urban rail transit traction power supply system, and making an auxiliary contact of the main contactor 6.1 interlock-control a coil of a bypass contactor 7.2 in the resistive buffer branch circuit 7, as shown in fig. 2 to 5;
s2, closing a closing switch of a main contactor 6.1 of a rail potential limiting device 6 in an existing urban rail transit traction power supply system, so as to electrify a coil of the main contactor 6.1, start a main loop of the main contactor 6.1 to operate, and after t1 time, close an auxiliary contact of the main contactor 6.1, so as to electrify a coil of a bypass contactor 7.2 in a resistive buffer branch 7, then after t2 time, preferentially conduct the main loop of the main contactor 6.1 and carry a system closing impact current, and then after t3 time, conduct a main contact of the bypass contactor 7.2, so as to establish a resistive buffer branch, creating a prerequisite condition for implementing a brake-separating buffer process, as shown in fig. 3 to fig. 6;
s3, when the rail potential limiting device 6 in the conventional urban rail transit traction power supply system needs to perform a protection operation, the closing switch of the main contactor 6.1 is turned off, the coil of the main contactor 6.1 is de-energized, the main loop of the main contactor 6.1 starts to operate, and after t4 time, the auxiliary contact of the main contactor 6.1 is turned off, the coil of the bypass contactor 7.2 in the resistive buffer branch 7 is de-energized, then after t5 time, the main loop of the main contactor 6.1 is preferentially separated from the static contact to generate an arc, and simultaneously the main loop current is transferred to the resistive buffer branch 7, and then after t6 time, the main contact of the resistive buffer branch 7 is disconnected, so that the main loop of the main contactor 6.1 is completely disconnected to form a physical isolation fracture, as shown in fig. 3 to fig. 6;
specifically, in the suppression method, the sum of t1 and t2 is the closing time of the main contactor 6.1, and the value range is preferably 15ms to 60 ms; wherein t2 is the switching time difference between the auxiliary contact and the main contact in the switching-on process of the main contactor 6.1, and the value range is preferably 5 ms-20 ms;
specifically, in the suppression method, the sum of t2 and t3 is the closing time of the bypass contactor 7.2, and in order to ensure stable and reliable preferential contact of the main contactor 6.1, the value of t3 is not less than 10 ms.
Specifically, in the suppression method, the sum of t4 and t5 is the opening time of the main contactor 6.1, and the value range is preferably 50 ms-80 ms; wherein t5 is the switching time difference between the auxiliary contact and the main contact in the opening process of the main contactor 6.1, and the value thereof is basically the same as t2, preferably 5 ms-20 ms.
Specifically, in the suppression method, t6 is the time difference between the disconnection of the main contactor 6.1 and the disconnection of the bypass contactor 7.2, which is the most critical part of the suppression method of the present invention, if the time is too short, the overvoltage suppression effect of the current buffering suppression operation cannot be exerted, and if the time is too long, the power requirement of the energy absorption resistor is increased sharply, which affects the device volume; therefore, from the comprehensive consideration of reliability, economy, safety and the like, the value range of t6 is preferably 10ms to 50ms as proved by a plurality of tests.
Finally, the above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields using the contents of the present specification and the attached drawings are included in the scope of the present invention.
Claims (7)
1. An operating overvoltage suppression circuit for a rail potential limiting device, comprising: the energy-absorbing and energy-saving device comprises a resistance type buffering branch (7) formed by serially connecting an energy-absorbing resistor (7.1) and a bypass contactor (7.2), wherein when the energy-absorbing and energy-saving device is used, the resistance type buffering branch (7) is connected in parallel with two ends of a main circuit fracture of a main contactor (6.1) of a steel rail potential limiting device (6) in the conventional urban rail transit traction power supply system or is bridged between a traveling steel rail (4) and a ground grid (5) in the conventional urban rail transit traction power supply system.
2. The rail potential limiting device operating overvoltage suppression circuit according to claim 1, characterized in that: the bypass contactor (7.2) comprises a bypass contactor main contact (7.2a) and a bypass contactor coil (7.2 b); when the energy-absorbing device is used, a main contact (7.2a) of a bypass contactor of the bypass contactor (7.2) is connected with the energy-absorbing resistor (7.1) in series and then connected to two ends of a main circuit fracture of a main contactor (6.1) of the steel rail potential limiting device (6) in parallel or bridged between a traveling steel rail (4) and a ground grid (5) in the conventional urban rail transit traction power supply system, and a coil (7.2b) of the bypass contactor (7.2) is connected with an auxiliary contact (6.1b) of the main contactor (6.1) in series and then connected to two ends of a coil (6.1c) and a closing switch (6.1d) of the main contactor (6.1) in parallel.
3. The rail potential limiting device operating overvoltage suppression circuit according to claim 2, wherein: the resistance value of the energy-absorbing resistor (7.1) is 0.5-10 omega.
4. The rail potential limiting device operating overvoltage suppression circuit according to claim 2, wherein: the bypass contactor (7.2) is a direct current contactor.
5. An overvoltage suppressing method for operating an overvoltage suppressing circuit based on the rail potential limiting device of claim 1, comprising the steps of:
s1, connecting the resistance type buffer branch (7) in claim 1 in parallel at two ends of a main circuit fracture of a main contactor (6.1) of a steel rail potential limiting device (6) in the existing urban rail transit traction power supply system or in a manner of bridging between a traveling steel rail (4) and a ground grid (5) in the existing urban rail transit traction power supply system, and enabling an auxiliary contact of the main contactor (6.1) to control a coil of a bypass contactor (7.2) in the resistance type buffer branch (7) in an interlocking manner;
s2, closing a closing switch of a main contactor (6.1) in a steel rail potential limiting device (6) in the existing urban rail transit traction power supply system, enabling a coil of the main contactor (6.1) to be electrified, enabling a main loop of the main contactor (6.1) to start to act, enabling an auxiliary contact of the main contactor (6.1) to be closed after t1 time, enabling a coil of a bypass contactor (7.2) in a resistance type buffer branch circuit (7) to be electrified, then after t2 time, enabling the main loop of the main contactor (6.1) to be preferentially conducted and bear system closing impact current, and then after t3 time, enabling a main contact of the bypass contactor (7.2) to be conducted, and enabling the resistance type buffer branch circuit (7) to be connected;
s3, when the rail potential limiting device (6) in the existing urban rail transit traction power supply system needs to execute protection action, a closing switch of a main contactor (6.1) is disconnected, a coil of the main contactor (6.1) is powered off, a main loop of the main contactor (6.1) starts to act, after t4 time, an auxiliary contact of the main contactor (6.1) is disconnected, a coil of a bypass contactor (7.2) in a resistance type buffer branch circuit (7) is powered off, then after t5 time, the main loop of the main contactor (6.1) is preferentially separated from a static contact to generate electric arcs, the current of the main loop is transferred to the resistance type buffer branch circuit (7), and then after t6 time, the main contact of the resistance type buffer branch circuit (7) is disconnected, the main loop of the main contactor (6.1) is completely disconnected, and a physical isolation fracture is formed.
6. The rail potential limiting device operation overvoltage suppressing method according to claim 5, characterized in that: the sum of t1 and t2 is the closing time of the main contactor (6.1), and the value range is 15 ms-60 ms;
the t2 is the switching time difference between an auxiliary contact and a main contact in the switching-on process of the main contactor (6.1), and the value range of the switching time difference is 5 ms-20 ms;
the sum of the t2 and the t3 is the closing time of the bypass contactor (7.2), wherein the value of t3 is not less than 10 ms.
7. The rail potential limiting device operation overvoltage suppressing method according to claim 5, characterized in that: the sum of t4 and t5 is the switching-off time of the main contactor (6.1), and the value range is 50 ms-80 ms;
the t5 is the switching time difference between an auxiliary contact and a main contact in the opening process of the main contactor (6.1), and the value range of the switching time difference is 5 ms-20 ms;
t6 is the time difference between the breaking of the main contactor (6.1) and the breaking of the bypass contactor (7.2), and the acquisition range is 10 ms-50 ms.
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Cited By (2)
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| CN116937525A (en) * | 2023-07-20 | 2023-10-24 | 清华大学 | Rail potential inhibition control method and device for urban rail flexible direct traction power supply system |
| CN117117807A (en) * | 2023-08-29 | 2023-11-24 | 通号（长沙）轨道交通控制技术有限公司 | Rail potential limiting device and switching-on and switching-off control loop and method thereof |
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