SU1453512A1 - Apparatus for protecting serially connected traction motors with converter of rail electric vehicles in emergency situations - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for protecting traction motors of electric rolling stock during regenerative or rheostatic braking. The purpose of the invention is to increase the speed and increase the reliability of the protection of traction engines. When an emergency current appears in the circuits of korea 13 and 14t engines, their excitation windings 15 and 16 are disconnected by a high-speed switch 11 from the positive pole of the converter 17. In the damping RC chain 5 and 6, a signal appears through the current autotransformer 7 and the zener diode 9 enters the control terminal of the thyristor 2 and opens it. With this, the current through the first capacitor 1 flows first in the forward direction through the T1fistor 2, and then in the opposite direction, through the first diode 3 and locks the thyristor 2. Thus, the magnetization reversal of the cores of the main poles and the reduction of the EMF of the traction motors is ensured. The reopening of the thyristor 2 does not occur, since Zener diode 9 has a stabilization voltage higher than a repeated signal on the third resistor 8. 2 Il. - S S (L j | SL 00 CL FIG.

Description

The invention relates to electrical engineering, in particular, to devices for the protection of traction motors of electric rolling stock during regenerative-1 or throttle

The purpose of the invention is to increase the speed and increase the reliability of the protection of traction engines.

Fig, 1 shows the principal Q device scheme; FIG. 2 shows the time diagrams of the current through the windings of the motor and the traction motors and the voltage on the elements of the device.

The device contains the first capacitor 1, the thyristor 2 and the first diode I, interconnected by the counter-first first resistor 4, the damper of the CS circuit, which includes the second resistor 5 and the second capacitor 20 |, the current autotransformer 7, the secondary winding of which is bridged by the third resistor 8 and connected via the Zener diode to the control output of the specified thyristor, the second 25 diode 10 connected in parallel to the control transition of the thyristor and the opposite conductivity of the control current Zystr The acting key t1, the input of the up-jQ pressure of which is connected to the output | of the sensor 12 of the current connected in the circuit | Korean traction motors 13 and 14. I The device is connected to the windings of the ll-5 and 16 excitation of the traction motor of the thyristor 2 at high speed in the damping RC-chain, a current pulse appears, which through the current autotransformer 7 enters the thyristor control junction circuit 2 and causes unlocking the latter. In this case, the first capacitor 1 shunts the windings 15 and 16 of the excitation

Due to this, the current ig in their circuit begins to decrease according to the cosine-distal law, charging the first capacitor 1 o

At time t. the current ig through the excitation windings 15 and 16 and the valves 2 and 3 changes direction and begins to flow through the second diode 3. From this point on, the thyristor 2 closes and the current ig flows in the opposite direction to quickly re-magnetize the cores of the main poles and reduce the EMF of the traction motors ,

At time t, the current i through the excitation windings 15 and 16 and the first diode 3 is again set to zero. However, at this point in time, the thyristor 2 is in the locked state and the voltages are restored at the gates 2 and 3 and the damping chain. The current pulse amplitude through the RC circuit when the voltage at the gates is less than at the moment when the switch is turned off. In this case, the voltage amplitude on the third resistor

drink, which through a high-speed 8 has a value, the lower voltage of the key 11 is connected to the output terminals - stabilization of the Zener diode 9, Benefit

switch 11 is connected to the output terminals of the converter:; 17 and through the thyris- iTop 2 and the first diode 3 with the first capacitor 1 o

The device works as follows

: In the initial state, the excitation windings 15 and 16 are powered through converter 17 and the traction motors operate in independent excitation mode. Thyristor 2 is locked and thanks to this nepBbrii capacitor

I is disconnected from the windings of the main poles and discharged through the first resistor

with

In the event of the occurrence of an emergency current through the cords of motors 13 and 14, a signal appears at the output of current sensor 12, which enters the control input of key 11, and the latter turns off, At time t, when the key is turned off

I thank for changing the voltage

40

45

50

55

stabilization of the zener diode 9. Due to this, the possibility of re-unlocking the thyristor 2 and magnetizing the cores of the main poles in the forward direction is eliminated.

The flow of a current pulse through the excitation windings of the traction motors in the opposite direction creates an impulse of intensity of the external field of sinusoidal form, the vector of which is directed opposite to the vector of induction of the residual magnetic field

Claims (1)

Thus, the device allows the flow of current through the excitation windings of the reverse direction and, therefore, the rapid extinguishing of the field of the main poles in the emergency mode. A device for protecting series-connected traction motors with an electric subdirector of thyristor 2 at high speed in the damping RC-chain impulses a current pulse, which through the current autotransformer 7 enters the thyristor control transition circuit 2 and causes the latter to unlock. In this case, the first capacitor 1 shunts the windings 15 and 16 of the excitation Due to this, the current ig in their circuit begins to decrease according to the cosine-distal law, charging the first capacitor 1 o At time t. the current ig through the excitation windings 15 and 16 and the valves 2 and 3 changes direction and begins to flow through the second diode 3. From this point on, the thyristor 2 closes and the current ig flows in the opposite direction to quickly re-magnetize the cores of the main poles and reduce the EMF of the traction motors , At time t, the current i through the excitation windings 15 and 16 and the first diode 3 is again set to zero. However, at this point in time, the thyristor 2 is in the locked state and the voltages are restored at the gates 2 and 3 and the damping circuit. The amplitude of the current pulse through the RC circuit during voltage recovery on the valves is less than at the moment when the switch 11 o is turned off. At the same time, the voltage amplitude on the third resistor 8 has a value less than the voltage stabilizing the Zener diode 9, Benefit 8 has a value less than the voltage stabilizing the Zener diode 9, Benefit stabilization of the zener diode 9. Due to this, the possibility of re-unlocking the thyristor 2 and magnetizing the cores of the main poles in the forward direction is eliminated. The flow of a current pulse through the excitation windings of the traction motors in the opposite direction creates an impulse of intensity of the external field of sinusoidal form, the vector of which is directed opposite to the vector of induction of the residual magnetic field Thus, the device allows the flow of current through the excitation windings of the reverse direction and, therefore, the rapid extinguishing of the field of the main poles in the emergency mode. Device for protecting series-connected traction motors with an electric rolling stock converter in emergency mode, containing a high-speed switch connected by the first lead to a terminal for connection to the positive pole of the drive, and a second VBR water to the terminal for connecting to the drive windings of the drive motors and its control input is connected to the output of the motor current sensor, characterized in that, in order to increase speed and increase the reliability of protection, a zener diode is introduced, The source, diode, two capacitors and three resistors, while the cathode of the thyristor is connected. In parallel with the first diode, it is connected to the second output of the high-speed switch, the thyristor anode connected to the first output of the first capacitor, in parallel with which the first resistor is connected and through the second resistor, the second capacitor is connected to the first output of the current autotransformer, which is bridged by the third resistor, the secondary winding of which is connected by a counter-connected zener diode connected to the second by a second resistor the diode, the common output of the current autotransformer is connected to the thyristor cathode, the second the output of the first capacitor is connected to the second terminal for connection to the excitation windings of the traction motors and the negative pole of the converter. FIG. g