JPS60200701A - Protecting method of chopper controller for electric railcar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of protecting a chopper control device for an electric vehicle, which improves reliability.

[Prior art]

A conventional device of this type was the one shown in FIG. In the figure, (1) is a tram line, and (2) is a pantograph.

(3) is a switch for disconnecting the overhead contact line and chopper main circuit, (4J is a fill reactor capacitor, and (4) and (6) constitute an inverted sulter circuit. (6) ) is a backflow blocking diode, (7
) is the switch for turning off the traction motor circuit, (O) is the main smoothing reactor, α0 is the field winding of the traction motor, σρ is the armature winding of the traction motor, QQ and σ
η constitutes a DC series motor, and (2) is a high-speed current reducer. In addition to detecting overcurrent and self-tripping. has a second trip coil source, and this coil σ from the outside]
High-speed tripping is possible by energizing. σ4
is a current reducing resistance, and 9 o'clock is a brake series resistance, which is inserted in series with the armature (11) in a high-speed range to expand the regenerative braking area in a high-speed range. QQ is a switch that turns on when the conditions for shorting the brake series resistance (c) in the medium speed range are met, shorting the play calculated series resistance α, and then turning off the brake or disabling the regenerative brake when the brake is about to stop. Switch A remains on until the main circuit is turned off. α
η is a current detector that detects the current flowing through Choch (7).

(g) is a signal synchronized with the off pulse of chopper (7),
(6) is the commutation failure detector of the chopper (7), and when the signal (g) synchronized with the off pulse comes, the chopper (7)
Even after the time required for commutation of current detector 0η
The presence of the output causes commutation failure of the chopper (7) to be [1], and the high-speed trip coil 0 is energized to turn off the high-speed flow reducer (2). When the high-speed current reducer (2) is turned off, the switch (8) is turned off based on a control circuit sequence (not shown) to reduce and cut off the fault current in the armature circuit that is automatically generated due to commutation failure, and the traction motor and protects Chopper.

(Summary of the Invention) This invention was made in order to further improve the reliability of the conventional system described above. When chopper commutation failure is detected, it outputs a command to turn off the brake main circuit and self-extinguishes the brake circuit. To provide a protection method for a chopper control device for an electric vehicle, in which a main motor and a chopper can be reliably protected by turning off an arc-shaped semiconductor element.

(Embodiment of the invention) An embodiment of the invention is shown in Fig. 2. In the figure, (1) to (
b), C71-C1• is the same as the conventional one. (A) is a semiconductor element with a self-extinguishing function like a gate turn-off thyristor. (2) is a circuit for turning off the self-extinguishing semiconductor element (A). In other words, in the case of a gate turn-off thyristor, it corresponds to an off-gate current generation circuit.

Next, the operation will be explained. In fig.

By turning on the semiconductor element (1), the brake series resistance (IQ
If the chopper (7) fails in commutation while short-circuiting and performing 1st regenerative brake control, the commutation failure detector an detects this and excites the high-speed trip coil port, and also activates the off-gate current generating circuit? A signal is given to υ to turn off the semiconductor element (1), and at the same time as commutation failure is detected, a brake/series resistor is inserted in series with armature aυ, so that armature αυ, field winding The main smoothing reactor (9), switch (8), chopper (7), high-speed flow device (6) quickly suppresses the fault current that automatically rises, and the high-speed current reducer (2) It is possible to reduce the interruption duty and suppress the fault current peak.

(Effects of the Invention) As explained above, according to the present invention, when chopper commutation failure is detected, a command to turn off the brake main circuit is output, and the self-arc-extinguishing semiconductor element is turned off. Since the winding and the series resistor are connected, the chopper circuit elements can be protected from breakdown, and the main motor can be reliably protected from flashover.

[Brief explanation of the drawing]

FIG. 1 is a conventional circuit diagram, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figure, (7) is chopper, συ
is the armature winding, (IFJ is a series resistor, 0 flaw is a commutation failure detector, 4 is a self-arc-extinguishing semiconductor element, and C211 is a circuit that turns off the self-arc-extinguishing semiconductor element. The same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa

Claims (1)

[Claims] A regenerative brake circuit is configured by connecting a resistor in series with the electric motor, and the switch connected in parallel with the resistor is turned off in high speed ranges and turned on in speed ranges below medium speed to perform regenerative brake control. E. In a protection method for a collar control device, the switch is made of a self-arc-extinguishing semiconductor element, and when chopper commutation failure is detected, a command is output to turn off the brake main circuit, and the self-arc-extinguishing semiconductor element is turned off. A method for protecting a chopper control device for an electric vehicle, characterized in that: