JPH04150716A - Feeder switcher - Google Patents

Abstract

PURPOSE:To obtain a feeder switcher which can suppress exciting surge current of a transformer mounted on an electric motor vehicle by controlling-the switching of a circuit breaker so that a current is fed through a reactor to an intermediate section for a predetermined time from the side at which power supply is initiated. CONSTITUTION:Under state (a), an electric vehicle 2 travels with power being fed from an AC power supply 4A. At that time, switching circuit breakers 11A, 11C are closed while a switching circuit breaker 11B is opened and thereby the power supplied for an intermediate section 10 and a trolley wire 3A are in-phase. Under state (b), when the electric vehicle 2 enters completely into the intermediate section 10, a track circuit 12 detects presence of the electric vehicle 2 and a circuit breaker control means opens the switching circuit breakers 11A, 11C followed by closing of the switching circuit breaker 11B with a time lag of about 0.35sec. At that time, an exciting surge current flows from an AC power supply 4B into the intermediate section 10 but it is suppressed by means of a reactor 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a feeder line switching device for switching power supply between two substations to an electric vehicle.

(Prior art) In general, power is supplied to each predetermined power supply section from multiple substations for the traveling section of an electric vehicle, but there is no power supply switching between two adjacent power supply sections. A feeder line switching device is installed for this purpose. In order to prevent contact between different power sources, this feeder line switching device has two sections formed by interrupting the trolley wire over a predetermined length (usually about several meters), and a section between these two section sections. A middle section portion is provided.

FIGS. 3(a), 3(b), and 3(c) are schematic diagrams for explaining the configuration and operation of such a conventional feeder line switching device. In this figure, a train 2 running on a rail 1 is shown by its pantograph on trolley wires 3A and 3.
Collects power from B. These trolley wires 3A and 3B have a first. AC power supplies 4A and 4B of the second substation are connected via AC circuit breakers 5A and 5B. And, potential current transformer (CT) 6A, 6B and potential transformer (PT)
7A and 7B detect the current and voltage supplied to the trolley wires 3A and 3B, and when an abnormality occurs, the AC circuit breakers 5A and 5B are opened by protective relays 8A and 8B. .

The feeder line switching device is provided at the point where the AC power supplies 4A and 4B meet, and has two section parts 9A and 9B, and a middle section part 10 formed between these section parts. , switching circuit breakers 11A and 11B (first and second circuit breakers) connected to the middle section portion 10.

Further, a track circuit 12 is installed on the rail 1, and the presence of the train 2 is detected at the point where the entire train 2 has completely entered the middle section 10. Based on the detection signal from the track circuit 12, the circuit breaker control device (not shown in FIG. 3) controls the switching circuit breakers 11A and II.
B is controlled to open and close.

Next, the operation of the conventional feeder line switching device configured as described above will be explained.

First, in the state shown in FIG. 3(a), the electric train 2 runs on power supplied from the AC power source 4A via the AC circuit breaker 5A. At this time, the switching circuit breaker 11A is closed, and the switching circuit breaker 11A is closed.
B is open, and the power supply phases of the middle section portion 10 and the trolley wire 3A are the same. Therefore, the electric train 2 can pass through the section section 9A and enter the middle section section 10 in the F direction.

Next, in Figure tiA3 (b), when the train 2 completely enters the middle section 10, the track circuit 12 detects the presence of the train 2, and the circuit breaker control device first switches on the switching circuit breaker 11A. It is opened, and after about 0.35 seconds, the switching circuit breaker 11B is closed. As a result, the power supply phase of the middle section 10 becomes the same as that of the trolley wire 3B, and the electric train 2 passes through the middle section 10 and passes through the section 9B by being supplied with power from the AC power source 4B.

Then, as shown in FIG. 3(C), when the train 2 completely passes through the middle section section 10, the track circuit 12
detects the absence of the circuit breaker and sends a detection signal to the circuit breaker control device. Based on this detection signal, the circuit breaker control device opens switching circuit breaker 11B, and closes switching circuit breaker 11A after about 0.35 seconds. As a result, the power supply phase of the middle section section 10 becomes the same as that of the trolley wire 3A again, and preparations for the next train's approach are completed.

(Problem to be solved by the invention!Fi) By the way, as explained in FIG. 3(b), the middle section section 10
No pressure is applied for about 0.35 seconds. Therefore, when the switching circuit breaker 11B is subsequently turned on, a large excitation inrush current will flow through the transformer mounted on the train 2.

If the load current of the AC power source 4B becomes large due to the presence of another train on the trolley wire 3B,
The composite value of this load current and magnetizing inrush current is very large (
Therefore, it enters the protection area of the protective relay 8B.

As a result, the AC circuit breaker 5B for Kiryu performs an unnecessary interrupting operation.

The present invention has been made in view of the above circumstances, and reduces the excitation inrush current of the transformer mounted on the electric car when switching the power supply while the electric car is running in the middle section. , it is an object of the present invention to provide a feeder line switching device that can prevent unnecessary breaking operations of heavy duty circuit breakers in substation trains.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a system in which a trolley wire is installed between a power supply section of a first substation and a power supply section of a second substation. It has first and second section parts that are interrupted by the length, and a middle section part provided between these two section parts, and when the electric car runs in this middle section part, In the feeder line switching device that switches the power supply between the first and second substations to an electric vehicle by opening and closing the connected circuit breakers of the first and second substations. A reactor inserted between a common connection point of a second circuit breaker and the middle section, a third circuit breaker connected in parallel to the reactor, and an end of the approach of the electric vehicle to the middle section. and a detection signal from the track circuit to detect the first. The first substation is configured such that current from the side of the second substation where power supply is newly started is supplied to the middle section through the reactor for a predetermined time.
The third circuit breaker is configured to include circuit breaker control means for controlling opening and closing of the third circuit breaker.

(Function) In the above configuration, if we consider the case where the electric vehicle moves from the power supply section of the first substation to the power supply section of the second substation,
First, when the electric vehicle completes its approach to the middle section, the track circuit detects the end of its approach.

Based on this detection, the circuit breaker control means controls the first to third circuit breakers so that the current from the second substation that newly starts power supply passes through the reactor for a predetermined period of time. At this time, the current from the second substation is supplied to the middle section through the second circuit breaker and reactor, but the reactor suppresses the excitation inrush current.

Then, after a predetermined period of time has elapsed, the excitation inrush current becomes sufficiently small, and the third circuit breaker connected in parallel to the reactor is closed. Therefore, the current from the second substation is
and is supplied to the middle section via the third circuit breaker.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. However, the same components as in FIG. 3 will be given the same reference numerals and redundant explanation will be omitted.

The feeder line switching device in the first cause has section portions 9A and 9B, a middle section portion 10, and switching circuit breakers 11A and IIB (first and second circuit breakers), similar to the one in FIG. There is. A reactor 13 is connected between the common connection point of the switching circuit breakers 11A and IIB and the middle section section 10.
is inserted, and a switching circuit breaker 11C as a third circuit breaker is connected in parallel to this reactor 13. Further, the circuit breaker control means 14 receives the detection signal from the track circuit 12, and sends out control signals for the switching circuit breakers 11A, IIB, IICJ, :il to control opening and closing of these circuit breakers.

Next, the operation of the feeder line switching device configured as described above will be explained with reference to FIGS. 2(a), 2(b), and 2(c). However, FIGS. 2(a) and (b).

In (c), for convenience of illustration, the circuit breaker control means 14 in FIG. 1 is omitted.

First, in the state shown in FIG. 2(a), the electric train 2 runs by being powered by the AC power source 4A via the AC circuit breaker 5A. At this time, the switching circuit breaker 11A.

11C is closed, switching circuit breaker 11B is open,
The power supply phases of the middle section portion 10 and the trolley wire 3A are the same. Therefore, the electric train 2 can pass through the section section 9A and enter the middle section section 10 in the F direction. Note that the train 15 located to the left of the train 2 is a preceding vehicle.

Next, in FIG. 2(b), when the train 2 completely enters the middle section 10, the track circuit 12 detects the presence of the train 2, and the circuit breaker control means 14 switches on the switching circuit breaker 11A.
, 11C is opened, and after about 0.35 seconds, the switching circuit breaker 11B is closed. At this time, the excitation inrush current from the AC power supply 4B flows through the switching circuit breaker 11B and the reactor 13 to the middle section portion 10, but the value of this excitation inrush current is suppressed by the reactor 13. Therefore, the action of the protective relay 8B prevents the AC circuit breaker 5B from performing unnecessary breaking operations.

Generally, the value of the magnetizing inrush current is halved after about 7 cycles, so approximately 2
After 00m5, the switching circuit breaker 11C is closed by the circuit breaker control means 14. As a result, the middle section portion 10 is
It is pressurized by the AC power supply 4B via the switching circuit breaker 11B and IIC.

Therefore, a voltage drop across both ends of the reactor 13 is not applied to the section portion 9B, and it is possible to prevent an arc from occurring when the train 2 passes through the section portion 9B.

Then, as shown in FIG. 2(C), when the train 2 completely passes through the middle section 10, the track circuit 12
It detects the absence of the circuit breaker and sends the detection signal to the circuit breaker control means 14. The circuit breaker control means 14 opens the switching circuit breaker 11B based on this detection signal, and further opens the switching circuit breaker 11B.
After 35 seconds, the switching circuit breaker 11A is turned on. This results in
The power supply phase of the middle section part 10 is ζ again the trolley wire 3A.
This means that preparations for the next train's approach are complete.

In addition, in the above embodiment, the excitation inrush current flows through the reactor 13.
The time it takes to pass through is set at about 200 m5, but of course this time can be increased or decreased depending on conditions.

(Effects of the Invention) As described above, according to the present invention, when switching power supply between two substations when an electric vehicle travels through the middle section, a new power supply is selected from among the two substations. Since the current on the starting side passes through the reactor and is supplied to the middle section for a predetermined period of time, it is possible to suppress the excitation inrush current installed in electric cars, and it is possible to suppress the excitation inrush current installed in electric cars. Unnecessary shutoff operations can be prevented.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and Figure 2 (
a), (b), and (C) are explanatory diagrams for explaining the operation of FIG. 1, and FIG. 3, (a), and (b). (c) is an explanatory diagram for explaining the configuration and operation of a conventional example. 2...Electric car, 3A, 3B...Trolley wire, 4A. 4B... 1st. AC power supply at the second substation, 9A. 9B... Section part, 10... Middle section part,
11A, IIB, IIC... 1st, 2nd. Third circuit breaker (switching circuit breaker), 12... Track circuit, 13... Reactor, 14... Circuit breaker control means.

Claims (1)

[Claims] The first substation is installed between the power supply section of the first substation and the power supply section of the second substation, and the trolley wire is interrupted by a predetermined length.
and a second section part, and a middle section part provided between these two section parts, and when the electric vehicle runs in this middle section part, the first and second sections connected to this middle section part are In a feeder line switching device that switches the power supply between the first and second substations to an electric vehicle by opening and closing a second circuit breaker, the common connection point of the first and second circuit breakers and a reactor inserted between the middle section, a third circuit breaker connected in parallel to the reactor, a track circuit for detecting the end of the electric vehicle's approach to the middle section, and the track circuit. Based on the detection signal from the first and second
A circuit breaker that controls the opening and closing of the first to third circuit breakers so that current from the side of the substation where power supply is newly started is supplied to the middle section through the reactor for a predetermined period of time. A feeder line switching device characterized by comprising: a device control means; and a feeder line switching device.