JPH0256253B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a power supply switching device that switches and connects negative switching to power supply buses connected to different AC power supplies, and in particular,
The present invention relates to a power supply switching device suitable for application to a connecting portion of trolley wires receiving power from different AC power sources.

[Technical background of the invention]

Generally, when feeder lines installed along an AC electric railway are connected to different power sources, a power supply switching device as shown in Figure 1 is used at the butt ends of the trolley wires that receive power from these feeder lines. ing.

That is, the feeder wire 3 connected to the AC power source 1 and the trolley wire 5 are connected, and the feeder wire 4 and the trolley wire 6, which are similarly connected to the AC power source 2, are connected, and the ends of these trolley wires 5 and 6 are connected. are connected to both ends of another trolley wire 7 via insulating devices 8 and 9 called sections (hereinafter simply referred to as sections). A sheath breaker 12 is provided between 6 and 7, respectively.

In addition, a train position detection device 14 along the track 13
are provided, and the shield switches 11 and 12 and the train position detection device 14 constitute the main parts of the power supply switching device referred to herein.

Here, the bow breakers 11 and 12 are not turned on at the same time, and for example, when the train 10 is running in the direction of arrow A in the section where the trolley wire 5 is installed, the bow breakers 11 and 12 are not turned on at the same time. is turned on, and at this time the squeegee/breaker 12 is open. Therefore, since there is no phase difference between the trolley wires 5 and 7, power running is possible even when passing through section 8. Next, when the train 10 passes through the section 8 and proceeds along the section of the trolley wire 7, the train position detection device 14 detects this and opens the shingle breaker 11, and then Insert 12. Therefore, since there is no phase difference between the trolley wires 6 and 7, power running is possible even when passing through the section 9. Next, train 10
When the train passes through section 9 and begins to move along the section of trolley wire 6, the train position detection device 14 detects this and opens the edge breaker 12, and then closes the edge breaker 11. to prepare for the arrival of a later train.

Therefore, even if the voltage phases of the trolley wires 5 and 6 are different from each other because the phases of the AC power supplies 1 and 2 are different, due to the actions of the cable breakers 11 and 12 and the train position detection device 14, The trolley wires 5 and 6 are no longer electrically connected directly, which prevents current from flowing between the power supplies if they are accidentally connected.

[Problems with background technology]

Although such a conventional power supply switching device can certainly prevent a situation in which the trolley wires 5 and 6 having different voltage phases are electrically connected directly, the front disconnectors 11 and 12 are Since they open and close every time a train passes, the frequency of operation increases as the number of trains in operation increases, resulting in severe mechanical wear. For this reason, there are disadvantages in that the number of inspections of the breaker must be increased and parts must be replaced frequently.

In addition, in order to prevent the line disconnectors 11 and 12 from being turned on at the same time, the other one is turned on after a certain period of time has passed after one of them has been opened, so the trolley line can cause a train power outage. 7, the non-voltage time becomes long, and in addition to this, since voltages with different phases are applied, the inrush current becomes relatively large.

Note that the above-mentioned power supply switching device is not limited to the butt ends of trolley wires connected to different power sources, but can also be used to switch between a commercial power supply system and a private power generation system, for example, by replacing the train position detection device with another one. Although it can be applied to mutual switching or system switching of power transmission and distribution lines, even in such cases there are drawbacks such as a longer power outage time and an increase in rush current.

[Purpose of the invention]

The present invention has been made to eliminate the drawbacks of the conventional products described above, and does not require any special measures against wear even when the power supply is switched frequently.
It can prevent temporary power outages on the load side, and
An object of the present invention is to provide a power supply switching device that can suppress inrush current when switching power supplies to a low level.

[Summary of the invention]

In order to achieve the above object, the power supply switching device of the present invention has a first power supply bus and a second power supply bus connected to different AC power supplies connected to a third power supply bus through a section. , a phase detector that detects the voltage phase of the first and second power supply buses, a position detector that detects the connection position of the load, and a third power supply that obtains power from the first power supply bus. A phase shifter capable of supplying power to the bus and continuously changing the voltage phase of the third power bus, the load being switched and connected from the first power bus to the third power bus. Based on the output signals of the phase detector and the position detector, the phase shifter holds the voltage phase of the third power bus in synchronization with the voltage of the first power bus until the load reaches the third power bus. The phase shifter is configured to change the voltage phase of the third power bus to synchronize it with the voltage of the second power bus while the third power bus is connected to the third power bus.

[Embodiments of the invention]

The present invention will be described below based on an embodiment in which the present invention is applied to an AC electric railway.

FIG. 3 shows the configuration of a power supply switching device according to the present invention. Elements that are the same as those shown in FIG. A detector 15 and a phase detector 16 for detecting the voltage phase of the trolley wire 6 are newly provided, and a phase shifter 17 is provided in place of the cutters 11 and 12 shown in FIG.

Here, the phase detectors 15 and 16 generate pulses when the sinusoidal AC voltage reaches 0 [V] or the maximum value, and these pulse signals are applied to the phase shifter 17.

On the other hand, the phase shifter 17 rectifies the alternating current voltage of the trolley wire 5, converts it into direct current, and then converts it back into alternating current using the inverter. The phase can be changed continuously. Note that the pulse signals from the phase detectors 15 and 16 are constantly applied to this phase shifter 17, and the train position detection device 14
generates an AC voltage that is synchronized with the AC voltage of the trolley wire 5 until it detects a train, and adjusts its phase so that this AC voltage is synchronized with the AC voltage of the trolley wire 6 when the train position detection device 14 detects a train. Further, after the train has passed, the phase of the trolley wire 5 is continuously changed so as to be synchronized with the alternating current voltage of the trolley wire 5.

The operation of the power switching device configured as described above will be explained below.

First, when the train 10 is running in the direction of arrow A in the section where the trolley wire 5 is installed, the train position detection device 14 outputs a signal corresponding to "no train", and the phase shifter 17 outputs a signal corresponding to "no train". The voltage phase of the trolley wire 7 is maintained in synchronization with the voltage phase of the trolley wire 5. Therefore, even when the train 10 passes through section 8, power running is possible.

Next, when the train 10 passes through the section 8 and proceeds along the section of the trolley line 7, the train position detection device 14 detects this on the way and sends a signal corresponding to the presence of the train to the phase shifter 17. Add. As a result,
The phase shifter 17 continuously changes the voltage phase of the trolley wire 7 to synchronize it with the voltage of the trolley wire 6. Of course, this phase shift is due to the fact that the train 10 is on the trolley line 7.
The race is completed in a very short period of time so that it can be completed while driving. Thereby, the train 10 can be powered even when passing through the section 9.

Subsequently, when the train 10 passes the section 9 and starts running on the section of the trolley line 6, the output of the train position detection device 14 changes to a signal corresponding to "no train", so the phase shifter 17 Trolley line 7 again
The voltage phase of the contact wire 5 is continuously changed to maintain it in synchronization with the voltage of the trolley wire 5.

As is clear from this, when the train 10 passes through sections 8 and 9, the trolley wires on both sides are kept in the same phase, so no power flow occurs between the power supplies, and moreover, the phase shifter 17 is a thyristor. Because it is a so-called stationary type that uses elements such as, even if the number of trains in operation increases,
Mechanical wear, which was a problem when using a heat cutter, is eliminated.

In addition, while the train 10 is running on the section of the trolley wire 7, only the voltage phase of the trolley wire 7 is continuously shifted, so that it is possible to avoid the phenomenon of the train 10 temporarily experiencing a power outage, and The current can be suppressed to an extremely low value.

Next, FIG. 3 shows the configuration of another embodiment of the power supply switching device according to the present invention. In particular, it is difficult to install a train position detection device on the ground side at the butt part of the trolley wire, and moreover, when the train is , and is applied when traveling in both directions (downward). In the figure, the same reference numerals as in FIG. 2 indicate elements that are the same or have the same effect.

Here, the trolley wire connecting the ends of the trolley wires 5 and 6 via sections 8 and 9 is divided into two by another section 20, and the trolley wire 5 and one of the two halves, the trolley wire 7a, are divided into two by another section 20. A phase shifter 18 is provided between the trolley wire 6 and the other trolley wire 7b divided into two, and a phase shifter 19 is provided between the trolley wire 6 and the other trolley wire 7b divided into two.
Current detectors 21 and 22 are provided, respectively, to detect the current on the output side.

In FIG. 3, the pulse signals of the phase detectors 15 and 16 are constantly applied to the phase shifters 18 and 19, and unless the train 10 runs on the section of the trolley wire 7a or 7b, the current detector Unless both 21 and 22 detect a load current, phase shifter 18 generates an AC voltage synchronized with the voltage of trolley wire 5, and phase shifter 19 generates a voltage synchronized with trolley wire 6.

Here, when the train 10 travels in the direction of arrow A and reaches the section of the trolley wire 7a, the current detector 21
detects the load current of the train 10 and applies a signal corresponding to the presence of the train to the phase shifter 18. Therefore, the phase shifter 18 continuously changes the output voltage phase,
The voltage phase of the trolley wire 7a is synchronized with the voltage of the trolley wire 6 while the train 10 is traveling in the section of the trolley wire 7a. As a result, just before the train 10 passes through the section 20, the trolley lines 7a, 7
The voltages at b and 6 are all in phase and can pass through sections 20 and 9 without any hindrance.

On the other hand, when the train 10a travels in the direction of arrow B and reaches the section of the trolley wire 7b, the current detector 22
detects the load current of the train 10a and applies a signal corresponding to the presence of the train to the phase shifter 19. Therefore, the phase shifter 19 continuously changes the output voltage phase to synchronize the voltage phase of the trolley wire 7b with the voltage of the trolley wire 5 while the train 10a is traveling in the section of the trolley wire 7b. As a result, train 10
Immediately before a passes section 20, the voltages on trolley wires 7b, 7a and 5 are all in phase and can pass through sections 20 and 8 without any hindrance.

However, by adopting the configuration shown in Figure 3, it is difficult to install a train position detection device on the ground side.
Furthermore, even when the train runs in both directions, ``up'' and ``down'', it is possible to avoid a temporary power outage of the train and to suppress the inrush current to an extremely low value.

In addition, in each of the above embodiments, the power supply switching device was described when the train runs on the butt ends of the trolley wires that receive power from different AC power sources via the feeder line, but the train position detection device may be used in other ways. By replacing it with a new one, it can be applied to mutual switching between a commercial power supply system and a private power generation system, or to switching between power transmission and distribution lines.

〔Effect of the invention〕

As is clear from the above description, according to the power switching device of the present invention, even when power switching is performed frequently, special measures against wear are not required.
It is possible to eliminate the situation where the load side temporarily loses power when switching the power supply, and to suppress the overflow current at the time of switching the power supply to an extremely low level.

In addition, when the configuration shown in FIG. 3 is adopted, the train position detection device normally installed on the ground side can be omitted, and power supply switching not limited to the running direction of the train becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram showing the configuration of a conventional power switching device for an AC electric railway, and FIG. 2 is a block diagram showing the configuration of an embodiment of the power switching device according to the present invention applied to an AC electric railway. FIG. 3 is a block diagram showing the configuration of another embodiment of the power supply switching device according to the present invention applied to an AC electric railway. 1, 2... AC power supply, 3, 4... Feeding line, 5, 6,
7, 7a, 7b... Trolley wire, 8, 9, 20... Insulating device, 10, 10a... Train, 11, 12... Line breaker, 13... Track, 14... Train position detection device, 1
5, 16... Phase detector, 17, 18, 19... Phase shifter, 21, 22... Current detector.

Claims (1)

[Scope of Claims] 1. A first power bus and a second power bus connected to different AC power supplies are each connected to a third power bus through an insulating device, and the first power bus In a power supply switching device that first switches and connects a load connected to the third power supply bus to the third power supply bus, and then switches and connects the load connected to the second power supply bus, the first power supply bus and the second power supply bus a phase detector that detects each voltage phase; a position detector that detects the connection position of the load; and a phase shifter capable of continuously changing the voltage phase of the third power supply bus, and the load is switched and connected to the third power supply bus based on the output signals of the phase detector and the position detector. the phase shifter holds the voltage phase of the third power bus in synchronization with the voltage of the first power bus until the load is connected to the third power bus; A power supply switching device characterized in that the phase shifter is configured to change the voltage phase of the third power supply bus to synchronize it with the voltage of the second power supply bus. 2. A first power supply bus and a second power supply bus that are connected to different AC power supplies are each connected to a third power supply bus through an insulating device, and the load connected to the first power supply bus is connected to the first power supply bus. , in a power switching device that first switches and connects to the third power bus and then switches and connects to the second power bus, an insulating device that divides the third power bus into two in the longitudinal direction; a phase detector that detects the voltage phases of the first power bus and the second power bus, respectively;
a current detector that detects the current of the divided third power bus; and a current detector that obtains power from the first power bus and supplies power to one of the divided third power bus; , a first phase shifter that can continuously change the voltage phase of one of the power busses; and a first phase shifter that obtains power from the second power bus and supplies power to the other of the third power bus that is divided into two. and a second phase shifter capable of continuously changing the voltage phase of the other power supply bus, and based on the output signal of the phase detector, the second phase shifter , the voltage phase of the other divided third power supply bus is held in synchronization with the voltage of the second power supply bus, and the load is controlled based on the output signals of the phase detector and the current detector. The first
A phase shifter holds one voltage phase of the third power bus divided into two in synchronization with the voltage of the first power supply bus, and the load is held in synchronization with the voltage of the third power bus divided into two. The first phase shifter is configured to change the voltage phase of one of the bisected third power bus to synchronize it with the voltage of the second power bus while the first phase shifter is connected to one of the two. A power supply switching device characterized by: