JPH11268559A - Failure detection device for selector switch for a.c. electric railroad - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the failure detection device of selector switch for A.C. electric railroad for correctly detecting the failure of a selector switch without needing a broad installation space. SOLUTION: An optical fiber incorporated insulator is stoodly provided in a position where two power sources 1 and 2 are connected to a different power source switching section 3 via selector switches 4 and 5 to detect an electric current flowing into the section 3 from the respective switches 4 and 5 by optical CTs 9 and 10 equipped on both the sides of the head part of the insulator, respectively. The optical signals of the respective optical CTs 9 and 10 are inputted into the failure detection relay 17 of th the selector switch through the optical fiber corporated insulator, and failure is judged when both the CTs 9 and 10 detect the electric current concurrently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a failure of a switching switch for an AC electric railway used at a place where different power sources meet, such as a bullet train.

[0002]

2. Description of the Related Art In an AC electric railway, electric power is supplied to a train by a single-phase alternating current. However, since substations are arranged every several tens of kilometers, different power supply matching points occur. The power from the two power supplies supplied to this point cannot be directly connected because the phases are generally different. In the past, a non-pressurized section where power was not supplied from any power source for 8 m was provided so that trains would coast over this section. In order to prevent the drop, power must also be supplied to the different power supply abutting section so that the train can pass without power.

Therefore, as shown in FIG. 4, power lines from two power sources 1 and 2 are connected to different power source switching sections 3 via two switching switches 4 and 5 so that, for example, a train moves from left to right. When the train 6 proceeds, one of the switching switches 4 is always turned on, and power is supplied from the power supply 1 until the train 6 enters the different power supply switching section 3, and when the train 6 advances to a specific position, the switching switch 4 is switched on. Open and switch 5
Is supplied to the different power supply switching section 3 so that power is supplied from the power supply 2. However, these switching switches 4 and 5 have a large number of trains 6 in different power supply switching sections 3.
There is a demand for a system in which the failure rate is high because the on / off operation is frequently repeated each time the vehicle travels.

For this reason, as shown in Japanese Patent Publication No. 6-100631, an electromagnetic induction type CT for detecting overcurrent is arranged between the two power supplies 1 and 2 and the switching switches 4 and 5, respectively. A fault detection method for detecting an overcurrent flowing when the fault occurs has been developed. However, for this purpose, a large electromagnetic induction type CT for detecting overcurrent must be placed on the power line, and the existing Shinkansen substations and feeder sections cannot secure sufficient installation space, so that they have been put to practical use. Not in a situation.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and detects a failure of a switching switch accurately without requiring a large installation space. It was made to provide a device.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a fault detecting device for a switchgear for an AC electric railway according to the present invention is provided with two power lines from two power sources exclusively. At the position connected to the different power supply switching section of the AC electric railway via the switching switch, an optical fiber built-in insulator equipped with an optical CT on each side of the head is erected, and from each switching CT by each optical CT. It is characterized in that a current flowing in the different power supply switching section is detected. It is preferable that an optical signal of each optical CT is taken out through a built-in optical fiber insulator, input to a failure detection relay of the switching switch, and a failure is determined when both optical CTs detect current simultaneously.

According to the present invention, only one small optical fiber built-in insulator having an optical CT on each side of the head is required to be set up for each different power supply switching section, which requires a wide installation space as in the past. And not. In addition, since the built-in optical fiber insulator and the optical CT can be made independent, there is no possibility that the existing equipment will be burdened.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. In FIG. 1, 1 and 2 are two power supplies,
Reference numeral 3 denotes a different power supply switching section arranged every tens of kilometers. On both sides of the power supply line 7 to the different power supply switching section 3, two switching switches 4, 5 are arranged, and the power supply 1 is connected to the always-on switching switch 4, and the power supply 2
Is connected to a normally open switchgear 3. These switching switches 4, 5 are exclusively turned on,
They will not be submitted at the same time. When the train advances to a specific position in the different power supply switching section 3, the switching switches 4 and 5 are switched, and the power supply of the different power supply switching section 3 is instantaneously switched from 1 to 2 as in the related art.

In the present invention, a single optical fiber built-in insulator 8 is set up at a position where the power lines from these two power supplies 1 and 2 are connected to the different power supply switching section 3 via the switching switches 4 and 5. Set up. This insulator 8 with a built-in optical fiber is smaller than a conventional electromagnetic CT for detecting overcurrent. FIG. 2 is a view showing this part, and the insulator 8 with a built-in optical fiber is used.
Light CT9, 10 is supported on both sides of the head. These light CTs 9 and 10 are attached to a cap fitting 12 of an insulator 8 with a built-in optical fiber by a hollow arm 11. As shown in FIG. 3, each of the light CTs 9 and 10 has an annular core 15 surrounding bus bars 13 and 14 extending from each of the switching switches 4 and 5, and has a structure in which an optical sensor such as a Faraday element is inserted into the gap. ing.

The light CT 9 detects a current flowing through the bus bar 13 extending from the switching switch 4 toward the different power supply switching section 3 and converts the current into an optical signal. The optical CT 10 detects a current flowing through the bus bar 14 extending from the switching switch 5 toward the different power supply switching section 3 and converts the current into an optical signal. These optical signals are taken out through an optical fiber penetrating the inside of the insulator 8 with the built-in optical fiber, and input to the failure detection relay 17 of the switching switch via the O / E converter 18 shown in FIG. Is done. As described above, these switching switches 4 and 5 are originally turned on exclusively, so that the current should flow through only one of the bus bar 13 and the bus bar 14 in a normal state. Therefore, when both the light CTs 9 and 10 detect the current at the same time, the failure detection relay 17 of the switching switch determines that a failure has occurred in the switching switches 4 and 5 and notifies the power command office of the occurrence of the failure.

In this manner, the failure detection device for a switching switch for AC electric railway according to the present invention can reliably detect a failure of the switching switches 4, 5 used at a location where different power sources meet. In addition, the insulator 8 with built-in optical fiber used in the present invention is smaller than the conventional electromagnetic induction type CT for overcurrent detection, and can be applied to an existing Shinkansen where installation space is scarce. In addition, a single optical fiber built-in insulator 8
The failure of both switching switches 4 and 5 can be detected by the light CTs 9 and 10 provided on both sides of the device, and the equipment cost can be reduced. Further, since the optical fiber built-in insulator 8 is a self-supporting type, there is no burden on the existing bus bars 13, 14 and the like.

[0012]

As described above, the fault detecting device for a switching switch for AC electric railway according to the present invention can accurately detect the failure of the switching switch without requiring a large installation space. There is an advantage that it can be applied to an existing Shinkansen where the installation space for the electromagnetic induction type CT cannot be secured.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of a different power supply butting portion to which a failure detection device of the present invention is attached.

FIG. 2 is a front view of the failure detection device according to the present invention.

FIG. 3 is a side view of the failure detection device of the present invention.

FIG. 4 is an electric circuit diagram of a general different power supply matching portion.

[Explanation of symbols]

1 power supply, 2 power supplies, 3 different power switch section, 4 switch, 5 switch, 6 train, 7 power supply line to different power switch section, 8 optical fiber built-in insulator, 9 optical CT, 10 optical CT, 11 hollow arm, 1
2 cap fittings, 13 busbars, 14 busbars,
15 annular core, 16 optical cable, 17 switching relay failure detection relay, 18 O / E converter

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tetsuo Usagi 2-8-8 Hikaricho, Kokubunji-shi, Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor ▲ Den ▼ Kenji Izu Suda, Mizuho-ku, Nagoya-shi, Aichi No. 56, Machimachi, Nihon Insulator Co., Ltd.

Claims (2)

[Claims] An optical CT is provided on both sides of a head at a position connected to a different power supply switching section of an AC electric railway via two switching switches to which power lines from two power sources are exclusively turned on. A fault detecting device for a switching switch for an AC electric railway, wherein a built-in optical fiber insulator is provided and a current flowing from each switching switch to a different power supply switching section is detected by each optical CT. 2. The optical signal of each optical CT is taken out through a built-in optical fiber insulator and input to a failure detection relay of a switching switch, and when both optical CTs simultaneously detect current, it is determined that a failure has occurred. Failure detection device for switching switches for AC electric railways.