JPH07333279A - Leakage test equipment - Google Patents

Abstract

PURPOSE:To dispense with power source equipment such as a rectifier used exclusively for a test, in leakage test equipment for a DC type electric railroad wherein an output power of a main rectifier is supplied between a feeder line and a rail through a DC high-speed breaker. CONSTITUTION:A series circuit comprising electromagnetic contactors 21 to 24, a reactor 9 of a filter circuit 11 and Hall CT 14 is connected parallel to a disconnector 5 inserted in an electric circuit connecting a negative pole of a main rectifier 1 and a rail together, and resistors 31 to 33 are connected parallel to the electromagnetic contactors 22 to 24 respectively. At the time of a leakage test of a feeder line 3a, the main rectifier 1 is operated with the disconnector 5 opened and a DC high-speed breaker 2a and the electromagnetic contactor 21 are made. A direct current flowing at this time is measured by a DC ammeter 16. When the measured current is a prescribed value or below, the electromagnetic contactors 22 to 24 are then turned ON sequentially so that a resistance value be changed over, and the current at each time is measured by the DC ammeter 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leakage test apparatus for measuring a leakage current between a feeder and a rail of a DC electric railway.

[0002]

2. Description of the Related Art In the conventional DC type electric railway feeder equipment, the leakage current between the electric power line (rail line) and the rail is measured to determine the insulation deterioration of the electric power line and to detect the contact due to foreign matter. Was. To measure this leakage current,
For example, a leak test device as shown in FIG. 2 has been used.

In FIG. 2, reference numeral 1 is a main rectifier for converting AC power of a substation into DC. The output power of the main rectifier 1 is fed through the DC high-speed circuit breakers 2a to 2d to the feeder line 3a to
Is supplied to 3d. 4a and 4b are dead sections for dividing feeder lines. The negative electrode of the main rectifier 1 is connected to a rail (not shown) via a disconnector 5.

AC power of a low-voltage power supply (not shown) for a leak test is introduced to a rectifier 8 for a leak test via an electromagnetic contactor 6 and a step-up transformer 7 on the AC side. The rectified output of the rectifier 8 is smoothed by the filter circuit 11 including the reactor 9 and the capacitor 10. The DC output current of the filter circuit 11 is supplied to the feeders 3a to 3d through the electromagnetic contactors 15a to 15d for connecting the feeders. The rectifier 8
The negative electrode of is connected to a rail (not shown). A resistor 12 and a DC voltmeter 13 are connected in series between the positive and negative output terminals of the filter circuit 11. The filter circuit 11
A hole CT14 for current detection is inserted in an electric path connecting between the magnetic contactors 15a to 15d. 16 is a direct current ammeter.

[0005]

In the apparatus constructed as described above, the characteristics of the DC electric railway are used as the power source (power source, electromagnetic contactor 6, step-up transformer 7, rectifier 8, etc.) exclusively for the leakage test apparatus. Also, a rated DC 1500 volt, 0.1 amp is required. Therefore, the size of the device is increased and the price of the device is soared.

The present invention has been made in view of the above points, and an object thereof is to provide a leakage test apparatus that does not require a power supply facility such as a dedicated rectifier.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a leakage test apparatus for a DC type electric railway, which supplies the output power of a DC power source between a feeder and a rail via a DC circuit breaker, wherein a negative electrode of a main rectifier of the DC power source is used. A first switchgear is inserted in an electric path connecting the rail and a rail, and a series circuit including a second switchgear and a variable resistance part for arbitrarily switching a resistance value and a current measuring device is connected in parallel to the first switchgear. It is characterized by being connected.

[0008]

To perform the leakage test, first, the first switchgear is opened and the second switchgear is turned on. Then, the main rectifier is operated to turn on the DC circuit breaker, and the current flowing through the series circuit when the resistance value of the variable resistance portion is switched is measured by the current measuring device, whereby the leakage current data can be obtained. Since the main rectifier is used as the power supply during the leakage test, it is not necessary to provide another dedicated power supply device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the electromagnetic contactors 6, 15a to 15d, the step-up transformer 7 and the rectifier 8 shown in FIG. 1, the same parts as those in FIG. 2 are indicated by the same reference numerals. An electromagnetic contactor 21, resistors 31, 32, 33 and a reactor 9 of the filter circuit 11 are connected in series between both ends of the disconnector 5. An electromagnetic contactor 2 is provided for the resistors 31, 32, 33.
2, 23 and 24 are respectively connected in parallel. A Hall CT 14 is inserted in the electric path connecting the reactor 9 and the rail, and a DC ammeter 16 is connected to the output side thereof. Between both ends of the capacitor 10 of the filter circuit 11,
The resistor 12 and the DC voltmeter 13 are connected in series. A fuse 40 is connected between the DC voltmeter 13 and the positive terminal of the main rectifier 1.

In the apparatus constructed as described above, in order to perform a leakage test, first the disconnector 5 is opened and the electromagnetic contactor 2 is opened.
Input 1. Next, the main rectifier 1 is operated to turn on the DC high-speed circuit breaker 2a, and the DC current flowing at that time is measured by the DC ammeter 16. If the current is less than the specified value, the electromagnetic contactors 22, 23, 24 are turned on next and the currents flowing at that time are measured by the DC ammeter 16. Further, the voltage of the capacitor 10 is measured by the DC voltmeter 13, the data of the leakage current is obtained by the voltage and the current, and the voltage is measured by the voltmeter 13 and the ammeter 16 with all the magnetic contactors 21 to 24 turned on. Measure the current and check the leakage current.

The above operation is performed by the DC high speed circuit breakers 2b to 2d.
For each of the above, and measure the leakage current of the feeder.
As described above, it is not necessary to provide another dedicated power supply device as a power supply for the leakage test, and the leakage test can be reliably performed using the existing main rectifier 1.

The first and second switching devices are not limited to the disconnecting switch 5 and the electromagnetic contactor 21, but other switching devices may be used. Further, the variable resistance portion is not limited to short-circuiting and opening the both ends of the resistors 31 to 33 by the electromagnetic contactors 22 to 24 as in the above-described embodiment, but is constituted by other means capable of arbitrarily switching the resistance value. You may.

[0013]

As described above in detail, according to the present invention, the first switchgear is inserted in the electric path connecting the negative electrode of the main rectifier of the DC power supply and the rail, and the first switchgear is provided with the second switchgear. Since a series circuit consisting of a switchgear and a variable resistance part that arbitrarily switches the resistance value and a current measuring device was connected in parallel, a power supply facility such as a rectifier dedicated to the leakage test device was not required, so the entire device was downsized, The device price can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a conventional leakage test device for a DC electric railway.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main rectifier 2a-2d ... DC high-speed circuit breaker 3a-3d ... Feeder wire 5 ... Disconnector 11 ... Filter circuit 13 ... DC voltmeter 14 ... Hall CT 16 ... DC ammeter 21-24 ... Electromagnetic contactors 31-33 … Resistor 40… Fuse

Claims (1)

[Claims] 1. A leakage test apparatus for a DC type electric railway, which supplies the output power of a DC power supply between a feeder and a rail via a DC circuit breaker, wherein a first electric line is provided in a circuit connecting a negative electrode of a main rectifier of the DC power supply and the rail. Leakage, characterized in that the switching device is inserted, and the first switching device is connected in parallel with the second switching device and a series circuit composed of a variable resistance section for arbitrarily switching the resistance value and a current measuring device. Test equipment.