KR102236198B1 - Apparatus for pre-determining ground fault of electric railway - Google Patents

Abstract

The present invention relates to an apparatus for predetermining the existence of a ground fault of a low-voltage electric railway track which prevents high-voltage ground fault accidents. The apparatus for predetermining the existence of a ground fault of a low-voltage electric railway track comprises: a switch for a high-voltage feeding busbar, a circuit breaker for high voltage feeding, a switch for a high-voltage feeding track, a PT for high voltage detection, a switch for a high voltage feeding AT, an AT for high-voltage feeding, and a CT for high-voltage current detection in a high-voltage feeding system; and a transformer primary-side circuit breaker for a test with external power of AC 380V, a main transformer for low voltage, a main transformer secondary-side circuit breaker for low voltage, a circuit breaker for low voltage feeding, a PT for low voltage detection, a switch for low-voltage power selection, a low-voltage power cable connection unit, a CT for low-voltage current detection, a high/low-voltage transfer switch, a CT for high-voltage current detection, a CT for low-voltage current detection, a high/low-voltage transfer switch, and a PT for high-voltage current detection in a high-voltage feeding system. A ground fault determination unit connected to SMARCON is configured such that the high/low-voltage transfer switch selects high voltage or low voltage by control of SMARCON.

Description

A device for pre-determining the presence or absence of a ground fault in a low-voltage catenary line {APPARATUS FOR PRE-DETERMINING GROUND FAULT OF ELECTRIC RAILWAY}

The present invention relates to a device for preliminary determination of the presence or absence of a ground fault on a low-voltage catenary line of an electric railway, and more specifically, by determining the presence or absence of a ground fault immediately before power supply after completing the maintenance work of the power supply system, it occurs when the main voltage of the power supply system is applied in a ground fault state It relates to a device for preliminary determination of the presence or absence of a ground fault in a catenary line using a low voltage power source in order to prevent a high voltage ground fault.

For the safety of workers who maintain and repair the catenary lines in the electric railway power supply system, the work is done after installing a safety ground fault device in the high-voltage power supply system.After the maintenance work is completed, the safety ground fault device is not removed (ground fault condition). There was a problem that a high-voltage ground fault occurred by applying this voltage to the power supply system.

Republic of Korea Patent Publication No. 10-0789412

The present invention is an invention invented to solve the above-described problems, and the main object of the present invention is to determine the presence of a ground fault immediately before power supply after completing the maintenance work of the power supply system using a device for preliminary determination of the presence or absence of a ground fault on a low-voltage catenary line. In this state, it is intended to prevent high-voltage ground faults caused by main voltage pressurization of the power supply system.

The device for preliminary determination of the presence or absence of a ground fault on a low-voltage catenary line according to an embodiment of the present invention for achieving the above object,
In the high-voltage power supply system, a high-voltage power supply circuit breaker and a high-voltage power supply line switch are connected in series to the secondary of the high-voltage power supply bus switch, and a high-voltage voltage detection PT is connected in parallel to the secondary of the high-voltage power supply line switchgear. A high-voltage switch and a high-voltage power supply AT are connected in series, and a high-voltage current detection CT is installed between the secondary of the high-voltage power supply bus switch and the primary of the high-voltage power supply circuit breaker;
In the low voltage power supply system, an external power source of AC 380V is connected in series to the secondary circuit breaker of the test transformer primary circuit breaker, low voltage peripheral voltage and low voltage peripheral voltage, and 1 of the low voltage power supply circuit breaker to the secondary of the secondary circuit breaker of the low voltage peripheral voltage. The car is connected, and the PT for low voltage voltage detection is connected in parallel to the secondary of the circuit breaker for low voltage supply, the switch for selecting the low voltage power and the connection of the low voltage power cable are connected in series, and the secondary and low voltage supply of the secondary circuit breaker for the low voltage peripheral voltage A CT for low voltage current detection is installed between the primary of the dedicated circuit breaker, the high voltage current detection CT and the low voltage current detection CT are connected to the CT input terminal of the high/low voltage transfer switch, and the high voltage voltage detection at the PT input terminal of the high/low voltage transfer switch PT for low voltage voltage detection and PT for low voltage voltage detection are connected in parallel, the input terminal of the ground fault detection unit is connected to the output terminal of the high/low voltage transfer switch, and the ground fault detection unit connected to SMARCON allows the high/low voltage transfer switch to select high or low voltage under the control of SMARCON. Be composed;

The high/low voltage transfer switch keeps C1, C2, C6 on, and C3, C4, and C5 off when the high-voltage power supply system is in the off state, but C5 is turned on when the central processing unit commands the selection of the low-voltage power supply system. (On), the high pressure CT is short-circuited, C1 is off, the high pressure CT is separated, C2 is sequentially turned off, C4 is on, the low pressure PT is connected, and C3 is turned on ( When the low-voltage CT is connected by On) and C6 is finally turned off and the low-voltage CT opens the short circuit, the transfer is completed from the high-voltage power supply system to the low-voltage power supply system.

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According to the above-described technical problem solving means, the present invention determines whether or not there is a ground fault immediately before the power supply after completing the maintenance work of the power supply system using a device for preliminary determination of the presence or absence of a ground fault on the low-voltage catenary line. It has the effect of preventing high-pressure ground faults in advance.

1 is an exemplary block diagram of an apparatus for pre-determining the presence or absence of a ground fault on a low-voltage catenary line according to an embodiment of the present invention.
2 is an exemplary view of a low-voltage power supply system in the case of using a device for preliminary determination of ground faults on a low-voltage catenary line according to an embodiment of the present invention.
3 is an exemplary block diagram of a high/low voltage switching switch of a device for pre-determining the presence or absence of a ground fault on a low voltage catenary line according to an embodiment of the present invention.
FIG. 4 is an exemplary view of a feed system of a high-low-voltage transfer switch of a device for preliminary determination of ground fault on a low-voltage catenary line according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the embodiments will be described so that those of ordinary skill in the art can easily implement the present invention.

As those of ordinary skill in the art to which the present invention pertains can be easily understood, the following embodiments may be modified in various forms without departing from the concept and scope of the present invention. As far as possible, the same or similar parts are indicated using the same reference numerals in the drawings.

The terminology used in this specification is for referring only to specific embodiments and is not intended to limit the present invention. Singular forms as used herein also include plural forms unless the phrases clearly indicate the opposite.

As used herein, the meaning of "comprising" specifies a specific characteristic, region, integer, step, action, element and/or component, and other specific characteristic, region, integer, step, action, element, component, and/or It does not exclude the presence or addition of the military.

All terms including technical and scientific terms used in the present specification have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. The terms defined in the dictionary are further interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and are not interpreted in an ideal or very formal meaning unless defined.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

In addition, the configuration name of FIG. 1 will be defined as follows.

지락판별부: 전차선로 지락유무 판별부;

HLTS(High-Low Transfer Switch, 고저압 절체스위치): 고저압 급전계통의 PT, CT, 2차 전압전류를 선택하는 장치

SMARCON: 저압시험용 차단기와 개폐기를 순차적으로 제어하기 위한 절차를 실행하고, 상위의 타설비와 데이터를 교환하기 위한 장치.①89FnM: Switchgear for high-voltage power supply buses; ② High-pressure CT: CT for high-voltage current detection; ③52Fn: High voltage power supply circuit breaker (n=1,2,3,4); ④89Fn: Switchgear for high-voltage power supply lines (n=1,2,3,4); ⑤ High pressure PT: PT for high voltage voltage detection; ⑥89ATn: Switchgear for high-voltage power supply AT (n=1,2,3,4); ⑦ATn: AT for high voltage supply (n=1,2,3,4); ⑧MCCB_TP: Test transformer primary circuit breaker; ⑨ Low pressure MTr: SCOTT Transformer for low pressure; ⑩MCCB_TS: Low-voltage peripheral voltage circuit breaker (TSM, TST); ⑪ Low pressure CT: CT for low voltage current detection; ⑫MCCB_Fn: Low-voltage power supply circuit breaker (n=1,2,3,4); ⑬ Low voltage PT: PT for low voltage voltage detection; ⑭89FnL: low voltage power supply selection switch (n=1,2,3,4); ⑮ Connection: Connection of existing GIS bus and low voltage power cable;

Ground fault determination unit: Ground fault determination unit on the tram line;

HLTS (High-Low Transfer Switch, High-Low Voltage Transfer Switch): A device that selects PT, CT, and secondary voltage current of the high-low-voltage power supply system.

SMARCON: A device that executes procedures for sequentially controlling circuit breakers and switchgear for low voltage test, and exchanges data with other higher-level equipment.

For reference, among the terms used below, the low voltage will be defined to mean a voltage of AC 50V to 440V, which is relatively lower than the AC 27.5kV used for general catenary.

1 is a block diagram schematically showing the configuration of an apparatus for pre-determining the presence or absence of a ground fault on a low-voltage catenary line according to an embodiment of the present invention.

2 is an exemplary diagram of a power supply system for a device for pre-determining the presence or absence of a ground fault in a low-voltage catenary line according to an embodiment of the present invention.

Referring to Figure 2, first in the high-voltage power supply system, ① to the secondary of the switch (89FnM) for the high-voltage power supply bus ③ the primary of the high-voltage power supply circuit breaker (52Fn, n = 1, 2, 3, 4) is connected; ③ The secondary of the high-voltage power supply circuit breaker (52Fn, n=1,2,3,4) is connected to the primary of the ④high-voltage power supply line switch (89Fn, n=1,2,3,4); ④ High-voltage voltage detection PT (high-voltage PT) is connected in parallel to the secondary of the switch (89Fn, n=1,2,3,4) for high-voltage power supply lines; ④ The primary of the switch for high voltage feed AT (89ATn, n=1,2,3,4) is connected to the second of the switch for high voltage feed line (89Fn, n=1,2,3,4); ⑥ The secondary of the high-voltage power supply AT switch (89ATn, n=1,2,3,4) is connected to the primary of the ⑦ high-voltage power supply AT (ATn, n=1,2,3,4); ② CT (high voltage CT) for high voltage current detection is installed between the secondary of ① high-voltage power supply bus switch (89FnM) and ③ the primary of high-voltage power supply breaker (52Fn, n=1,2,3,4).

Next, in the low-voltage power supply system, an external power source of AC 380V is connected to the primary of the ⑧ test transformer primary circuit breaker (MCCB_TP); ⑧ The primary of the test transformer primary circuit breaker (MCCB_TP) is connected to the secondary of ⑨ low-voltage peripheral voltage (low-voltage MTr; SCOTT Transformer); ⑨ The primary of the secondary circuit breaker (MCCB_TS, TSM, TST) is connected to the secondary of the ⑨ low pressure peripheral voltage (low pressure MTr; SCOTT Transformer); ⑩ The primary of the low-voltage power supply circuit breaker (MCCB_Fn, n=1,2,3,4) is connected to the secondary of the secondary circuit breaker (MCCB_TS, TSM, TST) for low voltage; ⑫ In the secondary of the circuit breaker for low-voltage power supply (MCCB_Fn, n=1,2,3,4), ⑬ low-voltage voltage detection PT (low-voltage PT) is connected in parallel; ⑫ The primary of the low-voltage power supply selection switch (89FnL, n=1,2,3,4) is connected to the secondary of the ⑫low-voltage power supply circuit breaker (MCCB_Fn, n=1,2,3,4); ⑭ The secondary of the low voltage power selection switch (89FnL, n=1,2,3,4) is connected to the ⑮existing GIS bus and the low voltage power cable connection (connection).

And ⑩between the secondary of the secondary circuit breaker (MCCB_TS, TSM, TST) for low voltage and ⑫ the primary circuit breaker (MCCB_Fn, n=1,2,3,4) for low voltage supply ⑪CT for low voltage current detection ( Low pressure CT) is installed.

고저압 절체스위치(HLTS)의 CT입력단에 ②고압 전류검출용 CT(고압CT)와 ⑪저압 전류검출용 CT(저압CT)이 연결되고;

고저압 절체스위치(HLTS)의 PT입력단에 ⑤고압 전압검출용 PT(고압PT)와 ⑬저압 전압검출용 PT(저압PT)이 병렬연결되며;

고저압 절체스위치(HLTS)의 출력단에

지락판별부의 통신선은

SMARCON의 통신단자에 연결되며;

SMARCON의 제어에 의해

고저압 절체스위치(HLTS)를 구동(고압 또는 저압 선택)하게 된다. Also

② CT for high voltage current detection (high voltage CT) and ⑪ CT for low voltage current detection (low voltage CT) are connected to the CT input terminal of the high and low voltage transfer switch (HLTS);

⑤ high voltage voltage detection PT (high voltage PT) and ⑬ low voltage voltage detection PT (low voltage PT) are connected in parallel to the PT input terminal of the high and low voltage transfer switch (HLTS);

To the output terminal of the high and low voltage transfer switch (HLTS)

The communication line of the ground fault detection unit is

Connected to the communication terminal of SMARCON;

Under the control of SMARCON

It drives the high/low pressure transfer switch (HLTS) (selects high or low pressure).

Referring to FIG. 1, the preliminary determination of the presence or absence of a ground fault in a tram line according to the configuration as shown in FIG. 2 will be described below.

In other words, if ① the central processing unit control unit orders the selection of the power supply system for preliminary determination of ground faults, ② HLTS operates sequentially to select the low voltage power supply system, and ③ about the circuit breaker of the low voltage power supply system to supply low voltage to the tram line. If an ON (0n) control command is given, ④ check the Off status of 89FnM, 52Fn and 89Fn and On status of 89ATn, and ⑤ 89FnL→MCCB_TP→MCCB_TSM→MCCB_Fn are sequentially turned on in the low voltage power supply system ⑥ According to the presence or absence of a ground fault on the tram line, the ground fault voltage and current are input to the ground fault determination unit to determine whether there is a ground fault. ⑦ Central processing unit monitors the operation of the ground fault detection device in real time, and SCADA (Supervisory Control And Data Acquisition, remote monitoring control system).

It is natural that a monitor or an alarm sound generator can be included here.

On the other hand, the operation of the HLTS (high and low pressure transfer switch) will be described with reference to FIGS. 3 and 4 as follows.

In other words, ⓐ C1, C2, C6 are on, and C3, C4, and C5 are off, and when the central processing unit commands the selection of low-voltage power supply system, ⓑC5 is turned on. The high-pressure CT is short-circuited, ⓒC1 is turned off to separate the high-pressure CT, ⓓC2 is sequentially turned off, ⓔC4 is turned on, and the low-pressure PT is connected, and ⓕC3 is turned on. When the low voltage CT is connected to (On) and ⓖC6 is finally turned off and the low voltage CT opens the short circuit, the transfer is completed from the high voltage power supply system to the low voltage power supply system.

Here, the voltage and current of the low-voltage power supply system are input to the ground fault determination unit input device through the HLTS.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and other equivalent embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined only by the appended claims.

Claims (2)

In the high-voltage power supply system, a high-voltage power supply circuit breaker and a high-voltage power supply line switch are connected in series to the secondary of the high-voltage power supply bus switch, and a high-voltage voltage detection PT is connected in parallel to the secondary of the high-voltage power supply line switchgear. A high-voltage switch and a high-voltage power supply AT are connected in series, and a high-voltage current detection CT is installed between the secondary of the high-voltage power supply bus switch and the primary of the high-voltage power supply circuit breaker;
In the low voltage power supply system, an external power source of AC 380V is connected in series to the secondary circuit breaker of the test transformer primary circuit breaker, low voltage peripheral voltage and low voltage peripheral voltage, and 1 of the low voltage power supply circuit breaker to the secondary of the secondary circuit breaker of the low voltage peripheral voltage. The car is connected, and the PT for low voltage voltage detection is connected in parallel to the secondary of the circuit breaker for low voltage supply, the switch for selecting the low voltage power and the connection of the low voltage power cable are connected in series, and the secondary and low voltage supply of the secondary circuit breaker for the low voltage peripheral voltage A CT for low voltage current detection is installed between the primary of the dedicated circuit breaker, the high voltage current detection CT and the low voltage current detection CT are connected to the CT input terminal of the high/low voltage transfer switch, and the high voltage voltage detection at the PT input terminal of the high/low voltage transfer switch PT for low voltage voltage detection and PT for low voltage voltage detection are connected in parallel, the input terminal of the ground fault detection unit is connected to the output terminal of the high/low voltage transfer switch, and the ground fault detection unit connected to SMARCON allows the high/low voltage transfer switch to select high or low voltage under the control of SMARCON. Be composed;
The high/low voltage transfer switch keeps C1, C2, C6 on, and C3, C4, and C5 off when the high-voltage power supply system is in the off state, but C5 is turned on when the central processing unit commands the selection of the low-voltage power supply system. (On), the high pressure CT is short-circuited, C1 is off, the high pressure CT is separated, C2 is sequentially turned off, C4 is on, the low pressure PT is connected, and C3 is turned on ( A device for pre-determining the presence or absence of a ground fault in a low-voltage catenary line, characterized in that the transfer from the high-voltage power supply system to the low-voltage power supply system is completed when the low-voltage CT is connected and C6 is finally turned off and the low-voltage CT opens the short circuit. .
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