JPS6323936B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feeding distribution device for controlling the feeding distribution of overhead lines in an electric railway.

In electric railways, sections are installed at the parts of the overhead wires where the power is divided in order to separate the power from the feeder. It may occur that the section in question is short-circuited.
At this time, if there is an accident in the overhead wire in one feeder section of the section, a problem will arise in which the fault current will flow from the substation in the other unsound feeder section via this vehicle to the feeder section where the fault occurred. At the same time, power outages may occur even in healthy and warm power lines. In order to deal with this problem, a system is designed to prevent accidental current from flowing from a healthy feeder section to a faulty feeder section through the vehicle entering the section, whether it is in power running or regeneration mode. control is required.

FIG. 1 is a connection diagram of a conventional feeding distribution device having such a function. In Figure 1, 1,
2 and 3 are sections, through which overhead lines 4, 5, 6 and 7 are connected. 8 and 9 are feeder switches connected to overhead lines 4 and 7, 10 and 11
is a power source that supplies power to the overhead wires 4 and 7 via the switches 8 and 9, that is, a substation; 12 is a vehicle that receives power via the overhead wires 4 to 7; 13 and 14 are mounted on the vehicle 12;
While electrically contacting the overhead wires 4 to 7, the vehicle 12
These are pantographs that are interconnected within.
15 indicates the traveling direction of the vehicle 12.

Block 16 for controlling the power feeding of overhead lines 4 to 7
1 and 16-2 have the same configuration, so block 16-2
To explain 1, 17-1 and 18-1 are current transformers, and 19-1 and 20-1 are thyristors connected in parallel to section 1 to form a switch circuit, and their connection polarities are opposite to each other. , the currents I _1P and I _1B flowing when ignited are current transformers 17-1, 18
-1 changes the current. 21-1, 22-1 are connected to the output terminals of current transformers 17-1, 18-1, and the current
a detector that generates a signal that is “0” when I _1P and I _1B are zero, and “1” when they are not zero; 23-1;
24-1 is an ignition circuit that supplies gate signals to the thyristors 19-1 and 20-1. Note that block 16-2 corresponds to block 16-1 in which suffix code 1 is replaced with suffix code 2, and has the same function.

25 is a detector that is connected in parallel to section 2 and detects the voltage E ₂ across section 2;
When E ₂ is larger than a predetermined voltage value, "1" is generated regardless of its polarity; otherwise, "0" is generated.

26 is the detector 21-1, 21-2, 22-1,
Input the signals of 22-2 and 25, and start the ignition circuit 23.
This is a logic circuit that outputs control signals to -1, 23-2, 24-1, and 24-2, and has the function described in the following operation.

Next, the operation will be explained with reference to FIG.

a When the vehicle 12 does not exist between sections 1 and 2, or when the vehicle 12 passes by lowering the pantographs 13 and 14. In such a case, expressed as a logical formula, I _1P +I _1B +I _2P +I _2B +E ₂ =0.
From this condition, the logic circuit 26 is connected to the ignition circuit 23-
1 and 24-1, the thyristors 19-1 and 20-1 are fired, and the overhead wires 4 and 5 are electrically connected.

b. When the vehicle 12 is moving in a power running or elliptical state between sections 1 and 2. Thyristor 19-
1,19-2 are ignited, I _1P + I _2P = 1
becomes. In addition, when the vehicle 12 is in an elliptical state, I _1P = 1 or I _2P = 1 due to the auxiliary equipment load (not shown).
becomes.

c When a vehicle 12 in a regeneration state approaches between sections 1 and 2. Thyristor 20-1, 20
-2 is ignited, and I _1B + I _2B = 1.

d As in case a or b, thyristor 19-
2 and 20-2 are turned off and vehicle 12 enters between sections 2 and 3. In this case, E ₂ = 0 to E ₂ = 1, and thyristor 1
9-2 and 20-2 are fired.

e For cases other than a to d, thyristor 19-1, 1
9-2, 20-1 and 20-2 are turned off.

In the case of such a to e, pantograph 13,
Even if the section 3 is short-circuited by the vehicle 14 and the vehicle 12, the overhead wires 4 and 7 will not be short-circuited, that is, a section over will not occur.

However, in the above state a, if a ground fault occurs in the feeding section of the overhead line 4, the vehicle 12 raises the pantographs 13 and 14 in the section 3,
If the pantograph 13 contacts the overhead wire 5 and the pantograph 14 contacts the overhead wire 6, the detector 25
sets the signal to “1”. In response, the logic circuit 26 sends a signal to the firing circuits 23-2, 24-2 to fire the thyristors 19-2, 20-2. Therefore, a ground fault occurs from the substation 11 via the switch 9, the overhead wire 7, the thyristor 19-2, the overhead wire 6, the pantographs 14, 13, the overhead wire 5, the thyristor 20-1, the overhead wire 4, and the ground fault point of the overhead wire 4. Current flows.

In addition, when the vehicle 12 is traveling in the opposite direction of the arrow 15 in the section of the overhead wire 6 in regenerative operation, the above-mentioned operation c occurs. However, pantograph 13 is connected to overhead wire 5.
If the thyristor 19-2 is erroneously fired after contacting the ground fault current, a ground fault current flows along the same path as described above.

As mentioned above, conventional feeding sectioning devices have the disadvantage that when a ground fault occurs in the overhead wire in a certain feeding section, a ground fault current may flow between the substation of the unhealthy feeding section and the ground fault point. It was hot.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and provides an electrical sectioning device that can accurately respond to various accident conditions and control so that ground fault current does not flow due to section over. The purpose is to provide

Hereinafter, the present invention will be explained in detail with reference to the circuit diagram of FIG. 2 showing one embodiment of the present invention. In addition,
In FIG. 2, parts with the same reference numerals as those in FIG. 1 indicate the same parts, and repeated explanations will be omitted below. 27-1 and 27-2 are contacts, which are closed when the switches 8 and 9 are closed. 28
-1, 28-2 are converters that output signals that are "1" when the contacts 27-1, 27-2 are closed and "0" when they are open, 29-1, 29-2, 30- 1,
30-2 performs an AND operation between the signals of the converters 28-1 and 28-2 and the signal of the logic circuit 26, and sends the resulting signal to the ignition circuits 23-1, 23-2, 24-1,
This is an AND gate that supplies 24-2.

Next, the operation will be explained. When switch 8 is open, contact 27-1 is open and converter 28-1
The signal becomes “0” and the AND gate 29-
1, 30-1 is closed. Therefore, the thyristors 19-1 and 20-1 are off, and the switch 8 of the overhead line 4 is open, so that no power is supplied to the overhead line 4.

In other words, a ground fault occurs in the overhead line 4, and the switch 8
When thyristor 19-1,
Since 20-1 is also turned off, thyristor 19-
No ground fault current flows through 1 and 20-1.

It is clear that when the switch 9 is opened, the operation is explained in the same way as the switch 8.

Note that in the above embodiment, the AND gate 29-
1, 29-2, 30-1, 30-2 as logic circuit 2
Although it was provided separately from logic circuit 2, such a function is provided separately from logic circuit 2.
It may be provided within 6. In addition, although contacts 27-1 and 27-2 are opened in conjunction with switches 8 and 9, contact 2 only opens when switches 8 and 9 automatically trip.
7-1 and 27-2 may be left open.

As described above, according to the present invention, the thyristor connected to the section is turned off in response to the open state of the feeder switch, which prevents the occurrence of inconvenient phenomena such as section over. It has the effect of preventing

[Brief explanation of the drawing]

FIG. 1 is a connection diagram of a conventional feeding distribution device, and FIG. 2 is a connection diagram of a feeding distribution device according to an embodiment of the present invention. 1, 2, 3... Section, 4, 5, 6, 7... Overhead line, 8, 9... Switch, 10, 11... Substation, 19
-1, 19-2, 20-1, 20-2...thyristor, 21-1, 21-2, 22-1, 22-2,
25...Detector, 23-1, 23-2, 24-1,
24-2...Ignition circuit, 26...Logic circuit, 29-
1, 29-2, 30-1, 30-2...and gate. In addition, in the figures, the same reference numerals indicate the same parts.

Claims (1)

[Claims] 1. At least one section is provided in an intermediate section of sections connected in series via the first and second sections to form first and second feeding sections on the overhead line of an electric railway, and a first switch circuit connected in parallel to the section and turned on by a gate signal; a second switch circuit connected in parallel to the second section and turned on by a gate signal; A current detector detects the presence of current in the switch circuit, a voltage detector detects the presence of voltage in the second switch circuit, and the signals of the current detector and voltage detector are introduced into the first and second switch circuits. a logic circuit that generates a control signal for controlling turning on and off of a second switch circuit according to the state of a vehicle receiving electricity via the overhead wire; and a control signal from the logic circuit to turn on the switch circuit. an ignition circuit that outputs the gate signal in response to the signal, and an ignition circuit that is provided corresponding to the first and second feeding sections, feeds when the circuit is closed, and opens the circuit in response to an opening command or short circuit current. 1st
and a second switching circuit, when the corresponding first and second switching circuits are open, an ON control signal of the switch circuit is sent from the logic circuit to the ignition circuit. A feeding distribution device characterized by comprising first and second logic circuits for inhibiting supply.