JPH0466735B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feeding distribution device for electric railways in which direct current feeding is performed.

FIG. 1 shows an example of a conventional electric railway feeder separation device. In Figure 1, SS ₁ and SS ₂
are two DC substations adjacent to each other. The positive output end of the substation SS ₁ is connected to the feeder line 1a, and the positive output end of the substation SS ₂ is connected to the feeder line 1d. A feeder wire 1b is provided in series with the feeder wire 1a via a section 2a, and a feeder wire 1c is provided in series with the feeder wire 1d via a section 2c. The feeder line 1b and the electric wire 1c are connected in series via a section 2b. 3a is a thyristor whose cathode side is connected to the feeder line 1a and whose anode side is connected to the feeder line 1b. A thyristor 3b having the illustrated polarity is connected in parallel between the anode and cathode of the thyristor 3a. 3c is a thyristor whose cathode side is connected to the feeder line 1c and whose anode side is connected to the feeder line 1d. Between the anode and cathode of this thyristor 3c is a thyristor 3d with the polarity shown.
are connected in parallel. 7a to 7d are current transformers for detecting the currents flowing through the thyristors 3a to 3d, respectively. Reference numeral 4 denotes an electric car, which has pantographs 5a and 5b electrically connected to each other inside. The negative output ends of the substations SS ₁ and SS ₂ are connected to the rail 6 . In the device configured in this way, the electric car 4 is connected from the substation SS ₁ to the substation
Assume that the vehicle is moving toward SS ₂ , that both thyristors 3a and 3b are in an on state, and that thyristors 3c and 3d are both in an off state. Electric car 4 has now moved to section 2a, and pantograph 5
The pantograph 5b connects the electric wire 1 to the electric wire 1a that is connected to the pantograph a.
Suppose that each person touches b. At this time, when the electric car 4 is performing power running operation, electric power is supplied to the electric car 4 from the substation SS ₁ via the feeder line 1a, and from the substation SS ₁ to the feeder line 1a, the thyristor 3b, and the feeder line. Power is supplied via 1b. At this time, the powering current flowing through the thyristor 3b is detected by the current transformer 7b. Then, a control signal is sent to the thyristor 3a and the thyristor 3c from a control circuit (not shown) provided on the secondary side of the current transformer 7b, and this control signal turns off the thyristor 3a and turns on the thyristor 3c. . Further, when the electric car 4 is performing regenerative operation, the regenerated power of the electric car 4 is regenerated to the substation SS ₁ via the feeder line 1a, and the feeder line 1b,
Substation via thyristor 3a and feeder line 1a
Regenerated into SS ₁ . At this time, the regenerative current flowing through the thyristor 3a is detected by the current transformer 7a. Then, a control signal is sent to the thyristor 3b and thyristor 3d from a control circuit (not shown) provided on the secondary side of the current transformer 7a, and this control signal turns off the thyristor 3b and turns on the thyristor 3d. . As described above, in the device shown in FIG.
Since the thyristors 3a to 3d are turned on or off depending on the operating state based on the d, the control operation is very complicated. Further, in the device shown in FIG. 1, the pantograph 5 of the electric car 4
If there is a potential difference between the voltages supplied from substations SS 1 and SS 2 when substations SS ₁ and SS ₂ cross section 2b as shown in the figure, electric car 4 crosses section 2b.
When passing through section 2b, an arc occurs,
This arc had the disadvantage of damaging the section 2b and the pantographs 5a, 5b. For example, there is a potential difference such that the power supply voltage E ₁ of the substation SS ₁ is 1300V and the power supply voltage _{E 2} of the substation SS 2 is 1500V, and the electric car 4 moves from the illustrated position to the substation SS ₁ side again and the pantograph 5b When passing through section 2b, an arc is generated in section 2b at that moment, and this arc damages section 2b and pantographs 5a and 5b.
Furthermore, the apparatus shown in FIG.
Due to the provision of thyristors a, 2b, and 2c, and the provision of four thyristors 3a to 3d,
There were drawbacks such as the overall complexity of the device, reduced reliability, and an increase in device cost.

The present invention was made in view of the above points, and not only simplifies the configuration of the device and improves reliability,
A feeder section for electric railways that can reliably supply or regenerate power depending on the operating status of electric cars, and that does not cause arcing in sections even if there is a large potential difference between adjacent substations. The purpose is to provide equipment.

The configuration of the present invention includes a first feeder line connected to the DC output side of a first substation, and a second feeder line connected to the DC output side of a second substation provided adjacent to the first substation. a feeder line, the first feeder line and the second feeder line;
A third feeder wire provided between the feeder wires is divided by a section, and a diode is bridge-connected, one input terminal being connected to the first feeder wire, and the other input terminal being connected to the first feeder wire. A first bridge circuit connected to a third feeder line and a diode are bridge-connected, one input terminal being connected to the third feeder line, and the other input terminal being connected to the second feeder line. a second bridge circuit, a first switching control element connected between the positive and negative output terminals of the first bridge circuit, a second switching control element connected between the positive and negative output terminals of the second bridge circuit, and an anode; a first Zener diode connected to the control terminal of the first switching control element and having a cathode connected to the positive output terminal of the first bridge circuit; and an anode connected to the control terminal of the second switching control element. and a second Zener diode having a cathode connected to the positive output terminal of the second bridge circuit.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, the same parts as in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted. The positive output end of the DC substation SS ₁ is connected to the feeder line 11a. A feeder wire 11b is connected in series to the feeder wire 11a via a section 12a that divides the feeder wire. At this time, section 1 is attached to wire 11b.
A feeder wire 11c is provided in series via 2b. This feeder line 11c is connected to the positive output end of the DC substation _SS2 . 13 is a diode 14
This is a first bridge circuit in which diodes 15a, 14b and diodes 15a, 15b are bridge-connected as shown. One end of the input side of this bridge circuit 13 is connected to the feeder line 11a, and the other end of the input side is connected to the feeder line 11b. One end of the output side of the bridge circuit 13 is connected to the anode of a switching control element, for example, a first thyristor 16a, and the other end of the output side is connected to the cathode of the thyristor 16a. Reference numeral 18 denotes a second bridge circuit in which diodes 19a, 19b and diodes 20a, 20b are bridge-connected as shown. One end of the input side of this bridge circuit 18 is connected to the feeder line 11b, and the other end of the input side is connected to the feeder line 11c. One end of the output side of the bridge circuit 18 is connected to a switching control element, for example, the anode of the second thyristor 16b, and the other end of the output side is connected to the cathode of the second thyristor 16b. The gate of the first thyristor 16a is a first Zener diode 21a.
connected to the anode of the The cathode of the first Zener diode 21a is connected to the anode of the first thyristor 16a via a resistor 22a. The gate of the second thyristor 16b is connected to the anode of the second Zener diode 21b. The cathode of the second Zener diode 21b is connected to the anode of the second thyristor 16b via a resistor 22b.

Next, the operation of the apparatus configured as described above will be described. First, a case will be described in which the electric vehicle 4 is moving from the DC substation SS ₁ to the DC substation SS ₂ while performing power running. Here, the thyristor 16a,
16b are both in the off state. Assuming that the electric car 4 is present under the feeder line 11a, power is directly supplied to the electric car 4 from the substation _SS1 . Next, the electric car 4 moves to the section 12a, and for example, as shown in the figure, the pantograph 5a connects to the feeder line 11a, and the pantograph 5b connects to the feeder line 11a.
Suppose that each person touches b. In this case, the first thyristor 16a is connected between the anode and gate of the first thyristor 16a.
The reverse voltage applied to the Zener diode 21a increases. When this voltage reaches the breakdown voltage of the first Zener diode 21a, an ignition current flows through the Zener diode 21a to the gate of the first thyristor 16a. As a result, the first thyristor 16a is turned on, so power is supplied to the electric car 4 from the substation SS ₁ via the feeder line 11a, and from the substation SS ₁ to the feeder line 11a, the diode 15b, and the first thyristor. 16
Power is supplied via the diode 15a and the feeder line 11b. In this case, the second thyristor 1
Since substation SS 6b remains off, power is not supplied from substation SS ₂ to electric car 4. Therefore, even if there is a potential difference between the voltages supplied from the substations SS ₁ and SS ₂ , no arc occurs in the section 12a. Next, if the electric car 4 moves to the substation SS ₂ side and is located under the feeder line 11b, the electric car 4 is connected to the substation SS ₁ via the feeder line 11a, the diode 15b, the first thyristor 16a, and the diode 15a. Power is supplied. Next electric car 4
Assume that the pantograph 5a moves to the section 12b and, for example, the pantograph 5a contacts the feeder line 11b, and the pantograph 5b contacts the feeder line 11c. In this case, the reverse voltage applied to the second Zener diode 21b connected between the anode and gate of the second thyristor 16b increases. When this voltage reaches the breakdown voltage of the second Zener diode 21b, an ignition current flows through the Zener diode 21b to the gate of the second thyristor 16b. As a result, the second thyristor 16b is turned on, so that the electric car 4 is connected from the substation SS ₁ to the feeder line 11a, the diode 15b, and the first thyristor 16.
Power is supplied via the diode 15a and the feeder line 11b, and the feeder line 11c, the diode _20b , and the second thyristor 1 are supplied from the substation SS2.
Power is supplied through 6b and diode 20a. Further, if the electric car 4 moves to the substation SS ₂ side and is located under the electric wire 11c, electric power is directly supplied to the electric car 4 from the substation SS ₂ .
At this time, the current flowing through the first thyristor 16a becomes zero, so the first thyristor 16a is turned off. Therefore, since no power is supplied from substation SS ₁ , no arc occurs in section 12b. When the electric car 4 performs power running as described above, power can be reliably supplied no matter where the electric car 4 is located under the feeder line or section, and at the same time, the electric car 4 can reliably supply power to the DC substations SS ₁ and SS _{2 .} Even if there is a potential difference between them, no arc will occur in the section. Furthermore, electric car 4 moves from DC substation SS ₂ to DC substation
When moving to the SS ₁ side, the same operation as described above is performed and the same effect can be obtained.

Next, electric car 4 moves from DC substation SS ₁ to DC substation
We will explain the case where the vehicle is moving to the SS ₂ side while performing regenerative operation. Here, the thyristors 16a, 16
It is assumed that both b are in the off state. Electric car now 4
If the electric car 4 is located under the power line 11a, the regenerated power of the electric car 4 is directly regenerated to the substation _SS1 . Next, the electric car 4 moves to the section 12a, and for example, as shown in the figure, pantographs 5a and 5b sandwich the section 12a with electric wires 11a and 11b.
Suppose that there is a short circuit between the two. In this case, the first thyristor 1
The reverse voltage applied to the first Zener diode 21a connected between the anode and gate of 6a increases. When this voltage reaches the breakdown voltage of the first Zener diode 21a, the first thyristor 16 is connected via the Zener diode 21a.
An ignition current flows through the gate of a. This turns on the first thyristor 16a. Also, at this time, the regenerative voltage of the electric car 4 is applied to the second Zener diode 21b via the feeder line 11b, the diode 19a, and the resistor 22b. When this voltage reaches the breakdown voltage of the second Zener diode 21b, an ignition current flows through the Zener diode 21b to the gate of the second thyristor 16b. This turns on the second thyristor 16b.
In this way, the first and second thyristors 16a, 1
6b are both turned on, the regenerated power of the electric car 4 is directly regenerated to the substation SS ₁ via the feeder line 11a, and the diode 14a and the thyristor 1
6a, diode 14b and feeder line 11a to substation SS ₁ , and further feeder line 11
b, substation via diode 19a, thyristor 16b, diode 19b and feeder line 11c
Regenerated to SS ₂ . Next, if the electric car 4 moves to the substation SS ₂ side and is located under the electric wire 11b,
The regenerated power of the electric car 4 is regenerated to the substation SS ₁ via the diode 14a, the first thyristor 16a, the diode 14b, and the feeder line 11a, and is also transformed via the diode 19a, the thyristor 16b, the diode 19b, and the feeder line 11c. place
Regenerated to SS ₂ . Next, electric car 4 is section 1
Move to part 2b, for example pantograph 5
a, 5b sandwich the section 12b and the electric wire 11
Suppose that b and 11c are short-circuited. Then electric car 4
The regenerative power is directly connected to the substation via the feeder line 11c.
It is regenerated to SS ₂ , and is also regenerated to substation SS ₂ via diode 19a, thyristor 16b, diode 19b, and feeder line 11c, and is further regenerated by feeder line 11b, diode 14a, and thyristor 16.
a, is regenerated to substation SS ₁ via diode 14b and feeder line 11a. Next, if the electric car 4 moves to the substation SS ₂ side and is located under the electric wire 11c, the regenerative power of this electric car 4 will be directly transmitted to the substation SS 2.
Regenerated to SS ₂ . At this time, the first thyristor 16
Since the current flowing through a becomes zero, the first thyristor 16a is extinguished. Therefore, no arc occurs in section 12b because no power is regenerated to substation SS ₁ .

When the electric car 4 performs regenerative operation as described above, power regeneration is reliably performed no matter which feeder line or section the electric car 4 is located on, and the potential difference between the DC substations SS ₁ and SS ₂ is reduced. Even if there is, no arc will occur in the section. Incidentally, when the electric car 4 moves from the DC substation SS ₂ to the DC substation SS ₁ side, the same operation as described above is performed and the same effect can be obtained. Further, the switching control element is not limited to a thyristor, but other elements having similar functions may be used.

As described above, according to the present invention, a switching control element is connected via a bridge circuit composed of a diode between the electric wires sandwiching the section, and a Zener diode is connected to the control terminal of the switching control element. The switching control element is configured so that it automatically turns on when the Zener diode reaches its breakdown voltage, and is used to detect the operating status of an electric vehicle and forcibly turn the switch on or off. This eliminates the need for operation and also eliminates the need for a power supply device or the like for control. Even if there is a potential difference between adjacent substations, no arc will occur in the section when an electric car passes through the section. Therefore, it is possible to prevent the pantograph wire from being damaged by arc. Furthermore, since a diode bridge circuit is provided in the electrical path connecting the two feeder wires that sandwich the section, the number of switching control elements is only two, thereby reducing the cost of the entire device. Further, since only two sections are required between adjacent substations, the entire device is simplified, reliability is improved, and the cost of the entire device is reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a conventional electric railway feeding distribution device, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. SS ₁ , SS ₂ ...DC substation, 11a, 11b,
11c... Feeder wire, 12a, 12b... Section, 13, 18... Bridge circuit, 14a, 14
b, 15a, 15b, 19a, 19b, 20a,
20b...diode, 16a, 16b...thyristor, 21a, 21b...Zener diode.

Claims (1)

[Scope of Claims] 1. A first feeder line connected to the DC output side of the first substation, and a first feeder line connected to the DC output side of a second substation provided adjacent to the first substation. A second feeder wire, a third feeder wire separated by a section between the first feeder wire and the second feeder wire, and a diode are bridge-connected, and one input terminal is connected to the third feeder wire by a section. A first bridge circuit is connected to the first feeder line and the other input terminal is connected to the third feeder line, and a diode is bridge-connected, and one input terminal is connected to the third feeder line. a second bridge circuit whose other input terminal is connected to the second feeder; a first switching control element connected between the positive and negative output terminals of the first bridge circuit; and a positive and negative output of the second bridge circuit. a second switching control element connected between the ends; and a second switching control element connected to each switching control element when the panda graph of the electric car is located in each section between the first and third feeder wires and between the third and second feeder wires. A feeder separation device for an electric railway, characterized in that it is equipped with voltage detection means for controlling each control element separately. 2. The feeding distribution device for electric railways according to claim 1, wherein the first and second switching control elements are comprised of thyristors.