JP4221682B2 - Substation complementing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small-sized substation facility that relieves a voltage drop near the middle between existing substations in a railway.
[0002]
[Prior art]
In order for a train to perform electric operation, a train line that supplies electric power to an electric vehicle from a substation transformed into a form suitable for electric operation is necessary. A circuit that feeds electric vehicles from a substation via a train line is called a feeder system. The power transmission system is required to be able to smoothly supply power in response to a load of an electric vehicle that frequently changes while moving, and to have high reliability and conditions such as new installation or reduction of maintenance costs.
[0003]
In the feeder system, the rail is generally used as a return line. Moreover, since the current is large in the DC feeder system, a feeding method is adopted in which a feeder is provided in parallel with the trolley wire, and the feeder and the trolley wire are connected by a feeder branch wire. Furthermore, feeders are devised to reduce voltage drops due to loads on electric vehicles by connecting substations in parallel.
[0004]
In the conventional DC electrification section, every 10 km away, there is a substation that receives power from a special high voltage transmission line (usually 22,000-77,000V) of the power company, and the standard voltage is set to 1,500V. is doing. When power is supplied from a substation to a train load, a voltage drop occurs due to the resistance of a train line or rail that is a current path, so the voltage at the pantograph point where the train receives power greatly fluctuates. The magnitude of this voltage drop is represented by the product of resistance and current from Ohm's law. The resistance is determined by the material and thickness of the train track, and the distance from the substation to the load point, and the current is determined by the type of train and the number of trains. Therefore, the voltage drop becomes very large when a train with a large load current is powered near the middle between substations. When the voltage drop increases, operation becomes impossible due to the characteristics of the train control device.
[0005]
Therefore, conventionally, as a means for relieving the voltage drop due to the train load near the middle between such substations, a method of reducing the resistance of the train line by increasing the diameter of the feeder or increasing the number of feeders, and As shown in FIG. 2A, a countermeasure has been taken in that a substation 3 is newly installed near the middle between the existing substations 1 and 2. In the figure, reference numeral 4 denotes a train. Moreover, the thin line of FIG. (B) has shown the case where the voltage drop before installing the substation 3 has arisen, and the thick line has shown the case where the voltage drop after installing the substation 3 is relieved.
[0006]
[Problems to be solved by the invention]
However, when the diameter of the feeder line is increased or increased, the work is performed within a limited time between train operations, especially at midnight, resulting in poor work efficiency and a large construction cost and construction period. There was a drawback.
In addition, when the substation 3 is newly installed, the facility itself of the substation 3 is the same as that of the existing substation 1 even though the purpose is only to relieve the voltage drop near the middle between the existing substations 1 and 2. , 2 (standard voltage 1,500V, rectifier capacity 4,000Kw) is installed, and there is a drawback of requiring a large dedicated site, a large construction cost and construction period. there were.
[0007]
[Means for Solving the Problems]
The present invention is an improvement and removal in view of the above-described conventional problems, and is intended to provide a device capable of relieving a voltage drop near the middle between substations that is small in size and easy to install. Is.
[0008]
Therefore, the means of claim 1 adopted by the present invention to solve the above problem is a capacity provided near the middle between existing substations of a railway and capable of receiving power from a high-voltage distribution line. The set voltage when receiving power from a high-voltage distribution line that is different from the special high-voltage transmission line that the station receives and taking into account the degree of voltage drop so that train operation can be continued and is set lower than the standard voltage of the feeder line, the voltage of the feeder line at the installation location of the device is supplied to the wire side can the power of the set voltage when it is lower than the set voltage, the the voltage of the feeder line at the installation location of the device is a substation complementary apparatus characterized by complement so that the set voltage.
Thus, when the operating voltage (for example, 1,200 V) lower than the standard voltage (for example, 1,500 V) of the feeder is set and the voltage of the feeder becomes lower than the set voltage, the feeder side For example, a capacity of about 500 Kw is sufficient as long as it is a facility for supplying electric power to the apparatus, and the entire apparatus can be greatly reduced in size.
[0009]
Further, it is possible to receiving from 6,600V high-voltage distribution line of power companies, i.e. from the high-voltage distribution line for supplying to the household Ru can be powered, is not required special high wiring work is there.
[0010]
Means according to claim 2 in which the present invention is employed, it can accommodate devices all in outdoor cubicle, a substation complementary device according to claim 1, which is produced in advance factory.
Substation equipment can be miniaturized, so all of its components can be stored in outdoor cubicles, manufactured in advance at the factory, installed just by installing them on site, and no complicated wiring work is required. Yes, the construction period can be shortened and the cost can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of the present invention will be described below based on the embodiment of the invention shown in the drawings. FIG. 1 relates to an embodiment of the present invention. FIG. 1 (A) is a schematic diagram when a supplementary device 5 is installed between existing substations 1 and 2, and FIG. 1 (B) is a supplementary device. 5 is a characteristic diagram showing a voltage drop before and after installation of FIG . What is different in the components of the complementing device 5 and the existing substations 1 to 3 is that the set voltage for supplying power to the feeder line side is different. The voltage set for the supplementary device 5 to start supplying power to the feeder line side is a voltage lower than the standard voltage 1,500 V supplied to the feeder lines from the substations 1 to 3, for example, 1,200 V. is there. This set voltage is specifically determined by the degree of voltage drop at the place where the complementing device 5 is installed.
[0012]
Thus, by setting the setting voltage at which the complementing device 5 operates to 1,200 V, which is lower than the standard voltage 1,500 V of the substations 1 to 3, the substations 1 to 3 require a 4,000 Kw rectifier. However, the complementing device 5 may be a rectifier of 500 Kw, and the capacity of other substation equipment associated with the rectifier can be greatly reduced, and consequently reduced in size. In addition, the complementing device 5 can receive power from the power company from the 6,600 V high-voltage distribution line that is a high-voltage distribution line supplied to a general household. It is possible to receive power more easily than when receiving power from a special high voltage distribution line of 000-77,000V. In order to receive power from a 6,600 V high-voltage distribution line, the supply regulation stipulates that the amount of power used is 2,000 Kw or less. In other words, when receiving power from a 22,000-77,000 V special high-voltage distribution line as in the conventional substations 1 to 3, these special high-voltage distribution lines must be newly wired to the place where the power receiving facility is located. is required. However, in the case of the supplementary device 5, a high-voltage distribution line supplied to a general household can be used, and this high-voltage distribution line has already been installed in most places in the city area, and there is no need for special wiring work. .
[0013]
Furthermore, if the operating set voltage is 1,200V and the rectifier capacity is as small as about 500Kw, all of the substation equipment such as transformers and AC circuit breakers attached to these are reduced in capacity and size. Can be Therefore, the entire complementing device 5 can be divided into, for example, a high-voltage power receiving facility, a transformer / rectifier facility, and a DC feeder facility, and each facility can be housed and installed in each cubicle. The assembly assembled by wiring connection can be transported by truck and carried to the site with a crane or the like, and these can be connected and installed to complete the wiring connection work and its construction. Therefore, it is sufficient to perform on-site construction work, such as placing the foundation part into concrete, and subsequent transport, loading, and assembly work, which can greatly reduce the construction period and cost. is there. Moreover, the installation space for each of the substations 1 to 3 is approximately 600 m ² , whereas the supplementary device 5 may be approximately 20 m ² , and uses a small idle land such as a station. It is possible to install.
[0014]
As shown in FIG. 1B, the complementary device 5 installed in this manner has a voltage drop near the middle of the substations 1 and 2, and the voltage of the feeder line at the location where the complementary device 5 is installed is low. The operation starts only when the voltage becomes lower than 1,200V, and the supply of the voltage of 1,200V to the feeder is started. Therefore, a voltage of 1,200 V is ensured as the voltage of the feeder at the location where the complementing device 5 is installed . That is, the voltage drop near the middle of the substations 1 and 2 is complemented by the voltage of 1,200 V supplied by the complementing device 5 so as to relieve the minimum voltage drop without stopping the electric motor of the train 4. It is possible to continue driving.
[0015]
By the way, this invention is not limited to embodiment mentioned above, A suitable change is possible. For example, the installation distance between the substations 1 and 2 is made longer than the usual 10 km, and the complementary device 5 according to the present invention is installed at a location where a voltage drop occurs between them, so that the total substation It is also possible to reduce the number of installations and simplify the entire power supply facility. In addition, the set voltage at which the complementing device 5 operates is set to 1,200 V in the above-described embodiment, but this is a comprehensive measure of the actual voltage drop degree and degree of occurrence, train load, front and rear substation capacity, and the like. This should be set in consideration of the above.
[0016]
【The invention's effect】
As described above, in the present invention, when the voltage of the feeder line is lower than the set voltage near the middle between the existing substations of the railway, the power of the set voltage is supplied to the feeder line side. A small complementary device is provided to relieve the voltage drop near the middle between substations, so that the equipment constituting the complementary device can be reduced in capacity and size, such as a large site Is unnecessary. Further, since the thus configured small capacity and a small supplemental device, the high-voltage distribution line to be supplied to households can be supplied with power, erection work of special high-voltage distribution line is not necessary.
[0017]
Furthermore, in the present invention, since all the equipment of the complementary device can be stored in the outdoor cubicle, it is manufactured in advance in a factory, etc., and then it is carried to the site and suspended by a crane or the like and fixedly installed. Can be constructed with. Therefore, complicated wiring work or the like is unnecessary, and the construction period can be shortened and the cost can be reduced. For reference, if it is a supplementary device of the present invention, one month including the foundation work is sufficient, but when installing a conventional substation, a long work of about six months to one year is required. A period is required.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 relates to an embodiment of the present invention, in which FIG. (A) is a schematic diagram when a complementary device is installed between substations, and FIG. (B) is a voltage drop relief by the complementary device. It is a characteristic view which shows a measure.
FIG. 2 shows a conventional technique, where FIG. (A) is a schematic diagram when another substation is installed between substations, and FIG. (B) shows a remedy for voltage drop by substations. FIG.
[Explanation of symbols]
1-3 ... Substation 4 ... Train 5 ... Complementary equipment

Claims (2)

It is a device installed near the middle of existing substations in the railway, it has a capacity that can receive power from the high-voltage distribution lines, receives power from a high-voltage distribution line that is different from the special high-voltage transmission lines that the existing substation receives power, setting voltage at which the device supplies the power, in consideration of the degree of voltage drop as is possible to sustain the operation of the train, it is set lower than the standard voltage of the feeder line, the installation location of the apparatus voltage of the feeder line in is supplied to the wire side can the power of the set voltage when it is lower than the set voltage, the complementary voltage of the feeder line at the installation location of the device so that the set voltage Substation complementing device, characterized by   The substation complementing device according to claim 1, wherein all devices are housed in an outdoor cubicle and manufactured in advance in a factory or the like.

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