JP2008271739A - Distribution system switching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a distribution system switching device in which a distribution system can be switched during short time power interruption and which is made small in size and inexpensive in cost by common use of a semiconductor switch. <P>SOLUTION: In the distribution system switching device, a plurality of feeders 21L, 22L, 12L, 11L are respectively connected to DC bus-bars 1, 3 of substations on fixed position and opposite position sides via breakers VCB 1 through VCB8 and disconnectors DS1 through DS8, the feeders 21L, 22L, 12L, 11L on the fixed position side and the feeders 21L, 22L, 12L, 11L on the opposite position side are connected via feeder lines 5, 6, the DC bus-bars 1, 3 on the fixed position and opposite position sides are connected to the respective feeders 21L, 22L, 12L, 11L via the common semiconductor switches 7, 8, and the respective switching units LBS1 through LBS8, and power supplies of the feeder lines are successively switched by opening/closing of the breakers VCB1 through VCB8 and the disconnectors DS1 through DS8 and also by opening/closing of the semiconductor switches 7, 8 and the switching units LBS1 through LBS8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a distribution system switching device that performs power supply switching and the like of a substation distribution system for electric railways at high speed to prevent a power failure.

  FIG. 3 shows the configuration of a conventional power distribution switching device for an electric railway substation when power is switched. 1 is a 6 kV DC bus connected to an AC power source 2 of a localization A substation via a rectifier (not shown). Reference numeral 3 denotes a 6 kV DC bus connected to the AC power source 4 of the reverse B substation via a rectifier (not shown), and the DC buses 1 and 3 face each other between adjacent substations. The DC bus 1 is connected to the A substation side feeders 21L, 22L, 12L, and 11L via the circuit breakers VCB1 to VCB4 and the disconnectors DS1 to DS4, respectively, and the DC bus 3 is connected to the circuit breakers VCB5 to VCB8 and the disconnection. The feeder lines 21L, 22L, 12L, and 11L on the B substation side are connected through the devices DS5 to DS8, respectively. The feeders 11L and 21L are connected via a feeder line 5 of No. 1, and the feeders 12L and 22L are connected via a feeder line 6 of No. 2 and the feeders of No. 1 and No. 2 are connected. Lines 5 and 6 are connected to feeder circuits. In addition, instrument transformers PT1 to PT8 are connected to the feeder lines 21L, 22L, 12L, and 11L on the A substation side and the B substation side, respectively, for capturing information necessary for measurement and control. The feeder lines 21L and 22L of the A substation and the feeder lines 11L and 12L of the B substation are connected to other adjacent substations and feeders of other sections.

  In the above configuration, the circuit breakers VCB3 and VCB4 and the disconnecting devices DS3 and DS4 are turned on in a steady state, the feeders 11L and 12L on the A substation side are turned on, and the feeders 21L and 22L on the B substation side are on standby. State. The standby state refers to a state in which the circuit breaker is not turned on due to a voltage on the feeder lines 5 and 6 although receiving the turn-on command. However, since the closing command is stored, the circuit breaker is automatically switched on when the voltage on the feeder lines 5 and 6 is lost. Accordingly, during normal operation, power is supplied to the feeder lines 5 and 6 from the power source on the A substation side. Here, when the power supply is stopped due to a work blackout or the like of the localization A substation, the power lines 5 and 6 are supplied with power from the power supply on the reverse B substation side. The switching procedure is as follows. (1) The circuit breaker VCB4 and the disconnecting switch DS4 are cut off, and the feeder line 11L on the A substation side is cut off. (2) The circuit breaker VCB5 and the disconnector DS5 are switched from the standby state to the charged state, the feeder line 21L on the B substation side is switched on, and the power source of the No. 1 feeder line 5 is switched from the A substation side to the B substation side. Switch to. Similarly, the procedure for switching the power source of No. 2 feeder 6 is as follows. (1) The circuit breaker VCB3 and the disconnecting switch DS3 are disconnected, and the feeder line 12L on the A substation side is brought into a disconnected state. (2) The circuit breaker VCB6 and the disconnecting switch DS6 are switched from the standby state, the feeder line 22L on the B substation side is switched on, and the power supply of the No. 2 feeder line 6 is switched from the A substation side to the B substation side. Switch to. When power is returned from the B substation side to the A substation side, the operation reverse to the above is performed.

  FIG. 4 shows the configuration of a conventional distribution system switching device for a railway substation at the time of section stop and power recovery operation. PAS1 and PAS2 are section switches provided in the feeder line 5 of No. 1. First, in the section stop operation, the initial state is the same as the steady state, the circuit breakers VCB3 and VCB4 and the disconnecting devices DS3 and DS4 are turned on, and the feeders 11L and 12L on the A substation side are turned on. The feeders 21L and 22L on the substation side are set in a standby state. Further, the section switches PAS1 and PAS2 are turned on. In this state, power is supplied from the A substation side to all sections of feeder lines 5 and 6 of No. 1 and No. 2. Here, the operation procedure for making a power failure between the section switches PAS1 and PAS2 will be described. (1) The section switch PAS2 is shut off. (2) The circuit breaker VCB5 and the disconnector DS5 are switched from the standby state to the input state, and the feeder line 21L on the B substation side is set to the input state. (3) The section switch PAS1 is turned off, and the feeder line 5 between the section switches PAS1 and PAS2 is set as the power failure section. The procedure for restoring the feeder line 5 between the section switches PAS1 and PAS2 is as follows: (1) The circuit breaker VCB5 and disconnector DS5 are shut off, and the feeder line 21L on the B substation side is shut off. . (2) Turn on the section switch PAS1. (3) Turn on the section switch PAS2 and restore power during this period.

  These series of distribution system switching operations are automatically performed by standard interlocking, but a power outage of about 1 to 2 seconds occurs.

Patent Document 1 describes a DC feeding system using a GTO circuit breaker composed of semiconductor switches. Patent Document 2 provides a stationary switch (semiconductor switch) in parallel with a circuit breaker. Describes a high-speed power supply switching device that conducts a static switch of a standby power supply when a zero-phase voltage is generated when the power supply circuit breaker is opened, turns off the static switch after the standby power supply circuit breaker is turned on, and switches the power supply at high speed ing.
JP-A-8-310278 JP-A-6-189470

  As described above, switching of the current 6 kV distribution system is a system that involves a short interruption of power. Conventionally, if the system is switched with the time when there is no train between the distribution systems, There was no problem even if the signaling system stopped. Moreover, also about the section power failure which interrupts a part of distribution line, in the conventional equipment structure, in order to return a distribution system to a localization, it is in the state which must take a power failure for a short time and to switch once. However, recently, the operation density of trains has increased, and it has become impossible to take time for switching with a power failure. At stations in the Tokyo metropolitan area, etc., power is also supplied to commercial facilities in the station from the power distribution system that was previously used only for direct business of the station. Even after the rear station is closed, power outages in the station are not allowed even for a short time. For this reason, it is impossible to easily stop the DC feeder substation as in the past, and this also causes a problem in periodic maintenance and inspection work.

  In the case of Patent Document 1, since a plurality of GTO circuit breakers are used, the power supply is switched instantaneously, but the cost of the equipment increases. In the case of Patent Document 2, since the energization time of the static switch is extremely short, the energization load is small, and the static switch can be made small and inexpensive. However, even if the techniques shown in FIGS. 3 and 4 and the techniques shown in Patent Documents 1 and 2 are combined, a plurality of mechanical circuit breakers and a plurality of small static switches are required. As a result, the cost was high and the installation space was large.

  The present invention has been made to solve the above-mentioned problems, and it is possible to switch the distribution system in a short power failure time, and to reduce the size and cost by sharing a high-speed semiconductor switch. The purpose is to obtain a system switching device.

  The distribution system switching device according to claim 1 of the present invention connects a plurality of feeders via a circuit breaker and a disconnector to a DC bus of a localization substation, and connects to a DC bus of an inverted substation. In a distribution system switching device in which a plurality of feeders are connected via a circuit breaker and disconnector, and a feeder on the localization side and a feeder on the opposite side are connected via a feeder line, respectively, a DC bus on the localization side Are connected to each other via a common semiconductor switch and each switching switch connected in series with this semiconductor switch, and between the DC bus and each feeder on the opposite side. Connected via a semiconductor switch and each switching switch connected in series with this semiconductor switch, the circuit breaker, disconnect switch open / close switch, switching switch, and switching of the power line of the feeder line by switching the semiconductor switch in sequence To do One in which the.

  The distribution system switching device according to claim 2 is configured to connect a plurality of feeders via a circuit breaker and a disconnector to a DC bus of a localization-side substation, and to connect a circuit breaker to a DC bus of an inversion-side substation. In a distribution system switching device in which a plurality of feeders are connected via a disconnector, and a feeder on the localization side and a feeder on the opposite side are connected via a feeder line, the DC bus and each A common semiconductor switch is connected between the wires and each semiconductor switch and each switching switch connected in series, and a common semiconductor switch is connected between the DC bus and each feeder on the opposite side. Connected via each switch connected in series with this semiconductor switch, and provided with section switches at both ends of the power outage section of the feeder line, circuit breaker, switch open / close switch, switch switch, semiconductor Switch opening and closing The opening and closing of the partial switches is obtained to perform the power failure and power restoration blackout interval.

  As described above, according to the first aspect of the present invention, a plurality of feeders are connected to the DC buses of the substations on the localization side and the reverse side via the circuit breakers and disconnectors, respectively, Are connected in series with a common semiconductor switch and this semiconductor switch between the DC bus on the localization side and the reverse side and each feeder line. The power supply of the feeder line is switched from the localized side to the inverted side or from the inverted side to the localized side by opening and closing the circuit breaker, disconnector and semiconductor switch and switching switch. Since it is only necessary to respond to planned power outages at substations, it is not necessary to switch all feeder lines at once, and it is only necessary to sequentially switch feeder lines. By doing a replacement , The power supply switching can be carried out by a brief power outage time of the order of a few ms, you are possible to eliminate the influence of the load equipment. Further, by using a switching switch for line selection, high-speed switching can be realized by having only one set of semiconductor switches, and high-speed switching can be realized at low cost and in a small size.

  According to claim 2, a plurality of feeders are connected to the DC buses of the localization side and the inversion side substations through the circuit breakers and disconnectors, respectively, and the localization side feeder and the inversion side are connected. Each switch is connected to a feeder line via a feeder line, and a common semiconductor switch and each switch are connected in series between the DC bus on the localization side and the opposite side and each feeder line. Power supply in the power outage section by installing a section switch at both ends of the power outage section of the feed line, and opening / closing the circuit breaker, disconnector, semiconductor switch, switching switch, and section switch In the case of power failure and power recovery for distribution line work or the like, these operations can be performed without causing a power failure in a section other than the power failure section. Further, by using a switching switch for line selection, high-speed switching can be realized by having only one set of semiconductor switches, and high-speed switching can be realized at low cost and in a small size.

Best Embodiment 1
The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of the distribution system switching device according to the first embodiment of the present invention at the time of power switching operation. Circuit breakers VCB1 to VCB4 and disconnecting switches DS1 to DS4 are connected to a 6 kV DC bus 1 of the A substation on the localization side. 21L, 22L, 12L, and 11L are connected to each other, and each feeder 21L is connected to the 6 kV DC bus 3 of the reverse B substation via the circuit breakers VCB5 to VCB8 and disconnectors DS5 to DS8. , 22L, 12L, and 11L are connected to each other, and each feeder 21L, 22L, 12L, and 11L on the localization side and each feeder 21L, 22L, 12L, and 11L on the opposite side are connected to No. 1 and No. 2 feeders. 5 and 6, and the feeder lines 5 and 6 are connected to feeder circuits for supplying power to each electric vehicle. Further, a common semiconductor switch 7 is connected between the localization-side DC bus 1 and the localization-side feeders 21L, 22L, 12L, 11L, and motor-operated switching switches connected in series with the semiconductor switch 7, respectively. In addition to being connected via LBS1 to LBS4, a common semiconductor switch 8 and the semiconductor switch 8 are connected in series between the reverse-side DC bus 3 and the reverse-side feeders 21L, 22L, 12L, and 11L. The connection is made via each connected motor-driven switching switch LBS5 to LBS8.

  In the above configuration, during normal operation, the circuit breakers VCB3 and VCB4 and the disconnecting devices DS3 and DS4 are turned on, the feeder lines 11L and 12L on the A substation side are turned on, and the feeder lines 21L and 22L on the B substation side are on standby. State. Accordingly, during normal operation, power is supplied to the feeder lines 5 and 6 from the A substation side. Here, when switching the power source of No. 1 feeder line 5 from the A substation side to the B substation side, the following procedure is performed. (1) First, the switching switch LBS5 on the B substation side is closed. (2) The circuit breaker VCB4 and the disconnect switch DS4 on the A substation side are cut off and the electric wire 11L is cut off. (3) The semiconductor switch 8 on the B substation side is turned on, and the feeder line 5 of No. 1 is pressurized by the power source on the B substation side within a few ms. (4) The circuit breaker VCB5 and the disconnecting switch DS5 are turned on from the standby state, and the feeder line 21L on the B substation side is turned on. (5) The semiconductor switch 8 is turned off. (6) Open the switching switch LBS5 on the B substation side. Thereby, the power supply of No. 1 feeder line 5 is switched from the A substation side to the B substation side. When switching the power source of the feeder line 6 of No. 2 from the A substation side to the B substation side, (1) the switching switch LBS6 is closed. (2) The circuit breaker VCB3 and the disconnector DS3 are disconnected and the electric wire 12L is disconnected. (3) The semiconductor switch 8 on the B substation side is turned on, and the feeder line 6 of No. 2 is pressurized by the power source on the B substation side within a few ms. (4) The circuit breaker VCB6 and the disconnecting switch DS6 are turned on from the standby state, and the feeder line 22L on the B substation side is turned on. (5) The semiconductor switch 8 is turned off. (6) Open the switching switch LBS6 on the B substation side. Thereby, the power supply of No. 2 feeder 6 is switched from the A substation side to the B substation side. When the power source is returned from the B substation side to the A substation side, an operation reverse to the above may be performed.

  In the first embodiment, by switching the load by opening and closing the semiconductor switches 7 and 8, it is possible to switch the power supply in a power failure time of about 5 ms, without worrying about the time between trains. The power supply can be switched at any time without worrying about the load equipment. Further, by providing the switching switches LBS1 to LBS8 for line selection, the semiconductor switches 7 and 8 can be shared, and by providing only one set of the semiconductor switches 7 and 8, the power supply can be switched at high speed. Can be realized in a small and inexpensive manner. Furthermore, an uninterruptible power supply (UPS), which has been conventionally provided as a power failure countermeasure at the time of system switching, in the important load facility of the station becomes unnecessary.

Embodiment 2
FIG. 2 shows a configuration of a section switching and power recovery operation of a distribution system switching device of a railway substation according to Embodiment 2 of the present invention. PAS1 and PAS2 are located at both ends of a power outage section of No. 1 feeder line 5. It is the provided division switch, and the other structure is the same as that of the first embodiment. First, at the time of the section stop operation, the initial state is the same as the steady state, the circuit breakers VCB3 and VCB4 and the disconnecting devices DS3 and DS4 are turned on, and the feeders 11L and 12L on the A substation side are turned on. The feeders 21L and 22L on the substation side are set in a standby state. Further, the section switches PAS1 and PAS2 are turned on. In this state, power is supplied from the A substation to all sections of No. 1 and No. 2 feeder lines 5 and 6. Here, in order to make a power failure between the section switches PAS1 and PAS2 of the No. 1 feeder line 5 for distribution line work and the like, the following procedure is used. (1) First, the switching switch LBS5 on the B substation side is closed. (2) Next, the section switch PAS2 is opened. (3) The semiconductor switch 8 on the B substation side is turned on, and within a few ms, the power from the B substation side to the section switch PAS2 of the feeder line 5 of No. 1 is pressurized by the power source on the B substation side. (4) The circuit breaker VCB5 and the disconnecting device DS5 are turned on from the standby state, and the feeder line 21L on the B substation side is turned on. (5) The semiconductor switch 8 is turned off. (6) The section switch PAS1 is opened. (7) Open the switching switch LBS5.

  Next, at the time of power recovery operation, (1) First, the switching switch LBS5 on the B substation side is closed. (2) Turn on the semiconductor switch 8 on the B substation side. (3) The circuit breaker VCB5 and the disconnector DS5 are disconnected. (4) Turn on the section switch PAS1. (5) Turn on the section switch PAS2. (6) The feeder line 5 of No. 1 is fed in parallel from the A substation and the B substation, and a cross current flows. This is detected by a detection means (not shown) and the semiconductor switch 8 is turned off (if a cross current is not detected, it is necessary to turn it off as a command). (7) The feeder line 21L of the B substation is put into a standby state by being handled. (8) Open the switching switch LBS5 of the B substation. Of course, a power failure and power recovery operation can be performed using the semiconductor switch 7 and the switching switches LBS1 to LBS4.

  In the second embodiment, a power failure and power recovery operation are performed using the section switches PAS1 and PAS2 for power distribution work or the like, but power failure and power recovery can be performed without stopping the portion other than the stop section. it can. Moreover, since the system disconnection can be performed at high speed using the semiconductor switches 7 and 8, a cross current detection method using parallel power distribution can be adopted, and a power recovery operation can be performed without a power failure. In addition, by providing the switching switches LBS1 to LBS8 for line selection, it becomes possible to share the semiconductor switches 7 and 8, and by providing only one set of the semiconductor switches 7 and 8, it is possible to perform a power failure and power recovery operation. The switching operation at high speed can be realized in a small and inexpensive manner. Furthermore, an uninterruptible power supply (UPS), which has been conventionally provided as a power failure countermeasure at the time of system switching, in the important load facility of the station becomes unnecessary.

It is a block diagram at the time of the power supply switching operation of the power distribution system switching apparatus by Embodiment 1 of this invention. It is a block diagram at the time of the section stop of the distribution system switching apparatus by Embodiment 2 and a power recovery operation. It is a block diagram at the time of the power supply switching operation of the conventional power distribution system switching apparatus. It is a block diagram at the time of the section stop and power recovery operation of the conventional distribution system switching apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 3 ... DC bus 5,6 ... Feeding line 7,8 ... Semiconductor switch VCB1-VCB8 ... Circuit breaker DS1-DS8 ... Disconnector 21L, 22L, 12L, 11L ... Feeding wire LBS1-LBS8 ... Switching switch

Claims (2)

  Connect multiple feeders to the DC bus of the localization substation via a circuit breaker and disconnector, and connect multiple feeders to the DC bus of the substation via a circuit breaker and disconnector In the distribution system switching device in which the feeder on the localization side and the feeder on the opposite side are connected via a feeder line, a common semiconductor switch is connected between the DC bus and each feeder on the localization side. Each switch connected in series with each semiconductor switch and each switching switch connected in series, and between the DC bus and each feeder line on the opposite side, a common semiconductor switch and each of these semiconductor switches connected in series A distribution system switching device, which is connected via a switching switch, and sequentially switches the power supply of the feeder line by opening / closing the circuit breaker, disconnecting switch, switching switch, and semiconductor switch.   Connect multiple feeders to the DC bus of the localization substation via a circuit breaker and disconnector, and connect multiple feeders to the DC bus of the substation via a circuit breaker and disconnector In the distribution system switching device in which the feeder on the localization side and the feeder on the opposite side are connected via a feeder line, a common semiconductor switch is connected between the DC bus and each feeder on the localization side. Each switch connected in series with each semiconductor switch and each switching switch connected in series, and between the DC bus and each feeder line on the opposite side, a common semiconductor switch and each of these semiconductor switches connected in series Connected via a switching switch and provided with a section switch at both ends of the power cut section of the feeder line, and a power failure occurred by opening / closing the circuit breaker, disconnect switch, switching switch, semiconductor switch, and section switch Section stop And distribution system switch device being characterized in that to perform the power recovery.

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