JP2008043190A - Switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch that can attain cost reduction for an accumulator apparatus within a station, as well as, space-saving, lighter weight of the accumulator apparatus. <P>SOLUTION: A DC electric power supplying power source 34 for extended period of time converts AC electric power that has been made adapted to a lower voltage into DC electric power by a rectifier 36, and outputs it to a DC electric power supplying panel 35 for an extended period of time. When a failure of equipment in an electric power generating station or a substation, or an accident in transmission/transformation system occurs, the system is required to be disconnected. At this time, although a bus bar 2 of electric power supply system is also subjected to blackout, in a DC accumulator apparatus 27 for a short period of time, DC electric power is supplied for a few minutes from EDLC battery via DC-DC converter, to a DC electric power supplying panel 25 for a short period of time; and at the same time, disconnection of system is performed by effecting GCB control (not shown) or the like. Even if a blackout occurs on the AC electric power supply side, electric power can be supplied from the DC accumulator apparatus 27 for a short period of time, to the control mechanism of switches that requires a large amount of current in a predetermined short period of time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention mainly relates to a switch used for a control system in a power plant, a substation, or a substation facility such as a building or an electric railway.

For example, in a substation, in order to supply power economically and constantly, not only converts the power into a voltage suitable for power transmission and use and distributes it to multiple demand areas and customers, but also in the event of an accident It has the role of instantly disconnecting the system and minimizing the impact on other systems.
Therefore, in a substation, in order to fulfill this role, a control system including switches such as a circuit breaker, a disconnecting switch, and a grounding device is provided.

Examples of equipment having a control system equivalent to that of a substation include a power plant, a switching station, a power supply station, and a power supply / substation facility such as a building and an electric railway. Here, these are collectively referred to as a power generation / substation, and a conventional example will be described.
FIG. 14 is a circuit configuration diagram showing a power supply facility in a conventional power substation.

  In FIG. 14, high voltage power is supplied from the bus 2 of the power supply system 1 to the switchboards 11a and 11b via the power supply lines 3a and 3b. The power reduced by the switchboards 11a and 11b is supplied to the DC power supply system 14. The power supply panel 15 supplies power to the DC devices (not shown).

Here, the DC power supply system 14 is connected to the two secondary systems of the switchboards 11a and 11b from the bus 2 when any one of the secondary systems is out of power. This is to supply.
The DC power supply system 14 includes a rectifier circuit 16 and a DC power storage device 17 such as a lead storage battery. The rectifier 16 converts the reduced AC power into DC power, supplies the DC power to the power supply panel 15 and charges the DC power storage device 14. For example, when the primary (bus side) system fails, power is supplied from the DC power storage device 17 to each DC device via the power supply panel 15.

Note that AC power is directly supplied from the switchboards 11a and 11b to an AC load in a place (not shown) via the cables 10a and 10b.
By the way, as a DC device to be operated by the DC power storage device 17, there are a switch drive mechanism (DC motor, tripping and closing coil) installed in a switch installation area, a relay, a status indicator lamp, a control unit, and the like. .

  FIG. 15 is a DC power supply circuit configuration diagram of a switch control system in a power substation. The DC power supply of the power panel 15 is a protection control of a control panel, a protection relay panel, a recorder, etc. installed in the power station control monitoring room 50. The relays and control units in the field control panel 82 installed in the device 19 and the switch installation area 32 are connected to the drive mechanisms and relays of the switches 18a, 18b, and 18c via the field control panel 82.

In these devices, the operation of the control mechanism of the switch is related to the instantaneous interruption of the system, and the operation is completed within one minute, but requires a large current.
Here, the switches 18a, 18b, 18c include circuit breakers, disconnectors, grounding devices, and combinations thereof.

  For example, in the gas circuit breaker, the control current per phase is about 5 amperes (A) and the time required for the switching operation is on the order of 100 ms. However, the DC power storage device 17 can control all the gas circuit breakers at the same time. Capacity is required. The disconnector and the grounding device are controlled according to the sequence, but it is necessary to output a control current of several A for about 10 seconds.

However, in designing the DC power storage device, it is necessary to evaluate the total capacity by combining the capacity required for the short-time power supply (about 1 minute) and the capacity required for the long-time power supply (about 10 minutes). . In the case of a lead storage battery, the required capacity is calculated by the following formula.
K = (1 / L) × C × I
Here, L is a maintenance rate, C is a capacity conversion time coefficient, and I is a necessary current. The capacity conversion time coefficient varies depending on the type of the lead storage battery, but the graph shown in FIG. 16 is obtained with respect to the maintenance time.

  As can be seen from this figure, when the maintenance time is large to some extent, the maintenance time and the capacity conversion time coefficient approach a proportional relationship. That is, if the power supply time is reduced to about 10 minutes or less from the above formula, a large amount of stored power is required to output a large current of several hundreds of amps. As a result, in the power storage device of the power generation / substation, about 2/3 or more of the capacity may be used for short-time power supply such as a switch.

As a result, the volume and weight of the power storage device increase and the cost of the power storage device increases, and there is a problem that the amount of work during enlargement and installation of the power storage device room and replacement is increased.
Further, in such a configuration, since it is necessary to output a large current of several hundreds A from the power storage device to the operation mechanism of the switch, a thick and heavy large-capacity cable is used.

Therefore, the wiring of this large-capacity cable increases the construction cost and requires a wiring space.
By the way, in recent years, a large-capacity electric double layer capacitor (hereinafter referred to as an EDLC storage battery) capable of supplying a large current for a short time for electric power industry equipment is a secondary battery having characteristics of a secondary battery such as a lead storage battery and an electrolytic capacitor. It has been developed (for example, JP-A-2002-34179) and is commercially available. Unlike a conventional secondary battery such as a lead storage battery, this EDLC storage battery is capable of high power output and is suitable as a power source for equipment that requires a large current in a short time. In addition, the EDLC storage battery has excellent characteristics as a secondary battery such as a low environmental load, high-speed charging, and small size.

  In a DC power supply system in a substation, it is necessary to output a current of several hundreds A in several tens of seconds, whereas in a power storage device made of a conventional lead storage battery, the output current density is small. Therefore, a large amount of stored electric power was required. For this reason, there existed a problem that the volume and weight of an electrical storage apparatus will become large.

  On the other hand, since the EDLC storage battery has a low stored power density, several hundreds of cells are required to maintain the output for several tens of minutes, leading to an increase in size and cost of the apparatus.

  Furthermore, the number of balance circuits that can be installed to prevent overvoltage applied to the EDLC increases corresponding to the number of cells, leading to an increase in cost and further failure risk, and the advantage of using an EDLC battery is lost. It will be.

  An object of the present invention is to provide a switch capable of reducing the cost of a power storage device in a place and reducing the space and weight of the power storage device.

  A switch installed in a switch installation area such as a substation or a substation facility in the present invention is a storage battery having a predetermined high output density as a direct current power source for driving or controlling an operating device for shutting off or turning on the switch body. Is provided in any one of the operation box of the switch or the on-site control panel or the dedicated storage box of the DC short-time power storage device.

  The present invention can reduce the cost of a power storage device in an electric station such as a power generation substation, and can also save space and weight of the power storage device.

FIG. 1 is a circuit configuration diagram showing a first embodiment in which a DC power supply system according to the present invention is applied to a power supply system in a substation.
In FIG. 1, high voltage power is supplied from the bus 2 of the power supply system 20 to the switchboards 21a and 21b via the power supply lines 3a and 3b, and the output of the AC power reduced by the switchboards 21a and 21b is 2 respectively. The system is divided into systems, one of which is a DC short-time power supply system 23 having a DC short-time power supply 24 and a DC short-time power supply panel 25, and the other is a DC long-time power supply 34 and a DC long-time power supply system 23. It is supplied to a DC long-term power supply system 33 having a power supply panel 35.

  The DC short-time power supply 24 includes a rectifier 26 that converts AC power from the switchboards 21a and 21b into DC power, and a large-capacity electric double layer capacitor (hereinafter referred to as EDLC battery) having a predetermined high output density as shown in FIG. (Referred to as “Electric Double Capacitor”) 41, comprising a DC short-time power storage device 27 constituted by a charging circuit 42 and a DC-DC converter 43.

  Here, the EDLC storage battery 41 has recently been developed as a new battery having the characteristics of a secondary battery such as a lead storage battery and an electric field capacitor. It is possible and is suitable for the power supply of equipment that requires a large current in a short time. In addition, the EDLC storage battery has excellent characteristics as a secondary battery such as a low environmental load, high-speed charge / discharge, and a small size.

The DC long-term power supply power supply 34 is a DC long-term power source composed of a rectifier 36 that converts AC power of the switchboards 21a and 21b into DC power, and a lead storage battery having a predetermined energy density (accumulated power density), for example. Power storage device 37.
Note that as the DC long-time power storage device 37, a NAS battery, an alkaline battery, or a nickel cadmium battery may be used instead of the lead storage battery.

Here, the EDLC storage battery has a higher output density than the battery used in the DC long-term power storage device, but has a lower energy density.
Next, the operation of the DC power supply system configured as described above will be described.
First, in the DC short-time power supply system 23, the DC short-time power supply power supply 24 converts the AC power reduced in voltage into DC power by the rectifier 26 and outputs it to the DC short-time power supply panel 25. Further, the DC power output from the rectifier 26 is supplied to the EDLC storage battery 41 via the charging circuit 42 of the DC short-time power storage device 27 shown in FIG. It is charged to become.

  Next, in the DC long-time power supply system 33, the DC long-time power supply power supply 34 converts the AC power reduced in voltage into DC power by the rectifier 36 and outputs it to the DC long-time power supply panel 35. Further, the lead-acid battery of the DC long-time power storage device 34 is always charged by the DC power output from the rectifier 36 so as to be equal to or higher than a certain voltage.

  In such a state, for example, when a failure of the equipment in the substation or an accident of the transmission and substation system occurs, it is necessary to disconnect the system. At this time, the bus 2 of the power supply system also fails, but the DC short-time power storage device 27 supplies several minutes of DC power from the EDLC storage battery 41 to the DC short-time power supply panel 25 via the DC-DC converter 43. At the same time, the system is disconnected by performing GCB control (not shown).

Further, DC power is supplied from the lead storage battery of the DC long-time power storage device 37 to the DC long-time power supply panel 35 for several tens of minutes.
Therefore, even if a power failure occurs on the AC power supply side, power can be supplied from the DC short-time power storage device 27 to a switch control mechanism that requires a large current in a predetermined short time. In addition, power can be supplied to the operation / display panel that requires a small current for a long time from the DC long-time power storage device 37, and an alarm display, a power failure protection operation, and the like can be performed for a certain period of time.

Here, a configuration example of the EDLC storage battery 41 attached to the DC short-time power supply power source 24 will be described with reference to FIG.
3, the EDLC storage battery 41 is configured by connecting a plurality of EDLC cells 69a, 69b, 69c,... (For example, 50 EDLC cells each having a capacity of 200F) in series. Each EDLC cell 69a, 69b, 69c,... Is connected in parallel with a balancer circuit 70a, 70b, 70c,.

  The EDLC storage battery 64 has two charging terminals 71 and 72 for main charging and high-speed charging on the input side and two output terminals 73 and 74 for output and control on the output side. Is connected to one end of a series circuit of a limiting resistor (for example, 50Ω) 75, a backflow prevention diode 76 and a disconnect switch 77, and the other end of the series circuit is connected to output terminals 73 and 74 via disconnect switches 78a and 78b, respectively. Connected to.

  Further, one end of a series circuit of a limiting resistor (for example, 10Ω) 79, a backflow prevention diode 80, and a disconnect switch 81 is connected to the other high-speed charging terminal 72, and the other end of the series circuit is connected to the main charging terminal. The other end of the series circuit on the 71 side is connected in common, and one end of the series circuit of the EDLC cells 69a, 69b, 69c,. In this case, the other end of the series circuit of the EDLC cells 69a, 69b, 69c,... Is connected to the ground terminal 82.

Here, the operation of the EDLC battery 41 will be described with reference to FIG.
First, in the case of performing initial charging, in addition to the DC output device and the control unit, a separate high-speed charging DC power source (not shown) is connected to the EDLC storage battery 41 to the high-speed charging terminal 72. Here, all the disconnect switches are in a disconnected state. In this state, the disconnect switch 81 is turned on, and a separate high-speed charging DC power source (not shown) is turned on, whereby the EDLC cell is charged at high speed.

  When the EDLC cell is charged to almost the rated voltage, the high-speed charging disconnect switch 81 is turned off, and the separate high-speed charging DC power supply is removed. When the main charging disconnect switch 77 and the output disconnect switch 78a are turned on, the DC output device 63 subsequently charges the battery.

In this state, when a control signal is input from the control device to the trip circuit of the circuit breaker, the power charged in the EDLC cell is supplied to the trip coil of the operation circuit, and the circuit breaker is shut off.
Here, when maintaining the EDLC storage battery 41, for example, a simulated load of 10Ω is connected to the output terminal 74, and in this state, the two separation switches 77 and 78a for charging are turned off, and the separation switch 78b is turned on. A current flows through the connection resistance, and the EDLC cell can be discharged at a high speed.

  As described above, in the present embodiment, the DC short-time power supply power supply 24 and the DC long-time power supply power supply 34 are configured as two systems of DC power supply, and the DC short-time power supply power supply 24 includes the EDLC storage battery 41. Since the power storage device 27 for time is configured, unlike a conventional secondary battery such as a lead storage battery, high power output is possible for a predetermined short time, and therefore, the power storage device as a whole is stored. Electric power can be reduced.

In addition, the cost can be greatly reduced, the size can be reduced, and the weight can be reduced as compared with the conventional case.
By the way, according to the calculation by the present inventors, when the short-time power supply power is designed to be output at 330A for 1 minute and the long-time power supply power at 35A for 30 minutes, the cost is 70% of the conventional and the volume ratio is 1 / 3 and weight ratio 1/4, respectively, can be significantly reduced.

Furthermore, since the EDLC storage battery 41 is used for the charging device, unlike the conventional secondary battery, it is possible to reduce the environmental load and increase the charging speed.
In addition, by separating the system into two systems, the short-time power supply power source 24 and the long-time power supply power source 34, the following effects can be obtained.
(1) In power stations and substations, the required scale (capacity) often increases with the passage of time. At this time, it is necessary to increase the capacity of the DC power supply, but the required capacity is a large current. In many cases, it is determined by the power for controlling the switchgear that requires power. However, in the present invention, since the short-time power supply power supply 24 and the long-time power supply power supply 34 are separated into two systems, only the EDLC power supply system of the short-time power supply power supply 24 is required for expansion, and the cost can be suppressed.
(2) When controlling a circuit breaker or the like, since a large current is instantaneously output, noise such as surges may enter, which may adversely affect other devices such as surrounding electronic devices. Measures such as mounting a surge suppression element are taken. In addition, when 100A is output due to the internal resistance of the secondary battery, for example, there is a possibility that a voltage drop of several tens of volts will occur. Measures such as doing are taken. Such measures can be reduced or eliminated by separating the two systems.
(3) If the system is divided into two systems, the short-time power supply 24 is no longer required to be installed at the same place as the long-time power supply 34 in the control room or battery room. That is, the short-time power supply 24 can be disposed in the proximity of the switchgear. Since the EDLC storage battery 41 can be charged with a small current, when the EDLC storage battery 41 is arranged at a position close to the switchgear, wiring is performed with a thin cable up to the position close to the switchgear. That is, it is possible to reduce the cable amount and simplify the cable installation work. In addition, when the battery is arranged in the control room as before, the cable from the battery to the load (for example, the circuit breaker) becomes several tens of meters and the electrical resistance increases, so the cable is thickened or the number is increased. In some cases, the wiring capacity is secured by, for example, installing the EDLC storage battery 41 on the load side, the cable length can be shortened, and there is no need to consider a potential drop.

In the above embodiment, the DC-DC converter 43 is used for the DC short-time power storage device 27 to compensate for the reduction in the output voltage during discharging. However, by selecting the capacity of the EDLC storage battery 41, the DC-DC converter Can be omitted.
In the above embodiment, the AC output of the switchboards 21a and 21b is divided into two systems and supplied to the rectifiers 26 and 36, respectively, and the DC power converted into DC by these rectifiers is stored in the DC short-time power storage device 27 and the DC long-time. However, the AC output of the switchboards 21a and 21b is given to one rectifier, the output system of this rectifier is divided into two, one of which is the DC short-time power storage device 27 and the other. Even when the DC power is supplied to the DC long-time power storage device 37, the same effects as those of the above embodiment can be obtained.

  In addition, as a wiring method, wiring methods other than the above may be used, but in any case, it is divided into a system that requires a large current and a system that requires a long-time output. By applying the EDLC storage battery, it is possible to obtain the same effects as those of the above embodiment.

FIG. 4 is a circuit configuration diagram showing a case where the second embodiment of the DC power supply system according to the present invention is applied to a control system in a power generation / substation.
In FIG. 4, high voltage power is supplied from the bus 2 of the power system 20 to the distribution boards 21a and 21b via the power supply lines 3a and 3b, and the AC power that has been reduced in voltage by the distribution boards 21a and 21b is divided into two systems. The DC long-time power supply power source 52 installed in the substation control / monitoring room 50 through the wiring 51 commonly connected to one of them, and the dedicated box in the switch installation area 60 through the wiring 61 commonly connected to the other. The power is supplied to the installed short-time power supply 62.

  The DC long-time power supply source 52 includes a DC output device 53 configured with a rectifier circuit and a DC long-term power storage device 54 configured with a lead battery or the like. The DC long-time power supply source 52 is connected to a DC long-time power supply panel 55. A part of the wiring 56a drawn from the DC long-time power supply panel 55 is connected to a protection control device 57 such as a control panel, a protection relay panel, or a recorder installed in the substation control / monitoring room 50. Is supplied. Further, the other wiring 56b is connected to a small current control circuit 86 such as a display circuit or an interlock circuit of the switchgear device via a field control panel 84 installed in the switch setting area 60, and each is supplied with electric power.

The DC long-time power supply power source 52, the DC long-time supply panel 55, and the wirings 56a and 56b constitute a DC long-time power supply system.
On the other hand, the DC short-time power supply 62 includes a DC output device 63 and an EDLC storage battery 64 configured by a rectifier circuit. The output of the DC short-time power supply source 62 is connected to the circuit breakers 66-1a, 66-1b, 66-1c, 66-2a, 66-2b, 66 corresponding to each of a plurality of three phases via the on-site control panel 84. 2c,... Are connected to a high-current short-time control circuit 85 such as a trip coil control circuit, a driving coil control circuit, and a driving DC motor control circuit.

FIG. 5 is a circuit diagram showing details of the tripping circuit of the operating device in each circuit breaker 66 to which DC power is supplied from the DC short-time power supply power supply 62 through the DC power supply line 65.
In FIG. 5, 66a is a breaker body connected to a main circuit (not shown), 66b is a breaker operation box having a tripping coil L connected to a DC power line 65, and 84 is in series with the tripping coil L. It is an on-site control panel provided with a contact S that is provided and is closed by a trip command issued from the control device of the in-house control management room.

  In the above description, only the trip circuit of the operating device is shown, but the closing circuit is configured similarly. In the above description, the DC power is supplied from the DC short-time power supply 62 to the trip circuit 66b of the operation circuit of the circuit breaker 66. However, in the operation device such as a disconnector or a grounding device, the short-time power supply is performed. Necessary equipment is also connected to the DC power supply line 65 as described above.

Next, the operation of the DC power supply system according to the second embodiment configured as described above will be described.
First, in the DC short-time power supply power supply 62 in the switch installation area 60, the DC output device 63 converts the reduced AC power into DC power by the rectifier circuit and outputs it to the DC power line 65. Further, the EDLC storage battery 64 is always charged with a constant voltage or higher by the direct current output from the direct current output device 63. Here, since the charging current is, for example, 1 A or less per one EDLC storage battery 64, the DC output device 63 to the EDLC storage battery 64 can be wired with a thin cable.

For example, a current of 5 A is supplied from the EDLC storage battery 64 to the trip circuit of one circuit breaker 66 during a power failure. These are controlled to disconnect the system.
On the other hand, in the DC long-time power supply power source 52 of the substation control management room 50, the DC output device 53 converts the reduced AC power into DC power by the rectifier circuit and outputs it to the DC long-time power supply panel 55. Is done. DC power is supplied from the DC long-time power supply panel 55 to the control device 57 and the like, and at the same time, the DC long-time power storage device 54 is charged.

In the event of a power failure, DC power is supplied from the DC long-term power storage device 54, and alarm display and power failure protection operations are performed over a certain period of time while maintaining the interlock function.
In addition, when a control signal is input to the trip circuit of the circuit breaker 66 from a control device (not shown) with the EDLC storage battery 64 charged, the power charged in the EDLC cell by closing the contact S is stored in the operation box 66b. Supplied to the tripping coil L, the circuit breaker is interrupted.

Thus, the following effects can be obtained by applying the above-described EDLC storage battery 64 to the DC short-time power supply source 62 provided in the switch installation area 60.
By providing a DC short-time power supply power source 62 composed of EDLC storage batteries in the switch installation area 60, it is possible to secure a power source that can operate the switch of the substation even if the in-house power supply fails. The recovery time can be greatly shortened by stabilizing the accident and minimizing the scope of the accident. In addition, unlike conventional secondary batteries such as lead-acid batteries, high power output is possible for a short time, and the power stored in the entire power storage device can be reduced. Cost reduction, size reduction, and weight reduction can be achieved.

In addition, by using an EDLC storage battery, it is possible to reduce the environmental load and increase the charging speed.
Furthermore, conventionally, since the power supply power source for DC short-time use is integrated with that for long-time use, a large site is required and it is provided in a substation control management room (or power supply room). At this time, since it is necessary to supply a large current of 100 to 400 A to the switch during a power failure, a thick cable having a capacity corresponding to this must be wired from the control management room to the switch installation area, and the wiring space In addition, it required time and cost for wiring when constructing or remodeling the substation.

  However, in this embodiment, the cable wired from the switchboard to the DC short-time power supply power source requires the EDLC storage battery for charging, and the required capacity is about 10 A at most, so there is a special wiring space. This is unnecessary, and wiring costs and time can be greatly reduced.

Furthermore, since the cable for flowing a large current is only between the EDLC storage battery and the operation device of each switch, the construction cost, the area necessary for wiring, and the like can be significantly reduced.
Moreover, when the battery is arranged in the control room as before, the cable from the battery to the load (for example, the circuit breaker) becomes several tens of meters, the electrical resistance increases, and the required cable becomes thick. In some cases, the cable length can be shortened by installing the EDLC storage battery 41 on the load side, and there is no need to consider a potential drop.

FIG. 6 is a circuit configuration diagram showing a case where the third embodiment of the DC power supply system according to the present invention is applied to a control system in a substation, and the same parts as those in FIG. Here, different parts are described.
In the second embodiment described above, the DC short-time power supply source 62 including the DC output device 63 configured by a rectifier and the EDLC storage battery 64 is arranged in the switch installation area. A DC output device 63 is provided in the control monitoring room 50, and the DC power is supplied to the DC power line 65 wired in the switch installation area via the cable 88, and a plurality of DC power lines 65 are supplied to the DC power line 65. Corresponding to each group of switches grouped into groups, for example, circuit breakers 66-1a to 66-1c, 66-2a to 66-2c, 66-3a to 66-3c, 66-4a to 66-4c,. The plurality of EDLC storage batteries 64a, 64b,... Connected in this manner are charged. In the present embodiment, an example in which the EDLC storage batteries 64a and 64b are housed in the on-site control panels 87a and 87b is shown.

Even in such a configuration, in addition to obtaining the same effect as the second embodiment, the DC output device 63 having a shorter life than the EDLC storage battery 64 is installed in the control monitoring room, so that maintenance and replacement are easy. Can be done.
In addition, since the switches in the switch installation area are grouped into a plurality of groups and the EDLC storage batteries 64a, 64b,... Are arranged corresponding to these groups, the EDLC storage batteries 64a, 64b,. The number, capacity, and method of wiring to the control device can be optimized according to the configuration of the substation. Furthermore, since the DC output devices 63 installed in the control monitoring room are commonly used for the EDLC storage batteries 64a, 64b,... Arranged corresponding to the switch groups, the number of DC output devices 63 is reduced. It can be reduced and the whole system can be simplified.

FIG. 7 is a circuit configuration diagram showing a case where the fourth embodiment of the DC power supply system according to the present invention is applied to a control system in a substation, and the same parts as those in FIG. Here, different parts are described.
In the present embodiment, the cable 88 connects the output terminal of the DC output device 53 of the DC long-time power supply power source 52 installed in the control monitoring room and the DC power line 65 in the switch installation area 60. Switches grouped into a plurality of groups on the DC power supply line 65, for example, circuit breakers 66-1a to 66-1c, 66-2a to 66-2c, 66-3a to 66-3c, 66-4a to 66-4c ,... Are charged with respect to a plurality of EDLC storage batteries 64a, 64b,.

Even with such a configuration, in addition to the same effects as those of the second embodiment, the DC output device 53 of the DC long-time system is shared, thereby simplifying the DC output device and reducing the cost. You can plan.
In the second to fourth embodiments, the case where the DC short-time power supply 62 or the EDLC storage battery 64 is installed separately from the switch in the switch installation area has been described. However, the switch operating device is driven and controlled. The direct current output device (rectifier) 63 and the EDLC storage battery 64 of the direct current short-time power supply 62 to be provided may be provided in an operation box in which an operation device of the switch is accommodated.

FIG. 8 shows an EDLC storage battery 64 in which a DC output device 63 is installed outside a circuit breaker, for example, and drives and controls each operation device 66b of the circuit breakers 66-1a, 66-1b, 66-1c corresponding to each of the three phases. It is configured to be stored in the operation box.
FIG. 9 shows a configuration in which a DC output device 63 and an EDLC storage battery 64 made of a rectifier are housed in an operation box that drives and controls the operation devices 66b of the circuit breakers 66-1a to 66-1c corresponding to the three-phase phases. It is what.

  FIG. 10 shows a case where the DC output device 63 and the EDLC storage battery 64 are housed in one operation box of the circuit breakers 66-1a to 66-1c corresponding to each of the three phases, for example. The circuit breaker operating device 66b is connected so as to be able to supply DC power for driving control.

  Further, FIG. 11 shows, for example, that the DC output device 63 and the EDLC storage battery 64 are accommodated in one operation box of the circuit breakers 66-1a to 66-1c corresponding to the three-phase phases, and the EDLC storage battery is stored in another operation box. In this configuration, only 64 are stored, and the EDLC storage battery 64 in another operation box is connected to be rechargeable by a DC current output from the DC output device 63 in one operation box.

With such a configuration, by incorporating the EDLC storage battery 64 in the switch operation box, the external wiring of the high-current cable becomes unnecessary, and not only the structure can be simplified, but also an accident caused by the cable wiring can be avoided. Prevention and reduction of on-site assembly costs.
In the above description, the DC output device (rectifier) 63 and the EDLC storage battery 64 are stored in the switch operation box. However, the installation and storage mode is not limited to this. For example, the switch operation box In place of this, it is possible to adopt a configuration in which it is stored in the operation panel on the site, or a configuration in which a dedicated storage box for the DC short-time power storage device is provided and stored in this case. Can obtain the same effect as described above.

  Furthermore, the DC short-time power storage device is provided with an attachment mechanism that can be attached to any one of the switch tank, operation box, and field operation panel, and by this attachment mechanism, the switch tank, operation box, and outer surface of the field operation panel The DC output device (rectifier) 63 and the EDLC storage battery 64 may be attached to the external device.

In the above embodiments, a circuit breaker is used as the switch, and the operation device is driven or controlled by a DC short-time power supply. However, the switch can be applied to a disconnector, a grounding device, or the like. .
FIG. 12 is a circuit configuration diagram showing a case where the fifth embodiment of the DC power supply system according to the present invention is applied to a control system in a substation, and the same parts as those in FIG. Here, different parts are described.

  In the present embodiment, the cable 88 connects the output terminal of the DC output device 53 of the DC long-time power supply power source 52 installed in the control monitoring room and the DC power line 65 in the switch installation area 60. Are connected to the DC power supply line 65 in the storage boxes 87a, 87b, 87c,... Of the plurality of switching devices 81a, 81b, 81c,.

  FIG. 13 is a circuit diagram showing an example of the internal configuration of the opening / closing device 81. The switchgear 81 includes a circuit breaker 82 connected to the main circuit of the power system, disconnectors 83 and 84 connected to both sides of the circuit breaker 82, and an electric circuit connecting the circuit breaker 82 and the disconnector 83. An earthing device 85 connected between the earthing point and an EDLC storage battery 64 installed in a storage box such as an operation box of the switchgear 81 or a field control panel or a dedicated box. A direct current is supplied to the operation devices 84 and the grounding device 85 so that a predetermined sequence operation can be performed.

Here, an example of the sequence control operation will be briefly described as follows.
First, the tripping circuit of the circuit breaker 82 is excited by the direct current supplied from the EDLC storage battery 64, so that the circuit breaker 82 is cut off, and the power system is disconnected and controlled. Then, after the breaker 82 is completely electrically cut off by the direct current supplied from the EDLC storage battery 64, the disconnecting devices 83 and 84 are opened, and at the same time, the grounding device 85 is closed.

  As described above, in the fifth embodiment, since the EDLC storage battery 64 is provided in the storage box of the switchgear 81 and contributes as a driving power source for each switchgear, the same effects as those of the second embodiment can be obtained. Unlike the case where the EDLC storage battery 64 is provided outside the switchgear 81, the external wiring of the large current cable is not necessary, and not only the structure can be simplified, but also the accident associated with the cable wiring can be prevented. It is possible to reduce on-site assembly costs.

  In the above embodiment, the DC output device 53 is shared with the DC output device 53 of the DC long-time power supply power source 52 installed in the in-house control monitoring room, and the DC output is stored in the storage box of each switching device 81a, 81b, 81c,. The EDLC batteries 64a, 64b, 64c,... Built in the 89a, 89b, 89c,... Are supplied and charged through the cable 88 and the DC power line 65, respectively, but this DC output device is integrated with the EDLC battery. You may make it incorporate in the storage box 89 of each opening-and-closing apparatus 81. FIG.

  In the above embodiment, one EDLC storage battery is built in a storage box of one switchgear and direct current is supplied to the operation device of each switchgear. The EDLC storage battery may be built in the form shown in any of FIGS.

  In the fifth embodiment, the EDLC storage battery built in the storage box of the switchgear serves as a driving power source necessary for the opening / closing operation of each switch. Alternatively, a large direct current can be supplied for a short time in any case of a direct current motor.

  In each of the above-described embodiments, the case where the DC power supply system according to the present invention is applied to a power substation is described as an example. However, a power storage device is installed in an electric station such as a large building substation or an electric railway substation. In such a case, it is possible to reduce the cost and save space by configuring the same DC power supply system as described above.

  ADVANTAGE OF THE INVENTION According to this invention, the switch which can aim at the cost reduction of the electrical storage apparatus in electric power stations, such as a power generation substation, and the space saving and weight reduction of an electrical storage apparatus is obtained.

FIG. 1 is a circuit configuration diagram showing a first embodiment in which a DC power supply system according to the present invention is applied to a power supply system in a substation. FIG. 2 is a block circuit diagram showing details of the DC end time power storage device in the same embodiment. FIG. 3 is a circuit diagram showing a configuration example of the EDLC storage battery in the same embodiment. FIG. 4 is a circuit configuration diagram showing a case where the second embodiment of the DC power supply system according to the present invention is applied to a control system in a power generation / substation. FIG. 5 is a circuit diagram showing details of the trip circuit of the operating device for the circuit breaker to which DC power is supplied from the DC short-time power supply power source in the same embodiment. FIG. 6 is a circuit configuration diagram showing a case where the third embodiment of the DC power supply system according to the present invention is applied to a control system in a power generation / substation. FIG. 7 is a circuit configuration diagram showing a case where the fourth embodiment of the DC power supply system according to the present invention is applied to a control system in a power generation substation. FIG. 8 is a configuration diagram showing a first example in which a rectifier of a DC short-time power supply power source and an EDLC storage battery are incorporated in an operation device of a switch in the second to fourth embodiments of the present invention. FIG. 9 is a block diagram showing the second embodiment. FIG. 10 is a block diagram showing the third embodiment. FIG. 11 is a block diagram showing the fourth embodiment. FIG. 12 is a circuit configuration diagram showing a case where the fifth embodiment of the DC power supply system according to the present invention is applied to a control system in a power generation / substation. FIG. 13 is a circuit diagram showing an example of the internal configuration of the switchgear according to the embodiment. FIG. 14 is a circuit configuration diagram of a power supply system in a power substation to which a conventional DC power supply system is applied. FIG. 15 is a circuit configuration diagram of a control system operated by a conventional DC power supply system. FIG. 16 is a curve diagram showing the relationship between the discharge time of the lead storage battery and the capacity conversion time coefficient in the conventional DC power supply system.

Claims (4)

In a switch installed in a switch installation area such as a substation or a substation facility, a storage battery having a predetermined high output density is provided as a direct current power source for driving or controlling an operation device for shutting off or turning on the switch body. A switch comprising a DC short-time power storage device in an operation box of a switch or an on-site control panel or a storage box made of one of the dedicated storage boxes for the DC short-time power storage device. In a switch installed in a switch installation area such as a substation or a substation facility, a storage battery having a predetermined high output density is provided as a direct current power source for driving or controlling an operation device for shutting off or turning on the switch body. A switch comprising a DC short-time power storage device, the DC short-time power storage device having a mechanism that can be attached to an operation box of a switch or a field control panel. 3. The switch according to claim 1, wherein the storage battery of the DC short-time power storage device is composed of an electric double layer capacitor, and has a terminal for charging the storage battery with an external DC output device. 3. The switch according to claim 1, wherein the storage battery of the DC short-time power storage device is composed of an electric double layer capacitor, and further includes a DC output device for charging the storage battery.

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