JP2006033921A - Uninterruptive switching device between different power sources using section switches - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device which enables uninterruptive switching safely and surely by arranging only a cable from a mobile generator as regards a connecting cable for the main circuit to the side of relief load. <P>SOLUTION: A misoperation preventive device for preventing the misoperation of a section switch and a synchronous controller are attached to a utility pole, and a voltage signal to be taken in the synchronous controller is detected with a noncontact-type sensor. The operation string of the section switch is taken in the misoperation preventive device, and in an asynchronous state, this string is locked. Moreover, the synchronous controller and the mobile generator are provided severally with radio transmitters, and this device executes the synchronous operation, based on the signal transferred via this radio transmitter. At the point of time when the synchronization is taken, this releases the lock state to the operation string of the misoperation preventive device, and the user operates the section switch by pulling the operation string. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an uninterruptible switching apparatus between different power sources that performs uninterruptible switching to a moving power generator using a distribution switch of a distribution line when performing a power failure construction or the like in a part of a commercial distribution line. Is.

When power outage work is performed in a section of the commercial distribution line, a mobile power generator (mobile power supply car) is installed to supply power to the load after the power outage work section. Electric power is supplied to the load side to be relieved by switching to the generator side without interruption.
Conventionally, as this uninterruptible switching method, it has been implemented by a technique as shown in Patent Document 1. In other words, a bypass circuit consisting of a main circuit connection cable and a temporary circuit breaker is provided between the commercial power supply side and the load side across the load side section switch to be relieved, and the relief load side is for movement Connect the output cable from the power generator through the circuit breaker. Thereafter, the bypass circuit and the power generator for movement are synchronized, and the generator circuit breaker is synchronously turned on or released in a synchronized state to realize uninterruptible switching or uninterruptible switchback.

In this uninterruptible switching method, the section switch can be turned on and off manually, so it can be turned on even when it is not synchronized. Therefore, a bypass circuit is constructed to prevent accidents caused by asynchronous turning. There was a need.
However, the thing of the patent document 1 requires the connection cable for main circuits for comprising a bypass circuit also on the power supply side of a distribution line, and requires the effort and time for carrying out live connection of this cable, Since the power generation device for movement had to be installed near the section switch, there was a problem that the installation location was limited. Therefore, Patent Document 2 and Patent Document 3 are known as methods for realizing uninterruptible switching / switchback.
No. 5-8766 JP-A-6-153422 Japanese Patent Laid-Open No. 11-122844

In Patent Document 2, a clamp-type voltage / current detector is attached to the power distribution line of the sorting switch, and the voltage signal detected by the detector is transmitted to the moving power generator for automatic phase tracking control. In this way, it is possible to safely carry out synchronization. In this method, in order for the mobile power generation device to perform automatic phase tracking control, it is necessary to transmit a signal with high accuracy, and in consideration of the transmission quality, it is unavoidable to use a wired transmission means. For this reason, the distance between the section switch and the moving power generator is limited to about 100 m.
In Patent Document 3, a temporary switch is connected in parallel with a section switch, the power supply side and the load side are tested for synchronization, and when the synchronization is possible, the temporary switch is released and the synchronous switch is executed. To do. In the case of this method, the signal transmitted to the mobile power generation device is a synchronization signal, and only the increase / decrease in voltage, increase / decrease in frequency, and ON / OFF of completion of synchronization application, so high transmission quality is not required. Therefore, the separation switch, the temporary switch, and the moving generator can be separated by about 300 m, and the degree of freedom of installation of the moving generator is increased.
However, on the other hand, since the temporary switch is connected in parallel with the section switch, it is necessary to connect the power supply of the section switch to the temporary switch and the load side with cables. And takes time.

  The present invention has been made in view of such a point, and the object of the present invention is to enable a safe and reliable uninterruptible switching as the main circuit connection cable to the relief load side is only a cable from the power generator for movement. It is to provide an apparatus.

The first of the present invention is to release a section switch between a commercial power source and a load, dispose a moving power generation device for the load after the released section switch, and connect between the commercial power source and the moving power generation device. In the case of switching power back and forth with no power failure,
A synchronous control device and an erroneous operation prevention device are attached to the power pole in which the section switch is arranged, and the synchronous control device includes at least a phase rotation confirmation unit, a voltage difference confirmation unit, a frequency difference confirmation unit, a phase difference confirmation unit, and current load power. An electric power calculation unit for calculating the operation and a wireless transmission device, the erroneous operation prevention device is provided with a winding drum for taking in the operation string of the section switch, a ratchet mechanism and an unlocking unit having an electromagnet, and the power generation for movement A wireless transmission device is provided in the device for transmitting and receiving signals to and from the synchronous control device, and a non-contact voltage / current sensor is attached to the commercial power supply side distribution line of the division switch, and the relief side distribution line of the division switch A non-contact voltage sensor is attached to the voltage sensor, and the detected voltage signals of the voltage / current sensor and the voltage sensor are sent to the phase rotation confirmation unit, voltage difference confirmation unit, frequency difference confirmation unit and phase difference confirmation unit of the synchronous control device. Each of these confirmation units exchanges signals with a mobile power generation device via a wireless transmission device to execute a synchronization operation, and when the voltage, frequency, and phase are within an allowable range, the erroneous operation prevention device It is configured to operate the sorting switch by sending a synchronization completion signal to the unlocking portion of the lock and releasing the locking, and pulling the sorting string of the sorting switch taken into the erroneous operation preventing device at the time of unlocking. It is a thing.

  A second aspect of the present invention is characterized in that a wireless repeater is interposed between the synchronous control device and the moving power generation device.

  According to a third aspect of the present invention, a voltage correction unit is provided in the voltage difference confirmation unit of the synchronous control device, and the detected voltage is corrected to a reference voltage.

  According to a fourth aspect of the present invention, an automatic load transfer / disconnection control unit is provided in the mobile power generation device, and an operation completion notification unit is provided in the erroneous operation prevention device. The mobile power generation device is characterized in that the load is taken in or the load is disconnected through the automatic load transfer / disconnection control unit based on the signal from the notification unit.

  According to a fifth aspect of the present invention, an ID number is assigned to each of the wireless transmission device and the wireless repeater of the synchronous control device and the mobile power generation device.

  A sixth aspect of the present invention is characterized in that the voltage / current sensor and the voltage sensor are non-contact sensors.

As described above, the present invention has the following effects.
(1) Since there is no need to configure a bypass circuit for power as in the prior art in the power generator for movement, it is not necessary to install the power generator for movement near the section switch, and the degree of freedom of installation is increased. In addition, a cable and a switch for bypass circuit configuration are not required.
(2) Since there is no need to install a temporary switch in parallel with the section switch, there is no need to strip the wire coating in the live line state, and there is no need to attach a heavy temporary switch to the utility pole. Therefore, the preparation work is greatly shortened.
(3) The safety operation can be switched on (or released) using the segment switch by the erroneous operation prevention device. In addition, although the erroneous operation preventing device has a simple structure using a ratchet mechanism and an electromagnetic lock mechanism, it is possible to reliably lock the switching operation of the division switch other than the completion of synchronization.
(4) The detected voltage signal transmitted between the wireless transmission devices is not directly transmitted, but only transmits a small amount of digital data of about 8 bits, so high-precision data transmission is unnecessary. Transmission over a long distance (several hundred m to 1 km) can be easily performed by radio, and a separation distance between the segment switch and the mobile power generation device can be increased.
(5) Since the voltage / current sensor and the voltage sensor are non-contact type, they can be safely attached to the distribution line using an insulating operation rod. Further, by providing the voltage correction means, it is possible to correct the reference voltage even if a measurement error due to weather or the like occurs, and to perform a synchronization operation within a desired allowable range.
(6) Even if the synchronous control device and the mobile power generation device cannot communicate directly due to the influence of an obstacle, wireless transmission is possible by using a wireless repeater, and the influence of transmission delay due to the small amount of data. Synchronous operation is possible.

FIG. 1 shows a schematic configuration diagram of the present invention. Reference numeral 1 denotes a distribution switch for a distribution line, which is installed on a utility pole 2. The section switch 1 is provided with a lever 1a for turning the switch on and off, an operating cord 1b for connection is connected to one end, and an operating cord 1c for cutting is connected to the other end. By pulling the operating string 1b, the lever 1a moves clockwise around the support shaft and opens the switch. Further, by pulling the operation string 1c, the lever 1a rotates counterclockwise about the support shaft to open the switch.
Reference numeral 3 denotes a synchronization control device. The synchronization control device 3 includes phase rotation, voltage difference, frequency difference, phase difference, power calculation, wireless transmission / reception device, and the like, and is attached to the utility pole 2. The synchronous control device 3 includes a charger and a storage battery, and further includes a distribution line current indicator, a sensor power indicator, a power indicator, and the like. Reference numeral 4 denotes an erroneous operation prevention device for preventing an erroneous operation of the section switch 1 and is attached to the utility pole 2 via a fixing belt.
Reference numerals 5 and 6 are voltage / current sensors, which are non-contact type with a built-in power source such as a battery. The sensors 5 and 6 are arranged on the section switch 1 and the commercial power source side, that is, on the power failure work section side. For example, the voltage / current sensor 5 is active in the white phase and the voltage / current sensor 6 is active in the red phase. Each of the detected outputs is input to the synchronous control device 3 by being attached to the distribution line using an insulating operation rod in the line state.

7 and 8 are voltage sensors, and non-contact type sensors such as alkaline batteries are used. The sensors 7 and 8 are arranged on the load side to be relieved when viewed from the section switch 1. For example, the voltage sensor 7 is in the white phase and the voltage sensor 8 is in the red phase in the live line state. The detected outputs are input to the synchronous control device 3.
Reference numeral 9 is a wireless repeater, 10 is a mobile power supply car that is a power generation device for movement, and this mobile power supply car 10 has a wireless transmission device comprising a transmitter / receiver. Signals are exchanged. Further, the generator output of the mobile power supply vehicle 10 is hot-connected to the distribution line on the relief load side through a circuit breaker (not shown). The wireless repeater 9 is for increasing the distance between the mounting position of the synchronization control device 3 and the mobile power supply vehicle 10 disposed, and is not necessarily required depending on the construction site.

FIG. 2 is a functional configuration diagram of the synchronization control device 3. Reference numeral 11 denotes a phase rotation confirmation unit, which introduces detection signals of the voltage detection units 5a and 6a of the voltage / current sensors 5 and 6 and detection voltage signals of the voltage sensors 7 and 8, respectively, and causes phase rotation on the power supply side and the load side Check the state. When the phase rotation is confirmed, the confirmation signal and the synchronization start signal are output to the AND circuit 12, and when the logical condition is satisfied, the logic signal is sent to the voltage difference confirmation unit 13, the frequency difference confirmation unit 14, and the phase difference confirmation unit 15, respectively. Is output. The voltage signals detected by the voltage / current sensor 5 and the voltage signal detected by the voltage sensor 7 are input to the confirmation units 13 to 15. Moreover, the generator output voltage signal of the mobile power source vehicle 10 is input to the voltage difference confirmation unit 13 via the wireless transmission device 19 formed of a transceiver, and the output frequency of the generator from the power source vehicle is input to the frequency difference confirmation unit 14. A signal is being input.
Reference numeral 16 denotes an AND circuit, which outputs each confirmation signal to the AND circuit 16 when each of the confirmation units 13 to 15 has a difference within an allowable range. The AND circuit 16 outputs a synchronization completion signal to the lock release unit of the erroneous operation preventing device 4 when the logical condition is satisfied, and releases the lock for preventing the erroneous operation.
The voltage / current signals detected by the voltage / current sensors 5 and 6 are output to the power integrating unit 17 to grasp the current power usage state, and the result is displayed on the power display unit 18, and the wireless transmission device 19 is displayed. To the mobile power supply vehicle 10 through the transmission.

FIG. 3 shows a configuration diagram of the malfunction prevention device 4, and power for operation of the malfunction prevention device 4 is supplied from the synchronization control device 3.
An electromagnet coil 20 is normally locked to prevent malfunction, but is excited by the output signal of the AND circuit 16 of the synchronous control device to attract the movable piece 21 upward in the drawing. Reference numeral 22 denotes a locking wheel. A notch 22a is formed at an outer circumferential portion of the locking wheel with an arbitrary interval, and is fixed to the rotary shaft 24. Reference numeral 23 denotes a claw portion. One end side of the claw portion 23 is pivotally supported by a shaft 23a, and a claw 23b is provided on the other end side. The claw portion 23 is normally engaged with the notch portion 22a of the wheel by the action of the spring 23c. Match. And these 21-23 comprise the lock release part which consists of a ratchet mechanism.
The other end of the rotating shaft 24, one end of which is fixed to the locking wheel 22, passes through a bearing 25 such as an oilless bearing and is fixed to the winding drum 26. On the winding drum 26, for example, the operation string 1b or 1c of the section switch 1 is wound once and led out to the lower side of the drawing, and its tip hangs down to a position where the operator can operate. 27 is a drum cover, 28 is a main body cover, 29 is a fixing belt, and 30 is a push button switch serving as a closing completion notification unit. Notify the power car 10 side. Reference numeral 31 denotes a connector, which is electrically connected to the synchronization control device 3 through this connector, and obtains a power source for operation from the synchronization control device. The erroneous operation preventing device 4 constituted by these 20 to 31 is fixed to the utility pole 2 via a fixing belt 29.

Next, the operation will be described.
Prior to the power outage work, preparatory work for uninterruptible switching between the commercial power supply and the mobile power supply car is carried out. The voltage / current sensor 5 and the voltage sensor 7 are attached to the white phase of the distribution line across the section switch 1, and the voltage / current sensor 6 and the voltage sensor 8 are attached to the red phase of the distribution line. Since this sensor is a non-contact type sensor, the work of stripping the wire coating in the live line state is unnecessary, and the sensor can be safely attached using an insulating operation rod.
Next, the synchronous control device 3 and the erroneous operation prevention device 4 are attached to the power pole 2 of the final section switch of the power outage construction section, and the output terminals of the sensors are connected to the synchronous control device 3 via connectors or the like to turn on the power. Check the status and phase rotation status. As a result of the phase detection, the red phase is reattached during the reverse phase. In addition, after carrying out all preparations necessary for uninterruptible switching such as the antenna stand of the wireless repeater 9 and the mobile power supply car, turning on the power supply or control power supply, the communication test of each part, the operation check of the wireless repeater modem, etc. Each phase of the high-voltage cable of the mobile power supply vehicle is hot-wired in accordance with the white phase and red phase of the voltage sensors 7 and 8. As a result, the commercial power source is pressurized up to the generator breaker 52G of the mobile power source vehicle 10, so that the generator AG of the mobile power source vehicle is started and the generator and commercial power source are synchronized on the power source vehicle side. When the charging allowable range is reached, the generator breaker 52G is switched on. Then, the governor of the mobile power supply vehicle is controlled until the distribution line power transmitted from the synchronous control device 3 approaches 0, and the load is gradually taken into the mobile power supply vehicle side.
When the loading of the load to the mobile power supply vehicle is completed, the operator who has been waiting in the final section switch 1 at the end of the power outage construction section is notified by radio or other means of notification, and the operator opens the section switch 1 Then start the power outage work.

When the power outage work is completed, the switchback work is executed.
In the erroneous operation preventing device 4 attached to the utility pole 2, the operation cord 1c is taken in when the section switch 1 is closed (turned on), and is led to the dotted line position shown in FIG. At this time, the operator waits by winding the operation string 1c around the winding drum 26 about one turn.
At the time of switching back, the section switch in the power failure work section is turned on, so the voltage of the commercial power source is applied to the end of the section switch 1 that is in the open circuit state.
When the preparation is completed, a synchronization start signal is output to the logical product circuit 12. The AND circuit 12 outputs a synchronization start signal to each of the confirmation units 13 to 15 on condition that the phase rotations coincide. A voltage correction signal is input to the voltage difference confirmation unit 13 because the sensors 5 and 7 are non-contact type to correct a measurement error caused by a difference in the type and size of a distribution line or weather. Therefore, the detection voltage of the sensor is corrected to, for example, 6600 V, which is a reference voltage. Of course, it is not necessary if the detection accuracy is good.
The voltage difference and frequency difference signals of the confirmation units 13 and 14 are converted into digital signals by the wireless transmission device 19 and transmitted via the modem to the wireless transmission device 10a of the mobile power supply vehicle via the wireless repeater 9. Similarly, the mobile power supply vehicle 10 sends the data to each confirmation unit through the same route. An automatic load transfer / disconnection control unit, a voltage increase / decrease control unit, a frequency increase / decrease control unit, and a power display unit are connected to the mobile power supply vehicle 10 via a wireless transmission device. The voltage and frequency on the mobile power supply vehicle side are adjusted while controlling the AVR and governor based on the frequency difference signal.

When the synchronization between the commercial power supply and the mobile power supply vehicle falls within a predetermined error, the AND circuit 16 outputs a synchronization completion signal to the lock release unit of the erroneous operation preventing device 4 and excites the electromagnet coil 20. Therefore, the movable piece 21 is pulled upward against the spring 23c, the engagement between the claw 23b and the notch 22a is released, and the winding drum 26 is in a freely rotating state. In this state, the operator pulls the operation string 1b to turn on the sorting switch 1.
When the voltage, frequency, and phase are out of the allowable range during the switching operation, the erroneous operation preventing device 4 is again electromagnetically locked and the operating string is prevented from being pulled.
When the switching of the segment switch 1 is completed, an input completion signal is transmitted to the mobile power supply car 10 side by pressing the push button switch 30, and the mobile power supply car receives this to receive an automatic load transition / disconnection control unit. The load is gradually returned from the power source vehicle side to the commercial power source side via the power supply, and the disconnection operation is automatically performed by releasing the generator breaker, and the power supply to the rescue load side by the mobile power source vehicle is completed.

FIG. 4 shows an example in which a power outage work is simultaneously performed with a plurality of distribution lines.
For example, in the case where the switching device to be switched and switched back can be installed at a relatively short distance from the mobile power supply car 10-1 with respect to 1-1, for example, a radio repeater is not required and an erroneous operation prevention device is provided. The included synchronous control device 3-1 directly transmits and receives signals with the mobile power supply vehicle 10-1. In addition, when the target section switch is 1-4, the location of the mobile power supply vehicle 10-4 is not near, and when there are communication obstacles, the wireless repeater 9-1 9-2 is arranged to exchange signals with the synchronous control device 3-4. In this case, the synchronous control device 3-4 becomes a master M and sends / receives a signal to / from the wireless repeater 9-1 which becomes the slave S. Next, the wireless repeater 9-1 and 9-2 are connected to the wireless repeater. 9-1 becomes the master M and sends and receives signals to and from the radio repeater 9-2 that becomes the slave S. Further, between the wireless repeater 9-2 and the mobile power supply vehicle 10-4, the wireless repeater 9-2 serves as a master M and the mobile power supply vehicle 10-4 serves as a slave S to exchange signals.
As shown in FIG. 4, there is a fear of interference when a plurality of transmitter / receivers (wireless transmission apparatuses) of each device exchange signals in close proximity. In order to prevent such interference, different ID numbers (identification labels) such as ID-1, ID-2, and ID-3 are assigned to transmitters / receivers in adjacent areas. However, in principle, only two types of ID-0 and ID-1 are used for the synchronous control device 3.
As shown in FIG. 4, it becomes easy to extend the arrangement distance between the synchronous control device 3 and the mobile power supply vehicle 10 to 1 km or more by interposing a wireless repeater, and the degree of freedom of the location of the mobile power supply vehicle can be increased. it can.

1 is a system configuration diagram showing an embodiment of the present invention. The connection block diagram of a synchronous control apparatus. The block diagram of a malfunction prevention apparatus. The system block diagram which shows other embodiment.

Explanation of symbols

1 ... Division switch
1b, 1c ... operation string 2 ... utility pole
3. Synchronous control device
4 ... Misoperation prevention device
5 ... Voltage / current sensor
6 ... Voltage / current sensor
7 ... Voltage sensor
8 ... Voltage sensor
9 ... Wireless repeater
10 ... Power generator for movement (mobile power supply car)
11 ... Phase rotation confirmation part
12 ... 1st AND circuit
13 ... Voltage difference confirmation part
14 ... Frequency difference confirmation part
15 ... Phase difference confirmation part
16: Second AND circuit
17 ... Electric power calculation part
18 ... Power display section
DESCRIPTION OF SYMBOLS 19 ... Wireless transmission device 20 ... Coil for electromagnet 21 ... Winding drum
30 ... push button switch

Claims (6)

Release the segment switch between the commercial power source and the load, and install a mobile power generator for the load after the released segment switch. For those that perform switching switching back,
A synchronous control device and an erroneous operation prevention device are attached to the power pole in which the section switch is arranged, and the synchronous control device includes at least a phase rotation confirmation unit, a voltage difference confirmation unit, a frequency difference confirmation unit, a phase difference confirmation unit, and current load power. An electric power calculation unit for calculating the operation and a wireless transmission device, the erroneous operation prevention device is provided with a winding drum for taking in the operation string of the section switch, a ratchet mechanism and an unlocking unit having an electromagnet, and the power generation for movement A wireless transmission device is provided in the device for transmitting and receiving signals to and from the synchronous control device, and a non-contact voltage / current sensor is attached to the commercial power supply side distribution line of the division switch, and the relief side distribution line of the division switch A non-contact voltage sensor is attached to the voltage sensor, and the detected voltage signals of the voltage / current sensor and the voltage sensor are sent to the phase rotation confirmation unit, voltage difference confirmation unit, frequency difference confirmation unit and phase difference confirmation unit of the synchronous control device. Each of these confirmation units exchanges signals with a mobile power generation device via a wireless transmission device to execute a synchronization operation, and when the voltage, frequency, and phase are within an allowable range, the erroneous operation prevention device It is configured to operate the sorting switch by sending a synchronization completion signal to the unlocking portion of the lock and releasing the locking, and pulling the sorting string of the sorting switch taken into the erroneous operation preventing device at the time of unlocking. Uninterruptible switching device between different power sources using a segmented switch. The uninterruptible power switching device between different power sources using the section switch according to claim 1, wherein a wireless repeater is interposed between the synchronous control device and the mobile power generator. 3. An uninterruptible switching device between different power sources using a section switch according to claim 1, wherein a voltage correction unit is provided in the voltage difference confirmation unit of the synchronous control device, and the detected voltage is corrected to a reference voltage. . An automatic load transfer / disconnection control unit is provided in the mobile power generation device, and an operation completion notification unit is provided in the erroneous operation prevention device, so that the mobile power generation device is notified when the operation of the division switch is completed. 4. The apparatus according to claim 1, wherein the apparatus takes in a load or releases a load via an automatic load transition / disconnection control unit based on a signal from the notification unit. Uninterruptible switching device between different power sources using a class switch. 5. The different power source using the section switch according to any one of claims 2 to 4, wherein an ID number is assigned to each of the wireless transmission device and the wireless repeater of the synchronous control device and the mobile power generation device. Uninterruptible switching device between. 6. The uninterruptible power switching device between different power sources using the section switch according to any one of claims 1 to 5, wherein the voltage / current sensor and the voltage sensor are non-contact type sensors.

Images