JPH07274414A - Instantaneous power switching device - Google Patents

Abstract

PURPOSE:To make it possible to perform a switching from an existing power source to a new power source without power service interruption by connecting a shunt equipped with an reactor for suppressing a rush current and a contactless switch being conductive after receiving a conducting command signal between newly installed power supply terminals and load terminals. CONSTITUTION:A first switchgear 15 connected between an existing power terminal 2 and a load terminal 4 is provided, and connected state between these terminals 2 and 4 are opened. Also, a second switchgear 16 is connected between a newly installed power supply terminals 3 and the load terminals 4, and these terminals 3 and 4 are connected together after the make and break of the first switchgear. Moreover, a contactless switch 17, a rush current suppressing reactor 18 and a third switchgear 19 are arranged in parallel to the second switchgear 16 between the newly installed power supply terminals 3 and the load terminals 4 thereby forming a shunt. By doing this, the switching from the existing power supply to the new power supply can be performed without power service interruption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power instantaneous switching device used when switching an existing power source to a new power source.

[0002]

2. Description of the Related Art In low-voltage distribution line construction, switching work from an existing power source to a new power source is currently performed in a power-off state.

[0003]

[Technical problem to be solved] However, in recent years, due to the sophistication and diversification of electric power demand, a social environment in which it is difficult to obtain power interruption (power outage) for construction work is becoming. For this reason, it is necessary to perform the power switching work without interruption.

Except for the above-mentioned conventional problems, the present invention enables switching from an existing power source to a new power source without interruption, and makes it possible to remarkably increase the reliability of supply to consumers. It is intended to provide an instantaneous power switching device.

[0005]

A power instantaneous switching device according to the present invention has an existing power source terminal for connecting to an existing power source and a new power source terminal for connecting to a new power source in a case. And a load terminal for connecting to a power load, and a first switch for opening the connection state between the existing power supply terminal and the load terminal is connected. On the other hand, between the new power supply terminal and the load terminal, there is connected a second switch for connecting both terminals after the opening of the first switch, and further, The load terminal is connected to a conduction control circuit that detects a voltage drop at the terminal and outputs a conduction command signal for the contactless switch, and connects between the new power source terminal and the load terminal. Is a contactless switch that is made conductive by receiving the above-mentioned conduction command signal, and Shunt and a reactor for current suppression is than connected in parallel state and the second switch.

[0006]

[Operation] When the switch between the existing power supply terminal and the load terminal is opened, the voltage drop at the load terminal is detected by the conduction control circuit, and the contactless switch between the new power supply terminal and the load terminal. Conducts immediately and with a small amount of inrush current. As a result, the load terminal is switched from the power supply state of the existing power supply terminal to the load terminal to the power supply state of the new power supply terminal to the load terminal without a power failure.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Momentary power switching device A shown in FIGS. 1 and 2.
, 1 indicates a case. In the members attached to the case 1, 2 is an existing power supply terminal, 3 is a new power supply terminal, 4 is a load terminal, and each has three terminal fittings for three phases. Core cable (Three-core cable in the present specification means 3-core SV cable, 3-core DV cable, 3-core VV cable, etc.,
(Meaning a cable with three cores). Reference numeral 5 is a ground terminal, 6 is a display and operation panel, and is provided with various indicator lights and switches for operation described later. Next, 7 is a connecting cable, 3
A core cable is used, and one end is the terminal 2, 3 or 4
And a jumper metal fitting 8 is attached to the other end for each core wire. Reference numeral 9 is a display provided for distinguishing each line, and 10 is a holding hook. The connection cable 7 is provided in three sets for the three terminals 2, 3 and 4. Next, 11 is a remote control unit which is provided as necessary, and which allows the operation of the power instantaneous switching device A to be performed from a distant point. The same display and operation panel as the panel 6 is provided. It is equipped with the remote control cable 12 and the power instantaneous switching device A is provided.
Connected to. 13 is a holding hook.

Next, the circuit mechanism provided inside the case 1 in the power instantaneous switching device A will be described.
First, in FIG. 3 showing the connection circuit mechanism among the existing power supply terminal 2, the new power supply terminal 3 and the load terminal 4, reference numeral 15 is a first connection between the existing power supply terminal 2 and the load terminal 4. This is a switch which opens the connection state between the terminals 2 and 4, and a contact of a known electromagnetic switch is used. Reference numeral 16 is a second switch connected between the new power supply terminal 3 and the load terminal 4, and after the first switch 15 is opened, the terminals 3 and 4 are connected to each other. The contact of a known electromagnetic switch is used.

Reference numerals 17, 18 and 19 are provided between the new power supply terminal 3 and the load terminal 4 in parallel with the second switch 16 to form a shunt. Is a contactless switch, and a triac is used, but a thyristor connected in antiparallel may be used. 18 is a reactor for suppressing inrush current, 19 is a third switch connected in series with the contactless switch 17, and in the normal state the contactless switch 17
The load terminal 4 and the load terminal 4 are separated from each other. These are connected as shown in FIG. 20 is a circuit breaker (or fuse), when installing the jumper metal fitting 8,
In the case of an accidental short circuit between phases, the load (consumer) is immediately disconnected and opened to disconnect the load (consumer) from the respective terminals for the three-phase three-wire and the three-phase four-wire.

Next, referring to FIG. 4 showing the control circuit 21, the control circuit 21 includes a confirmation display circuit 22 for detecting an electromotive phase, a bypass control circuit 23, a switching control circuit 24, and a power-off circuit 29. Consists of. Further, the switching control circuit 24, the switching operation unit 25,
Closing preparation circuit 26, opening control circuit 27, continuity control circuit 28
It consists of and.

The confirmation display circuit 22 is constituted by connecting well-known members indicated by reference numerals 31 to 45 and well-known logic circuits respectively indicated by MIL symbols as shown in the drawing. 31 to 33 are voltage detection circuits, 34 and 35 are phase detection circuits, 36 to 38 are voltage detection indicators, 39 and 40 are phase detection indicators, 41 and 42 are lamp blinking oscillators, 43 is a buzzer, 44 Is a bypass completion indicator light, and 45 is a switching completion indicator light. Reference numerals 49a and 49b denote contacts which are controlled to be opened and closed by the control coil 49 of the first switch, which will be described later, and 58a denotes contacts which are controlled to be opened and closed by the control coil 58 of the second switch. Next, the bypass control circuit 23 includes a manual switch (push button switch) 47 for forming a bypass circuit, a flip-flop circuit 48, a control coil (a coil of an electromagnetic switch) 49 for the first switch, and a MIL symbol. The well-known logic circuit shown is connected as shown in the drawing.

Next, in the switching control circuit 24, the switching operation section 25 has a manual switch (push button switch) 51 for switching operation.
And a well-known logic circuit are connected as shown in the drawing. The closing preparation circuit 26 includes a flip-flop circuit 52 and a control coil (a coil of an electromagnetic switch) 53 for the third switch.
And a well-known logic circuit shown in the figure. The opening control circuit 27 includes a contact 53 that is controlled to open / close by the coil 53.
a and a well-known logic circuit shown in the figure. The continuity control circuit 28 detects a voltage drop at the load terminal 4 and outputs a continuity command signal for the non-contact switch, and a known power failure detection circuit 55 and a flip-flop circuit 56.
, A triac drive circuit 57, a control coil (coil of an electromagnetic switch) 58 for the second switch, and a well-known logic circuit shown in the figure.

Next, the energization cutoff circuit 29 is composed of a manual switch (push button switch) 59 for energization cutoff operation and a well-known logic circuit shown in the figure.

Next, using the above-mentioned apparatus A, three-phase three-wire to three-phase
The work method and the operation of the apparatus A when the power is switched to the phase 4 wire will be described with reference to FIGS. 5 to 8. In addition, FIG. 5 shows a three-phase three-wire type power source to a three-phase four
The figure shows an example in the case of urban construction in which the power source is switched to a linear power source. In the figure, 60 is a light and power consumer, 61-
Reference numeral 64 is an existing member, 61 is a high-voltage distribution line, 62 is a three-phase three-wire power transformer, 63 is a low-voltage distribution line, and 64 is a service line. 66 to 75 are new members, 66 is a high voltage main cable, 67
Is a high-voltage pull-down cable, 68 is a three-phase 4-wire transformer that is commonly used for lighting, 69 is a low-voltage pull-down cable (one of four cores is a ground wire), 70 is a branch box, 71 is a low-voltage trunk cable (4 Of the core
(1 core is a ground wire), 72 is a power supply drop box, 73 is a power supply drop wire (3-core cable), 74 is an electric light drop box, and 75 is a light drop line.

Further, FIG. 6 shows the state of connection in the vicinity of the service entrance of the customer 60. In the figure, 76 is the customer's building, 77 is the existing power supply, and is constructed with the service line 64. . Reference numeral 78 denotes a new power supply, which is configured with the lead-in wire 73. The service line 64 and service line 73 are constructed by a well-known method shown in FIGS. 9 and 14, for example.
Retained at 76. 80 indicates a power load. In this, 81 is a lead-in wire, which is connected to the lead-in wire 64 by a connector 82 for connection. Reference numeral 83 indicates indoor wiring, and reference numeral 84 indicates a power load such as a motor. The connector 82 may be the bolt type connector shown in FIGS.
The vise type shown in FIG. 13 is used, and these connectors are covered with the insulating volcon cover shown in FIG.

Next, a working method will be described. First, the switching device A is installed near the power inlet of the customer 60 who is scheduled to switch while power is being transmitted by the existing 3-phase 3-wire power source. Next, 2 of the newly installed three-phase, four-wire type shared lights
Branch box 70 from the terminal on the next side, and further through drop box 72, drop line 73
Is extended to the vicinity of the entrance and is retained at the customer's shop side 76.
However, the leading end of the service wire 73 (3-core cable) is taped and insulated.

After the above preparation, the terminals 2, 3, 4 of the switching device A are connected. That is, first the connector
The switching device A is connected to the incoming line 64 on the transformer side of 82.
The connection cable 7 attached to the existing power supply terminal 2 is connected for each line. Further, the connecting cable 7 also attached to the load terminal 4 is connected to the lead-in wiring 81 on the load side of the connector 82. That is, the existing power supply terminal 2 and the load terminal 4 are connected in parallel to the connection connector 82. These connections are made by tightening with a jumper metal fitting 8 provided at the tip of each connection cable 7. Next, the insulating tape of the lead-in wire 73 on the three-phase, four-wire side that has already been held near the lead-in port is peeled off, and the connecting cable 7 attached to the new power supply terminal 3 of the switching device A is connected.
Similar to the above, the connection is made with a jumper metal fitting at the end of the cable. Then, when a ground wire is connected to the ground terminal 5 of the main body case 1, the connection of the device is completed and the preparation for switching is completed. This work is omitted if the ground terminal 5 is not provided.

As described above, each terminal 2, 3, of the switching device A is
When the connection of 4 is completed, the power supply of the device is turned on (the power supply of the device is turned on by connecting the terminal 2 for the existing power supply of 3-phase 3-wire), and the circuit of FIG. 4 operates as follows. . That is, whether or not each terminal is charged is determined by the voltage detection circuits 31, 32, and 33, and when each terminal is in a charged state for all three lines, the indicator lamp 3
6,37,38 lights up respectively. Further, the phase detection of the existing power supply terminal 2 and the load terminal 4 is performed by the phase detection circuit 34, and when all three phases are in phase, an output occurs at point (a) in FIG. Moreover, the phase detection circuit 35 detects the phase detection of the newly installed power supply terminal 3 and the load terminal 4.
The output occurs at point (b) when the three phases are in phase. Further, the phase detection determination output of the phase detection circuit 34 is inverted by the inverting circuit 34a, and the phase detection determination output of the phase detection circuit 35 is inverted by the inverting circuit 35a. Furthermore, when both the existing power supply terminal 2 and the load terminal 4 have voltage detection, an output occurs at point (c), and both the new power supply terminal 3 and load terminal 4 have voltage detection. Has an output at point (d).

As a result of the above operation, in the case where both the existing power supply terminal 2 and the load terminal 4 have the voltage detection and the three-phase common phase, the output occurs at the point (e), and the new power supply terminal 3 When both the load terminal 4 and the load terminal 4 have the voltage detection and the three-phase common phase, an output occurs at the point (f). In the above case, even if the existing power supply terminal 2 or load terminal 4 has no phase,
When the phases are different, an output is generated at the point (g) and the buzzer 43 sounds. Further, in the above case, when the new power supply terminal 3 or the load terminal 4 is in one phase and there is no voltage detection, or when there is one phase or another phase, an output occurs at the point (h). Furthermore, in the above case, if the existing power supply terminal 2 and load terminal 4 are all detected and there is a different phase for each of the three phases, the cycle set by the oscillator 41 at point (i) for that phase. Signal is output and the phase detection indicator lamp 39 for that phase blinks. Similarly, when the new power supply terminal 3 and the load terminal 4 all have the voltage detection and there is a different phase for each of the three phases, a signal of the cycle set by the oscillator 42 is output at the point (j) for that phase. It is output, and the phase detection indicator lamp 40 for that phase blinks.

When it is confirmed by the indicators 36 to 40 that the power detection and phase detection of the existing power supply terminal 2 and the load terminal 4 are all proper, the switch 47 of the bypass control circuit 23 is operated. Then, the coil 49 is excited by the signal from the flip-flop circuit 48, and the first switch 15 in FIG.
Is turned on. The contact 49b of the confirmation display circuit 22 is closed, the bypass completion indicator lamp 44 is turned on, and the contact 49a is closed.

In this state, the connector 82 shown in FIG. 6 is removed. Then, the power source that has been transmitted from the service line 64 to the service port wiring 81 via the connector 82 is the above service line.
Power is transmitted from 64 to the service wire 81 via the connection cable 7, the existing power supply terminal 2 in the switching device A, the first switch 15, the circuit breaker 20 and the load terminal 4, and the connection cable 7. Like

As described above, the coil 49 is excited to contact the contact 49.
When a is closed, an output occurs at the point (k) when there is a single phase in the new power supply terminal 3 and the load terminal 4 even if there is no detection or even in one phase, and the buzzer 43 turns on. Ring.

Next, as described above, it is confirmed that all of the new power source terminal 3 and the load terminal 4 are normal in the detection phase, and the bypass completion indicator lamp 44 is turned on to make the first detection.
If it is confirmed that the switch 15 of
Close the switch 51 of. Then, the coil 53 is excited by the output from the flip-flop circuit 52 of the closing preparation circuit 26, and the third switch 19 in FIG. 3 is turned on.
When the coil 53 is excited as described above, the open control circuit 27
The contact 53a at is closed, a signal is applied to the reset terminal of the flip-flop circuit 48 in the bypass control circuit 23, and the flip-flop circuit 48 is reset. As a result, the excitation of the coil 49 is released, and the first switch 15 in FIG. 3 is opened. That is, the load terminal 4 is in a power failure state.

When the load terminal 4 is in the power failure state as described above, the voltage thereat is as shown in FIG.
It gradually decreases from the opening point of 15 (as shown in FIG. 6, since a power load 84 such as a motor is connected to the indoor wiring 83 of the customer, the back electromotive force of the power load 84 causes the load terminal 4 to move.
Voltage gradually decreases). When the voltage drop occurs as described above, the power failure detection circuit 55 of the continuity control circuit 28 in FIG.
Detects it and produces an output signal. The above-mentioned detection is performed, for example, when the voltage of the load terminal 4 falls below 75% (150V) with respect to the specified voltage (200V) as shown in FIG. When the power failure detection circuit 55 produces an output as described above, the triac drive circuit 57 is activated by the output from the flip-flop circuit 56, and a conduction command signal is given to the contactless switch 17 of FIG.

The contactless switch 17 receives the conduction command signal and immediately becomes conductive, and the contactless switch 17 establishes a conduction state between the new power supply terminal 3 and the load terminal 4. In such a state, the service line 73 in FIG.
The power that arrives at the connection cable 7, the new power supply terminal 3 in the switching device A, the contactless switch 17, the reactor 1
Power is transmitted to the inlet wiring 81 via the third switch 19, the circuit breaker 20, the load terminal 4, and the connection cable 7.
In this case, the presence of the reactor 18 suppresses the inrush current, and the non-contact switch 17 exerts an uninterruptible effect without being damaged even with a small capacity. First switch 15 as described above
The time from when the switch is opened to when the contactless switch 17 is turned on is extremely short, for example, 10 milliseconds or less. Therefore, even if a device with a built-in microcomputer is connected to the customer's indoor wiring, no substantial power failure occurs for them. The above flip-flop circuit 56
Is also applied to the coil 58 to excite the coil 58. As a result, the second switch 16 shown in FIG.
Is immediately turned on. Since the second switch is a mechanical contact, the second switch is turned on after the conduction of the contactless switch 17 (with a mechanical delay).

When the second switch 16 is turned on as described above, thereafter, the new power supply terminal 3 to the load terminal 4 are connected.
Power is supplied to the circuit through the second switch 16, and the contactless switch 17 is cut off (switch).
16 contact resistance << triac conduction resistance). In this state, since the contact 58a is made conductive by the excitation of the coil 58, the switching completion indicator lamp 45 is turned on and it is indicated that the switching is completed.

When the completion of switching is confirmed as described above, the lead-in wire 73 and the lead-in wiring 81 are connected by a connector in FIG. When the connection is completed, the switch 59 in the power-off circuit 29 of FIG. 4 is turned on. Then, the flip-flop circuits 52 and 56 are both reset, the excitation of the coils 53 and 58 is released, and the switches 19 and 16 are opened. In this state, finally, the connection cable 7 attached to each terminal 2, 3, 4 of the switching device A is removed from the service lines 64, 73 and the service port wiring 81 of FIG. By removing A, all switching work is completed.

Next, the operation of the switching device will be described with reference to the time chart of FIG. First, when the switch 47 for forming the bypass circuit is turned on, the first switch 15 is closed. Next, when the switch 51 for switching operation is turned on, the third
The switch 19 is closed, and then the first switch 15 is opened. When the first switch 15 is opened and the voltage of the load terminal 4 starts to drop as described above, the contactless switch 17 is turned on by the operation of the conduction control circuit 28 as described above. In the figure, T1 is within 10 milliseconds as described above. After the contactless switch 17 is turned on, the second switch 16 is turned on. The difference between the times T1 and T2 is due to the mechanical delay of the second switch 16. After that, when the switch 59 for turning off the power is turned on, the second and third operations are performed.
The switches 16 and 19 of are opened.

Next, a ninth example showing a known retaining state of the service wire
In the figure, 86 is a rack fixed to the wall of the building 76, 87 is a low pressure insulator, 88 is a messenger wire, and 89 is a winding clip. The lead-in wire 64 (73) is a 3-core SV cable, and the lead-in wire 81 is a 3-core VV cable.

Next, in FIGS. 10 and 11 showing the connection state of the electric wire by the bolt type connector 82, 64a shows one line of the lead-in wire 64, 81a shows one line of the lead-in port wiring 81, which are bolt type connectors. Connected at 82 as shown. In the bolt-type connector 82, 90 is a main body, 91 is a tightening nut, and 92 is a connector guide.

Next, FIGS. 12 and 13 show the connection state of the electric wires 64a and 81a by the vise type connector 93. As shown in FIG. In the connector 93, 94 is a main body and 95 is a tightening bolt.

Next, FIG. 14 shows an example in which the lead wire is held in a different state. In the drawing, 96 is a retracting hook, 96a is a connecting hook, 96b is a hook mounting screw, and 97 is a flat insulator for anchoring. Also, as the lead-in wire 64, three twists D
A V electric wire is used and is connected to the lead-in wiring 81 (3-core VV cable) via a well-known connector. 98 indicates a demarcation tube, and 99 indicates a volcon cover.

[0033]

As described above, according to the present invention, the load 80
Power supply to the existing power supply 77 to the new power supply 78
When switching to the supply from the above, the above switching can be performed by opening the first switch 15 and closing the second switch 16, and when the first switch 15 is opened, the load terminal 4 When the voltage starts to decrease, the continuity control circuit 28 detects it and issues a continuity command signal for the contactless switch 17, and the signal causes the contactless switch 17 to conduct immediately, and the contactless switch 17 newly establishes a new signal. It is characterized in that the electrical connection between the power supply terminal 3 and the load terminal 4 is achieved with the reactor 18 suppressing the inrush current. This means that there is virtually no interruption of power supply on the load 80 side, that is, switching from the existing power supply to the new power supply is performed in the uninterrupted state. There is an effect that the reliability of the power supply to

[Brief description of drawings]

FIG. 1 is a front view of a power instantaneous switching device.

FIG. 2 is a side view of a power instantaneous switching device.

FIG. 3 is a circuit diagram showing a connection circuit mechanism of a power instantaneous switching device.

FIG. 4 is a circuit diagram showing a control circuit of a power instantaneous switching device.

FIG. 5 is a circuit diagram for explaining three-phase three-wire type power distribution and three-phase four-wire type power distribution.

FIG. 6 is a connection diagram for explaining a usage state of the power instantaneous switching device.

FIG. 7 is a time chart for explaining the operation of the power instantaneous switching device.

FIG. 8 is a diagram showing a voltage change of a load terminal.

FIG. 9 is a diagram showing a retaining state of a service wire.

FIG. 10 is a front view showing a connection state of electric wires by a bolt type connector.

FIG. 11 is a partially cutaway side view showing a connection state of electric wires by a bolt type connector.

FIG. 12 is a front view showing a connection state of electric wires by a vise type connector.

FIG. 13 is a partially cutaway side view showing a connection state of electric wires by a vise type connector.

FIG. 14 is a diagram showing an example in which a lead wire is held in a different state.

[Explanation of symbols]

 1 ... Case 2 ... Existing power supply terminal 3 ... New power supply terminal 4 ... Load terminal 15 ... First switch 16 ... Second switch 17 ... Solid state switch 28 ... Continuity control circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinho Uchida 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Co., Inc. (72) Inventor Tetsuro Kumagai 4-1-1-18, Yushima, Bunkyo-ku, Tokyo Stocks Incorporated KANDENKO (72) Inventor Masuda Sasada 35 Fukanma, Nagakusa-cho, Obu-shi 35 Technical Research Institute of High Voltage Electric Co., Ltd.

Claims (1)

[Claims] 1. The case is provided with an existing power supply terminal for connecting to an existing power supply, a new power supply terminal for connecting to a new power supply, and a load terminal for connecting to a power load. , A first switch is connected between the existing power supply terminal and the load terminal to open the connection state between the two, and between the new power supply terminal and the load terminal Is connected to a second switch for connecting both terminals after opening the first switch, and further, the load terminal is a contactless switch for detecting a voltage drop at the terminal. A continuity control circuit for outputting the continuity command signal is connected, and between the new power supply terminal and the load terminal,
A power supply characterized in that a shunt equipped with a contactless switch adapted to receive the conduction command signal so as to conduct electricity and a reactor for suppressing an inrush current is connected in parallel with the second switch. Instant switching device for.