JP2010170783A - Electric power switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent beforehand an occurrence of an accident such as blackout, electric shock or the like during inspection and maintenance work by confirming a voltage condition of a system and opening and closing an electric power switch when one checks a functional work of the electric power switch. <P>SOLUTION: A voltage display unit 6a is provided on an electric power switch 1a, and when a push button 9 of the voltage display unit 6a is pushing-operated, the unit 6a displays whether a power source voltage is impressed on a primary side of A-phase power line 2, B-phase power line 3, C-phase power line 4 composing a three-phase power line, by presence/absence of lighting up of each of neon lamps 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power switch such as a disconnect switch, a circuit breaker, or a switch used in the field of power reception and distribution.

  Conventionally, as a power switch widely used in the power receiving and distribution field, a disconnect switch, a circuit breaker, a switch, and the like are known.

  The disconnector is a power device that opens and closes the voltage when the power circuit is unloaded. Basically, it cannot open or close the current, so it can be used for inspection, maintenance, repair, or remodeling. It is used for the purpose of making no voltage on the downstream side.

  The circuit breaker is a power device that opens and closes an electric circuit when the power circuit and the power device are operating normally, and is also simply referred to as a switch. Conventionally, a large circuit used for a power circuit or a power device is often called a switch, and a small device used for an electronic device is often called a switch.

Japanese Patent Laid-Open No. 3-205570

  By the way, in such a power distribution system, a high voltage of 22 to 66 kV is applied to the power line, and when performing maintenance and inspection work, it is necessary to open and close many power switches while checking the system state. .

  Conventionally, an auxiliary contact that operates in conjunction with the on / off of the main circuit contact constituting the power switch is provided, and the on / off state of the auxiliary contact is notified to the worker by turning on / off the lamp. There is a method for notifying whether or not a voltage is applied to the power line.

  However, in this method, when many power switches are opened and closed, it is difficult to determine whether or not a voltage is actually applied to the primary power line or the secondary power line of the main circuit contact. It was also a cause of power outages and electric shocks. In particular, when a large number of power switches are used for circuit branching and the circuit branch is complicated, the primary power line or the secondary power line is detected only by detecting the on / off state of the main circuit contact. The presence or absence of voltage was difficult to understand.

  On the other hand, a method for detecting the presence or absence of voltage by interposing a transformer in the power line is known as a method for detecting the voltage of the power line, but the transformer is large and expensive, and a large number of power switches are housed in the switchboard. It is not suitable for voltage detection.

  The present invention has been made in view of the above circumstances, and provides a power switch capable of preventing accidents such as power outages and electric shocks during inspection and maintenance by a worker with a simple device configuration. The purpose is to do.

  In order to achieve the above object, a first feature of the present invention is to provide a power switch that is inserted in a three-phase or single-phase power line and that cuts off / connects a power supply voltage supplied to the power line. And a detector for detecting the voltage on the power line on the primary side or the secondary side of the main circuit contact constituting the voltage detector, and a detection by the voltage detector provided at a predetermined location of the casing in which the power switch is accommodated. When the voltage is present, the lamp lit by the detected voltage is inserted between the voltage detector and the lamp, and when a display instruction operation is performed from the outside, between the voltage detector and the ground. An operation button that cuts off the circuit and guides the voltage detected by the voltage detector to the lamp, and the lamp is detected to have voltage by the voltage detector and the operation button is operated. Lights up to notify the presence of voltage Located in.

  According to a second aspect of the present invention, there is provided a main circuit constituting the power switch in a power switch that is inserted into a three-phase or single-phase power line and that cuts off / connects a power supply voltage supplied to the power line. When a voltage detector on the power line on the primary side or the secondary side of the contact detects a voltage on the power line and a predetermined location of the housing in which the power switch is housed, and the voltage detected by the voltage detector is present, And a lamp that is lit by this detection voltage.

  According to a third feature of the present invention, in addition to the first and second features, the power switch is housed in a switchboard constituting the power switch, and the lamp is operated on the door surface of the switchboard. The operation button is provided on the door surface of the switchboard so that a display instruction operation can be performed by an operator.

  According to the present invention, it is possible to prevent accidents such as power outages and electric shocks during inspection and maintenance by workers with a simple device configuration.

It is a lineblock diagram showing a 1st embodiment of a power switch concerning the present invention. It is a block diagram which shows 2nd Embodiment of the electric power switch which concerns on this invention. It is a block diagram which shows 3rd Embodiment of the electric power switch which concerns on this invention. It is a block diagram which shows 4th Embodiment of the electric power switch which concerns on this invention.

<First Embodiment>
FIG. 1 is a block diagram showing a first embodiment of a power switch according to the present invention.

  The power switch 1a shown in this figure is disposed in a switch housing (also referred to as a switchboard) 5a, and a switch CB inserted in each of the A-phase power line 2, the B-phase power line, and the C-phase power line 4. (Hereinafter also referred to as a main circuit contact), a voltage indicator 6a for displaying whether or not a power supply voltage is applied to the A phase power line 2, the B phase power line and the C phase power line 4 on the primary side of the switch CB. And.

  The voltage indicator 6a is connected to the primary side of the A-phase power line 2, the B-phase power line, and the C-phase power line 4 constituting the three-phase power line through the voltage detectors 7, and the A-phase detection voltage, the B-phase detection voltage, and the like. A terminal block 8 for capturing the C-phase detection voltage, a push button 9 provided on the door surface of the switch housing 5a and operated by an operator, and an A-phase power line provided on the door surface of the switch housing 5a. 2, the neon lamp 11 for each power line that is turned on when the presence of voltage is detected in the B phase power line and the C phase power line 4, and the lightning generated near the substation and the switching operation of the switch CB. A surge absorber 12 is provided for releasing the A-phase surge current, the B-phase surge current and the C-phase surge current generated in the detection voltage, the B-phase detection voltage and the C-phase detection voltage to the ground 10 side.

  When the push button 9 is not pressed by an operator, the A-phase detection voltage, the B-phase detection voltage, and the C-phase detection voltage taken into the terminal block 8 are released to the ground 10 to invalidate the voltage presence / absence display. . Further, when a pressing operation is performed by an operator, the voltage presence / absence display is made effective by preventing the A-phase detection voltage, the B-phase detection voltage, and the C-phase detection voltage taken into the terminal block 8 from escaping to the ground 10. .

  In the above configuration, when the push button 9 is not pressed by an operator or the like, the A phase detection voltage and the B phase detection voltage applied to the terminal block 8 through the path of the terminal block 8 → the push button 9 → the ground 10. And the phase C detection voltage is forcibly released to the ground 10. At this time, each neon lamp 11 is forcibly turned off.

  On the other hand, when the push button 9 is pressed by an operator or the like, the terminal block 8 and the ground 10 are disconnected, and the A phase detection voltage, the B phase detection voltage, and the C phase detection voltage escape to the ground 10. I am trying not to. At this time, when the presence of the voltage of the power line is detected by each voltage detector 7, the A-phase detection voltage, the B-phase detection voltage, and the C-phase detection voltage are applied to the terminal block 8 via each voltage detector 7. Then, current flows through the route of the terminal block 8 → the respective neon lamps 11 → the ground 10, and the respective neon lamps 11 are turned on. Thereby, it is displayed that the power supply voltage is applied to the primary side of the A-phase power line 2, the B-phase power line 3, and the C-phase power line 4 constituting the three-phase power line.

  Further, in the state where the push button 9 is being pushed by an operator or the like, when each voltage detector 7 detects no voltage on the power line, the terminal block 8 is connected to the terminal block 8 via each voltage detector 7. Phase detection voltage, B phase detection voltage, and C phase detection voltage are not applied. Therefore, since no current flows and each neon lamp 11 does not light, it can be seen that the power supply voltage is not applied to the primary side of the A-phase power line 2, the B-phase power line 3, and the C-phase power line 4.

  As described above, according to the first embodiment, the power switch 1a is provided with the voltage indicator 6a, and when the push button 9 of the voltage indicator 6a is pressed, the three-phase power line depends on whether each neon lamp 11 is lit. It is made to display whether the power supply voltage is applied to the primary side of A phase power line 2, B phase power line 3, and C phase power line which comprise. For this reason, when confirming the functional operation of the power switch 1a, the power switch 1a can be opened and closed while allowing a worker or the like to confirm the voltage state of the system. As a result, when an inspection or maintenance of the power receiving / distributing system is performed, it is possible to prevent unintended power outages and electric shock accidents to a load system that requires power supply. In addition, when there are no workers or the like, the neon lamps 11 can be turned off to extend the life of each neon lamp 11, and without using a large and expensive transformer for voltage detection. By using the voltage detector 7, the apparatus can be configured in a small size and at low cost.

<Second Embodiment>
FIG. 2 is a block diagram showing a second embodiment of the power switch according to the present invention. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals.

  The power switch 1b shown in this figure is different from the power switch 1a shown in FIG. 1 in that the push button 9 is deleted and each neon lamp 11 provided on the door surface of the switch housing 5b is turned on or not. In other words, whether or not the power supply voltage is applied to the primary side of the A-phase power line 2, the B-phase power line 3, and the C-phase power line 4 constituting the three-phase power line is always displayed.

  Thus, according to the second embodiment, whether or not the power supply voltage is applied to the primary side of the A-phase power line 2, the B-phase power line 3, and the C-phase power line 4 constituting the three-phase power line by each neon lamp. Is always displayed. For this reason, when performing work such as inspection and maintenance of the power distribution system, it is possible to prevent mistakes in grasping the system status due to forgetting to press the switch, etc., and unintended power outages to load systems that require power supply It is possible to prevent the occurrence of electric shock accidents of workers.

  As described above, in the first and second embodiments, the presence / absence of the voltage on the primary side of the switch CB is detected. However, the presence / absence of the voltage on the secondary side of the switch CB may be detected. In this case, the voltage indicators 6a and 6b may be connected to the downstream side (secondary side) of the switch CB via the voltage detector 7.

<Third Embodiment>
FIG. 3 is a configuration diagram showing a third embodiment of the power switch according to the present invention.

  The power switch 1c shown in this figure includes a switch CB that cuts off the single-phase power line 21, a switch housing 22c that houses the power switch 1c, and a single-phase provided on the door surface of the switch housing 22c. And a voltage indicator 23 a for displaying whether or not a voltage is applied to the power line 21.

  When the voltage indicator 23c is not pressed by a terminal block 25 that takes in the detected voltage via the voltage detector 24 connected to the primary side of the power line 21 that constitutes the three-phase power line, and a worker or the like, The detection voltage taken in the base 25 is released to the ground 27 side, the push button 26 for invalidating the voltage presence / absence display function, and the push button 26 are pressed by an operator or the like, and the detection voltage is transmitted via the terminal base 25. A surge that illuminates when the power is supplied and displays the presence or absence of voltage, and a surge that releases the surge current that occurs in the detected voltage to the ground 27 side due to lightning generated near the substation and switching operation of the switch CB. And an absorber 29.

  In the above configuration, when the push button 26 is not pressed by an operator or the like, the detection voltage applied to the terminal block 25 is forcibly grounded 27 through the path of the terminal block 25 → the push button 26 → the ground 27. The neon lamp 28 is forcibly turned off.

  Further, when the push button 26 is pressed by an operator or the like, the connection between the terminal block 25 and the ground 27 is cut off so that the detection voltage does not escape to the ground 27. As a result, when a detection voltage is applied to the terminal block 25 via the voltage detector 24, a current flows through the path of the terminal block 25 → the neon lamp 28 → the ground 27, the neon lamp 28 is turned on, and the power line 21 Is displayed on the primary side.

  On the other hand, when the push button 26 is pressed by an operator or the like, if the detection voltage is not applied to the terminal block 25 via the voltage detector 24, the terminal block 25 → the neon lamp 28 → the ground 27. No current flows through the path, and the neon lamp 28 is not lit. Thereby, it is displayed that the power supply voltage is not applied to the primary side of the power line 21.

  As described above, according to the third embodiment, the power switch 1c is provided with the voltage indicator 23c, and when the push button 26 of the voltage indicator 23c is pushed by the operator, the power line 21 is turned on depending on whether the neon lamp 28 is lit. It is made to display whether the power supply voltage is applied to the primary side. For this reason, when confirming the functional operation of the power switch 1c, the power switch 1c can be opened and closed while allowing a worker or the like to confirm the voltage state of the system. As a result, when an inspection or maintenance of the power receiving / distributing system is performed, it is possible to prevent unintended power outages and electric shock accidents to a load system that requires power supply. Further, when there are no workers, the neon lamp 28 can be turned off to extend the life of the neon lamp 28, and the voltage detection can be performed without using a large and expensive transformer for voltage detection. By using the insulator 24, the apparatus can be configured in a small and inexpensive manner.

<Fourth Embodiment>
FIG. 4 is a configuration diagram showing a fourth embodiment of the power switch according to the present invention. In addition, the same code | symbol is attached | subjected to the same component as FIG.

  The difference between the power switch 1d shown in the figure and the power switch 1c shown in FIG. 3 is that the push button 26 is deleted and the neon lamp 28 provided on the door surface of the switch housing 22d is lit or not. That is, whether or not a voltage is applied to the primary side of the single-phase power line 21 is always displayed.

  Thus, according to the fourth embodiment, whether or not a voltage is applied to the primary side of the single-phase power line 21 is always displayed by the neon lamp 28. For this reason, when checking and maintaining the power distribution system, it eliminates mistakes in grasping the system status caused by forgetting to press the switch, etc., and accidents such as unintentional power outages and electric shocks to load systems that require power supply voltage. It can be prevented in advance.

  As described above, in the third and fourth embodiments, the presence / absence of the voltage on the primary side of the switch CB (main circuit contact) is detected to always display whether or not the voltage is applied to the primary side. However, the presence / absence of a voltage on the secondary side may be detected to always display whether or not a voltage is applied to the secondary side. In this case, the voltage indicators 6a and 6b may be connected to the downstream side (secondary side) of the switch CB via the voltage detector 7.

1a to 1d: Power switch 2: Phase A power line 3: Phase B power line 4: Phase C power line 5a, 5b, 22c, 22d: Switch housing 6a, 6b: Voltage display 7, 24: Voltage detector 8, 25: Terminal block 9, 26: Push button (operation button)
10, 27: Earth 11, 28: Neon lamp (lamp)
12, 29: Surge absorber 21: Power line CB: Switch (main circuit contact)

Claims (3)

In a power switch that is inserted into a three-phase or single-phase power line and cuts off / connects a power supply voltage supplied to the power line,
A voltage detector for detecting the voltage on the power line on the primary side or secondary side of the main circuit contact constituting the power switch;
A lamp that is provided at a predetermined location of a housing in which the power switch is accommodated and that is lit by the detection voltage when the detection voltage by the voltage detector is present;
When a display instruction operation is inserted from the outside between the voltage detector and the lamp, the circuit between the voltage detector and the ground is cut off, and the voltage detected by the voltage detector is An operation button that leads to the lamp, and
The lamp is lit when a voltage is detected by the voltage detector and the operation button is operated to notify the presence of voltage.
A power switch characterized by that. In a power switch that is inserted into a three-phase or single-phase power line and cuts off / connects a power supply voltage supplied to the power line,
A voltage detector for detecting the voltage on the power line on the primary side or secondary side of the main circuit contact constituting the power switch;
A lamp that is provided at a predetermined location of a housing in which the power switch is accommodated and that is lit by the detection voltage when the detection voltage by the voltage detector is present;
A power switch comprising: The power switch according to claim 1 or 2,
The power switch is housed in a switchboard that constitutes the power switch, the lamp is provided on the door surface of the switchboard so as to notify the operator, and the operation button is displayed on the door surface of the switchboard by the worker. Instruction operation is provided.
A power switch characterized by that.

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