JP2001093389A - Failure-in-removal preventing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a failure-in-removal preventing unit superior in safety and reliability and capable of preventing failure in removal of grounding equipment and a tester due to experience or carelessness to cause troubles and ensuring sufficient safety of a worker. SOLUTION: As long as at least one sensor portion 30 is mounted on grounding equipment or a tester, a display 23 is lit and an interlock signal continues to output. With the interlock signal continuing to output, a disconnector 3 is prohibited from closing operation and a power line is forcibly cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit for preventing the user from forgetting to remove the power supply unit, which is used in power maintenance work.

[0002]

2. Description of the Related Art In the event of a legal inspection or a power outage of a power receiving facility, a so-called human error may occur in a facility accident due to a so-called human error, such as a worker forgetting to remove a grounding device or a test device due to "getting used" or "inadvertent". .

[0003]

Since such equipment accidents lead to personal injury, it is necessary to take sufficient measures to prevent the accidents.

[0004] The present invention has been made in view of the above circumstances,
The purpose is to prevent accidental forgetting to remove grounding equipment, test equipment, etc. due to "getting used" or "inadvertently", thereby preventing accidents and ensuring sufficient safety of workers. It is an object of the present invention to provide a safe and reliable removal prevention unit which can be removed.

[0005]

According to a first aspect of the present invention, there is provided a unit for preventing the user from forgetting to remove the unit. The unit is connected to the unit body, and can be freely attached to and detached from an article, and detects the attachment and detachment. A sensor unit having a function, an alarm derived from the unit main body, and a line for the power system which has a connection terminal incorporated in the power system and has an interlock signal input from the connection terminal. And a control circuit section that continues the cutoff state until the input of the interlock signal is released, and a lead wire that is derived from the unit body and that can be freely connected to and disconnected from a connection terminal of the control circuit section. And a control unit provided in the unit main body. A control unit that detects the mounting / removal state of the sensor unit based on the detection of the sensor unit, and operates the annunciator until the detection unit detects the mounting state after detecting the mounting state; and Control means for outputting an interlock signal via the lead wire.

According to a second aspect of the present invention, the unit for preventing removal is connected to the unit main body via a connector which can be freely connected and disconnected, and has a mechanism which can be freely attached to and detached from an article. A plurality of sensor units having switches responsive to the mounting and dismounting thereof, an alarm derived from the unit main body, and an interface incorporated in a power system and having a connection terminal, and an interface input from the connection terminal. A control circuit unit that cuts off the power system line in response to the lock signal and continues the cutoff state until the input of the interlock signal is released, and a connection terminal of the control circuit unit that is derived from the unit body and is connected to the control circuit unit. And a control unit provided on the unit body. The control unit, based on the state of the switch of each sensor unit, a detecting unit that detects the state of attachment and detachment of each sensor unit,
Control means for operating the annunciator and outputting an interlock signal via the lead wire until the detection means detects the mounting state of each sensor section and thereafter detects the removal state of all sensor sections. .

According to a third aspect of the present invention, the unit for preventing forgetting to be removed has a mechanism which is connected to the unit body via a connector which can be connected and disconnected, and which can be freely attached to and detached from an article. A plurality of sensor units having switches responsive to the mounting and dismounting thereof, an alarm derived from the unit main body, and an interface incorporated in a power system and having a connection terminal, and an interface input from the connection terminal. A control circuit unit that cuts off the power system line in response to the lock signal and continues the cutoff state until the input of the interlock signal is released, and a connection terminal of the control circuit unit that is derived from the unit body and is connected to the control circuit unit. A lead wire that can be freely connected to and disconnected from the unit, a timer and alarm means provided on the unit main body, And a vignetting control unit. The control unit, based on the state of the switch of each sensor unit, a detecting unit that detects the state of attachment and detachment of each sensor unit,
Control means for operating the annunciator and outputting an interlock signal via the lead wire until the detection means detects the mounting state of each sensor part and detects the removal state of all the sensor parts; and Detection means for detecting connection / disconnection of each of the sensor units to / from the unit body; control means for operating the timer when the detection means detects disconnection of the once connected sensor unit; and Control means for operating the alarm means when a predetermined time has been reached.

According to a fourth aspect of the present invention, there is provided a unit for preventing removal, wherein the sensor unit has an opening / closing mechanism for performing the mounting by sandwiching the sensor in any one of the first, second and third aspects of the invention. The inner periphery of the opening / closing mechanism is covered with a paper-like insulator.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a high-voltage power receiving board 2 is connected to a commercial AC power supply 1. High-voltage receiving board 2
The power supply line is provided with a disconnector (disconnector) 3, a circuit breaker (CB) 4, and a protective relay 5 in order, and supplies power to a plurality of high-voltage branch boards 6. A load 7 is connected to each high-pressure branch board 6.

The disconnector (disconnector) 3 is used for opening and closing manually by turning off the power supply line after the power supply line has no voltage, and is opened by an operator at the start of the work such as legal inspection work or construction power outage. The closing operation is performed by the worker at the end of the work. The circuit breaker 4 is
This is for shutting off or shutting off the power supply line when an overcurrent flows, and responds to the operation output of the protection relay 5. The protection relay 5 operates when a current (overcurrent) equal to or more than a predetermined value flows through the power supply line.

In such an electric power system, a control circuit unit 10 that can be opened and closed by a lock operation key is incorporated in the disc 3 of the high-voltage power receiving panel 2. Control circuit section 10
Has a connection terminal 10a and a relay 11, the relay contact 11b of the relay 11 is inserted into and connected to the disconnector 3, and the relay 11 is energized in response to an interlock signal input from the connection terminal 10a. As a result, the relay contact 11b is opened to forcibly cut off the disconnector 3, and the cutoff state is continued until the input of the interlock signal is released.

Reference numeral 20 denotes a main body of the unit for preventing forgetting to be removed.
There are a plurality of connectors 21, 21,... On the outer peripheral surface of the housing. A plurality of sensor units 30 corresponding to these connectors are prepared, and a connector 31a is provided at the tip of a cable 31 derived from each sensor unit 30. The connector 31a can be freely connected to and disconnected from each of the connectors 21 described above.

Each sensor unit 30 has a mechanism that can be freely attached to and detached from an article, and has a switch that responds to the attachment and detachment. Figure 2 shows the specific configuration
Shown in

As shown in FIG. 2, one end of each of the frame members 32 and 33 is rotatably connected to each other by a hinge 34, and an opening / closing mechanism for mounting the product on a cable, for example, by sandwiching it is formed. A receiving portion 32a is formed at the other end of the frame-shaped member 32, and a contact portion 33a that is in contact with the receiving portion 32a is formed at the other end of the frame-shaped member 33. Further, an elastic lock member 35 is attached to the contact portion 33a, and an opening 32b is formed in the receiving portion 32a.

When the frame members 32 and 33 are closed, the distal end 35a of the elastic lock member 35 is elastically deformed while the opening 3 is closed.
2b, and the closed state of the frame members 32, 33 is locked by this fitting. At the time of this closing, the frame-shaped member 32,
A space 36 for holding a cable or the like between the members 33 is secured. When the frame members 32 and 33 are opened, the distal end 35a of the elastic lock member 35 is elastically deformed and the opening 32 is opened.
b.

The magnetic sensor 4 is provided inside the frame member 32.
1a is attached, and a magnetic body 41b is provided inside the frame-shaped member 33.
Is installed. The magnetic sensor 41a and the magnetic body 4
1b constitutes a magnetic switch for detecting opening / closing of the frame members 32 and 33, that is, attachment and detachment to / from the article. The base end of the cable 31 is connected to the magnetic sensor 41a, and the cable 31 is led out along the frame-shaped member 32.

Further, an insulator, a so-called Nomex 37, is provided on the inner periphery of the frame members 32 and 33 and at a position covering the magnetic sensor 41a. The coating using the Nomex 37 prevents a short circuit accident between the frame members 32 and 33 and a sandwiched object such as a cable. The base end and the end of the cable 31 are protected by the elastic tubes 38, respectively.

Further, the cable 22
An indicator, for example, a display 23 is led out from the unit main body 20, and a lead wire 24 is led out from the unit main body 20.
The display 23 has a display panel on which the word “working” is written, and illuminates a built-in light emitter, for example, a light-emitting diode, to illuminate the display panel. The characters “working” emerge from the transmitted illumination. At the end of the lead wire 24, there is provided a terminal 24a which can be freely connected to and disconnected from the connection terminal 10a of the control circuit section 10.

In the unit body 20, a control unit 25, an alarm means such as a buzzer 26, a battery power supply 28 serving as an operation power supply, and a timer 27 are mounted. Then, the control unit 25 performs the following [1] to
[5] means is provided. [1] First detection means for detecting the state of attachment / detachment of each sensor unit 30 based on the state of a switch of each sensor unit 30.

[2] The display 23 is caused to emit light from the time when the first detecting means detects the state of attachment of each sensor unit 30 until the state of removal of all the sensor units 30 is detected. Control means for outputting a lock signal.

[3] Each connector 21 of the unit body 20
Second detecting means for detecting connection / disconnection of each of the sensor units 30 with respect to.

[4] Control means for operating the timer 27 when the second detecting means detects the disconnection of the once connected sensor unit 30.

[5] Control means for sounding the buzzer 26 as an alarm means and blinking the display 23 when the time count (time count t) of the timer 27 reaches a predetermined time (ts).

Next, the operation will be described with reference to the flowchart of FIG. At the time of legal inspection work of the electric power system or construction power failure, the operator opens the disconnector 3 of the high-voltage power receiving panel 2 in advance and cuts off the power supply line. Also, for safety, a grounding device is attached to a work target location on the power supply line.

Then, each sensor section 3 is attached to the unit body 20.
A cable 31 is connected by a connector, and each sensor section 30 is attached to the above-mentioned grounding device, a grounding device tester, a measuring device, and the like. With this attachment, each sensor unit 3
The 0 magnetic switch is turned on. The display 23 is installed at a visible position near the worker. Furthermore, the terminal 24 at the tip of the lead wire 24 led out from the unit body 20
a is connected to the connection terminal 10 a of the control circuit unit 10 in the high-voltage power receiving board 2.

When all the sensor units 30 are connected to the unit body 20 by connectors (YES in step 101), and all the sensor units 30 are attached to the object and their magnetic switches are turned on (YES in step 102, step 103). NO), the interlock signal is continuously output via the lead wire 24, the display 23 is turned on, and the character of "working" is displayed by the transparent illumination (step 104).

The interlock signal output from the lead wire 24 is supplied to the control circuit section 10 of the high-voltage power receiving panel 2, whereby the relay contact 11b of the disc 3 is opened.
This opening operation forcibly shuts off the power supply line.

When the operation is completed, the worker disconnects the grounding device, the test device, and the like used for the operation, and removes each sensor unit 30 attached to the grounding device, the test device, and the like.

When all the sensor units 30 are removed and their magnetic switches are turned off (NO in step 102, YES in step 105), the output of the interlock signal is canceled and the display 23 is turned off ( Step 1
06).

When the output of the interlock signal is released, the relay contact 11b of the control circuit unit 10 is restored (closed).
I do. With this return, the disc 3 can be closed with no voltage, and the power supply line can be turned on.

However, if the magnetic switch is turned on while at least one sensor unit 30 is attached (NO in step 105), the output of the interlock signal and the lighting of the display 23 are continued (step 105). Step 104).

At this time, even if the operator closes the disc 3, the closing operation cannot be performed, and the power supply line downstream of the disc 3 remains disconnected.

The fact that at least one sensor unit 30 is attached is a proof that the grounding equipment, test equipment, and the like used for the work have not been completely removed. In this case, since the power supply line is kept shut off since the disconnection operation of the disc 3 cannot be performed, it is possible to prevent a short circuit accident or the like while the grounding device is still connected, thereby ensuring sufficient safety of the worker. Can be secured.

Since the operator cannot close the disc 3 and the power supply line does not conduct, and since the display 23 is kept lit, all the sensor units 30 have not been removed. That is, it is surely detected that the user has forgotten to remove the grounding device, the test device, and the like. Only after the removal forgetting is resolved, the conduction of the power supply line based on the closing operation of the disc 3 is allowed.

Therefore, it is possible to prevent the worker from forgetting to remove, for example, the grounding device or the test device due to "getting used" or "inadvertently", thereby ensuring high safety and reliability. In addition, since the unit main body 20 is equipped with the battery power supply 28 as an operation power supply, it can be carried and used anywhere, which is convenient.

Incidentally, the sensor unit 30 connected to the unit main body 20 by a connector may come off for some reason such as contact or pull during the work, or a connection failure may occur even if it does not come off completely. In this case (YE in step 103)
S), the time count t by the timer 27 is started (step 107), and when the time count t reaches a certain time ts with disconnection or poor connection (step 108).
YES), a buzzer sound is emitted from the buzzer 26 (step 109).

The buzzer sounds inform the operator that disconnection or poor connection has occurred. The worker can remove the disconnection or the connection failure according to the notification.

In addition, the display 2
3 blinks, and the poor connection is reported not only to the auditory sense but also to the visual sense of the worker. As a result, disconnection and poor connection are reliably eliminated.

On the other hand, the unit body 20 is connected to the control circuit 10
It is also possible to use without connecting. An example of this use is shown in FIG.

For example, in the work of installing the new power supply 52 in place of the existing power supply 51, the existing power supply 51 and the new power supply 52 are connected by two temporary wires 53 and connected to the existing power supply 51. Measuring instrument 5 attached
The connection data is recorded by a plurality of lead wires 55 from 4. The operation of the existing power supply 51 is
After the operation is shifted to the operation 2 and the shift is detected by the measurement of the measuring device 54, the connection of the temporary wiring 53 and the connection of the lead wire 55 are released.

In this case, the temporary wiring 53 and the lead 55
The display unit 23 is installed near the newly installed power supply 52.

If at least one of the sensor units 30 is attached to the object (NO in step 105), the display 23 is kept lit (step 104).

The fact that the display 23 remains lit means that
This is evidence that the removal of all the sensor units 30 has not been completed, that is, the removal of the temporary wiring 53 and the lead wire 55 has not been completed. In this case, the worker senses that he or she has forgotten to remove, and can resolve it.

In the above-described embodiment, the display 23 for displaying the "work in progress" through the transmitted light is used as the alarm.
However, the invention is not limited thereto, and a sound generator, a lamp, or the like may be used.

In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

[0046]

As described above, according to the present invention, as long as at least one sensor unit is attached to a grounding device, a test device, or the like, the alarm device is operated and the output of the interlock signal is continued. Since the power system line is forcibly shut off, it is possible to prevent accidents such as forgetting to remove grounding equipment and test equipment due to "getting used" or "inadvertently", thereby preventing accidents and Can be provided, which is excellent in safety and reliability that can ensure sufficient safety of the user.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration and a use form of an embodiment.

FIG. 2 is a diagram showing a specific configuration of a sensor unit according to one embodiment.

FIG. 3 is a flowchart for explaining the operation of the embodiment;

FIG. 4 is a diagram showing another use form of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... AC power supply 2 ... High voltage receiving board 3 ... Disconnect 10 ... Control circuit part 11 ... Relay 11b ... Relay contact 20 ... Unit main body 21 ... Connector 23 ... Indicator (alarm) 24 ... Lead wire 24a ... Connection terminal 25 ... Control unit 26: Buzzer (alarm means) 27: Timer

Claims (4)

[Claims] 1. A unit body, a sensor unit connected to the unit body, capable of freely attaching and detaching to and from an article, and having a function of detecting the attachment and detachment, and an alarm derived from the unit body. Has a connection terminal incorporated in the power system, disconnects the line of the power system in response to an interlock signal input from the connection terminal, and releases the interlock signal from the interrupted state. A control circuit unit extending from the unit body, a lead wire that can be freely connected to and disconnected from a connection terminal of the control circuit unit, and a control unit provided in the unit body. The control unit includes a detecting unit that detects a mounting / removing state of the sensor unit based on the detection of the sensor unit, and a detecting unit that detects the mounting state by the detecting unit. Control means for operating the annunciator until a detachment state is detected and outputting an interlock signal via the lead wire. 2. A unit body and a mechanism connected to the unit body via a connector which can be freely connected and disconnected, and having a mechanism which can be freely attached to and detached from an article, and a switch which responds to the attachment and detachment thereof. A plurality of sensor units, an alarm derived from the unit main body, and a connection terminal incorporated in the power system and having a connection terminal, and connecting the power system line according to an interlock signal input from the connection terminal. A control circuit unit that shuts off and continues the interrupted state until the input of the interlock signal is released; and a lead wire that is derived from the unit main body and that can be freely connected to and disconnected from a connection terminal of the control circuit unit. A control unit provided in the unit main body, wherein the control unit detects each of the sensors based on a state of a switch of each of the sensor units. Detecting means for detecting the mounting / removing state of the parts, and operating the annunciator until the detecting means detects the mounting state of each of the sensor parts until detecting the removing states of all the sensor parts; and Control means for outputting an interlock signal through the control unit. 3. A unit main body, and a mechanism connected to the unit main body via a connector which can be freely connected and detached, and having a mechanism which can be freely attached to and detached from an article, and a switch which responds to the attachment and detachment thereof. A plurality of sensor units, an alarm derived from the unit main body, and a connection terminal incorporated in the power system and having a connection terminal, and connecting the power system line according to an interlock signal input from the connection terminal. A control circuit unit that shuts off and continues the interrupted state until the input of the interlock signal is released; and a lead wire that is derived from the unit main body and that can be freely connected to and disconnected from a connection terminal of the control circuit unit. A timer and an alarm unit provided in the unit main body; and a control unit provided in the unit main body. Detecting means for detecting the mounting / removing state of each sensor section based on the state of the switch of each sensor section; and detecting the mounting state of each sensor section by the detecting means, and detecting the removing state of all sensor sections. Control means for operating the annunciator until detection and outputting an interlock signal via the lead wire, detection means for detecting connection / disconnection of each sensor unit to / from the unit body, and this detection means A detachment unit comprising: a control unit that operates the timer when the disconnection of the sensor unit once connected is detected; and a control unit that operates the alarm unit when the time of the timer reaches a predetermined time. Forget prevention unit. 4. The sensor unit according to claim 1, wherein the sensor unit has an opening / closing mechanism for attaching the opening / closing mechanism, and the inner periphery of the opening / closing mechanism is covered with a paper-like insulator. The forgetting to remove unit according to claim 3.