JP3420669B2 - Alarm device for high-voltage power receiving equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for high-voltage power receiving equipment, in which equipment for converting received high-voltage electricity into working voltage of load equipment for power distribution is housed in a housing having an openable door. .

[0002]

2. Description of the Related Art Conventionally, there is a high-voltage power receiving facility used by a customer to receive power from an electric power company (electric utility company) or the like. As such high-voltage power receiving equipment, there is what is called a so-called cubicle, which is a power receiving equipment that converts high-voltage electricity to a working voltage of load equipment for distribution.
It is configured to be housed in a metal casing having a door that can be opened and closed. The primary side of the high-voltage power receiving equipment is connected to the high-voltage power distribution line (bus bar) of the power company, which is connected to the primary side of the high-voltage power receiving equipment adjacent to the high-voltage power receiving equipment. Also connected in parallel (also called crossover wiring)
Has been done.

When performing maintenance / inspection work on such high-voltage power receiving equipment, in order to ensure safety, it is necessary to stop distribution of high-voltage electricity applied to the primary side of the high-voltage power receiving equipment. Therefore, during maintenance / inspection work, on the primary side of the adjacent high-voltage power receiving equipment, by opening the high-voltage distribution line in the part that is wired to the high-voltage power receiving equipment, The distribution of high voltage electricity has been completely stopped. When the maintenance / inspection work is completed, the high voltage to the primary side of the high voltage power receiving equipment is connected to the primary side of the adjacent high voltage power receiving equipment by connecting the part of the high voltage distribution line that is wired to the primary side. Resume electricity distribution.

[0004]

There is no problem if the high-voltage power distribution equipment of the adjacent high-voltage power receiving equipment is connected after confirming that the maintenance / inspection work of the high-voltage power receiving equipment is completely completed. . However, if the high voltage distribution line of the adjacent high voltage power receiving equipment is connected after the scheduled end time of the maintenance / inspection work, the high voltage Since high voltage electricity is distributed to the primary side of the equipment, an electric shock accident may occur. In particular, in facilities where the operation start time of high-voltage power receiving equipment must be strictly adhered to, when the scheduled end time of maintenance / inspection time elapses, the connection of the high-voltage distribution line on the primary side of the adjacent high-voltage power receiving equipment is almost automatic. Therefore, there is a high risk of the electric shock accident as described above.

Further, conventionally, when the high-voltage power receiving equipment is receiving high-voltage electricity, a predetermined indicator lamp is lit to indicate the power receiving state. However, since the indicator light is provided at a position visible from the outside of the high-voltage power receiving equipment, a person working inside the high-voltage power receiving equipment cannot easily recognize the display, and , It is difficult to prevent the above-mentioned electric shock accident. Since electric shock accidents in high-voltage power receiving equipment often lead to serious electric shock deaths and injuries, there is a strong demand for their prevention. The present invention has been made under such circumstances, and an object thereof is to provide an alarm device for high-voltage power receiving equipment capable of preventing electric shock accidents.

[0006]

According to the invention of claim 1, the door is
An alarm device for high-voltage power receiving equipment that has, which is provided between both output-side terminals of the voltage transformer of the high-voltage power receiving equipment ,
The door closes when the door is opened and opens when the door is closed.
A door opening and closing detection means comprising a Ku limit switch, the high
Between the output side terminals of the voltage transformer of the power receiving equipment,
Control consisting of a relay connected in series with a mitt switch
Means and the power supply for operation are always supplied, and between the start terminals
The normally open contact of the relay is inserted in the circuit of
Activated when the circuit between the activation terminals is closed by the contact
And an alarm means for According to the above configuration, when the door of the high-voltage power receiving equipment is opened while the high-voltage power receiving equipment is receiving high-voltage electricity , or the door is opened.
When the high-voltage power receiving equipment receives high-voltage electricity while in the state,
The limit switch closes, causing the relay to operate and
Normally open contacts close the circuit between the activation terminals of the alarm means.
Therefore, the alarm means is activated.

The invention of claim 2 is the high voltage power receiving device of claim 1.
In the alarm device of the equipment, both output side terminals of the instrument transformer
Is connected in parallel with the limit switch and is operated manually.
Relay between the first test switch, which directly connects both ends of the limit switch, and the activation terminal of the alarm means.
Of the normally open contact and a second test switch connected in parallel with the test means. According to the above configuration, the first test switch is operated
The alarm means is whether or not the alarm operation when an alarm means can check whether normal or not. Also, when the second test switch is operated , both the relay and the alarm means are positive depending on whether the alarm means performs the alarm operation.
You can check whether it is always .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of an alarm device for high-voltage power receiving equipment according to the present invention. The high-voltage power receiving equipment (cubicle) CB is a high-voltage distribution line Lh having a crossover wiring to another adjacent high-voltage power receiving equipment (not shown).
The high-voltage electricity Vh received via the load equipment Z1 to Zn
The equipment for converting to the used voltage Vz and distributing the electricity is housed in the housing. The high-voltage power receiving equipment CB has doors (not shown) provided on the front and left and right side surfaces of the housing. By opening these doors, the equipment inside the housing can be inspected.
It is configured to be maintainable.

The high-voltage power receiving equipment CB is provided with a meter power supply means for generating meter power necessary for operating a meter such as a voltmeter from the high voltage electricity Vh. In this embodiment, an instrument voltage Vm corresponding to the instrument electric power is used.
Instrument transformer T that outputs (for example, about 110 V AC)
The instrument power supply means is configured by the above. In addition,
The instrument power supply means is not limited to the above-mentioned transformer that generates a voltage of 110 V AC, and the instrument power of the form (AC or DC), frequency, voltage and current necessary for the instrument to operate is supplied. It may be generated from high-voltage electricity. For example, the instrument power supply means may be configured by any one of a transformer, a current transformer, an AC power supply device, a DC power supply device, or a combination of two or more.

In this embodiment, the high voltage power receiving equipment CB is used.
Limit switches S1 to S3 constituting the door opening / closing detecting means 1 are provided for each of the doors. Contact of each limit switch is closed when the door is opened, so that the open when the door is closed. The limit switches S1 to S3 are provided between the output terminals of the instrument transformer T.
It is provided in parallel. Also, between the above output terminals
Means that the relays X1 and X2 forming the control means 2 are installed in parallel.
The limit switch group S1 to S3 and the relay group X
1 and X2 are connected in series. And the above limit
The first switch manually operated is
If the test switch TS1 is connected in parallel,
When the switch is operated, both ends of the limit switch will
It is designed to be directly connected.

As shown in FIG. 2, the warning means 3 comprises a warning sound generating section 3a, a warning display section 3b and a power supply section 3c.

The alarm sound generating section 3a is a reading device 31 such as a tape recorder which reads voice information for warning high voltage power reception recorded on a magnetic recording medium such as an audio cassette tape, converts the voice information into a voice signal and outputs the voice signal. , An amplifying device 32 for amplifying an audio signal input from the reading device 31
And a speaker 33 that emits the audio signal amplified by the amplifier as a sound. The number of speakers 33 to be installed and the installation location are not particularly limited, but it is necessary to set such that people inside the high-voltage power receiving facility CB and in the vicinity thereof can reliably hear the voice.

The warning display section 3c is provided with a warning light (patrol light) 34 provided inside the housing of the high-voltage power receiving equipment CB, and a drive circuit 35 for supplying a driving current for operating, that is, lighting or blinking the warning light. It has and. The warning light 34 may be of a display type that lights up or blinks when it is activated, but if it is of a type in which the direction of the emitted light of the warning light 34 changes (for example, rotates), the warning light of the warning light 34 This is preferable because it draws more attention to the display. The number and location of the warning lights 34 to be installed are not particularly limited, but a person who is inside or outside the casing of the high-voltage power receiving equipment CB may be provided with the warning lights 3.
It is necessary to set so that the warning display 4 can be visually recognized.

The power supply unit 3c is provided with the above-mentioned high voltage electricity Vh.
In a system separate from that, a regular power supply (power supply for operation) Vac (for example 100
V commercial AC power source) generates and supplies the power source Vb required to operate the alarm sound generating section 3a and the warning display section 3b. When the activation terminal t-t is closed, the power supply unit 3c supplies the power Vb generated from the regular power supply Vac to the alarm sound generation unit 3a and the warning display unit 3b to activate both operations. .

Therefore, when the closed circuit is formed between the starting terminals t-t, the power Vb is supplied from the power supply unit 3c to the alarm sound generation unit 3a and the warning display unit 3b, whereby the above-mentioned alarm sound generation unit is generated. 3a is a voice warning of high voltage power reception,
For example, an alarm sound indicating "high-voltage power reception has started. Please exit the high-voltage power reception facility because it is dangerous." Is generated. On the other hand, the warning display unit 3b activates the warning lamp 34 to display a warning.

The activation terminals t-t of the alarm means 3 are connected.
The circuit, normally-open contact (make contact) of the relay X1, X2 described above m1, m2 are connected. Also, the circuit coupling between the start terminal t-t of the warning means 3, the second test switches TS2 for closing the circuit by a manual operation is always
It is connected in parallel with the open contacts m1 and m2 .

As shown by the alternate long and short dash line in FIG.
0 is composed of a detection means 1, a control means 2, an alarm means 3, and both test switches TS1 and TS2.

Next, the operation of the alarm device 10 having the above configuration will be described. First, for inspection / maintenance work, when the door of the high-voltage power receiving equipment CB, which was closed while the high-voltage power receiving equipment CB is not receiving high-voltage electricity, is opened, at least one of the limit switches S1 to S3 is Close. However, since the voltage Vm for the measuring instrument is not supplied from the transformer T for the instrument because it is in the non-power receiving state, neither of the relays X1 and X2 operates and the make contacts m1 and m2 of both relays are in the open state . Alarm means 3 for maintaining
, The circuit between its starting terminals t-t is not closed ,
Will not start.

If high-voltage electricity is supplied to the high-voltage power receiving equipment CB while the door of the high-voltage power receiving equipment CB is opened,
The voltage Vm for the measuring instrument is applied from the transformer T for the measuring instrument to the relays X1 and X2 as a detection output through at least one of the limit switches S1 to S3. This makes the relay X
1, X2 actuate to close their make contacts m1, m2
Since the circuit between the activation terminals of the alarm means 3 is closed ,
As described above, the alarm means 3 is activated. That is, the warning sound generating unit 3a outputs a sound to warn of high-voltage power reception by voice, and the warning display unit 3b displays a warning by the warning lamp 34. Here, since the worker receives a double warning by the voice and the warning light, the worker can surely recognize the start of receiving the high voltage electricity. For example, even in an environment where it is difficult to hear the warning sound due to a large amount of noise, it is possible to recognize the warning by the warning light, and even if it is difficult to visually recognize the warning display of the warning light, the warning sound is output. You can listen. Therefore, by promptly evacuating from the inside of the high voltage power receiving equipment CB in response to the warning of the high voltage power receiving, an electric shock accident can be prevented in advance.

Next, even though the high-voltage power receiving equipment CB is receiving high-voltage electricity, the operator mistakenly recognizes that the high-voltage power receiving is stopped and opens the door of the closed high-voltage power receiving equipment CB. The case will be described. In this case, since the instrument power Vm from voltage transformer T has already been output, simultaneously with the opening of the door, when one of the limit sensor S1~S3 Ru closed, relay X1, X2 actuation Therefore, the alarm means 3 starts the alarm operation as in the above procedure. Therefore, since the worker receives a double warning by the voice and the warning light, the worker can surely recognize that the high-voltage power receiving equipment CB is in the state of receiving the high-voltage electricity, so that the inside of the high-voltage power receiving equipment CB is confirmed. There is no accidental entry, and therefore an electric shock accident can be prevented.

Next, the test switches TS1 and TS2 are operated.
The operation in the case of doing will be described. In a state in which by receiving high voltage electrical, when the first test switch TS1 is Ru closed by a manual operation, both ends of the limit switch S1~S3
Since they are directly connected , the relays X1 and X2 are activated and the alarm means 3 is activated. Therefore, the first test switch T
If start alarm unit 3 by the operation of S1, the relay X
It is possible to determine that both 1, X2 and the alarm means 3 are normal. If no first alarm means 3 operation be made of the test switch TS1 is started, the relay X
It can be determined that one or both of the X1, X2 and the alarm means 3 are out of order. The first test switch TS1 needs to be provided so that it can be operated when all the doors of the high-voltage power receiving equipment CB are in the closed state.

On the other hand, the second test switch TS2 is the closed et be manually operated, regardless of the presence or absence of the high voltage electrical power reception, alarm means 3 is activated. Therefore, it is possible to be started alarm unit 3 by the operation of the second test switches TS2, warning means 3 is determined to be normal.
If the alarm means 3 is not activated even if the second test switch TS2 is operated, it can be determined that the alarm means 3 is out of order. Also, the closing operation of the first test switch TS1
When the alarm means 3 is not activated during the operation, the second test switch T
If the warning means 3 is activated during closing operation of the S2, the warning means 3 is a normal, constituting a control means 2 relay X1,
It can be determined that X2 has failed.

[0023] the first test switches TS1 and the second test switch TS2 described above, the test unit 4 to start forcing the warning <br/> report means in accordance with the manual operation is configured.

Further, in the above embodiment, by providing the two relays X1, X2, even if one of the relay fails relay other hand is due to be actuated alarm operation is started reliably Therefore, the reliability of the alarm operation can be secured. Therefore, if the possibility of relay failure can be ignored, one relay may be used,
Two or more relays may be provided if it is necessary to sufficiently consider the possibility of relay failure.

Although the alarm means 3 is designed to give a double warning by voice and a warning light, the alarm sound generating section 3a generates a warning sound by using a bell, a buzzer, a siren or an electronic sound source. May be. However, in this case, it is necessary to adopt an alarm sound that can be clearly distinguished from other alarm sounds generated in the high-voltage power receiving equipment CB and the facility that houses the high-voltage power receiving equipment CB.

Further, the reading device 31 of the alarm sound generating section 3a.
Is not particularly limited as long as it can read the audio information recorded on the recording medium. For example, the recording medium may be a magnetic recording tape such as an audio cassette tape, a semiconductor memory, an optical disk, a magneto-optical disk,
It may be a magnetic disk or the like, and the reading device may be a device corresponding to each recording medium.

Even if the test switches TS1 and TS2 are not provided,
Although there is no hindrance to the operation of the alarm device 10, it is desirable to provide the test switches TS1 and TS2 in order to maintain the reliability of the alarm device 10.

Correspondence between the description of the embodiments and the claims will be described. Limit switches S1 to S3
Is a "door open / close detection unit" that detects the open / closed state of the door only during the period in which the instrument electric power generated from the high voltage electricity is supplied by the instrument electric power supply unit provided in the high voltage power receiving equipment. There is. Therefore, the door opening / closing detection means may be one that can reliably detect the opening / closing of the door only while the meter power is being supplied. For example, a contact-type sensor or a non-contact type sensor may be used. You may use it as an opening / closing detection means.

The alarm means 3 is constantly supplied with operating power, and constitutes "alarm means" for performing a predetermined alarm operation when activated.

The relays X1 and X2 correspond to "control means" which activates the alarm means in response to the detection output when the door open / close detection means detects the open state of the door.

As described above, according to this embodiment, when the housing door of the high-voltage power receiving equipment is opened,
If the high-voltage power reception is started, or if the high-voltage power equipment's housing door is accidentally opened while the high-voltage power is already being received, the alarm means will perform an alarm operation. Workers working inside and outside the
Since it is possible to reliably recognize the reception of high-voltage electricity, it is possible to prevent an electric shock accident by immediately taking a safety action such as withdrawing from the housing.

[0032]

As described above , according to the present invention, when the door of the housing of the high voltage power receiving equipment is opened, the high voltage electricity is started to be received or the high voltage electricity is already received. If the door of the housing of the high-voltage power receiving equipment is accidentally opened at this time, the alarm means will perform an alarm operation, so workers working inside and outside the housing of the high-voltage power receiving equipment will not receive high-voltage electricity. Since it can be surely recognized, an electric shock accident can be prevented by immediately taking safety action such as withdrawing from the case.

The high-voltage power receiving equipment according to the first aspect of the invention is
The alarm device is the output side end of the voltage transformer of the high voltage power receiving equipment.
Provided between the child and closed when the door is opened, the door is closed
The door opening / closing detection means consisting of a limit switch that opens when closed and the output side terminals of the instrument transformer are connected to each other.
A control consisting of a relay connected in series with a limit switch.
Control means and high-voltage electricity supplied to high-voltage power receiving equipment are separate systems
The power supply for operation is always supplied by the
The normally open contact of the relay is inserted in the
Starts when the circuit between the start terminals is closed by
Since it has an alarm means , if the door is opened while the high-voltage power receiving equipment is receiving high-voltage electricity, the limit switch closes and the relay is operated by the output voltage of the instrument transformer, and its normally open state. The alarm means is activated because the contact closes the circuit between the activation terminals of the alarm means. Therefore, an operator working inside or outside the housing of the high-voltage power receiving equipment can surely recognize the start of receiving the high-voltage electricity and evacuate from the housing, so that an electric shock accident can be prevented. In addition, limit the door open / close detection means and control means as described above.
In the case of a switch and a relay , by connecting a plurality of switches in parallel, the reliability of the alarm operation can be easily improved.

According to the second aspect of the invention, the instrument transformer
Connect the limit switch in parallel between the output terminals of the pressure device.
Of the limit switch by manual operation.
Since the first test switch having both ends directly connected and the second test switch connected in parallel with the normally open contact of the relay between the activation terminals of the alarm means are provided, the test means is provided. , depending on whether the alarm means when operating the first test switch performs alarm operation, the warning means is positive
It is possible to confirm whether or not the relay is normal and whether or not both the relay and the alarm means are normal depending on whether or not the alarm means performs the alarm operation when the second test switch is operated. You can

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an alarm device for high-voltage power receiving equipment of the present invention.

FIG. 2 is a configuration diagram of alarm means in the embodiment.

[Explanation of symbols]

CB High-voltage power receiving equipment (cubicle) T Meter transformer (power supply for meters) Vh high voltage electricity Vm Meter voltage (meter power) Vac Regular power supply (power supply for operation) 10 Alarm device 1 detection means S1, S2, S3 limit switch 2 control means X1, X2 relay 3 warning means 3a Alarm sound generator 3b Warning display section 3c power supply unit 4 Test means TS1 first test switch TS2 second test switch

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Claims (2)

(57) [Claims] 1. An alarm device for high-voltage power receiving equipment having a door , which is provided between both output-side terminals of an instrument transformer of the high-voltage power receiving equipment.
Is provided and is closed when the door is opened and the door is closed.
Between the door open / close detection means consisting of a limit switch that opens when the power is turned off and both output side terminals of the voltage transformer of the high voltage power receiving equipment.
It consists of a relay connected in series with the limit switch.
The control means and the high-voltage electricity supplied to the high-voltage power receiving equipment operate on separate systems.
The operating power is always supplied to the circuit between the start terminals.
When the normally open contact of the relay is inserted,
Alarm hand that is activated when the circuit between the activation terminals is closed
An alarm device for high-voltage power receiving equipment , which has a step . 2. An alarm device for high-voltage power receiving equipment according to claim 1.
At the limit between both output side terminals of the instrument transformer
It is connected in parallel with the switch, and the
A first test switch that directly connects both ends of the limit switch and a normally open contact of the relay between the activation terminals of the alarm means.
A high-voltage power receiving device comprising a test means including both or one of a second test switch connected in parallel.
Biwa alarm device.