JP2007089329A - Transformer for operation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer for operation which can easily be mounted on a panel, of which safety can further be improved in view of burning protection, and in which electric shock prevention can be further improved. <P>SOLUTION: An input and output terminal block and a protection breaker are mounted integrally on a mounting frame that supports the body of the operating transformer provided with primary and secondary coils. An input lead drawn out of the primary coil of the body of the operating transformer is connected to the input terminal of the terminal block. An output lead drawn out of the secondary coil is connected to the output terminal of the terminal block via the protection breaker. The secondary side output of the operating transformer is supplied to loads including a control apparatus via the protection breaker. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In order to supply low voltage power to operation switches and control devices in operation panels, control panels, distribution boards, etc., the present invention incorporates a voltage of 100 to 400 V used in these panels and is about 100 V to 24 V. The present invention relates to an operation transformer that transforms into a low voltage.

  As a power source for a control device that is directly operated by a person on an operation panel, a control panel, or the like, a low-voltage power source of about 100V to 24V is generally used for safety to the person who operates. In order to form such a low-voltage control voltage, an operation transformer as shown in Non-Patent Document 1 is incorporated in various panels.

  As an operation transformer incorporated in a panel, a configuration as shown in FIG. 5 is conventionally known.

  In FIG. 5, reference numeral 1 is an operation transformer, and 3 is a one-pole protective circuit breaker for protecting the operation transformer 1. The circuit breaker 3 is attached to a support rail 8 installed at a location away from the installation location of the operation transformer 1 in the panel. Input lead wires 11a and 11b are drawn from a primary coil provided inside the main body 11 of the operation transformer 1, and output lead wires 11c and 11d are drawn from a secondary coil similarly provided inside the main body 11. The

  A mounting frame 12 that supports the transformer body 11 is provided, and the operation transformer 1 is mounted and fixed in a panel such as a control panel by the mounting frame 12. An input / output terminal block 13 is provided on the mounting frame 12, and the input lead wires 11a and 11b are connected to the input terminals 13a and 13b, respectively.

  In addition, one of the pair of output lead wires 11c is connected to the circuit breaker 3 at a location away from the operation transformer 1 in the panel via the output terminal 13c of the terminal block 13 and the connection wire 5a. Connected to the input side terminal 31. The other output lead wire 11 d is connected to the output terminal 13 d of the terminal block 13. Power is supplied from the output side terminal 32 of the circuit breaker 3 and the output terminal 13d of the terminal block 13 to a load such as a control device in the panel via the connection lines 5c and 5d.

When the current supplied from the operation transformer 1 to the load of the control device via the protective circuit breaker 3 becomes excessive, the overcurrent protection function of the circuit breaker 3 is activated and the circuit breaker 3 trips and loads. Therefore, the operation transformer 1 can be protected from overcurrent.
Fuji Electric Technica News 2004 New Year (Winter) Issue “Transformer for Operation Q & A”, published by Fuji Electric Technica Co., Ltd., January 1, 2004, pages 6-7

As described above, in the conventional device, the operation transformer 1 and the protective circuit breaker 3 are separated and installed at positions separated from each other. Therefore, from the viewpoint of safety such as prevention of burning and electric shock, the following is performed. There is a problem.
(1) In the conventional apparatus, one output line from the output terminal of the operation transformer 1 is connected to the input side terminal of the circuit breaker 3, and the output line from the output side terminal of the circuit breaker 3 is connected to the control device. In such a wiring method, since the mounting position of the circuit breaker 3 is often different for each type of control panel, it is difficult to standardize the thickness and length of the connection line. It is necessary to prepare for each type of panel and the installation work becomes troublesome.
(2) When the connection line connected from the operation transformer 1 to the load device and the connection line from the transformer 1 to the protective circuit breaker is short-circuited for some reason, the circuit breaker is electrically lower. Since the short circuit current does not flow through the protective circuit breaker 3, the protective circuit breaker 3 cannot interrupt the short circuit current, and the short circuit current continues to flow through the operation transformer. There is a risk of developing into a fire accident.
(3) When the secondary circuit of the transformer 1 is maintained and inspected while the voltage is applied to the primary circuit of the operation transformer 1, the secondary circuit of the transformer 1 is opened from the viewpoint of preventing an electric shock accident. However, since the circuit breaker 3 is installed at a position away from the transformer 1, it is easy to check whether the secondary circuit of the transformer 1 is in an open state or a closed state. It cannot be done, and the confirmation work takes a lot of time.

  The present invention provides a transformer for operation that solves such problems in the conventional apparatus, can be easily mounted on a panel, and can be improved in safety from the viewpoint of preventing burning and electric shock. It is an object to do.

  In order to solve such problems, the present invention integrally mounts an input / output terminal block and a protective circuit breaker on a mounting frame that supports a main body of an operating transformer having a primary coil and a secondary coil. The input lead wire drawn from the primary coil of the main body of the operation transformer is connected to the input terminal of the terminal block, and the output lead wire drawn from the secondary coil is connected to the input via the protective circuit breaker. It is connected to the output terminal of the terminal block, and the secondary output of the operation transformer is supplied to a load such as a control device through a protective circuit breaker.

  In the present invention, a temperature fuse can be embedded in the main body of the operation transformer, and an input lead wire can be drawn out from the primary coil through the temperature fuse in series.

  According to the invention thus configured, the protective circuit breaker is integrally attached to the mounting frame of the operation transformer, and the output lead of the secondary coil of the transformer and the circuit breaker are connected via the terminal block. Therefore, since the operation transformer and the protective circuit breaker can be connected with a short connection line, the connection is facilitated and the connection line connecting the operation transformer and the protective circuit breaker is grounded or short-circuited. Is less likely to occur, and electrical safety can be improved. In addition, since the operation transformer and the protective circuit breaker are integrally formed, the closed state or the open circuit state of the secondary circuit of the operation transformer is confirmed by checking the position of the opening / closing handle of the protective circuit breaker. Confirmation can be easily performed, and the control device circuit fed from the operation transformer can be safely inspected.

  Embodiments of the present invention will be described based on the embodiments shown in the drawings.

  1 and 2 show the configuration of an operation transformer according to Embodiment 1 of the present invention.

  In FIG. 1 and FIG. 2, the same elements as those of the conventional apparatus are denoted by the same reference numerals, and description thereof is omitted.

  In the first embodiment, the horizontal width of the mounting plate 12a to which the input / output terminal block 13 of the mounting frame 12 that supports the main body 11 having the primary coil and the secondary coil of the operation transformer 1 is mounted is defined as the mounting frame. It is formed slightly larger than 12 lateral dimensions. Then, the monopolar protective circuit breaker 3 is attached to the projecting portion of the mounting plate 12a so that the operation handle 3h penetrates the window hole provided in the mounting plate 12a and protrudes to the surface side, and screw Fix with 31a.

  The ends of the input lead wires 11a and 11b drawn from the primary coil provided in the main body 11 of the operation transformer 1 are connected to the input terminals 13a and 13b of the terminal block 13, respectively, as in the conventional device. . One lead wire 11c of the pair of output lead wires 11c and 11d drawn from the secondary coil is connected to the output terminal 13c of the terminal block 13, and the other lead wire 11d is provided integrally with the mounting frame 12. It connects with the input side terminal 3a of the circuit breaker 3 attached to the attached mounting plate 12a. The output side terminal 3b of the circuit breaker 3 is connected to the output terminal 13d of the terminal block 13 by the connection line 5d.

  As shown in FIG. 2, by connecting the power supply side connection lines 6a and 6b to the terminals 13a 'and 13b' paired with the terminals 13a and 13b to which the input lead wires of the terminal block 13 are connected, Supply power to the primary side. And it connects to load side connection lines 6c and 6d pulled out from terminal 13c 'and 13d' which became a pair of output terminals 13c and 13d of a terminal block to loads, such as control equipment, of operation transformer 1 The secondary output is supplied to the control device or the like via the protective circuit breaker 3.

  In order to facilitate the connection between the output lead wire 11d of the operation transformer 1 and the protective circuit breaker 3, receptacle terminals 5dt and 11dt are provided at the ends of the output lead wire 11d and the connection wire 5b. A mail tab terminal into which the input / output terminals 3a and 3b can be inserted is formed. In this way, the connection between the output lead wire of the operation transformer and the terminal of the circuit breaker can be performed easily and reliably by fitting the receptacle terminal of the lead wire and the mail tab terminal of the circuit breaker to each other. Connection is easier.

  As described above, since the protective circuit breaker 3 is integrally incorporated in the operation transformer 1, the connection line between the operation transformer and the protective circuit breaker can be shortened and standardized. For this reason, the connection work is facilitated, and a short circuit accident of the connection line is less likely to occur, and the electrical safety is improved.

  In addition, when the operation transformer 1 is mounted on a panel such as a control panel or an operation panel, the operation transformer and the protective circuit breaker are visually inspected regardless of where the operation transformer 1 is mounted. When the control circuit breaker is inspected, for example, when the protective circuit breaker 3 is turned off to open the output side of the operation transformer, the position of the operation handle 3h This makes it easy to visually check the open / closed state of the secondary output circuit of the operation transformer.

  Furthermore, in the present invention, in order to more reliably prevent the occurrence of burning due to overload of the operation transformer, as shown in FIG. 3, when the temperature in the main body 11 of the operation transformer 1 exceeds a predetermined temperature. A thermal fuse or switch 4 that blows or opens contacts to break the electrical circuit is preferably embedded to monitor the temperature of the primary or secondary coil. In this case, one input lead wire 11a of the primary coil is connected to one end of the thermal fuse 4, the lead wire 11a 'is drawn from the other end of the thermal fuse 4, and this lead wire 11a' and the other one of the primary coil are drawn. The input lead wire 11b is connected to the input terminals 13a and 13b of the terminal block 13 of FIG.

  By doing so, since the temperature fuse 4 is connected in series to the input lead wires 11a and 11b drawn from the primary coil of the operation transformer 1, the temperature is excessive due to an internal abnormality of the operation transformer 1. If this happens, the thermal fuse 4 senses this and blows, interrupts the input current from the power supply of the operation transformer, and prevents the operation transformer 1 from burning out. be able to. Therefore, this can further improve the safety of the operation transformer.

  FIG. 4 shows the configuration of the operation transformer according to the second embodiment of the present invention.

  In this second embodiment, a bipolar protective circuit breaker 31 is used in place of the single polar protective circuit breaker 3 in the first embodiment. Other configurations are the same as those in the first embodiment.

  In this case, the output lead wires 11c and 11d drawn from the secondary coil of the main body 11 of the operation transformer 1 are connected to the input side terminals 31a and 31b of the circuit breaker 31, respectively, and the output side terminal 31c of the circuit breaker 31 is connected. , 31d are connected to the output terminals 13c, 13d of the terminal block 13 via connection lines 5c, 5d, respectively. And the output terminals 13c and 13d of the terminal block 13 are connected to loads, such as a control apparatus, by the connection wires 6c and 6d.

  When the bipolar protective circuit breaker 31 is used in this way, both connection lines 6c and 6d that distribute power to the load can be opened and closed, so that the load device can be completely disconnected from the secondary side of the operation transformer. In addition, it is possible to prevent an electric shock accident at the time of inspection of the load device, and it is possible to further increase the electrical safety.

It is a perspective view which shows the structure of the operation transformer by Example 1 of this invention. It is a top view of the state which removed the terminal cover of the terminal block 13 in FIG. It is a perspective view which shows the structure of the main-body part of the operation transformer of Example 1 of this invention. It is a perspective view which shows the structure of the operation transformer by Example 2 of this invention. It is a perspective view which shows the structure of the conventional operation transformer.

Explanation of symbols

1: Operation transformer 11: Strip material for main body lead frame of operation transformer 11a, 11b: Input lead wire drawn from primary coil 11c, 11d: Output lead wire drawn from secondary coil 12: Installation Frame 12a: Mounting plate 13: Input / output terminal block 3, 31: Circuit breaker for protection 4: Thermal fuse

Claims (2)

  An input / output terminal block and a protective circuit breaker are integrally mounted on a mounting frame that supports a main body of an operation transformer having a primary coil and a secondary coil, and the primary coil of the main body of the operation transformer The drawn input lead wire is connected to the input terminal of the terminal block, the output lead wire drawn from the secondary coil is connected to the output terminal of the terminal block via the protective circuit breaker, and the output terminal An operation transformer characterized in that the secondary output of the operation transformer body is supplied to a load such as a control device.   2. The operation transformer according to claim 1, wherein a temperature fuse is embedded in a body of the operation transformer, and the temperature fuse is drawn out in series to an input lead wire from the primary coil. Operation transformer.

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