JP4979062B2 - Signal transmission circuit device - Google Patents

Description

  The present invention relates to a signal transmission circuit device that exchanges signals with a counterpart device such as a CT or a clamp meter by electromagnetic induction.

  When measuring the current of the circuit under test using a current transformer (hereinafter referred to as CT) or a clamp meter, the output of the current generator together with the wire of the circuit under test in the through hole of the measurement part of these devices There is a method of passing only an unnecessary current in the circuit to be measured and passing a current in a phase opposite to that of the circuit to be measured, thereby canceling the unnecessary current and measuring only the current to be originally measured in the circuit to be measured. For example, this measurement method is used when measuring only the resistance component excluding the capacitance component in leakage current measurement using a CT or a clamp meter.

  However, in this measurement method, if the current to be canceled is large, the output from the current generator also increases and power consumption increases. Therefore, as a countermeasure, the output can be output by winding the output line from the current generator multiple times. The current is apparently amplified. However, for this purpose, a complicated operation is required in which the output line of the current generator is temporarily removed from the CT, clamp meter, or the like and wound around the clamp portion of the clamp meter a plurality of times.

  Further, in many cases, a motor relay is installed in an electric motor circuit for obtaining rotational power by rotating a rotating shaft of a motor for the purpose of motor overload protection. This motor relay is used in combination with a current converter composed of CT, detects an abnormal state such as an overload by the current converter output, and outputs a control signal to an external device such as an electromagnetic switch of the electric motor circuit, for example. It is provided. For this motor relay, it is necessary to periodically conduct a test to check whether the motor relay operates normally by supplying a simulated motor overload current from a test device such as a current generator to the current converter.

  In this operation test, when the power line to the motor is wound around the current converter multiple times, it is necessary to perform the test by winding the current output line of the test device around the current converter so that the number of turns is the same. There is a problem that it takes time and labor to wind the current output line around the current converter. In addition, depending on the mounting position of the current converter, the operation of winding the current output line is often difficult.

In the present specification, hereinafter, in addition to the above-described devices having an annular core such as a CT, a clamp meter, and a current converter, the annular core itself is referred to as “mating device”.
JP 2003-255011 A Japanese Patent No. 3405407 Japanese Patent Laid-Open No. 9-80095 Japanese Patent Publication No.8-14593 Utility Model Registration No. 3112098 Specification

  In view of the above circumstances, the present invention eliminates the troublesome work of winding a signal wire in a coil shape around an annular core or the like of a counterpart device, and as a result, a signal that can shorten work time and improve work efficiency. It is an object to provide a transmission circuit device.

  As a result of intensive studies on the object, the present inventors have prepared a circuit device including a coiled conductor path formed by arranging a plurality of insulated conductors in parallel in a bundle, and one of the coiled conductor paths. It is found that the above-mentioned problems can be solved by inserting a plurality of bundled insulated conductors forming a part into an annular core of a counterpart device and energizing the plurality of insulated conductors, thereby completing the present invention. It came to.

That is, according to the present invention, the object is achieved by a group unit, and the base on the insulated conductor bundles is supported thereby, alternately with each insulated conductor which forms the base on the insulated conductor bundle as a whole becomes a series A base outer insulated conductor bundle having a plurality of insulated conductors forming a coiled conductor path, and a number of turns connected to the base upper insulated conductor bundle or the base outer insulated conductor bundle and for switching the number of energizable turns of the coiled conductor path Switching means, and forming the coiled conductor path after inserting the outer insulated conductor bundle into the annular iron core of the counterpart apparatus having an annular iron core, thereby causing the counterpart apparatus to perform electromagnetic induction. It is achieved by a signal transmission circuit device characterized in that a signal is exchanged between and .

  According to the signal transmission circuit device of the present invention, the base outer insulated conductor bundle that is a part of the coiled conductor path is inserted into the annular core of the counterpart device such as CT, so that one piece of the annular core of the counterpart device is provided. Since the same effect as that obtained when the insulated conductor is wound around the annular core can be obtained multiple times, the troublesome work of winding the insulated conductor can be eliminated, and as a result, the working time can be shortened and the working efficiency can be improved. it can. Further, an apparently amplified current is given to the counterpart device, and in some cases, an induced current smaller than that of the counterpart device can be received.

  Hereinafter, the signal transmission circuit device of the present invention will be described in more detail with reference to the accompanying drawings, but the present invention is not limited to the following embodiments. In the following drawings, the same or common parts are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a circuit diagram schematically showing an outline of one reference example of a signal transmission circuit device, and FIGS. 2 and 3 are diagrams showing two embodiments of the signal transmission circuit device of the present invention having a winding number switching means. It is a circuit diagram which shows an outline typically, respectively . As shown in FIGS. 2 and 3, the signal transmission circuit device 1 of the present invention includes a coiled conductor path 10, a base 5 that supports a part of the coiled conductor path 10, and a winding number switching means 4. . The reference example shown in FIG. 1 relates to a circuit device that does not include the number-of-turns switching means, but other configurations are essentially the same as those of the embodiment shown in FIGS.

  The coiled conductor path 10 is drawn to the outside of the base 5 and returns to the base 5 again (hereinafter referred to as “outside base insulated conductor bundle”) 2 and a portion supported on the base 5 (hereinafter referred to as “ "Insulated conductor bundle on the base"). Although the number of turns of the coiled conductor path 10 can be set as appropriate, it is 8 in FIG.

  The base 5 is an insulating material itself and is not particularly limited in its material, shape and size as long as it can support and fix the insulating conductor bundle 3 on the base, but for example, a printed wiring board (substrate) or the like. It can be used suitably. The base 5 can be provided with connection ends 6 and 7 for transmitting and receiving a signal flowing through the coiled conductor path 10 to other circuits and the like. The connection ends 6 and 7 may be known connection terminals. In the following drawings, the same reference numerals 6 and 7 are used for the connection end or the connection terminal.

  The base outer insulated conductor bundle 2 of the present invention is a bundle of a plurality of insulated conductors arranged in parallel. In order to bundle a plurality of insulated conductors, a binding tool or the like may or may not be used. Each insulated conductor is obtained by electrically insulatingly coating a core material made of a conductive material such as copper, iron or aluminum with rubber, synthetic resin, paper, cotton or silk thread, enamel, an inorganic insulator, or the like. The core material may be a single wire conductor or may be a twist of a plurality of the wire conductors. The strand conductor is a rod-like body or a linear body having a cross-sectional shape such as a circle, square, rectangle, or ellipse.

  Specific examples of the insulated conductor include insulated wires used for appliances, indoor wiring, communication, and the like. In particular, various insulated wires for audio signals, video signals, or data transmission used for communication devices and IT devices can be suitably used. This insulated wire may be single-core or multi-core. Moreover, this insulated wire may be shielded inside. When this insulated wire is multi-core, the cross-sectional shape is not limited to a circle. Therefore, it is possible not only to use a normal multi-core insulated wire having a circular cross section, but also to use a flat flat cable or the like. Specific examples of such insulated wires include LAN cables, SCSI cables, eSATA cables for connecting the computer and peripheral devices such as multi-core cables and flat cables for connecting various devices housed in a personal computer. For example, a general-purpose cable used between acoustic devices or between communication devices.

  When the insulated wire is a single core, it can be used in the circuit device of the present invention by collecting a plurality of insulated wires into a bundle. In order to bundle the insulated wires, a known binding tool or wire protector may or may not be used. In addition, when the insulated wire is multi-core, it is possible to bundle a plurality of multi-core insulated wires as in the case of the single-core wire, but the multi-core insulation includes the necessary number of core materials. Only one electric wire can be used. In the present invention, a multi-core or single-core insulated wire can be used as described above, but preferably a multi-core insulated wire, more preferably a multi-core insulated wire including the necessary number of core materials is used. .

  The length of the base outer insulated conductor bundle 2 can be arbitrarily set within a common sense range in consideration of the positional relationship with the counterpart device. Further, as described above, individual insulated conductors can be detachably connected in the middle of the base outer insulated conductor bundle 2.

  Further, the base-side insulated conductor bundle 3 of the present invention is configured as a plurality of insulated conductors arranged in parallel, like the base-side insulated conductor bundle 2. As this insulated conductor, an insulated wire of the same kind or different kind from the insulated wire used for the base outer insulated conductor bundle 2 can be used. In this case, a binding tool or the like may or may not be used to bundle the plurality. Further, when the base 5 is a printed wiring board, the base-side insulated conductor bundle 3 can be one in which circuit wiring is printed on the printed wiring board, and an insulated wire can be used as an end of the circuit wiring on the printed wiring board. Can be used in combination. On the printed wiring board, when it is necessary to cross one wiring in a state where other wiring is insulated, a jumper wire made of an insulated conductor is appropriately used on the printed wiring board, or a known multilayer Substrate technology can be used.

The base outer insulated conductor bundle 2 and the base upper insulated conductor bundle 3 may be integrated, or may be separate and connectable to each other. Specific examples of these include the following three.
(1) One insulated conductor is wound a plurality of times to form a coiled conductor path 10, and a portion of the coiled conductor path 10 that is supported and fixed on the base 5 is defined as the base upper insulated conductor bundle 3. This portion is referred to as a base outer insulated conductor bundle 2.
(2) A plurality of insulated conductors are arranged in parallel to form a bundle, and both ends of the bundle of insulated conductors are connected in a continuous manner to form a coiled conductor path 10, and the coiled conductor path The portion supported and fixed on the base 5 of the base 10 is the base upper insulated conductor bundle 3, and the other portion is the base outer insulated conductor bundle 2. In this case, the connecting end portion is preferably provided at the peripheral portion on the base portion 5, and more preferably detachable so as to eliminate the connecting work.
(3) Prepare two bundles of insulated conductors arranged in parallel, and support and fix one on the base 5 to form an insulated conductor bundle 3 on the base, and the other to the outside insulated conductor bundle 2 on the base. Then, the two insulated conductors are alternately connected in a continuous manner. In this case, it is preferable that the two insulated conductor bundles are detachably connected.
Among these, in the present invention, the above aspects (2) and (3) are preferred.

  When the base outer insulated conductor bundle 2 and the base upper insulated conductor bundle 3 are separate bodies, as shown in FIG. 1, the other end of the base upper insulated conductor 3a provided with the connection terminal 6 at one end is insulated from the base. The other end that is connected to one end of the conductor 2a and returns to the base 5 via the measurement unit of the counterpart device is connected to the base-side insulated conductor 3b. Thus, the base outer insulated conductor and the base upper insulated conductor are alternately integrated in the order of 3b → 2b → 3c → 2c → 3d → 2d → 3e → 2e → 3f → 2f → 3g → 2g → 3h → 2h → 3i. It is connected to become.

  There is no particular limitation on the connection method between the base upper insulated conductors 3a to 3i and the base outer insulated conductors 2a to 2h. For example, the connection can be made for each insulated conductor by a normal wire connection method such as soldering or terminal tightening. In addition, as shown by reference numerals 25 and 26 in FIG. 3, a pair of male and female connection connectors can be fixed in advance to the base outer insulating conductor bundle 2 and the base upper insulating conductor bundle 3, respectively, and connected via these. Of these connection methods, in the present invention, the latter connection connector is preferably used.

  When a pair of male and female connection connectors are used, the connection connectors are fixed to both ends of the base upper insulated conductor bundle and the base outer insulated conductor bundle so that the corresponding insulated conductors can be connected to each other by a contact. As such a connection connector, it is possible to use various connectors for communication, voice transmission, data transmission, and power connectors used for communication devices and IT devices. Specifically, the insulated wires shown as examples (multi-core cables and flat cables for connecting various devices housed in a personal computer, such as LAN cables, SCSI cables, eSATA cables for connecting the computer and its peripheral devices, For example, connection connectors fixed at both ends of a general-purpose cable used for connection between audio devices or between communication devices). These connection connectors can be appropriately selected and used depending on the number and arrangement of the insulated conductors in the base outer insulated conductor bundle 2 and the base upper insulated conductor bundle 3, the cross-sectional shape of both insulated conductor bundles, and the like. In FIG. 3, reference numerals 25 a and 26 a indicate male and female connection connectors supported and fixed on the base 5, and 25 b and 26 b indicate the other connection connectors fixed to both ends of the outer base conductor bundle 2. (The same applies to FIGS. 4 and 5 below). As to whether to use male or female connectors 25a, 26a and 25b, 26b, the power supply side (or induction current generation side) should be female, and the other should be Can be male.

  By configuring the signal transmission circuit device of the present invention as described above, the current signal is apparently amplified in the counterpart device, as in the case of winding one insulated conductor around the annular core of the counterpart device. In the counterpart device, an induced current corresponding to the current signal or the amplified current signal is induced by electromagnetic induction. In addition, by preparing multiple signal transmission circuit devices of the present invention having coiled conductor paths with different numbers of turns, it is necessary to change the number of times the counterpart device penetrates the annular core. In place of the signal transmission circuit device that has been used, another signal transmission circuit device having a different number of turns of the coiled conductor path can be used, which eliminates the need for winding the insulated conductor around the annular core of the counterpart device. It becomes possible.

In the present invention, further eliminating the interchange work of the signal transmission circuit device shown in FIG. 1, in order to increase the convenience of working, Ru provided turns switching means into a coil conductor. The turn number switching means is a switch capable of switching the number of turns that can be energized in the coiled conductor path.

  Various types of switches as the winding number switching means can be used in consideration of the number of winding switching points. For example, a single-circuit multi-contact (two or more contacts) type switch can be used alone or in combination of two or more types, and this type of switch can be used in various ways such as one circuit, one contact, two circuits, one contact, two circuits, multiple contacts. Combinations of types of switches can also be used.

  As such a switch, a mechanical switch that mechanically opens and closes a contact by an external force from an operation unit included in the switch, an electronic switch incorporating a semiconductor having a switch characteristic, or the like can be preferably used. Specific examples of the mechanical switch include a toggle switch, a slide switch, a push switch, a rocker switch, a rotary switch, a dip switch, and a jumper switch. Any of these mechanical switches can be used in the signal transmission circuit device of the present invention. However, in consideration of ease of use and operability, it is preferable to use a toggle switch or a rotary switch. A known switch can be used as the electronic switch. In this case, a trigger signal such as a bias voltage causing a switching operation is supplied from the signal transmission circuit device of the present invention or a predetermined signal generation circuit provided outside. be able to.

As the winding number switching means 4, as shown in FIGS. 2 and 3, a one-circuit, three-contact type switch is used, and the switch is arranged and fixed on the base portion 5 in the vicinity of the base-side insulated conductor bundle 3. . The insulated conductor 33 from the connection end 7 is connected to the common contact of this switch, the insulated conductor 3i constituting the base-side insulated conductor bundle 3 is connected to the remaining contacts, and the lead wire 31 drawn from the base-insulated conductor bundle 3; 32 are connected to each other. In FIG. 3, the reference numerals of the individual insulated conductors constituting the coiled conductor path 10 are omitted except for the reference numeral 3i.

  The lead wires 31 and 32 can be drawn from appropriate positions at both ends or in the middle of the base-side insulated conductors 3b and 3e. The connection of the lead wire to the base upper insulated conductor can be performed by a known method. In FIG. 2, only these two lead lines 31 and 32 are shown, but the number of lead lines is not limited to this, and one or three or more lines are taken into consideration in consideration of the use of the signal transmission circuit device of the present invention. It can also be. In this case, the lead wires may be drawn from different base-side insulated conductors. For the lead wires 31 and 32, it is preferable to use an insulated conductor, particularly an insulated wire.

  By operating this switch, a signal input / output to / from the signal transmission circuit device 1 of the present invention via the connection terminals 6 and 7 is a conductor path of 3a → 2a → 3b → 31, a coiled conductor having four turns. From the path (3a → 2a →... → 2d → 3e → 32) or the coiled conductor path (3a → 2a →... → 2h → 3i) having 8 turns to the connection terminal 7 through the turn number switching means 4. It will flow through the circuit.

  The arrangement fixing position of the winding number switching means and the connection position with the coiled conductor path 10 are not limited to the examples shown in FIGS. For example, it can be installed in either of these two insulated conductor bundles in the vicinity of the connecting connector that connects the base outer insulated conductor bundle 2 and the base upper insulated conductor bundle 3. In this case, the winding number switching means can be provided at any position of each insulated conductor bundle as long as it does not hinder the insertion into the counterpart device. As such a number-of-turns switching means, a type in which a part or all of a plurality of insulated conductors constituting the base outer insulated conductor bundle 2 or the base upper insulated conductor bundle 3 is short-circuited by operating this is used. it can. Further, the turn number switching means can be arranged outside the signal transmission circuit device of the present invention. In this case, the end of the coiled conductor path and a predetermined number of lead wires are drawn out from the coiled conductor path and connected to the winding number switching means.

  As described above, by further providing the winding number switching means in the signal transmission circuit device of the present invention, it becomes easy to operate the winding number switching means when it is necessary to change the number of times the counterpart device penetrates the annular core. The number of penetrations can be changed, improving the convenience of work.

  In addition to the above configuration, the signal transmission circuit device of the present invention can incorporate an insulating circuit using a photocoupler or the like, a data transmission (transmission / reception) circuit, and the like as necessary. These circuits can be arranged on the base 5, for example.

  Next, a usage example of the signal transmission circuit device of the present invention will be described. The signal transmission circuit device of the present invention is an output device such as a current generator (including a standard current generator; the same applies hereinafter), or a transmission device for an induced current generated in an annular core (for example, secondary winding of CT). Line etc.). In the following, an example in which the former signal transmission circuit device of the present invention is mounted on a current generator will be described, and then a usage example of such a current generator will be described.

  FIG. 4 is a diagram showing an example of a current generator equipped with the signal transmission circuit device of the present invention using a LAN cable as a base outer insulated conductor bundle. In this figure, the current generator 11 has a built-in base 5 having a base-side insulated conductor bundle 3 and a winding number switching means 4. Two connecting connectors 25a and 26a of a pair of male and female are fixed to the base 5 at a predetermined distance. The connection connectors 25a and 26a of either of these males and females are exposed outside through a through hole (not shown) provided in the outer box of the current generator 11, and are connected to both ends of the LAN cable 21, respectively. The other connection connectors 25b and 26b of the pair of male and female are connected. Thus, the base upper insulated conductor bundle 3 and the LAN cable 21 are connected via the connection connectors 25 and 26 to form a coiled conductor path. The winding number switching means 4 can be used by appropriately selecting the above-described examples. As the LAN cable 21, for example, a 4-pair 8-core type can be used.

  FIG. 5 shows another example of the current generator 11 to which the signal transmission circuit device 1 of the present invention can be attached. The signal transmission circuit device 1 in this figure is configured as a single device itself, and the base 5 is not built in the current generator 11. Two lead wires drawn out from the base-side insulated conductor bundle 3 and the number-of-turns switching means 4 are connected to connection plugs 6 and 7 extending in parallel from the base portion 5 in the same direction. The connection plugs 6 and 7 can be inserted and fitted into a predetermined socket type output terminal of the current generator 11. The other configuration is not substantially different from the embodiment shown in FIG. In addition, the said base 5 can be accommodated in the container which can accommodate this prepared separately. In this case, the connection connectors 25a and 26a of the LAN cable 21, the connection plugs 6 and 7, and the operation unit of the winding number switching unit 4 are exposed or protruded to the outside.

  In the example of the current generator shown in FIG. 4 and FIG. 5, the LAN cable 21 as the outer base insulated conductor bundle 2 of the signal transmission circuit device of the present invention attached thereto is inserted into the through hole of the annular core of the counterpart device. By operating the winding number switching means 4, it is possible not only to send a constant current signal output from the current generator 11 to the counterpart device, but also to amplify the current signal apparently. It becomes. In the counterpart device, an induced current corresponding to the current signal or the amplified current signal is induced by electromagnetic induction.

[Usage example 1]
The signal transmission circuit device of the present invention can be used when measuring the current of only the resistance component in the leakage current measurement of an AC circuit using the CT or the clamp meter described in the background art. The signal transmission circuit device of the present invention is mounted on the current generator as shown in FIG. 4 or FIG. 5, and the base outer insulated conductor bundle of the signal transmission circuit device of the present invention is CT together with the electric wires of the circuit to be measured. By passing a current in the opposite phase to the capacitive current in the measured circuit through the base outer insulated conductor bundle, the capacitive current is canceled out and the current of only the resistance component of the measured circuit is passed. Can be measured.

  When the capacitive current to be canceled is large, the current output from the current generator increases and the power consumption increases. By attaching the signal transmission circuit device of the present invention to the device, the current generator as in the prior art is installed. The number of penetrations can be increased / decreased without performing the operation of turning the output line into the CT through hole, and as a result, the output current can be amplified apparently.

[Usage example 2]
The signal transmission circuit device of the present invention can be used as an output device of a current generator used for a motor relay operation confirmation test. The signal transmission circuit device of the present invention can be mounted on the current generator as shown in FIG. 4 or FIG. 5 similarly to the first usage example, but the former current generating device is used in this usage example. . FIG. 6 is a device connection diagram for an operation test of this motor relay, and FIG. 7 is a diagram showing each phase distribution line to the through holes 30a, 30b, 30c of each phase of the current converter shown in FIG. It is the elements on larger scale which show the insertion state of the multi-core insulated wire which is a part of transmission circuit apparatus. In the usage example shown in FIGS. 6 and 7, the current generator 12 is capable of multi-channel output, and three sets of signal transmission circuit devices of the present invention are attached to the output circuit.

  As shown in FIG. 6, three-phase three-wire AC distribution lines U, V, and W are connected to a motor 45 through an electromagnetic switch 40 to constitute a motor circuit. The overload protection circuit of the motor 45 includes a current converter 30 installed between the electromagnetic switch 40 and the motor 45, a motor relay 41, an output line 34 of the current converter 30 connecting them, and a motor. It consists of a control signal line 42 connecting the relay 41 and the coil of the electromagnetic switch 40. In this protection circuit, when the current output of the current converter 30 becomes a predetermined overload condition, the motor relay 41 operates the coil of the electromagnetic switch 40 via the control signal line 42 and contacts in the electromagnetic switch 40. The motor is prevented from being overloaded by opening the and stopping the motor.

  In the operation confirmation test of the motor relay 41, each of the multicore insulated wires of the signal transmission circuit device of the present invention is inserted into each of the three through holes of the current converter 30 as shown in FIG. Insert this. This multi-core insulated wire can be appropriately selected from those exemplified above in consideration of the allowable current in the overload condition of the motor. Thus, each phase distribution line of U, V, W is wound around the current converter 30 four times (4 times of penetration), whereas the multi-core insulated wire is wound four times like each phase distribution line. There is no need to turn.

  Next, a current that satisfies the overload condition of the motor relay 41 is passed from the current generator 12 to the current converter 30 to check whether the motor relay 41 opens or closes the contact of the electromagnetic switch 40. When the contact of the electromagnetic switch 40 is opened, the operation of the motor relay 41 is normal, and when the contact is not opened, it can be determined that the operation of the motor relay 41 is abnormal. At that time, by operating the winding number switching means 4 of the signal transmission circuit device of the present invention, the current is apparently amplified in the current converter 30, so that the current output from the current generator 12 can be suppressed, and the current generation The power consumption of the device 12 can be kept low.

[Usage example 3]
As shown in FIG. 8, the signal transmission circuit device of the present invention is attached to a standard current generator for calibration used for calibration such as a clamp meter and used as a device for outputting a standard current from the device. Can do. In this figure, reference numeral 13 is a standard current generator, 50 is a clamp meter, 51 is a clamp part of the clamp meter, and 53 is a display. Here, the calibration means that a clamp meter or the like periodically determines whether or not the difference between the standard current and the current measurement value is within an allowable range at a predetermined time interval. In FIG. 8, the base-side insulated conductor bundle incorporated in the standard current generator 13 is omitted.

  In the calibration work, the LAN cable 21 is inserted as a standard current output line from the signal transmission circuit device 5 of the present invention into the clamp portion 51 of the clamp meter 50. The standard current from the standard current generator 13 is passed through the LAN cable 21, the current flowing through the LAN cable is measured by the clamp meter 50, and the result is displayed on the display 53, so that the true current value can be obtained. It is possible to evaluate the difference from the current display value of the clamp meter 50.

  Also in this use example, by changing the number of turns of the coiled conductor path by the number-of-turns switching means 3 of the signal transmission circuit device 5 of the present invention, the number of penetrations of the clamp portion 51 of the clamp meter 50 can be reduced without performing the winding operation. As a result, calibration for a standard current different from the standard current is possible. In the number-of-turns switching means 4, the number of turns of the coiled conductor path including the LAN cable as the output line can be changed in multiple stages, thereby making it possible to calibrate a plurality of standard currents.

  As described in the above use examples, the signal transmission circuit device of the present invention is used as an output device of a current generator or a standard current generator for calibration, so that the work of winding a signal wire around the through hole of the current converter can be performed. Since the current converter apparently amplifies the current converter by increasing the number of turns that can be energized in the coiled conductor path by the turn number switching means, the power consumption of the current generator can be kept low.

It is a circuit diagram showing typically a reference example of a signal transmission circuit device . It is a circuit diagram which shows typically the outline of one Embodiment of the signal transmission circuit apparatus of this invention provided with the winding number switching means. It is a circuit diagram which shows typically the outline of another embodiment of the signal transmission circuit apparatus of this invention provided with the winding number switching means. It is a front view which shows an example of the electric current generator which incorporated the signal transmission circuit apparatus of this invention. It is a front view which shows an example of the electric current generator which can attach the signal transmission circuit apparatus of this invention externally. It is an apparatus connection diagram for performing an operation confirmation test of a motor relay using a current generator incorporating the signal transmission circuit device of the present invention. FIG. 6 is a partially enlarged perspective view showing a penetration state of each phase distribution line to the through hole of the current converter shown in FIG. 5 and a LAN cable that is a part of the signal transmission circuit device of the present invention. It is an apparatus connection diagram for calibrating a clamp meter using a current generator incorporating a signal transmission circuit device of the present invention.

Explanation of symbols

1. Signal transmission circuit device (input / output device)
2 Multi-core cable 3 Conductor (core material)
4 Turn number switching means 5 Substrate (base)
6, 7 Connection end (connection terminal)
8, 9 Receiving side connection end 11 Current generator 12 Test device 13 Standard device 21, 22, 23 Multi-core cable 25, 26 Connector 30 CT
30a, 30b, 30c CT through hole 34 (34a, 34b) CT current output line 40 Electromagnetic switch 41 Motor relay 42 Signal output line 45 Motor 50 Clamp meter 51 Clamp unit (measurement unit)
52 Output line 53 Display

Claims (5)

A base portion, a base portion on an insulated conductor bundles is supported thereby, a plurality of insulated conductors forming the coil-shaped conductor as a whole becomes a series alternately with each insulated conductor which forms the base on the insulated conductor bundles A base outer insulated conductor bundle, and a turn number switching means that is connected to the base upper insulated conductor bundle or the base outer insulated conductor bundle and switches the number of turns in which the coiled conductor path can be energized. The coil-shaped conductor path is formed after the base outer insulated conductor bundle is inserted through the annular iron core of the counterpart device, and the signal is exchanged with the counterpart device by electromagnetic induction. A signal transmission circuit device. 2. The signal transmission circuit device according to claim 1 , wherein at least one end of the base outer insulated conductor bundle is detachably connected to the base upper insulated conductor bundle. 3. The signal transmission circuit device according to claim 1, wherein at least one end of the base outer insulated conductor bundle is detachably connected to the base upper conductor bundle via a male and female connector. Said base outer insulated conductor bundle, the signal transfer circuit device according to any one of claims 1 to 3, which is a multi-core insulated wire. The signal transmission circuit device according to claim 4 , wherein the multi-core insulated wire is a LAN cable or a flat cable.

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