JP2001165964A - Circuit breaker with current conduction information- measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a current conduction information-measuring device for a circuit breaker to which power can be easily supplied independently of voltage classification of an electrical circuit to a circuit breaker, though a conventional current conduction information-measuring device of a conventional circuit breaker measures and operates, by supplying power for operating the current conduction information measuring device to a power circuit in the device through external power. SOLUTION: A power supply terminal 25 of the device 15 is provided on the back side of the breaker 1, by electrically connecting to a power side main conductor 26 through a screw part 27 tightening the power side main conductor 26 of the circuit breaker 1 connecting the terminal 25 for the device 15 to a power side terminal part 29 with a base part 28 of the circuit breaker 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker with an energization information measuring device for measuring energization information such as current, voltage and electric power for energizing the circuit breaker.

[0002]

2. Description of the Related Art FIG. 7 shows, for example, Japanese Patent Application Laid-Open No. 9-109179.
FIG. 1 is a block diagram showing a conventional circuit breaker with a current-carrying information measuring device disclosed in Japanese Patent Application Publication No. JP-A-2006-133125. In the figure, 1 is a circuit breaker main body, 2 is an energized main conductor for energizing a load, 3 is a switching contact for turning on and off the current of the energized main conductor 2, and 4 is a transformer for detecting a current flowing through each energized main conductor 2. It is a sink. Reference numeral 5 denotes a rectifier circuit for rectifying the output of the current transformer 4, and reference numeral 6 denotes a current-carrying main conductor 2 that performs voltage conversion, A / D conversion processing, and the like on the output from the rectifier circuit 5.
A peak value conversion circuit for detecting the instantaneous maximum value of the current flowing through the circuit, 7 is an instantaneous timed circuit for outputting a signal when the output of the peak value conversion circuit 6 exceeds a predetermined value, and 8 is a level lower than the operation output of the instantaneous timed circuit 7 This is a short time limit circuit that performs a counter time operation according to the magnitude of the output of the peak value conversion circuit 6 and outputs a signal. Reference numeral 9 denotes an effective value conversion circuit that performs voltage conversion, A / D conversion processing, and the like on the output from the rectifier circuit 5 to obtain an output corresponding to the effective value of the current flowing through the current-carrying main conductor 2; Due to the magnitude of the output of the effective value conversion circuit 9, the circuit breaker does not perform the breaking operation at the rated current, but performs the counter-timed operation at the rated current or more to output a signal. Reference numeral 11 denotes a trigger circuit, which includes an instantaneous timed circuit 7, a short timed circuit 8, and a long timed circuit 1.
In response to a signal output from any one of the switches, the switching contact 3 is turned off via the electromagnetic coil 12 to cut off the power supply to the load.

[0003] Reference numeral 13 denotes a measuring current transformer for detecting a current flowing through each conductor 2 separately from the current transformer 4 for detecting an overcurrent, and 14 denotes a transformer for detecting a voltage between the conductors 2. Reference numeral 15 denotes an energization information measurement unit, and 16 denotes an output from the current transformer 13 for measurement.
A current A / D conversion circuit for obtaining a digital output corresponding to the current flowing through the current-carrying main conductor by performing a D conversion process or the like; 17 performs an A / D conversion process or the like on an output from the transformer to correspond to an inter-phase voltage; This is a voltage A / D conversion circuit for obtaining a digital output.
Reference numeral 18 denotes a maximum current value storage circuit which stores and stores the latest maximum current value in the conductor 2 by peak hold. 1
9 is a current A / D conversion circuit 16 and a voltage A / D conversion circuit 17
, And obtains an output corresponding to the power of the load. Reference numeral 20 denotes an integrating circuit that integrates the output from the multiplying circuit 19 to generate an electric energy. The output from each circuit is input to the display unit 22 via the display content selection unit 21 to display the energization measurement result. These processes are executed by a microprocessor (not shown). The operating power of the energization information measuring unit 15 including the microprocessor is supplied by transforming the external power supply 24 by the power supply circuit 23.

[0004]

In a conventional circuit breaker with an energization information measuring device, power for operating the energization information measuring device is supplied to a power supply circuit in the energization information measuring device via an external power supply. Information is being measured. Therefore, it is necessary to wire an external power supply for supplying to the energization information measuring device separately from the energization information measuring device, and there is a problem that the wiring becomes complicated. Further, when an external power supply to be supplied to the power supply circuit in the power supply information measuring device is connected to the load side circuit of the circuit breaker with power supply information measurement (that is, the external power supply conductor connected to the load side terminal of the circuit breaker), When the circuit breaker performs a breaking operation due to an overcurrent, power is not supplied to the power supply circuit of the power supply information measuring device. Therefore, when a function for outputting the ON / OFF state of the circuit breaker as an alarm output is provided in the energization information measuring device, the maximum value of the energizing current and the inter-phase voltage and the electric energy are stored in the energizing information measuring device. In such cases, there is a problem that such information is lost. In addition, it is necessary to connect an external power supply to the load-side circuit, and a space is required at the connection portion. Therefore, when the circuit breaker with the energization information is installed, there is a problem that the arrangement and mounting are poor. Furthermore, since the external power supply is connected to the load-side circuit by the wiring outside the circuit breaker, the wiring length and the wiring position vary, which may adversely affect noise.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made in view of the following problems. It is an object of the present invention to provide a circuit breaker with an energization information measuring device that can supply power to a circuit breaker. It is another object of the present invention to provide a circuit breaker with an energization information measurement device that can easily supply power to the energization information measurement device regardless of the voltage type of an electric circuit connected to the circuit breaker.

[0006]

According to the present invention, there is provided a circuit breaker energization information measuring apparatus for measuring energization information for energizing a circuit breaker. And a power supply terminal connected to a power supply conductor on the power supply side of the circuit breaker and forming a control power supply of the power supply information measuring device. .

The power supply terminal is connected to a terminal on the power supply side of the circuit breaker from the bottom of the circuit breaker. The power supply terminal is attached to a fixing screw for fixing a connection conductor on the power supply side of the circuit breaker to the circuit breaker. Still further, a transformer electrically connected between the power supply terminal and the power supply information measuring device is provided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a circuit configuration block diagram of a circuit breaker energization information measuring device according to a first embodiment of the present invention, FIG. 2 is a back view of the circuit breaker, and FIG. 3 is a cross-sectional view of a power supply side terminal portion of the circuit breaker. It is. In the figure, reference numerals 1 to 23 are the same as those in the above-described conventional technique, and thus the description thereof is omitted. 1a is an arc extinguishing device for extinguishing an arc, and 1b is a barrier provided with a plurality of ventilation holes. When the arc is interrupted, a high pressure is generated in the circuit breaker 1 based on the arc generated between the contacts, and the circuit breaker 1
The high pressure gas inside the circuit breaker 1 is released by passing the gas through the ventilation hole in the direction of arrow A.

Reference numeral 25 denotes a power supply terminal for an energization information measuring device, comprising a wiring mounting screw 25a and a mounting conductor 25b made of, for example, copper. 27 is a circuit breaker 1
The power supply side main screw 26 is a screw for tightening the power supply unit 28a of the base 28 of the circuit breaker 1 and the main conductor 26 via the mounting conductor 25b. In this manner, the mounting conductor 25b is electrically connected to the power source side main conductor 26. The power supply terminals 25 may be provided at at least two places (two or all) on the power supply side main conductor 26 of the circuit breaker 1. By wiring between the power supply circuit 23 and the power supply terminal 25 of the energization information measurement device 15,
A control power supply (circuit power supply) is supplied to the energization information measurement device 15.

As described above, the power supply terminal 25 for supplying power to the power supply information measuring device 15 is provided on the bottom side (back side) of the circuit breaker 1, and power is supplied via the power supply terminal 25. There is no need to connect the power supply terminal 25 outside the circuit breaker 1, so that the arrangement including the circuit breaker 1 and the power supply terminal 25 can be easily installed and mounted, and the circuit breaker 1 can be enlarged in the overall length direction. Absent. Further, since the power supply terminal 25 is provided from the bottom of the circuit breaker 1, that is, the power supply terminal 25 is provided on the opposite side to the current-carrying main conductor 26 via the power supply portion 28a of the base 28, the arc is cut off by the opening and closing of the switching contact 3. Sometimes, the power supply terminal 25 and the wiring connected to the terminal 25 are not mechanically and chemically deteriorated without being exposed to the high-pressure gas generated based on the arc.

Since the power supply terminal 25 has a wire mounting screw 25a separately from the screw portion 27, the power supply terminal 2
5, especially the wiring fixing screw 25a is not affected by the rotational force when the screw portion 27 is tightened to the current-carrying main conductor 26. Further, the wiring mounting screw 25a of the power supply terminal 25
Is provided, the current-carrying main conductor 26 is connected to the base 28 by the screw 2
After fixing with 7, the wiring can be attached to the wiring attaching screw 25a, and the assembling property is good. Note that a configuration may be adopted in which the screw portion 27 also serves as the wiring mounting screw 25a for mounting the wiring. In this case, the power supply terminal 25 becomes unnecessary, so that the arrangement space can be further reduced. At this time, it is preferable that the wiring be connected to a washer (not shown) of the screw portion 27 in order to avoid the influence of the rotational force when the screw portion 27 and the current-carrying main conductor 26 are tightened.

Embodiment 2 FIG. FIG. 4 is a side view partially showing a circuit breaker conduction information measuring device according to a second embodiment of the present invention. In the drawing, reference numeral 1B denotes an opening / closing mechanism for opening / closing the opening / closing contact, and 1C denotes a trip detecting device for detecting a current flowing through the circuit breaker 1 and operating the switching mechanism 1B based on the current value. Reference numeral 36 denotes a load-side main conductor. A connection conductor 3a provided on the switching contact 3 is connected to one end by a connection screw 36a, and a load-side terminal 39 is connected to the other end. The current is supplied to the power supply side terminal 29, the power supply side main conductor 26, the switching contact 3, the load side main conductor 3 of the circuit breaker 1.
6. Energize through the load terminal 39.

Reference numeral 15 denotes an energization information measuring device in which the components are housed in a unit case and unitized, 23a denotes a transformer for stepping down an alternating current, and 23b converts an output of the transformer 23a to direct current to convert an energization information measuring device 15 to a direct current. This is a converter for supplying drive power to a circuit (not shown) in the inside. 28b is a groove provided on the base 28 for storing the wiring 40,
Is a hole provided in the base 28 and through which the wiring 40 passes.
Reference numeral 40 denotes wiring for electrically connecting the power supply terminal 25 and the power supply information measuring device 15. The wiring 40 has a predetermined length from the power supply information measuring device 15, that is, a fixed length that can be connected to the power supply terminal 25. It is connected to the energization information measuring device 15. The other configuration is the same as that of the first embodiment, and a description thereof will be omitted.

Next, the connection between the power supply information measuring device 15 and the power supply terminal 25 will be described. After the assembly of the circuit breaker 1 is completed, the energizing information measuring device 15 corresponding to the rating (voltage, current) of the electric circuit to which the circuit breaker 1 is connected is attached to the energizing information measuring device mounting portion 1E of the circuit breaker 1. It is inserted and attached, that is, the energization information measuring device 15 having the transformer 23a corresponding to the rating of the electric circuit is attached. At this time, the wiring 40 connected to the energization information measuring device 15 is drawn out of the circuit breaker 1 through the hole 28c. Next, the wiring drawn out from the hole 28c is inserted along the groove 28b, and the wiring terminal screw 25a is tightened to connect the end of the wiring 40 to the power supply terminal 25. Note that the wiring 40 is formed in the groove 28b.
It is preferable to cover the groove 28b with a cap (not shown) so that the wiring 40 is not exposed to the outside.

As described above, since the transformer 23a is configured to be housed in the energization information measuring device 23a, wiring and assembly are facilitated. Before the circuit breaker 1 is mounted on an installation panel or the like, the power supply terminal 25 and the conduction information measuring device 1 are connected.
5 can be connected, for example, at the time of shipment from a factory, so that the burden on the switchboard or the like can be reduced, and wiring errors do not occur. Further, since the wiring 40 is provided in the circuit breaker 1, the wiring 40 does not break when the circuit breaker 1 is mounted. Furthermore, since the wiring 40 is mounted in the circuit breaker 1, the length of the wiring 40 can be set to a predetermined length and a predetermined position, and the noise resistance is excellent.

Embodiment 3 FIG. 5 is a circuit configuration block diagram of a circuit breaker energization information measuring device according to Embodiment 3 of the present invention, and FIG. 6 is a front view of the circuit breaker energization information measuring device. In the figure, reference numeral 30 denotes a power supply unit, which is a transformer for transforming power supplied from a power supply terminal 25 provided in the circuit breaker 1 and supplying the transformed power to the power supply circuit 23 of the circuit breaker conduction information measuring device 15. Is built-in. The type of voltage output from the power supply unit 30 does not change depending on the input voltage. The power supply unit 30 can be attached to the side of the circuit breaker 1. Reference numeral 32 denotes an accessory terminal block that outputs an output signal of an accessory (not shown) provided inside the circuit breaker 1 to the outside of the circuit breaker 1. Here, it is preferable that the thickness of the power supply unit 30 be equal to or less than the thickness of the attached terminal block 32. Other configurations are the same as those of the first and second embodiments, and thus description thereof will be omitted.

As described above, by providing the power supply unit 30, the rating (voltage,
Current), the energization information measuring device 15 of the circuit breaker 1
It can be used without changing the power supply circuit 23 inside. If the thickness of the power supply unit 30 is equal to or less than the thickness of the attached terminal block 32, the circuit breaker to which the attached terminal block 32 is attached when the power supply unit 30 is attached to the side of the circuit breaker 1. The outer dimension of 1 does not increase.

[0018]

According to the present invention, an energization information measuring device for a circuit breaker is provided on a power supply side of the circuit breaker in a circuit breaker with an energization information measuring device for measuring energization information for energizing the circuit breaker. A detecting means for detecting the energization information, and connected to an energizing conductor on the power supply side of the circuit breaker,
A power supply terminal for forming a control power supply for the energization information measuring device, so that the power supply to the energization information measuring device can be performed regardless of the ON / OFF state of the circuit breaker without deteriorating the arrangement and installation of the circuit breaker. A circuit breaker with an energization information measuring device that can be supplied can be provided.

Further, since the power supply terminal is connected to the terminal on the power supply side of the circuit breaker from the bottom of the circuit breaker,
Without being exposed to the gas generated by the arc,
The power supply terminal and the wiring connected to this terminal are mechanical,
There is no chemical deterioration.

Further, since the power supply terminal is mounted on the fixing screw for fixing the connection conductor on the power supply side of the circuit breaker to the circuit breaker, the circuit breaker can be connected without increasing the size of the circuit breaker. Is good.

Furthermore, since a transformer electrically connected between the power supply terminal and the power supply information measuring device is provided,
Regardless of the rating of the electric circuit connected to the circuit breaker, the versatility of the energization information measuring device 15 is high.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an energization information measuring device for a circuit breaker according to Embodiment 1 of the present invention.

FIG. 2 is a back view of the circuit breaker according to Embodiment 1 of the present invention.

FIG. 3 is a sectional view showing a power supply side terminal portion of the circuit breaker according to Embodiment 1 of the present invention.

FIG. 4 is a side view showing a partial cross section of a power supply side terminal portion of a circuit breaker according to Embodiment 2 of the present invention.

FIG. 5 is a block diagram showing a circuit configuration of a circuit breaker energization information measuring device according to a third embodiment of the present invention.

FIG. 6 is a front view of an energization information measuring device for a circuit breaker according to Embodiment 3 of the present invention.

FIG. 7 is a block diagram showing a conventional example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Circuit breaker main body, 2 Energized main conductor, 3 Switching contact 15 Energized energization information measurement unit, 23 Power supply circuit, 24 External power supply 25 Power supply terminal, 26 Power supply side main conductor, 2
7 Screw part 28 Base part, 29 Power supply side terminal part, 30
Power supply unit

Claims (4)

[Claims] 1. A circuit breaker with an energization information measuring device for measuring energization information for energizing a circuit breaker, provided on a power supply side of the circuit breaker, detecting means for detecting the energization information; And a power supply terminal connected to a current-carrying conductor on the power supply side of the vessel and forming a control power supply of the current-carrying information measuring device. 2. The circuit breaker with an energization information measuring device according to claim 1, wherein the power supply terminal is connected to a terminal portion on a power supply side of the circuit breaker from a bottom direction of the circuit breaker. 3. The circuit according to claim 1, wherein the power supply terminal is mounted on a fixing screw for fixing a connection conductor on the power supply side of the circuit breaker to the circuit breaker. Circuit breaker. 4. The circuit breaker with an energization information measuring device according to claim 1, further comprising a transformer electrically connected between the power supply terminal and the energization information measuring device.