JPH11289613A - Control power device for panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a control power device for panels having a circuit breaker, which protects various kinds of power sources for control apparatuses in a control panel collectively, requires a smaller occupied space in the panel, and simplifies wiring work in the panel. SOLUTION: A circuit is interrupted by providing a plural electrode current sensors 20, a circuit breaker which cuts off an input power circuit S1 for control loads via a switch mechanism 19, when at least one out of a plurality of electrodes of this current sensor 20 detects a specified current, controls power units 25, 26 provided in circuits branched from the input power circuit S1 for control loads and formed, so as to generate specified AC or DC voltages in order to control the control loads, and a housing member 12 which houses the circuit breaker and the control power units 25, 26 collectively, and detecting abnormality of current with the current sensor 20, when the currents of the input power circuit S1 for control loads and the circuits of the control power units S2, S3 become abnormal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control power supply for a panel provided inside a switchboard or a control panel, and more particularly to a control for a panel in which a plurality of types of control circuits for various control devices are protected from overcurrent. Power supply.

[0002]

2. Description of the Related Art FIG. 8 is a wiring diagram showing a configuration of a power distribution and control circuit of a conventional control panel. In the figure, 1 is a main breaker, 2 is a branch breaker, 3 is an electromagnetic switch, and 4 is a load device that is controlled to open and close via the electromagnetic switch 3. 5
Denotes an input power supply circuit S for a control load (hereinafter referred to as a main circuit S)
Is a transformer that reduces the voltage of the main circuit to a control voltage.
In many cases, an instrument transformer for voltage measurement is also used.
Reference numeral 6 denotes a control power breaker for opening / closing and protecting the power supply of a control load device in the control panel. Reference numeral 7 denotes a low-voltage DC power supply, which further reduces and rectifies the control voltage reduced by the transformer 5 to reduce the DC low voltage. Is output. Reference numeral 8 denotes a circuit protector for protecting the low-voltage DC power supply 7. 9 is a control contact,
The energization of the excitation coil 3a of the electromagnetic switch 3 is remotely controlled to switch the load device 4 on and off.

Reference numeral 10 denotes an indicator light, which is turned off and turned on in synchronization with the opening and closing of the electromagnetic switch 3 by an auxiliary contact of the control contact 9 or an auxiliary contact of the electromagnetic switch 3. Is displayed on the control panel. In some cases, an AC control power supply from the control power breaker 6 is used as a power supply for the indicator lamp 10, but a low-voltage DC power supply 7 of 24 V or less is generally used to facilitate wiring in the panel. In recent years, an electronic control device using a microprocessor is often incorporated in a panel.
Opportunities for preparing low-voltage DC power supplies are increasing.

[0004]

As described above, in the conventional control panel, a circuit protector 8 for protecting a low-voltage DC power supply 7 is connected to a control power breaker 6 in the panel. It had a sensor and an overcurrent trip mechanism. For this reason, wiring for connecting each of the control power supply breaker 6, the low-voltage DC power supply 7, and the circuit protector 8 is required, and an extra wiring work is required for a panel manufacturer. In addition, a space for disposing each of these devices in the panel is required, which is an obstacle to downsizing the control panel.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can collectively protect various control device power supplies in a panel, reduce the space occupied in the control panel, and reduce the space in the panel. It is an object of the present invention to provide a control power supply for a panel which can simplify the wiring work of the panel.

[0006]

A control power supply for a panel according to the present invention has a plurality of current sensors. When at least one of the current sensors detects a predetermined current, an opening / closing mechanism is provided. A circuit breaker for separating the control load input power supply circuit through the control load input circuit and a circuit branched from the control load input power supply circuit to generate a predetermined AC or DC voltage for controlling the control load. A control power supply unit formed as described above, and a storage member that integrally stores the circuit breaker unit and the control power supply unit, and when there is an abnormality in the current of the control load input power supply circuit and the circuit of the control power supply unit, The circuit is interrupted by detecting with a current sensor.

Further, the control power supply generates a low-voltage DC voltage, and the current sensor for detecting the state of the circuit current of the control power supply detects the DC current to cut off the circuit. It is.

The current sensor includes an oil dash pot iron core, a trip coil wound around the oil dash pot core, and is attracted to the oil dash pot core when a predetermined current flows through the trip coil. And a movable iron piece for operating the opening / closing mechanism.

The current sensor detects a voltage drop which is proportional to the DC current flowing through the control power supply.

[0010] Further, each of the plurality of current sensors is provided with display means for individually displaying the detection of the overcurrent when the overcurrent is detected.

Further, a display button urged so as to protrude to a visible position, a locking lever for normally locking the display button at a predetermined position, and a locking lever when the oil dash pot is sucked by the iron core. A movable iron piece formed to be engaged with the lever to release the locking of the display button is provided in each oil dashpot type current sensor.

Furthermore, a zero-phase current transformer for detecting a leakage of a power supply circuit for control equipment, and a leakage detection circuit for detecting an output of the zero-phase current transformer and generating a predetermined output signal,
It is mounted on a mounting member integrally with a circuit breaker section and the like, and a DC control power supply for operating the leakage detection circuit is obtained from a control power supply section.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a configuration of a panel control power supply according to Embodiment 1 of the present invention, and FIG. 2 is a connection diagram showing a power distribution and control circuit configuration of a control panel using the panel control power supply of the present invention. . FIG.
1, 1 is a main breaker, 2 is a branch breaker, 3 is an electromagnetic switch, and 4 is a load device. Reference numeral 5 denotes a transformer for reducing the voltage of the control load input power supply circuit S1 to a control voltage, reference numeral 6 denotes a control power supply breaker, reference numeral 7 denotes a low-voltage DC power supply, and reference numeral 8 denotes a circuit protector for protecting the low-voltage DC power supply 7. Reference numeral 9 denotes a control contact, which controls the energization of the exciting coil 3a of the electromagnetic switch 3 by remote control so that the load device 4 is turned on and off. 10
Is an indicator light. These are the same as the above-mentioned conventional apparatus.

1 and 2, reference numeral 11 denotes a panel control power supply of the present invention, and reference numeral 12 denotes a housing of the panel control power supply 11. 13 is an input terminal of the control load input power supply circuit S1, and 14 and 15 are DC output terminals.
14 is a 24V output terminal, and 15 is a 12V output terminal. Reference numeral 16 denotes an output terminal of the control load input power supply circuit S1, for example, an AC 110V output terminal, which is used as a power supply for controlling the electromagnetic switch 3 and the like.

Reference numeral 18 denotes an open / close contact having an arc extinguishing means, and 19 denotes an open / close mechanism, which is operated by an operation handle (not shown) via a well-known toggle link mechanism (not shown).
Can be opened and closed, and the on-off contact 18 can be opened by releasing a latch (not shown). Reference numeral 20 denotes a current sensor for detecting overcurrents of the control load input power supply circuit S1 and the control power supply sections S2 and S3, and constitutes a trip coil of a multi-pole circuit breaker as described later. That is, 21 is a tripping coil for detecting an overcurrent of the input power supply circuit S1 for AC 110V control load, 22 is a tripping coil for detecting an overcurrent of the circuit of the DC 12V control power supply section S2, and 23 is a 24V DC control power supply section. S
This is a tripping coil that detects overcurrent in circuit 3. The current sensor 20 forms a tripping mechanism for tripping a latch (not shown) of the opening / closing mechanism 19. For example, the current sensor 20 includes a tripping coil and a movable iron piece wound around an oil dash pot iron core. It is a configuration of a pole circuit breaker.

Reference numeral 24 denotes a transformer for stepping down a circuit voltage of 110 V AC of the control load input power supply circuit S1. Reference numeral 25 denotes a rectifier forming the control power supply section S2, which converts the power into a 12V low-voltage DC power and outputs it from the output terminal 15. Reference numeral 26 denotes a rectifier forming the control power supply section S3, which converts the power into a 24V low-voltage DC power and outputs it from the output terminal 14. A trip coil 22 for detecting the current of the control power supply S2 is connected between the control power supply S2 and the secondary output of the transformer 24. A trip coil 23 for detecting the current of the control power supply S3 is provided between the control power supply S3 and the secondary output of the transformer 24.
Is connected.

The control power supply for a panel constructed as described above is provided with any one of the tripping coils 2 of the current sensors 20.
When an overcurrent of a predetermined time or more flows through the terminals 1, 22, and 23, a latch (not shown) is tripped, the opening / closing mechanism 19 is operated, the opening / closing contact 18 is separated, and both the control power and the control power are cut off.
In this case, if the current sensor 20 is configured to include the oil dash pot iron core, the movable iron piece, and the trip coil, the mechanism configuration of the existing three-pole circuit breaker can be used as it is, so that the apparatus can be manufactured at low cost. be able to. The panel control power supply 11 of the present invention
8, opening / closing mechanism 19, current sensor 20, its trip coils 21, 22, 23, transformer 24, rectifiers 25, 26,
An output terminal 16 of an AC 110 V control power supply, an output terminal 15 of a DC 12 V control power supply, and an output terminal 14 of a 24 V DC control power supply are integrally accommodated in the housing 12. The casing 12 is preferably a box made of an insulating material, but a small control panel may be a panel-shaped unit formed to be a unit.

Embodiment 2 FIG. FIG. 3 is a block diagram showing a configuration of a panel control power supply according to Embodiment 2 of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 31 denotes a detection resistor connected to the DC 12V control power supply unit S2, and 32 denotes a current detection circuit composed of an operational amplifier, a capacitor, and the like, which detects the current of the DC 12V circuit from the voltage drop of the detection resistor 31 and performs a predetermined time period. In the case of the above overcurrent, the trip coil 34 is energized through the thyristor 33. With this energization, a latch (not shown) is tripped to operate the opening / closing mechanism 19 to open / close the contact 18
To separate. Reference numeral 35 denotes a detection resistor connected to the control power supply unit S3 of 24 VDC, and 36 denotes a current detection circuit composed of an operational amplifier, a capacitor, and the like. In the case of the above overcurrent, the tripping coil 3 is connected via the thyristor 37.
8 is energized. With this energization, a latch (not shown) is tripped, the opening / closing mechanism 19 is operated, and the opening / closing contact 18 is separated. The tripping coil 21 detects an overcurrent in the input power supply circuit S1 for an AC 110 V control load, and is as described in the first embodiment.

Embodiment 3 FIG. 4 is a block diagram showing the configuration of a panel control power supply according to Embodiment 3 of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 27 denotes a zero-phase current transformer for detecting a leakage of the input power supply circuit S1 for a control load of 110 V AC. Reference numeral 28 denotes a leakage detection circuit, which activates a thyristor 29 when the detection level of the zero-phase current transformer 27 is higher than a predetermined level. Then, a leak alarm signal is output through the leak alarm output terminal 17. In response to the leakage alarm signal, a leakage alarm display device (not shown) such as an indicator lamp or a buzzer is operated. Further, an opening / closing mechanism 19 is operated by a solenoid (not shown) to open / close a contact 18.
May be disconnected to shut off both control power supplies. Further, the leakage detection level may be set to two levels, and a leakage leakage warning display may be provided for a minor leakage, and the control power may be cut off by activating the switching mechanism 19 for a leakage detection level equal to or higher than a predetermined value. Here, a 12 V DC power supply formed by the rectifier 25 is used as an operation power supply of the leakage detection circuit 28. This eliminates the need for a rectifier specifically for the leakage detection circuit 28, thereby simplifying the circuit configuration. The zero-phase current transformer 27, the leakage detection circuit 28, and the thyristor 29
2 are housed integrally.

In the control power supply for a panel configured as described above, the trip coil having the number of turns as the current sensor 21 corresponding to the load current of the control device of 110 V AC, and the transformer 2
4. Current sensor 22 that matches the current withstand capability of rectifier 25
Of the number of windings as transformer, transformer 24, rectifier 2
6. A trip coil having the number of turns as the current sensor 23 corresponding to the current withstand capability of No. 6 is provided in parallel, and the same opening and closing is performed when an overcurrent flows in any one of the trip coils for a predetermined time period or more. By pressing the latch of the mechanism 19 to cut off the AC and DC control power, the circuit can be protected even if there is an accident due to overcurrent of any control power system. Since the transformer 24, the rectifiers 25 and 26, and the leakage detecting mechanism for forming the DC control power supply are housed integrally, the space occupied in the panel can be reduced, and the apparatus for forming the DC control power supply at the time of manufacturing the panel. Wiring work between them can be eliminated.

Embodiment 4 FIG. 5 and 6 are partial cross-sectional views of a panel control power supply device according to Embodiment 4 of the present invention. FIG. 5 shows an energized state of the panel control power supply device. FIG. (Trib state). FIG. 7 is a plan view schematically showing the display button device section. In the figure, 12 is a housing, 13 is an input terminal, 18 is a switching contact, 1
9 is an opening / closing mechanism, 20 is a current sensor, 21 is a trip coil, and 27 is a zero-phase current transformer, which are the same as those described in the third embodiment. Reference numeral 19a denotes an operation handle, and 19b denotes a latch, which is a part of components constituting the opening / closing mechanism 19. The description of other parts of the opening / closing mechanism 19 is omitted. 20a is an oil dash pot iron core, 20b
Is a movable iron piece, and 20c is a yoke, which constitutes the current sensor 20.

Reference numeral 41 denotes a support frame based on the yoke 20c and the oil dash pot core 20a. Reference numeral 42 denotes a bar-shaped display button, which is inserted through a through hole provided in the support frame 41 and moves in the vertical direction shown in the figure. It is formed to be possible. The upper end of the display button 42 faces the through hole 12a provided on the upper surface of the housing 12, and is formed so as to be visible. The display button 42 is provided with a locking step 42a, which is urged upward by a spring 43 in the figure. Reference numeral 44 denotes a locking lever, which is pivotally supported by a support shaft 45 provided on the support frame 41,
It is urged clockwise by an urging spring (not shown). A hook 44a provided at one end of the locking lever 44 is engaged with the locking step 42a to lock the display button 42. Note that the other end of the locking lever 44 is pressed by the movable iron piece 20b during an overcurrent operation, and
The hook 44a is formed so that the engagement between the hook 44a and the locking step 42a is released when the is rotated counterclockwise.

As described above, the hook 41a engaged with the locking step 42a is released by the rotation of the locking lever 44 in the counterclockwise direction, and the display button 42 is pressed by the spring 42 so that the display button 42 is pressed. The upper end protrudes from the upper surface of the housing 12 to indicate that an overcurrent operation has been performed. The protruding display button 42 is pushed back so that the hook 4
1a is locked and reset.

Such a display button device is provided for each power supply, and three display button devices are mounted side by side as shown in FIG. Although not shown in the sectional views of FIGS. 5 and 6 because they are overlapped, an oil dash pot iron core 20a around which a trip coil 21 of a current sensor of a control power supply of 110 V AC is wound, and a trip of a 12 V DC power supply are tripped. An oil dash pot core 20a around which the coil 22 is wound and an oil dash pot core 20a around which a trip coil 23 of a DC 24V power supply is wound are arranged in parallel.
Each movable iron piece 20b operated by each trip coil engages with the latch 19b of the opening / closing mechanism 19, and the shut-off operation is performed even if any trip coil detects an overcurrent of the control power supply.

Accordingly, it is possible to determine that only the control power load display button 42 that has undergone the cutoff operation protrudes, and that an abnormality has occurred in the control power load, thereby facilitating recovery measures. The housing 12 also serves as a housing of a circuit breaker unit including an opening / closing mechanism 19 and a current sensor 20, and integrally includes a zero-phase current transformer 27, a leakage detection circuit 28, a control power supply unit S2, and the like. It is a storage member for storing.

[0026]

Since the present invention is configured as described above, it has the following effects.

By using the tripping coils of the multi-pole circuit breaker individually as current sensors, abnormal current states of the control load input power supply circuit and various control power supply circuits can be monitored by the common circuit breaker section. Can be protected. Therefore, the space occupied in the control panel can be reduced, and the wiring work in the panel can be simplified.

Depending on the number of control load input power supply circuits and control power supply circuits, the existing three-pole circuit breaker mechanism can be used as it is, so that the apparatus can be manufactured at low cost.

As an operating power supply of the leakage detecting circuit, a DC power supply using a rectifier of a control power supply unit is used. This allows
Since no rectifier is required for the leakage detection circuit, the circuit configuration is simplified. And also a zero-phase current transformer,
Since the leakage detection circuit and the thyristor 29 are also housed integrally in the housing 12, the space occupied in the control panel can be reduced, and the wiring work in the panel can be simplified.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a panel control power supply device according to a first embodiment of the present invention.

FIG. 2 is a connection diagram showing a power distribution and control circuit configuration of a control panel using the panel control power supply device of the present invention.

FIG. 3 is a block diagram showing a configuration of a panel control power supply device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a panel control power supply device according to a third embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a panel control power supply according to Embodiment 4 of the present invention.

FIG. 6 is a partial cross-sectional view of a panel control power supply according to Embodiment 4 of the present invention.

FIG. 7 is a schematic plan view of a display button device according to a fourth embodiment.

FIG. 8 is a connection diagram showing a power distribution and control circuit configuration of a conventional control panel.

[Explanation of symbols]

11 control power supply for panel, 12 housing, 14, 15, DC power output terminal, 16 control power output terminal, 18 switching contact, 19 switching mechanism, 20 current sensor, 20a
Oil dash pot iron core, 20b Movable iron piece, 20c
Yoke, 21, 22, 23 Trip coil, 25, 26
Rectifier, 27 Zero-phase current transformer, 28 Leakage detection circuit, S
1 Control load input power supply circuit, S2, S3 control power supply section.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mamoru Yagisawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (7)

[Claims] 1. A circuit breaker having a plurality of current sensors, wherein when at least one of the current sensors detects a predetermined current, the circuit breaker opens a control load input power supply circuit via a switching mechanism. A control power supply unit provided in a circuit branched from the control load input power supply circuit and configured to generate a predetermined AC or DC voltage for controlling the control load; and the circuit breaker unit. And a storage member for integrally storing the control power supply unit, wherein the current state of each of the control load input power supply circuit and the control power supply unit circuit is detected by the current sensor. Control power supply for panel. 2. A control power supply unit for generating a low-voltage DC voltage, and a current sensor for detecting a state of a circuit current of the control power supply unit detects a DC current. Item 2. A control power supply for a panel according to Item 1. 3. A current sensor comprising: an oil dash pot core; a trip coil wound around the oil dash pot core; and a predetermined coil that is attracted to the oil dash pot core when a predetermined current flows through the trip coil. 3. The control power supply for a panel according to claim 1, further comprising a movable iron piece for operating the opening and closing mechanism. 4. The control power supply for a panel according to claim 2, wherein the current sensor detects a voltage drop generated in proportion to a DC current flowing through the control power supply. 5. The system according to claim 1, wherein each of the plurality of current sensors includes display means for individually displaying the detection of the overcurrent when the overcurrent is detected.
The panel control power supply device according to any one of claims 1 to 4. 6. A display button urged so as to protrude to a visible position, a locking lever for normally locking the display button at a predetermined position, and a locking lever when attracted by an oil dash pot iron core. 4. The control power supply for a board according to claim 3, wherein a movable iron piece formed to engage with the lever to release the locking of the display button is provided for each current sensor. 7. A circuit breaker unit comprising: a zero-phase current transformer for detecting a leakage of a power supply circuit for a control device; and a leakage detection circuit for detecting an output of the zero-phase current transformer and generating a predetermined output signal. The DC power supply for operating the earth leakage detection circuit is obtained from a control power supply unit integrally with the mounting member, and the like. Panel control power supply according to the item.