CN106847641A - Combined starter - Google Patents

Abstract

The present invention provides the reduction that can realize miniaturization and manufacturing cost and the combined starter for possessing earth leakage detection functions.In circuit between power supply and load, circuit-breaker (2) is connected in series with electromagnetic contactor (4) via coupling assembly (3), and the detection of electrical leakage portion (15,16,17) of the electric leakage of detection circuit is built-in with coupling assembly.

Description

Integrated starter

technical field

The present invention relates to an integrated starter used as protection and control equipment for electric motors.

Background technique

A switch unit called an integrated starter is known as a device for protection and control of a motor (for example, non-patent document 1). This combined starter consists of a circuit breaker (circuit breaker for wiring) known by the name of a manual motor starter (MMS) that integrates the functions of a circuit breaker and a thermal relay, and an electromagnetic contactor to form a unit. Carry out overload and short-circuit protection, operation and stop control of the motor with a compact structure.

In the case of an integrated starter in a panel such as a control panel, in the prior art, a connection assembly of special accessories is installed between the circuit breaker (manual motor starter) and the electromagnetic contactor, and the circuit is disconnected through the connection assembly. Electrically and mechanically connect the load-side terminal of the electromagnetic contactor to the power-side terminal of the electromagnetic contactor (for example, non-patent document 1, patent document 1).

prior art literature

non-patent literature

Non-Patent Document 1: Product catalog "Fuji Manual Motor Starter Integrated Starter" (page 6-7), [Online], Fuji Electric Machine Seizure Co., Ltd., [retrieved on October 10, 2007], Internet <http: //www.fujielectric.co.jp/fcs/jpn/edc/catalog2/EH530b/EH530b_1.pdf>

(Product Catlog "Fuji Maniyu Al Motors Star タコンビネーションスタータ" (page 6-7), [online], Fuji Electric Machine Seizure Co., Ltd., [October 10, 2019], InterNet <http://www.fujielectric .co.jp/fcs/jpn/edc/catalog2/EH530b/EH530b_1.pdf＞)

patent documents

Patent Document 1: US Patent Specification No. 6472621B2

Contents of the invention

The problem to be solved by the invention

Therefore, it is considered to connect the leakage detection unit to the integrated starter to increase the leakage detection function.

However, if the earth leakage detection means is arranged around the integrated starter, the external dimensions will increase to become a large device, and there is a problem in terms of manufacturing cost.

Therefore, an object of the present invention is to provide an integrated starter capable of reducing the size and manufacturing cost and having an electric leakage detection function.

Technical solutions for problem solving

In order to achieve the above object, in the integrated starter according to one aspect of the present invention, in the circuit between the power supply and the load, a circuit breaker and an electromagnetic contactor are connected in series via a connection unit, and a leakage detection for detecting the leakage of the circuit is built in the connection unit. department.

The effect of the invention

According to the integrated starter of the present invention, miniaturization and reduction of manufacturing cost can be realized, and an electric leakage detection function is provided.

Description of drawings

FIG. 1 is a diagram showing a circuit configuration of an integrated starter according to a first embodiment of the present invention.

Fig. 2 is a diagram showing the appearance of the combined starter according to the first embodiment of the present invention.

Fig. 3 is a view showing a connection unit constituting the combined starter according to the first embodiment, viewed from the side connected to the circuit breaker.

Fig. 4 is a sectional view of a connection assembly constituting the integrated starter structure of the first embodiment.

detailed description

Next, a first embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar reference numerals are attached to the same or similar parts. However, the drawings are schematic diagrams, and it should be noted that the relationship between the thickness and the plane size, the ratio of the thickness of each layer, and the like are different from the actual relationship and ratio. Therefore, the specific thickness and size should be judged with reference to the following description. In addition, of course, the relationship and the ratio of the mutual dimension also contain the part which differs among drawings.

In addition, the first embodiment shown below is an example of a device and a method for realizing the technical idea of the present invention, and the material, shape, structure, arrangement, etc. of the components in the technical idea of the present invention are not limited by the following Decide. The technical idea of the present invention can be variously modified within the technical range defined by the claims described in the scope of the patent claims.

As shown in FIGS. 1 and 2 , an integrated starter 1 according to a first embodiment of the present invention is constituted by connecting a circuit breaker 2 , a connection unit 3 and an electromagnetic contactor 4 in series in a circuit between a power source and a load.

The circuit breaker 2 includes a main circuit 5 of three phases R, S, and T, an opening and closing contact 6 for opening and closing the conductor of the main circuit 5, an opening and closing mechanism 7 for opening and closing the opening and closing contact 6, and The opening and closing handle 8 for opening and closing operation of the opening and closing mechanism 7 and the voltage tripping device 9 for opening and closing the opening and closing mechanism 7 to disconnect (disconnect) the opening and closing contacts 6 . In addition, the voltage trip device 9 can be configured as an external accessory, and by electrically connecting a leakage detection circuit described later to the voltage trip device 9 , an electric leakage detection signal can be output to the voltage trip device 9 .

The electromagnetic contactor 4 includes a main circuit 12 of three phases of R, S, and T, a fixed contact 12 a provided on a conductor of the main circuit 12 , and a movable contact 12 b that contacts and separates from the fixed contact 12 a.

The connection unit 3 includes load-side terminals 10 a to 10 c connected to the conductors of the main circuit 5 of the three phases R, S, and T of the circuit breaker 2 and the three phases R, S, and T of the electromagnetic contactor 4 . The conductors of the main circuit 12 are connected to the three conductive connection lines 14a-14c of the power supply-side terminals 13a-13c.

The connection assembly 3 includes a zero-sequence current transformer 15 and a printed circuit board 17 printed with a leakage detection circuit 16 . Leakage detection circuit 16 is supplied with operating power from power supply circuit 19 constituted by a rectifier circuit connected to conductors of main circuit 5 of circuit breaker 2 via power supply line 18 .

The zero-sequence current transformer 15 includes a ring-shaped core (not shown) and a coil (not shown) wound toroidally around the periphery of the ring-shaped core. Conductive connecting wires 14a-14c.

In the integrated starter 1 of the above-mentioned structure, when the current flowing in the three conductive connection lines 14a-14c becomes unbalanced due to leakage, the zero-sequence current transformer will 15 The flux state of the toroidal core changes. As a result, an induced voltage is generated in the coil of the zero-sequence current transformer 15, and a voltage corresponding to the leakage current is generated across the coil, and this voltage is output to the leakage detection circuit 16 as a leakage detection signal. And the electric leakage detection circuit 16 to which the electric leakage detection signal was input outputs an opening control signal to the voltage trip device 9 . Thereby, in the circuit breaker 2, the voltage trip device 9 controls the opening and closing mechanism 7 to open, and the switching contact 6 is disconnected (opened).

Next, FIG. 3 and FIG. 4 show the structure of the connection unit 3 in detail.

As shown in Figure 3, the connection assembly 3 is equipped with conductive connection wires 14a-14c, electronic components such as zero-sequence current transformers 15 and capacitors 20, and printed leakage detection circuits 16 inside the assembly housing 21. circuit board 17.

As shown in FIG. 4 , the component case 21 includes a case main body 22 and a first cover part 28 and a second cover part 29 detachably mounted on the case main body 22 .

The case main body 22 is formed with a mounting table 23 on which the electromagnetic contactor 4 is placed, and includes a first storage space 25 on the side connected to the circuit breaker 2 ( FIG. 4 ) and a second storage space 27 . The left side) opens, and the second storage space 27 and the first storage space 25 are provided with the partition wall 26 interposed therebetween.

Electronic components such as zero-sequence current transformer 15 and capacitor 20 , and printed circuit board 17 are stored in first storage space 25 .

The zero-sequence current transformer 15 is soldered with a coil wound around the outer periphery of the annular core at a predetermined position on the printed circuit board 17 , and is installed in a state where one end surface of the annular core in the axial direction is in contact with the mounting surface of the printed circuit board 17 . A substrate insertion hole 30 is formed in the printed circuit board 17 facing the cavity portion 15 a of the zero-sequence current transformer 15 .

The connection wire guide part 31 extended to the cavity part 15a of the zero-sequence current transformer 15 is fixed to the inner periphery of the board|substrate insertion hole 30 of the printed circuit board 17. As shown in FIG. As shown in FIG. 3 , the connecting wire guide portion 31 is formed so that its cross section is substantially Y-shaped, and is formed by three guide recesses 31 a to 31 c formed in the circumferential direction.

As shown in Figure 4, the printed circuit board 17 that electronic components such as zero-sequence current transformer 15 and capacitor 20 are installed is in the state that is parallel to partition wall 26, and utilizes buckle etc. to be detachably fixed on the formed The inner wall of the first storage space 25 .

In addition, the three conductive connecting wires 14 a to 14 c are inserted through the insertion hole 26 a formed in the partition wall 26 , the substrate insertion hole 30 of the printed circuit board 17 , and the cavity portion 15 a of the zero-sequence current transformer 15 . At this time, a part of the three conductive connection wires 14 a to 14 c enters and is guided into the guide recesses 31 a to 31 c of the connection wire guide portion 31 fixed to the printed circuit board 17 .

The three conductive connecting wires 14a-14c extending to one side of the circuit breaker 2 (the left side of FIG. 4 ) come out of the cavity 15a of the zero-sequence current transformer 15 and then bend in the direction of separation from each other, and further to the circuit breaker. The direction in which the circuit breaker 2 is connected is bent.

Then, the end portions of the three conductive connecting wires 14 a to 14 c extending to the circuit breaker 2 side are inserted into the cover member insertion hole 28 a formed in the first cover member 28 . Then, the first cover member 28 is mounted to close the opening of the first storage space 25 of the case main body 22, whereby the ends of the three conductive connecting wires 14a to 14c on the side of the circuit breaker 2 are covered by the case main body 22 and The first cover member 28 is supported.

On the other hand, the three conductive connecting wires 14 a to 14 c extending to the side of the electromagnetic contactor 4 come out from the insertion hole 26 a and then bend toward the second storage space 27 , and further bend in the direction of connecting to the electromagnetic contactor 4 .

Then, the end portions of the three conductive connecting wires 14 a to 14 c extending to the electromagnetic contactor 4 side are inserted into the cover member insertion hole 29 a formed in the second cover member 29 . Then, the second cover member 29 is mounted to close the opening of the second storage space 27 of the housing body 22, whereby the ends of the three conductive connecting wires 14a-14c on the electromagnetic contactor 4 side are covered by the housing body 22 and the housing body 22. The second cover member 29 is supported.

In this way, the connection assembly 3 has the following structure: the printed circuit board 17 fixed with the zero-sequence current transformer 15 is fixed on the inner wall of the housing main body 22, and the cavity part 15a of the zero-sequence current transformer 15 and the substrate of the printed circuit board 17 The three conductive connecting wires 14 a to 14 c passed through the insertion hole 30 are supported by the first cover member 28 and the second cover member 29 detachably fixed to the case main body 22 .

Next, effects of the combined starter 1 according to the first embodiment will be described.

The connecting assembly 3 constituting the integrated starter 1 of the first embodiment has built-in electronic components such as a zero-sequence current transformer 15 and a capacitor 20 for detecting the leakage of the circuit between the power supply and the load in the assembly casing 21, and is installed with a leakage current transformer. Therefore, the printed circuit board 17 of the detection circuit 16 can be provided with an electric leakage detection function, and can also be miniaturized.

In addition, in the integrated starter 1 of the first embodiment, when the current flowing in the conductive connection wires 14a to 14c of the connection assembly 3 becomes unbalanced and an induced voltage is generated in the coil of the zero-sequence current transformer 15, a leakage current is detected. The detection circuit 16 outputs a disconnection control signal to the voltage tripping device 9 of the circuit breaker 2, and the switching contact 6 is disconnected (disconnected), so it can be used not only as a protection and control device for the load (motor), but also as a Leakage circuit breakers.

In addition, since the connection assembly 3 is fixed on the inner wall of the housing main body 22, the printed circuit board 17 fixed with the zero-sequence current transformer 15 is inserted through the cavity part 15a of the zero-sequence current transformer 15 and the substrate of the printed circuit board 17. Since the three conductive connecting wires 14a to 14c passed through the hole 30 are detachably fixed to the first cover member 28 and the second cover member 29 of the case main body 22 and supported by a simple structure, the manufacturing cost can be reduced.

Explanation of reference signs

1 Integrated starter

2 circuit breakers

3 Connection components

4 Magnetic contactor

5 Main circuit of the circuit breaker

6 open and close contacts

7 Opening and closing mechanism

8 Opening and closing handle

9 Voltage trip device

10a～10c Load side terminals of circuit breaker

12 Main circuit of electromagnetic contactor

12a Fixed contact

12b Movable contact

13a～13c Power supply side terminals of electromagnetic contactor

14a～14c Conductive connecting wire

15 Zero-sequence current transformer

15a Cavity

16 Leakage detection circuit

17 printed circuit board

18 power cord

19 power circuit

20 capacitors

21 Component housing

22 Housing body

23 Carrying table

25 The first storage space

26 Partition wall

26a Through hole

27 Second storage space

28 First cover part

28a Cover member insertion hole

29 Second cover part

29a Cover member insertion hole

30 Board insertion hole

31 Cable guide

31a to 31c are guide recesses.

Claims (4)

1. A comprehensive starter, characterized in that: In the circuit between the power supply and the load, the circuit breaker and the electromagnetic contactor are connected in series via the connecting component, A leakage detection unit for detecting a leakage of the electric circuit is incorporated in the connection assembly. 2. The integrated starter according to claim 1, characterized in that: The circuit breaker includes an opening and closing mechanism for opening and closing the opening and closing contacts and a voltage tripping device for opening and closing the opening and closing mechanism, The voltage tripping device controls opening and closing of the switching mechanism by inputting a control signal from the leakage detection unit that detects the leakage of the circuit. 3. The integrated starter according to claim 1 or 2, characterized in that: the connection assembly includes a plurality of conductive connection wires connected to the load-side terminals of the circuit breaker and the power-side terminals of the electromagnetic contactor, The leakage detection part is equipped with a zero-sequence current transformer that uses the plurality of conductive connecting wires as primary conductors to detect the unbalanced current of the circuit and prints an output based on the zero-sequence current transformer. Value detection leakage detection circuit printed circuit board. 4. The integrated starter according to claim 3, characterized in that: The component housing includes: a housing body provided with a storage space; and a first cover member and a second cover detachably fixed to the housing main body so as to close openings opened on the circuit breaker side and the electromagnetic contactor side of the storage space part, The printed circuit board on which the zero-sequence current transformer is fixed is fixed on the inner wall of the housing main body, passing through the cavity of the zero-sequence current transformer and a plurality of conductive connecting wires of the printed circuit board It is supported by the first cover member and the second cover member so as to be inserted through the first cover member and the second cover member.