JP6688148B2 - Disconnector unit, load disconnector, and control center - Google Patents

Description

  Embodiments of the present invention relate to a disconnector unit, a load disconnector, and a control center.

  A zero-phase current transformer is used when measuring a ground fault current in a unit device arranged in a control center. A large number of unit devices are arranged in the control center, and a disconnecting device capable of electrically connecting / disconnecting each unit device and the control center is provided.

JP, 10-210612, A

  However, it takes time and effort to pass the electric wire through the zero-phase current transformer, which deteriorates manufacturability and maintainability of the control center. It is therefore an object of the present invention to provide a disconnecting switch unit, a load disconnecting switch, and a control center that can improve manufacturability and maintainability.

The disconnector unit according to the embodiment constitutes a disconnector for electrically connecting and disconnecting a unit device arranged in a control center and the control centers, and is integrally provided with a zero-phase current transformer. The zero-phase current transformer includes a first zero-phase current transformer and a second zero-phase current transformer, and the control center has three-phase electric wires of R phase, S phase, and T phase. There are provided a total of six conductive parts for each phase, and two conductive parts connected to two R-phases and one S-phase are passed through the first zero-phase current transformer. The second zero-phase current transformer has a conductive portion connected to two T-phases and the other one S-phase .

Front view showing a schematic configuration example of a control center according to the first embodiment The perspective view which expands and shows the schematic structure of the unit device incorporated in a control center. The figure which shows the electric constitution of a unit device typically. Perspective perspective view schematically showing the configuration of the disconnector unit The figure which showed typically the vertical cross-section arrow line in the AA line of FIG. A perspective view showing a schematic configuration of a disconnector unit according to a second embodiment. The figure which shows typically the longitudinal cross-section arrow line view in the BB line of FIG. A perspective view showing a schematic configuration of a disconnector unit according to a third embodiment. The figure which shows typically the longitudinal cross-section arrow line view in CC line of FIG.

  Hereinafter, a plurality of embodiments will be described with reference to the drawings. In the description of the embodiments, substantially the same components are designated by the same reference numerals and the description thereof will be omitted.

(First embodiment)
FIG. 1 is a front view showing a schematic configuration example of a control center 100 according to the first embodiment. FIG. 2 is an enlarged perspective view showing a schematic configuration of the unit device 19 incorporated in the control center 100. FIG. 3 is a diagram schematically showing an electrical configuration of the unit device 19.
The control center 100 includes a box 11. Inside the box body 11, a plurality of unit chambers 12 partitioned by partition plates 11 a are provided. A unit device 19 described later is mounted in this unit chamber 12. A door 13 is rotatably attached to the entire opening of each unit chamber 12 of the box body 11, and the front opening of each unit chamber 12 is configured to be opened and closed by rotating the door 13.

  Three-phase power busbars 14 (see FIG. 3) corresponding to the R-phase, S-phase, and T-phase are arranged in the rear portion of the box body 11. The front surface of these power-busbars 14 is provided by a busbar cover (not shown). Is covered. A unit power supply disconnecting switch (not shown) is arranged at the rear of each unit chamber 12. Each of these unit power supply disconnectors has an insulating case and three contact portions (not shown) mounted on the insulating case, and each contact portion is connected to the power source bus 14.

  A vertically long wiring processing chamber 15 is defined on the right side of the box body 11. Inside the wiring processing chamber 15, a female disconnecting switch unit 16 is arranged corresponding to each unit chamber 12. ing. Each disconnector unit 16 includes three female side contact portions (not shown). This female-side contact portion corresponds to the load-side contact portion. Each contact portion of the disconnector unit 16 is connected to an induction motor 18 (see FIG. 3) via a load cable 17 (see FIG. 3). The induction motor 18 corresponds to a load.

  A unit device 19 is housed in each unit chamber 12 so that it can be inserted and removed. As shown in FIG. 2, the unit device 19 is configured by fixing main circuit devices such as a circuit breaker 21 and an electromagnetic contactor 22 to a frame 20. A male disconnector unit 38 is provided on the right side surface of the unit device 19. The disconnector unit 38 includes a male contact portion 38a. With the unit device 19 mounted in the unit chamber 12, the male disconnector unit 38 is arranged at a position corresponding to the disconnector unit 16. When the unit device 19 is mounted in the unit chamber 12, the male contact portion 38a of the disconnector unit 38 is fitted into the female contact portion of the disconnector unit 16 as the unit device 19 is inserted. It has a configuration to be electrically connected. When the unit device 19 is removed, the male-side contact portion 38a of the disconnector unit 38 is removed from the female-side contact portion of the disconnector unit 16 along with the removal operation of the unit device 19 so that it is electrically connected. It has a configuration to be cut. That is, the disconnector units 16 and 38 configure a load disconnector 44 (see FIG. 3) that electrically connects and disconnects the unit device 19 and the control center 100.

  As shown in FIG. 3, a main circuit 23 is formed between the power bus 14 and the induction motor 18 (that is, the load). The main circuit 23 includes, for example, a wiring breaker 21, an electromagnetic contactor 22, a current converter 24 that generates a voltage signal according to the main circuit current, a load disconnector 44, and the like. The load disconnector 44 is composed of the female disconnector unit 16 and the male disconnector unit 38. The zero-phase current transformer 25 for detecting the ground fault current is provided in the male disconnector unit 38. The zero-phase current transformer 25 is electrically connected to the control unit 28. The configuration of the disconnector unit 38 including the zero-phase current transformer 25 will be described later. The control unit 28 is configured by a logical operation circuit configured by a microcomputer, and performs various controls on the main circuit 23. The control unit 28 also functions as a ground fault relay that detects a ground fault.

  A unit power disconnector (not shown) is attached to each unit device 19 at the rear of the frame 20. Each of these unit power supply disconnecting switches has an insulating case (not shown) and three contact portions (not shown) fixed to the insulating case. When each unit device 19 is housed in the unit chamber 12, Each contact part of the fixed unit power supply disconnector contacts the contact part of the unit power supply disconnector arranged in the unit chamber 12. The power bus 14 and the circuit breaker 21 for wiring are connected via a power disconnector 37. As a result, the power bus 14 is connected to the main circuit 23, and power is supplied from the power bus 14 to the main circuit 23.

  As shown in FIG. 2, a male disconnector unit 38 is attached to each unit device 19 at the right side of the frame 20. 4 is a perspective view schematically showing the configuration of the disconnector unit 38, and FIG. 5 is a view schematically showing a vertical cross-sectional view taken along the line AA of FIG. The disconnector unit 38 is provided with three male side contact portions 38a corresponding to the R phase, the S phase, and the T phase. The right end of the male contact portion 38a is exposed to the outside of the disconnector unit 38, and is fitted to the female contact portion of the disconnector unit 16 so that it can be electrically connected / disconnected. The male-side contact portion 38a is connected to the main circuit 23 via a conductive portion 38b provided inside the male-side disconnector unit 38. A terminal mounting portion 38c is provided on the left side of the conductive portion 38b and is connected to the three-phase power source bus 14. A male contact portion 38a is provided on the right side of the conductive portion 38b. As described above, the female disconnecting switch unit 16 and the male disconnecting switch unit 38 form the load disconnecting switch 44.

  The three conductive parts 38b provided inside the disconnector unit 38 correspond to the R phase, the S phase, and the T phase, respectively, and are connected to the male contact part 38a. The zero-phase current transformer 25 includes an annular iron core 25a and a winding wire 25c that constitutes a coil 25b that winds the iron core 25a, and has a donut shape with a hole in the center as a whole. The winding 25c forming the coil 25b is connected to the control unit 28. From the zero-phase current transformer 25 to the controller 28, the wire k on the winding input side and the wire l on the winding output side of the coil 25b are connected as seen from the current direction. A storage unit (not shown) of the control unit 28 stores a control program for executing the control operation of the ground fault protection operation and functional data, and the control unit 28 controls the control program, the functional data, and the input signal. Is configured to perform the protection operation and the control operation based on. Thereby, the control unit 28 functions as a ground fault relay.

  The three conductive parts 38 b are arranged so as to pass through a hole provided at the center of the zero-phase current transformer 25. That is, the zero-phase current transformer 25 is provided around the three conductive portions 38b so as to surround them in a non-contact manner. As described above, the disconnector unit 38 integrally includes the zero-phase current transformer 25 inside.

  As described above, according to the disconnector unit 38 according to the first embodiment, the male disconnector unit 38 forming the load disconnector 44 of the unit device 19 arranged in the control center 100 has the internal structure. In addition, the zero-phase current transformer 25 is integrally provided. According to this configuration, by simply connecting the electric wire connected to the three-phase power bus 14 to the terminal mounting portion 38c of the disconnector unit 38, the wiring is easily installed through the zero-phase current transformer 25. Can be realized. Therefore, the complicated work of penetrating the wiring into the zero-phase current transformer 25 is not required at any place of the electric wire connected to the three-phase power bus 14, and the manufacturability of the control center 100 and the unit device 19 is eliminated. Is improved. In addition, it is necessary to select an appropriate size of the zero-phase current transformer according to the size of the electric wire, but according to this configuration, it is not necessary to properly use the zero-phase current transformer 25 depending on the size of the electric wire. It is not necessary to prepare a zero-phase current transformer having the same size as, but a single zero-phase current transformer may be prepared. Therefore, the manufacturing costs of the control center 100 and the unit device 19 can be reduced. In addition, when the zero-phase current transformer 25 is replaced after the control center 100 is installed, the wiring inside the unit device 19 and the terminal mounting portion 38c of the disconnector unit 38 can be separated, which makes the wiring complicated and troublesome. Since the troublesome work is unnecessary, the maintainability of the control center 100 and the unit device 19 is improved.

(Second embodiment)
Next, a second embodiment will be described. FIG. 6 is a perspective view showing a schematic configuration of the disconnector unit 38 according to the second embodiment, and FIG. 7 is a view schematically showing a vertical cross-sectional view taken along the line BB of FIG.

  The six conductive parts 38b provided inside the disconnector unit 38 are connected to the R phase, R phase, S phase, S phase, T phase, and T phase from the top. In this case, although not shown, the female-side disconnector unit 16 also has six female-side contact portions and is configured to correspond to the conductive portion 38b of the disconnector unit 38. The winding 25c forming the coil 25b of the zero-phase current transformer 25 is connected to the control unit 28. The six conductive portions 38b are arranged so as to pass through the holes provided at the center of the zero-phase current transformer 25. That is, the zero-phase current transformer 25 is provided around the six conductive parts 38b so as to surround them in a non-contact manner. As described above, the disconnector unit 38 integrally includes the zero-phase current transformer 25 inside.

  The disconnector unit 38 according to the second embodiment has the same effect as the disconnector unit 38 according to the first embodiment. Further, when the capacity of the unit device 19 is large, a plurality of load disconnecting switches 44 may be provided. In this case, according to the second embodiment, six conductive parts 38b are provided inside and a large load disconnecting switch 44 is provided. It is possible to use the load disconnector 44 using the disconnector unit 38 that can cope with the capacity. According to this, it is possible to increase the current-carrying capacity without increasing the number of the disconnecting switch units 38 (load disconnecting switches 44), which enables cost reduction and space saving of the control center 100.

(Third Embodiment)
Next, a third embodiment will be described. FIG. 8 is a perspective view showing a schematic configuration of the disconnector unit 38 according to the second embodiment, and FIG. 9 is a diagram schematically showing a vertical cross-sectional view taken along the line CC of FIG.

  The disconnector unit 38 according to the third embodiment has a configuration in which the disconnector unit 38 according to the first embodiment is vertically stacked. Hereinafter, the upper part of the disconnector unit 38 will be referred to as the disconnector unit 38s, and the lower part will be referred to as the disconnector unit 38t.

  The disconnector unit 38s is provided with the upper zero-phase current transformer 25s. The disconnector unit 38t is provided with a lower zero-phase current transformer 25t. The six conductive parts 38b provided inside the disconnector unit 38 are connected to the R phase, R phase, S phase, S phase, T phase, and T phase from the top. Further, the zero-phase current transformer 25s of the disconnector unit 38s is provided so as to pass the three conductive portions 38b from above, and each of them corresponds to the R phase, the R phase, and the S phase. The zero-phase current transformer 25t of the disconnector unit 38t is provided so as to pass the lower three conductive parts 38b, and each of them corresponds to the S phase, the T phase, and the T phase. From the zero-phase current transformers 25s and 25t, the wire k on the winding input side to the coil 25b and the wire l on the winding exit side are combined and connected to the control unit 28 when viewed from the current direction. These are integrated together to form the disconnector unit 38.

According to the disconnector unit 38 according to the third embodiment, the same effects as those of the first and second embodiments are obtained.
Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are also included in the invention described in the claims and the scope equivalent thereto.

  In each of the above embodiments, when the control center 100 does not include the control unit 28, a ground fault relay may be separately provided and the zero-phase current transformer 25 may be connected thereto.

  100: control center, 16, 38, 38s, 38t: disconnector unit, 16a: contact part, 19: unit device, 25, 25s, 25t: zero-phase current transformer, 25a: iron core, 25b: coil, 25c: winding Wire, 28: control part (ground fault relay), 38a: contact part, 38b: conductive part, 38c: terminal mounting part

Claims (4)

A disconnecting device for electrically connecting and disconnecting the unit device arranged in the control center and the control center,
ZCT is found integrally includes,
The zero-phase current transformer comprises a first zero-phase current transformer and a second zero-phase current transformer,
The control center is provided with a total of six conductive parts, two for each phase, which are connected to the three-phase electric wires of R phase, S phase, and T phase.
The first zero-phase current transformer has a conductive part connected to two R-phases and one S-phase, and the second zero-phase current transformer has two T-phases and two T-phases. A disconnector unit in which a conductive portion connected to the other one S phase is passed . The first and second zero-phase current transformers are connected by a ground fault relay,
The first and second zero-phase current transformers are configured by an iron core that surrounds the conductive portion in a non-contact manner and a winding that winds the iron core,
The disconnector unit according to claim 1 , wherein the wiring on the input side and the wiring on the output side of the winding of each of the first and second zero-phase current transformers are combined and connected to the ground fault relay.   A load disconnector configured to include the disconnector unit according to claim 1.   A control center comprising the disconnector unit according to claim 1.

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