KR920006536Y1 - Protective circuit for 3-phase dc motor - Google Patents
Protective circuit for 3-phase dc motor Download PDFInfo
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- KR920006536Y1 KR920006536Y1 KR2019900009717U KR900009717U KR920006536Y1 KR 920006536 Y1 KR920006536 Y1 KR 920006536Y1 KR 2019900009717 U KR2019900009717 U KR 2019900009717U KR 900009717 U KR900009717 U KR 900009717U KR 920006536 Y1 KR920006536 Y1 KR 920006536Y1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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- Protection Of Generators And Motors (AREA)
Abstract
내용 없음.No content.
Description
첨부도면은 본 고안의 실시회로도.The accompanying drawings are embodiments of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
RY1∼RY3: 릴레이 접점 Sla, S2a, S3a, S1b, S2b, S3b : 릴레이 접점RY 1 to RY 3 : Relay contact S l a, S 2 a, S 3 a, S 1 b, S 2 b, S 3 b: Relay contact
L1∼L3: 램프 BZ1∼BZ3: 부져L 1 to L 3 : Lamp BZ 1 to BZ 3 : Buzzer
본 고안은 3상 교류 전원을 사용하는 교류 모우터에 있어서, 입력 3상 중 1상이 끊어질 때 모우터로 과전류가 흐르는 것을 방지하기 위한 3상 교류 모우터용 결상 보호회로에 대한 것이다.The present invention is an alternating current motor using a three-phase alternating current power supply, and relates to a phase protection circuit for a three-phase alternating current motor to prevent an overcurrent from flowing to the motor when one of three input phases is disconnected.
종래에는 일반 전기실이나 공장에서 교류모우터를 보호하기 위하여 과부하계전기(overload relay)를 사용하여 왔는데, 이 과부하계전기는 모우터로 연결되는 주회로에 접속되어 과부전화류 발생시 자체발열에 의해 그바이메탈 접점이 동작하여 마그네트 스위치를 차단시키는 열동계전기로 구성되어 있다.Conventionally, an overload relay has been used to protect an AC motor in a general electric room or a factory. The overload relay is connected to a main circuit connected to a motor, and when the overload is generated, its bimetal contact is caused by self-heating. This operation consists of a thermal relay that shuts off the magnet switch.
그러나, 입력 3상 중 1상이 끊어지면 잔여 2상을 통한 전류의 크기는 정상상태의 1.5∼2배가 되는데, 이때에는 과부하계전기가 작동되지 않으므로 마그네트 스위치를 동작시키지 못함으로서 과전류에 의해 모우터 코일이 타버리게 되는 폐단이 있었다.However, if one of the three input phases is broken, the magnitude of the current through the remaining two phases is 1.5 to 2 times the normal state. At this time, the overload relay does not operate, so the magnet switch cannot be operated, resulting in the motor coil being overloaded. There was a burnt out burnt out.
본 고안의 목적은 이와같은 폐단을 해결하기 위하여 입력 3상 중 1상이 끊어지면 바로 마그네트 스위치를 차단시켜 모우터로 공급되는 과전류를 차단시킴과 함께 결상상태를 시각적 및 청각적으로 경보해 주도록 된 3상 교류 모우터용 결상 보호회로를 제공하기 위한 것으로서, 이하 본 고안의 기술적 구성 및 작용효과를 첨부도면에 의해 상세히 설명한다.The purpose of the present invention is to solve the above-mentioned closure, and when one of three input phases is broken, the magnet switch is cut off immediately to cut off the overcurrent supplied to the motor and to provide an alarm of visual and audible phase. As to provide an phase protection motor for the phase alternating current motor, the technical configuration and effect of the present invention will be described in detail by the accompanying drawings.
첨부도면은 본 고안의 실시회로도로서, R상, S상 및 T상의 입력 3상이 마그네트 스위치의 각접점(Mfs)(Mgs) 및 열동계전기(Th)를 통해 각 모우터(Mtl)(MT3)에 연결되고, 연동의 시동스위치(SW4)(SW4')와 병렬접속된 마그네트 스위치의 상시개방 접점(Mfsa)(Mgsa), 연동의 정지스위치(SW2)(SW3') 열동계전기(Th)의 연동 접점(Ths1)(Ths2) 및 마그네트 스위치 코일(Mf)(Mg)에 차례로 병렬 접속된 3상 교류모우터용 보호회로에 있어서, 상기 R상에 제1릴레이코일(Ryl), 램프(Ll) 및 병렬연결된 제3릴레이 상시 접속접점(S3b) 및 부져(BZ1)가 병렬접속되며, 상기 S상에 제2릴레이코일(RY2), 램프(L2) 및 병령 연결된 제1릴레이 상시 접속 접점(S1b) 및 부져(BZ2)가 병렬접속되고, 상기 T상에 제3릴레이코일(Ry3), 램프(L3) 및 병렬 접속된 제2릴레이 상시 접속 접점(S2b)가 병렬 접속되며, 상기 R상과 상기 마그네트 스위치의 상기 개방접검(Mfsa)(Mgsa) 사이에 상기 제1∼제3릴레이의 상시 개방 접점(S1)(S2)(S3)이 직렬연결 되도록 구성된다.The accompanying drawings are an implementation circuit diagram of the present invention, in which R, S, and T inputs have respective motors Mt l (MT) through an angle contact (Mfs) (Mgs) and a thermal relay (Th) of a magnetic switch. 3 ) Normally open contact (Mfsa) (Mgsa) of the magnetic switch connected in parallel with the interlocking start switch (SW 4 ) (SW 4 ') and the interlocking stop switch (SW 2 ) (SW 3 ') In the protection circuit for a three-phase AC motor connected in parallel to the interlocking contacts Ths 1 (Ths 2 ) and the magnet switch coil Mf (Mg) of the copper relay Th, the first relay coil (P) Ry l ), the lamp L l and the third relay always connected in parallel (S 3 b) and the buzzer BZ 1 are connected in parallel, the second relay coil (RY 2 ), lamp (L) on the S 2 ) and the first relay normally connected contact S 1 b and the buzzer BZ 2 connected in parallel, and the third relay coil Ry 3 , the lamp L 3 and the parallel connected parallel to the T phase. 2 relay always-on connection contacts (S 2, b) a parallel It is in the open jeopgeom (Mfsa) normally open in the first to third relay between (Mgsa) Contact point (S 1) (S 2) adapted to be (S 3) the series connection of the R phase and the magnet switch do.
미설명 부호 중 N은 접지선, SW1은 안전차단 스위치, Vcc는 220V용 교류전원, L4, L5는 램프이다.N is the ground wire, SW 1 is the safety cutoff switch, Vcc is the 220V AC power supply, and L 4 and L 5 are the lamps.
이와같이 구성된 본 고안에 있어서, 교류 380V의 R,S,T입력 3상은 각 릴레이 코일(RY1∼RY3)로 인가되어 이들 코일을 여자시키게 되며, 이에 의해 R상에 직렬연결 된 릴레이 상기 개방 접점(Sla)(S2a)(S3a)이 접속상태로 되는 한편 그 상시 접속 접검(Slb)(S2b)(S3b)은 개방 상태로 됨으로서 각 경보용 부져(BZ1∼BZ3)는 구동전원이 차단되어 동작하지 않게 된다. 이때, 각 릴레이 코일(RYl∼RY3)에 각각 병렬접속된 램프(L1∼L3)도 모두 점등되어 현재 3상이 모두 입력되고 있음을 표시해 주게 된다.In the present invention configured as described above, the R, S, T input three phases of AC 380V are applied to each relay coil (RY 1 to RY 3 ) to excite these coils, thereby relaying the relay open contacts connected in series with R phase. (S l a) (S 2 a) (S 3 a) is in the connected state while the regular connection check (S l b) (S 2 b) (S 3 b) is in the open state, so that each buzzer for alarm ( BZ 1 to BZ 3 ) do not operate because the driving power is cut off. At this time, it lights up all the road lamp (L 1 ~L 3) each connected in parallel with each relay coil (RY l ~RY 3) is to give a display that is input to both the current third phase.
이와같은 상태에서 시동스위치(SW4)(SW4')를 눌러주면, 접속 상태의 릴레이 접점(Sla) (S2a) (S3a)을 통한 R상이 이 시동스위치(SW4)(SW4')와 상시 접속상태의 정지 스위치(SW3)(SW3'), 열전계전기 접점(Ths1)(Ths2)를 차례로 통한 후 마그네트 스위치 코일(Mf)(Mg)로 인가되며, 이에 의해 이등 코일이 여자되어 각 마그네트 스위치 접점(Mfs)(Mgs)(Mfsa)(Mgsa)이 모두 접속 상태로 된다.The start-up in the same state switch (SW 4) (SW 4 ' ) the relay contact (S l a) of the connection pressing and (S 2 a) (S 3 a) R different from the starting switch (SW 4) by (SW 4 '), through the stop switch (SW 3 ) (SW 3 ') in the always-connected state, through the thermoelectric contacts (Ths 1 ) (Ths 2 ), and then applied to the magnet switch coil (Mf) (Mg), As a result, the second coil is excited, and each of the magnet switch contacts Mfs, Mgs, Mfsa, and Mgsa is connected.
따라서, R, S, T상을 통한 교류 380V전원이 마그네트 스위치 접점(Mfs) (Mgs)을 통해 각 모우터(MTl) (MT2)로 공급되어 이들 모우터가 구동되는 한편, 마그네트 스위치 접검(Mfsa)(Mgsa)에 의해 마그네트 스위치코일(Mf)(Mg)은 자기보지상태로 되므로 시동 스위치(SW4)(SW4')가 다시 개방상태로 되더라도 마그네트 스위치 코일(Mf)(Mg)은 계속 여자된 상태를 유지하게 된다.Therefore, AC 380V power supply through R, S, and T phases is supplied to each motor MT l (MT 2 ) through the magnet switch contact Mfs (Mgs) to drive these motors, while magnet switch inspection is performed. The magnet switch coil Mf (Mg) becomes self-holding by (Mfsa) (Mgsa), so the magnet switch coil (Mf) (Mg) does not change even when the start switch (SW 4 ) (SW 4 ') is opened again. Will remain excited.
한편, 램프(L5)(L5)는 마그네트 스위치 코일(Mf)(Mg)이 여자된 상태임을 표시해 주기위한 것이다.On the other hand, the lamp (L 5 ) (L 5 ) is to indicate that the magnet switch coil (Mf) (Mg) is in an excited state.
이와같은 상태에서 입력 R,S,T상 중 예를 들어 R상이 끊어지게 되면, 이에 연결된 제1릴레이 코일(RY1)이 동작정지되어 그 릴레이 접점(Sla)이 개방되고 릴레이 접점(Slb)은 접속 상태로 되므로, 이에 의해 제2릴레이 코일(RY2)과 병렬 접속된 부져(BZ2)가 구동되어 결상에 따른 경보음을 발하게 되는데, 이때, 제1릴레이코일(RYl)과 병렬 접속된 램프(L1)도 구동 전원공급이 안되므로 소등상태로 됨으로서 사용자가 R상이 결상되었음을 확인할 수 있게 된다.In such a state, if the R phase of the input R, S, T phase, for example, the R phase is broken, the first relay coil RY 1 connected thereto is stopped and the relay contact S l a is opened and the relay contact S Since b b is in a connected state, the buzzer BZ 2 connected in parallel with the second relay coil RY 2 is driven to emit an alarm sound due to an open phase. In this case, the first relay coil RY l is driven. Since the lamp (L 1 ) connected in parallel with the driving power supply is not turned off, the user can confirm that the R phase is missing.
또한, 각 릴레이 접점(S1a) (S2a) (S3a)을 통해 마그네트 스위치 코일(Mf) (Mg)로 공급되던 N상이 차단됨으로서 이 마그네트 스위치 코일(Mf)(Mg)이 동작 정지 되고, 이에 의해 각 마그네트 스위치 접점(Mfs) (Mgs) (Mfsa) (Mgsa) 이 모두 개방상태로 된다. 따라서 각 모우터(MTl) (MT2)로 공급되던 380V 3상교류 전원이 차단되어 이들 모우터를 정지시키게 됨으로서 1상 결상시 과전류에 의한 모우터의 손상을 방지할수 있게 된다.In addition, this magnet switch coil Mf (Mg) operates by cutting off the N-phase supplied to the magnet switch coil Mf (Mg) through each relay contact (S 1 a) (S 2 a) (S 3 a). The magnet switch contacts Mfs (Mgs) (Mfsa) (Mgsa) are all opened by this. Therefore, the 380V three-phase AC power supplied to each motor MT l (MT 2 ) is cut off to stop these motors, thereby preventing damage to the motor due to overcurrent during one-phase phase loss.
한편, S상 또는 T상이 각각 끊어졌을 경우에도 전술한 바와 같은 회로 동작에 의해 릴레이코일(RY2) 또는 릴레이코일(RY3)이 동작 정지되는데, 이에 의해 부져(BZ3) 또는 부져(BZ1)가 구동되고, 램프(L2) 또는 램프(L3)가 소등됨으로서 S상 또는 T상의 결상을 표시해 주게된다. 또한 이와 동시에 릴레이 접점(S2a) 또는 릴레이 접점(S3a)이 개방상태로 되어 마그네트 스위치 코일(Mf)(Mg)이 동작 정지되며, 이에 의해 마그네트스위치 접검(Mfs)(Mgs) 역시 개방 상태로 되므로 모우터(MT1)(MT2)가 정지되어 모우터의 손상을 방지하게된다.On the other hand, even when the S phase or the T phase is broken, respectively, the relay coil RY 2 or the relay coil RY 3 is stopped by the circuit operation as described above, whereby the buzzer BZ 3 or the buzzer BZ 1 . Is driven and the lamp L 2 or lamp L 3 is turned off to display the S phase or the T phase image. At the same time, the relay contact S 2 a or the relay contact S 3 a is in an open state, and the magnet switch coil Mf (Mg) is stopped. As a result, the magnet switch check (Mfs) (Mgs) is also opened. Since the motor MT 1 (MT 2 ) is stopped to prevent damage to the motor.
이상과 같이 본 고안은 3상 교류 모우터로 입력되는 3상 중 1상이 끊어지게 되면 모우터를 정지시킴과 함께 결상상태를 시각적 및 청각적으로 경보해 주게되며, 또한 그회로구성상 모우터의 전력 용량이나 사용 댓수에 무관하게 설치 사용이 가능한 장점을 갖는다.As described above, the present invention stops the motor when one phase of the three phases input to the three-phase AC motor is interrupted, and visually and acoustically alarms the open phase, and the circuit configuration of the motor It can be installed and used regardless of the power capacity or the number of uses.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900009717U KR920006536Y1 (en) | 1990-07-03 | 1990-07-03 | Protective circuit for 3-phase dc motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019900009717U KR920006536Y1 (en) | 1990-07-03 | 1990-07-03 | Protective circuit for 3-phase dc motor |
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| Publication Number | Publication Date |
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| KR920003482U KR920003482U (en) | 1992-02-25 |
| KR920006536Y1 true KR920006536Y1 (en) | 1992-09-19 |
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