KR890002160Y1 - Overcurrent relay device of three-phase motor - Google Patents
Overcurrent relay device of three-phase motor Download PDFInfo
- Publication number
- KR890002160Y1 KR890002160Y1 KR2019860008984U KR860008984U KR890002160Y1 KR 890002160 Y1 KR890002160 Y1 KR 890002160Y1 KR 2019860008984 U KR2019860008984 U KR 2019860008984U KR 860008984 U KR860008984 U KR 860008984U KR 890002160 Y1 KR890002160 Y1 KR 890002160Y1
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- South Korea
- Prior art keywords
- output
- comparator
- gate
- transistor
- relay device
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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
- H02H3/08—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 excess current
- H02H3/083—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 excess current for three-phase systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- 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
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/10—Commutator motors, e.g. repulsion motors
- H02P25/107—Polyphase or monophase commutator motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안 장치의 회로도1 is a circuit diagram of the device of the present invention
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 전파정류기 2 : 필터1: full wave rectifier 2: filter
3, 3' : 비교기 4, 4' : 반전기3, 3 ': Comparator 4, 4': Inverter
5 : 앤드(AND)게이트 6 : 지연기5 AND gate 6 Delay
CT1~CT3 : 변류기 VR1 : 가변저항CT1 ~ CT3: Current transformer VR1: Variable resistor
D7, D8, D9, D10 : 다이오드 RY : 계전기D7, D8, D9, D10: Diode RY: Relay
Q1 : 트랜지스터Q1: transistor
본 고안은 3상 전동기의 과부하 상태를 보호하기 위한 수단으로서 과부하 운전기의 과전류를 감지하여 전원을 자동차단시키는 3상 전동기의 과전류 계전기 장치에 관한 것이다.The present invention relates to an overcurrent relay device for a three-phase electric motor which detects an overcurrent of an overload driver and cuts off the power as a means for protecting an overload state of the three-phase electric motor.
종래의 3상 전동기에는 주로 열등형 계전기를 사용하여 왔으나 열등형 계전기의 열등 특성은 110~125%범위 이내에서는 그 동작이 불확실하고 동작이 되어도 장시간 소요되며 특히 오래 사용하면 재질의 특성이 변화하여 제대로 동작하지 않는 결점이 있었다.Conventional three-phase motors have mainly used inferior relays, but the inferior characteristics of inferior relays are in the range of 110 to 125%, and their operation is uncertain and takes a long time even if they are operated. There was a flaw that did not work.
본 고안은 이와 같은 점을 감안하여 변류기의 유기전류와 별도의 기준전압을 비교기로서 비교검출하여 계전기를 동작시킴으로서 동작의 안정을 기하기 위한 것으로 본 고안의 구성과 작용효과를 상세하게 설명하면 다음과 같다.The present invention is designed to stabilize the operation by operating the relay by comparing and detecting the induced current of the current transformer and the separate reference voltage as a comparator in consideration of such a point. The configuration and effect of the present invention will be described in detail as follows. same.
첨부도면 제1도와 같이 3상 전원에 구성된 변류기(CT1~CT3)의 2차측에 전파정류기(1)를 연결하고 그 출력에 구성된 필터(2)의 오차 검출용 가변저항(VR1)의 가동자는 병렬접속되어진 다이오드(D7, D8)와 평활콘덴서(C2, C3)를 통하여 비교기(3) (3')의 반전입력단자(-)에 각각 연결하고 비교기(3)의 출력은 반전기(4)와 다이오드(D9)를 통하여 계전기(RY) 스위칭용 에미터 접지 트랜지스터(Q1)의 베이스에 연결하고 비교기(3')의 출력에 연결된 반전기(4')의 출력은 앤드(AND)게이트(5)의 일측 입력에 연결함과 동시에 지연기(6)를 통하여 앤드(AND)게이트(5)의 다측 입력에 연결하여 그 출력은 다이오드(D10)를 통하여 트랜지스터(Q1)의 베이스에 연결하여된 것이다.As shown in FIG. 1, the full-wave rectifier 1 is connected to the secondary side of the current transformers CT1 to CT3 configured in the three-phase power supply, and the movable resistors of the variable resistance VR1 for error detection of the filter 2 configured at the output thereof are parallel to each other. It is connected to the inverting input terminal (-) of the comparators 3 and 3 'through the connected diodes D7 and D8 and smoothing capacitors C2 and C3, respectively. The output of the inverter 4 'connected to the base of the emitter ground transistor Q1 for switching the relay RY through the diode D9 and connected to the output of the comparator 3' is the AND gate 5. It is connected to the one side of the input and at the same time to the multi-sided input of the AND gate (5) through the retarder 6, the output is connected to the base of the transistor (Q1) through the diode (D10).
미설명 부호(M)은 전동기임.Unexplained symbol (M) is an electric motor.
이와 같은 본 고안 구성의 작용효과를 설명하면, 전동기(M)에 전원을 인가하면 변류기(CT1~CT3)에 유기된 전류는 전파정류기(1)로 정류되고 스칼라 합성되어 필터(2)로 여과되는데 오차 검출용 가변저항에 의해 설정된 전압이 비교기(3)(3')의 반전입력단자(-)에 분할 입력된다.When explaining the effect of the present invention configuration, when the power is applied to the electric motor (M), the current induced in the current transformers (CT1 ~ CT3) is rectified by the full-wave rectifier (1), scalar synthesized and filtered by the filter (2) The voltage set by the error detecting variable resistor is dividedly input to the inverting input terminal (-) of the comparator 3 (3 ').
그러므로 비교기(3)(3')는 가변저항(VR1)으로 설정된 변류기의 2차 전압과 비반전입력단자(+)에 입력되는 기준전압(Vcc)이 각각의 가변저항(VR2, VR3)으로 설정된 전압을 비교하게 된다.Therefore, the comparator 3 (3 ') has the secondary voltage of the current transformer set to the variable resistor VR1 and the reference voltage Vcc input to the non-inverting input terminal (+) is set to the respective variable resistors VR2 and VR3. The voltages will be compared.
여기서 처음 전원 인가시(전동기의 가동시)에는 정격전류의 3~6배가 흐르는데 이를 가변저항(VR1)으로 설정하고 비교기(3)(3')의 비반전입력단자(+)에 입력되는 기준전압(Vcc)은 가변저항(VR3)을 조정하여 이 비교전압을 정격 전류치에 설정한다.Here, when the power is first applied (operation of the motor), 3 to 6 times of the rated current flows, which is set as the variable resistor VR1 and the reference voltage input to the non-inverting input terminal (+) of the comparator 3 (3 '). (Vcc) adjusts the variable resistor (VR3) to set this comparison voltage to the rated current value.
지금 비교기(3')의 반전입력단자(-)에 인가되는 전압이 비반전입력단자(+)의 기준전압보다 작으면 비교기(3')의 출력은 하이가 되나 반대로 반전입력단자(-)의 전압이 높으면 비교기(3')의 출력은 로우가 된다.If the voltage applied to the inverting input terminal (-) of the comparator 3 'is now smaller than the reference voltage of the non-inverting input terminal (+), the output of the comparator 3' becomes high, but the reverse of the inverting input terminal (-) If the voltage is high, the output of the comparator 3 'goes low.
최초 전원 인가시 즉, 가동시에는 비교기(3')의 반전입력단자(-)전압이 비반전입력단자(+) 전압보다 높음으로 비교기(3')의 출력은 로우가 되고 반전기(4')의 출력은 하이가 되는데 앤드(AND)게이트(5)의 일측 입력은 이 하이신호가 그대로 직접 인가되지만 타측 입력에는 지연기(6)에서 소정시간 지연됨으로 로우상태로 입력되어 앤드(AND)게이트(5)의 출력은 로우가 된다.When the power is applied for the first time, that is, during operation, since the inverting input terminal (-) of the comparator 3 'is higher than the non-inverting input terminal (+) voltage, the output of the comparator 3' becomes low and the inverter 4 ' ) Output goes high, and one input of the AND gate 5 is directly applied as it is, but the other input is brought low because the delay time is delayed by the delayer 6 to the other input. The output of (5) goes low.
(VR5)와 (C11)로 지연회로를 구성한 것은 기동전류 동작시한을 설정하기 위한 것이다.The delay circuit constituted by (VR5) and (C11) is for setting the starting current operation time limit.
따라서 트랜지스터(Q1)가 "오프"상태에서 계전기(RY)는 동작하지 않음으로 전원은 차단되지 않는다.Therefore, when the transistor Q1 is in the " off " state, the relay RY does not operate and thus the power is not cut off.
이후에 정상전류가 흐르면 콘덴서(C4)의 충전전압에 의해 앤드(AND) 게이트(5)의 타측에 하이신호가 걸리게 되나 비교기(3')가 하이가 되고 반전기(4')는 로우로 되어 전동기(M)는 계속 동작한다.Subsequently, when a normal current flows, a high signal is applied to the other side of the AND gate 5 by the charging voltage of the capacitor C4, but the comparator 3 'becomes high and the inverter 4' becomes low. Electric motor M continues to operate.
그러나 만일 전동기(M)에 과부하가 걸리거나 단락사고에 의한 과전류가 흐르게되면 변류기(CT1-CT3)에 유기되는 전류도 급격히 상승하여 오차 검출용 가변저항(VR1)의 가동자에는 비교적 높은 전압이 나타난다. 과부하시는 (VR3)로 설정된 정격전류와 비교됨으로 비교기(3')는 출력이 로우가 되고 반전기(4')는 출력이 하이가 된다.However, if the motor M is overloaded or an overcurrent due to a short-circuit accident flows, the current induced in the current transformers CT1-CT3 also rises rapidly, and a relatively high voltage appears at the actuator of the variable resistance VR1 for error detection. . When the overload is compared with the rated current set to (VR3), the comparator 3 'goes low and the inverter 4' goes high.
한편 앤드(AND)게이트(5) 타측 입력은 지연회로(VR5)와 (C11)에 의해 지연시간 후는 하이가 됨으로 앤드(AND)게이트(5) 출력이 하이가 되어 트랜지스터(Q1)이 "온"된다.On the other hand, the other input of the AND gate 5 becomes high after the delay time by the delay circuits VR5 and C11, so that the output of the AND gate 5 becomes high so that the transistor Q1 is turned on. "do.
한편 단락사고시는 비교기(3)의 반전입력단자(-)전압은 비반전입력단자(+)전압보다 높게되어 비교기(3)의 출력은 로우가 되고 반전기(4)의 출력은 하이가 되어 다이오드(D9)를 통해 트랜지스터(Q1)의 베이스에 인가됨으로 트랜지스터(Q1)가 "온"된다. 트랜지스터(Q1)가 "온"되면 계전기(RY)가 여자되어 과전류상태의 전원을 차단하게 된다.On the other hand, in the case of a short circuit, the inverting input terminal (-) voltage of the comparator 3 is higher than the non-inverting input terminal (+) voltage so that the output of the comparator 3 becomes low and the output of the inverter 4 becomes high so that the diode Transistor Q1 is "on" by being applied to the base of transistor Q1 via D9. When the transistor Q1 is "on", the relay RY is excited to cut off the power in the overcurrent state.
가변저항(VR2)는 단락사고시 전류를 기준으로 설정된다.The variable resistor VR2 is set based on the current in the event of a short circuit.
이와 같이 본 고안은 비교기의 기준전압과 과전류에 의한 과대전압을 정확히 비교함으로 전동기 운전시 과전류로부터의 보호기능이 보다 안정된 실용적인 고안이다.As such, the present invention accurately compares the reference voltage of the comparator with the overvoltage caused by the overcurrent, thereby making the protection function from overcurrent during motor operation more stable and practical.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860008984U KR890002160Y1 (en) | 1986-06-25 | 1986-06-25 | Overcurrent relay device of three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019860008984U KR890002160Y1 (en) | 1986-06-25 | 1986-06-25 | Overcurrent relay device of three-phase motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR880001388U KR880001388U (en) | 1988-03-15 |
| KR890002160Y1 true KR890002160Y1 (en) | 1989-04-12 |
Family
ID=19252993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019860008984U Expired KR890002160Y1 (en) | 1986-06-25 | 1986-06-25 | Overcurrent relay device of three-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR890002160Y1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100293336B1 (en) * | 1995-07-04 | 2002-02-19 | Satake Eng Co Ltd | Flour mill |
-
1986
- 1986-06-25 KR KR2019860008984U patent/KR890002160Y1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100293336B1 (en) * | 1995-07-04 | 2002-02-19 | Satake Eng Co Ltd | Flour mill |
Also Published As
| Publication number | Publication date |
|---|---|
| KR880001388U (en) | 1988-03-15 |
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