KR900006947B1 - Devices driding alternating current in order - Google Patents

Devices driding alternating current in order Download PDF

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KR900006947B1
KR900006947B1 KR1019870006163A KR870006163A KR900006947B1 KR 900006947 B1 KR900006947 B1 KR 900006947B1 KR 1019870006163 A KR1019870006163 A KR 1019870006163A KR 870006163 A KR870006163 A KR 870006163A KR 900006947 B1 KR900006947 B1 KR 900006947B1
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load
power
switch
ssr
transformer
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KR1019870006163A
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Korean (ko)
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KR890000955A (en
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김정수
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삼성전자 주식회사
강진구
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

A number of sub circuit breakers are connected to a main circuit breaker through solid state relays (SSR1-n). After power failure, the power is reentered in sequence by turning on the relays. The load current is detected by current transformers (CT1-n) such that the next relay turns on after formed load becomes stable. Then all loads are not applied to the load transformer simultaneously when reentering the power after power failure.

Description

순차제어형 교류전원 분배장치Sequentially Controlled AC Power Distribution Device

제1도는 종래의 교류전원 분배장치1 is a conventional AC power distribution device

제2도는 본 발명의 실시예를 나타내는 순차제어형 교류전원 분배장치2 is a sequential control type AC power distribution device showing an embodiment of the present invention.

제3도는 본 발명에 사용되는 전원 인가를 위한 제어회로도3 is a control circuit diagram for applying power used in the present invention

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

SSR1-SSRn: 무접점 릴레이 CT1-CTn: 변류기SSR 1 -SSR n: Solid state relay CT 1 -CT n: current transformers

A1-An: 앤드게이트 R1-R3: 전압검출용저항A 1 -A n : AND gate R 1 -R 3 : Resistance for voltage detection

본 발명은 순차 제어형 교류전원 분배장치에 관한 것으로써, 특히 변전시설을 갖추고 있는 대단위 아파트, 빌딩, 점포, 공장등의 전력계등에 있어서 안정적으로 급전할 수 있는 전력공급장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sequentially controlled AC power distribution device, and more particularly, to a power supply device that can stably feed power meters, such as large-scale apartments, buildings, stores, factories, and the like having substation facilities.

종래의 교류전원 분배장치는 제1도에서와 같이 변압기의 출력단에 회로보호용 퓨즈를 연결하고, 이어서 주 자동차단기를 연결하며, 상기한 주 자동차단기의 출력단으로 부터 여러개의 부하들을 구역별로 나누어서 병렬로 연결하여 각각의 부하에 부 자동차단기를 연결시켜 구성시킨 것이었다.In the conventional AC power distribution device, as shown in FIG. 1, a circuit protection fuse is connected to an output terminal of a transformer, and then a main motor circuit breaker is connected, and a plurality of loads are divided in parallel from the output terminal of the main motor circuit breaker. By connecting the secondary breaker to each load was configured.

이러한 종래의 교류전원 분배장치에 있어서는 정전후 전원 재투입시 일시에 전부하가 동작하고, 특히 유도 전동기를 부하로 많이 사용하는 곳에서는 과도한 기동전류가 일시에 선로에 흐르기 때문에 변압기 용량이 초과하는 경우가 많아 자동차단기가 차단되거나 퓨즈가 용단되는 등 전력공급을 안정적으로 하지 못하는 문제점이 자주 발생되었으며, 경우에 따라서는 자동 차단기나 퓨즈의 보호동작이 적절하지 못해 변압기가 소손되어 중대한 사고가 발생하기도 하였다. 따라서 변전실에 사람이 상주하여 정전시에 모든 자동차단기를 오프시킨 후 전원이 재투입 되면 사람이 각 부하 구역별로 순차적으로 부 자동차단기를 온시켜 주는 방법을 채택하고 있으나 불시에 순간 정전이 되는 경우에는 이러한 방법도 적절한 해결책이 되지 못하였으며, 이러한 문제점을 어느정도 보상하기 위하여 모든 부하용량보다 휠씬 여유있는 변압기 용량을 선정하여 부하율이 낮게 사용하는 방법도 흔히 체택되고 있으나 이것도 과도한 전력계통 설비비용의 증가 및 변압기 손실 증가로 인한 불필요한 전력소모 등 새로운 문제점을 발생시켰다.In such a conventional AC power distribution device, full load operates at the time of power supply again after a power failure, and especially when the capacity of the transformer is exceeded because excessive starting current flows to the line at a time when the induction motor is used as a load. There were many problems that could not stabilize the power supply, such as the breaker of the car or the blown fuse. In some cases, the transformer was burned due to the improper protection of the automatic breaker or fuse. . Therefore, if a person stays in the substation room and turns off all the breakers in the event of a power failure, and then the power is turned on again, a person adopts a method of turning on the secondary breakers in sequence for each load zone. This method was not a proper solution. To compensate for this problem, a method of selecting a transformer capacity that is much more comfortable than all the load capacities and using a lower load ratio is often adopted, but this also causes excessive power system cost increase and transformer. It caused new problems such as unnecessary power consumption due to increased losses.

본 발명은 상기한 바와 같은 종래기술의 문제점을 해결하기 위하여 안출된 것으로써, 정전후 전원 재투입시에 일시적인 과전류에 의한 자동차단기의 차단작용 또는 퓨즈의 용단에서 오는 재정전사고를 방지할 수 있고, 자동차단기 및 퓨즈의 부정확한 동으로 인한 변압기의 소손을 방지하며, 정전후 전원 재 투입시에 사람이 수동으로 일일이 자동차단기를 온오프 해야하는 불편함을 제거할 수 있는 순차제어형 교류전원 분배장치를 제공하는 것을 그 목적으로 한다.The present invention has been made in order to solve the problems of the prior art as described above, it is possible to prevent the financial accident that comes from the interruption of the automotive circuit breaker or the blown fuse of the fuse due to a temporary overcurrent at the time of re-power-on after power failure In order to prevent the burnout of transformer due to inaccurate copper short circuit and fuse, and to eliminate the inconvenience of having to manually turn on / off the circuit breaker manually when the power is turned on again after a power failure, Its purpose is to provide.

상기한 목적을 달성하기 위하여 본 발명에서는, 항상 변압기 출력측 전압을 검지함으로써 정전여부를 판단하고, 정전시에는 모든 부하에 직렬로 연결된 무접점 릴레이(Solid State Relay)가 오프되도록 하며, 전원 재투입시에는 미리 정해진 순서대로 무접점릴레이를 온하여 각부하에 전원을 인가하되 그때의 부하전류를 변류기(Current Transformer)를 통하여 검출하여 각 부하의 전류가 일정범위내에서 안정을 이룰때 다음 부하에 연결된 무접점릴레이를 온하도록 순차적으로 제어하여 정전후 전원 재 투입시 일시에 모든 부하가 변압기에 인가되는 것을 방지함과 동시에 자동 차단기의 차단작용 또는 퓨즈의 용단으로 인한 재정전 사고의 발생을 방지하도록 하며, 부하를 여러 블럭으로 구분함으로써 변압기용량이 총부하 용량에 근접하도록 용량을 줄일 수 있도록 하는 순차 제어형 교류전원 분배장치를 제공한다.In order to achieve the above object, in the present invention, it is always determined whether the power failure by detecting the voltage of the transformer output side, in the case of power failure, so that a solid state relay connected in series to all the load is turned off, when the power supply is turned on again In this order, the contactless relay is turned on in order to apply power to each load, and the load current is detected through the current transformer, and when the current of each load is stable within a certain range, it is connected to the next load. By sequentially controlling the relay to be turned on, it prevents all loads from being applied to the transformer at the time of power-on again after a power failure, and prevents the occurrence of a power failure due to the interruption of the automatic circuit breaker or the blown fuse. By dividing into multiple blocks, the capacity can be reduced so that the transformer capacity approaches the total load capacity. It provides a sequential control type AC power distribution unit to the lock.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제2도는 본 발명의 바람직한 실시예를 보인 순차제어형 교류전원 분배장치의 변압기 부하간의 구성도로서 종래의 교류전원 분배장치의 변압기 출력단 양단에 전압검출용 저항(R1-R3)을 직렬로 연결하고, 저항(R2)의 양단으로 부터 정전여부를 판단할 수 있는 전압감지부를 두며, 주 자동차단기로 부터는 구분이 필요한 수만큼의 부하를 병렬로 접속하여 각각의 부하 선로에는 선로 1선에 무접점릴레이(SSR1-SSRn)의 출력단을 직렬로 연결하고 부 자동차단기를 거쳐 부하에 연결되는 선로 1선에 부하전류검출용 변류기(CT1-CTn)를 설치한다.2 is a block diagram of the transformer load of the sequential control AC power distribution device showing a preferred embodiment of the present invention in series connected to the voltage detection resistor (R 1- R 3 ) in both ends of the transformer output terminal of the conventional AC power distribution device. It has a voltage sensing unit that can determine whether power failure is applied from both ends of resistor (R 2 ), and the number of loads that need to be distinguished from the main motor breaker are connected in parallel so that each load line has no line 1 line. Connect output terminal of contact relay (SSR 1 -SSR n ) in series and install current transformer (CT 1 -CT n ) for load current detection on one line connected to load via sub-automatic breaker.

한편 무접점릴레이(SSR1-SSRn)의 입력단에는 논리제어용 스위치(SW1-SWn)가 직류전원으로 부터 연결되어 있다.On the other hand, the logic control switch (SW 1 -SW n ) is connected to the input terminal of the solid state relay (SSR 1 -SSR n ) from the DC power supply.

상기한 논리제어용 스위치에 연결된 무접점 릴레이는 통상적으로 사용하는 것으르, 발광 다이오드에 의해 동작되는 포트 트랜지스터의 양단에 영점 검출기가 연결되어 변압기로 부터 인가되는 교류전원이 포트 트라이악을 통해 부하 1에 인가되도록 포토 트라이악을 제어한다.The contactless relay connected to the switch for logic control is commonly used, and a zero detector is connected to both ends of a port transistor operated by a light emitting diode so that AC power applied from the transformer is applied to the load 1 through the port triac. Control the photo triac to be applied.

즉, 앤드게이트(A1)의 하이레벨에 의해 스위치(SW1)가 온되므로 발광다이오드가 온되어 포토 트랜지스터가 구동된다. 포토 트랜지스터의 구동으로 영점검출기에서는 변압기로 부터 인가되는 교류전원의 영점 전위부터 포트 트라이악이 구동되도록 제어하여 초기에 부하 1에 과도한 전류가 흐르는 것을 방지한다.That is, since the switch SW 1 is turned on by the high level of the AND gate A 1 , the light emitting diode is turned on to drive the photo transistor. By driving the photo transistor, the zero detector controls the port triac to be driven from the zero potential of the AC power applied from the transformer, thereby preventing excessive current from flowing in the load 1 initially.

부하 1에 전원이 인가된 후 부하 1에 흐르는 전류가 초기 과도기를 지나 안정화되면 변류기(CT1)의 출력단(C1, D1)을 입력으로 하는 전류 감지희로 1의 출력 b1이 하이레벨을 출력하여 앤드게이트(A2)에 인가되어 앤드게이트(A2)의 입력단에 하이레벨이 인가된 상태이므로 앤드게이트(A2)의 출력은 하이레벨이 된다.After power is applied to the load 1, when the current flowing in the load 1 is stabilized past the initial transient, the output b 1 of the output 1 of the current 1 is high level as the current sensing input to the output terminals C 1 , D 1 of the current transformer CT 1 . The output of the AND gate A 2 becomes a high level because the output signal is applied to the AND gate A 2 and a high level is applied to the input terminal of the AND gate A 2 .

앤드게이트(A2)의 하이레벨 출력이 무접점 릴레이(SSR2)의 입력단에 연결된 스위치(SW2)가 온되어 부하 2에 전원을 투입하게 된다.The high level output of the AND gate A 2 is connected to the input terminal of the solid state relay SSR 2 so that the switch SW 2 is turned on to supply power to the load 2.

상기한 부하 1의 방법과 동일하게 부하 2에 안정된 전류가 흐르면 부하 3에 전원을 인가하게 된다. 이와 같은 방법으로 부하 1에서 부하 N까지 순차적으로 전원을 인가한다.As in the method of load 1 described above, when stable current flows in load 2, power is applied to load 3. In this way, power is sequentially applied from load 1 to load N.

제3도는 본 발명의 순차적인 전원인가를 위한 제어회로로서, 제2도에 도시한 변압기 출력단 양단에 직렬연결된 저항(R1-R3)중 저항(R2)의 양단(A.B)를 입력으로 정전여부를 판단하는 정전 검출회로와, 각 부하선로 1선에 설치된 변류기(CT1-CTn)의 출력단(C1.D1∼Cn-1,Dn-1)을 입력으로 각 부하전류가 일정범위내에서 안정된 상태에 이르면 하이레벨을 출력하도록 구성된 전류 감지회로와, 상기한 정전검출회로와 전류감지회로들의 출력을 조합하여 순차적으로 전원을 인가하도록 하는 앤드게이트(A1-An)로 구성된다.FIG. 3 is a control circuit for sequential power application of the present invention, and inputs both ends AB of the resistors R 2 of the resistors R 1 -R 3 connected in series at both ends of the transformer output terminal shown in FIG. Each load current is inputted by a power failure detection circuit that determines whether there is a power failure, and an output terminal C 1 .D 1 to C n -1, D n -1 of the current transformers CT 1 -CT n installed on each load line. Reaches a stable state within a predetermined range, the AND gate A 1 -A n for sequentially applying power by combining the current sensing circuit configured to output a high level with the outputs of the above-described blackout detection circuit and the current sensing circuits. It consists of.

상기한 구성을 갖는 본 발명의 동작을 설명하면 다음과 같다.Referring to the operation of the present invention having the above configuration is as follows.

우선 전원이 M사이클 동안 정전되었다면 이 M사이클동안 저항(R2)의 양단, 즉 A와 B사이에는 전압이 걸리지 않게 되고, 정전검출회로는 이를 정전으로 판단하여 출력 a를 로우레벨로 한다. 따라서 모든 앤드게이트(A1-An)의 출력은 로우레벨이 되어 각부하에 직렬로 연결된 두접접스위치(SSR1-SSRn)의 입력단의 논리 제어용 스위치(SW1-SWn)를 오프시키게 되므로 부하는 전원으로 부터 차단된다.First, if the power supply is interrupted for M cycles, no voltage is applied between the resistors R 2 , that is, between A and B, during the M cycles, and the power failure detection circuit determines that the power failure is a low level. Accordingly thereby all of the output of the AND gate (A 1 -A n) are off-the logic control switch (SW 1 -SW n) is the input terminal of a low level two jeopjeop switch (SSR 1 -SSR n) connected in series with each load Therefore, the load is disconnected from the power supply.

정전되었던 전원이 다시 인가되면 정전검출회로의 출력 a가 하이레벨이 된다. 따라서 앤드게이트(A1)의 출력도 하이레벨이 되어 무접점릴레이(SSR1)의 입력단의 스위치(SW1)를 온시켜 부하 1에 전원을 투입하게되며 이때 앤드게이트(A2-An)는 로우레벨이 출력되어 부하 2-부하 N에는 전원이 차단된 상태로 있게 된다.When the power supply which has been out of power is applied again, the output a of the outage detection circuit becomes high level. Therefore, the AND gate (A 1) the output is also at a high level solid state relay switch (SW 1) and turns on the supply power to the load 1, wherein the AND gate (A 2 -A n) at the input terminal of the (SSR 1) of The low level is output and the power is disconnected from the load 2-load N.

따라서 제2도와 제3도로서 구성되는 본 발명의 순차제어형 교류전원 분배장치는 정전후 전원 재투입시 일시에 모든 부하에 전원이 인가되어 과전류가 흐르는 것을 방지하기 위하여 모든 부하를 몇개의 블럭으로나누고 각 부하에 미리 정해진 순서대로 순차적으로 전원을 분배하는 동작 특성을 갖는다.Therefore, the sequentially controlled AC power distribution device of the present invention constituted as FIG. 2 and FIG. 3 divides all the loads into several blocks in order to prevent the over current from being applied to all the loads at the time of power supply again after a power failure. It has an operating characteristic of sequentially distributing power to each load in a predetermined order.

본 발명은 상기에서 설명한 바와 같이 단상교류전원을 이용하는 전력계통 뿐만 아니라 3상교류 전력계통에서도 동일한 방법으로 실시할 수 있다. 즉, 제2도에 있어서 변압기와 주 자동차단기와 부 자동차단기를 3상용으로 대치하고 무접점 릴레이는 3상의 세선에 모두 설치하며, 전류감지용 변류기는 1선에만 설치하고 전압검출단자 A,B는 3상 3선의 두선간에 동일한 방법으로 구성시키면 동일한 동작결과를 얻을 수 있으며, 또한 무접점릴레이 대신에 전자개폐기를 사용하여 구성할 수도 있다.As described above, the present invention can be carried out in the same manner in a three-phase AC power system as well as a power system using a single-phase AC power source. That is, in Fig. 2, the transformer, the main circuit breaker and the sub-circuit breaker are replaced for three phases, and the solid state relay is installed on all three phase wires, and the current sensing current transformer is installed on only one line, and the voltage detection terminals A and B are used. The same operation results can be obtained if the two wires of the three-phase three wires are configured in the same way, and can also be configured by using an electronic switch instead of the contactless relay.

상기한 바와 같이 본 발명에 의하면, 정전후 전원 재투입시에 일시적인 과전류에 의한 자동차단기의 차단작용 또는 퓨즈의 용단에서 오는 재 정전사고를 방지할 수 있고, 또한 사람이 일일이 자동차단기를 수동으로 온 오프해야 하는 불편함을 제거할 수 있으며, 자동차단기 및 퓨즈의 부정확한 동작으로 인한 변압기의 소손을 방지할 수 있다. 또한 본 발명에 의하여 모든 부하를 몇개의 블럭으로 나누면 변압기의 용량을 모든 부하용량에 접근하게 설치할 수 있어서 부하율이 높은 염가의 변전시설을 제공할 수 있는 이점이 있다.As described above, according to the present invention, it is possible to prevent the interruption of the auto circuit breaker due to a temporary overcurrent at the time of power supply re-supply after the blackout or to prevent the power failure of the fuse from the fuse blown. The inconvenience of having to turn off can be eliminated and the transformer can be prevented due to incorrect operation of the circuit breaker and fuse. In addition, by dividing all the load into several blocks according to the present invention, the capacity of the transformer can be installed to approach all load capacities, thereby providing a low-cost substation facility having a high load ratio.

Claims (1)

교류전원을 변압기와 퓨즈를 통하여 주 자동차단기에 연결하고 주 자동차단기로 부터 병렬연결된 각각의 부 자동차단기를 통하여 각 부하에 전원을 공급하는 교류전원 분배장치에 있어서, 주 자동차단기의 입력양단에 저항(R1-R3)을 직렬 연결하고, 주 자동차단기와 복수의 부 자동차단기 사이의 각 부하선로 1선에 각 스위치(SW1-SWn)에 의하여 동작 제어되는 무접점릴레이(SSR1-SSRn)를 연결하며, 부 자동차단기와 부하사이의 각 부하선로 1선에 부하전류 검출용 변류기(CT1-CTn)를 연결하고, 저항(R2)의 양단에 연결된 스위치(SW1) 제어신호로 사용하도록 연결하여서, 스위치(SW1)에 의해 무접점릴레이(SSR1)가 동작하면 변류기(CT1)로 부터 연결된 전류 감지회로 1의 출력신호를 정전 검출회로의 출력신호와 앤드게이트(A2)에서 논리곱하여 스위치(SW2) 제어신호로서 사용하여 스위치(SW2)에 의하여 무접점릴레이(SSR2)가 동작하도록 함으로써 상기한 동작을 반복하여 순차적으로 각 부하에 교류전원을 인가하는 것을 특징으로 하는 순차제어형 교류전원 분배장치.In the AC power distribution device which connects AC power to the main car breaker through transformer and fuse and supplies power to each load through the respective sub car breakers connected in parallel from the main car breaker, resistance at both ends of the input of the main car breaker Solid state relay (SSR 1- ) connected in series with (R 1 -R 3 ) and controlled by each switch (SW 1 -SW n ) on each load line between the main breaker and the plurality of secondary breakers. SSR n ), the load current detection current transformer (CT 1 -CT n ) is connected to each load line between the sub-circuit breaker and the load, and the switch (SW 1 ) connected to both ends of the resistor (R 2 ) Connected to use as a control signal, when the contactless relay SSR 1 is operated by the switch SW 1 , the output signal of the current sensing circuit 1 connected from the current transformer CT 1 is connected to the output signal of the blackout detection circuit and the AND gate. Switch by logical multiplication at (A 2 ) (SW 2 ) By using the control signal, the contactless relay (SSR 2 ) is operated by the switch (SW 2 ) to repeat the above operation by sequentially applying the AC power to each load, characterized in that the control AC Power distribution unit.
KR1019870006163A 1987-06-18 1987-06-18 Devices driding alternating current in order KR900006947B1 (en)

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