KR20040062938A - electric current prevention system and the control method of transformer - Google Patents

electric current prevention system and the control method of transformer Download PDF

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Publication number
KR20040062938A
KR20040062938A KR1020040046752A KR20040046752A KR20040062938A KR 20040062938 A KR20040062938 A KR 20040062938A KR 1020040046752 A KR1020040046752 A KR 1020040046752A KR 20040046752 A KR20040046752 A KR 20040046752A KR 20040062938 A KR20040062938 A KR 20040062938A
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South Korea
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voltage
excitation
transformer
phase
inrush current
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KR1020040046752A
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Korean (ko)
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KR100624496B1 (en
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이상구
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(주)드림파워텍
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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
    • H02H7/04—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 transformers
    • H02H7/055—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 transformers for tapped transformers or tap-changing means thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks
    • H02H1/043—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of dc component by short circuits in ac networks to inrush currents
    • 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
    • H02H7/04—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 transformers
    • H02H7/045—Differential protection of transformers
    • H02H7/0455—Differential protection of transformers taking into account saturation of current transformers

Abstract

PURPOSE: An apparatus for preventing exciting inrush current and exciting over-current in a process for applying initial power to a transformer and a controlling method thereof are provided to interrupt the remaining power and economize the electric energy by controlling automatically the output voltage without generating the exciting inrush current and the exciting over-current. CONSTITUTION: An apparatus for preventing exciting inrush current and exciting over-current in a process for applying initial power to a transformer includes a voltage and phase detector(1), a controller(31), and a microprocessor(30). The voltage and phase detector is used for detecting the initial power of the transformer. The controller is used for controlling a phase control wire. The exciting inrush current and the exciting over-current are removed by applying a phase control method using a magnetic field saturation method and a magnetic resonance method.

Description

변압기의 초기 전원 인가 및 탭 전환시 발생되는 여자돌입전류와 여자 과전류 방지 장치 및 그 제어방법{electric current prevention system and the control method of transformer}Excitation inrush current and excitation overcurrent prevention device generated during initial power-up and tap change of transformer and control method thereof

본 발명은 변압기를 초기 무부하 및 부하시에 전압을 인가하게되면 순간적으로 흐르는 큰 충격전류인 여자 돌입전류(Inrush current)와, 전기를 사용 도중 출력전압의 승압 및 강압을 위한 탭 변경 시 유기전압에 의해 순간적으로 흐르는 여자 과전류를 제한하는 장치 및 그 제어방법에 관한 것으로서,The present invention provides an inrush current, which is a large shock current that flows instantaneously when voltage is applied at the initial no load and load, and an induced voltage when changing a tap for boosting and stepping down the output voltage while using electricity. An apparatus and a control method for limiting an excitation overcurrent that flows instantaneously,

기존에 변압기의 구성 및 그 제어방법에 있어서 전원의 초기투입과, 출력전압조절을 위한 여자권선의 탭전환시 발생하는 여자돌입전류 및 노이즈등으로 인하여 전자기기에 안정된 전류의 공급이 이루어지지 않아 오동작이 발생하거나, 변압기의 수명 또한 짧아지는 원인이 되었다.In the conventional configuration of the transformer and its control method, a stable current is not supplied to the electronic device due to the excitation inrush current and noise generated during the initial input of the power supply and the tap switching of the excitation winding for controlling the output voltage. This occurred, or shortened the life of the transformer.

이에 변압기의 전원 초기투입 또는 출력전압의 조절을 위한 여자권선 탭 전환 시 발생하는 여자 돌입전류(Inrush current)와 여자과전류을 방지하여 변압기 및 전기제품을 보호하며, 스위칭 서어지로부터 안전한 전압자동조절 절전장치 및 그 제어방법이 절실히 요구되는 실정이다.Therefore, it protects transformer and electrical products by preventing inrush current and excitation current generated when switching the excitation winding tap for initial power supply of the transformer or adjusting the output voltage. And the control method is urgently required.

본 발명품은 상기와 같은 제반 문제점을 해결하기 위해 변압기의 초기 전원인가부에 전압·위상검출부(1), 위상제어권선(100)을 추가하고, 위상제어권선(100)을 통해 자계공진 방식과 자기포화 원리를 이용하여 인가전압의 제로점(ZERO POINT)에서 위상을 판별, 유기전압과 전류의 위상을 검출하고, 그 결과를 마이크로 프로세서로 제어되는 조작부를 통해 무접점 반도체 소자를 이용하여 TURN-ON, TURN-OFF 하므로 변압기의 초기 전압 인가시 발생되는 여자돌입전류를 줄이고, 전기 사용 도중 안정된 전력을 공급하기 위한 탭 변경 시 발생할 수 있는 여자 과전류를 줄여 변압기와 전기제품의 안전성과 양질의 전력을 공급함에 기술적 과제를 두고 창안하였다.In order to solve the above problems, the present invention adds a voltage / phase detection unit (1) and a phase control winding (100) to the initial power supply unit of the transformer, and the magnetic resonance method and the magnetic field through the phase control winding (100). Determination of phase at zero point of applied voltage using the saturation principle, detection of phase of induced voltage and current, and the result of the turn-on using a contactless semiconductor device through a microprocessor-controlled control panel. This product reduces the inrush current generated when the initial voltage of the transformer is applied, and reduces the exciting overcurrent that may occur when changing the tap to supply stable power during the use of the transformer. Invented with technical challenges.

도 1은 본 발명의 기술이 적용되는 대표 회로도1 is a representative circuit diagram to which the technique of the present invention is applied.

도 2는 본 발명의 기술이 적용된 단권변압기에 이용되는 회로도2 is a circuit diagram used for a single winding transformer to which the technique of the present invention is applied.

도 3은 본 발명의 기술이 적용된 복권변압기에 이용되는 회로도3 is a circuit diagram used for the lottery transformer to which the technique of the present invention is applied.

도 4는 본 발명의 바람직한 실시예를 설명하기 위한 참고도Figure 4 is a reference diagram for explaining a preferred embodiment of the present invention

도 5는 본 발명의 바람직한 실시예를 설명하기 위한 참고도5 is a reference diagram for explaining a preferred embodiment of the present invention.

도 6은 인가전압과 여자전류와의 위상을 보여주는 참고도6 is a reference diagram showing a phase between an applied voltage and an excitation current

도 7은 인가전압과 여자전류와의 위상을 보여주는 참고도7 is a reference diagram showing a phase between an applied voltage and an excitation current

■도면의 주요 부분에 사용된 부호의 설명■Explanation of symbols used in main part of drawing

1:전압·위상검출부 3:초기전압인가조작부1: Voltage and phase detection unit 3: Initial voltage application control unit

5:위상제어조작부 7:탭전환조작부5: Phase control operation part 7: Tap change control part

3:마이크로프로세스 31:제어부3: microprocess 31: control unit

100:위상제어권선100: phase control winding

도 1은 본 발명의 기술이 적용되는 대표 회로도이고, 도 2는 본 발명의 기술이 적용된 단권변압기에 이용되는 회로도이며, 도 3은 본 발명의 기술이 적용된 복권변압기에 이용되는 회로도이며, 도 4는 본 발명의 바람직한 실시예를 설명하기 위한 참고도이며, 도 5는 본 발명의 바람직한 실시예를 설명하기 위한 참고도이며, 도 6은 인가전압과 여자전류와의 위상을 보여주는 참고도이며, 도 7은 인가전압과 여자전류와의 위상을 보여주는 참고도로서 본 발명 변압기의 초기 전원 인가 및 탭 전환시 발생되는 여자돌입전류와 여자 과전류 방지 장치 및 그 제어방법의 구성 및 작용을 상세히 설명하면,1 is a representative circuit diagram to which the technique of the present invention is applied, FIG. 2 is a circuit diagram used for a single winding transformer to which the technique of the present invention is applied, and FIG. 3 is a circuit diagram used for the lottery transformer to which the technique of the present invention is applied, and FIG. 5 is a reference diagram for explaining a preferred embodiment of the present invention, Figure 5 is a reference diagram for explaining a preferred embodiment of the present invention, Figure 6 is a reference diagram showing the phase of the applied voltage and the excitation current, 7 is a reference diagram showing the phase of the applied voltage and the excitation current. In detail, the configuration and operation of the excitation inrush current and the excitation overcurrent prevention device and its control method generated during initial power-up and tap switching of the transformer of the present invention will be described in detail.

앞서 종래의 기술에서 언급한 바와 같이 전압 인가시 돌입전류(Inrush current)에 의한 충격 때문에 부하의 전기기기에 서어지가 전달되어 제품 수명에영향을 주며, 변압기에도 서어지 때문에 절연 내력 약화 및 수명에 치명적인 영향을 줌으로 변압기의 안정적 사용에 어려움이 있었다. 이러한 원인의 돌입전류가 흐르는 주요인은,As mentioned in the prior art, surges are transmitted to the electrical equipment of the load due to the impact caused by the inrush current when voltage is applied, which affects the product life. Influences made it difficult to reliably use transformers. The main factor through which the inrush current of this cause flows,

① 인가전압을 위상이 0 에서 투입한 경우.① When the applied voltage is inputted at 0 phase.

② 전원(계통)임피던스가 적은 경우.② When the power (system) impedance is low.

③ 철심에 잔류자속이 있을 경우.③ If there is residual flux in the core.

④ 냉간압연 철심 또는 저압측에서 여자하는 경우이다.④ Excitation in cold-rolled iron core or low pressure side.

상기 여자돌입전류가 발생하지 않게 하기 위해서는 도 6에 도시된 바와 같이 무부하 상태에서 인가전압의 위상이 파고치에서 투입될 경우 여자전류는 누설 리액턴스의 영향으로 전압의 위상보다 늦은 0 에서 시장하여 전압파형과 같은 정현파로 변화하며 안정된 상태를 유지한다. 더욱 자세히 설명하면, 철심은 잔류자속이 없는 무부하 상태이므로 여자전류가 매우 적어 포화되지 않으므로 유기전압 및 여자전류의 파형이 정현파가 되어 큰 돌입전류는 흐르지 않게 되는 것이다.In order to prevent the excitation inrush current from occurring, as shown in FIG. 6, when the phase of the applied voltage is input at the crest value under no load, the excitation current is marketed at zero later than the phase of the voltage under the influence of leakage reactance, and thus the voltage waveform. It changes to sinusoidal wave like and maintains stable state. In more detail, since the core is a no-load state with no residual magnetic flux, the excitation current is very small and is not saturated, so the waveform of the induced voltage and excitation current becomes a sine wave so that a large inrush current does not flow.

그러나, 실제 사용상에서는 대부분 부하상태에서 전압을 인가하며, 부하 상태일 경우에도 위상이 제각기여서 위상이 최대 일 때 투입한다는 것은 불가능하여 전압 인가시 발생하는 돌입전류(Inrush current)에 의한 충격 때문에 부하의 전기기기에 서어지가 전달되어 제품 수명에 영향을 주며, 변압기에도 서어지 때문에 절연 내력 약화 및 수명에 치명적인 영향을 주고 있다. 도7을 참고로 설명하면, 인가 전압의 위상이 0에서 투입될 경우 여자전류는 전압의 위상보다 늦으므로, 철심의자속은 0 (잔류자속이 0 이므로) 상태에서 순간적으로 파고치(ψm)까지 도달 하며, 또한 전압이 Vo→ Vm→ Vo로 변화하는 반주기동안 자속은 ψo→ ψm→ ψo→ -ψm 및 직류성분의 합성치 (돌입전류의 파형도 동일하게 변화)로 변화하여 변화폭은 2ψm으로 이 과정에서 철심이 포화하고, 이 자속을 만들이 위하여 여자전류가 급증하여 큰 여자 돌입전류(Inrush current)가 발생하게 되는 것이다.However, in practical use, the voltage is applied in most of the load conditions, and even under load conditions, it is impossible to input when the phase is maximum, so it is impossible to apply the voltage due to the inrush current generated during voltage application. Surge is transmitted to electrical equipment to affect the life of the product, and because of surge in the transformer, it has a fatal effect on the weakened dielectric strength and life. Referring to FIG. 7, the excitation current is later than the phase of the voltage when the applied voltage is applied at zero, so that the magnetic flux of the iron core is momentarily up to the crest value in the state of 0 (since the residual magnetic flux is 0). In addition, the magnetic flux changes to ψo → ψm → ψo → -ψm and the combined value of the DC component (the same waveform of inrush current changes) during the half cycle of voltage change from Vo to Vm to Vo. In the process, the iron core saturates, and the excitation current rapidly increases to generate this magnetic flux, which causes a large excitation current.

이에 본 발명의 구성을 설명하면,Referring to the configuration of the present invention,

입력측의 전압과 위상을 검출하는 전압·위상 검출부와 이를 비교 및 분석하는 마이크로 프로세스, 제어부를 통해 조작되는 초기전압 인가 조작부와 제3차 권선 조작부 및 탭 전환 조작부로 되며, 이들의 동작에 의해 초기 전원 인가시 여자돌입전류(Inrush current)를 방지하고, 전기를 사용하는 도중 출력전압을 승압 및 강압 하기 위한 탭 전환시 유기전압에 의한 여자 과전류를 방지하는 장치로 구성되어, 전원 인가시 발생되는 돌입전류 및 노이즈를 제거함으로써 전기기기에 발생 할 수 있는 오동작 및 변압기의 절연 내력을 최대화할 수 있다.Voltage and phase detection unit for detecting voltage and phase of input side, micro process for comparing and analyzing them, initial voltage applying operation unit operated through control unit, tertiary winding operation unit and tap switching operation unit. It is composed of a device that prevents the inrush current when applied and prevents the over-current caused by the induced voltage when switching the tap to boost and step down the output voltage during the use of electricity. And by removing the noise can be maximized the malfunction of the electrical equipment and the dielectric strength of the transformer.

본 발명의 바람직한 실시 예를 첨부된 도면에 따라서 상세히 설명한다.Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도1에 도시된 바와 같이 입력측의 전원을 받아 전압과 위상을 검출하는 전압·위상 검출부(1)와 이를 비교, 분석하는 마이크로 프로세스부(30), 마이크로 프로세스부에 의해 명령되는 기능을 수행하는 제어부(31), 제어부(31)에 의해 초기전원 인가시 작동되는 초기전압인가조작부(3)와 전기 사용 도중 탭 전환시에 조작되는탭전환조작부(7)에 있어서,As shown in FIG. 1, a voltage / phase detection unit 1 that receives power from an input side and detects voltage and phase, a microprocessor unit 30 that compares and analyzes the same, and a controller that performs a function commanded by the microprocessor unit. (31), in the initial voltage applying operation unit (3) operated by the control unit (31) when initial power is applied, and in the tap change operation unit (7) operated at the time of tap change during electric use,

도4를 참고로 하여 전원의 초기 인가 시 과정을 설명하면, 전압·위상 검출부(1)에서 전압과 위상을 검출, 이를 비교, 분석하는 마이크로 프로세스부(30)가 제어부(31)로 명령을 전달하고 위상제어조작부(3)에서는 위상제어권선(100)에 유기되는 전압의 위상을 판별하게 되어, 이를 TURN-ON 시켜 변압기를 자계 포화와 자기 공진을 시켜서 초기 여자 돌입전류을 방지함과 동시에 초기전압인가조작부(3)에 의해 스위치를 ON 시킨 후에 마이크로 프로세스(30)가 제어부(31)에 명령을 전달하여 위상제어조작부(5)에서 위상제어권선(100)을 TURN-OFF 하여 안전하게 전원을 공급한다.Referring to FIG. 4, when the initial application of the power supply is described, the microprocessor 30 which detects, compares, and analyzes the voltage and phase in the voltage / phase detection unit 1 transmits a command to the control unit 31. The phase control operation section 3 determines the phase of the voltage induced in the phase control winding 100, and turns it on, thereby causing the transformer to have magnetic field saturation and magnetic resonance, thereby preventing initial excitation inrush current and applying initial voltage. After the switch is turned on by the operation unit 3, the microprocessor 30 transmits a command to the control unit 31 to turn off the phase control winding 100 in the phase control operation unit 5 to safely supply power.

전기 사용 도중에 출력전압의 승압 및 강압을 위해 탭을 전환할 때에는 전압·위상검출부(1)에서 전압과 위상을 검출하며, 이를 마이크로 프로세스부(30)가 비교, 분석하여 그 결과를 제어부(31)를 통해 위상제어조작부(5)로 전달하면 상기 조작부(5)는 위상제어권선(100)에 유기되는 전압의 위상을 판별하여 위상제어권선(100)을 TURN-ON 하여, 변압기를 자계 포화와 자기 공진을 시켜서 탭 전환시 여자 과전류의 생성을 방지하고, 마이크로 프로세스(30)가 제어부(31)에 명령을 전달하여 탭전환조작부(7)에서 탭 변경 후에 위상제어권선을 TURN-OFF 하여 안전하게 전원을 공급한다. 즉, 도 2, 3과 5를 참고로 하여 출력전압의 승압 및 강압을 위한 탭 전환 시의 작동을 더욱 상세히 설명하면 지속적으로 전압·위상검출부(1)에서 검출하여 탭 변경 시점의 1초전에 마이크로프로세스부(30)에서 제어부(31)로 신호를 전달하여 위상제어조작부(5)가 위상제어권선(100)을 TURN-ON 하게 되고 이때, 입력과 위상제어권선의 위상이 동기가 되게 하고 3초간 작동한다. 위상제어권권선(100)을 3초간 TURN-ON 하였을 때 탭 변환시점에서 도2에 도시된 바와 같이 무접점 반도체 소자는 1탭(1차 여자권선)에서 2탭(2차 여자권선)으로 1초간 위상제어권선(100)이 ON 된 후, 1탭의 전자식 릴레이가 OFF 되고 15msec 후에 1탭의 무접점반도체 소자가 OFF 되며, 15msec 후에 무접점반도체 소자가 ON 된 후에 15msec 후에 전자식 릴레이가 ON 된다. 위상제어권선(100)에서 작동될 때, 입력 전원과 전환 탭의 위상은 동일해야 하고, 탭 변환시 전류는 동위상 일때 유도 공진 전류가 흐르고, 여기서 공진시 구형파의 공진 전류가 발생하여 자계를 포화시키게 되는 것이다. 상기의 전자식 릴레이는 순간 펄스나 과전류를 방지하기 위하여 전압의 변성을 소프트하게 하기 위함이다.When switching taps for boosting and stepping down the output voltage during the use of electricity, the voltage and phase detection unit 1 detects the voltage and phase, and the microprocessor unit 30 compares and analyzes the result and controls the result. When the control unit 5 transmits the phase control operation unit 5 to the phase control operation unit 5, the operation unit 5 determines the phase of the voltage induced in the phase control winding 100, and turns the phase control winding 100 on, thereby turning the transformer into magnetic field saturation and magnetism. Resonance prevents the generation of an excitation overcurrent at the tap change, and the microprocessor 30 transmits a command to the control part 31 to turn off the phase control winding after the tap change in the tap change operation part 7 to safely turn on the power supply. Supply. 2, 3, and 5, the operation at the time of tap switching for the step-up and step-down of the output voltage will be described in more detail. The process unit 30 transmits a signal to the control unit 31 so that the phase control operation unit 5 turns the phase control winding 100 to turn on. At this time, the phase of the input and the phase control winding is synchronized, and for 3 seconds. Works. When the phase control winding 100 is turned on for 3 seconds, as shown in FIG. 2 at the time of tap change, the contactless semiconductor device is moved from 1 tap (primary excitation winding) to 2 taps (second excitation winding) for 1 second. After the phase control winding 100 is turned on, the electronic relay of one tap is turned off and the contactless semiconductor element of one tap is turned off after 15 msec, and the electronic relay is turned on after 15 msec after the contactless semiconductor element is turned on after 15 msec. When operated in the phase control winding 100, the phase of the input power supply and the switching tap must be the same, and the induction resonance current flows when the current is in phase when the tap change is performed, where the resonance current of the square wave is generated to saturate the magnetic field. Will be. The above electronic relay is to soften the voltage variation in order to prevent a momentary pulse or overcurrent.

상기와 같은 구성으로 이루어진 단권 및 복권 변압기를 전압 변성이 적은 전기 절전기에 적용하면 입력전압이 변동해도 여자 돌입전류 및 여자 과전류의 발생없이 출력전압을 무정전으로 자동조절하여 일정범위의 전압을 계속 공급하므로 잉여전력을 차단하여 전기에너지를 절약하며, 변압기 및 전기제품의 절연내력에 영향을 끼치지 않는 양질의 전력을 공급할 수 있다.Applying a single winding and a lottery transformer having the above configuration to an electric power saver with a low voltage variation, the output voltage is uninterrupted automatically without supplying excitation inrush current and excitation overcurrent even if the input voltage fluctuates so that a constant range of voltage is continuously supplied. It saves electric energy by cutting off surplus power, and can supply high-quality power that does not affect the insulation strength of transformers and electrical appliances.

따라서, 본 발명품을 잉여전력 차단 절전기에 적용시 전력회사의 입력전압이변동하여도 출력전압이 안정되므로 전기제품에 손상이 없으며, 날로 고조되고 있는 석유위기 등 에너지 위기에 전기 에너지를 절약하므로 기업의 경쟁력 강화에도 크게 기여할 수 있는 그 효과가 다대한 발명인 것이다.Therefore, when the present invention is applied to a surplus power cut-off power saver, the output voltage is stabilized even if the input voltage of the power company changes, so that there is no damage to the electric products, and it saves electric energy in the energy crisis, such as the oil crisis, which is rising day by day The effect that can greatly contribute to strengthening the competitiveness is a great invention.

Claims (3)

여자 권선을 다양하게 결선하여 전압 자동조절을 원활히 하기 위한 무정전 전압자동조절 및 잉여전력차단 절전기에 있어서,In the uninterruptible voltage automatic regulation and surplus power cut-off power saver to smoothly adjust the voltage by connecting various excitation windings, 변압기 초기 전압인가 시 이를 감지하는 전압·취상검출부(1)와 위상제어권선(100)을 구성하고, 이를 통제하는 제어부(31)와 마이크로프로세스부(30)를 구성하여, 자계포화 방식과 자기공진 방식을 응용한 위상제어방법에 의해 여자 돌입전류(Inrush current)와 여자과전류를 제거하는 것을 포함하는 변압기의 초기 전원 인가 및 탭 전환시 발생되는 여자돌입전류와 여자 과전류 방지 장치 및 그 제어방법A voltage shunt detection unit (1) and a phase control winding (100) for detecting the initial voltage applied to the transformer are configured, and a control unit (31) and a microprocessor unit (30) are configured to control the magnetic field saturation method and magnetic resonance. Excitation inrush current and excitation overcurrent prevention device generated during initial power-up and tap switching of a transformer, including removing the inrush current and the excitation overcurrent by a phase control method applying the method, and a control method thereof 제 1항에 있어서,The method of claim 1, 변압기는 도 2, 3에 도시된 구성의 회로로 이루어진 것을 포함하는 단권 및 복권변압기인 것을 포함하는 초기 전원 인가 및 탭 전환시 발생되는 여자돌입전류와 여자 과전류 방지 장치 및 그 제어방법The transformer is an inrush current and an excitation overcurrent protection device generated during initial power-up and tap switching, including a single winding and a double winding transformer including a circuit having the configuration shown in FIGS. 2 and 3, and a control method thereof. 제1항에 있어서,The method of claim 1, 위상제어방법은 자계공진 방식과 자기포화 원리를 이용하여 인가전압의 제로점(ZERO POINT)에서 위상을 판별, 유기전압과 전류의 위상을 검출하고, 그 결과를 마이크로프로세서(30)로 제어되는 조작부(31)를 통해 무접점반도체소자를 이용하여 TURN-ON, TURN-OFF 하여 변압기의 초기 전압 인가시 발생되는 여자돌입전류와 탭 변경 시 발생할 수 있는 여자 과전류를 제거하는 것을 포함하는 초기 전원 인가 및 탭 전환시 발생되는 여자돌입전류와 여자 과전류 방지 장치 및 그 제어방법The phase control method uses a magnetic resonance method and a magnetic saturation principle to determine a phase at a zero point of an applied voltage, detect a phase of an induced voltage and a current, and control the result of the control by the microprocessor 30. Initial power supply including turning off and turning off using a solid-state semiconductor device (31) to remove the excitation inrush current generated when the initial voltage of the transformer is applied and the excitation overcurrent that may occur when the tap is changed. Excitation inrush current and excitation overcurrent prevention device generated during tap change and control method
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KR100868696B1 (en) * 2006-11-01 2008-11-13 한전케이디엔주식회사 Switching System for Load Distribution
CN109586249A (en) * 2018-12-12 2019-04-05 国网河北省电力有限公司电力科学研究院 Method for Identifying Transformer Inrush Current and device

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KR100945721B1 (en) 2008-04-30 2010-03-08 성균관대학교산학협력단 Apparatus for Decreasing Inrush Current Using SFCL, and Decision Method for Optimum Resistance thereof
KR102220529B1 (en) 2020-09-11 2021-02-25 동아전기 주식회사 Transformer power tap changer automatic switching method and system
KR102431328B1 (en) 2020-09-22 2022-08-11 동아전기 주식회사 Power system cross over control device and method
KR102466263B1 (en) 2020-10-27 2022-11-10 한우석 Method and device for switching a power adjustment tap in transformer

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JPH06261444A (en) * 1993-03-05 1994-09-16 Fuji Electric Co Ltd Method and equipment for suppressing exciting rush current of transformer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100868696B1 (en) * 2006-11-01 2008-11-13 한전케이디엔주식회사 Switching System for Load Distribution
CN109586249A (en) * 2018-12-12 2019-04-05 国网河北省电力有限公司电力科学研究院 Method for Identifying Transformer Inrush Current and device

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