KR101326598B1 - Performance test apparatus of emergency power supply - Google Patents

Performance test apparatus of emergency power supply Download PDF

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KR101326598B1
KR101326598B1 KR1020120034501A KR20120034501A KR101326598B1 KR 101326598 B1 KR101326598 B1 KR 101326598B1 KR 1020120034501 A KR1020120034501 A KR 1020120034501A KR 20120034501 A KR20120034501 A KR 20120034501A KR 101326598 B1 KR101326598 B1 KR 101326598B1
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voltage
current
load
emergency power
power
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KR1020120034501A
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Korean (ko)
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KR20130112260A (en
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고광용
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도로교통공단
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/1659—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 to indicate that the value is within or outside a predetermined range of values (window)
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/185—Electrical failure alarms

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

본 발명은 비상전원에 연결된 부하를 가변시키면서 비상전원의 출력상태를 시험하는 비상전원 성능검사장치에 관한 것으로, 개별부하검사에서 전압 전류상태를 검사할 수 있으며, 전체부하검사에서 전력량을 검사할 수 있도록 한 비상전원 성능검사장치이다.The present invention relates to an emergency power performance tester that tests the output state of the emergency power while varying the load connected to the emergency power source, and can test the voltage and current state in the individual load test, and can check the amount of power in the full load test. Emergency power performance tester.

Description

비상전원의 성능검사장치{PERFORMANCE TEST APPARATUS OF EMERGENCY POWER SUPPLY} Performance Test Equipment of Emergency Power {PERFORMANCE TEST APPARATUS OF EMERGENCY POWER SUPPLY}

본 발명은 무정전전원장치(UPS: Uninterruptible Power Supply) 또는 배터리(이하 '비상전원'이라 함)의 출력성능을 검사하기 위한 성능검사장치에 관한 것으로, 상세하게는 비상전원에 연결된 부하를 가변시키면서 비상전원의 출력상태를 시험하는 비상전원 성능검사장치에 관한 것이다.The present invention relates to a performance test apparatus for inspecting the output performance of an uninterruptible power supply (UPS) or a battery (hereinafter referred to as an "emergency power supply"). An emergency power supply performance tester for testing the output state of a power supply.

일반적으로 비상전원은 정전시에 부하에 전원을 공급하기 위한 장치로 설계된 정격 용량을 만족시켜야 할 뿐만 아니라 다양한 부하상태에 따라서 양질의 전원을 부하에 공급하여야 하며, 다양한 부하상태에 따라서 정상출력이 이루어져야 한다. 특허출원 제1996-069956호(발명의 명칭: 펄스폭변조 정류기를 이용한 다기능 부하시험기 및 부하시험방법)(이하 '종래기술'이라 함)는 이러한 비상전원에 연결되는 가변부하의 한 형태를 제공한다.In general, the emergency power supply must not only satisfy the rated capacity designed as a device for supplying power to the load in case of power failure, but must also supply high-quality power to the load according to various load conditions, and normal output must be made according to various load conditions. do. Patent application No. 1996-069956 (name of the invention: multi-function load tester and load test method using pulse width modulated rectifier) (hereinafter referred to as 'prior art') provides a form of variable load connected to such an emergency power source. .

도 1은 종래기술의 부하시험기의 회로도이다.1 is a circuit diagram of a load tester of the prior art.

종래기술의 부하시험기는 펄스폭변조정류기(1)에 정류기 제어회로로 제어하는 파워스위칭소자(PS)를 연결함과 더불어 다이오드(D)와 부하저항(RL)을 병렬로 연결한 구성으로 펄스폭변조정류기(1)로 신호의 위상을 변화시키고, 파워스위칭소자(PS)로 부하의 크기 및 역률을 무단으로 변화시켜 다수의 부하량을 구할 수 있으므로 부하시험을 간편하고 용이하게 할 수 있도록 하는 것이다.The load tester according to the related art has a pulse width in which a pulse width variable rectifier 1 is connected to a power switching element PS controlled by a rectifier control circuit, and a diode D and a load resistor RL are connected in parallel. The modulating rectifier 1 changes the phase of the signal, and the power switching element PS changes the size and power factor of the load without permission to obtain a large number of loads, thereby simplifying and facilitating the load test.

그러나 이러한 종래기술에서는 부하의 상태를 가변시키는 기술구성은 개시되어 있으나, 이와 같은 부하상태에 따라서 UPS 또는 배터리가 정상적인 출력상태를 유지하는지를 전혀 판단할 수 없다.However, in the related art, a technical configuration for varying the state of a load is disclosed, but it is impossible to determine whether the UPS or the battery maintains a normal output state at all according to the load state.

본 발명은 다양한 부하상태에 따라서 UPS 또는 배터리 등의 비상전원이 정격용량을 구비하는지, 부하상태에 따라서 순시전력 상태가 설계된 상태로 작동하는지를 검사하는 검사장치를 제공하기 위한 것이다.The present invention is to provide an inspection apparatus for inspecting whether an emergency power source such as a UPS or a battery has a rated capacity according to various load conditions, and whether the instantaneous power state is operated according to the load state.

상기 과제를 해결하기 위한 해결수단은 비상전원에 연결되는 가변부하를 특정한 부하값으로 설정하고 출력성능을 검사하는 비상전원 성능검사장치에 있어서: 상기 특정한 부하값에서 상기 비상전원으로부터 출력되는 전압, 전류를 검출하여 디지털 신호로 변환하는 전압전류A/D변환부; 상기 특정한 부하값에서 출력되어야 할 기설정된 전압, 전류 값이 저장되고, 상기 전압전류A/D변환부로부터 입력되는 전압, 전류와 저장된 기설정된 전압, 전류를 비교하여 설정된 오차를 벗어나게 되면 전압, 전류 오차를 판정하는 마이컴을 포함하고, 상기 마이컴은 상기 전압전류A/D변환부로부터 입력되는 전압, 전류로부터 순시전력을 산출하고, 상기 순시전력이 기설정된 순시전력 이하로 떨어지는 시점까지의 사용전력량을 산출하고, 기설정된 전력용량과 비교하여 기설정된 범위를 벗어나게 되면 용량에러판정을 하는 것이다.In the emergency power performance testing apparatus for setting the variable load connected to the emergency power source to a specific load value and checking the output performance, the solution means for solving the problem: a voltage, current output from the emergency power at the specific load value A voltage current A / D converter for detecting and converting the signal into a digital signal; The predetermined voltage and current value to be output at the specific load value are stored, and when the voltage and current are out of the set error by comparing the voltage and current input from the voltage current A / D converter with the stored predetermined voltage and current, the voltage and current And a microcomputer for determining an error, wherein the microcomputer calculates instantaneous power from the voltage and current input from the voltage current A / D converter, and calculates the amount of power used until the instantaneous power falls below a predetermined instantaneous power. If the calculation is out of the preset range compared to the preset power capacity, the capacity error is determined.

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상기 과제와 해결수단을 갖는 본 발명에 따르면, 각각의 부하상태에 따라서 원하는 출력상태와 실제 출력상태를 정확히 비교할 수 있어 정확한 검사가 이루어질 수 있으며, 전력용량을 비교가 최단시간에 이루어질 수 있다. 뿐만 아니라 이러한 개별부하검사 및 전력용량을 검사하기 위한 전체부하검사가 마이컴의 정해진 수순에 따라 수행되기 때문에 검사인력을 감축할 수 있으며, 검사의 객관성 및 신뢰성을 높일 수 있다. According to the present invention having the above problems and solving means, it is possible to accurately compare the desired output state and the actual output state according to each load state can be made an accurate inspection, the power capacity can be compared in the shortest time. In addition, since the individual load test and the full load test to check the power capacity is performed according to the prescribed procedure of the microcomputer, the inspection manpower can be reduced, and the objectivity and reliability of the test can be improved.

도 1은 종래기술의 부하시험기의 회로도이다.
도 2는 본 발명의 일실시예의 전체 구성도이다.
도 3은 본 발명에 적용되는 회로 블록도이다.
도 4는 본 발명의 동작수순을 설명하는 순서도이다.
도 5는 본 발명의 전력량을 실시간으로 나타낸 그래프이다.1 is a circuit diagram of a load tester of the prior art.
2 is an overall configuration diagram of an embodiment of the present invention.
3 is a circuit block diagram applied to the present invention.
4 is a flowchart illustrating the operation procedure of the present invention.
5 is a graph showing the power amount of the present invention in real time.

이하 첨부되는 도면에 의거 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 일실시예의 전체 구성도이다.2 is an overall configuration diagram of an embodiment of the present invention.

도 2에 도시된 비상전원장치(10)는 상용전원이 정전 등으로 부하에 전원을 더 이상 공급할 수 없을 때 상용전원을 대신하여 전원을 부하에 공급하기 위한 것으로, 무정전전원장치(UPS) 또는 배터리 등 다양한 설비를 예로 들 수 있다. The emergency power device 10 shown in FIG. 2 is to supply power to the load in place of the commercial power when the commercial power can no longer supply power to the load due to a power failure, such as an uninterruptible power supply (UPS) or a battery And various equipment.

비상전원장치(10)는 부하가 가변되는 성능검사장치(30)와 연결되고, 성능검사장치(30)는 가변되는 부하에서 비상전원장치(10)의 성능상태를 검사한다. The emergency power supply device 10 is connected to the performance test device 30 in which the load is variable, and the performance test device 30 checks the performance state of the emergency power supply device 10 in the variable load.

성능검사장치(30)의 외면에는 특정 명령을 입력시키고, 성능검사결과를 화면에 표시하는 표시화면이 구비되는 입출력부(20)와 부하를 수동으로 가변시키는 수동스위치(32)들이 설치된다. On the outer surface of the performance test device 30 is provided an input / output unit 20 having a display screen for inputting a specific command and displaying the result of the performance test and a manual switch 32 for manually varying the load.

도 3은 본 발명에 적용되는 회로 블록도이다.3 is a circuit block diagram applied to the present invention.

도 3에 도시된 성능검사장치(30)는 비상전원장치(10)로부터 공급되는 전원선(+), (-) 사이에 설치되어 변류기(301)로부터 감지된 전류와 (+), (-)선의 전압을 입력받아 디지털 신호로 변환하는 전류전압 A/D변환부(303)와, (+), (-)선 사이에 설치되는 부하선(111), (112), (113), (114), (115), (116), (117)들을 구비한다. 이때 각 부하선(111), (112), (113), (114), (115), (116), (117)에는 부하Z1, Z2, Z3, Z4, Z5, Z6, Z7가 설치되며, 각 부하들과 (+)선 사이에는 릴레이RY1, RY2, RY3, RY4, RY5, RY6, RY7가 설치되고, 각 부하들과 (-) 선 사이에는 수동 스위치(32)들이 각각 설치된다. 이때 각각의 부하Z1, Z2(>Z1), Z3(>Z2), Z4(>Z3), Z5(>Z4), Z6(>Z5), Z7(>Z6)는 저항성, 용량성, 유도성 부하들로 다양하게 선택 사용될 수 있으나 설명의 편의상 저항으로 도시하고 저항부하를 기준으로 설명하기로 한다.The performance test apparatus 30 shown in FIG. 3 is installed between the power lines (+) and (-) supplied from the emergency power supply device 10 and the current sensed from the current transformer 301 and (+) and (-). Load lines 111, 112, 113, and 114 provided between the current voltage A / D converter 303 which receives the voltage of the line and converts it into a digital signal, and the (+) and (-) lines. ), 115, 116, and 117. In this case, loads Z1, Z2, Z3, Z4, Z5, Z6, and Z7 are installed in the load lines 111, 112, 113, 114, 115, 116 and 117, respectively. Relays RY1, RY2, RY3, RY4, RY5, RY6, and RY7 are provided between the respective loads and the positive line, and manual switches 32 are respectively provided between the respective loads and the negative line. Each load Z1, Z2 (> Z1), Z3 (> Z2), Z4 (> Z3), Z5 (> Z4), Z6 (> Z5), Z7 (> Z6) are resistive, capacitive and inductive loads. As a variety of selection can be used, but for convenience of description it will be described as a resistance and based on the resistance load.

또한 성능검사장치(30)는 전압전류 A/D변환부(303)로부터 전압, 전류 디지털 신호를 입력받고 프로그램된 수순에 따라서 릴레이RY1, RY2, RY3, RY4, RY5, RY6, RY7들을 작동시키는 릴레이 구동부(305)에 구동신호를 전송하고, 각 부하상태에 따라서 기설정된 성능검사를 수행하도록 하는 마이컴(33)을 구비한다.In addition, the performance tester 30 receives the voltage and current digital signals from the voltage / current A / D converter 303 and relays the relays RY1, RY2, RY3, RY4, RY5, RY6, and RY7 according to the programmed procedure. The microcomputer 33 transmits a driving signal to the driving unit 305 and performs a predetermined performance test according to each load state.

도 4는 본 발명의 동작수순을 설명하는 순서도이다.4 is a flowchart illustrating the operation procedure of the present invention.

본 발명의 동작수순은 S1 내지 S7로 이루어지는 개별부하 시험단계, S8 내지 S11로 이루어지는 전체부하 시험단계로 이루어진다.The operation procedure of the present invention consists of an individual load test step consisting of S1 to S7, and a full load test step consisting of S8 to S11.

입출력부(20)로부터 시험시작 버튼이 터치되어 시험시작 명령이 마이컴(33)에 입력되면 마이컴(33)은 자동검사인지, 수동검사인지를 검출하여 수동검사인 경우에는 수동스위치(32)를 작동시켜 특정부하를 선택하도록 하고, 자동검사인 경우에는 릴레이구동부(305)를 구동시켜 특정부하를 선택하도록 한다(S2), (S3), (S4).When the test start button is touched from the input / output unit 20 and the test start command is input to the microcomputer 33, the microcomputer 33 detects whether the test is an automatic test or a manual test, and in the case of the manual test, operates the manual switch 32. In order to select a specific load, and in the case of automatic inspection, the relay driving unit 305 is driven to select a specific load (S2), (S3) and (S4).

마이컴(33)은 특정부하에서 기설정된 T1시간 동안 전압전류 A/D 변환부(303)로부터 전압, 전류를 입력받아 저장부에 저장하고, 기설정된 시간T1이 경과되면 다른 부하를 선택하도록 릴레이구동부(305)를 구동시켜 각각의 부하들을 한번씩 선택하도록 하여 T1 시간동안 전압, 전류가 저장되도록 한다(S5, S6, S7).The microcomputer 33 receives the voltage and current from the voltage / current A / D converter 303 for a preset T1 time at a specific load and stores the voltage and current in the storage, and selects another load when the predetermined time T1 elapses. 305 is driven to select each load once so that voltage and current are stored for a time T1 (S5, S6, S7).

이와 같이 특정부하를 선택하여 전압 전류를 산출하는 개별부하 시험단계가 종료되면 전체 용량을 결정하도록 임피이던스 값, 즉 전체 저항값이 최소화되도록 하여 용량산출시간이 짧아지도록 한다. 따라서 마이컴(33)은 전체 부하들의 합성 임피이던스가 최소화되는 릴레이 구동신호를 릴레이구동부(305)에 공급한다(S8). As such, when the individual load test step of selecting the specific load and calculating the voltage current is completed, the impedance calculation time is shortened by minimizing the impedance value, that is, the total resistance value, to determine the total capacity. Accordingly, the microcomputer 33 supplies the relay driving signal to the relay driver 305 in which the combined impedance of all the loads is minimized (S8).

도 2에 도시된 바와 같은 저항결선에서는 (+), (-) 선에 대하여 전체 부하들이 병렬 연결되도록 한다. 마이컴(33)은 전체 부하들이 병렬 연결된 상태에서 전압전류 A/D 변환부(303)로부터 전압, 전류를 입력받아 저장한다(S9).In the resistance connection as shown in FIG. 2, all loads are connected in parallel with respect to the (+) and (-) lines. The microcomputer 33 receives and stores the voltage and current from the voltage current A / D converter 303 while all the loads are connected in parallel (S9).

또한 마이컴(33)은 단계S5에서 저장된 각 부하별로 측정되어 저장된 순간전압, 전류들과 각 부하에서 출력되어야 할 이상적인 전압 전류인 기설정된 기준전압, 전류들을 비교하여 설정된 값 이상의 오차가 발생하게 되면 전압, 전류 에러판정을 하게 되고, 단계S9에서 전압, 전류들로부터 용량을 검출하여 기설정된 용량에 대하여 설정된 범위를 벗어나게 되면 용량 에러 판정을 하게 된다.In addition, the microcomputer 33 is measured for each load stored in step S5 and compares the stored instantaneous voltage and currents with a predetermined reference voltage and currents, which are ideal voltage currents to be output from each load. When the current error is determined, the capacitance is detected from the voltage and the current in step S9, and the capacitance error is determined when it is out of the range set for the predetermined capacitance.

도 5는 본 발명의 전력량을 실시간으로 나타낸 그래프이다.5 is a graph showing the power amount of the present invention in real time.

도 5의 그래프에서 부하의 임피이던스가 전체 병렬로 연결될 때에 비상전원장치(10)로부터 출력될 수 있는 이론적인 순시전력은 PS로서 비상전원장치(10)의 사용가능 순시전력은 기설정되는 Pr= 0.8PS로 떨어지는 시점까지 사용될 수 있다. The theoretical instantaneous power that can be output from the emergency power supply 10 when the impedance of the load is connected in parallel in the graph of FIG. 5 is P S , and the usable instantaneous power of the emergency power supply 10 is P r which is preset. Can be used to the point where it falls to = 0.8P S.

따라서 마이컴은 0.8PS로 떨어지는 시점T2를 검출하고, 이때까지 그래프에서 빗금친 면적과 동일한 누적된 사용 전력량을 실시간의 전력을 적분하여 산출하고, 이와 같이 누적된 사용 전력량과 기설정된 용량의 차분을 구하여 기설정된 오차를 벗어나게 되면 용량 에러판정을 한다.
Therefore, the microcomputer detects the time point T2 falling to 0.8 P S , calculates the accumulated power consumption equal to the area shaded in the graph by integrating the power in real time, and calculates the difference between the accumulated power consumption and the preset capacity. If it is found out of the preset error, the capacity error is judged.

Claims (4)

비상전원에 연결되는 가변부하를 특정한 부하값으로 설정하고 출력성능을 검사하는 비상전원 성능검사장치에 있어서:
상기 특정한 부하값에서 상기 비상전원으로부터 출력되는 전압, 전류를 검출하여 디지털 신호로 변환하는 전압전류A/D변환부;
상기 특정한 부하값에서 출력되어야 할 기설정된 전압, 전류 값이 저장되고, 상기 전압전류A/D변환부로부터 입력되는 전압, 전류와 저장된 기설정된 전압, 전류를 비교하여 설정된 오차를 벗어나게 되면 전압, 전류 오차를 판정하는 마이컴을 포함하고,
상기 마이컴은 상기 전압전류A/D변환부로부터 입력되는 전압, 전류로부터 순시전력을 산출하고, 상기 순시전력이 기설정된 순시전력 이하로 떨어지는 시점까지의 사용전력량을 산출하고, 기설정된 전력용량과 비교하여 기설정된 범위를 벗어나게 되면 용량에러판정을 하는 것을 특징으로 하는 비상전원 성능검사장치.In the emergency power performance tester that sets the variable load connected to the emergency power to a specific load value and checks the output performance:
A voltage current A / D converter configured to detect a voltage and a current output from the emergency power at the specific load value and convert the voltage and current into a digital signal;
The predetermined voltage and current value to be output at the specific load value are stored, and when the voltage and current are out of the set error by comparing the voltage and current input from the voltage current A / D converter with the stored predetermined voltage and current, the voltage and current Including microcomputer to judge error,
The microcomputer calculates instantaneous power from the voltage and current input from the voltage current A / D converter, calculates the amount of power used until the instantaneous power falls below a predetermined instantaneous power, and compares it with a preset power capacity. Emergency power performance tester, characterized in that the capacity error is determined when out of the preset range. 삭제delete 청구항1에서, 상기 비상전원 성능검사장치는 비상전원의 (+), (-) 전원선 사이에 부하와 릴레이들이 설치된 복수개의 부하선들과, 상기 마이컴으로부터 구동신호를 전송받아 상기 릴레이들을 구동시키는 릴레이 구동부를 포함하고,
상기 복수개의 부하선들 중에 특정 릴레이만을 구동시켜 상기 비상전원의 (+), (-) 전원선 사이에 하나의 부하만이 연결된 상태에서 상기 전압, 전류 오차에 대한 에러 판정이 이루어지며, 상기 복수개의 부하선들의 릴레이 전부를 구동시켜 상기 비상전원의 (+), (-) 전원선 사이에 모든 부하들이 연결된 상태에서 용량에러판정이 이루어지는 것을 특징으로 하는 비상전원 성능검사장치. The apparatus of claim 1, wherein the emergency power performance tester includes a plurality of load lines having loads and relays installed between positive and negative power lines of the emergency power, and a relay for receiving the driving signal from the microcomputer to drive the relays. Including a drive unit,
By driving only a specific relay among the plurality of load lines, an error determination for the voltage and current errors is made while only one load is connected between the positive and negative power lines of the emergency power source. Emergency power performance testing device characterized in that the capacity error determination is made in the state that all the load is connected between the (+), (-) power line of the emergency power by driving all of the relay of the load line. 청구항1에서, 상기 용량에러판정은 상기 가변부하를 최저의 임피이던스값으로 유지한 상태에서 이루어지는 것을 특징으로 비상전원 성능검사장치. The emergency power performance tester according to claim 1, wherein the capacitance error determination is performed in a state in which the variable load is maintained at a minimum impedance value.
KR1020120034501A 2012-04-03 2012-04-03 Performance test apparatus of emergency power supply KR101326598B1 (en)

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