KR20050095534A - A watt-hour metering apparatus - Google Patents

A watt-hour metering apparatus Download PDF

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KR20050095534A
KR20050095534A KR1020040099627A KR20040099627A KR20050095534A KR 20050095534 A KR20050095534 A KR 20050095534A KR 1020040099627 A KR1020040099627 A KR 1020040099627A KR 20040099627 A KR20040099627 A KR 20040099627A KR 20050095534 A KR20050095534 A KR 20050095534A
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power
current
metering device
phase
meter
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전명수
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(주)신우디엔시
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • G01R11/02—Constructional details
    • G01R11/17—Compensating for errors; Adjusting or regulating means therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/061—Details of electronic electricity meters

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

본 발명은 전기사업자와 계통연계된 154Kv변압기 중성점이 접지된 수전설비를 보유한 수용가 간에 전기를 송전하거나 반대로 수전 받은 전력량을 정확하게 계량하기 위한 전력계량 장치에 관한 것이다.The present invention relates to a power metering device for accurately metering the amount of power received or vice versa between an electrician and a customer who has a grid-connected 154Kv transformer neutral point grounded faucet facility.

상기와 같이 전기사업자와 수용자 간에 송수전 되는 전력량의 측정을 2 소자 계량장치에 의해 계량된 전력량에 의해 전력요금을 정산하는 경우 상기 2 소자 계량장치는 송수전시 계량되는 전력량이 계량장치의 계량 오차 이외에 계량 방식에 따른 오차가 발생되는 등 문제점이 있어 3소자 계량장치로 전력량 계량방법을 변경하여 오차를 줄이고 있는 것이다.As described above, when the power rate is calculated by the amount of power metered by the two-element metering device, the two-element metering device determines that the amount of power metered at the time of transmission and reception is different from the metering error of the metering device. There is a problem, such as an error caused by the metering method is to reduce the error by changing the power metering method to the three-element metering device.

그러나 2소자 계량장치를 보유하고 있는 수용가의 경우 설비 변경에 따른 막대한 투자비용과 정전 수반에 따른 생산 설비의 가동중단이라는 문제점이 있어 상기 2 소자 계량장치를 보유한 수용가의 경우 중성점 접지선의 영상전류 측정용 저압변류와 송수전시 오차계량용 3상전력량계로 구성된 간단한 장치를 이용하여 상기의 문제점을 개선한 계량 장치에 대한 기술이 공지되어 있으나 상기의 계량장치의 경우 별도로 부속 전력량계를 추가 설치하여야 하고 전력량 검침에 따른 번거로움이 수반되므로 이를 개선하여 기존의 전력량계를 이용하여 정확한 송수전 전력량을 계량할수 있도록 한 장치에 관한 것이다.However, in the case of a customer with a two-element metering device, there is a problem of enormous investment cost due to the change of equipment and the operation of the production equipment due to the power failure. Although a technique for a metering device that improves the above-mentioned problems by using a simple device consisting of a low pressure current transformer and a three-phase meter for error transmission and reception is known, the metering device has to be additionally installed with an additional meter. Since it is accompanied by the hassle according to the present invention relates to a device that can improve the amount of power transmission and transmission using the existing electricity meter.

Description

영상전류 보상용 3상 전력 계량장치{A Watt-Hour metering apparatus}Three-phase power metering device for image current compensation {A Watt-Hour metering apparatus}

본 발명은 영상전류 보상용 3상전력 계량장치에 관한것으로, 더욱 상세하게는 전기사업자와 계통연계된 154Kv 변압기 중성점이 접지된 수전설비를 보유한 수용가 간에 전력을 송전하거나 반대로 수전받을때의 전력량을 정확하게 계량하기 위한 3상전력계량장치에 관한것이다. 종래에는 상기와 같이 전기사업자와 수용가 간에 송수전 되는 전력량은 주로 2대의 변류기와 3대의 계기용 변압기로 구성된 2소자 계량장치에 의해 계량되어 왔었다.The present invention relates to a three-phase power metering device for image current compensation, and more particularly, to accurately calculate the amount of power when electric power is transmitted or vice versa between a grid-connected 154Kv transformer neutral point and a customer having a grounded power receiver. It is about 3-phase power metering device for weighing. In the related art, the amount of electricity transmitted and received between an electric service provider and a consumer has been measured by a two-element metering device mainly composed of two current transformers and three instrument transformers.

그러나 도 1에서와 같이 상기의 2소자 계량장치에 의해 전력량(WⅡ)를 계량해 보면However, when the amount of power (W Ⅱ ) is measured by the two-element metering device as shown in FIG.

역율 100% Cosθ=1의 경우 (이하 전력량의 벡터 표시 도트는 생략) In case of power factor 100% Cosθ = 1 (hereinafter, the vector display dot of the amount of power is omitted)

WⅡ = W1 + W2 W II = W 1 + W 2

= VabIa + VcbIc = V ab I a + V cb I c

= (Va - Vb)Ia + (Vc-Vb)Ic = (V a -V b ) I a + (V c -V b ) I c

= VaIa + VcIC - Vb(Ia + Ic)= V a I a + V c I C -V b (I a + I c )

= VaIa + VcIc + Vb(Ib + In)= V a I a + V c I c + V b (I b + I n )

= (Van + Vn)Ia + (Vcn + Vn)Ic + (V bn + Vn)(Ib + In)= (V an + V n ) I a + (V cn + V n ) I c + (V bn + V n ) (I b + I n )

= (VanIa + VbnIb + VcnIc) + Vn (Ia + Ib + Ic + In)+ VbnIn + VnIn = (V an I a + V bn I b + V cn I c ) + V n (I a + I b + I c + I n ) + V bn I n + V n I n

이 되며 Ia + Ib + Ic = -In 이므로Since I a + I b + I c = -I n

= (VanIa + VbnIb + VcnIc) + Vbn In 이 되기 때문에= (V an I a + V bn I b + V cn I c ) + V bn I n

중성점 접지부하인 경우 실제 전력량 VanIa + VbnIb + Vcn Ic - VnIn 과 비교해 보면 VbnIn + VnIn = VbIn 만큼의 과부족이 발생되는 매우 불합리한 계량오차가 발생되고 있는 것이다.In the case of the neutral ground load, the actual amount of power V an I a + V bn I b + V cn I c -V n I n Compared with V bn I n + V n I n = V b I n Unreasonable weighing errors are occurring.

따라서 본 발명자는 상기와 같은 2 소자 계량장치의 불합리한 점을 개선하고 자 별도의 고가 시설설치나 정전없이도 간단하게 계통연계된 154Kv 변압기 중성점 접지선에 소형의 저압변류기를 설치하여 과부족 전력량을 정확하게 계량하는 장치를 발명하여 실용신안등록 제 20-0305090 호 (2003년 2월 8일자)로 등록받아 상기의 2소자 계량장치의 문제점을 개선 기존의 3소자 계량장치의 계량값과 동일하게 계량되도록 하였으며, 이때 도 2의 기존의 3소자 계량장치에서의 계량전력량(W Ⅲ )과 비교해 보면Therefore, the present inventor is to improve the irrationality of the two-element metering device as described above to install a small low-voltage current transformer to the 154Kv transformer neutral ground line simply connected without a separate expensive facility installation or power outage to accurately measure the excess or insufficient power amount The invention was registered as Utility Model Registration No. 20-0305090 (February 8, 2003) to improve the problem of the two-element metering device to be weighed the same as the conventional metering device of the three-element metering device, Compared with the metering power in the conventional three-element metering device of W (W Ⅲ)

즉 3소자 계량장치의 역율 Cosθ=1인 경우 That is, when the power factor Cosθ = 1 of the three-element metering device

WⅢ = W1 + W2 + W3 W III = W 1 + W 2 + W 3

=VaIa + VbIb + VcIc = V a I a + V b I b + V c I c

=(Van + Vn)Ia + (Vbn + Vn)Ib + (V cn + Vn)Ic = (V an + V n ) I a + (V bn + V n ) I b + (V cn + V n ) I c

=VanIa + VbnIb + VcnIc + Vn(I a + Ib + Ic)가 되고= V an I a + V bn I b + V cn I c + V n (I a + I b + I c )

Ia + Ib + Ic = -In 이므로Since I a + I b + I c = -I n

=VanIa + VbnIb + VcnIc - VnI n 이 되어 실제 계량한 송수전 전력량과 일치하며, 2 소자 계량장치와 3소자 계량장치에 의해 계량되는 전력량을 서로 비교해 보면= V an I a + V bn I b + V cn I c -V n I n, which corresponds to the actual amount of transmission and reception, and compares the amount of power metered by the two- and three-element meters.

WⅡ - WⅢ = [(VanIa + VbnIb + Vcn Ic) + VbnIn] - [VanIa + VbnI b +VcnIc - VnIn] = VbnIn + VnIn 이 되어 VbIn 만큼 발생되는 양 장치간의 차가 발생되는바 이를 보상하기 위해서는 상기 2소자 계량장치에서 발생하는 오차 전력량을 계량하기 위한 과부족 전력량계 와 주계량용 전력량계를 추가로 설치하여야 할뿐아니라 이를 확인하기 위한 별도의 원격검침 설비내지는 현장에 일일히 나가서 검침하여야 하는 문제점이 수반되고 있다는 것이다.W II -W III = [(V an I a + V bn I b + V cn I c ) + V bn I n ]-[V an I a + V bn I b + V cn I c -V n I n = = V bn I n + V n I n , and the difference between the two devices generated by V b I n is generated. To compensate for this, an over-short power meter and a main meter for measuring the error power generated by the two-element metering device In addition to the installation of a power meter, as well as a separate remote metering facility to check this is accompanied by a problem that has to go out and read the site every day.

본 발명은 상기와 같은 문제점을 개선하여 정확한 송수전 전력량을 계량하기 위하여 3상4선식의 주계량용 전력량계와 중성점에 설치한 저압변류기등 기존의 설비를 이용하는 즉 154Kv측에 설치된 2개의 변류기와 중성점의 저압변류기를 이용하여 전자식 전력량계 내부의 연산방식을 수정하여 3소자 계량장치에서와 같이 정확한 전력량을 계량함으로서 오차 전력량을 없애도록한 영상전류 보상용 3상전력 계량장치를 발명하는 것에 그 목적이 있는 것이다.The present invention utilizes existing equipment such as a three-phase four-wire main meter power meter and a low pressure current transformer installed at a neutral point to solve the above problems and accurately measure power transmission and reception, that is, two current transformers and a neutral point installed at the 154Kv side. The purpose of the invention is to invent a three-phase power metering device for image current compensation by eliminating the error power by measuring the exact amount of power as in the three-element metering device by modifying the calculation method inside the electronic power meter using the low voltage current transformer of will be.

상기와 같은 목적을 달성하기 위한 본 발명의 구성은 도 3에 도시된 바와 같이 중성선의 저압변류기(10);와 전기사업자와 수용가 간에 송수전되는 전력량을 각각 계량할수 있는 3상4선식 전력량계(20);와 공지의 변류기(30);및 계기용변압기(40)로 구성되어지며, 본 발명에 의해 송수전 전력량의 계량과정은 도 3에서와 같이 전력선에서 입력되는 A상 C상의 전류 IA IC 와 중성점 접지선에서 입력되는 전류 In을 이용하는 것으로, A상과 C상의 전류 IA와 IC는 실제로 흐르는 전류이나 B상의 전류 IB는 기지의 전류 IA, Ic, In을 이용하여 송수전 전력량을 계량하는 3상4선식 전자식 전력량계의 입력전류 IB 대신 -(IA + Ic + In) 을 이용하여 전력량을 계량하며 중성점 접지선에 설치하는 저압변류기는 소형이므로 전력선에 설치하는 변류기와 변류비가 다르므로 3상4선식 전자식 전력량계 내부에서 연산으로 변류비를 동일하게 하는 기능을 입력할수 있는 것으로 중성점이 접지되어 있는 경우 중성점으로 유입하거나중성점에서 유출하는 전류의 합이 Zero가 되어야 하므로 IA + IB + Ic + In = 0 가 되고The configuration of the present invention for achieving the above object is a three-phase four-wire wattmeter (20) capable of metering the amount of power transmitted and received between the electric service provider and the customer; And a known current transformer 30; and an instrument transformer 40, the metering process of power transmission and reception by the present invention is the current A A phase C phase I A I input from the power line as shown in FIG. The current I n input from C and the neutral ground wire is used.The currents I A and I C of the A and C phases are actually flowing, but the currents I B of the B phase are known using the currents I A , I c , and I n . Instead of the input current I B of the three-phase four-wire electronic watt-hour meter that measures the amount of power before transmission, the power is metered using-(I A + I c + I n ). Current transformer and current transformer ratio are different 3, because the four-wire electronic watt-hour meter that can enter the function of equalizing the sides Ljubica in operation within the neutral point in this case is the ground flows into the neutral point, or the sum of the currents flowing out from the neutral point to be a Zero I A + I B + I c + I n = 0

결과적으로 IB = -(IA + Ic + In)이 되기 때문에 본 발명에 의거 전력량을 계량한 결과에 따르면As a result, since I B =-(I A + I c + I n ), according to the result of measuring the amount of power according to the present invention,

WT = W1 + W2 + W3 W T = W 1 + W 2 + W 3

= VAIA + VBIB + VCIC = V A I A + V B I B + V C I C

= VAIA + VB[ -(IA + Ic + In)] + V cIc = V A I A + V B [-(I A + I c + I n )] + V c I c

= (VAn + Vn)IA + (VBn + Vn)[ -(IA + Ic + In)] + (Vcn - Vn)Ic = (V An + V n ) I A + (V Bn + V n ) [-(I A + I c + I n )] + (V cn -V n ) I c

= VAnIA + VBn[ -(IA + Ic + In)] + VcnIc - VnIn 이 되므로= V An I A + V Bn [-(I A + I c + I n )] + V cn I c -V n I n

IB 를 -(IA + Ic + In )으로 치환하여Substitute I B with-(I A + I c + I n )

WT = W1 + W2 + W3 = VanIa + Vbn Ib + VcnIc - VnIn 이 되어 WⅢ 과 동일한 계량값인 즉 WT = WⅢ 가 되어 Ib 대신에 W T = W 1 + W 2 + W 3 = V an I a + V bn I b + V cn I c - V n I n is the is is in other words W T = W Ⅲ same weight value and W Ⅲ I b Instead of

[ -(IA + Ic + KIn)]로 연산하게 되면 별도로 154Kv측에 대용량 변류기를 추가로 설치하지 않고서도 기존의 A상, C상의 대용량 변류기와 중성점 접지선의 저압 변류기를 이용하여 정확하게 3소자 계량장치에서 계량되는 전력량과 동일한 전력량을 계량할 수가 있는 것이다.If you calculate with [-(I A + I c + KI n )], you can use the existing A phase and C phase large current transformers and the low voltage current transformers of the neutral ground wire without installing a large capacity current transformer on the 154Kv side. It is possible to measure the same amount of power as that of the device metering device.

한편, 중성점 전류는 일반적으로 0.5~ 20 암페어 정도이므로 아래 표1에서 보는 바와 같이 중성선의 변류기를 154Kv측에 사용한 변류비와 동일한 비율로 변류비 보정(K)를 곱해서 입력할수 있도록 함으로서 미세한 중성선의 전류를 154Kv 전력선의 변류비와 동일하게 보정한 다음 154Kv측과 일치시킨다음 정확한 송수전 전력량을 계량할수 있도록 중성점 접지선의 변류비(C/T비) 보정입력이 가능한 3상4선식 전자식 전력량계를 구비 하여야 한다. On the other hand, since the neutral point current is generally about 0.5 to 20 amperes, as shown in Table 1 below, the current of the fine neutral line can be input by multiplying the current ratio correction (K) at the same ratio as the current ratio used for the 154Kv side of the neutral line. Is to be equal to the 154Kv current flow rate of the 154Kv power line, and then matched with the 154Kv side, and a three-phase 4-wire electronic power meter capable of inputting the current-to-current ratio correction (C / T ratio) of the neutral ground line should be provided to measure the exact amount of power before and after do.

(표1) Table 1

구분division 변류비Current ratio 비율ratio 변류비보정Current ratio correction 보정된 변류비Corrected Current Ratio 154Kv측중성선154Kv side neutral 300/510/5300/510/5 602602 -30-30 60606060

종래의 개선된 2소자 계량장치에서 발생되고 있는 계량방식에 의한 오차를 없애므로서 3소자 계량장치에서 계량한 전력량 값과 일치시킬수가 있기 때문에 별도로 고가의 대용량 변압기의 설치나 상기 변류기의 설치에 따른 정전 등과 같은 문제점을 해소할수 가 있을뿐아니라 중성점 접지선에 흐르는 미세전류를 직접 검출해서 기존의 3상 4선식 전력량계를 활용하기 때문에 전기 사업자와 수용가 간에 계량방식에 의한 전력량 오차 없이 정확하게 계량이 가능한 새로운 발명인 것이다. By eliminating the error caused by the conventional two-element metering device, it is possible to match the amount of power measured by the three-element metering device. Not only can it solve the problem such as power failure, but it also detects the micro current flowing through the neutral ground line and utilizes the existing three-phase 4-wire electricity meter, so that the new inventor can accurately measure the electricity without any error of electricity by the metering method. will be.

도 1은 종래의 2소자 계량장치가 설치된 구성도1 is a block diagram of a conventional two-element metering device is installed

도 2는 종래의 3소자 계량장치가 설치된 구성도2 is a block diagram of a conventional three-element metering device is installed

도 3은 본 발명에 의한 계량장치 설치된 구성도Figure 3 is a configuration diagram installed metering apparatus according to the present invention

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10: 저압변류기 20: 3상4선식 전력량계10: low current transformer 20: three-phase four-wire power meter

30: 변류기(CT) 40: 계기용 변압기(PT)30: Current transformer (CT) 40: Instrument transformer (PT)

Claims (3)

2대의 변류기 (CT)와 3대의 계기용 변압기 (PT)로 구성된 2소자 계량장치에 의해 송수전 전력량을 계량함에 있어 In measuring the amount of power before transmission by two element metering device composed of two current transformers (CT) and three instrument transformers (PT) 계통연계된 154Kv의 중성점을 접지한 수전 설비에서 송수전 되는 전력량을 정확한 계량을 하기 위하여 저압용 변류기(10);와 송수전 되는 전력량을 계량하기 위한 3상4선식 전자식 전력량계(20);와 변류기(30); 및 계기용 변압기(40)로 구성되며, 3상4선식 전자식 전력량계(20)는 154Kv 전력선에 흐르는 전류 IA, Ic와 중성점 접지선에 흐르는 전류 In을 이용해서 3상4선식 전자식 전력량계와 저압용 변류기(10)에 흐르는 미세 전류를 검출해서 변류비를 보정하여 154Kv 측 변류비와 일치시킨 다음 B상 전류 Ib 대신 -(Ia + Ic + KIn)을 이용하여 송수전 전력량을 계량하는 것을 특징으로하는 영상전류 보상용 3상전력 계량장치Low-voltage current transformer 10 to accurately measure the amount of power transmitted and received in the grid-connected 154Kv neutral point power receiving facility; and a three-phase four-wire electronic electricity meter 20 for measuring the amount of power transmitted and received; 30; And a transformer 40 for the instrument, the three-phase four-wire electronic wattmeter 20 uses a current I A , I c flowing through a 154Kv power line and a current I n flowing through a neutral ground wire and a low voltage. Detects the minute current flowing through the current transformer 10 and corrects the current ratio to match the current ratio of 154Kv side, and then measures the amount of power before transmission using-(I a + I c + KI n ) instead of the B phase current I b. 3-phase power meter for image current compensation, characterized in that 제 1항에 있어서 저압변류기(10)의 1차 전류 측은 계통연계된 154Kv의 중성점을 접지한 접지선과 전기적으로 연결되어 있으며, 2차전류측은 수전 계량용 3상 전력량계의 특정단자 및 송전계량용 전력량계의 특정단자와 전기적으로 연결되어 있는 것을 특징으로 하는 영상전류 보상용 3상전력 계량장치.According to claim 1, the primary current side of the low-voltage transformer 10 is electrically connected to the ground wire grounded to the grid-connected 154Kv neutral point, the secondary current side is a specific terminal of the three-phase power meter for power metering and power meter for power transmission meter Three-phase power metering device for image current compensation characterized in that it is electrically connected to a specific terminal of the. 제 1항에 있어서 수전전력 계량용 3상전력량계와 송전전력계량용 3상전력량계는 상호 특정단자와 상호 전기적으로 연결되어 있으며 상기 상호 특정단자는 변류기와 계기용 변압기와 전기적으로 연결되어 있는 것을 특징으로 하는 영상전류 보상용 3상 전력계량장치The three-phase meter for power reception and the three-phase meter for power transmission power are electrically connected to each other and the mutually connected terminals are electrically connected to a current transformer and an instrument transformer. 3-phase power meter for image current compensation
KR1020040099627A 2004-12-01 2004-12-01 A watt-hour metering apparatus KR20050095534A (en)

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KR101041166B1 (en) * 2009-07-08 2011-06-13 전명수 Appratus and method for measuring electric power
WO2012020857A1 (en) * 2010-08-11 2012-02-16 Jun Myung Soo Apparatus and method for measuring electric power
CN103399184A (en) * 2013-08-05 2013-11-20 国家电网公司 Joint junction box convenient for adjusting phase sequence
CN105259381A (en) * 2015-10-28 2016-01-20 江苏省电力公司常州供电公司 Portable active electric energy metering device
KR20170038454A (en) * 2015-09-30 2017-04-07 한국전력공사 Metering system using three-phase three-wire system for neutral grounding customer
CN110426668A (en) * 2019-08-05 2019-11-08 广州供电局有限公司 Measuring equipment test platform based on Container Reconstruction
WO2020094866A1 (en) * 2018-11-09 2020-05-14 Phoenix Contact Gmbh & Co.Kg Measuring device and method for measuring electrical variables in a three-phase alternating current network

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101041166B1 (en) * 2009-07-08 2011-06-13 전명수 Appratus and method for measuring electric power
WO2012020857A1 (en) * 2010-08-11 2012-02-16 Jun Myung Soo Apparatus and method for measuring electric power
CN103399184A (en) * 2013-08-05 2013-11-20 国家电网公司 Joint junction box convenient for adjusting phase sequence
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CN105259381A (en) * 2015-10-28 2016-01-20 江苏省电力公司常州供电公司 Portable active electric energy metering device
CN105259381B (en) * 2015-10-28 2017-05-10 江苏省电力公司常州供电公司 Portable active electric energy metering device
WO2020094866A1 (en) * 2018-11-09 2020-05-14 Phoenix Contact Gmbh & Co.Kg Measuring device and method for measuring electrical variables in a three-phase alternating current network
CN110426668A (en) * 2019-08-05 2019-11-08 广州供电局有限公司 Measuring equipment test platform based on Container Reconstruction
CN110426668B (en) * 2019-08-05 2024-03-01 广东电网有限责任公司广州供电局 Metering equipment test platform based on container transformation

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