Page 77 - 电力与能源2023年第二期
P. 77
第 44 卷 第 2 期 电力与能源
2023 年 4 月 171
DOI:10.11973/dlyny202302015
基于低压台区负线损的电流互感器
计量误差影响分析
卢霄依
(国网上海市电力公司市北供电公司,上海 200072)
摘 要:线损率是供电企业的一个重要经济指标,它不仅反映了配电网的运行管理水平,而且直接关系到企业
的经济效益。某公司对低压台区异常线损实施了排摸,找出了一些共性问题,并通过换总表、查关联、检查错
接线等消缺手段处理了异常线损,但是发现某些台区并不存在变户不匹配或接线错误等问题,仍连续出现负
线损(低于−1%),并且这些台区同时伴有台变负载率低、供电量少的现象。考虑到供电侧计量异常很可能导
致该现象,选取典型台区对电流互感器的计量准确性进行了测试,发现存在较大偏差。对电流互感器的测试
情况以及电流互感器计量误差对台区线损率的影响进行了相应的分析。
关键词:低压台区;负线损;电流互感器;计量误差;降损分析
作者简介:卢霄依(1992—),女,工程师,主要从事电力市场营销。
中图分类号:TM73 文献标志码:A 文章编号:2095-1256(2023)02-0171-04
Influence Analysis of Current Transformer Measurement Error Based on
Negative Line Loss in Low Voltage Station Area
LU Xiaoyi
(State Grid Shibei Power Supply Company,SMEPC,Shanghai 200072,China)
Abstract:Line loss ratio is an important economic index of power supply enterprises,which not only reflects the
operation and management level of distribution network,but also directly relates to the economic benefits of enter‑
prises. our company has carried out a survey of abnormal line loss in the low-voltage station area,found out some
common problems,and also dealt with abnormal line loss by changing the master electricity meters,checking the
correlation,checking the wrong connection and other means of problem elimination. However,it is found that
some station areas do not have problems such as unmatched switching or wiring errors,but continuously have
negative line loss (less than − 1%),and these stations are accompanied by low switching load rate and low
power supply. Considering that abnormal metering on the power supply side may cause the above phenomena,the
measurement accuracy of the current transformer (TA)is tested in a typical station area,and a large deviation is
found. This paper analyzes the test situation of TA and the influence of the measurement error of current trans‑
former on the line loss ratio of the station area.
Key words:low voltage station area,negative line loss,current transformer,measurement error,loss reduction
analysis
对于电力部门来说,电力系统计量是需要重 备的标准化、小型化,还可用来隔开高电压系统,
点关注的。目前,电力系统中广泛采用的是电磁 以保证人身和设备的安全。
式电流互感器 (简称电流互感器或流变)。电流 本文介绍电流互感器的工作原理及结构,通
互感器的工作原理和变压器相似,但其使用方法 过现场测试技术 [1] 分析电流互感器对电能计量
与变压器完全不同。电流互感器将大电流按比 的影响及电能计量产生误差的原因,可为后续低
例 变 换 成 标 准 小 电 流(5 A 或 10 A,均 指 额 定 压台区负线损消缺工作提供思路,以便实现降损
值),以便实现测量仪表、保护设备及自动控制设 目标。

