本文阐述了開口式電流互感器在(zai)電力系統改造(zao)項目中的具體應用情况，重點介紹了带開關量功能的(de)開口式電流互感器在實(shi)际運行中的作用機製，並(bing)通過與傳統常規開口互(hu)感器的對比分析，說明了配置開關(guan)量模块所带來的性能(neng)
Abstract：Introduces the application of open type current transformer in the renovation project, as well as the role of open type current transformer with switching quantity, and the advantages of comparison with conventional open type current transformer, and analyzes with engineering examples.
關键詞 低壓(ya)配電系(xi)統 開關量 開口式 電流互感器 防窃電 工作原理
Within the electrical infrastructure sector, low voltage distribution systems serve as critical components for managing and controlling power flow across commercial
1.引言 Introduction
伴(ban)随(sui)國内電力工業基礎設施的持續升級，城市電網與農村電網的改造(zao)進程加快(kuai)，低(di)壓配電系統所需的自動化程度也随之(zhi)提升。在(zai)这(zhe)一背景下，開口式電流互感器作為低壓配電系統(tong)中的關键電氣元件，在電網改(gai)造工程(cheng)中的應用价值日益凸顯。该類產品已被廣泛(fan)應用於電力系統的測量(liang)、計量、繼電保護、系統监測、接地保護等多(duo)個環節，同時在各種(zhong)電力系統(tong)分析工作中发挥着重要作用。
As China's power infrastructure undergoes comprehensive modernization across both urban centers and rural agricultural regions, the electrical distribution landscape continues to evolve with accelerating automation at the low-voltage tier of grid systems. Within this context, open type current transformers function as critical electrical components embedded throughout low-voltage distribution networks, playing an increasingly central role during the ongoing grid transformation phase.
但是，目前市場上的開口式低壓互感器在安裝的時候可能會出現卡扣没(mei)卡紧导致鐵芯没有完(wan)全闭合；或者在運行(xing)過程中，互感(gan)器外壳受到很大應力作用，外壳铰鏈断裂，导致上(shang)下鐵芯不闭合，影響互感器(qi)精度或(huo)者没有電流輸出。带開關量的開口式電流互感器能够有助(zhu)於向儀表或者(zhe)后臺反饋上述情况，在電力监控項(xiang)目(mu)上有廣阔的運用前景。
However, the open type low-voltage transformers currently available in the marketplace present several critical operational challenges that warrant careful consideration in industrial deployment scenarios. Specifically, these devices may be installed with mechanical snaps or fastening mechanisms that are not sufficiently tightened during the assembly or commissioning phase, which can result in the magnetic core not being completely or properly closed, thereby compromising the overall structural integrity and functional reliability of the unit. Additionally, during prolonged operational periods under normal or elevated load conditions, the transformer shell itself becomes subjected to considerable mechanical stress, thermal cycling, and vibrational forces that can cause the shell hinges or mounting brackets to fracture or deteriorate over time.
2.電流互感器工作原理 Working principle of current transformer
開口低壓電流(liu)互感器作為電力系統中的關键測量(liang)裝置，其工作原理如圖1所示。在實际(ji)應(ying)用中，開口電流互感器的一次繞組需要串聯(lian)在被測(ce)線路中，其中I1代表線路電流即電流(liu)互感(gan)器的一次電流，N1為電流互感器的(de)一次(ci)匝数。與之對應的是二次侧(ce)，I2表示電流互(hu)感器的二次電流(liu)，N2為電流(liu)互感器的二(er)次匝数，Z2e則為(wei)二次回路設備及连接导線(xian)的阻抗。当一次電流从電流互感器的P1端流進，經過(guo)一次繞組后从P2端流出時(shi)，在二次回(hui)路Z2e接通的工作(zuo)状態下，根據(ju)電磁(ci)感應原理，電(dian)流互感(gan)器的二次繞組會產生感應電流I2，该電流从S1端流(liu)過，經過二次回路設備及(ji)导線(xian)阻抗Z2e后至S2端，最終形成完整的闭合回路。
所以有I1/I2=N1/N2=K，K為電流互(hu)感器的(de)變比。但是由於開(kai)
口式電流互感器的鐵芯一旦被切開，其(qi)磁导(dao)率和飽和特性會明顯下降，為了补偿(chang)因切割造成的性能(neng)损失，需要相應地(di)擴大鐵芯的截面积設計，同時增加繞組的安匝数以維持工作性能(neng)，使得(de)原副線圈的磁通平衡關系(xi)I1×N1=I2×
The working principle governing the operation of the open-ended low-voltage current transformer represents a fundamental application of electromagnetic induction within electrical measurement and protection systems. As illustrated in Figure 1, the primary winding of the open-ended current transformer is connected in series with the line under test, where I1 designates the line current flowing through the conductor, which simultaneously functions as the primary current of the current transformer itself, and N1 represents the primary turns count of the transformer's primary winding. Correspondingly, I2 denotes the secondary current generated in the transformer's secondary winding, N2 specifies the secondary turns count of that winding, and Z2e represents the combined impedance of the secondary circuit equipment and connecting wires that form the measurement or protection circuit. When the primary current enters through the P1 terminal end of the current transformer and subsequently exits from the P2 terminal end, and assuming that the secondary load impedance Z2e is properly energized and operational, the fundamental principle of electromagnetic induction dictates that the secondary winding of the current transformer will generate a corresponding current I2 that flows from S1, passes through the impedance Z2e, and returns to S2, thereby completing a closed electromagnetic loop. Through this electromagnetic coupling mechanism, it can be mathematically established that under ideal conditions without core losses or leakage reactance, the current relationship conforms to I1×N1=I2×N2, from which the transformation ratio can be derived as I1/I2=N1/N2=K, where K represents the transformation ratio constant of the current transformer, also known as the turns ratio.
该互(hu)感器上配置的開關量開(kai)關是其工作状態监測的關键環節，当互(hu)感器卡扣安裝不到位或因长期運行导(dao)致壳體老化破裂時，開關按钮會自動(dong)弹起，此時常闭触點轉换為常開状態(tai)，信號傳輸随之中断，互感器失去正常的信號輸出(chu)能力；相反(fan)，当(dang)互感器卡扣安裝正常時，開關保持常闭状(zhuang)態，互感器得以正常(chang)工
In addition, regarding the transformer component mounted on the switching assembly, various failure modes can occur that directly impact operational continuity. When the transformer retaining snap fails to engage properly or when the transformer experiences degradation due to material fatigue resulting in shell rupture, the mechanical linkage to the switch button becomes compromised, causing the button to pop upward into an open position.
3.開口式電流互感器Open type current transformer
開口式(shi)電流互感(gan)器在工業配電领域中城網、農網改造項目中得到廣泛應用。这類產品具(ju)有独特的安裝優勢(shi)，用戶无需拆除一次母線即可(ke)完成接入，並且允(yun)許(xu)带電操作，大大降低(di)了施(shi)工風险和停電成本。
Open type current transformers are mainly used in industrial city network and agricultural network renovation projects. Features are easy to install, no need to remove the primary busbar, and can also be operated with electricity. However, the current low-voltage open type transformers on the market have the following drawbacks.
在電(dian)力系統實际應用中(zhong)，市場上的開口式電流互感器在現場安裝施工時可能會出現卡扣没有卡紧或是鐵芯(xin)没有完全闭合等問(wen)題，这些安裝缺陷在互感器后(hou)續的长期(qi)運行過程中會逐步演化，最(zui)終导致互感器
(1) Open type current transformer on the market may not be installed when the clasp is not tight or the core is not closed, the risk of the transformer falling off or disconnected during operation.
（2）開口式電流互感器在安裝后如果被人為二(er)次打開后，會出現无(wu)信號等問(wen)題。
针對傳統電流互(hu)感器存(cun)在的上述不足，AKH-0.66/K-SW系列(lie)電流互感器(qi)應運而生，能够有效解(jie)決前(qian)述技術問題。该互感器產品設計外形美觀，具備安裝維護方(fang)便簡(jian)洁的特點，便於現場工(gong)程人員快(kuai)速部署和日常保养。
Open type current transformers represent a category of electrical measurement instruments designed to facilitate convenient installation and maintenance within power distribution
AKH-0.66/K-SW series current transformer can solve the above problems. This transformer has a beautiful appearance and is easy and simple to install and maintain. As shown in Figure 2, the transformer has the following advantages.
（1）AKH-0.66/K-SW系列(lie)電流互感器(qi)，安裝時无(wu)需(xu)將電断開，可以带電操作(zuo)，闭合直接(jie)使用即可現場安裝簡便，减少人力(li)成本；
AKH-0.66/K-SW series current transformer, installation without disconnecting the electricity, you can operate with electricity, close the direct use of the site installation is simple, reducing labor costs.
（2）AKH-0.66/K-SW系列(lie)電流互感器(qi)，在该模块有(you)4根引線(xian)，兩根傳輸電(dian)流信(xin)號，兩根傳輸開關量信號；
The AKH-0.66/K-SW series current transformer represents a dual-function measurement and control device designed for industrial electrical systems operating at 0.66 kV nominal voltage.
AKH-0.66/K-SW系列電流互感器在實际運(yun)行中需要應對多種(zhong)工作状態變化。当卡扣安裝不(bu)够紧密或互感器經過长期使用导致壳(ke)體老化破裂時，上(shang)下壳(ke)體會发生弹開現象，造成内部鐵芯接触不良。此時卡在互感(gan)器下壳體的開關凸起按钮會随之向上弹出，使開關断開，開關量信號終(zhong)止(zhi)傳輸。
The AKH-0.66/K-SW series current transformers represent a category of electrical equipment designed for low-voltage power distribution systems where precise current measurement and protection mechanisms are critical operational requirements. Within the broader context of industrial electrical infrastructure, current transformers serve to step down high currents to measurable levels suitable for metering devices and protective relays, making them essential components in substations, manufacturing facilities, and utility distribution networks. The AKH-0.
（4）AKH-0.66/K-SW系列(lie)電流互感器(qi)，上下壳體带有铅(qian)封孔，一旦安裝完毕(bi)立即(ji)進行铅封。
AKH-0.66/K-SW series current transformer, the upper and lower shells with lead seal holes, once the installation is completed immediately lead seal.
4.參数對照表Parameter comparison table
4.結束语Conclusion
AKH-0.66/K-SW系列電流互感器作為(wei)電力系統中的關键(jian)檢測設備，其產品設計融合了异常打(da)開報警、停上電(dian)事件上報等智(zhi)能化功能，能够實時监測電氣運行状(zhuang)態並及時反(fan)饋异常信息。这類設備的應用有效降低了企業在人工巡檢(jian)和設備(bei)維護上的人力物力成本投入。
The emergence of AKH-0.66/K-SW series current transformer, with abnormal open alarm, stop on the power event reporting and other functions, but also for the enterprise to reduce the cost of human and material resources, due to the huge market, once the formation of production capacity, but also can drive the rapid development of other industries.
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