Y. Hirata, K. Sasaki, M. Takahashi, H. Aizawa, H. Takeda, Y. Ishida, N. Nosaka, T. Sakai
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引用次数: 3
摘要
我们利用法拉第效应将大型光电流互感器(OCT)商业化,用于北海道-本州高压直流线路电缆头站的电缆保护。直流额定电流为±1200a,额定电压为±250kv。OCT的传感头直径约为2米,不仅适用于新建的电缆头,也适用于现有的电缆头,而无需拆卸电缆头套管。OCT在Furukawa电缆头站进行了一年多的现场测试,并证实了其长期稳定性。在现场测试中,环境温度在-15℃到27℃之间变化。将OCT测量的初级电流与kramer型DCCT测量的初级电流进行比较,数据一致。根据现场测试结果,我们制造了用于商业安装的OCT。进行了用于商业安装的OCT的工厂测试。比值误差、频率响应和其他试验结果均满足其标准。特别是,我们精确地测量了温度特性,并确认了整个系统在任何环境温度下的比例误差,包括色散,都满足要求的规范,相当于IEC 60044-8 class 1.0。
Application of an optical current transformer for cable head station of Hokkaido-Honshu HVDC link
We commercialized a large-size optical current transformer (OCT) using the Faraday effect for the Cable Head Station of Hokkaido-Honshu HVDC Link for cable protection. The rated current and voltage of the HVDC are ±1200 A and ±250 kV, respectively. The diameter of the sensing head of the OCT is about 2 m and it is applicable not only to newly constructed cable heads but also to existing cable heads without disassembling a cable head bushing. The field test of the OCT was conducted at Furukawa Cable Head Station for more than one year and we confirmed long-term stability. In the field test, ambient temperature changed in the range from -15degC to 27degC. Primary current measured by the OCT was compared to that measured by a Kraemer-type DCCT, and the data were consistent. Reflecting the field test results, we manufactured the OCT for commercial installation. Factory tests of the OCT for commercial installation were conducted. Ratio error, frequency response, and the results of other tests satisfied their criteria. In particular, we measured temperature characteristics precisely and confirmed that the ratio error of the total system at any ambient temperature, including dispersion, satisfied the required specification, which is equivalent to IEC 60044-8 class 1.0.