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Change in selection philosophy of shunt line reactor allows Eskom to realize perpetual economic benefits

机译：分流线反应器的选择哲学的变化允许Eskom实现永久的经济效益

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Dire economic constraints calls for innovation aimed at reducing the financial impact of institutions, this impact has since forced Eskom to strategically execute strategic capital and refurbishment projects, and in some cases halted indefinitely. In light of the current financial constraints that Eskom faces, the team of engineers, mentioned, proposed a philosophy change which provides the business with a perpetual savings vehicle in terms of initial capital and operating costs, further benefits will be mentioned later on in this paper. This paper focuses on the overhead transmission line system, line end equipment, and specifically deals with an innovation in the selection philosophy of shunt line reactors; this philosophy has been documented as an official National Eskom Guideline which is currently being used to quantify the need of shunt line reactors. The line end equipment evaluated when constructing the philosophy was the current transformer, capacitive voltage transformer, surge arrester, line trap and line reactor. A sensitivity analysis was done taking in to account the latest equipment specifications in order to determine which of the mentioned line end equipment was the most vulnerable during a Ferranti voltage rise. Once the rated limiting piece of equipment was proven, we realized that a new line end voltage limit could be established. This new voltage limit, greater than the previous limit used in Eskom; meant that we would now only introduce shunt line reactors at a higher line end voltage as compared to in the past. This new line end voltage was selected and accepted taking in to cognisance the temporary overvoltage (TOV) capabilities of all the line end equipment mentioned. Other than the initial monetary benefits mentioned earlier this philosophy provides the following: 1. It will introduce less reactive sinking devices in to the transmission network which in turn will help reduce the restriction on the surge load impedance (SIL) on a line, meaning more useable power can be transmitted on that line and this could negate the need for future lines being built. 2. Generators will be de-loaded as they do not need to provide extra reactive power to compensate for the shunt line reactors when they are not needed. 3. Fewer reactors will mean increased reliability within substations as there is one less piece of equipment to operate or fail. The mentioned Guide has saved Eskom the potential need for the installation of line reactors on the future Matimba - Marang and the Matimba - Ngwedi 400 kV lines which translates in to an approximate saving of R 200 million.
机译：可怕的经济限制要求创新旨在减少机构的财务影响，这一影响已被迫强迫战略执行战略资本和翻新项目，并且在某些情况下无限期停止。鉴于当前的财务限制，埃斯基摩人，提到的工程师团队提出了一种哲学变革，这些哲学变化在初始资本和运营成本方面为业务提供了永久储蓄车辆，在本文后面将提到进一步的福利。本文侧重于顶置传输线系统，线路设备，并专门处理分流线反应堆的选择哲学中的创新;这一哲学已被记录为官方国家ESKOM指南，目前正在用于量化分流线路反应堆的需求。在构建哲学时评估的线路端设备是电流变压器，电容电压变压器，电涌避雷器，线阱和线路反应堆。完成了敏感性分析，以考虑到最新的设备规范，以确定在法兰蒂电压升高期间的最易受伤害的线路端设备。一旦经过验证的额定限制设备，我们意识到可以建立新的线路端电压限制。这种新的电压限制，大于ESKOM中使用的前一个限制;意味着与过去相比，我们现在只能以更高的线路端电压引入分流线反应器。选择并接受该新的线路终端电压，以认识到所提到的所有线路设备的临时过压（TOV）功能。除了前面提到的初始货币福利之外，这种理念提供了以下内容：1。它将引入更少的反应性沉降装置进入传输网络，反过来将有助于减少对线上的浪涌负载阻抗（SIL）的限制，意思是更多可在该行上传输可用电源，这可能会否定建立未来线路的需求。 2.发电机将被拆进，因为它们不需要提供额外的无功功率，以补偿当它们不需要时的分流线反应器。 3.更少的反应堆意味着在变电站内的可靠性提高，因为有一块操作或失败的设备。提到的指南已保存了ESKOM在未来Matimba - Marang和Matimba - Ngwedi 400 kV线上安装线路反应器的潜在需求，这转化为r200万的近似节省。

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