According to the wiring of ct and pt , and internal wiring of protection device , this thesis introduces the method to prevent the mix - connect and proves its correctness through testing 根据电流互感器和电压互感器的接线方法与保护装置内部接线情况，介绍了交流二次回路正确接线方法，验证接线正确的试验方法。
The paper introduces the protective equipment ' s allocation and utilization principle of the zhuzhou smelter ' s power capacitor on main circuit and quadratic circuit , and aslo expounds that the mutual cooperation of each protective equipment is very important 摘要文章介绍了株冶供电厂电力电容器主回路及二次回路上的保护装置的配置及运用原理，阐明了各种保护之间相互配合的重要性。
Rsj820 insulation monitoring device of the secondary ac circuit can prevent this problem effectively , and improve the security and stability of the power network . the product fills the gap in insulated monitoring of the secondary ac circuit in power system 本文研制的rsj820二次交流回路绝缘监测装置能有效的防止二次交流回路发生多点接地，提高了电网的安全与稳定，填补了电网二次回路缺乏绝缘监测的空白。
Because the pt secondary loop voltage drop directly affects the accuracy of the electric energy measurement . after consulting a great amount of materials , the best method to reduce the pt secondary loop voltage drop was put forward based on analyzing the cause of which 由于电压互感器二次回路压降直接影响电能量计量的准确性，严重时会危及电力系统的稳定运行，因此本文从分析电压互感器二次压降的形成机理入手，并提出最为合理的二次压降治理方案。
On - line monitoring of hvcb is the precondition of predicting maintenance , is the key element of reliable run , and is the important supplement to the traditional off - line preventive maintenance in fact , the faults are made by hvcb , no matter in number or in times , is over 60 % of total faults so it has determinative importance for improving the reliability of power supply and this can greatly decrease the capital waste used by - dating overhaul in this paper , the inspecting way of hvcb mechanism characteristic is discussed the concept of sub - circuit protector is presented , the scheme that we offered has been combined with sub - circuit integrality monitoring theory , to ensure that it has the two functions as a whole according the shut - off times at rated short circuit given by hvcb manufacturer , the electricity longevity loss can be calculated in each operation , and the remained longevity can be forecast too an indirect way for calculating main touch ' s temperature by using breaker shell temperature , air circumference temperature and breaker ' s heat resistance is improved in this paper , and main touch resistance can be calculated if providing the load current msp430 , a new single chip microcomputer made by ti company , is engaged to develop the hardware system of the on - line monitoring device , and special problem brought by the lower supply voltage range of this chip is considered fully 高压断路器所造成的事故无论是在次数，还是在事故所造成的停电时间上都占据总量60以上。因此，及时了解断路器的工作状态对提高供电可靠性有决定性意义；并可以大大减少盲目定期检修带来的资金浪费。本文论述了断路器机械特性参数监测方法；提出了二次回路保护器的概念，并将跳、合闸线圈完整性监视和二次回路保护结合起来，给出具有完整性监视功能的二次回路保护器实现方案；根据断路器生产厂家提供的断路器额定短路电流分断次数，计算每次分闸对应的触头电寿命损耗，预测触头电寿命；提出根据断路器壳体温度和断路器周围空气温度结合断路器热阻来计算断路器主触头稳态温升的方法，并根据此时的负荷电流间接计算主触头回路的电阻；在硬件电路设计上，采用美国ti公司最新推出的一种功能强大的单片机msp430 ，并充分考虑该芯片的适用电压范围给设计带来的特殊问题；在通信模块的设计中，解决了不同工作电压芯片之间的接口问题，并给出了直接联接的接线方案。
The pt secondary loop voltage drop is a changing amount and has the characteristics of indirection and certain randomness . the second , according to the cause of pt secondary loop voltage drop , the different methods to reduce the pt secondary loop voltage drop were analyzed and the conclusions are draw as below : 1 . changing bigger section wire and maintaining the connector plugs regularly can reduce the pt secondary loop voltage drop effectively , but ca n ' t guarantee which meets the relevant rules 首先，通过对电压互感器二次压降的形成机理进行分析，得出以下关于二次压降的相关结论： 1 、电压互感器二次压降等于二次回路阻抗和回路电流的乘积； 2 、电压互感器二次回路阻抗分为元器件自身阻抗和接触阻抗两部分，且接触阻抗占主要部分，从而使得电压互感器二次回路阻抗具有动态特性，而且具有一定的随机性； 3 、电压互感器二次回路电流与二次负荷和回路阻抗大小相关，因而二次回路电流也是变化的； 4 、电压互感器二次压降是一个变化量，且具有单向性和一定的随机性。
