在电网建设和改造过程中,随着环境问题的日益突出,做好水土保持工作十分重要.为提高监测精度,实现对水土保持工作的全自动监测,在原输变电工程水土保持监测系统的基础上,采用光敏测钎技术替代原有的测钎技术,实现电力自供,提高稳定性、可靠性和准确性.以陕西—湖北特高压直流输电工程为例,利用光敏测钎研究了其土壤侵蚀,结果表明,该设备的稳定性和精度较好,能够满足输电工程水土保持监测的需要.

为了环保,同时解决SF6高压电器设备在低温下可靠运行的问题,研制和应用SF6/N2混合气体的电器设备是非常必要的.而同样压力下的SF6所占比例越高,其密度越大,绝缘能力越强,但节能减排的意义就越小,因此需要研制SF6/N2混合气体密度继电器,用于监测其气体密度,从而既确保高压电器设备安全运行,又能达到较好的节能减排效果.文中提出研制高性能的SF6/N2混合气体密度继电器,并阐述了高性能的SF6/N2混合气体密度继电器的实现方法,以及通过性能测试,证实该SF6/N2混合气体密度继电器具有较好的性能.

为确保电网设备状态检修及隐患排查工作的顺利进行,带电检测在设备运行维护中的应用目前已被列为各项工作开展的重点.对当前在电网设备运行维护中广泛使用的红外检测、紫外成像检测、超声波检测、超高频检测、暂态地电压法检测、谐波电场法检测、化学成分分析等检测技术的原理及适用范围分别进行了归纳和总结,可为后续从事电网带电检测工作的技术人员提供了参考.

Through the analysis of soil erosion characteristics of power transmission construction project during construction in Xi'an plains as well as projects the relation between project constniction and soil & water conservation,the paper proposes several soil & water conservation measures to reduce the soil erosion in power grid construction and protect the ecological environment,and also provides a scientific basis and foundation for building the database of the soil erosion assessing.

According to the characteristics of electrified railway traction station,a kind of electrified railway power quality monitoring system based on GPRS wireless communication technique is designed.The whole system is composed of power quality monitoring terminal units with C8051F040 SCM and SIM100 GPRS module as the core and monitor host composition.With the use of GPRS wireless communication and Internet access function,the system can realize real time data collection and data transmission for the power quality monitoring system.For the system,the characteristics of wide scope,small maintenance amount and low cost can well satisfied the requirements of the electrified railway power quality monitoring.

When the outer semiconductor layer of XLPE cable winding is invaded by lightning wave,the transient voltage distribution on the core wire and outer semiconductor layer of the double layers of XLPE cable winding is different from the single layer.The transient voltage with certain amplitude on the outer semiconductor layer of the cable winding would be measured because of the special characteristics of the double layers of cable winding structure,which is very different with the transient characteristics of traditional transformer winding under the invasion of the lightning wave.The transient characteristic of the XLPE cable winding is analyzed by measuring the transient voltage on the core wire and outer semiconducting layer,which can provide a basis for the design and lightning protection technologies for the new type transformer.

This paper introduces the working principle,composition structure of DC circuit breaker used in HVDC engineering as well as its technical difficulties in interrupting course,makes a review on the allocation principle as well as operation mode of the DC circuit breaker in bipolar converter station for UHVDC transmission project,and gives a prospect that the DC circuit breaker may be used in the UHVDC project.

In the light of the earth flashover fault in interior of miniaturization breaker in Shaanxi grid in recently years,combined with the correlative notes when the fault occurs,the relevant test after the fault and the disassembly inspection for fault breaker,this paper analyzes the main causes of the fault and proposes the corresponding preventive measures.