The paper intfoduces a PC-DSP based real-time digital simulator which is portable in size and aimed at the closed-loop testing of various types of protective relays for their design and application. The simulator can ...The paper intfoduces a PC-DSP based real-time digital simulator which is portable in size and aimed at the closed-loop testing of various types of protective relays for their design and application. The simulator can be widely used in not only concerning utilities but also manufacturers and research / certification institutes because of its many functions. The hardware architecture and software implementation of the simulator are described. The main features and functions of the simulator are also展开更多
In order to provide a novel and more effective alternative to the commonly used relay protection testing device that outputs only the sinusoidal testing signals, the concept of fault waveform regenerator is proposed i...In order to provide a novel and more effective alternative to the commonly used relay protection testing device that outputs only the sinusoidal testing signals, the concept of fault waveform regenerator is proposed in this paper, together with its hardware structure and software flow chart. Fault waveform regenerator mainly depends on its power amplifiers (PAs) to regenerate the fault waveforms recorded by digital fault recorder (DFR). To counteract the PA’s inherent nonlinear distortions, a digital closed-loop modification technique that is different from the predistortion technique is conceived. And the experimental results verify the effectiveness of the fault waveform regenerator based on the digital closed-loop modification technique.展开更多
Intelligent substations adopt various kinds of new technologies, including information sharing technology based on IEC61850, digital sampling technology, synchronization technology, and network transmission technology...Intelligent substations adopt various kinds of new technologies, including information sharing technology based on IEC61850, digital sampling technology, synchronization technology, and network transmission technology. Relay protection equipment faces all the challenges brought by the application of these new technologies. After analyzing the demand for test, the authors propose testing methods and technical requirements targeting the test items in great need, including ICD model file test, digital interface performance test, coordination performance test with merging unit and smart terminal, network pressure test. And the problems occurring during the tests are summarized.展开更多
相比传统电力通信网络,EPON网络能够更好地满足智能变电站通信系统要求,但是智能变电站过程层网络采用EPON技术也存在安全性、可靠性、实时性的问题,导致继电保护存在拒动的风险。针对上述问题提出了改进措施,并进行了基于EPON网络下继...相比传统电力通信网络,EPON网络能够更好地满足智能变电站通信系统要求,但是智能变电站过程层网络采用EPON技术也存在安全性、可靠性、实时性的问题,导致继电保护存在拒动的风险。针对上述问题提出了改进措施,并进行了基于EPON网络下继电保护功能的适应性研究。通过搭建基于EPON网络的智能变电站过程层继电保护动模测试平台,重点选取220 k V智能变电站的母线保护、变压器保护、线路保护为研究及测试对象,进行动模试验。试验结果表明,各类保护装置、合并单元及智能终端可通过EPON过程层通信网络实现设备间采样报文及跳闸报文的信号传输,保护装置动作性能未受影响。展开更多
文摘The paper intfoduces a PC-DSP based real-time digital simulator which is portable in size and aimed at the closed-loop testing of various types of protective relays for their design and application. The simulator can be widely used in not only concerning utilities but also manufacturers and research / certification institutes because of its many functions. The hardware architecture and software implementation of the simulator are described. The main features and functions of the simulator are also
文摘In order to provide a novel and more effective alternative to the commonly used relay protection testing device that outputs only the sinusoidal testing signals, the concept of fault waveform regenerator is proposed in this paper, together with its hardware structure and software flow chart. Fault waveform regenerator mainly depends on its power amplifiers (PAs) to regenerate the fault waveforms recorded by digital fault recorder (DFR). To counteract the PA’s inherent nonlinear distortions, a digital closed-loop modification technique that is different from the predistortion technique is conceived. And the experimental results verify the effectiveness of the fault waveform regenerator based on the digital closed-loop modification technique.
文摘Intelligent substations adopt various kinds of new technologies, including information sharing technology based on IEC61850, digital sampling technology, synchronization technology, and network transmission technology. Relay protection equipment faces all the challenges brought by the application of these new technologies. After analyzing the demand for test, the authors propose testing methods and technical requirements targeting the test items in great need, including ICD model file test, digital interface performance test, coordination performance test with merging unit and smart terminal, network pressure test. And the problems occurring during the tests are summarized.
文摘相比传统电力通信网络,EPON网络能够更好地满足智能变电站通信系统要求,但是智能变电站过程层网络采用EPON技术也存在安全性、可靠性、实时性的问题,导致继电保护存在拒动的风险。针对上述问题提出了改进措施,并进行了基于EPON网络下继电保护功能的适应性研究。通过搭建基于EPON网络的智能变电站过程层继电保护动模测试平台,重点选取220 k V智能变电站的母线保护、变压器保护、线路保护为研究及测试对象,进行动模试验。试验结果表明,各类保护装置、合并单元及智能终端可通过EPON过程层通信网络实现设备间采样报文及跳闸报文的信号传输,保护装置动作性能未受影响。
