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Zhang J.,North China Electrical Power University | Xu Z.,North China Electrical Power University | Yang Q.,North China Electrical Power University | Su Z.,Wuhu Power Supply Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

Digital distance relay based on line RL model algorithm is firstly developed successfully in China, which has been used widely for high-voltage transmission line protection. However, it has some limits in being directly used for series compensated line. Thus, a new improved RL model based single-phase ground fault location algorithm for series compensated line is proposed. It is well considered of the effect of non-linear MOV and compensated capacitor on actual reactance of transmission line. Compared with conventional fault location algorithm for series compensated line, it does not need to identify whether SC/MOV is in fault loop, and not need to know the parameters and the operating states of SC/MOV/GAP. Simulation results with EMTDC/PSCAD and Matlab show that the proposed algorithm can obtain more accurate results than conventional fault location algorithms for series compensated transmission lines. ©, 2015, Power System Protection and Control Press. All right reserved. Source


Chu F.,Shanghai University of Electric Power | Ye L.,Wuhu Power Supply Company | Zhang J.,Shanghai University of Electric Power | Yang B.,Shanghai University of Electric Power | And 3 more authors.
Applied Mechanics and Materials | Year: 2011

A nitro aromatic explosives sensor based on fluorescence quenching was studied in this paper. U-shaped plastic optical fiber was used as sensor head and light emitting conjugated polymer MEH-PPV as fluorescence indictor. The light source was modulated sinusoidal to eliminate the external light disturbance. TNT quenching characteristics of fluorescence intensity were measured; When TNT concentration was lower than 10mg/ml, the relationship between fluorescence intensity and TNT concentration was linearly, when TNT concentration was higher than 10mg/100ml the obtained characteristics showed deviation from linear relation described by Stern-Volmer equation. © (2011) Trans Tech Publications, Switzerland. Source


Wang R.-X.,NARI Group | Lin Q.-Y.,Wuhu Power Supply Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

This paper mainly designs the communication procedures between Heilongjiang Ethernet IEC103 protocol and Qiqihaer power plant subsystem. First, the different points between Heilongjiang Ethernet 103 protocol and other IEC103 protocol are introduced and the real communication network on spot project is discussed. By using TPC communication designs of the communication connection modules, substation configuration modules, setting transmission modules, wave file transmission modules, etc, the transmission credibility of the communication data in Heilongjiang PRFIS subsystem including measurement, signal, setting value, wave data file (*. Hdr, *.cfg, *. dat) is guaranteed. Finally, it is indicated that the compressing and encrypting data transmission of Heilongjiang Ethernet IEC103 protocol can be conducted by users themselves and the protocol data analysis in substation functional level can also be done personally. Source


Zhang J.H.,North China Electrical Power University | Xu Z.Y.,North China Electrical Power University | Su Z.P.,Wuhu Power Supply Company
Advanced Materials Research | Year: 2014

The distance relays of transmission lines find limitations in the presence of series compensated capacitor. One of them is the distance relay setting issue, in which either over-reach problem or under-reach problem may occur. To deal with this issue, a differential equation based adaptive distance relaying setting method for series compensated line is proposed. As for it do not need to identify whether SC/MOV is in fault loop, not need to know the parameters and the operating states of SC/MOV/GAP, and furthermore, it can be realized without the iterative calculation, it is very suitable to be used for the distance relaying adaptive setting of series compensated line. Simple simulation results certificate the proposed adaptive setting method. © (2014) Trans Tech Publications, Switzerland. Source


Wang L.,Qianxinan Nationality Vocational and Technical College | Lin Q.-Y.,Wuhu Power Supply Company | Hong C.,Wuhu Power Supply Company | Pang Y.,Wuhu Power Supply Company | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

To improve the voltage quality, optimize reactive distribution and decrease losses in the region electric network, a voltage/reactive power linkage and coordinated control system for city and county electric power is developed. The system dynamically sends gateway reactive directives to country voltage and reactive control system when city reactive capacity is not enough, which depends on residuary reactive in the country electric network to compensate the reactive vacancy of city electric network in time. Considering city's 220 kV substations actual gateway reactive value and combining the province gateway reactive directives sent to city, this paper decides the gateway reactive value sending to country voltage and reactive control system, and illuminates the scheme to realize voltage and reactive linkage and coordinated control for regional electric network. Practical operation shows that the system is conducive to improving the voltage level, promote the rational distribution of reactive power, and decrease the loss of regional power grid, bringing economic and social benefits for power supply enterprises. Source

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