Influence of Negative Phase Sequence of Distribution Line to Feeder Terminal Unit Operation

2018 ◽  
Author(s):  
Zeng Xianfeng ◽  
Hou Wei ◽  
Wang Jie ◽  
Wang Xiaoxiang ◽  
Li Yuqi
Keyword(s):  
Negative Phase ◽  
Unit Operation ◽  
Terminal Unit ◽  
Phase Sequence ◽  
Feeder Terminal Unit ◽  
Distribution Line

scholarly journals Research on the Device Design for Calculation Distribution Line Loss Based on Dynamic Three-phase Unbalance Degree

2019 ◽  
Vol 118 ◽  
pp. 02071
Author(s):  
Meifang Wei ◽  
Jing Yang ◽  
Xuhua Zeng ◽  
Haiyan Wu ◽  
Di Huang
Keyword(s):  
Real Time ◽  
Distribution Network ◽  
Wireless Transmission ◽  
Loss Calculation ◽  
Sequence Identification ◽  
Phase Sequence ◽  
Three Phase ◽  
Time Calculation ◽  
Distribution Line ◽  
Line Loss

For the power distribution network line loss calculation, there are some problems, such as backward method, long calculation period, large workload and poor real-time performance. To this end, this paper proposes a real-time calculation method for distribution line loss based on dynamic three-phase unbalance, and a hardware device system with unbalanced phase sequence identification function, three-phase unbalance detection function and line loss real-time calculation function has been developed. The system uses a master-slave design based on the principle of wireless transmission. The slave collects standard three-phase current signals and transmits them to the host through wireless transmission. The host is installed on the low voltage side of the transformer in the transformer region, and the current signal of the transformer region is collected in real time. Unbalanced phase sequence identification, unbalance calculation, and line loss calculation based on dynamic unbalance are performed by comparing the current signals collected by the master and the slave. The above algorithm implementation process can be displayed online in real time. In addition to the core data processing and waveform display functions, the device also includes a battery power supply and management system, a signal storage and transmission system, and temperature measurement, and overcurrent and overvoltage protection. The test results of the device show that the device has the characteristics of convenient carrying, fast detection of three-phase unbalance, and accurate calculation of line loss. The device can monitor the running status of the distribution network transformer region in real time.

Analysis the Reason of Head and Tail Pully Driving and Bidirectional Motor Negative Phase Sequence over Current Protection Malfunction

2011 ◽  
Vol 130-134 ◽  
pp. 2800-2804
Author(s):  
Rong Chun Yang ◽  
Lloyd Edwards ◽  
Feng Hua Gao
Keyword(s):  
Negative Phase ◽  
Reverse Direction ◽  
Phase Sequence ◽  
Sampling Program ◽  
Solution Methods

Analysis the wiring of head and tail pully driving & bidirectional 6KV motor，and found the reason of negative phase sequence over current protection malfunction did occur when the motor ran in the reverse direction , then compared the solution methods to make sure which one is better. At last use the method that change the sampling program to make the motor negative phase sequence over current protection wil in effect.

Application of IEC61850-80-1 in Peer-to-Peer Communication between Feeder Terminal Units

2012 ◽  
Vol 614-615 ◽  
pp. 1401-1404
Author(s):  
Qing Hua Shao ◽  
Xiao Li Wang ◽  
Bing Liu ◽  
Zhong Hua Yan ◽  
Ping Jiang
Keyword(s):  
Data Model ◽  
Information Exchange ◽  
Automatic System ◽  
Information Model ◽  
Peer To Peer ◽  
Peer Communication ◽  
Time Performance ◽  
Terminal Unit ◽  
Feeder Terminal Unit ◽  
Long Time

The trend towards using IEC61850 standards in feeder terminal unit (FTU) design is inexorable, but at present in China, IEC60870-5-104 is mostly used in distribution automatic system (DAS) information exchange. Thus it can be seen that IEC61850 standard will coexist with IEC60870-5 standard for a long time. IEC61850-80-1 provides the method of exchanging information from IEC61850 CDC-based data model using IEC60870-5-101 or IEC60870-5-104. This paper makes a brief analysis on the structure of DAS based on IEC61850, proposes the information model of FTU in accordance to IEC61850 and maps the information model to IEC60870-5-104 using IEC61850-80-1, which takes the advantage of IEC60870-5-104’s excellent real-time performance to realize peer-to-peer communication between FTUs.

Harmonization of Feeder Terminal Unit Information Model Based on IEC 61850 and IEC 61968/61970

2013 ◽  
Vol 411-414 ◽  
pp. 1787-1790
Author(s):  
Guo Zheng Han
Keyword(s):  
Information Model ◽  
Measurement Information ◽  
Iec 61850 ◽  
Common Information ◽  
Terminal Unit ◽  
Remote Terminal ◽  
Feeder Terminal Unit ◽  
Remote Terminal Unit ◽  
The Status ◽  
Common Information Model

The feeder terminal unit (FTU) is a kind of distribution remote terminal unit along distribution feeders and communication with master stations (MS) in control centre. IEC 61970/61968/61850 are three important standard for smart grid. IEC 61850 logical nodes are used for FTUs information model, and IEC 61970/61968 common information model (CIM) are using in MS. To realizing seamless access FTUs to MS, harmonization of IEC 61850 and IEC 61968/61970 are studied. The status information (such as position of switch) and measurement information (such as current, voltage) are realizing mapping from IEC 61850 to IEC 61968/61970. So, the seamless communication between the master station and FTU is realized.

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