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Merging unit transient state test system based on accurate discrete time control

A test system, discrete time technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., to meet real-time requirements and achieve the effect of real-time testing

Active Publication Date: 2014-06-18
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0005]The purpose of this invention is to solve the test requirements of intelligent substations and digital substations on the delay characteristics and time jitter characteristics of the merging unit under transient conditions, And in view of the current technical status of the existing merging unit application, a transient test system based on the precise time discrete test of the merging unit based on the digital transfer of analog quantities has been developed to meet the requirements of the relay protection of the power system for the time of the merging unit of the smart substation under fault conditions. characteristic test

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[0020] The merging unit transient test system based on precise discrete time control in the embodiment of the present invention consists of a main CPU, an analog quantity acquisition board, an analog quantity conversion module, an FPGA-controlled message detection module, a constant temperature crystal oscillator, and a transient analog quantity acquisition front-end and Composition of upper computer.

[0021] Among them, the FPGA uses Xilinx's Spartan3 series product XC3S1500 to realize the reception of the Ethernet sampling value and FT3 sampling value of the merging unit MU. The FPGA is also based on the above-mentioned constant temperature crystal oscillator to perform accurate time calibration for each sampling value. FPGA has good timing control capabilities The time jitter of the receiving link can be controlled at the nanosecond level.

[0022] Adopt MPC8247 embedded microprocessor of Freescale Company, this processor belongs to PowerQUICC II series, includes a core ba...

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Abstract

A merging unit transient state test system based on accurate discrete time control comprises an upper computer, an analog quantity acquisition card, an analog quantity conversion module, a main CPU (central processing unit), a message detection module controlled by an FPGA (field programmable gate array), a constant temperature crystal oscillator and a transient state analog quantity acquisition device. Aiming at the current technical situation of merging unit application, the transient state test system which is based on analog quantity digitization transmission and is used for performing merging unit accurate time discrete test is developed, so as to meet time response test on a merging unit of an intelligent transformer substation in case of fault for power system relay protection; by adopting transient state-stable state integrated design, the test system not only supports transient state test but also supports stable state test; the test system can accurately test digital quantity transient state accuracy of the merging unit based on discrete data transmission when analog quantity is input, and a detection basis is provided for widely popularizing the intelligent transformer substation.

Description

[0001] technical field [0002] The invention relates to a time characteristic test system for a relay protection device of an intelligent substation when it is connected to an analog quantity merging unit for input, and belongs to the field of relay protection verification of an intelligent substation in a power system. Background technique [0003] At present, the development of smart substations and digital substations has entered the stage of large-scale engineering applications. With the extensive application of electronic transformers, traditional transformers + merging unit models, the merging unit will officially become smart equipment for smart substations and digital substations. With the release of State Grid Corporation of China Q / GDW441-2010 "Smart Substation Relay Protection Technical Specifications", time-based merging units have also been widely used in smart substations. Among them, the delay characteristics of merging units and SMV message time The jitte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 舒展邹进谢国强余侃胜熊丽霞
Owner STATE GRID CORP OF CHINA
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