Device and method for testing delay characteristics of secondary signal transmission system in digital substation

A secondary signal and transmission system technology, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems of inability to detect the jitter performance of the transmission system, and the absolute delay test results are not accurate enough, so as to facilitate the measurement and reading delay. Time, simple and accurate response, weakening the effect of the request
CN103777104BActive Publication Date: 2016-11-23STATE GRID CORP OF CHINA +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2016-11-23

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Abstract

The invention provides a time-delay characteristic testing device and method of a digital substation secondary signal transmission system. The time-delay characteristic of the digital substation secondary signal transmission system, namely any node between output of a merging unit and an intelligent electric device, can be tested. According to the time-delay characteristic testing device and method, an Ethernet interface and an optical fiber interface are compatible, a time-delay test signal with periodically-changed amplitude and the stable frequency is generated through a three-phase controllable amplitude modulation power source, the cyclic wave position is calibrated through the amplitude, and interference of whole cyclic wave time delay in a time-delay test is eliminated; a self-generating synchronous clock signal is adopted, strict synchronization of inner sampling and signal circuit sampling is guaranteed, and the time-delay characteristic detecting accuracy is guaranteed; the corresponding relation between an inner sampling point and a signal circuit sampling point is determined through window comparison, the time difference of the corresponding sampling points is computed in a compared mode to obtain time-delay characteristic information, and transmission time difference shaking information of a system can be reflected.
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Description

technical field

[0001] The invention relates to the technical field of electric power detection, in particular to a device and method for testing delay characteristics of a secondary signal transmission system of a digital substation. Background technique

[0002] Digital substation refers to the digitization of the information collection, transmission, processing and output process of the substation. The basic features are intelligent equipment, communication network, unified model and communication protocol, and automatic operation management. The analog signal of the power grid is sampled into a digital signal through the electronic transformer, and the information is summarized through the merging unit. According to the IEC61850-9-1 / 2 standard, the digital signal containing the electrical quantity is transmitted in the Ethernet frame format, through the switch and the Ethernet The network transmits information to devices such as relay protection equipment and station con...

Claims

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