Method for performing calibration time delay error testing on time delay calibration switch of intelligent substation

Abstract

The invention discloses a method for performing calibration time delay error testing on a time delay calibration switch of an intelligent substation. The method comprises the following steps: performing special processing on a transmitting port SV (Sampling Value) message; after the time delay calibration switch receives the SV message, calculating a time delay value from the entrance of the message into a receiving port to the transmission of the message from another port, and filling the time delay value into a reserved field of the SV message; receiving and filtering a specific SV message by the receiving port, and locking a first bit time scale of a received first frame message; calculating a measured time delay value; solving the received SV message, and extracting a switch time delay value calibrated in the reserved field of the SV message; and calculating the difference between the measured time delay value and the calibrated time delay value. The calibrated SV time delay error of the switch can be measured conveniently, so that the performance of the switch can be evaluated, and the reliability of interpolation synchronization on the SV message received by a relay protection device can be ensured. Moreover, a parameter setting process is simple; the requirement on the knowledge level of testing personnel is lowered; and the testing efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of intelligent substation testing, and in particular relates to a method for testing delay error calibration of an intelligent substation delay calibration switch. Background technique [0002] At this stage, the sampling value (SV) data collection of intelligent substation protection devices generally adopts the "direct sampling" mode, and the SV message follows the IEC61850-9-2 protocol. The merging unit (MU) is connected to the protection device by point-to-point optical fiber. The advantage of this mode is that the SV data synchronization of the protection device in the entire substation does not depend on the external clock system, and only needs to ensure that the transmission delay of the SV message from sampling to MU output is fixed. It is known that, under this premise, the protection device can use an interpolation algorithm to realize SV synchronization between different MUs. However, the disadv...

AI Technical Summary

Problems solved by technology

In addition, the traditional delay test method does not analyze the received message, does not read the delay calibration value in the IEC61850-9-2SV message, therefore, it is impossible to measure the delay calibration error of the delay calibration switch

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