End-to-end transmission delay measurement method and system for low-voltage power distribution network

Abstract

The invention discloses an end-to-end transmission delay measurement method and system for a low-voltage distribution network, and the method comprises the steps that an upper layer transmits a measurement signal to a first microprocessor A1 through a power line and a first power line carrier communication module A3, and the first microprocessor A1 starts a measurement process after receiving themeasurement signal; and a first time signal K1 generated by the first programmable device A2 is transmitted through a first spread spectrum signal transmitter A4. A programmable device records the time t1 at the moment, after the first programmable device A2 receives a second time signal and carries out related operation processing, the time t2 is recorded, and transmission delay t<transmission>=(t2-t1-t<processing>-t<sending duration>) / 2, wherein the t<processing> is the time spent in processing various digital signals and is a determined value, the t<sending duration> is the time when the first time signal and the second time signal are transmitted through the spread spectrum signal, is related to the sequence length of K1 and K2 and the data transmission rate and is also a determined value, and thus a determined time delay result is obtained.

Description

technical field [0001] The invention relates to the field of delay measurement, in particular to a method and system for end-to-end transmission delay measurement of a low power distribution network. Background technique [0002] There are three main types of existing transmission delay measurement systems: the first type is a communication-based end-to-end network transmission delay test system, the second type is a transmission delay measurement system based on pulse reflection, and the third type is global satellite positioning system [0003] The first type of system is mainly used in computer network communication end-to-end creation delay test and wireless communication network end-to-end transmission delay test. During delay measurement, the measurement direction sends a data packet to the measured party, and the measured party returns a response packet after receiving the data packet. The measuring party records the time when the data packet is sent and the time wh...

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Problems solved by technology

[0007] In the existing second type of system, the radar technology cannot be directly applied to the end-to-end transmission delay measurement of the power line network; the technology in the vector network analyzer must require that the two ends of the cable under test can be placed at the same place, which is obviously not applicable The power line network where each terminal is located in different geographical locations; the network cable length tester, cable length tester and optical fiber length tester require that one end of the cable and optical fiber to be tested must be disconnected from the system, and there is only one reflected signal, while a typical power line network, there are multiple branch switches and terminals, and each branch switch and terminal will cause impedance discontinuity, which will generate reflected signals and cause measurement failure. At the same time, it is impossible to measure the end-to-end transmission delay in the power line network grid disconnected

[0008] The existing third type of technology requires the system to have a unified high-precision time of the entire network. The high-precision clock is large in size and high in cost, and cannot be embedded in electrical equipment that is sensitive to cost, volume, and power consumption, so it is not applicable Measurement of end-to-end transmission delay in power line network

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