Phase Wiring Detection Using Relay Segmentation
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Solution Overview
Problem
Existing methods for detecting the wiring phase of an unknown phase voltage in poly phase power distribution systems are limited by the need for a direct communication channel, which is often unavailable, and suffer from signal noise issues due to the electrical characteristics of power lines, especially at larger distances.
Innovation Solution
The method involves using relay locations to relay phase relation information between a reference location and a remote location, allowing phase detection without a direct communication channel by transmitting time stamp signals and measuring time intervals between reference points in the power line, enabling phase relation determination across multiple relay locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct communication channel is used to detect phase voltage at a remote location, then phase detection can be performed, but the method is limited by the availability of such a channel and cannot work at larger distances
Solution Approach 1:
The patent divides the detection path into segments by introducing relay locations between the reference location and the remote location. Each relay detects the phase relation between itself and its neighbor, and these segmented phase relation information is combined to determine the total phase relation, enabling detection over larger distances without requiring a direct communication channel.
Solution Approach 2:
The relay locations act as intermediaries that facilitate phase detection across distances where direct communication is unavailable. Each relay receives phase relation information from its reference side and transmits it to its remote side, serving as a mediator that bridges the gap and enables indirect phase detection.
2Length of moving object
If power line communication is used to transmit signals over long distances, then communication range is extended, but signal noise increases and signal to noise ratio becomes unacceptably low
Solution Approach 1:
The patent segments the long communication path into shorter segments between adjacent relay locations. Each segment transmits only phase relation information (time interval data) rather than continuous communication signals, reducing the accumulation of noise over distance while maintaining communication capability across the entire network.
Solution Approach 2:
The patent extracts only the essential phase relation information (time interval between reference points) from the power line communication and transmits this condensed data between relays. By taking out only the necessary information rather than transmitting full communication signals, the system reduces noise interference while maintaining detection accuracy.
3Reliability
If a telephone connection is used to establish communication between reference and remote devices, then phase detection can be performed, but the system requires separate communication infrastructure which is often unavailable
Solution Approach 1:
The patent makes the power line itself serve multiple functions: it continues to deliver electrical power while simultaneously being used as the communication medium for transmitting phase relation information. This eliminates the need for separate telephone connections or other communication infrastructure, reducing system complexity while maintaining detection capability.
Solution Approach 2:
The power line distribution system serves itself by using its existing conductors to carry both power and communication signals. The relays detect phase relations by measuring time intervals between reference points on the power line, allowing the system to perform phase detection without requiring external communication infrastructure.
Data Source
AI summary
The technology relates to detecting the wiring phase of an unknown phase voltage relative to a reference phase voltage in an electric power distribution system having a polyphase power line. In order to reliably detect the wiring phase at the remote location relative to a reference wiring phase even if the remote location is at a larger distance from the reference location, at least one relay location is arranged between the reference location and the remote location and connected to the wiring phase of the polyphase power line. A first phase relation is detected between the reference wiring phase voltage at the reference location and the wiring phase voltage at the relay location. A second phase relation is detected between the wiring phase voltage at the relay location and the wiring phase voltage at the remote location. The wiring phase of the remote location relative to the wiring phase at the reference location is detected based on the first phase relation and the second phase relation. The technology is advantageous in that a direct communication channel between the remote location and the reference location for detecting the phase relation is not required.