Transmission Line Address Overlap Detection in Substation Systems
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Solution Overview
Problem
Conventional systems for detecting disconnection in line reduction systems cannot accurately confirm true responses from substations and are prone to address overlap issues, leading to data delivery failures due to incorrect address settings.
Innovation Solution
A transmission line address overlap detection system that uses a common data signal line with a main station and substations, employing a management data area and control/monitoring data area within pulsed signals to accurately detect address settings and overlaps by generating and comparing random number data, allowing for address adjustment and disconnection detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a command system with address data is used for data transmission between main station and substations, then data can be routed to specific substations, but transmission efficiency is degraded when address data is significant relative to the amount of data to be transmitted
Solution Approach 1:
The data transmission is segmented into two distinct phases: a synchronization phase where address information is transmitted separately, and a data phase where actual data is transmitted. This segmentation allows the address data to be transmitted once for multiple data packets, reducing the relative overhead of address information and improving overall transmission efficiency.
2Reliability
If conventional disconnection detection methods are used in transmission synchronization systems, then line disconnection can be detected, but address overlap between substations cannot be detected leading to data delivery failures
Solution Approach 1:
The system implements a feedback mechanism where each substation transmits its address information back to the main station during the synchronization phase. The main station compares the received address information with the expected address based on the transmission clock cycle, providing feedback to detect both disconnections and address overlaps. This feedback loop ensures both disconnection detection capability and address setting accuracy.
3Ease of operation
If address information is transmitted with each data packet, then specific substations can be targeted, but transmission efficiency is reduced due to repeated address data
Solution Approach 1:
The system performs preliminary transmission of address information during the synchronization phase before the actual data transmission. This preliminary action establishes the addressing context for subsequent data packets, allowing targeted data transmission to specific substations without repeating the address information in each data packet, thereby maintaining both targeting capability and transmission efficiency.
Data Source
AI summary
A management data area including a plurality of pulsed signals is provided in a series of pulsed signals outputted from the main station to the common data signal line, the area being different from a control/monitoring data area including data of a control data signal and data of a monitoring data signal. The substation sets random number data generated by its own station as an original number, generates pieces of comparison/collation data having a plurality of bits based on the original number, and superimposes a signal including the pieces of comparison/collation data on the management data area. The main station determines existence of address overlap of the substations based on a result of comparing the pieces of comparison/collation data complying with a predetermined rule.