Differential Protection Interface Sharing for Multi-Object Monitoring

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Solution Overview

Problem

Existing differential protection systems for electrical energy supply networks require dedicated physical communication interfaces for each object to be protected, leading to increased complexity and costs, especially when monitoring multiple objects, as they need to manage measurement value transfers between multiple ends and ensure deterministic data transfer.

Innovation Solution

A differential protection device that uses a single physical communication interface to transmit measurement values for multiple objects, with logical interfaces mapped onto this physical interface, allowing for efficient data transfer and automatic device recognition and configuration, reducing the need for multiple dedicated transfer paths and interfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dedicated physical communication interfaces are provided for each object to be protected, then reliable data transfer is ensured, but device complexity and costs increase

Engineering Contradiction:

Improvedata transfer reliabilityVSAvoidnumber of physical interfaces

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Multiple dedicated physical communication interfaces are merged into a single shared physical interface. The patent combines the functions of multiple separate interfaces (one for each monitored object) into one common physical interface that handles communication for all objects, thereby reducing the total number of physical interfaces while maintaining communication reliability through logical separation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

A single physical communication interface is designed to serve multiple functions by monitoring multiple different objects simultaneously. The interface becomes universal, handling data transfer for various monitored objects through logical interface abstraction, eliminating the need for dedicated interfaces for each object.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of time

If multiple dedicated physical interfaces are used for monitoring multiple objects, then data transfer determinism is maintained, but system costs increase

Engineering Contradiction:

Improvedata transfer time determinismVSAvoidsystem configuration complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The system segments communication into logical interfaces that are mapped onto a shared physical interface. Each monitored object gets its own logical interface with dedicated communication parameters, while physically sharing the same interface. This segmentation maintains deterministic timing for each object's data transfer while avoiding the complexity of multiple physical interfaces.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A communication management unit acts as an intermediary between multiple monitored objects and the single physical interface. This mediator allocates communication resources, manages data transfer timing, and ensures deterministic performance for each object without requiring separate physical interfaces, thereby reducing system complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If separate differential protection devices are arranged at each end of monitored objects, then fault detection accuracy is improved, but the number of devices and interfaces increases

Engineering Contradiction:

Improvefault detection accuracyVSAvoidnumber of protection devices

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple differential protection devices that would traditionally be separate are merged into a single integrated protection device. This device monitors multiple objects simultaneously using a single physical communication interface, maintaining the ability to detect faults in each object accurately while reducing the total number of protection devices required.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11909194B2Differential protection device and protection system for monitoring objects to be protected in a power supply network

Publication Date: 2024.02.20 SIEMENS AG

AI summary

A differential protection device monitors a first object to be protected in an electrical energy supply network. The differential protection device has a measuring unit configured to acquire measurement values at one end of the first object to be protected, a communication unit configured to exchange measurement values with a differential protection device arranged at another end of the first object to be protected, the communication unit has a physical interface for transmitting and receiving the measurement values, and an evaluation unit configured to form a differential value and to generate a fault signal indicating a fault with regard to the first object to be protected if the differential value exceeds a predefined threshold value. Ideally, the differential protection device is configured to monitor further objects to be protected and to exchange respective further measurement values with regard to each further object to be protected.