Fault Protection Device Ground Trip Delay Bypass

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Solution Overview

Problem

Fault protection devices in power distribution systems often incorrectly trip due to bypass operations, leading to unnecessary outages and requiring manual intervention to prevent false trips during maintenance or repair, which can be hazardous for technicians.

Innovation Solution

A reclosing fault protection device with a ground trip delay feature that automatically recognizes partial bypass configurations and enters a modified operating state to prevent false tripping, allowing for safe maintenance and operation by delaying ground trip responses during bypass procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual ground trip blocking is implemented, then false tripping during bypass is prevented, but operational complexity and safety risks increase

Engineering Contradiction:

Improvefalse trip preventionVSAvoidmanual intervention requirement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The fault protection device automatically detects bypass operations and self-adjusts its tripping characteristics without requiring manual intervention. The device monitors its own operational state and autonomously transitions between immediate and delayed ground trip modes based on whether a bypass is detected. This self-service capability eliminates the need for technicians to manually block ground trip, reducing operational complexity and safety risks while maintaining false trip prevention.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The device incorporates feedback mechanisms that monitor operational parameters to detect bypass conditions. Based on this feedback, the device automatically adjusts its ground trip response. The feedback loop enables the device to recognize bypass operations and respond appropriately by extending ground trip time, thereby preventing false tripping without requiring external manual control.

Inventive Principle:

Principle #23Feedback

2Speed

If immediate ground trip response is used, then fault isolation speed is improved, but false tripping during bypass operations increases

Engineering Contradiction:

Improvefault isolation speedVSAvoidfalse tripping during bypass

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The ground trip response time is dynamically adjusted based on operational state. During normal operation, the device provides immediate ground trip response for rapid fault isolation. During bypass operations, the device automatically extends the ground trip time to prevent false tripping. This dynamic response allows the system to maintain fast fault isolation capability while avoiding false tripping during bypass by adapting the response time to current conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The time parameter of ground trip response is changed based on operational context. Under normal conditions, ground trip time is set to immediate response for fast fault isolation. During bypass operations, the ground trip time parameter is extended to a delayed response. This parameter change enables the device to maintain high speed fault isolation capability while preventing false tripping during bypass operations.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11611204B2Fault protection device with ground trip delay and method

Publication Date: 2023.03.21 S&C ELECTRIC CO

AI summary

A reclosing fault protection device detects a partial bypass state. Upon detecting the partial bypass state, the fault protection device implements a ground trip delay operating state. The ground trip delay operating state provides a delayed ground trip response characteristic.