Compartmental Transformer Layout for Energized Maintenance Access

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Solution Overview

Problem

Conventional compartmental transformers require maintenance personnel to handle high voltages, posing safety risks and necessitating costly de-energization, as equipment for maintenance is typically located inside High Voltage (HV) and Low Voltage (LV) compartments, especially when voltages exceed 480 V ac.

Innovation Solution

Incorporating a separate maintenance compartment remote from the HV and LV compartments, allowing for the placement of maintenance devices such as gauges, valves, and switches, enabling safe and efficient maintenance while the transformer remains energized, by securing and collocating these devices in compartments with voltages below the primary or secondary levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If maintenance equipment is located inside HV and LV compartments, then maintenance personnel can access all necessary equipment, but personnel are exposed to high voltage hazards and safety risks increase

Engineering Contradiction:

Improveaccess to maintenance equipmentVSAvoidhigh voltage exposure risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The transformer is divided into functionally separate compartments: HV compartment for high voltage equipment, LV compartment for low voltage equipment, and a dedicated maintenance compartment for maintenance equipment. This segmentation allows maintenance personnel to access necessary tools in a safe, isolated environment without exposure to high voltage hazards.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Maintenance equipment is extracted from the HV and LV compartments and placed in a separate, dedicated maintenance compartment. This extraction removes the harmful high voltage environment from the maintenance operation area while preserving access to all necessary maintenance tools and gauges.

Inventive Principle:

Principle #2Taking out (Extraction)

2Object-affected harmful factors

If transformer is de-energized for maintenance, then personnel safety is improved, but transformer availability decreases and operational costs increase

Engineering Contradiction:

Improvepersonnel safetyVSAvoidtransformer availability

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

A dedicated maintenance compartment serves as an intermediary space that allows maintenance personnel to service the transformer while it remains energized. The compartment provides a safe, isolated environment that mediates between the need for continuous operation and the need for maintenance activities.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The transformer can remain energized and continue providing power during maintenance operations. The dedicated maintenance compartment enables continuous useful action by allowing maintenance personnel to work on the energized transformer without requiring shutdown, thus maintaining operational continuity.

Inventive Principle:

Principle #20Continuity of useful action

3Object-affected harmful factors

If safety equipment is required for high voltage maintenance, then personnel protection is improved, but maintenance complexity and cost increase

Engineering Contradiction:

Improvepersonnel protectionVSAvoidmaintenance procedure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Maintenance equipment and gauges are extracted from the high voltage environment and placed in a dedicated maintenance compartment with lower voltage. This eliminates the need for complex safety equipment such as HV gloves, hot sticks, and rubber blankets, simplifying the maintenance procedure while maintaining personnel protection.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The maintenance compartment contains duplicate or equivalent maintenance equipment and gauges that can service the transformer without requiring direct access to high voltage components. This copying approach allows maintenance to be performed with simpler, safer equipment.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS7636233B2Multi-compartmental transformer and methods of maintenance therefor

Publication Date: 2009.12.22 COMMONWEALTH EDISON CO

AI summary

A compartmental transformer and a method maintenance therefore is provided. The transformer includes a first compartment housing first equipment electrically coupled to the high voltage side of the transformer and a second compartment housing second equipment electrically coupled with the low voltage side of the transformer. The transformer further includes a maintenance compartment, separate from the first and second compartments, for housing a plurality of maintenance devices used for servicing the transformer while the transformer is energized. The method includes co-locating and securing preventative maintenance devices in one secured compartment remote from a voltage at or above a level corresponding to the lower of the voltages of the primary or secondary sides of the transformer, maintaining the transformer in an energized state, opening the secured compartment, and performing preventative maintenance tasks on respective preventative maintenance devices while the transformer is maintained in the energized state.