Three-Lead Surge Protector for HVAC Ring-Wave Compliance

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Solution Overview

Problem

HVAC systems' components, such as condensing units and air handlers, are vulnerable to transient surges, which existing surge protection devices often fail to adequately protect, leading to non-compliance with industry standards like IEEE Standard C62.41.2, resulting in costly upgrades or component replacements.

Innovation Solution

A surge protector with a protective network of three surge protection units, each coupled between distinct combinations of leads, providing simultaneous surge protection across a three-wire AC system, specifically designed to absorb ring and combination surge pulse waves, allowing non-compliant HVAC components to meet industry standards when coupled with the protector.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional surge protection devices are used, then some basic surge protection is provided, but they fail to adequately protect against ring and combination surge pulse waves, resulting in non-compliance with IEEE Standard C62.41.2

Engineering Contradiction:

Improvesurge protection effectivenessVSAvoidprotective network structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The surge protector divides the protection function into three separate surge protection units, each dedicated to protecting a specific line combination (Line 1-Line 2, Line 2-Line 3, Line 3-Line 1). This segmentation allows each unit to be optimized for its specific protection task, ensuring comprehensive coverage of all possible surge paths in the three-wire system while maintaining clear functional boundaries.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention transitions from conventional single-line or two-line surge protection to three-dimensional phase-to-phase protection by adding surge protection units between all three line combinations. This dimensional expansion ensures that surges arriving through any phase combination are captured and protected, achieving full compliance with IEEE Standard C62.41.2 for ring and combination surge pulse waves.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If HVAC components are upgraded to meet IEEE Standard C62.41.2 compliance, then surge protection reliability is improved, but system costs increase significantly

Engineering Contradiction:

Improvesurge protection complianceVSAvoidsystem cost

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The surge protector acts as an intermediary device placed between the power source and the HVAC components. It provides the necessary surge protection functionality without requiring modification or replacement of the existing HVAC components. This mediator approach allows non-compliant components to achieve compliance when used with the protector, significantly reducing overall system costs.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The surge protector is designed as a relatively inexpensive protective device that can be easily replaced if needed, whereas upgrading individual HVAC components to meet compliance standards would be costly. By investing in this smaller, cheaper protective device, the system achieves compliance without the high cost of component upgrades.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of operation

If existing surge protectors are used, then installation is simple, but they cannot protect against all types of surge pulse waves including ring and combination waves

Engineering Contradiction:

Improveinstallation simplicityVSAvoidsurge pulse wave coverage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The surge protector is designed with universal applicability to three-wire HVAC systems, providing protection against all types of surge pulse waves including line-to-ground, line-to-line, ring waves, and combination waves. The three surge protection units configured between all line combinations create a universal protection scheme that handles any surge scenario without requiring different devices for different protection needs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The surge protector effectively prevents damage from power line anomalies, enabling the use of less expensive, non-compliant HVAC components to comply with industry standards, reducing overall system costs and extending the lifespan of protected components.

Implementation Method 1

the protective network configured to provide simultaneous surge protection between each of the distinct combinations

Methodology Applied

Scientific EffectEnergy absorption: Absorption (EM radiation)

Data Source

PatentUS8861148B2Surge protector, an HVAC unit including the surge protector and a method of testing electrical equipment

Publication Date: 2014.10.14 LENNOX IND INC

AI summary

A surge protector, an HVAC unit including the surge protector and a method of testing electrical equipment employing the surge protector is disclosed. In one embodiment, the surge protector includes: (1) a first lead, a second lead and a third lead and (2) a protective network having three surge protection units with one of the three surge protection units coupled between each distinct combination of the first, second and third leads, the protective network configured to provide simultaneous surge protection between each of the distinct combinations.