Risk Assessment for Insulation Coordination in High-Voltage Electronics
Manufacturer-independent assessment of contamination, humidity, materials, and coatings to support reliable decisions on insulation coordination.
Risk Assessment What Does Insulation Coordination Mean in High-Voltage Electronics?
Insulation coordination defines how clearances, creepage distances, and insulation systems are designed to withstand the expected electrical and environmental stresses. In high-voltage applications, the actual insulation risk is influenced not only by the voltage level, but also by contamination, humidity, material properties, and coatings.
ZESTRON assesses these factors independently of manufacturers, based on practical application conditions and technical data. We evaluate how particles, ionic contamination, residues, and coatings affect insulation risk and provide a transparent risk assessment, specific technical recommendations, and documented findings to support internal decisions and discussions with OEMs.
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Confidential and structured. With NDA on request.
Validation and ApprovalWhen Does Insulation Coordination Become a Project Risk?
High-voltage power electronics are evolving from today’s typical voltage levels of 400 to 500 V towards 800 to 1,200 V. As voltage levels increase, failure modes and risk profiles change as well. Electrical breakdown, leakage currents, and humidity-related effects can therefore no longer be reliably assessed based on experience from low-voltage applications.
Insulation coordination provides the design framework for addressing these risks. Clearances, creepage distances, and the insulation system must be designed to prevent insulation failure under the expected operating and environmental conditions.
A key parameter is the pollution degree. It describes the extent to which contamination may become electrically conductive under the relevant environmental conditions and the role of humidity and condensation.
This raises a key question: How can the appropriate pollution degree be justified with confidence when experience from low-voltage applications is no longer sufficient and evidence in accordance with IEC 60664-1 is required?
In practice, insulation coordination often becomes a critical project issue in situations such as these:
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An OEM requires a clear technical justification of the pollution degree and the required clearances and creepage distances.
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During validation or in the field, issues such as sporadic electrical breakdown, tracking, or indications of leakage current occur.
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An existing platform is being transitioned to 800 V or higher voltage levels, or materials and environmental profiles are changing.
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There is uncertainty as to whether assumptions regarding contamination, humidity, and condensation reflect the actual operating conditions.
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Technical documentation is required for series approval, PPAP, internal decision-making bodies, or audits.
ZESTRON provides manufacturer-independent assessment of the relevant influencing factors, helps evaluate insulation risks in their technical context, and provides a reliable basis for approval decisions, further validation, and any required measures.
Basis for Decision-MakingObjective of the Risk Assessment
The objective is to establish a reliable technical basis for decisions on insulation coordination under actual operating conditions.
The risk assessment addresses three key questions:
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What is the actual risk of insulation failure under the expected electrical and environmental stresses?
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Which factors drive the risk in the specific electronic assembly or application?
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Which measures can reduce the risk effectively, and how can their effectiveness be verified?
The result is a transparent technical assessment that supports decisions on approval, validation, and any required measures. It can also serve as a documented basis for internal coordination and discussions with OEMs or suppliers.
What Is Specifically Assessed in Insulation Coordination?
A reliable justification of the pollution degree requires more than assessing individual factors in isolation. What matters is how the relevant risk drivers interact under actual operating conditions.
The assessment focuses in particular on:
Technical Cleanliness
Particles and residues that can affect insulation distances
Ionic Contamination
Ionic residues which, in combination with moisture, can promote conductive films and leakage currents
Conformal Coating
The actual protective effect of a coating, including possible weak points
ZESTRON assesses these influencing factors independently of manufacturers using targeted analytical methods and validation. Depending on the specific question, this may include breakdown voltage analysis, ion chromatography, and coating tests. The methods are selected according to the insight they provide for the specific insulation coordination challenge and the technical decision at hand.
ApproachFrom Risk Assessment to Reliable Findings
To turn the risk assessment into a reliable basis for insulation coordination decisions, ZESTRON follows a structured three-step approach. The scope of the assessment and the analytical methods used are tailored to the specific technical question and the evidence required.
Step 1
Assess the Application and Operating Conditions
The assessment begins by reviewing the voltage level, electronic assembly design, operating environment, known failure modes, technical requirements, and specifications. This establishes which factors are actually relevant to the specific insulation coordination challenge.
Step 2
Assess the Relevant Risk Drivers
Based on the specific technical question, the relevant influencing factors are investigated in a targeted manner. Depending on the application, these may include technical cleanliness, ionic contamination, humidity exposure, and the protective performance of coatings. Analytical methods and validation are selected to provide reliable evidence for the specific risk assessment.
Step 3
Assess the Risk and Define Appropriate Measures
The results are evaluated in the context of the application, environmental conditions, and relevant requirements. This provides a transparent risk classification, prioritized measures, and recommendations for further validation or technical risk mitigation.
What do you receive as a resultA Reliable Basis for Technical Decisions
You receive concise, transparent documentation that brings together the findings relevant to your decision:
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technical assessment of risks related to electrical breakdown, leakage current, and humidity effects
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justification of which assumptions regarding the pollution degree are technically valid under the conditions assessed
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prioritized measures for risk reduction, for example relating to process conditions, cleaning, and protective concepts
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clearly defined next steps for verifying the effectiveness of the measures
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documented support for internal decisions and discussions with OEMs or suppliers
The result provides a reliable basis for assessing insulation coordination requirements, reducing risks in a targeted manner, and technically supporting further validation or approval steps.
Getting StartedHave Your Insulation Risks Assessed Independently
When insulation coordination becomes a project issue due to OEM requirements, current failures, or a transition to higher voltage levels, an initial consultation can quickly clarify the objective, boundary conditions, and the most effective path to reliable findings.
As an independent service provider, ZESTRON assesses the specific technical question on a manufacturer-neutral basis. Alternatively, a sample assessment can provide a structured starting point.
Request a consultation
Confidential and structured. With NDA on request.
Whitepaper CollectionAnalytical Approach to Implementing Insulation Coordination
At 400 V to 1200 V, extrapolated low voltage assumptions are no longer sufficient. This white paper explains how pollution degree, contamination, and insulating materials can be assessed using an analytical approach.