HS2D & HS2D+

High‑Speed Depressurization System

Prevent transformer explosions in <3 ms. Mechanical. Compliant. Scalable.

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Solution Overview

HS2D — Fast Mechanical Trigger

Opens in <3 ms to vent pressure before static pressure builds. Purely mechanical for maximum reliability and operation in harsh environments.

HS2D+ — Enhanced Safety

Adds inert gas sweeping and optional monitoring, while keeping mechanical activation. Ideal where extra mitigation is required.

Comparison

Feature	HS2D	HS2D+	Pressure Relief Valve
Activation	< 3 ms	< 3 ms	Slow
Activation after short-circuit for 400 MVA transformer	< 25 ms	< 25 ms	~ 85 ms
Inert Gas Injection	Optional	Included	None
Monitoring	Optional	Included	None
Standards	NFPA 850, IEEE, IEC, CIGRE *	NFPA 850, IEEE, IEC, CIGRE *	Varies

* Designed in accordance with NFPA 850 and aligned with IEEE, IEC and CIGRE recommendations.

Benefits & ROI

Safety & Resilience

Eliminate explosions, fires and environmental spills. Protect your workforce and critical infrastructure.

Cost Savings

Avoid multi‑million dollar losses from repairs, downtime and liability. Lower insurance premiums.

Retrofit & Scale

Compatible with new or existing transformers from 1 MVA to 1000+ MVA. Modular design enables easy upgrades.

Standards & Compliance

NFPA 850

Meets fast depressurization criteria: passive mechanical activation within milliseconds before static pressure rise.

IEEE & CIGRE

Aligned with reliability guidance favoring passive devices that evacuate energy prior to dangerous pressure buildup.

IEC 60076 & ATEX/IECEx Zone 2

Operates with mineral and natural ester oils and in hazardous environments.

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