Protecting Generation Assets Without Trading Away Availability

Power generation has a particular problem with fire safety: the asset that needs protecting is also the asset that must not stop. A protection scheme that trips the unit on a hot surface, a welding arc or a patch of afternoon sun is not a safe system — it is a system that will be bypassed within a year, and then it protects nothing at all.

ZE-Tronics engineers fire and gas safety for thermal and gas-fired generation, hydroelectric plant, substations and transmission infrastructure, and for the battery energy storage systems now being built alongside them. The objective is the same everywhere: detect early enough to act, discriminate well enough to be trusted.

Gas turbines and their enclosures

A turbine enclosure concentrates every difficulty in one box. Fuel gas and lube oil are present under pressure, surfaces run hot enough to ignite both, ventilation rates are high enough to dilute a gas cloud before it reaches a sensor, and vibration steadily works on every bracket, gland and connector inside.

• Multi-spectrum infrared flame detection selected for false-alarm immunity against hot surfaces and reflected radiation
• Fuel gas detection sited for the enclosure’s actual airflow pattern, not its floor plan
• Confirmed voting logic so no single detector fault can trip a unit
• Fire-rated enclosure penetrations and vibration-tolerant mounting design
• Clean agent or water mist release logic with damper and ventilation interlocks

Combustion equipment elsewhere in the plant — boilers, reformers, fired heaters — needs the same discipline applied to burner management: flame monitoring, ignition supervision and combustion safeguard logic that shuts fuel off on loss of flame rather than allowing an unburned accumulation.

Generators, hydrogen and why it is specified separately

Hydrogen-cooled generators, and the electrolyser plant now appearing on the same sites, need detection specified for hydrogen from the start. Infrared sensors — the default for hydrocarbon gas — cannot detect hydrogen at all, because it has no absorption band in the range they use. Catalytic or electrochemical sensing is required. Hydrogen also rises rather than pools, so detectors belong at the highest point of an enclosure, and it burns with a flame that is very nearly invisible, which changes the choice of flame detector as well.

Transformers, switchgear and cable routes

Transformer fires are fast, fuel-rich and hard to approach. Protection is built around rapid detection and a decisive response — deluge or water spray release with confirmed initiation, bund and drainage arrangements that prevent burning oil from spreading, and separation that limits what one transformer can do to its neighbour.

Cable tunnels, trays and galleries are a different problem. The fire load is distributed along a length rather than concentrated at a point, and the fire’s position determines which access route is still usable. Linear heat detection — a sensing cable run along the route — reports both the alarm and its location along the cable, which is exactly the information the response needs.

• Deluge and water spray for indoor and outdoor transformers with confirmed release
• Linear heat detection for tunnels, cable trays, galleries and conveyor structures
• Aspirating smoke detection for switchrooms, control rooms and relay rooms
• Clean agent suppression where water would destroy what it is protecting
• Voice notification and visual alarm devices sized for high ambient noise

Battery energy storage

Lithium-ion storage introduces a failure mode that conventional fire detection handles badly. A cell entering thermal runaway vents electrolyte vapour — a measurable, flammable off-gas — well before there is heat or smoke that a conventional detector would register. Detecting that off-gas converts a fire event into a controllable one: there is time to ventilate, isolate the affected rack and hold the event before propagation begins.

We design BESS protection around off-gas detection as the primary layer, with thermal monitoring, aspirating smoke detection and suppression behind it, and with the enclosure’s ventilation and deflagration arrangements considered as part of the same scheme rather than as a separate discipline. NFPA 855 governs the installation; the engineering has to satisfy it and still work in the specific enclosure being used.

Integration that respects independence

The fire and gas system must not depend on the process control system to perform its safety function — NFPA 72 states it directly, and NORSOK and UK HSE guidance reach the same conclusion. It must act on what it detects, then inform the control system of what it has done and what it requires.

In practice this means designing the interface deliberately. Actions that cannot be allowed to fail with a communications link are hardwired. Status, diagnostics, drift trending and event history travel over serial or fieldbus into the DCS, SCADA or BMS, so operations get a single coherent picture without the safety function ever borrowing the control system’s availability.

Certified equipment and traceable calibration

Everything installed in a classified area carries the certification the area demands, from an authorised manufacturer partnership rather than an equivalent found late in procurement. After handover, detection is only as good as its last calibration: our in-house laboratory is accredited to AZS ISO/IEC 17025:2020 for fixed and portable gas detection, and our electronics repair bench services flame, gas and smoke detectors and their controllers in country, which removes weeks of shipping from every fault.

See our engineering, commissioning and calibration services, or tell us about your plant and we will review the detection scheme.