Transformer Bund Filters | Draineezy Oil Removal Filters for LV MV HV Transformers (11kV, 33kV, 66kV)

Transformer Bund Filters

Transformer Bund Filter | Draineezy Oil Removal Filters

LV MV HV Transformers (11kV, 33kV, 66kV)

The Transformer Bund Filter range manufactured by Green Rhino and distributed by Thorne & Derrick provides passive, self-regulating environmental protection for LV, MV & HV oil-filled transformers (11kV, 33kV, 66kV).

The filters for transformer bunds are designed to prevent bunds from overflowing during rainfall events, the Draineezy Bund Filter System allows clean water to drain freely while automatically blocking and retaining oil in the event of a leak or catastrophic transformer failure.

The filters are suitable for onshore wind farms, solar farms, battery energy storage sites, industrial substations and utility networks.

Draineezy offers a significantly lower-cost and low-maintenance alternative to traditional oil/water separators and vacuum tanker removal.

DrainEezy Bund Filters – Product Gallery


DrainEezy Bund Filter	DrainEezy New Design	Oil Filled Transformers

Draineezy Bund Filters – Key Benefits

Automatic oil shut-off valve – the filter closes instantly when transformer oil is detected
Prevents rainfall-related overflow in transformer bunds
No power supply required – an entirely passive filter system
Fits new or existing bunds – concrete, steel or composite
Huge cost savings vs oil-water separators and vacuum tankers
UV-stable, corrosion-proof components for long service life use on LV MV HV Transformers
Low environmental risk – protects soil, drains and watercourses
Ideal for onshore wind, solar, substations, BESS & utilities

How the Transformer Bund Filter Works

The Draineezy bund filter system uses a proprietary filtration media that allows clean rainwater to pass through while capturing hydrocarbons. If oil is detected, the automatic shut-off valve seals instantly to prevent any discharge from the transformer bund.

Rainwater collects inside the transformer bund
Water flows through the Draineezy filter medium
The filter removes hydrocarbons from the water
If leaking transformer oil is detected, the filter solidifies and automatically seals
Clean water is discharged safely into the surface water drainage system

This ensures zero oil escape – even in major transformer failure scenarios.

Transformer Bund Filter – Technical Features

Flow rate: High-throughput drainage even in heavy rainfall.
Oil retention capacity: Designed for transformer catastrophic loss scenarios.
Filter installation: Horizontal or vertical orientation of the filter system.
Maintenance: Visual inspection only – no moving parts.
Service life: Long-lasting filtration media (typ. 3–5+ years depending on site).
Filter connection options: 2”, 3” and 4” outlet compatibility.
Certifications: Site environmental compliance for oil-filled HV (High Voltage) equipment.

Filter Applications

Onshore wind turbine transformer bunds
Solar farm inverter/transformer bunds
Battery Energy Storage Systems (BESS)
Primary and secondary substations MV HV
Utility networks – including DNOs, IDNOs
Industrial transformers (Oil-filled LV MV HV)
OEM transformer manufacturers

DrainEezy Bund Filters (Mineral & Ester Oils)

Transformer Bund Filter Part Code	Description	Fitting	Oil Capacity
GRR030000HRC	DrainEezy Bund Filter for Mineral Oil 1L	1.5” Thread	Up to 1L Oil
GRR030020HRC	DrainEezy Bund Filter for Mineral Oil 2L	2” Thread	Up to 2L Oil
GRR031003HRF	DrainEezy Bund Filter for Mineral Oil 14L	4” Thread	Up to 14L Oil
GRR031002HRF	DrainEezy Bund Filter for Mineral Oil 14L	4” Cam Lock	Up to 14L Oil
GRR030101ERC	DrainEezy Bund Filter for Ester Oils	1.5” Thread	Up to 1.5L Oil

DrainEezy Pre-Filter

Transformer Bund Filter Part Code	Filter Description	Filtration
GRR 03 50 01 PREF	DrainEezy Pre-Filter (1.5″ Thread)*	100 Microns
* Can be adapted for 2″ thread.

DrainEezy Fitting Kits

Transformer Bund Filter Part Code	Filter Description	Size
GRR 03 51 00 FITK	DrainEezy 1.5″ ABS Fitting Kit (Most popular)	25.9 × 16.2cm
GRR 03 51 01 FITK	DrainEezy 1.5″–2″ ABS Fitting Kit	26.1 × 19.1cm
GRR 03 51 02 FITK	DrainEezy 1.5″ ABS XL Fitting Kit	25.9 × 66.2cm
GRR 03 51 50 FITK	DrainEezy 1.5″ SS Fitting Kit	22.7 × 13.5cm
GRR 03 52 00 FITK	DrainEezy 2″ ABS Fitting Kit	28.6 × 17.5cm
GRR 03 52 50 FITK	DrainEezy 2″ SS Fitting Kit	26.5 × 15.1cm

Watch the Transformer Bund Filter in action:

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Draineezy vs Traditional Oil-Water Separators

Features	Draineezy Bund Filter	Oil-Water Separator
Power Required	No	Yes
Maintenance	Low	High
Installation Cost	Low	High
Environmental Risk	Very Low	Medium
Response to Oil Spill	Instant Automatic Shut-off	Manual Intervention

Transformer Bund Filters | Draineezy Oil Removal Filters for LV MV HV Transformers (11kV, 33kV, 66kV)

Draineezy Bund Filter

For LV/MV/HV Transformer Bund Protection

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Transformer Bund Filter – FAQ

Q1: What happens if the transformer leaks oil?
A1: The automatic shut-off valve immediately seals, preventing contaminated water from leaving the bund.

Q2: Does the system require power?
A2: No – the Transformer Bund Filter is a 100% passive system.

Q3: How long does the filtration media last?
A3: Typically 3–5 years depending on contamination levels and site conditions.

Q4: Is it compliant with environmental requirements?
A4: Yes – Draineezy is designed for environmental protection around oil-filled transformers.

LV MV HV Transformers, Cables & Electrical Equipment

Thorne & Derrick distribute the most extensive range of 11kV 33kV Cables, Cable Jointing, Terminating, Pulling & Installation Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at 11kV 33kV and up to and EHV transmission and distribution voltages; approved stockists and suppliers of 3M Electrical (ColdShrink), Nexans (Euromold), Pfisterer (CONNEX) and Lovink cable accessory and connection products.