DryKeep® is suitable for any size transformer and has been successfully installed on transformers greater than 800mVA.

All DryKeep® systems fully comply with IEEE Standard C57-140-2006, section 7.2 and are manufactured in the USA under ISO 9001 quality management.

Two sizes are available depending on the mVA rating of the transformer. Recommended selection criteria is as follows:

SYSTEMS:  # OF CYLINDERS TRANSFORMER SIZE MINIMUM H20 REMOVAL
RT-3 1  LESS THAN 10 MVA  3 LITERS
 RT-9  3  10 MVA AND LARGER  9 LITERS

DryKeep® offers 2 models for each size:

1. SMART design with complete instrumentation and control package.

2. Basic unit with bypass valves/oil sampling ports to incorporate customer-supplied on-line monitoring of temperature and moisture in oil and allow for oil sampling.

Available Products

The standard RT-3 and RT-9 come with the SMART instrumentation and control package. 

Catalog Number DryKeep SMART RT-3

  • Single cylinder transformer dry-out system with SCADA monitoring, analysis, reporting technology.
  • Continuous transformer moisture monitoring and dehydration system fully assembled and ready for easy installation for transformers rated below 10mVA.  System continuously circulates transformer oil and dries it through moisture adsorption by a charge of molecular sieve granular adsorbent material stored in a single cylinder.  Will circulate and dry the main tank oil while the transformer is in-service.   Cylinder can capture a minimum of 3 liters of moisture before saturation and regeneration is required.
  •  Complete with permanent moisture-in-oil monitors and plc-based monitoring and control system.
  • Built-in Ethernet communications port for remote access thru SCADA or other CPU data retrieval.
  • Audible, visual, and remote SCADA alarm/signaling for flow rate integrity and cylinder saturation.
  • Approximately 1.5 LPM flow rate using 120v-60Hz or 240v-50Hz, seal-less, leak proof, canned, rotor type pump.
  • All metal parts are of stainless steel construction and unit is of substation quality durability.
  • Hydraulic quick couplers allow for fast and simple saturated cylinder change-outs while transformer remains energized.
  • Integral DC power supply for sensors, PLC, and HMI display screen.

  • All PLC, communication, and protective devices are enclosed in a pad-lockable NEMA 4– IP65 enclosure with hinged door, inner swing panel, and outer cover.

  • 10-micron particle filter with visual status indicator.

  • Two oil sampling ports. De-aerator with air bleed valve and lockable isolation valves at input and output.

  • ISO-9001 certified.

  • Fully complies with IEEE standard C57-140-2006, 7.2.

  • Made in the USA.

Catalog Number DryKeep SMART RT-9

  • Three cylinder transformer dry-out system with SCADA monitoring, analysis, reporting technology.
  • Continuous transformer moisture monitoring and dehydration system fully assembled and ready for easy installation for transformers rated below 10mVA.  System continuously circulates transformer oil and dries it through moisture adsorption by a charge of molecular sieve granular adsorbent material stored in a single cylinder.  Will circulate and dry the main tank oil while the transformer is in-service.   Cylinder can capture a minimum of 3 liters of moisture before saturation and regeneration is required.
  •  Complete with permanent moisture-in-oil monitors and plc-based monitoring and control system.
  • Built-in Ethernet communications port for remote access thru SCADA or other CPU data retrieval.
  • Audible, visual, and remote SCADA alarm/signaling for flow rate integrity and cylinder saturation.
  • Approximately 1.5 LPM flow rate using 120v-60Hz or 240v-50Hz, seal-less, leak proof, canned, rotor type pump.
  • All metal parts are of stainless steel construction and unit is of substation quality durability.
  • Hydraulic quick couplers allow for fast and simple saturated cylinder change-outs while transformer remains energized.
  • Integral DC power supply for sensors, PLC, and HMI display screen.

  • All PLC, communication, and protective devices are enclosed in a pad-lockable NEMA 4– IP65 enclosure with hinged door, inner swing panel, and outer cover.

  • 10-micron particle filter with visual status indicator.

  • Two oil sampling ports. De-aerator with air bleed valve and lockable isolation valves at input and output.

  • ISO-9001 certified.

  • Fully complies with IEEE standard C57-140-2006, 7.2.

  • Made in the USA.

Catalog Number DryKeep RT-3

  • Single cylinder continuous transformer dehydration system fully assembled and ready for easy installation for transformers rated below 10mVA. System continuously circulates transformer oil and dries it through moisture adsorption by a charge of molecular sieve granular adsorbent material stored in a single cylinder. Will circulate and dry the main tank oil while the transformer is in-service. Cylinder can capture a minimum of 3 liters of moisture before saturation and regeneration is required.
  • Approximately 1.5 LPM flow rate using 120V-60Hz or 240v-50Hz seal-less, leak proof, canned, rotor type pump.
  • All metal parts are of stainless steel construction and unit is of substation quality durability.
  • Hydraulic quick couplers allow for fast and simple saturated cylinder change-outs while transformer remains energized.
  • 10-micron particle filter with visual status indicator.
  • Bypass valves/oil sampling ports provided at both the inlet and outlet so system is capable of incorporating on-line monitoring of temperature and moisture in oil and allows for oil sampling.
  • Visual oil flow indicator, de-aerator with air bleed valve, lockable isolation valves at input and output.
  • ISO-9001.
  • Complies with IEEE standard C57-140-2006, 7.2.
  • Made in USA.

Catalog Number DryKeep RT-9

  • Three cylinder continuous transformer dehydration system fully assembled and ready for easy installation for transformers rated below 10mVA. System continuously circulates transformer oil and dries it through moisture adsorption by a charge of molecular sieve granular adsorbent material stored in a single cylinder. Will circulate and dry the main tank oil while the transformer is in-service. Cylinder can capture a minimum of 3 liters of moisture before saturation and regeneration is required.
  • Approximately 1.5 LPM flow rate using 120V-60Hz or 240v-50Hz seal-less, leak proof, canned, rotor type pump.
  • All metal parts are of stainless steel construction and unit is of substation quality durability.
  • Hydraulic quick couplers allow for fast and simple saturated cylinder change-outs while transformer remains energized.
  • 10-micron particle filter with visual status indicator.
  • Bypass valves/oil sampling ports provided at both the inlet and outlet so system is capable of incorporating on-line monitoring of temperature and moisture in oil and allows for oil sampling.
  • Visual oil flow indicator, de-aerator with air bleed valve, lockable isolation valves at input and output.
  • ISO-9001.
  • Complies with IEEE standard C57-140-2006, 7.2.
  • Made in USA.

Optional accessories:

NEMAEnclosureC NEMAEnclosureB NEMAEnclosureAFree-standing climate controlled enclosure for extreme temperature environments

Where environmental operating temperatures may fall below 0°C an optional 90” x 60” x 20” NEMA 4 double-door free-standing enclosure made of 12 gauge steel with lifting eyes, painted ANSI 61 gray polyester powder paint inside and out is available.  Enclosure includes a 17” x 11” Lexan viewing window on the right door. Enclosure is UL Listed Type Rating 4, CSA Certified Type Rating 4.  The DryKeep® frame is mounted to horizontal Unistruts welded on the rear of the enclosure.  A climate control package is mounted on the left side to control the temperature inside enclosure.   ½” provisions are found on the right side of enclosure for inlet and outlet connections between system and transformer.  SMART unit stack lights are mounted on top of enclosure.

FlangeKit installationkitInstallation Kit

Contains two 0.44” O.D. 304 stainless steel braided PTFE hoses to connect the DryKeep® inlet and outlet valves to the transformer, flange and gaskets for the transformer drain and fill valves, and all hardware for all connections to the transformer.

CylinderSpare cylinders

Completely filled with DryKeep® adsorbent material and transformer oil.

We reserve the right to make changes to any described details and technical data contained herein without notice.  Continuous product enhancement by DryKeep® and local conditions may also result in deviations.