The Best Companion for Substation Maintenance

Workers inspecting industrial equipment outdoors.

Drykeep

A different way to perform transformer maintenance.
The oil recirculator does not require any maintenance downtime.
Intelligent in-line drying system that provides continuous maintenance before a failure occurs in your transformers.
Drykeep = System for the extraction and control of humidity for energized transformers and reactors.

The Advantages

Avoid catastrophic failures in your power transformers.
Combat humidity in your transformers!
Proven efficiency with equipment installed throughout Mexico.
Preventive transformer maintenance.

Workers near industrial equipment outside brick building.

System status display with moisture levels.

DRYKEEP Can Upload Data to Smart Grids

Smart Transformer Maintenance, as all DryKeep® SMART systems include permanently installed oil moisture sensors and a flow rate monitor that sends data to a smart controller. The smart controller monitors and controls the dehydration process while recording all oil moisture, estimated paper insulation moisture, and oil temperature data. An integrated RTU provides remote access to all logged and real-time data, alarms, and system control via cellular, VPN, Ethernet, fiber, and/or SCADA, with all DryKeep® SMART (SCADA Monitoring and Analysis Reporting Technology) systems include permanently installed oil moisture sensors and a flow rate monitor that sends data to a smart controller. The smart controller monitors and controls the dehydration process while recording all oil moisture, estimated paper insulation moisture, and oil temperature data. An integrated RTU provides remote access to all logged and real-time data, alarms, and system control via cellular, VPN, Ethernet, fiber, and/or SCADA with:

DNP3—SCADA slave and MODBUS RTU/TCP/ASCII/RTU protocols.
Multi-carrier 4G LTE-compatible cellular alarm with 3G/2G backup.
RJ45 Ethernet ports, 62.5/125 um (SC) multimode fiber converter.
Cellular VPN for remote system monitoring, control, and reporting.

Reliable Data With Drykeep

Moisture is always in a dynamic state, migrating between the oil and the cellulose insulation, which means that a moisture reading from an oil sample taken at a single point in time may not be typical. These variable factors can provide a false sense of reliability and consistency when taking individual samples for Karl Fischer testing. Many aspects must be considered when collecting, transporting, and storing oil samples. Samples can easily become contaminated if sampling instructions are not strictly followed. The new SMART DryKeep® continuous online monitoring system eliminates these variables.
Sensors permanently installed at the inlet and outlet points of the SMART DryKeep® system provide a repeatable process that continuously measures the water content and temperature of the oil.
All data is plotted on trend screens and recorded for retrieval for historical analysis.
This way you have reliable transformer maintenance.

Graph showing PPM and temperature trends.

Industrial equipment with DryKeep branding and valves.

Drykeep Technology Prevents Over-Drying

The DryKeep® SMART drying control system prevents over-drying of transformers by controlling oil flow through the system based on the estimated moisture content of the paper insulation.

When the DryKeep® system brings the transformer to a safe humidity level, the SMART controller will signal the diverter tee valve actuator to re-route the oil flow to bypass the drying cylinders and prevent over-drying.
The system pump will continue to operate, allowing oil to flow past the built-in sensors to continue providing all system data and monitoring the estimated moisture percentage in the transformer paper in this bypass mode.
If the system sees that the moisture percentage in the paper rises above the safe level, the system will signal the T-diverter valve actuator to change the oil flow path through the drying cylinders to remove moisture until the safe level is reached again.

Components of a Drykeep System

Two (2) permanent moisture sensors in the oil.
Flow indicator switch to monitor possible leaks.
Safety isolation solenoid valves at the inlet and outlet to isolate DryKeep® from the transformer in the unlikely event of a leak.
Deaerator tank with oil purge valve and hose to remove oxygen from the system.
One (1) or three (3) regenerable adsorption cylinders.
Static-dissipating PTFE stainless steel braided hoses between cylinders.
7” color touchscreen HMI with 12 MB of integrated data, 4 GB Micro SD card for data logging, and 2 USB ports.
Built-in RTU for remote access via SCADA, CPU, and/or cellular with DNP3 – slave and MODBUS RTU/TCP/ASCII/SCADA RTU protocols. — Cellular alarm with multi-carrier 4G LTE support with 3G/2G backup. – RJ45 Ethernet ports and one fiber optic port.
Visual and remote alarm/signaling for flow integrity, leak detection, and cylinder saturation.
Flow rate of approximately 1.5 LPM using a 120V/60Hz or 230V, 50Hz, leak-proof, sealless, canned rotor type pump.
Stainless steel frame, cylinders, valves, and hardware. The unit offers substation-quality durability.
Hydraulic quick couplings for rapid changes of saturated cylinders while the transformer remains energized.
24V DC power supply for sensors and control cabinet components.
RJ45 Ethernet panel interface connector to allow download of logged data without opening the enclosure.
1 micron particle filter with visual status indicator.
Two (2) oil sampling ports.
Ultra wideband 2G/3G/4G/5G/LTE/Cellular/CDMA and Wi-Fi antenna.