Load Tap Changer Filtration Systems0 pages

Load Tap Changer Filtration Systems

HILCO’s complete line of ltration products can meet your requirements
Proven performance. Electric utility companies continue to show interest in using Hilsorb™
dryer lters on their transformer load tap changers (LTC). Rightfully so, as these lter cartridges
have extended the time between maintenance intervals, thereby saving utility dollars. Dryer/lter cartridges, such as the PD718-12-CN, remove free water as well as particulate down to 1
micron ensuring that the contacts in the LTC always operate in oil that is at its prime dielectric
strength. (See HHB-1)
HILCO: the originator of the LTC ltration system. For 15 years, HILCO has provided ltration systems to the utility industry to clean up LTC oil compartments. Since the original pilot
project with Virginia Power in the early 1980s (see VPA-1), HILCO has manufactured hundreds
of custom-designed systems for various utility companies.
Products to meet everyone’s needs. Experience has shown that each utility has different
requirements for LTC lters. Some companies are interested in ‘bare bones’, standard HILCO
housings. When these units are properly installed, they provide an economical solution to
the problem. On the other end of the spectrum, many utilities have opted for all the ‘bells and
whistles’, where only simple plumbing and electrical work is required. In all cases, HILCO has
the right product for you.

LTC Filtration System
Standard Features
• 3.5 gpm positive displacement pumps
close coupled to 1/3 HP TEFC motor.
Pump has 60 psi built-in relief valve.
• NEMA-4 electrical enclosure
• Buna-N o-ring cover seals
• Vent cock
• Y-strainer
• Pressure gage to detect dirty cartridge
• ANSI #70 gray paint
• Pressure switch, SPDT or DPDT to
detect dirty cartridge
• Run light
• Dirty cartridge indicator light