The TTM is designed for easy installation on single or three phase single tank transformers. Local indication includes calculated winding temperature, peak winding temperature, top oil temperature, and peak top oil temperature with manual reset. Displays are .39" backlit LCD's that continuously display all four temperatures simultaneously. Communications include SCADA ready outputs, dry contacts for local annunciation, and a RS232/485 port.
The TTM features several new user options. Ambient compensation will compensate for hot weather by starting fans at any programmable setback temperature. The TTM can effectively be used to automatically manual the cooling system during hot spells. The cooling monitor "learns" the current required to run each of two stages of cooling. An alarm may then be set for any reduced percentage of cooling current. In addition, the TTM can alternate between two stages of cooling.
The TTM is housed in an 8" X 10" X 6" NEMA 4x windowed enclosure. The enclosure is designed to be mounted on an existing transformer control cabinet. Ambient operating temperature range is -40 degrees C to 70 degrees C. Winding and oil temperatures are both obtained using a single Pt100 RTD probe and one or three built-in current transducers.
Installation requires connecting one or three supplied clamp on CTs to existing secondary current circuits. The analog outputs can be connected to an existing SCADA system. The analog outputs supplied are 0 - 5 volts dc, 4-20ma or 0-1ma "switchable" representing -40 to 180 degrees centigrade for oil and winding temperatures. The TTM is designed to meet IEEE/ANSI C37.90 surge specifications for protective relaying applications.
The TTM is shipped complete with RTD Temperature probe, 24ft SJT probe cable, 5ea. Snap-on current transformers, Nema 4X windowed enclosure.
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