GE Hydran 201i, Instruction Manual

Page: 37 / 300

Part 17997 Rev. 6, March 2011 2-1
Chapter 2
Hydran 201T i Intelligent Transmitter
The Hydran 201T i is an intelligent, on-line monitoring system that measures the level of
combustible gases in dielectric oil for the early detection and monitoring of incipient faults
in transformers or any other oil-filled electrical equipment.
A picture of the H201T i can be found in Figure 1-1 on page 1-3.
2.1 FEATURES
The main features of the Hydran 201T i are:
• A Hydran 201 sensor that measures a composite value of the following dissolved gases
in oil: hydrogen (H
2
), carbon monoxide (CO), acetylene (C
2
H
2
) and ethylene (C
2
H
4
)
• Easy installation on a valve of the equipment to be monitored
• A six-key membrane keypad
• A backlit, alphanumeric, liquid crystal display (LCD) to use the H201T
i without a host
computer. Provides the following on-line information:
– Level of dissolved gases in oil
– Hourly trend (gas level variation during a period of time measured in hours)
– Daily trend (gas level variation during a period of time measured in days)
– Alarm messages
• Three alarms:
– Two gas alarms (High and High-High; levels are adjustable), triggered by the gas
level, and the hourly and daily trends
– One system fail alarm, triggered by several conditions
• Four historic data files (automatic recording of data):
– Events (recording at the time of events; example: alarms)
– Short Term and Long Term (recording at fixed, adjustable logging rates)
– Service (recording at the time of the sensor tests)
• Semimonthly, automatic sensor test and state report
• Digital calibration of the analog inputs and output
• Isolated, analog 4–20 mA output
• An extremely high immunity to electrical surges, radio-frequency interferences and
electrostatic discharges