3 HYDRAN 201TI INTELLIGENT TRANSMITTER
The Hydran 201Ti 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 H201Ti is illustrated in Figure 2-1.
3.1 Features
The main features of the Hydran 201Ti are:
• A Hydran 201 sensor that measures a composite value of the following dissolved
gases in oil: hydrogen (H2), carbon monoxide (CO), acetylene (C2H2) and ethylene
(C2H4).
• 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 H201Ti 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.
• Immunity to electrical surge, radio-frequency interference and electrostatic
discharge, as enumerated in the Technical specifications (section A-1).
• An isolated USB Type B connector for communication with a host computer
running the Hydran Host software.
• Serial communication with a Hydran 201Ci Controller through a supervisory link
(communication cable between an H201Ti and an H201Ci).
• Full stand-alone capabilities when the host computer (running the Hydran Host
software) is not used.
• Wide ambient temperature range for all-weather outdoor operation.
• A thermal regulating system.
• Communication protocols: proprietary Hydran protocol or ModBus RTU protocol
• Terminal blocks to connect the following components:
- AC power supply.
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