Hydran 201Ti Mark IV Essential DGA monitoring for transformers

Hydran 201Ti

Mark IV Essential DGA monitoring for transformers

The HydranTM 201Ti is a small and easy to setup continuous Dissolved Gas-in-oil Analysis (DGA) monitor.

It provides the basic information used by IEEE® Standard C57.104 and can be used as an essential first

line of defence for the transformers in your fleet to obtain advance warning of a failure condition and

minimize the risk of unplanned outages.

The 201Ti’s composite-gas sensor provides the world renown “Hydran gas value” using fuel cell

technology (described as fixed instruments - method 3 in the standard). It responds 100% to Hydrogen

(general fault gas) and is also sensitive to Carbon Monoxide (overheated paper), Acetylene (arcing) and

Ethylene (overheated oil), thus covering all the main transformer failure root causes.

Because the monitoring unit mounts on a single valve and uses Dynamic Oil Sampling, there is no

need for a pump or extra piping to connect to different valves. Due to its uncomplicated features and

the easily understood information it provides, the 201Ti has been amongst the monitors of choice for

many years, with one of the largest installed base of any monitor.

With the latest Mark IV version, the Hydran 201Ti monitor has been completely overhauled with new

electronic boards and power supply to make it RoHS compliant, address any obsolescence issue and

further improve this time proven product.

It now offers additional features like:

• Improved sensor

• Modbus® protocol communication over isolated RS-485

• Local USB port to replace the RS-232 port no longer found on most field laptops

• Compatibility with GE’s acclaimed PerceptionTM Fleet software to download, trend and analyse data,

like with any other GE DGA monitoring equipment

Key Benefits

• Continually measures main H₂ fault gas

• Local LCD display

• Communicates gas ppm value remotely

• Proven and continuously improved design (over 30.000 units sold)

• Easy to install, single valve mount

Easy Asset Supervision

• Permanently mounts on a single transformer

oil valve. No extra piping or pump required

• Gas sensor responds 100% to Hydrogen

(general fault gas) and is also sensitive to

Carbon Monoxide (overheated paper)

• Optional 5 year sensor guarantee

Configurable Alarms

• An alarm is raised when an abnormal level of

fault gas is detected

• Two alarm levels (one for Alert and one for

Alarm) can be set to show increasing severity

• Alarms can be set on gas ppm levels or on gas

rate of change (ROC) over an hour or a day

• Automatic self-test every 15 days will trigger

service alarm if it detects a fault, including

power failure, oil valve closed, sensor or

battery needing replacement

Communication

• Local LCD display of the real-time dissolved

gas ppm value

• Analogue output (4-20mA) of the dissolved

gas ppm value

• Digital output of registers using Modbus or

Hydran protocols over isolated RS-485

• 3 dry contact relays also available 2 for the

fault gas alarms and one for the service alarm

Controllers

Remote PC

The 201Ti can be connected to optional controllers to facilitate communication

with multiple units and create a local network.

• The Ci-1 controller is a one channel controller that replicates some of the human

interface functions (gas value display, alarm buttons). This is ideal when the

201Ti is mounted out of reach on an upper valve of the transformer. It also

brings down the alarm relay contacts and the analogue output for easier wiring.

• The Ci-C controller receives the gas ppm data from up to four H201Ti, providing

a single communication point for all four monitors. It has no alarm relay or

analogue output. This is ideal when protecting 3 single phase transformers + 1

spare.

It is possible to “daisy-chain” up to 32 controllers or 201Ti through their RS-485

port. The maximum chain distance (all cables added up) is 1200m (4000ft). All the

201Ti connected to any of the daisy-chained controllers can be accessed through

any controller in the local network, thus facilitating communication by only having

to fit one RS-232 modem for example.

Technical Specifications

MEASUREMENTS

Sensor

• Fuel cell type sensor behind a gas-permeable

membrane in contact with mineral transformer

insulating oil through a flooded manifold

• Measurement range 0-2000 ppm (volume/ volume,

H₂ equivalent)

• Measurement accuracy ± 10 % of reading ± 25

ppm (H₂ equivalent)

Relative Sensitivty

• H₂: 100 % of concentration

• CO: 15 ± 4 % of concentration

• C₂H₂: 8 ± 2 % of concentration

• C₂H₄: 1.5 ± 0.5 % of concentration

Relative Sensitivty

• 10 minutes (90% of step change)

FEATURES

Display

• Backlit LCD, 2 lines x16 characters

• Keypad to setup unit and acknowledge alarms

Digital Communications

• USB port (type B connector) for local connection to

laptop computer for configuring the system

• RS-485 (terminal block), isolated to 2000 Vac

RMS, for supervisory link connection to optional

controllers and for remote communication

• Gas level (ppm) and gas rate of change (hourly

or daily ppm) outputs using Modbus or Hydran

Protocols over RS-485

Analouge Communications

• Gas level ppm output using 4-20mA for 0-2000

ppm range, 10V load maximum, isolated to 2000

Vac RMS

Alarms

• 3 different alarms: Gas Alert (Hi), Gas Alarm (HiHi)