GE HYDRAN ® 201i Transformer Online Monitoring System

Overall positioning of the system

HYDRAN ®  201i is an online monitoring system for dissolved gases in transformer oil launched by GE, used for early fault detection of oil immersed power equipment, and can upgrade the original HYDRAN 201R system.

Core components and parameters

1. HYDRAN ®  201Ti intelligent transmitter

Detecting gases: H ₂, CO, C ₂ H ₂, C ₂ H ₄

Measurement range: 0-2000 ppm (H ₂ equivalent)

Measurement accuracy: ± 10% reading ± 25 ppm

Response time: 10 minutes (90% step change)

Protection level: NEMA 4X (IP66)

Size: φ 178 mm x length 257 mm

Weight: 6 kg for installation, 7.3 kg for transportation

Working temperature: Environment * * -50~+55 ℃, oil temperature -50~+90 ℃ (high temperature adapter can reach 105 ℃ * *)

Power supply: 100/115/200/230 Vac ± 10% 50/60 Hz 350 VA

Relative sensitivity:

|Gas | Relative Sensitivity|

|H₂|100%|

|CO|18%±3%|

|C₂H₂|8%±2%|

|C₂H₄|1.5%±0.5%|

2. 201Ci Controller Series

Model Channel Number Display Analog Alarm Core Purpose

201Ci-1 1 LED 0-1999 ppm standard+optional standard single transmitter monitoring

201Ci-4 4 scrolling display+16 status LEDs optional expansion standard/optional expansion up to 4 transmitters

201Ci – C Up to 4 None None None None Pure Communication Gateway

Communication: RS-485 chain hanging * * ≤ 32 units * *, total distance 1300 m; RS-232 local/remote

Protection: NEMA 4X, working temperature * * -50~+55 ℃**

Power supply:<120 VA

3. HOST management software

System: Windows 3.1/95/98/NT4/2000/XP

Memory: minimum 8 MB, hard drive * * ≥ 10 MB**

Function: Real time monitoring, alarm, historical record, chart, configuration download, remote upgrade

Installation requirements

Transmitter: horizontally installed on a 1.5-inch NPT full bore gate valve, preferably with a cooler return oil pipe and pump outlet

Controller: No vibration structure, good grounding, cable shielded by metal conduit

Communication line: shielded twisted pair, maximum length 1300 meters

Alarm and output

Alarm type: Gas Hi, Gas Hi Hi Hi, Fail (power/communication/sensor failure)

Contact: SPDT (Type C), 125 VA@250  Vac，60 W@220 Vdc

Analog output: 0-1 mA/4-20 mA/0-1/0-10 V (optional isolated 1500 V RMS)

Standards and Certification

Electromagnetic compatibility: 89/336/EEC, IEEE C37.90, IEC 801-2/3/4, IEC 61010

Key questions and answers

Question 1: What gases can the 1Ti transmitter detect? What is the relative sensitivity of each?

Answer: Can detect H ₂, CO, C ₂ H ₂, C ₂ H ₄; The relative sensitivities are H ₂ (100%), CO (18% ± 3%), C ₂ H ₂ (8% ± 2%), and C ₂ H ₄ (1.5% ± 0.5%), respectively.

Question 2: What are the core differences among the three controllers in the 201Ci series?

Answer: 201Ci-1 is for single channel display and control; 201Ci-4 supports up to 4 transmitters with status LED and expansion interface; 201Ci-C has no display, no output, and no alarm, only used for communication gateway management data forwarding.

Question 3: What are the mandatory requirements for the installation position and installation method of the 201Ti transmitter?

Answer: It must be installed horizontally on a 1.5-inch NPT full bore gate/ball valve, with priority given to the cooler return oil pipe and pump outlet; Ensure good oil flow, ambient temperature of * * -50~+55 ℃, communication cables must be shielded with metal conduits.