GE Hydran H201Ci-1 (H20CI-1) Single-Channel Controller for Online Dissolved Gas Monitoring of Power Transformers

Description

GE Hydran H201Ci-1 (H20CI-1) Single-Channel Controller for Online Dissolved Gas Monitoring of Power Transformers

Core Product Overview

The H201Ci-1 (often written as H20CI-1) is a single-channel remote controller from the GE Hydran product family, designed to pair with the H201Ti intelligent gas transmitter for continuous dissolved gas-in-oil monitoring on oil-filled power equipment. It provides local ppm concentration display, configurable analog outputs, hardware alarm relays and serial communication interfaces. This unit acts as the data hub for one H201Ti sensor, and can be networked to support up to 128 H201Ti transmitters within a single monitoring system. Widely used for early fault detection of transformers, reactors and instrument transformers, it identifies thermal faults, partial discharge and arcing by tracking key fault gases in insulating oil. The product is mature legacy power equipment, commonly stocked as surplus and replacement spare parts for power plants and substations.

H201CI-1

Main Technical Specifications

• Part Number: H201Ci-1 (H20CI-1)
• Product Family: GE Hydran 201
• Device Type: Single-channel remote controller
• Matched Transmitter: H201Ti intelligent dissolved gas transmitter
• Measurement Scale: 0–1999 ppm (0–2000 ppm full scale)
• Display: Digital LED ppm readout
• Analog Outputs:
  • Primary non-isolated output, jumper-selectable: 0–1mA / 4–20mA / 0–1V / 0–10V
  • Optional secondary isolated output, 1500Vrms isolation, same signal ranges
• Alarm Relays: Gas High, Gas High-High, System Fault
• Communication: RS232 local port; RS485 Modbus RTU for network, up to 32 controllers on one bus
• Enclosure Rating: NEMA 4X / IP65, weatherproof for outdoor cabinet mounting
• Operating Temperature: -40°C ~ +55°C
• Humidity: 5%–95% non-condensing
• Power Input: 90–132VAC / 180–264VAC universal AC supply
• Function: Data collection, gas trend logging, alarm latching, status feedback to SCADA
• Status: Obsolete original OEM production, available as surplus, tested refurbished units

Same-Series Model Recommendations (8 Models)

• H201Ti: Intelligent dissolved gas transmitter, primary field sensor paired with H201Ci-1
• H201Ci-2: Dual-channel Hydran controller for two H201Ti transmitters
• Hydran 201R: Integrated remote monitoring assembly combining H201Ci-1 + H201Ti
• Hydran 201D: Multi-channel rack-mounted DGM system for large transformer banks
• H201Ci-0: Basic controller variant without optional isolated analog output
• H202Ci-1: Updated next-generation single-channel gas controller with Ethernet
• Hydran M2: Compact modern dissolved gas monitor for distribution transformers
• Hydran XMT: Standalone field transmitter with local display, no separate controller required

Professional Quality Control & Testing Standard Operating Procedures

All surplus and refurbished H201Ci-1 controllers follow this inspection workflow:

1. Visual & Enclosure Inspection: Check NEMA 4X cabinet, door gasket, terminal blocks, PCB boards, relays and LED display for corrosion, burn marks or water ingress; verify part marking.
2. Power Supply Bench Test: Apply rated AC input and validate stable internal rail voltages, test reverse and overvoltage protection.
3. Display & Keypad Test: Verify LED digits, indicator lamps, alarm setpoint adjustment and menu navigation.
4. Relay Output Test: Trigger High / High-High / Fault alarms to confirm relay pull-in and contact continuity.
5. Analog Output Calibration: Configure 4–20mA / voltage ranges with precision source, calibrate zero and full-scale ppm points.
6. Communication Interface Test: Validate RS232 local communication and RS485 Modbus RTU polling with host simulator.
7. Thermal Soak Test: Operate unit at elevated cabinet temperature to uncover intermittent connection or component drift faults.
8. Final Cleaning & Packaging: Clean PCB and enclosure, replace degraded gaskets if needed, ESD-protected packaging with test report.

New / Refurbished Controller Installation Guidelines

1. Pre-Installation Safety: Isolate all AC supply power with lockout-tagout procedures; confirm transformer oil sampling and sensor circuits are de-energized.
2. Site and Enclosure Check: Select weather-protected cabinet location away from direct solar overheating; inspect cable glands and sealing gaskets.
3. Mechanical Mounting: Secure the NEMA 4X enclosure to rigid panel or substation structure, maintain adequate clearance for wiring and ventilation.
4. Field Wiring: Route AC power, H201Ti sensor cable, analog signal wiring and RS485 bus; separate power and low-signal cables to reduce EMI. Torque terminals to manufacturer values.
5. Configuration: Set ppm scale, alarm threshold values, Modbus node address and analog output mode via front panel.
6. Pre-Commissioning Test: Power on without connecting the H201Ti first, verify no fault codes. Connect transmitter and confirm live ppm reading.
7. System Commissioning: Test alarm relay action, SCADA Modbus polling and analog signal scaling; record baseline gas levels for transformer trend tracking.

H201CI-1

Application Scenarios & Product Features

Typical Application Scenarios

• Online dissolved gas monitoring for high-voltage oil-filled power transformers
• Substation shunt reactors, oil-immersed current and voltage transformers
• Power generation plant main and auxiliary transformers
• Transmission grid critical asset early fault warning
• Retrofit and spare replacement for legacy GE Hydran monitoring systems
• Industrial heavy-load power distribution transformer condition monitoring

Core Product Features

• Single-channel dedicated controller for Hydran H201Ti gas-in-oil sensors
• NEMA 4X weatherproof enclosure suitable for outdoor substation deployment
• Configurable analog outputs and isolated secondary output option for SCADA integration
• Independent hardware alarm relays for gas concentration and system diagnostic faults
• RS485 Modbus RTU networking for multi-transformer monitoring networks
• LED local ppm display for on-site maintenance visibility
• Proven long-term reliability for high-voltage power asset predictive maintenance

Frequently Asked Questions (FAQ)

Q1: What is the difference between H201Ci-1 and H201Ti? A1: The H201Ci-1 is the remote controller unit with display, relays and communication. The H201Ti is the field sensor transmitter mounted on the transformer oil tank that samples dissolved gas. They must work as a matched pair.

Q2: Is the H201Ci-1 still in active production by GE? A2: No. This Hydran 201 series controller is obsolete. Available inventory is surplus used or professionally refurbished and calibrated.

Q3: Can I use this controller with other brands of dissolved gas sensors? A3: No. The communication and sensor protocol are proprietary for the Hydran H201Ti transmitter. It cannot directly interface with third-party DGM sensors.

Q4: What are the common failure modes of H201Ci-1? A4: Common faults include power supply capacitor ageing, failed alarm relays, moisture ingress corroding PCB traces, gasket degradation on the enclosure door, and RS485 transceiver damage from lightning surge.

Q5: Can the controller be powered up while wiring the H201Ti sensor? A5: It is strongly discouraged. Disconnect AC power before connecting or removing the field transmitter cable to avoid communication port surge damage.