Hydrocal 1008 Offshore

Hydrocal 1008 Offshore 

The HYDROCAL 1008 Offshore is a permanently installed multi-gas-in-oil analysis system with transformer monitoring functions:

It individually measures the most relevant gases dissolved in transformer oil, such as:

• Hydrogen (H₂)
• Carbon Monoxide (CO)
• Carbon Dioxide (CO₂)
• Methane (CH₄)
• Acetylene (C₂H₂)
• Ethylene (C₂H₄)
• Ethane (C₂H₆)

Furthermore, it measures moisture (H₂O) present in dielectric oil.

The HYDROCAL 1008 Offshore is specially designed for the harsh conditions (saltwater, corrosion) on offshore platforms (e.g. offshore windmill parks). A special painted housing with no window and chrome-nickel and stainless steel application ensure the device's reliability and persistence.

The device can serve as a compact transformer monitoring system by the integration/connection of other sensors present on a transformer via its optional analog inputs:

• 4 analog inputs 0/4 ... 20 mADC
• 6 analog inputs 0/4 ... 20 mAAC +20% or 0 ... 80 VAC +20% (configurable by jumpers)

Hydrocal 1008 is further equipped with digital outputs for the transmission of alerts or the execution of control functions (e.g. control of a cooling system of a transformer):

• 5 digital relay outputs
• 5 digital optocoupler outputs (option)

Key Advantages

• Individual measurement of Hydrogen (H₂), Carbon Monoxide (CO), Carbon Dioxide (CO₂), Methane (CH₄), Acetylene (C₂H₂), Ethylene (C₂H₄) and Ethane (C₂H₆)
• Moisture in oil (H₂O) measurement
• Special design for offshore applications:
• Housing without window painted in C5M
• Backplate with cable glands (chrome-nickel steel, IP 68, corrosion-free and acid-resistant)
• Backplate, oil entrance and housing screws made of stainless steel V4A
• Easy to mount on a transformer valve (G 1½" DIN ISO 228-1 or 1½" NPT ANSI B 1.20.1)
• Installation on the operational transformer without any operational interruption
• Advanced software (on the unit and via PC)
• Maintenance-free system
• Communication interfaces ETHERNET 10/100 Mbit/s (copper-wired / RJ 45 or fibre-optical / SC Duplex) and RS 485 to support MODBUS^®RTU/ASCII, MODBUS^ÒTCP, DNP3 proprietary communication and IEC 61850 protocols
• Optional 2G/3G modem with external adhesive antenna
• Optional DNP3 serial modem for SCADA connection
• Optional IEC 61850 modem for SCADA connection
• Optional HV and LV bushing sensors for HV and LV bushing monitoring applications via communication interface

Transformer monitoring functions

The Hydrocal 1008 Offshore can be used as a complete monitoring system for the condition of the transformer. The main monitoring options are listed below:

Voltages and currents

• via voltage and current transformers/transducer

Temperature Monitoring

• Bottom and top oil temperature, ambient temperature (via additional temperature sensors)

Cooling Stage / Tap Changer Position

• (e.g. via current transducer)

Free configuration

• Analog inputs can be free allocated to any additional sensor

Further calculations:

• Hot-Spot
• Loss-of-Life
• Ageing Rate

HV and LV Bushing monitoring functions (option)

The Bushing Monitoring system simultaneously monitors the bushing leakage current of two rows of three-phase groups of bushings. The system incorporates three different measurement modes on each tested component to provide accurate power factor and capacitance values to evaluate the condition of bushing insulation.

The measurement modes are the following:

• Phase comparison: Compares the power factor of tested components with other tested components energised with the same phase voltage.
• Sum of three current tests: Measures the imbalance current from the summation of A, B and C phase currents from three tested components such as the three HV or LV bushings on the transformer.
• Adjacent phase reference test: Compares the power factor of the tested components with other phase components on the same equipment.

The bushing sensors/adapters are connected to the capacitor taps designed for all bushings to allow measurement of the leakage current up to 140 mA. The adapters are designed for bushings with grounded and undergrounded capacitor taps. The adapter is designed to prevent voltage from developing if the sensor is disconnected from the Bushing Monitoring system.

High and low voltage monitoring

Different bushing sensor configurations are possible:

• Monitoring of high-voltage side
• Monitoring of high- and low-voltage side
• Reference HV bushing from other transformers
• Reference CCVT / CCPT

 Configuration with 3, 6, 9 or 12  bushing sensors is possible.

HydroSoft PC-Software

Program key features

• Configuration and administration of each HYDROCAL unit
• Data and configuration readout of HYDROCAL units
• Processing and presentation of data readout (trend or table)
• Online functions (online sensors, extraction status and process flow)
• Diagnostic functions (Duval triangle and Rogers 3D graphic)
• Further processing of the processed data (Excel, CSV, clipboard and printing)
• Storage of the processed data and unit configuration

Key Features

• 230V AC or 110V DC supply
• Connection to valve: NPT 1” ½ or DIN-ISO 1” ½
• Degree of protection: IP55
• 5 digital relay outputs (220 VDC/VAC / 2 A / 60 W)
• 5 current DC 4-20 mA
• Communication: RJ45 RJ 45 or multimodal fiber-optic with SC Duplex (ETHERNET or MODBUS^® TCP protocol)
• Version suitable for corrosive environments painted C5M, V4A stainless steel and IP 68 chrome-nickel cable glands, corrosion-free and acid-resistant

Operation principle

• Miniaturised gas sample production based on headspace principle (no membrane, negative pressure proofed)
• Patent-pending oil sampling system (EP 1 950 560 A1)
• Near-infrared gas sensor unit for CO, C₂H₂ and C₂H₄
• Near-infrared gas sensor unit for CO₂, CH₄ and C₂H₆
• Micro-electronic gas sensor for H₂
• Thin-film capacitive moisture sensor H₂O
• Temperature sensors (for oil and gas temperature)