Sf6 analyzer - Transdox 3100C SF6 multigas analyzer

Regular checking of SF₆ gas insulated substations allows fault preventative maintenance programs to be implemented, and increases the life cycle of the SF₆.

The Transdox 3100C is the latest high precision gas analyzer designed for controlling and monitoring the quality of SF₆ in gas insulated sub-stations and circuit breakers. Three different models of the analyzer (CA, CB and CC) not only measures the SF₆ purity over the full range, but depending on model also measures the H₂O content of the SF₆ which is essential when monitoring the dielectric strength of the gas, together with the decomposition gas SO₂ and HF.

The analyzer simultaneously measures SF₆, SO₂, HF and H₂O. Using an infra-red SF₆ detector, the analyzer offers exceptional accuracy and stability when measuring the purity of SF₆. The decomposition products of SF₆ can be identified by analyzing the HF and/or SO₂ content of the gas; this forms from the breakdown of SOF2 and SOF4 after an electrical discharge. The analyzer incorporates two electrochemical, SO₂ and HF sensors to measure ppm levels. The dew-point of the gas (in ppmV or °C) is an important parameter to measure as this has an effect on the dielectric properties of SF₆. The Transdox is fitted with a special high-speed dew-point sensor fitted with a system allowing stable measurements in less than three minutes.

All gases are analyzed and data-logged simultaneously and just a few minutes are required to get a stable reading. The Transdox has both on-board and software-based data-logging for full flexibility. The analyzer has a gas output nozzle allowing all sampled gas to be recovered and recycled, ensuring that no SF₆ gas is released into the atmosphere (in accordance with the Kyoto agreement).

The analyzer can be supplied as a bench style instrument or a full kit in a transport suitcase, with a range of DILO compatible sampling hoses, couplings and a printer. Low-cost SF₆ gas recovery bags are available to ensure no gas escapes into the atmosphere when using the Transdox.

Features:

• Continuous gas sampling of SF₆ - SO₂ - HF - H₂O
• High precision infra-red gas detector for SF₆ purity over the range 0-100%
• Electrochemical SO₂ sensor for trace analysis of contamination gas 0-100ppm or 0-500ppm
• Electrochemical HF sensor for trace analysis of contamination gas 0-10ppm
• High speed dew-point sensor for moisture analysis -65°C to + 20°Cdp (or ppmv)
• Input pressure 0.5 to 10 bar with safety blow off valve
• Gas flow rate 0.1 - 1 litre per minute controlled by flow gauge
• Programmable alarms with outputs and visual warning
• RS232 / RS485, 0-5V and 4-20mA current loop outputs (all user programmable)
• On board data-logger with 2048 sample points
• Windows data logging software with MS-Excel compatible graphing
• Supplied with a 2m armored sampling hose with DILO compatible fittings
• Full sample kit available (sample hoses, DILO couplings, printer, Peli-case)
• SF₆ gas recovery bag available
• Compatible with DILO style gas recovery systems

Applications:

• Controlling SF₆ quality in switches, bus bars and circuit breakers in Gas Insulated Substations (GIS)
• SF₆ insulated devices in power stations
• Checking for the buildup of corrosive decomposition products such as HF and SO₂ present in the SF₆
• Measuring the moisture content of SF₆ gas by using a dew-point analyzer
• Applying a condition based maintenance program (CBM) to extend the life cycle of the SF₆
• Detecting the presence of leaks and SF₆ discharge
• Indication of arcing and breakdown through the buildup of corrosive by-products

Specifications Transdox 3100C SF₆

Technical Data: Analyzer
Voltage	90-260Vac, 50/60Hz
Analyzer dimensions	350mm x 263mm x 150mm
Weight	7 kg
Display	20 x 4 characters (9mm) back lit LCD. Displays SF6-H2O-HF-SO2, pressure, temperature, date & time
Warm up time	3-4 minutes at 20°C
Operating temperature	-10°C to 40°C
Max inlet pressure	10 bar (protected)
Voltage outputs	0-5V linear, user-programmable
Current outputs	4-20mA linear, user-programmable
Digital outputs	RS232 (RS485 option available): data streamed on demand
Flow	100 to 1000 ml.min-1
Data Log	On board data logger with 2048 sample points

Technical Data: Sensor
SF6 Sensor	Infra-Red 0-100%; ± 0.5% FS accuracy; Resolution 0.1%
H2O Sensor	-65°C to +20°Cdp; ± 2°Cdp accuracy of reading*; Resolution 0.1°Cdp
SO2 Sensor	Electrochemical Cell 0-100ppm or 0-500ppm; ± 2% FS accuracy; Resolution 0.1ppm
HF Sensor	Electrochemical Cell 0-10ppm; ± 2% FS accuracy; Resolution 0.1ppm
Life expectancy	2-3 years: HF & SO2, >5 years SF6 & H2O
Measurement time	3-5 minutes
Calibration	SF6, HF and SO2 user selectable cal gas values. H2O sensor factory fixed
* Minimum accurate reading possible with this sensor is -60°Cdp. Sensor will respond from wet to dry in approximately three minutes.

Optional Accessories

• Optional Transdox Gas Recovery Bag
• Optional Transdox Sampling Kit
  • Transdox 3100C analyzer (CA, CB, CC or CD)
  • Handle
  • Set of DN8 and DN20 DILO fittings with 2m hose
  • Thermal printer
  • Heavy duty Peli-style case