Brochure · EN — Brochure for the SITRAM Multisense 9, Siemens Energy's online multi-gas DGA (Dissolved Gas Analysis) monitor that analyzes the concentration of eight dissolved gases (H2, C2H2, CO, CO2, CH4, C2H4, C2H6, O2) and moisture in transformer insulating oil (mineral and ester oil) to indicate deviations and evolving faults. Headspace-principle sampling with a patent-pending oil sampling system, NDIR and micro-electronic gas sensors with no consumables or moving parts, direct one-man mounting on a single free transformer valve (G1½ DIN ISO 228-1 or 1½” NPT ANSI B 1.20.1), aluminum IP55 housing rated -55 °C … +55 °C ambient, and Ethernet/RS 485 Modbus communication (optional GSM, DNP3, IEC 61850).
In their average lifetime of 40 years, transformers endure various forms of stresses that can result in different kinds of failures (electrical, thermal, chemical, or mechanical). Transformer failures may cause e.g. costly damages of primary and secondary equipment, outages, environmental cleanup charges and a loss of reputation.
DGA (Dissolved Gas Analysis) monitoring with SITRAM Multisense 9 helps utilities to prevent transformer failures.
SITRAM Multisense 9 indicates deviations and evolving faults by analyzing the concentration of eight dissolved gases in transformer insulating oil (mineral and ester oil), and moisture. This helps to predict and prevent the fault types listed below (each fault pattern is tied to the gas monitored).
| Monitored gas | Fault types indicated |
|---|---|
| C2H4 | High temperature thermal faults, overheated oil |
| H2 | Partial discharge, thermal faults, power discharges, rust, galvanized parts, stainless steel, sunlight |
| CH4 | Corona partial discharge, low & medium temperature thermal faults |
| CO | Thermal fault involving cellulose, gradually from oil oxidation |
| CO2 | Normal aging, thermal fault involving cellulose |
| C2H2 | Hot spot, low energy discharge, high energy discharge (arc) |
| C2H6 | Low & medium temperature thermal faults, local overheating |
| O2 | Exposure to atmosphere (air), leaky gasket (under vacuum), air breathing conservator, leaky bladder |
Measurement technology with no consumables (e.g., reference gas) or regular maintenance effort. A display and keypad enable comprehensive configuration and setup without an additional computer, and advanced software runs both on the unit and via PC.
The unit is directly mounted to the transformer — no piping, no frame or stand, one-man work — and only one free transformer valve is required (G1½ DIN ISO 228-1 or 1½” NPT ANSI B 1.20.1). There is no operational interruption of the transformer during installation and commissioning.
Robust, NDIR measurement technology without moving parts or reference gas, in a compact design with no moving parts.
Prevention of transformer failures: early fault detection and diagnosis with online dissolved gas analysis (DGA) by monitoring 8 fault gases and moisture.
Easy installation: directly mounted to transformer, only 1 free flange required, no additional piping, frames or stands required.
Easy operation: no consumables, no periodic maintenance.
General electrical, mechanical and environmental data as printed in the brochure. Note 1) defines the supply tolerance bands: 120 V → 120 V -20% = 96 Vmin, 120 V +15% = 138 Vmax; 230 V → 230 V -20% = 184 Vmin, 230 V +15% = 264 Vmax.
| Characteristic | Specification |
|---|---|
| Optional nominal voltages of auxiliary supply | 120 V -20% +15% AC 50/60 Hz or 230 V -20% +15% AC 50/60 Hz or 120 V -20% +15% DC or 230 V -20% +15% DC; other nominal voltages on request |
| Power consumption | max. 600 VA |
| Housing | Aluminum – IP55 |
| Dimensions | W 263 x H 263 x D 327.5 mm |
| Weight | approx. 15 kg |
| Operation temperature (ambient) | -55°C … +55°C; below -10°C display function locked |
| Oil temperature (in the transformer) | -20°C … +90°C |
| Storage temperature (ambient) | -20°C … +65°C |
| Oil pressure | 0 – 800 kPa |
| Supported fluids | Mineral oil; synthetic ester on request |
| Connection to valve | G1½ DIN ISO 228-1 or 1½” NPT ANSI B 1.20.1 |
| Characteristic | Specification |
|---|---|
| Insulation protection | IEC 61010-1:2002 |
| Degree of protection | IP-55, CE Certified |
Miniaturized gas sample production based on the headspace principle (no membrane, negative pressure proofed), with a patent-pending oil sampling system (EP 1 950 560 A1).
Sensing chain: a near-infrared gas sensor unit for CO, C2H2 and C2H4; a near-infrared gas sensor unit for CO2, CH4 and C2H6; a micro-electronic gas sensor for H2 and O2; a thin-film capacitive moisture sensor (H2O); and temperature sensors for oil and gas temperature.
Measuring ranges and accuracies per gas as printed. Brochure footnotes: (2) according to headspace extraction method described in IEC 60567:2011; (3) accuracy of the detectors during calibration process under controlled laboratorial conditions; (4) related to temperatures ambient +20°C and oil +55°C, considering mineral oil type without ageing factors and additives. All values in the Accuracy column carry footnote (2) in the original.
| Gas | Range | Accuracy (3) | Expected operational LDL and accuracy (4) |
|---|---|---|---|
| H2 | 5 … 10,000 ppm | ±5% ±5ppm | ±15% ±25ppm |
| C2H2 | 1 … 10,000 ppm | ±5% ±1ppm | ±20% ±5ppm |
| CO | 20 … 10,000 ppm | ±5% ±20ppm | ±20% ±25ppm |
| CO2 | 20 … 20,000 ppm | ±5% ±20ppm | ±20% ±25ppm |
| CH4 | 1 … 5,000 ppm | ±5% ±1ppm | ±20% ±25ppm |
| C2H4 | 1 … 10,000 ppm | ±5% ±1ppm | ±20% ±10ppm |
| C2H6 | 1 … 10,000 ppm | ±5% ±1ppm | ±20% ±15ppm |
| O2 | 1,000 … 50,000 ppm | ±10% ±1000ppm | ±10% ±1000ppm |
| H2O | 1 … 100 % | ±3% ±1ppm | ±3% ±3ppm |
| Quantity | Type | Range / Control voltage |
|---|---|---|
| 10 x | Analogue outputs | 0/4 … 20 mADC |
| 10 x | Digital outputs | 12 VDC |
Ethernet 10/100 Mbit/s copper-wired (RJ45) or fiber-optical (SC Duplex), with proprietary or MODBUS TCP protocol.
RS 485 with proprietary or MODBUS RTU/ASCII protocol.
Optional: GSM, DNP3, IEC 61850.
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