Brochure · EN — Brochure for the SITRAM Multisense 5, Siemens Energy's online DGA (dissolved gas analysis) monitor that indicates deviations and evolving faults by analyzing the concentration of 4 dissolved gases (H2, C2H2, CO, C2H4) and moisture in transformer insulating oil (mineral and ester oil). NDIR measurement technology with no consumables or regular maintenance, mounted directly to the transformer on a single free valve (G1½ DIN ISO 228-1 or 1½" NPT ANSI B 1.20.1), compact IP55 aluminum housing with no moving parts, display and keypad for setup without a computer, and Ethernet/RS 485 communication (Modbus; 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 5 helps utilities and industries to prevent transformer failures.
SITRAM Multisense 5 indicates deviations and evolving faults by analyzing the concentration of 4 dissolved gases in transformer insulating oil (mineral and ester oil), and moisture. This helps to predict and prevent the fault types below (the gas-to-fault mapping reformats the brochure's verbatim bullet list). The measurement technology works with no consumables (e.g. reference gas) nor regular maintenance effort.
| Monitored gas | Fault types predicted / prevented |
|---|---|
| C2H4 | High temperature thermal faults, overheated oil |
| H2 | Partial discharge, thermal faults, power discharges, rust, galvanized parts, stainless steel, sunlight |
| CO | Thermal fault involving cellulose, gradually from oil oxidation |
| C2H2 | Hot spot, low energy discharge, high energy discharge (arc) |
Measurement technology NDIR with no consumables (e.g., reference gas) or regular maintenance effort. A display and keypad enable comprehensive configuration and setup without an additional computer, complemented by advanced software on the unit and via PC.
The unit is directly mounted to the transformer — no additional piping, frame or stand required, one-man work — and needs only one free transformer valve (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. The design is compact and robust (IP55) with no moving parts.
Prevention of transformer failures: early fault detection and diagnosis with online dissolved gas analysis (DGA) by monitoring 4 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.
Safety ratings as printed in the brochure:
| Characteristic | Specification |
|---|---|
| Insulation protection | IEC 61010-1:2002 |
| Degree of protection | IP-55, CE Certified |
General electrical, mechanical and environmental data:
| Characteristic | Specification |
|---|---|
| Optional nominal voltages of auxiliary supply | 120 V -20% +15% AC 50/60 Hz (1) or 230 V -20% +15% AC 50/60 Hz (1) or 120 V -20% +15% DC (1) or 230 V -20% +15% DC (1); other nominal voltages on request |
| Power consumption | max. 400 VA |
| Housing | Aluminum - IP55 |
| Dimensions | W 263 x H 263 x D 327.5 mm |
| Weight | approx. 13.5 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 |
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: near-infrared gas sensor unit for CO, C2H2 and C2H4; micro-electronic gas sensor for H2; thin-film capacitive moisture sensor for H2O; temperature sensors for oil and gas temperature.
Measuring ranges and accuracies per gas, as printed. Footnotes: (2) according 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.
| Gas | Range | Accuracy (3) | Expected Operational LDL and Accuracy (4) |
|---|---|---|---|
| H2 | 5 … 2,000 ppm | ±5% ±5ppm (2) | ±15% ±25ppm |
| C2H2 | 1 … 2,000 ppm | ±5% ±1ppm (2) | ±20% ±5ppm |
| CO | 20 … 5,000 ppm | ±5% ±20ppm (2) | ±20% ±25ppm |
| C2H4 | 1 … 10,000 ppm | ±5% ±1ppm (2) | ±20% ±10ppm |
| H2O | 1 … 100 % | ±3% ±1ppm (2) | ±3% ±3ppm |
Analogue and digital outputs:
| Quantity | Type | Range / Control Voltage |
|---|---|---|
| 5x | Analogue Outputs | 0/4 … 20 mADC |
| 5x | Digital Outputs | 12 VDC |
Ethernet 10/100 Mbit/s copper-wired / RJ45 or fiber-optical / SC Duplex (proprietary or MODBUS TCP protocol); RS 485 (proprietary or MODBUS RTU/ASCII protocol); optional: GSM, DNP3, IEC 61850.
Supply-voltage note (1) as printed: 120 V → 120 V -20% = 96 Vmin, 120 V +15% = 138 Vmax; 230 V → 230 V -20% = 184 Vmin, 230 V +15% = 264 Vmax.
Click any figure to enlarge.