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GAS-Guard 1 – Online Transformer Monitor
A revolutionary solution for improving distribution
transformer fleet reliability. The GAS-Guard 1 On-line
Transformer Monitor is the most economical trans­
former DGA condition warning s­ olution ever offered,
providing continuous DGA monitoring of hydrogen gas
along with accurate and timely alarm capability needed
to maintain the reliability of ­distribution transformers
in your fleet.
Key Benefits:
■■ Enables Monitoring of Distribution Transformers
■■ Breakthrough Price/Performance
■■ Low Cost of Ownership
Breakthrough Price/Performance
The GAS-Guard 1 On-line Transformer Monitor offers a
breakthrough price/performance point in on-line DGA. For
the first time, the benefits of on-line condition monitoring
can be realized across the distribution transformer fleet.
Hydrogen gas buildup in transformer oil is an early indicator
of incipient transformer faults. The GAS-Guard 1 continuously
monitors hydrogen PPM Levels and can be programmed to
alarm based on PPM Levels and/or Rate of Change (ROC),
warning operators of potentially disruptive transformer
faults and pending failures. Optional moisture-in-oil and
oil temperature measurements are also available.
Communications
From analog to digital the GAS-Guard 1 provides a
­diverse set of standard communications, allowing
you to send data to local, remote or SCADA users.
Information – See your entire fleet at a glance
Whether you have one monitor or hundreds, whether
you choose to focus on alarm status or near real-time
H2 data, the GAS-Guard 1 provides data management
­solutions for connected and stand-alone monitors.
For networked monitors, the GAS-Guard 1 application
­utilizes an annunciator-style dashboard that provides
­indication of alarming units; selecting a specific unit will
then display hydrogen gas level and trend. Where commu­
nication infrastructure is limited, relay outputs can be used
to indicate alarm conditions. A USB port provides for local
retrieval of H2 data via a USB drive, without the need for
a computer. Data files can be viewed in the GAS-Guard view
­application, or can be viewed in Microsoft Excel or similar
spreadsheet programs.
Low Cost of Ownership
■■ No Membrane
■■ No Sensor Replacement
■■ No Consumables
■■ No Scheduled Maintenance
Designed for user installation, the GAS-Guard 1 delivers
­reliable DGA monitoring that can be deployed throughout
your transformer fleet.
Answers for energy.
GAS-Guard 1 Specifications1)
H2 gas specifications
Certifications/standards
Gas
Hydrogen (H2)
Radiated and Conducted Emissions
Range
20 – 10,000 ppm
Specification
Test Method
Accuracy
±15% or ±20 ppm
Repeatability
±5% or ±10 ppm
EN 61326 Class A:
2002
EN 61326: 2002 Radiated Emissions
Lower Detection
Limit
20 ppm
EN 61326: 2002 Conducted Emissions
Moisture-in-oil & oil temperature (optional)
Parameter
Accuracy
Range
Moisture-in-Oil
±5%
0–100% RS
Oil Temperature
±2°C (typically)
–40°C to +120°C
Alarms
■■ Two (2) alarm relay outputs for power and
­service ­status
■■ Three (3) alarm relay outputs for H2, H2 rate
of change and ­moisture
■■ The relay contact ratings for resistive loads are:
max. switched power 100 W or 600 VA, max.
switched current 3 A, max. switched voltage
150 VDC or 300 VAC
Gas analysis
■■ Sample rate is every 30 minutes
■■ All data is date and time stamped
■■ Minimum of 5 years of data stored in memory
Inputs
RS232 for configuration utility and ­diagnostics
■■ USB Mini B for direct connection with computer
or USB Thumb Drive
■■ Two (2) analog 4–20 mA inputs for optional
­moisture probe
EN 61000-3-2: 2000
EN 61000-3-2: 2000 Current Harmonics
EN 61000-3-3: 2001
EN 61000-3-3: 2001 Voltage Fluctuations
Radiated and Conducted Emissions
Specification
Test Method
EN 61326 Annex A:
2002
IEC61000-4-2: 2001 ESD
IEC61000-4-3: 2002 Radiated Immunity
IEC61000-4-4: 2004 EFT
IEC61000-4-5: 2001 Surge
IEC61000-4-6: 2004 Conducted RF Immunity
IEC61000-4-8: 2001 Magnetic Field Immunity
IEC61000-4-11: 2004 Voltage Dips and
Interrupts
Vibration
IEC 60250-21-1
Safety
IEC 61010-1, IEC 61010-2-81
UL 61010-1 (2nd Edition), UL 60950-1, Clause 6.4
■■ CSA-C22.2 No. 61010-1-04
■■
■■
■■
1)
Specifications are subject to change without notice.
Electrical power
100–240 VAC, 50/60 Hz universal power supply
■■
Communications / outputs
RS232 / RS485
■■ USB 2.0
■■ Three (3) analog 4–20 mA outputs for H2 Level,
ROC and optional Moisture
■■
Protocols: Modbus
Environmental
Operating
Tempe­rature
–50°C to 55°C
Oil Temperature
–20°C to 105°C
Oil Pressure
0 to 7 bar (0 to 100 psi)
Physical specifications
Enclosure
IP66; NEMA 4X
Weight
3.9 kg (8.5 lbs)
Dimensions (HxWxD)
23.4x25.1x28.7 cm (9.2x9.9x11.3 in)
Published by and copyright © 2013:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens AG
Energy Sector
Power Transmission Division
Transformers
Katzwanger Strasse 150
90461 Nuremberg, Germany
For more information, please contact
our Customer Support Center.
Phone: +49 180/524 70 00
Fax:
+49 180/524 24 71
(Charges depending on provider)
E-mail:
support.energy@siemens.com
Power Transmission Division
Order No. E50001-G640-A229-X-4A00
Printed in Germany
Dispo 19200, c4bs No. 7487
TH 101-130073 WÜ 473275 DB 03131.0
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