Gassing Transformers Which Have Been Degassed; Transformers With An Unstable Gassing History Which Have Not Been Degassed; Viewing Gas-Guard Data; Table 4: Recommended Caution/Alarm Settings For Gassing Transformers After Degassing - Siemens GAS-Guard 8 Operation And Maintenance Manual

810-1734-00 Rev A

Gassing Transformers which have been degassed:

Set the caution level to 50% and the alarm level to 100% of the low-end CAUTION ppm limits
proposed by IEEE PC57.104 Draft 11, published April 21, 2004; except acetylene, as noted below.
Gas
Hydrogen
Methane
Acetylene
Ethylene
Ethane
Carbon Monoxide
Carbon Dioxide
Oxygen

Table 4: Recommended caution/alarm settings for gassing transformers after degassing

Transformers with an unstable gassing history which have not been
degassed:
There are no recommendations possible for transformers in this category. In order to establish the
caution and alarm levels, allow the GAS-Guard to run for thirty (30) days to establish gassing trends
and baseline measurements. After this data has been collected, you should consult with Siemens
(support@serveron.com) to determine the appropriate caution and alarm settings for the transformer.

Viewing GAS-Guard Data

The GAS-Guard data can be viewed using the supplied GAS-Guard View software or the optional
Serveron Monitoring Service Client software. A copy of the GAS-Guard View software and user's
manual can be found on the CD that shipped with the GAS-Guard. Alternatively, the GAS-Guard can
present data to SCADA systems using DNP3 or Modbus protocols. Please contact a Siemens
representative for further information regarding the Serveron Monitoring Service or to integrate the
GAS-Guard with a SCADA system
GAS-Guard 8 and GAS-Guard 3 Operations and Maintenance Guide
Caution PPM
50
60
2
25
33
175
1750
baseline+10%
7 of 18
Alarm PPM
100
120
5
50
65
350
3500
Baseline+20% above initial measured PPM
Notes:
Per Draft 11