Page 10 - Vol.34

Tech
Notes
技術專文

圖3、油中氣體追蹤流程圖

Gas detected in relay, EXAMPLES
gas space, or oil Conservator Gas Space
Step 1 Gas detected in oil Gas detected in gas space
Step 2 Data (μL/L): H 2 = 270 Total gas = 1.5%
Compare values with CH 4 = 190, CO = 280, C 2 H 2 = 5,
Table 1
C 2 H 4 = 17, C 2 H 6 = 4
Total dissol ved combustible gas
Table 1 indicates Table 1 indicates Condition Step 3 Table 1 indicates Condition 2 Proceed to Step 4
Condition 1: Normal 2, 3, 4: Problem may exist
Resume normal Resample to find generating Step 4 Resample (see 6.2) indicates Resampl (see 6.2) indicates
surveillance rate: Refer to 6.2 a rate of 20 μL/L/ day and a rate of 0.025%/day and
increasing increasing

Gas space or relay sample: Dissolved in oil: Step 5 Table 3 Table2
Go to Table 2 Go to Table 3 Indicates Condition 2, Interval C, and Procedure 3. Advise
manufacturer; extreme caution; plan outage; resample per interval;
analyze gas space and dissolved gas components (see NOTE 1)
Investigate possible fault type using methods described Step 6 6.6 Key gas: H 2 , CH 4 – Electrical-corona
in 6.6, 6.7.1, or 6.7.2. Recommended initial resampling 6.7.1 Doernenburg (see NOTE 1) fault type: Possible arcing
interval and operating procedure. 6.7.2 Rogers fault type: Case 2 Possible arcing

Adjust sampling interval and operating procedure
based on accumulated data and experience
資料來源：IEEE.C57104-2008

表 3、空間氣體增生率分析 (TCG) 條件判 表 4、總溶解可燃性氣體分析 (TDCG) 條件判斷

TCG TCG rate Sampling intervals and operating TDCG TDCG Sampling intervals and operating
levels (%/day) procedures for gas generation rates levels rate procedures for gas generation rates
(%) (uL/L) (uL/L/
Sampling Operating day) Sampling Operating
interval procedures interval procedures

Condition ≥5 >0.03 Daily Consider removal from Condition >4630 >30 Daily Consider removal from
4 service. 4 service.
0.01 to 0.03 Daily Advise manufacturer. 10 to 30 Daily Advise manufacturer.

<0.01 Weekly Exercise extrem cae <10 Weekly Exercise extrem cae ution.
ution. Analyze for individual gases.
Condition ≥2 to >0.03 Weekly Analyze for individual Condition 1921 to >30 Weekly Plan outage.
3 <5 gases. 3 4630 Advise manufacturer.
0.01 to 0.03 Weekly Plan outage. 10 to 30 Weekly
Advise manufacturer.
<0.01 Monthly <10 Monthly
Condition ≥0.5 to >0.03 Monthly Exercise caution. Condition 721 to >30 Monthly Exercise caution.
2 <2 Analyze for individual 2 1920 Analyze for individual gases.
0.01 to 0.03 Monthly gases. 10 to 30 Monthly Determine load
Determine load dependence.
<0.01 Quarterly dependence. <10 Quarterly

Condition <0.5 >0.03 Monthly Condition ≤720 >30 Monthly
1 1
0.01 to 0.03 Quarterly Continue normal 10 to 30 Quarterly Continue normal operation.
operation.
<0.01 Annual <10 Annual

資料來源：IEEE.C57104-2008 資料來源：IEEE.C57104-2008

化碳：280ppm、二氧化碳：(無建 此外，IEEE.C57104-2008文中亦 包含空間氣體增生率分析(TCG)與
議值)。 說明油中氣體上升率的重要性， 總溶解可燃性氣體分析[H 2 , CH 4 ,

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