GE Hydran 201i - Hydran 201 Ti and 201 Ci Controller Verification

Page 197
Hydran* 201i Instruction Manual
MA-033 Rev. 14.0, 12-Nov-18
The Hydran 201i System gives a composite reading of the first four gases in the
above list, in other words the gases generated by transformer incipient faults. This
reading can be compared to the DGA results using the following formula:
H201Ti reading = 100 % [H
2
] + 18 % [CO] + 8 % [C
2
H
2
] + 1.5 % [C
2
H
4
]
A few examples are given in Table 14-2. The difference between the actual and the
calculated readings should fall within the technical specifications of the Hydran 201i
System.
Dissolved Gas Analysis (DGA) (ppm)
H201Ti
Reading
(ppm)
Hydrogen
(H
2
)
Carbon
Monoxide (CO)
Acetylene
(C
2
H
2
)
Ethylene
(C
2
H
4
)
100
0
0
0
100
100
1000
0
0
280
100
100
0
0
118
100
100
50
0
122
100
100
50
200
125
Table 14-2: Examples of Gas Reading Comparisons between a DGA and a Hydran 201Ti
14.7 Hydran 201Ti Verification
Frequency: Annually or on fail alarm
Note: Alarms are triggered during this verification procedure. Please warn the appropriate
personnel.
Read the precautions listed in Section 6.1 before handling the
Hydran 201 sensor.
The H201Ti is verified as follows:
1. Check for oil leaks.
2. If necessary, clean and retighten the brass adaptor and the H201 sensor.
3. Check for loose connections on the terminal blocks and connectors. Retighten if
necessary.
CAUTION