Transformer installation instructions
105.
Insulating fluid
105.11 Notes concerning oil sample
An oil sample is a major help in monitoring the quality of
oil filled transformers and reactor coils. Great care should
be taken when the sample is drawn off during transport
to ensure that the test results represent the state of the
transformer.
Please note that we perform and charge for a KWIKSKRENE test every oil sample in order to protect our
equipment from polychlorinated biphenyls.
Please answer the following questions with care.
Make:
FTNR (Product No.):
Customer:
WNR (Job. No.):
Location:
Sample No.:
Year of manufacture:
Date sample taken:
Type:
Type of oil:
Power rating:
Oil temp. when sample taken:
Transformation:
Load when sample taken:
No. Of operations of tap changer:
Sample taken
from:
Oil sample tap
Oil drainage
device.
A 22/31/40
DIN 42 551
Tank:
Top
Load transfer
switch:
LT tank
Expansion tank:
Transformer
Middle
Bottom
LT
Bushing
pocked
Transducer
Execution:
Reason for taking sample:
Fill with new oil on:
Quantity:
(t)
Topped up on:
Quantity:
(t)
Fault on:
Tests desired:
See next page
Test cerificate in
German language
Repaired on:
English language
Oil treatment on:
French language
Routine inspection:
Further information and background:
Sample taker:
Date:
Name in block capitals
Company/Dept.
Tel.
Maintenance engineer responsible:
Acceptance engineer responsible:
Lab Information:
Serial number.:
Date sample received:
Date sample analyzed:
Type of sample vessel:
Alle Rechte vorbehalten
© Siemens AG 1997, EV LT SCN
Special features:
TUMA 105.11 1/2 06.97 de
(Ersetzt TUMA 105.11 1/2 8.93 D)
Transformer installation instructions
General instructions concerning the taking of oil samples
(See also Installation instruction TU MA 105.03)
One liter of oil is required for an oil test; suitable sample bottles may be borrowed form
corresponding Siemens AG branch office.
For oil gas analysis, one liter of oil is required.
* For a PCB test, at least 50 ml of oil is required.
Tap-off point for oil gas analysis: normally top of tank
Tap-off point for other tests: normally bottom of tank
1. Use clean 1-litre bottles with gas-tight closure to hold the sample.
2. Special aluminum bottles with plastic screw caps are generally used. The sample bottles must
close so tightly that no air can be drawn in during cooling.
3. If glass bottles are used, the oil sample should not be drawn off unless you are sure that the
temperature of the sample is higher than or equal to the storage or dispatch temperature. If
not, please consult the test laboratory.
4. Samples for gas analysis should always be taken using the overflow method. The operations
described under 5 and 7 below should be carried out quickly and without interruption so as to
prevent the sample from coming into contact with the atmosphere as far as possible.
5. Method of drawing oil from the oil sample tap
Screw onto the tap o coupling element with seal, hose fitting and oil proof hose (30 to 50 cm
long) turn the tap on and fill the outer vessel with 2 to 3 liters of oil (from the outlet pipe).Insert
the hose in the bottle so that its end is just short of the bottom of the bottle. Turn the tap on and
fill the bottle from the bottom upwards, slowly at first and then quickly until two or three times
the content of the bottle have overflowed into the outer vessel. Finally, reduce the flow from the
tap and, with oil still flowing, pull the bottle downwards off the hose. Seal the bottle immediately.
6. Method of drawing oil from the drainage device A22/31/40 DIN 42 551; this method is not
suitable for gas analysis.
Put the outer vessel (5) under the oil outlet. Use an open-ended spanner to unscrew the cap
(contains some oil) Carefully unscrew the square-headed inner plug screw (6.2) until oil starts
to flow from the outlet (6.3). Rinse the bottle with some oil. Screw the cap (6.1) back on by hand
to stop the oil flow. Fill the bottle (4) almost full by opening the cap (6.1) again. Seal the bottle (4)
and label it.
7. The method of drawing oil from the drainage device A22/32/40 DIN 42 551 with the aid of a length
of hose is analogous to that described under 5 above, the drainage device being operated as
described under 6 above.
8. Dispose the oil in the outer vessel in the proper way.
Fig 1:
Taking an oil sample with oil
sample bottle and outer vessel
1
2
3
4
5
Transformer tank
Oil sampling tap
Hose
Oil sample bottle
Outer vessel
Proposition for routine check
Tests available:
Test
desired
Aging
state
Dryness
state
Fault
free
PCBcontamination
After occurrence of fault or
damage
Used oil Duty to mark
ordinance under PCB
banning
ordinance
Color
DIN ISO 2049
Purity
DIN VDE 0370 Part 1
Neutralization value
DIN 51558
Saponification value
DIN 51559
Loss factor at 90°C
DIN VDE 0370 Part 1
Breakdown voltage
DIN VDE 0370 Part 1
Water content
DIN 51777 Part 1
Oil classification number required
only when PCB < 50 ppm
PCB-preliminary test*
(KWIK-SKRENE quick test) 20 ppm
PCB-preliminary test*
(KWIK-SKRENE-quick test) 50 ppm
PCB –content without
DIN 51527 Part 1
Quick test
PCB –content where quick test> 50 ppm
DIN 51527 Part 1
HALOGEN- or chlorine content DIN 51577 Part 3
Total gas content
Gas analysis
Measuring the gas content and performance of gas analysis are possible only when the oil sample has been drawn off through a hose
without bubbles (see Figs. 1a and 1c)
* PCB-PCB tests in conformity with DIN 51 527, chlorine content tests in conformity with DIN 51577 and gas analysis can be performed
in Nuremberg only.
Alle Rechte vorbehalten
© Siemens AG 1997, EV LT SCN
TUMA 105.11 2/2 06.97 de
(Ersetzt TUMA 105.11 1/2 8.93 D)
Transformer installation instructions
Siemens AG
EV TWN QM
Katzwanger Straße 150
D-90461 Nürnberg
Siemens AG
EV TBD FS
Scharfenberger Str. 66
D-01131 Dresden
Alle Rechte vorbehalten
© Siemens AG 1997, EV LT SCN
Siemens AG
EV TWK QFM
Hegelstraße 20
D-73230 Kirchheim/Teck
Siemens AG
EV TWK SCB
Cruismannstraße 48
D-44807 Bochum - Riemke
TUMA 105.11 2/2 06.97 de
(Ersetzt TUMA 105.11 1/2 8.93 D)