Transformer & Reactor
1
Typical limiting values of Sub-station electrical equipment’s. 1. Transformer / Reactor: SL. NO. EQUIPMENT / TEST DATA PERMISSIBLE LIMITS REFERENCE A) Transformer oil a) BDV -At the time of first charging IS – 1866 -During O&M 50 kV (Gap – 2.5 mm) – Minimum IS – 1867 b) Moisture content IS – 1868 -At the time of first charging 15 PPM (Max.) IS – 1869 -During O&M 25 PPM (Max.) IS – 1870 c) Resistivity at 90 degree C 0.1-1012 Ohm-CM (Min.) IS – 1871 d) Acidity 0.2 mg KOH/gm (Max.) IS – 1872 e) IFT at 27 degree C 0.018 N/M (Min.) IS – 1873 f) Tan delta at 90 degree C 0.20 (Max.) IS – 1874 g) Flash point 126 Deg. C (Min.) IS – 1875 B) Vibration level for reactors 200 Microns (Peak to Peak) IS – 1876 60 Microns (Average) IS – 1877 C) Tan delta for bushing at 20 Deg. C 0.007* IEC – 137 D) Capacitance for bushing + 5% variation IEC – 138 E) IR value for winding 1000 M-Ohm By 5.0/10.0 kV Ins. Tester IEC – 139 F) Tan delta for windings at 20 Deg. C 0.007* IEEE/C57.12.90.1980 G) Contact resistance of bushing terminal connectors 10 M. Ohm / Connector NGC.UK Recommendations H) Turret Neutral CT ratio errors 39 IS – 2705 60 kV (Gap-2.5 mm)-Minimum
-
Upload
santhosh-rm -
Category
Documents
-
view
5 -
download
0
description
Transformer & Reactor
Transcript of Transformer & Reactor
-
Typical limiting values of Sub-station electrical equipments.
1. Transformer / Reactor:
SL.
NO. EQUIPMENT / TEST DATA PERMISSIBLE LIMITS REFERENCE
A)
Transformer oil
a) BDV
-At the time of first charging IS 1866
-During O&M 50 kV (Gap 2.5 mm) Minimum IS 1867
b) Moisture content IS 1868
-At the time of first charging 15 PPM (Max.) IS 1869
-During O&M 25 PPM (Max.) IS 1870
c) Resistivity at 90 degree C 0.1-1012 Ohm-CM (Min.) IS 1871
d) Acidity 0.2 mg KOH/gm (Max.) IS 1872
e) IFT at 27 degree C 0.018 N/M (Min.) IS 1873
f) Tan delta at 90 degree C 0.20 (Max.) IS 1874
g) Flash point 126 Deg. C (Min.) IS 1875
B) Vibration level for reactors 200 Microns (Peak to Peak) IS 1876
60 Microns (Average) IS 1877
C) Tan delta for bushing at 20 Deg. C 0.007* IEC 137
D) Capacitance for bushing + 5% variation IEC 138
E) IR value for winding 1000 M-Ohm By 5.0/10.0 kV Ins. Tester IEC 139
F) Tan delta for windings at 20 Deg. C 0.007* IEEE/C57.12.90.1980
G) Contact resistance of bushing
terminal connectors
10 M. Ohm / Connector NGC.UK
Recommendations
H) Turret Neutral CT ratio errors 39 IS 2705
60 kV (Gap-2.5 mm)-Minimum
