Guaranteed Technical Particulars for 33 KV Metering Unit
Sl No.
1
2
3
4
5
6
7
8
Characteristics
Didders Data
I: POTENTIAL TRANSFOMER -33 KV
28
Type & Make
Rated Primary Voltage
33 KV
Rated Secondary Voltage
110 V
No. of Secondary Winding
3
Rated burden of each phase
50 VA
Accuracy class
0.5
Class of insullation
Class-A
Temperature rise at 1.1 times rated voltage with As per IS 3156 Part 1/78
rated burden
Rated voltage factor
1.2 cont
Ratio and phase angle error
As per IS 3156
One minute power frequency withstand test
70 KV RMS
voltage
Impulse withstand test voltage
170 KV peak
II: CURRENT TRANSFORMER:
Rated voltage
33 KV
Rated Primary Current
5 Amp & 1 Amp
Rated Secondary Current
5 Amp & 1 Amp
No of Core
3 in 3 CT Type.
Rated output accuracy class and accuracy limiting 0.5
voltage
Secondary voltage knee point voltage secondary <=5
limiting voltage /ISF
Rated burden
15 VA
1 minute power frequency withstand test
70 KV RMS
Impulse test voltage
170 KV peak
Ratio and phase angle error
As per IS 2705.
III.ROOF BUSHING
Type & Make
Out door , Reputed indigeneous make
As per IS: 2099/73
Dry flash over voltage
Wet flash over voltage
Dry 60 sec withstand voltage
Under oil flash over or puncture withstand test
voltage (Power frequency)
Full wave impulse withstand test voltage with 1.
29
30
Creepage distnace in polluted air
Corona shield provided or not
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
N.R
Sl No.
Characteristics
Didders Data
TRANSFORMER OIL
Clear transparent & free from suspended matter
0.812
31
32
Density at 270 C (max)
33
Kinematics viscocity at 270 C (max)
34
35
36
37
38
39
40
41
42
43
44
45
a
Apperance of oil
0
11.680
Interfacial tension at 27 C (min)
Flash point , pensky marten closed ( min)
Pour point (max)
Neutralization value
a. Total acidity (max)
b. Inorganic acidity / alkalinity 99
Corrosive sulphur
Electric strength ( break down voltage ) (min)
a. New unfiltered oil
b. After filteration
Dielectric dissipation factor
Specific resistance (resistivity)
0.047
a. At 900 C (MIN)
432 x1012
+
152.000
-27.000
NIL
NIL
Non corrosive
30 KV
70 KV
0.000
b. At 270 C (MIN)
Oxidation stability
a. Neutralization value after oxidation
0.031
b. Total slude , after oxidation (max)
0.025
Ageing characterstics after accelerating ageing ( )
open breaker method with copper catalyst for 96
hrs.
Specific resistance (resistivity)
i. At 270 C (Min)
145x10 12
ii. At 900 C (Min)
b
Dielectric dissipation factor. Tan delta at 900 C
40x10 12
0.003
c
Total acidity (max)
Total sludge value (max)
Presence of oxidation inhabiter
Water content (max)
Total weight
Mounting details
Overall dimension
0.025
0.009
Absent
12
380 Kg
500x500 mm mounting hole
1490x1010x11000 mm
46
47
48
49
50
Guaranteed Technical Particulars for 11 KV Metering Unit
Sl No.
1
2
3
4
5
6
7
8
Characteristics
Didders Data
I: POTENTIAL TRANSFOMER -11 KV
28
Type & Make
Rated Primary Voltage
11 KV
Rated Secondary Voltage
110 V
No. of Secondary Winding
3
Rated burden of each phase
50 VA
Accuracy class
0.5
Class of insullation
Class-A
Temperature rise at 1.1 times rated voltage with As per IS 3156 Part 1/78
rated burden
Rated voltage factor
1.2 cont
Ratio and phase angle error
As per IS 3156 Part 1/78
One minute power frequency withstand test
28 KV RMS
voltage
Impulse withstand test voltage
75 KV peak
II: CURRENT TRANSFORMER:
Rated voltage
11 KV
Rated Primary Current
15/5/3/2/1 Amp.
Rated Secondary Current
5 Amp & 1 Amp
No of Core
3 in 3 CT Type.
Rated output accuracy class and accuracy limiting 0.5
voltage
Secondary voltage knee point voltage secondary <=5
limiting voltage /ISF
Rated burden
15 VA
1 minute power frequency withstand test
28 KV RMS
Impulse test voltage
75 KV peak
Ratio and phase angle error
As per IS 2705.
III.ROOF BUSHING
Type & Make
Out door , Reputed indigeneous make
As per IS: 2099/73
Dry flash over voltage
Wet flash over voltage
Dry 60 sec withstand voltage
Under oil flash over or puncture withstand test
voltage (Power frequency)
Full wave impulse withstand test voltage with 1.
29
30
Creepage distnace in polluted air
Corona shield provided or not
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
N.R
Sl No.
Characteristics
Didders Data
TRANSFORMER OIL
Clear transparent & free from suspended matter
0.812
31
32
Density at 270 C (max)
33
Kinematics viscocity at 270 C (max)
34
35
36
37
38
39
40
41
42
43
44
45
a
Apperance of oil
0
11.68
Interfacial tension at 27 C (min)
Flash point , pensky marten closed ( min)
Pour point (max)
Neutralization value
a. Total acidity (max)
b. Inorganic acidity / alkalinity 99
Corrosive sulphur
Electric strength ( break down voltage ) (min)
a. New unfiltered oil
b. After filteration
Dielectric dissipation factor
Specific resistance (resistivity)
0.047
a. At 900 C (MIN)
432 x1012
152.000
-27.000
NIL
NIL
Non corrosive
30 KV
70 KV
0.000
7421x1012
b. At 270 C (MIN)
Oxidation stability
a. Neutralization value after oxidation
0.031
b. Total slude , after oxidation (max)
0.025
Ageing characterstics after accelerating ageing ( )
open breaker method with copper catalyst for 96
hrs.
Specific resistance (resistivity)
i. At 270 C (Min)
145x10 12
ii. At 900 C (Min)
b
Dielectric dissipation factor. Tan delta at 900 C
40x10 12
0.003
c
Total acidity (max)
Total sludge value (max)
Presence of oxidation inhabiter
Water content (max)
Total weight
Mounting details
Overall dimension
0.025
0.009
Absent
12
180 Kg
500x270 mm mounting hole
900x700x720 mm
46
47
48
49
50