Unistar PP Type Power Capacitors, Surge Capacitors, Harmonic Filters, LV Power Capacitors, Control Panels, Mumbai, India  Unistar PP Type Power Capacitors, Surge Capacitors, Harmonic Filters, LV Power Capacitors, Control Panels, Mumbai, India  Unistar PP Type Power Capacitors, Surge Capacitors, Harmonic Filters, LV Power Capacitors, Control Panels, Mumbai, India  Unistar PP Type Power Capacitors, Surge Capacitors, Harmonic Filters, LV Power Capacitors, Control Panels, Mumbai, India  Unistar PP Type Power Capacitors, Surge Capacitors, Harmonic Filters, LV Power Capacitors, Control Panels, Mumbai, India  Unistar PP Type Power Capacitors, Surge Capacitors, Harmonic Filters, LV Power Capacitors, Control Panels, Mumbai, India  Unistar PP Type Power Capacitors, Surge Capacitors, Harmonic Filters, LV Power Capacitors, Control Panels, Mumbai, India
 
 

 

Unistar PP Type Power Capacitors

   
 

Unistar PP Type Power Capacitors

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Introduction

Unistar medium voltage All Polypropylene capacitors are proven products of Universal Cables Ltd. Low operating stresses, lower temperature rise and losses make them superior to any other type of capacitors. Absence of paper reduces the chances of gas formation, bulging and bursting. This makes All PP capacitors almost fire proof. These capacitors are best suited for systems which have high and frequent voltage fluctuations and harmonics caused on account of diodes, thyristors and other non-linear loads. Seperate aluminium foil used as electrode, enhances it;'s capacity to withstand high inrush current, associated with parallel switching, likes of which we come across in automatic power factor correction schemes. That is why in industrial applications All PP capacitors are fast replacing Mixed Dielectric and other types of capacitors.

UCL has been making All PP capacitors as per the technology provided by General Electric Co. of U.S.A. So far, these capacitors were made in high voltage range. Now Universal Cables Limited has extended this technology to medium voltage range. Further improvements have been achieved by introducing extended foil design which gives firm internal connection, lower internal resistance and inductance, and high inrush current withstanding capabilities. All the sophistication and care required for high voltage capacitors gets passed on to these capacitors as well, which makes them the most superior capacitors in the medium voltage range.

Manufacturing Process

Unistar All PP dielectric capacitors consists of number of basic elements which are constructed by winding layers of aluminium foil, interleaved by bi-axially oriented polypropylene film. Internal fuses are provided with each element. The winding is carried out in an air conditioned room equipped with special filters to provide dust- free atmosphere, which is very vital for capacitors. Elements thus formed are connected in parallel and then in delta. the complete pack is inserted in a steel case and 3 terminals are brought out through suitable bushings. Capacitors are put under vacuum drying and then impregnated with non-PCB non-toxic oil. After removing from the vacuum tank, units are sealed and then sent for routine electrical testing, painting and assembly. Periodically, few units are taken out from manufacturing process and are subjected to rigorious type testts to ensure quality standards.

Accessories

Capacitor Units are provided with terminal cover to enclose live parts. Entry hole is provided for the bottom entry of the cable. In case of banks, base channel to mount the capacitors, common terminal cover and a set of aluminium busbars are provided. Cable glands are provided on request. 

Mechanical Configuration

Unit Rating in
kvar
Voltage
Rated Current in Amps.
Capacitance between phases in MFD.
Approximate Dimensions
Approx. Weight
Kg.
A
mm
B
mm
C
mm
25
440 V
32.8
205.62
360
165
400
19
415 V
34.8
231.14
360
165
420
20
30
440 V
39.4
246.75
360
165
450
21
415 V
41.7
277.37
360
165
470
22
40
440 V
52.6
329.00
360
215
620
28
415 V
55.6
369.83
360
215
640
29
50
440 V
65.6
411.25
360
215
720
35
415 V
69.6
462.29
3600
215
770
37

Non Standard Kvar and Voltage ratings can be provided on request

Detailed Specifications

Reference Standard

IS  2834  -  1986

Upper Limit of Temperature Category

50 C . As per IS which means
Mean over 1 hour ... 50 C
Mean over 24 hours... 45 C
Mean over 1 year ... 35 C.

Location

Indoor

No. of Phases, frequency

3, 50 Hz

Connection

internal delta

Tolerance
a) Unit
b) Bank

-5% to +10 %
0% to +10%

Discharge

resistors across terminals to discharge to 50 V in less than 60 seconds .

Overload Capacity

110% of the rated voltage or
130% of the rated current or
130% of the rated output.

Protection

Internal element fuses.

Finish

Light grey enamel paint of shade 631 of IS  5

Maximum allowable temperature

15 C above ambient.

Technical Specification

Bank rating in Kvar
Configuration
Bank current in
Amps.
Capacitance between phases in
MFD 
Approximate Dimensions
Approx. Weight
Kg.
No. of
Units
Unit Rating in
Kvar
A
mm
B
mm
C
mm
60
440 V
2   x   30
78.8
439.50
395
390
550
46
415 V
83.4
554.75
395
390
570
48
80
440 V
2   x   40
105.0
658.00
395
390
650
58
415 V
111.2
739.66
395
390
670
60
100
440 V
2   x   50
131.2
822.50
395
390
750
72
415 V
139.2
924.57
395
390
800
76
440 V
4   x   25
131.2
822.50
745
390
500
84
415 V
139.2
924.57
745
390
520
88
120
440 V
3   x   40
157.5
987.00
675
390
740
87
415 V
166.8
1109.50
675
390
760
90
440 V
4   x   30
157.5
987.00
850
390
640
92
415 V
166.8
1109.50
850
390
660
96
125
440 V
5   x   25
164.0
1028.12
1025
390
590
105
415 V
174.0
1155.72
1025
390
610
110
150
440 V
3   x   50
196.8
1233.75
675
390
840
109
415 V
208.8
1386.87
675
390
890
115

 
 


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