LOW VOLTAGE CURRENT TRANSFORMERS
Technical characteristics: Device power which connected to current transformers:
Maximum rated voltage:
720V
Typical application:
Indoor
Continuous operating current:
1,2xln
Test voltage per minute:
4kV
Security coefficient:
5
Rated primary current(In):
30A-5000A
Rated secondery current:
5A
Operating frequency:
50-60Hz
Operating temperature:
-5¡æ/+45¡æ
Thermal rated current:
1th=100xln
(for MSQ-A type lth=60xln)
Dynamic rated current:
ldyn=2.5xln
Devices
Power(VA)
Ammeter
Wattmeter
Cos meter
KWh-meter (active and reactive)
Reactive power control units
Overload relays
Inverse current relays
Secondary thermal relays
0,7 ... 1,5
0,2...5,0
2,0...6,0
0,4...1
12
0,2...6
2
7,2...9
Additional load due to copper cables:
Power losses (VA) at secondery current 5A.
Cable(Cu)
2,5mm2
4,0mm2
6,0mm2
10,0mm2
1m.
2m.
3m.
4m.
5m.
6m.
7m.
8m.
9m.
10m.
0,36
0,71
1,07
1,43
1,78
2,14
2,50
2,86
3,21
3,57
0,22
0,45
0,67
0,89
1,12
1,34
1,56
1,79
2,01
2,24
0,15
0,30
0,45
0,60
0,74
0,89
1,04
1,19
1,34
1,49
0,09
0,18
0,27
0.36
0,44
0,54
0,63
0,71
0,80
0,89
Ratio error of current tyansformers can be guaranteed between 100% and 120% of rated current.
Error class can be 2-3 folding, especially the value of the under half rated current at the application, load current can be taken into consideration between In-1.2In 		Power losses calculation fo cable:
P=I2sn¡Á2¦Ñ/S¡Á56(VA)
¦Ñ=cable length of secondary side(m)
Isn =seconder rated current (A)
S =cross section of cupper cable (mm2)
P =power losses (VA)
Example: Load connected to current transformer is one active and reactive kWh-meter with 4 m and 2,5 mm2 cable is 1+1+1, 43=3,43 VA.So it is necessary to use 5 VA current transformer.
 
 
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Meter & Current Transformer
LOW VOLTAGE CURRENT TRANSFORMERS
MSQ CURRENT TRANSFORMERS
DP CURRENT TRANSFORMERS
DX CURRENT TRANSFORMERS
RED & EMC CURRENT TRANSFORMERS
MR CURRENT TRANSFORMERS
Z.E.T CURRENT TRANSFORMER
DH TOROIDAL TRANSFORMER
Tdgc Tsgc Voltage Regulator
Machine Tool Control Transformer
PANEL METER
DW26 series rotary switches
Selection of typical contact diagrams
DW26GS series Pad-lock type switches
DW30 ROTARY switches SERIES
Dimensions
DT862-4 Series Three-phase KWH Meter
DD282 Single-Phase Kwh Meter
DTS523 Three Phase Four Wire Active Electrical Meter
NSQ CURRENT TRANSFORMERS
CDS CURRENT TRANSFORMERS
D363 D364 CURRENT TRANSFORMERS
OTHER CURRENT TRANSFORMER
SVC Fully Automatic Voltage Regulator
Ups Uninterruptable Power Supply
Summary
Escutcheon plate and handle
Terminal Block
DDS523 Single-phase KWH Meter
ddsy523 Series Electronic Single-phase kwh Meter With A Function Of Advance Payment
DD17 Series Three-Phase kwh Meter
DM CURRENT TRANSFORMERS
MES CURRENT TRANSFORMERS
RCT CURRENT TRANSFORMERS
PR CURRENT TRANSFORMERS
SFT CURRENT TRANSFORMERS
E TYPE POWER TRANSFORMER
AVR Fully Automatic Voltage Regulator
Connection diagram
DW26S Key-lock type switches
Specification and Way of order
DD862 dd862a single-phase KWH meter
DD284 Series Three-phase kwh meter
Dtsy523 (ic Card) Three Phase Electronic Prepayment Kwh Meter
DT8 Series Three-Phase kwh Meter
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Earth Leakage Circuit Breaker
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