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Zero Phase CT

Inquiry

The zero phase CTs are differential sensors passing both line & grounded neutral conductors into the CT aperture so as to make a zero phase sequence in the case of leakage current or fault current on the line. So it is called the differential current as the sensitivity current distinguished from the primary current. The valuable advantage of Taehwatrans CTs is the minimal noise that enables the CT to sense very low current along with almost zero load shift under hair-pin test environment. It means the CT reading sensitivity, the capability of reading very minimal current flow, is not hardly affected even under a variety of field installation environments while generating the same level of output as our testing lab. Therefore they are used in the ground fault circuit interrupter, appliances leakage circuit interrupter which has rated sensitivity less than 5mA or 6mA and the earth leakage circuit breakers with 15mA or 30mA rated sensitivity current.

Zero Phase CT Features Image

Application

- Residual current circuit breaker (RCCB)
- Earth leakage circuit breaker (ELCB)
- Ground fault circuit interrupter (GFCI)
- Appliance leakage circuit breaker interrupter (ALCI)
- ZCT for energy storage system (ZCT's)


Features

- Minimum output voltage tolerance
- Close to zero load shift
- Minimum noise output at 360 degree hair-pin test.
- Excellent thermal properties in minimal variation


Drawing

TZ47V

Differential-Current-Sensor-Series-01-graph-1

TZ67VA

Differential-Current-Sensor-Series-01-graph-2

TZ68V1

Differential-Current-Sensor-Series-01-graph-3

TG115H

Differential-Current-Sensor-Series-01-graph-4

TG115L

Differential-Current-Sensor-Series-01-graph-5

Electrical Property & Dimension

unit: mm/inch

Specification Spec
Model NO Dimension(mm/inch) Current Rating Sensitivity Current
A(min) B(max) C(max) D(max) E(±0.3) F(±0.3) G(±0.5)
TZ1L 5.9
0.232'
17.4
0.685'
8
0.315'
20.5
0.807'
5.5
0.217'
73
2.874'
3
0.118'
15A-30A 15mA-30mA
TZ53L10 6.9
0.272'
17.1
0.673'
6.7
0.264'
19.1
0.752'
5.2
0.205'
50
1.969'
3
0.118'
15A-30A
TZ1PL 7.3
0.287'
19.1
0.752'
8.1
0.319'
22
0.866'
7
0.276'
73
2.874'
3
0.118'
15A-30A
TZ2L9 8.9
0.350'
22
0.866'
8.2
0.323'
25
0.984'
7
0.276'
120±5.0
4.724'
4.0±0.5
0.157'
30A-50A
TZ3L 9.9
0.390'
24
0.945'
9
0.354'
27
1063'
6
0.236'
73
2.874'
3
0.118'
50A-75A
TZ3PL 12.5
0.492'
26.2
1.031'
9
0.354'
29
1.142'
6.45
0.254'
120±5.0
4.724'
4.0±0.5
0.157'
50A
TZ4L 15.5
0.610'
30.35
1.195'
9.2
0.362'
33.4
1.315'
6.3
0.248'
73
2.874'
3
0.118'
100A
TG115L 7.1
0.279"
18.8
0.740"
6.7
0.264"
21.5
0.846"
7.2
0.283"
39±3
1.535"
5±3
0.197"
60A 4mA-6mA
TZ5L 19.4
0.764"
40.5
1.594"
10
0.394"
43.5
1.713"
12.1
0.476"
87
3.425"
6
0.236"
100A-150A
TZ6T 22.5
0.886"
40.3
1.587"
12.7
0.500"
43.5
1.713"
17±1.0
0.669"
70
2.758"
6
0.236"
150A
TZ8T 33
1.299"
57.4
2.260"
18.2
0.717"
57.8
2.276"
19±1.0
0.748"
80
3.150"
6
0.236"
225A
TZ11T 72
2.835"
102
4.016"
15
0.591"
105.5
4.154"
22±2.0
0.866"
150
5.906""
3
0.118"
800A-1200A
TZ42T 48.5
1.909"
75.4
2.969"
15
0.591"
77
3.031"
22±2.0
0.866"
103
4.055"
6
0.236"
400A

L : Lead Wire Type

T : Outer Shied Type



unit: mm/inch

Specification Spec
Model NO Dimension(mm/inch) Current Rating
A(min) B(max) C(max) D(max) E F(max) G H
TZ1H 5.7
0.224'
17.4
0.685'
8
0.315'
17.3
0.681'
11.2
0.441'
17.4
0.685'
6± 1.0
0.236'
  15A-30A
TZ1H3 6.1
0.240'
17.1
0.673'
7
0.276'
18.2
0.717'
10.3
0.406'
17.1
0.673'
2.75
0.108'
 
TZ53H 6.9
0.272'
17.1
0.673'
6
0.236'
19.1
0.752'
5.2
0.205'
3±0.3
0.118'
6±3.0
0.236'
 
TG4H2 6.3
0.248"
17.1
0.673"
6.7
0.264"
17.3
0.681"
12.4
0.488"
15.5
0.610"
5
0.197"
  20A-30A
TZ67VA 5.7
0.224"
19.5
0.767"
8.6
0.338"
19.2
0.756"
12.7±0.3
0.5"
16±0.3
0.630"
3
0.118"
7.5
0.295"
30A-60A
TZ68V1 5.7
0.224"
19.2
0.756"
8.2
0.323"
19.2
0.756"
12.7
0.5"
1.2±0.1
0.047"
4.9
0.193"
 
TG115H 6.3
0.248"
15.5
0.610"
6.7
0.264"
17.3
0.681"
12.4
0.488"
  5±0.3
0.197"
 

* V : Vertical Orientation
* H : Horizental Orientation

Electrical Properties

Based on TZ1L

Electrical Properties
Output Voltage Properties Vo=15mV (at Io=25mA, R=1kΩ,f=60Hz)
Remanence Magnetism T=10% Max ( at Idc=50AT)
Thermal Properties 200A ~ 1500A
Hair-Pin Properties V" = 6mV max ( at IL=30A )
Pulse Width Properties Tp=2.5m sec min( at Vo = 15mV level )

1. Output voltage properties is measured after demagnetized.
2. Remanence magnetism: Variation of the output voltage between normal CT's and sataurated CT's.
3. Thermal properties: Variation of the output voltage from -10℃ to +65℃ at ambient temperature.
4. Hair-pin properties: At the balanced current equivalent to 6 times of the rated current along around 360 degree. V" is the maximum output voltage.
5. Pulse width properties: The wave width at Vo=10mV

Other GFCI CTs

TF115H

Drawing and Electrical Characteriestics1
Electrical Characteristics

Input: 1kHz

Resistance: 14-16Ω

Inductance: 170-310mH

TF115L

Drawing and Electrical Characteriestics2
Electrical Characteristics

Input: 1kHz

Resistance: 14.5-17.5Ω

Inductance: 270-390mH

TF111V

Drawing and Electrical Characteriestics3
Electrical Characteristics

Input: 1kHz

Resistance: 14-19Ω

Inductance: 260-310mH

TU108V

Drawing and Electrical Characteriestics
Electrical Characteristics - Differential

Input: 60Hz 5mA
Burden: 7.2kΩ
Output: 11.9-13.3mV



Electrical Characteristics - Grd / Neutral

Input: 102V / 33kΩ
Burden: -
Output: 1.4ms min Vp 27mV min

Secondary Burden & Output Voltage Graph

graph