STA1218 Series Three-Phase Current Transformer

• Application: Electronic, Instrument
• Type: Current Transformer
• Phase: Three
• Operation Condition: Outdoor
• Usage: Protection
• Winding Form: Single Layer & Tightly Wound Type
• Insulating Medium: Epoxy Resin
• Installation: Busbar Type
• Magnetic Circuit Structure: Combined Type
• Voltage Transformation Principle: Electromagnetic Type
• Transport Package: Carton
• Specification: 38.5*22*22cm
• Trademark: Bingzi
• Origin: China
• HS Code: 8504311000
• Production Capacity: 10000000per Year

Product Description

1.Features: 
Fully enclosed, good environmental resistance, strong insulation and isolation capabilities, moisture-proof and shock-proof, and beautiful appearance;
Different colors of the secondary lead wires of the current transformer facilitate the distinction of terminals with the same name;
The use of combined transformers saves more space in the table than the same number of single transformers .

2.Ambient Conditions:
Ambient temperature: -55ºC~+85ºC;
Relative humidity: ≤90% at 40ºC;
Atmospheric pressure: 860~1060mbar(about 650~800mmHg).

3.Operating Frequency Range : 20Hz~1kHz

4.Insulation Thermal Class: Class B (130°C)

5.Safety Features:
Insulation resistance: >1000MΩ in normal condition;
Insulation withstand voltages: 6KV 50Hz/1min.
Fire retardancy: In conformity with UL94-V0.

6.Outline Drawing, Installation Dimension and Coil Diagram: ( tolerance ± 0.5mm )
Outline drawing and installation dimensions are shown in Figure 1 :

Note: The lengths of both the input and output leads can be customized according to customer requirements.
 The coil diagram is shown in Figure 2 :

7. Performance Parameters:
See the table below for performance parameters when applied as shown in Figure 3:

Model	Rated Input Current	Rated Output Current	Rated Sampling Resistance	Rated Sampling Voltage	Phase Shift	Non-linearity	Linear Range
STA1218-01M	10A	10mA	150Ω	1.5V	≤25'	≤0.2%	≥2 times of  the rated value
STA1218-02M	20A	10mA	300Ω	3.0V	≤20'	≤0.2%	≥2 times of  the rated value
STA1218-03M	30A	10mA	450Ω	4.5V	≤15'	≤0.2%	≥2 times of  the rated value

Notes:
a. In practical applications, the sampling resistance should be less than or equal to the rated value given in the above table, which will improve the nonlinearity and phase shift;
b. If the conversion ratio required by the user is different from the above, it can be customized according to the user's requirements.

8. Attention:
 Connect the primary winding of the current transformer in series in the circuit under test. Operate the secondary winding approximately in a short-circuit state.
 Do not allow the secondary circuit of the current transformer to be open-circuited. Do not install any fuses in the secondary circuit.