460-480 Tyco Electronics, 460-480 Datasheet - Page 130

• Manufacturer Part Number: 460-480
• Description: Voltage Transformer
• Manufacturer: Tyco Electronics
• Series: 460r

Specifications of 460-480

• Turns Ratio: 4
• Transformer Mounting: Chassis
• Voltage Ratio: 480
• Primary Voltages: 480V
• Power Rating: 150VA
• Output Voltage: 120V
• Mounting Type: Foot Mounted
• Transformer Type: Voltage
• Lead Free Status / RoHS Status: na

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Standards
I.
II. Voltage Transformers
There are too many standards to list them all. Those listed are the ones we most commonly
see. It should be understood that standards are not laws but, are suggested guidelines for
users and manufacturers alike. The standards usually suggest test and testing procedures,
as well.
The following is based on U.S.A. standards (C57.13–1993) which is the standard of choice in
the U.S.A.
I.E.C. (International Electrotechnical Commission) is the standard of choice of the
international community.
Current Transformers
Accuracy and Burden – Accuracy is defined for two different types of applications
(metering and relaying).
The following table defines metering accuracy classes.
Standard Accuracy Classes
The limits of transformer correction factor in standard shall be as shown in table.
*For current transformers the 100% rated current limit also applies to the current
corresponding to the continuous thermal current rating factor.
Accuracy statement (0.3, 0.6, 1.2) is not complete unless it is stated at a given burden.
The following table defines the standard burdens for metering and relaying as well.
Applicable Standards/Accuracy Classes
Metering
Accuracy
Class
0.3
0.6
1.2
Current Transformers
a. I.E.E.E./A.N.S.I. Publication C57.13–1993
b. I.E.C. Publication No. 185
c. British Standard Publication BS 3938
a. I.E.E.E./A.N.S.I. Publication C57.13–1993
b. I.E.C. Publication No. 186
c. British Standard Publication BS 3941
Voltage Transformers
(At 100% Rated Voltage)
Minimum
0.997
0.994
0.988
Maximum
1.003
1.006
1.012
Ratio Correction Factors
At 100% Rated Current*
Minimum
0.997
0.994
0.988
Maximum
1.003
1.006
1.012
Minimum
At 10% Rated Current
0.994
0.988
0.976
Current Transformers
Maximum
1.006
1.012
1.024