460-480 Tyco Electronics, 460-480 Datasheet - Page 131

• 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

Current Transformer Burden Data
Standard Burdens for Current Transformers with 5A Secondary Windings*
* If a current transformer secondary winding is rated at other than 5A, ohmic burdens for
** These standard burden designations have no significance at frequencies other than 60Hz.
There is another factor which must be considered, that is, phase error. The following table
gives the maximum acceptable phase error associated with the standard accuracy classes.
In summary, if you have a metering accuracy statement of "0.3 BO.5" it means the following:
(0.3) maximum ratio error of 0.3% of 100% of rated primary current or ±0.6% ratio error at
10% of rated primary current. With a maximum phase error of ±15 minutes at 100% rated
primary current or ±30 minutes maximum phase error at 10% of rated primary current. All of
the above is based on a burden of (B0.5) 0.5 OHMS at power factor of 0.9.
All relaying accuracies are ±10% maximum ratio error when there is 20 times current flowing
in the CT secondary (20 x 5A=100A). There are two designations, which are "C" and "T".
Designations "C" stands for "Calculate" this type of CT’s performance can be very accurately
calculated. The "T" designation stands for "Test". This type of CT’s performance must be
verified by testing.
The following table gives the relaying accuracy designations:
Current Transformers Relaying Accuracy
Metering
burdens
Relaying
burdens
Burdens
C10 or T100
C20 or T200
C50 or T500
C100 or T100
C200 or T200
C400 or T400
C800 or T800
Accuracy Classes
0.3
0.6
1.2
Designation
specification and rating shall be derived by multiplying the resistance and inductance of
the table [5/(ampere rating)]2, the VA at rated current, the power factor, and the burden
designation remaining the same.
Burden
Designation** ( )
B–0.10.09
B–0.20.18
B–0.50.45
B–0.90.81
B–1.81.62
B–10.50
B–21.00
B–42.00
B–84.00
± Phase Error at 100%
Primary Current
15 Minutes
30 Minutes
60 Minutes
Burden
0.1Ω
0.2Ω
0.5Ω
1.0Ω
2.0Ω
4.0Ω
8.0Ω
Resistance
0.116
0.232
0.580
1.040
2.080
2.300
4.600
9.200
18.400
Inductance
(mH)
0.1
0.2
0.5
0.9
1.8
1.0
2.0
4.0
8.0
Power Factor
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Impedance Volt Amperes Power
( )
2.5
5.0
12.5
22.5
45.0
25.0
50.0
100.0
200.0
± Phase Error at 100%
Primary Current
30 Minutes
60 Minutes
120 Minutes
(At 5A)
0.9
0.9
0.9
0.9
0.9
0.5
0.5
0.5
0.5
Secondary Voltage
10V
20V
50V
100V
200V
400V
800V
Factor
133