—————— Instruction manual ——————
485
Valid formulas
Vb@Id
N
= (Id
N
/ (Iprim / Isec)) x Rb
and
Gain_required = Vf@Id
N
/ Vb@Id
N
.
Calculation example A
IdN = 2000A, CT = 2400A / 0.5A; Rb = 5 Ohm.
Vb@IdN = (IdN / (2400 / 0.5)) x Rb = (2000 / 4800) x 5 = 2.08333V;
Gain_required = Vf@IdN / Vb@IdN = 0.612 / 2.08333 = 0.29376; therefore
Binary_switch_setting = 51.2 / 0.29376 = 174.29 which is rounded off to 174 and converted into binary format
as
000010101110
. i.e.:
SW3-1
SW3-2
SW3-3
SW3-4
SW4-1
SW4-2
SW4-3
SW4-4
SW4-5
SW4-6
SW4-7
SW4-8
OFF
MSB
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
ON
ON
OFF
LSB
Calculation example B (extreme case)
Id
N
= 85A, CT = 2000A / 1A; Rb = 2.5Ohm.
Vb@Id
N
= (Id
N
/ (2000 / 1)) x Rb = (85 / 2000) x 2.5 = 0.10625V;
Gain_required = Vf@Id
N
/ Vb@Id
N
= 0.612 / 0.10625 = 5.76; therefore
Binary_switch_setting = 51.2 / 5.76 = 8.88888 rounded off to 9 and converted into binary format as
000000001001
.
Calculation example C
IdN = 16000A, CT = 20000A / 5A;
Using an internal 2.50-Ohm RB, inserting a second CT2 with a ratio of 5 A/1 A.
The new Iprim/Isec is the total of 20000 A / 1 A;
Vb@Id
N
= (Id
N
/ (20000 / 1)) x Rb = (16000 / 20000) x 2.5 = 2V;
Gain_required = Vf@Id
N
/ Vb@Id
N
= 0.612 / 2 = 0.306; therefore
Binary_switch_setting = 51.2 / 0.306 = 167.32 rounded off to 167 and converted into binary format as
000010100111
.
Calculation example D
Burden resistor connected to terminals XCT and CT with a 5 A secondary current. Applying the same criteria
for the burden resistor, the ideal burden resistor value is 2.5 Ohm / 5 = 0.5 Ohm. The nearest value for the EIA
E96 series is 0.499 Ohm ±1% but the more commonly used 47 Ohm ±1% can of course also be used.
Id
N
= 8000A, CT = 10000A / 5A, Rb = 0,47Ohm.
Vb@Id
N
= (Id
N
/ (10000 / 5)) x Rb = (8000 / 2000) X 0.47 = 1,88V;
Gain_required = Vf@Id
N
/ Vb@Id
N
= 0.612 / 1.88 = 0.3255319149; therefore
Binary_switch_setting = 51.2 / 0.3255319149 = 157.281; rounded off to 157 and converted into binary format as
000010011101
.
n
ote
:
When choosing the external burden resistor, bear in mind the possibility of substantial power
dissipation. In this example, the power at the rated current is already approx. (1.88)
2
/ 0.47
= 7.5 W without taking into account any overload conditions or the advisability of not using
resistors at more than half of their rated power.
Table A.1.6.3.1: Calculation of the configuration of dip-switches SW3-1 to SW4-8 for standard TPD32-EV-.. drives with external bridge
Rated arma-
ture current
CT
transformer
Jumper J4 (on
the FIRXP-XX
card)
Jumper J5 (on
the FIRXP-XX
card)
Vb@IdN
Gain
required
Binary
switch
setting
Binary
number
SW3-1, ..SW3-4,
SW4-1, ..SW4-8
(on the FIRXP-XX card)
[
a
dc
]
(Rb=5Ω)
[V
dc
]
[MSB … LSB]
1000
1600/0,4
OFF
ON
1,250000
0,489600
105
1101000
000001101000
1010
1600/0,4
OFF
ON
1,262500
0,484752
106
1101001
000001101001
1200
1600/0,4
OFF
ON
1,500000
0,408000
125
1111101
000001111101
Содержание TPD32-EV-...-2B
Страница 1: ... Instruction manual Industrial Application DC drives TPD32 EV ...
Страница 62: ... TPD32 EV 62 10 mm 0 4 150 mm 6 150 mm 6 150 mm 6 10 mm 0 4 10 mm 0 4 50 mm 2 Figure 3 3 2 Mounting Clearance ...
Страница 372: ... TPD32 EV 372 9 BLOCK DIAGRAM 9 1 CONTROL BLOCK DIAGRAMS ...
Страница 373: ... Instruction manual 373 ...
Страница 374: ... TPD32 EV 374 ...
Страница 375: ... Instruction manual 375 ...
Страница 376: ... TPD32 EV 376 ...
Страница 377: ... Instruction manual 377 ...
Страница 378: ... TPD32 EV 378 ...
Страница 379: ... Instruction manual 379 ...
Страница 380: ... TPD32 EV 380 ...
Страница 381: ... Instruction manual 381 ...
Страница 382: ... TPD32 EV 382 ...
Страница 383: ... Instruction manual 383 ...
Страница 384: ... TPD32 EV 384 ...
Страница 385: ... Instruction manual 385 ...
Страница 386: ... TPD32 EV 386 ...
Страница 387: ... Instruction manual 387 ...
Страница 388: ... TPD32 EV 388 ...
Страница 389: ... Instruction manual 389 ...
Страница 390: ... TPD32 EV 390 ...
Страница 391: ... Instruction manual 391 ...
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Страница 393: ... Instruction manual 393 ...
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Страница 395: ... Instruction manual 395 ...
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Страница 397: ... Instruction manual 397 ...
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Страница 399: ... Instruction manual 399 ...
Страница 400: ... TPD32 EV 400 ...
Страница 401: ... Instruction manual 401 ...
Страница 402: ... TPD32 EV 402 ...
Страница 501: ... Instruction manual 501 APPENDIX 3 ACCESSORIES A3 1 EAM Adapter Kit EAM1579 EAM1580 ...
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