Renewal Parts - ABB HU Instruction Leaflet

B. Operating Circuit
Apply 30 percent tap-value current to terminal 3
and a tap screw. Using a high-resistance voltme-
ter, the ac voltage across the operating coil
bridge and the ac voltage output of the operating
transformer (top two coil terminals) should be
within the range given in Table 3.
Harmonic Restraint Unit (HRU)
Apply 30 percent tap-value current to terminal 3 and
a tap screw. The voltages obtained by using a high
resistance ac voltmeter should be within the range
given in Table 3. (Refer to figure 16.)
Burden of Each Restraint Circuit
Tap
2.9
3.2
3.5
3.8
4.2
4.6
5.0
8.7
Burden of Operating Circuit
Tap
2.9
3.2
3.5
3.8
4.2
4.6
5.0
8.7
†
Degrees current lags voltage at tap value current
‡
Voltages taken with Rectox type voltmeter
‡ Thermal Rating
One Second – 300 amperes
Thermal capacities for short times other than one second may be calculated on the basis of time being inversely proportional to the
square of the current.
ENERGY REQUIREMENTS
Power
Continuous Factor
Rating Angle
8 71
10 70
11 66
12 65
13 58
14 57.5
16 52.5
20 30
Power
Factor
Continuous
Rating Angle
8 35
10 34
11 33
12 33
13 31
14 30
16 29
20 23
Diode Check
Check for open or shorted diodes using the electrical
checkpoints above.

RENEWAL PARTS

Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.
At
tap value
†
current
.88
.89
.90
.91
.91
.91
.92
1.28
At
tap value
*
current
2.26
2.30
2.30
2.30
2.30
2.40
2.50
3.18
‡
Volt Amperes
At 8 times At 20 times
tap value tap value
current current
50 191
51 211
51 203
53 220
53 235
55 248
59 280
94 340
†
Volt Amperes
At 8 times At 20 times
tap value tap value
current current
76 487
78 499
81 504
83 547
84 554
88 598
92 640
132 850
41-347.12C
21