AKM 345 Gen2 Instruction Manual
(Rev No. ECN-27992)
4
www.qualitrolcorp.com
5.1. Instructions for Adjusting Matching Resistance
1. Check or calculate current in A from Your Current Transformer (at bushing) at 100 %
transformer load.
2. Check the required Winding Temperature gradient in °C or K.
3. Use the graph in Fig.3 for the CT current and gradient to determine the required
resistance setting in Ohms. Take note of this value.
4. Connect a multi meter, (Example: Fluke) set for resistance measurement to the
terminals 5-5 inside the WTI.
5. Adjust the matching resistance TD50 or TD76 until you reach the required resistance
value. For TD50/5A see section 5.4.
6. Secure the lock nut on the matching resistance for this setting.
7. Check operation and make final adjustments if necessary.
8. Please consult Customer Service for additional information.
Figure 3 – Temperature Gradient Graph
1.2
1.3
1.41.5
1.6
1.7
1.8
1.9
2
2.1
2.2
1
1.1
2,3
2,4
2,5
2,6
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
°C
Temperature Gradient – Adjustment Graph
-
Re
sistance, Oh
ms
