Interactive 11 kV Voltage Regulator with On-Load Tap Changer (OLTC) Training Simulator
Training ModeSingle-Line Diagram — 11 kV Distribution Feeder with OLTC Voltage Regulator
Controls
Tap ChangerTap 0
11 kV Bus Voltage11.00 kV
Incoming Length2 km
Individual Loads (% of 100 A base each)
Load 150%
Load 250%
Load 350%
Outgoing Feeder Segment Lengths
Seg 15 km
Seg 25 km
Seg 35 km
Line Drop Compensation
R Comp0
X Comp0
Scenarios
Live Trend — End-of-Feeder Voltage & Tap Position
Live System Values
Source V
11.00 kV
Reg Input V
11.00 kV
Tap Position
0
Reg Output V
11.00 kV
Node 1 V (Load 1)
11.00 kV
Node 2 V (Load 2)
11.00 kV
Node 3 V (End)
11.00 kV
Total Load I
150 A
Total V Drop
0.00 kV
Auto / LDC
OFF / OFF
What Is Happening Now
System initialised.
Warnings & Limits
✓ Normal
Key Concepts
Voltage Regulator Purpose
Maintains outgoing feeder voltage within limits as load changes. Compensates for both incoming and outgoing feeder voltage drops.
On-Load Tap Changer
Changes transformer turns ratio while energised. Diverter switch uses transition resistors for break-before-make switching. Each step = 1.25 %.
Feeder Voltage Drop
V = I × Z per segment. Current in each segment equals the sum of all downstream loads. Closer loads contribute to drops affecting distant loads.
Cumulative Voltage Profile
Voltage drops progressively along the feeder. The regulator compensates for incoming feeder drop and uses tap position to maintain its output voltage at the setpoint.
Line Drop Compensation
Estimates remote voltage using CT current × configured R/X settings. Lets the controller regulate remote voltage, not just local bus voltage.