Star-Delta Starter में Star से Delta में Switch होने पर Breaker/OLR Trip हो रहा है कैसे सही करेंगे?

Описание: In this video, we will understand why the Main Breaker or OLR (Overload Relay) trips when a motor changes from Star to Delta connection in a Star-Delta Starter panel. ⚡

You’ll learn step-by-step how to identify, test, and fix the issue with 100% practical explanation — directly from real industrial experience.

🧠 Key Topics Covered:

1️⃣ What happens during Star to Delta transition
2️⃣ Main technical reasons for tripping
3️⃣ How to test contactors, wiring, and timer settings
4️⃣ Current and voltage behavior during transition
5️⃣ Star & Delta contactor interlock check
6️⃣ How to set timer delay correctly
7️⃣ Practical troubleshooting on live motor panel
⚙️ Common Causes of Tripping:

Incorrect phase sequence or wiring in Delta connection

Timer delay too short or too long

Contactor interlock failure (Star & Delta overlapping)

Mechanical or electrical interlocking fault

Loose or burnt power cable terminals

Overload relay setting too low

Sudden inrush current while switching

Motor winding issue or internal short

🔧 Solution Guide:

✔ Check phase rotation and continuity of all 6 terminals
✔ Verify timer delay (typically 8–12 seconds) as per load /application
✔ Ensure Star and Delta contactors never close together
✔ Proper OLR setting = .58 × Full Load Current( according to the load or There may be a change of a few percent depending on the s.f. of the motor.
✔ Measure current on each phase using a clamp meter
✔ Test mechanical interlock movement manual.

📊 Standards & Practical Tips:

As per IEC 60947 & IS 13947

Always perform IR test before startup

Keep proper contactor sequence: Main → Star → Delta

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🔹 Star-Delta Starter का पूरा Working Principle
🔹 Star से Delta में Switching के Time क्या होता है inside the motor
🔹 Transition ke दौरान Current और Torque कैसे बदलते हैं
🔹 Breaker या OLR Trip क्यों होता है और इसे कैसे Detect करें
🔹 Real Time Testing – Timer, Contactor, Coil और Wiring Inspection
🔹 Star & Delta Contactor Overlapping का Live Demonstration
🔹 Perfect Time Setting (8–12 sec) कैसे करें
🔹 OLR Trip होने पर किस Sequence में Checking करें
🔹 Mechanical & Electrical Interlock का Actual Function
🔹 Current Spike & Line Voltage Behavior during transition
🔹 Motor IR Test और Contact Resistance Test practically कैसे करें
⚙️ 💥 Possible Reasons of Tripping (Most Ignored Points):

1️⃣ Phase Reversal या Wrong Delta Connection
2️⃣ Timer Delay बहुत कम या ज़्यादा होना
3️⃣ OLR setting गलत होना
4️⃣ Loose Cable Termination या Heating Connection
5️⃣ Star & Delta दोनों Contactor एक साथ close होना
6️⃣ Mechanical Interlock jam या loose होना
7️⃣ Auxiliary contact feedback गलत wiring में होना
8️⃣ Motor Winding Partial Short या High Inrush Current
9️⃣ Control Supply Fluctuation या Neutral Missing
🔟 Contactor Coil Under Voltage या Drop Issue

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