What is the setting of OLR in a star-delta connection?

Question

Accepted Answer

OLR setting in a star-delta connection determines the transition point between star and delta mode.

OLR stands for Overload Relay.
In a star-delta connection, the motor is initially started in star mode to reduce the starting current.
After a certain time, the motor is switched to delta mode for normal operation.
The OLR setting determines the current threshold at which the transition from star to delta occurs.
The OLR setting should be adjusted based on the motor's rated current and the desired transition time.

Accepted Answer

2. ओवरलोड रिले एक इलेक्ट्रिकल डिवाइस है जिसका उपयोग हम मोटर सेफ्टी देने के लिए करते हैं या मोटर में जाने वाले करंट को सेंस करती है और अगर मोटर रिले पर से करंट से ज्यादा एंपियर करंट लेती है तो ओवरलोड सर्किट को ट्रीप कर देती है।

Accepted Answer

OLR mean is over load realy its size of main contractor 58%X full load current

If size of main contractor 58%X13=8amp

Mean size of delta contactor 8amp.

Accepted Answer

Its rated current / root three.

What is the setting of OLR in a star-delta connection?

Top Plasser India Electrical Design Engineer interview questions & answers

Popular interview questions of Electrical Design Engineer

Top HR questions asked in Plasser India Electrical Design Engineer