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I was studying the relays at our site and noticed the various settings for the protections, such as over current, thermal overload, etc.
Motor ratings: 11KV, 20A, 250kW
I need to verify whether these settings are accurate or not. Where can i find specific ranges/standards for the relay settings for the aforementioned 11KV motor. An example of what I'm looking for is for low stage over current (3I>). I have:
Start current: 1.1 x Nominal Current
Start time: 9 sec
trip pulse: 40 ms
I'm specifically trying to find ranges/standards for the following protections:
- 3 Phase Non directional over current (3I>, 3I>>, 3I>>>)
- 3 Phase Thermal overload (3I thdev)
- Negative phase sequence (I2>)
- Ground fault (Io>)
- Motor start up supervision (Is2t n<)
- 3 Phase Under voltage (3U<)
Motor ratings: 11KV, 20A, 250kW
I need to verify whether these settings are accurate or not. Where can i find specific ranges/standards for the relay settings for the aforementioned 11KV motor. An example of what I'm looking for is for low stage over current (3I>). I have:
Start current: 1.1 x Nominal Current
Start time: 9 sec
trip pulse: 40 ms
I'm specifically trying to find ranges/standards for the following protections:
- 3 Phase Non directional over current (3I>, 3I>>, 3I>>>)
- 3 Phase Thermal overload (3I thdev)
- Negative phase sequence (I2>)
- Ground fault (Io>)
- Motor start up supervision (Is2t n<)
- 3 Phase Under voltage (3U<)