Timeline for Pre-charge resistor and contactor power dissipation calculation
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Oct 27, 2023 at 15:40 | history | edited | Marcus Müller |
edited tags
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| Jan 13, 2022 at 5:21 | history | edited | Burak Bozdoğan | CC BY-SA 4.0 |
Generally, as you see in the graph one precharge contactor and paralel with other two contactors system used. When capacitor energised precharge contactor path closed, other contactors activated and main contactors become current path. Why they design with three contactors?
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| Jan 13, 2022 at 5:10 | comment | added | Burak Bozdoğan | " It will be zero when the relay is energised." However, we put resistor and contactor between battery and inverter. When motor pulls the power, there will be current on that path. So, resistance should dissipate some power in my view. I would like to hear your ideas if I am wrong. Thanks | |
| Jan 12, 2022 at 14:28 | comment | added | Transistor | "I am asking what is power dissipation when motor drain current." It will be zero when the relay is energised. | |
| Jan 12, 2022 at 14:09 | answer | added | user80875 | timeline score: 1 | |
| Jan 12, 2022 at 13:47 | history | edited | SamGibson♦ | CC BY-SA 4.0 |
appended answer 604057 as supplemental
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| Jan 12, 2022 at 10:44 | comment | added | Kartman | Why are the fuses on the load side as opposed to the battery side? What protects the battery and its wiring? You have a wire that can deliver 1000’s of amps going to a keyswitch. That’s just wrong. | |
| Jan 12, 2022 at 8:28 | comment | added | Transistor | Peak power in the pre-charge resistor will be given by \$ P = \frac {V^2 } R \$. Voltage across the reistor will decay by 63% in one time constant, \$ \tau = RC \$ where \$ C \$ is the on-board capacitance. | |
| Jan 12, 2022 at 8:23 | history | asked | Burak Bozdoğan | CC BY-SA 4.0 |