Narrative:

Flight departed ZZZ airport XA55 local time. While taxiing out; heavy precipitation was passing over the field and we had a release time per air traffic control at XB26 local time. We parked in the hold pad in ZZZ. It's important to note while stationary there was no odor; fumes; or noises out of the ordinary heard at this time. We received our takeoff clearance at XB28 local time and proceeded on course. At approximately 8;000 feet; we heard a loud whining noise begin to sound from in front of the panel area. I did not think anything of this at the moment; however; began to monitor the noise. I noticed the first officer (first officer) have a look of concern on his face and questioned if I was hearing the same noise. We both agreed and had not heard this type of sound before. (It is noted that when we landed in ZZZ1; I confirmed all external service doors has been shut; and not left open). As the climb continued both pilots complained of being very warm; when referencing the ecs (environmental control systems) synoptic page temps were normal with a left pack selected temp of 22 and an output temp of 11: the right pack had a selected temp of 25 with an output temperature of 12. Prior to 17;000 feet; an intense electrical burning smell was first noticed by the captain. Going through FL180; I recall being very distracted by this smell conducting the climb checklist. As the climb continued; the smell persisted and it was very present to both the captain and first officer. At FL270; we leveled and the smell intensified more through the flight deck. I called for the non-EICAS abnormal QRH for smoke/fumes/dispersal procedure; immediate descent was made while the pilot monitoring (pm) was running the QRH.ATC was notified; and coordination to divert to the nearest suitable airport was made. Flight attendants were notified immediately for the yellow emergency; and passengers were briefed. Nearest suitable airport was ZZZ1. Oxygen was utilized until entering the terminal area were we removed them for improved communication as well as identifying ZZZ1 since there were similar layout airports in the area. Both captain and first officer experienced nausea; lightheadedness; and headache during the approach. During the descent the whining noise from the front of the flight deck persisted. After clearing runway; I brought the aircraft to a stop; notified the passengers to remain seated and that airport fire and rescue would be following the aircraft. A call to the flight attendants had also been made to check on their wellbeing as well as the passengers. Once parked firefighters came on with a device to detect heat. There was an area detected of heat coming from cbp-1 (circuit breaker panel) around breaker T5 'ess 2B' and T2 'ess tru (transformer rectifier unit) 1'. I had the firefighter check the nose area of the airplane; and a single tru was found producing more heat than the others. Passengers were deplaned into the terminal and kept updated on conditions. Captain and first officer received medical attention at the emergency room due to symptoms felt. Treated and released that evening.

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Original NASA ASRS Text

Title: CRJ-900 flight crew reported a diversion due to intense electrical fumes during climb.

Narrative: Flight departed ZZZ Airport XA55 local time. While taxiing out; heavy precipitation was passing over the field and we had a release time per air traffic control at XB26 local time. We parked in the Hold Pad in ZZZ. It's important to note while stationary there was no odor; fumes; or noises out of the ordinary heard at this time. We received our takeoff clearance at XB28 local time and proceeded on course. At approximately 8;000 feet; we heard a loud whining noise begin to sound from in front of the panel area. I did not think anything of this at the moment; however; began to monitor the noise. I noticed the FO (First Officer) have a look of concern on his face and questioned if I was hearing the same noise. We both agreed and had not heard this type of sound before. (It is noted that when we landed in ZZZ1; I confirmed all external service doors has been shut; and not left open). As the climb continued both pilots complained of being very warm; when referencing the ECS (Environmental Control Systems) Synoptic Page temps were normal with a Left Pack selected temp of 22 and an output temp of 11: the Right Pack had a selected temp of 25 with an output temperature of 12. Prior to 17;000 feet; an intense electrical burning smell was first noticed by the Captain. Going through FL180; I recall being very distracted by this smell conducting the Climb Checklist. As the climb continued; the smell persisted and it was very present to both the Captain and First Officer. At FL270; we leveled and the smell intensified more through the flight deck. I called for the Non-EICAS Abnormal QRH for SMOKE/FUMES/DISPERSAL PROCEDURE; immediate descent was made while the Pilot Monitoring (PM) was running the QRH.ATC was notified; and coordination to divert to the nearest suitable airport was made. Flight Attendants were notified immediately for the Yellow Emergency; and passengers were briefed. Nearest suitable airport was ZZZ1. Oxygen was utilized until entering the terminal area were we removed them for improved communication as well as identifying ZZZ1 since there were similar layout airports in the area. Both Captain and FO experienced nausea; lightheadedness; and headache during the Approach. During the descent the whining noise from the front of the flight deck persisted. After clearing runway; I brought the aircraft to a stop; notified the passengers to remain seated and that airport fire and rescue would be following the aircraft. A call to the flight attendants had also been made to check on their wellbeing as well as the passengers. Once parked firefighters came on with a device to detect heat. There was an area detected of heat coming from CBP-1 (Circuit Breaker Panel) around breaker T5 'ESS 2B' and T2 'ESS TRU (Transformer Rectifier Unit) 1'. I had the firefighter check the nose area of the airplane; and a single TRU was found producing more heat than the others. Passengers were deplaned into the terminal and kept updated on conditions. Captain and FO received medical attention at the emergency room due to symptoms felt. Treated and released that evening.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.