۱۳۸۸ خرداد ۲۰, چهارشنبه

حوادث ناشي از دستكاري غيرمجاز تجهيزات اندازه گيري برق ( كنتور )


نصب هرتجهيزالكتريكي داراي الزاماتي مي باشد كه بايد استفاده كنندگان اين شرايط را كاملاً رعايت نمايند.
شرايط استاندارد نصب تجهيزات اندازه گيري ( كنتور ) برق توسط شركت هاي توزيع برق قبل از نصب اين تجهيزات به متقاضيان انشعاب ابلاغ مي گردد :
1- محل نصب كنتور بايد مسطح و كاملا" تراز باشد.
2- ارتفاع محل نصب كنتور بايد از سطح زمين حداقل 155 سانتيمتر و حداكثر 210 سانتيمتر باشد
3- مسير عبور كابل به درون ساختمان و تا محل نصب كنتور نبايد با اجسام فلزي تماس داشته باشد و در صورت نياز به عبور كابل از ديوار لازم است لوله گذاري مناسب و ايمن انجام گردد .
4- فاصله محل نصب كنتور برق تا محل نصب كنتور گاز نبايد كمتر از 150 سانتيمتر باشد .
5- در صورتيكه واحد درخواستي جهت انشعاب برق در يك ساختمان سه واحدي و يا بيشتر باشد متقاضي بايد تابلو كنتورهاي مناسب تهيه و نصب نمايد .
ولي متآسفانه مشاهده مي گردد كه مشتركين محترم بدون مجوزدراين تجهيزات دستكاري نموده و بعضي از موارد با سليقه خود كنتورها را جابجا نموده و حتي در صورت كوتاه بودن كابل ورودي ( كابل دستك ) ، مقداري كابل به آن اضافه مي نمايند كه اين كار غيرقانوني بوده و جرم محسوب مي گردد ، به هر حال نتيجه اين دستكاري هاي غير مجازمي تواند حوادث غيرقابل جبراني درپي داشته باشد كه نمونه اي از آن را در تصاوير مشاهده مي فرماييد :



۱۳۸۸ خرداد ۱۵, جمعه

برخورد بيل مكانيكي با خطوط هوايي فشار قوي برق

تصوير A بوم بيل مكانيكي را نشان مي دهد كه با شبكه ولتاژ قوي برخورد نموده است

Electrical arcing occurred when a high voltage/high current cross-country power line contacted the boom of a CAT excavator. Current flowed throughout the entire excavator in passing to the ground. In fact, the current that passed through the CAT excavator "crystallized" the ground around the excavator. A view of the subject excavator at the accident scene is shown in Photograph A.
Photograph A: Cat excavator at accident scene, where a high voltage/high current power line contacted the excavator boom.
تصوير B محل برخورد با هادي برق و آسيب ناشي از قوس را نشان مي دهد

Metallurgical evaluation of various CAT excavator parts revealed that considerable arcing damage occurred at component part joints and junctions. Photograph B shows engine main bearing arcing damage.
Photograph B: Main bearing arcing damage.
Photograph C shows external electrical arcing damage to electrical conduit on the subject excavator.
Photograph C: Arcing damage on electrical conduit
After metallurgical analysis, it was concluded that replacement of individual arc damage parts would be more costly than merely replacing the entire CAT excavator.

تصوير C محل برخورد با هادي الكتريكي و آسيب ناشي از قوس الكتريكي را نشان مي دهد

حريق ناشي از آرك خطوط هوايي برق

A grass fire burns between the electrical substation on McMillan and the Bob Werner residence. Sparking electrical lines from the accident caused the fire. Moments after this photo was taken these flames were extinguished.
قوس الكتريكي تجهيزات الكتريكي مي تواند در اثر عملكرد نادرست سيستم هاي حفاظتي و يا انجام فعاليت غير استاندارد ( خرابكارانه و غير مسئولانه ) در جواريا روي اين تجهيزات توسعه يافته و در نتيجه موجب حريق در محيط اطراف خود شود

Scout leaders electrocuted

Four adult boy scout leaders died of electrocution Monday as they were setting up camp on the opening day of the group's 2005 Jamboree in Virginia.
The accident happened as more than 40,000 scouts and volunteers from around the world converged at the U.S. Army's Fort A.P. Hill, just south of Washington, D.C.
The four leaders were from a troop in Alaska.
Utility workers shut off power lines following an electrical accident that killed four scout leaders near Bowling Green, Va., Monday, July 25. (AP Photo/The Free Lance-Star, Rebecca Sell)Jamboree officials declined to discuss how the accident happened, but the Washington Post quoted Sheriff A.A. "Tony" Lippa Jr. of Caroline County as saying that a pole may have struck a power line.
Among the dead was scoutmaster Ron Bitzer of Anchorage.
Family spokesman and the troop's scoutmaster, Ken Schoolcraft, told the Associated Press that Bitzer was a retired administrative judge and an assistant scoutmaster of Troop 129 in Anchorage.
"Scouting was what he loved. He spent many, many, many hours working with scouting," Schoolcraft said. "It was a way for him to help others."
The names of the other victims have not yet been released.
One other leader from Alaska and two contract workers were hospitalized in stable condition. No boy scouts were seriously injured.
Alaska Gov. Frank Murkowski offered his condolences to the victims' families and troop members.
"These individuals were killed while serving Alaska's young people – and I admire and thank them for that service," he said in a statement.
Jamboree organizers said the event will go on and they have brought in grief counsellors.

1 killed, another hurt in Holladay electrical accident

By Pat ReavyDeseret News
HOLLADAY — One man was killed and another severely burned while working on a power pole Tuesday morning.
The men were left dangling 15 to 20 feet in the air, with only their safety harnesses preventing them from falling to the ground, as a third worker attempted to get them down in a daring rescue by climbing the pole and lowering them to the ground.
"It was horrible, it was absolutely horrible," said Pat Carrillo.
Several residents, including Carrillo, broke down in tears as they recounted watching the workers hang from the pole.
"He was upside down. It looked like he was trying to get his harness off of him. I could hear him moaning," she said of the lone survivor.
Stephen G. Vlamakis, 26, of Helper, was killed in the accident. Fatu Matagi, 28, Bountiful, suffered extensive injuries and was listed in critical condition Tuesday night.
Both were employees of Mountain Power Construction and were working near a transformer on a power pole located in the corner of several backyards near 4100 South and 1400 East. The pole they were working on had numerous wires connected to it.
At 11:43 a.m., a garbage truck driver and a resident spotted the workers and called 911. Investigators were still looking for witnesses. Carrillo said she was on her computer when the power suddenly went out. That's when she ran outside and saw the workers dangling from the pole.Neighbor Bunny Higgins had gone to the store only to receive a call a short time later that something that sounded like a gunshot was heard in her neighborhood. When she returned she saw the two men hanging, with Vlamakis dangling a little lower than than Matagi.
"His hat shot off," she said in tears. "There was smoke coming off his head."
A Rocky Mountain Power employee, who had received special training in these types of rescues, quickly climbed the pole, rendered the power lines safe, set up a pulley system and lowered the men down to waiting Unified Fire Authority crews.
"I knew he's not going to make it because he never moved at all," Carrillo said upon seeing Vlamakis.
Officials believe the two workers were suspended in the air 35 to 45 minutes before they were brought down. Matagi was semiconscious and able to talk with paramedics after he was brought to the ground, said fire Capt. Jay Fearnley.
Investigators believe Vlamakis was killed instantly.