In this paper, we will introduce the concept of strong electric field protection and the principle of appliance. Through knowledge explanation and appliance principle introduction, master the requirements of strong electric field protection in live working, the principle and technical requirements of shielding clothing.

 

 

 

帶電作業(yè)中所遇到的電場幾乎都是不對稱分布的極不均勻電場。作業(yè)人員在攀登桿塔或變電站構(gòu)架，由地電位進入強電場的過程中，構(gòu)成了各種各樣的電場。JEM電機引接線帶電作業(yè)中人在強電場下的保護

 

The electric fields encountered in live working are almost all extremely uneven electric fields with asymmetric distribution. In the process of climbing tower or substation frame and entering strong electric field from ground potential, operators form a variety of electric fields.

 

 

運行中的導(dǎo)線其表面及周圍空間存在著電場，且屬于不均勻電場，其表面的電場強度高于周圍空間的電場強度。影響導(dǎo)線表面及周圍空間電場強度的因素是多方面的，主要包括：輸電線路運行電壓、相間距離與分布、導(dǎo)線對地高度、分裂導(dǎo)線數(shù)目、分裂距與子導(dǎo)線的直徑、導(dǎo)線表面狀況、當(dāng)?shù)貧庀髼l件等。根據(jù)理論計算，500kV系統(tǒng)中若采用LGJ—300型導(dǎo)線、四分裂、分裂距45cm×45cm,則導(dǎo)線表面最高場強為1550/2250kV/m (有效值/峰值)。

 

The electric field exists on the surface and the surrounding space of the running conductor, which belongs to non-uniform electric field. The electric field intensity on the surface of the conductor is higher than that in the surrounding space. There are many factors that affect the electric field intensity on the surface of the conductor and the surrounding space, including the operating voltage of the transmission line, the distance and distribution between phases, the height of the conductor to the ground, the number of split conductors, the split distance and the diameter of the sub conductors, the surface condition of the conductor, the local meteorological conditions, etc. According to the theoretical calculation, if lgj-300 type conductor is used in 500kV system, with four splits and split distance of 45cm × 45cm, the maximum field strength on the conductor surface is 1550 / 2250kV / M (effective value / peak value).

 

 

在帶電作業(yè)的全過程中人體處于空間電場的不同位置，對空間電場的影響是不一樣的，人體各部位體表的場強也是不一樣的。將人體看成導(dǎo)體，由于靜電感應(yīng)，當(dāng)人體處于地面時，整個人體處于地電位，人體形成突出，一般來說頭部體表場強最高；當(dāng)人體在導(dǎo)線與地面間電位懸?。ㄏ喈?dāng)于中間電位作業(yè)時），沿著電場的縱方向的人體突出部位（頭、腳）體表場強最高；人體與導(dǎo)線電位相等后，人體的突出部分將發(fā)出電力線，此處的體表場強最高；在操作人員進行電位轉(zhuǎn)移的瞬間，手接觸導(dǎo)線時手與導(dǎo)線之間的氣隙處的場強非常大，會導(dǎo)致手指與導(dǎo)線之間發(fā)生放電，直到手指握住導(dǎo)線后，放電才會停止。帶電作業(yè)中人在強電場下的保護

 

In the whole process of live working, human body is in different position of space electric field, which has different influence on space electric field, and the field strength of human body's surface is also different. The human body is regarded as a conductor. Due to electrostatic induction, when the human body is on the ground, the whole human body is at the ground potential, and the human body forms a protrusion, generally speaking, the field strength of the head body surface is the highest; when the human body is suspended between the wire and the ground (equivalent to the operation of intermediate potential), the field strength of the body protrusion (head and foot) along the longitudinal direction of the electric field is the highest; the potential of the human body and the wire is the same After waiting, the protruding part of the human body will send out the power line, where the body surface field strength is the highest; at the moment of potential transfer, when the hand contacts the wire, the field strength at the air gap between the hand and the wire is very large, which will cause the discharge between the fingers and the wire, and the discharge will not stop until the fingers hold the wire.