Bảo vệ chống chạm đất một pha cho mạng điện cao áp mỏ có thiết bị bù thành phần điện dung

NGHIEN cufu-TRAO Ddl

Bao V€ chong cham dat mpt pha

cho mang diin cao ap mo co thiet bi bu

thanh phan dien dung

TS. Dinh Van Thang

Trfldng Dai hpc Md-Dia chdt

TOM TAT

Chgm ddt mdt pha trong cdc lUdi dien cao dp mo Id dgng sii cd chiem ty li cao nhdt, dgc trUng

bdi miic do nguy hiim rdt cao cho ngiidi vd trang thiit bi dien trong khai thdc mo. Mdt trong nhiing gidi

phdp hieu qud nhdt de phdng ngita nguy hiem vi tai ngn dien gidt vd hdng hoc thiet bi dien mo Id phdi

trang bi cdc thiet bi bdo ve chong chgm ddt mot pha. Cdc thiet bi bdo ve chdng chgm ddt mdt pha thong

thiidng duac che tgo chu yeu de bdo ve cdc mgng diin cao dp d che do trung tinh cdch ly (trung tinh khdng

ndi ddt). Vdi mgng cao dp cd thiet bi bit thdnh phdn dong dien dung thi thiet bi bdo ve thdng thiidng se

tii chdi tdc ddng khi sU cd hodc tdc ddng nhdm ldn, gdy thiit hgi ldn vi mat kinh te vd mdt an todn vi tai

ngn diin gidt, gdy nguy cd chdy nd cho cdc md trong qud trinh sdn xudt. De khdc phuc diidc diiu ndy, vdi

cdc mgng diin cd lap dgt thiet bi bu thdnh phdn ddng diin dung, cdn sii dung thiet bi bdo vi chdng chgm

ddt mdt pha theo nguyin If tren. Trong bdi bdo ndy, tdc gid diia ra gidi phdp bdo vi chdng chgm ddt mdt

pha cho ludi dien cao dp cd bii thdnh phdn diin dung.

ABSTRACT

Single-phase earth fault in the high-voltage power grid problems as mine is the highest percentage,

characterized by very high level of danger for people and equipment in mining. One of the most effective

measures to prevent the danger of electric shock accidents and malfunctioning equipment to the mine is

equipped with fault protection short circuit to the earth. The equipment ground fault protection a normal

phase is made primarily to protect the high-voltage electricity networks in isolated neutral mode (neutral

ground). With high-voltage network device capacitance current compensation components, the protective

device will usually deny the impact when an accident or mistake effects causing great damage to economic

to mine in the production process. To overcome this, the network has installed equipment components

make up the capacitance, the device should use ground fault protection on single phase principle. In this

paper, the authors offer a solution ground fault protection for single-phase high-voltage grid components

can compensate for the capacitance.

TAP CHf CO KHf VIET NAM •t* Sd 03 (Thang 3 nam 2012)