变压器中性点接地电阻柜、发电机中性点接地电阻柜和低压接地电阻柜。该系列产品具有广泛的应用范围,通常情况下可以将其安装于发电厂厂用电系统、变电所供电系统、工矿企业配电系统中,实现这些电网采用接地电阻柜系统运行方式。接地电阻柜大多适用于中性点采用小电阻或中电阻接地的场合,具有一定的针对性能,当其设备在使用过程出现故障时,需要将其立即跳闸切除故障线路,因此,该产品具有一定的实用性。
Transformer neutral point grounding resistance cabinet, generator
neutral point grounding resistance cabinet and low voltage grounding
resistance cabinet. This series of products have a wide range of
applications. Usually, they can be installed in the auxiliary power
system of power plants, power supply systems of substations, and
distribution systems of industrial and mining enterprises. The grounding
resistance cabinet is mostly suitable for neutral point grounding with
small resistance or medium resistance. It has certain targeted
performance. When the equipment fails in the use process, it needs to
trip immediately and cut off the fault line. Therefore, the product has
certain practicability.
变压器中性点接地电阻柜作用:我国电力系统常用的中性点接地方式有:中性点直接接地、中性点不接地、中性点经消弧线圈接地(谐振接地)、中性点经电阻接地这四种方式。电力系统接地运行方式涉及电网的安全运行、供电可靠性、用户用电安全等诸多重要问题。中性点经电阻接地就是在电网中性点与地之间串联接入某一电阻器。适当选择所接电阻器的阻值,不仅可以泄放单相接地电弧后半波的能量,从而减少电弧重燃的可能性,抑制电网过电压的辐值,还可以提高继电保护装置的灵敏度以作用于跳闸,从而有效保护系统正常运行。变压器中性点接地电阻柜是6-35KV配电网中变压器中性点接地保护专用成套设备,目前已广泛应用于以电缆线路为主的城市配电网、大型工业企业、工厂、机场、港口、地铁等重要电力用户配电网以及发电厂厂用电系统。
Function of transformer neutral point grounding resistance cabinet: the
commonly used neutral point grounding methods in China's power system
are: the neutral point is directly grounded, the neutral point is not
grounded, the neutral point is grounded through the arc suppression coil
(resonant grounding), and the neutral point is grounded through
resistance. Grounding operation mode of power system involves many
important problems such as safe operation of power grid, reliability of
power supply, and safety of users. The neutral point grounded by
resistance is a resistor connected in series between the neutral point
and the ground. Proper selection of the resistance value of the
connected resistor can not only release the energy of the second half
wave of the single-phase grounding arc, so as to reduce the possibility
of arc re ignition and suppress the radiation value of the grid
overvoltage, but also improve the sensitivity of the relay protection
device to act on the tripping, so as to effectively protect the normal
operation of the system. Transformer neutral point grounding resistance
cabinet is a complete set of special equipment for transformer neutral
point grounding protection in 6-35kV distribution network. At present,
it has been widely used in urban distribution network, large industrial
enterprises, factories, airports, ports, subways and other important
power users distribution network and auxiliary power system of power
plants