Heavy ice coating can damage transmission lines and towers, ultimately leading to a power supply outage in partial or the entire grid network. To guarantee the safe operation of the power system in severe weather, NR Electric provides consumers with the PCS-9590 fixed DC de-icer and the PCS- 9591 relocatable DC de-icer for the protection of transmission lines. The DC output voltage is adjustable. Different DC short-circuit currents can be supplied according to the conductor’s diameter and length. In addition, the de-icer device can also be used as SVC to quickly compensate reactive power, stabilize system voltage and improve power quality.
The use of thyristor rectifiers can reduce the impact on the power system during ice melting and ease the switch-over operations.
The DC de-icer device supports large current and large angle continuous stable operation. It is applicable to transmission lines with different conductor diameters and lengths.
The PCS-9590/9591 DC de-icer can adopt container type installation and valve hall installation, effectively reducing land occupation, shortening the site construction time frame and easing the equipment transportation.
The device adopts reliable and compact structure with a water cooling or air cooling system and compact valve banks.
The PCS-9590/9591 is equipped with 6 phase switching disconnectors enabling the automatic switchover among various ice melting modes and realizing the balanced ice melting for AC lines.
NR Electric also provides the high performance control and protection system for DC de-icing.
Primary system of DC ice melting device requires only very small number of operations to realize SVC function.
The fixed DC de-icer can be used for long transmission lines with high voltage level. The power supply of PCS-9590 is normally fed by a LV AC bus. The PCS-9590 fixed DC de-icer includes:
Two standard containers: one is used to install valve banks and water cooling system, the other is equipped with phase switching disconnector and control panels.
Converter transformer: to offer voltage transformation and commutation reactance
12-pulse conversion valve banks: to convert AC current to DC current.
Water cooling system: including indoor forced water cooling and outdoor forced air cooling.
Phase switching disconnector: to select the target AC line and realize balanced de-icing of AC lines.
Control and protection system: to provide supervision and protection of whole DC de-icer device.
The relocatable DC de-icer device can be utilized in short-distance lines with low voltage levels. The PCS-9591 relocatable DC de-icer includes:
One standard container: to install all equipment.
6-pulse conversion valve: To convert AC current to DC current.
Cooling system: including indoor forced water cooling and outdoor forced air cooling.
Phase switching disconnector: to select the target AC line and realize balanced de-icer of AC lines.
Control and protection system: to provide supervision and protection functions for the whole DC de-icer device.