I. Overview

CK-BZJ-110/220 series transformer neutral point complete equipment is in accordance with DL/T620-1997 "Overvoltage protection and insulation coordination of AC electrical equipment" in the 110kV/220 kV effective grounding power network, the transformer neutral point adopts gap protection The relevant regulations are manufactured for neutral point overvoltage protection of ungrounded transformers in 110kV and 220kV effective grounded power networks.

In order to make the transformer neutral point equipment in the 110kV and 220 kV substations reliable, easy to install, debug and operate, and the layout is simple and beautiful, Shaanxi Changkai Electric Co., Ltd. also introduced transformer neutral point bar gap, gap current transformer and isolation switch. Transformer neutral point complete sets of equipment, such as lightning arresters, terminal boxes and mounting brackets.

The user can choose the transformer neutral point overvoltage protection scheme with pure gap, and also choose the parallel operation of the gap and the lightning arrester to coordinate the protection scheme. Arrester and disconnector can be flexibly assembled according to engineering needs. The operating mechanism of the isolating switch can be selected manually or electrically. The electrical and mechanical properties of all products are fully commissioned and tested before leaving the factory, and can be easily recalibrated at the site of use.

2.Model specification

CK-BZJ-110-200/5 is used for complete equipment of neutral point for 110kV transformer. Configuration Ⅲ anti-pollution post insulator. The rated current ratio of the gap ground circuit CT is 200/5a, the rated output is 20VA, and the grade combination is 5P20. Equipped with gw13-72.5/630a transformer neutral point disconnecting switch. YH1.5 w-72/186 transformer neutral point arrester.