transformer neutral grounding protection device

Transformer neutral grounding protection Device

1.Brief introduction

Design principle: The grounding protection device is applicable to 110kV, 220kV or 330kV power transformer circuits in order to realize the conversion of earthing method.

Provide over-voltage protection for neutral of 110 kV graded insulated transformers.

2.Structure: It consists of the following parts

(1)Disconnecting Switch

(2) Zinc-oxide Surge Arrestor

(3) Rod Gap

(4)Current Transformer

(5)Mounting Brackets

THT-TNP-110

Transformer system Nominal Voltage110kV

Insulation levelLight impulse withstand voltage250 kV325 kV

Power frequency withstand voltage95 kV140 kV

Rod GapTypeTHT-TNP-110

DescriptionsElectrode bar with hemispheric ends

The adjustable range50-160mm

Current Transformer(Used for protecting rod gap )TypeTHT-LJ80

ModelEpoxy-resin filled totally closed type



Rated primary current100A 150A 300A 400A 500A 600A

Rated secondary current1A/5A

Accurate combination and ratings10P5/10P5 15VA/15VA

Disconnecting Switch

TypeGW13-72.5

Rated voltage72.5kV

Rated current630A/1250A

Operating mechanismCS17 type manual operating mechanism,CJ6 type motor-driven operating mechanism

Surge ArresterTypeY1.5W-60/144Y1.5W-72/186

Nominal discharging current1.5kA

Rated voltage60kV72kV

Continuous operating voltage48kV58kV

Lighting impulse residual voltage

144kV186kV

Counter/Monitor

JS8 type surge arrester counter/JCQ3 type surge arrester monitor