System

Nominal

voltage

kV

(Effective value)

Rated high voltage of lightning arrester (kV)

(Effective value)

lightning arrester

Continuous operation

Line voltage

Large kV

(Effective value)

DC 1mA reference voltage

≮kV

(Effective value)

2ms

Square wave current capacity

A

Residual pressure

Umbrella diameter

φ

mm

height

H

mm

Figure number

remark

Lightning impulse current

Steep wave impulse current

Operating impulse current

KV (peak value) ≯

Y2.5WD-4/9.5

three point one five

four

three point two

five point seven

two hundred

nine point five

ten point seven

seven point six

ninety-five

two hundred and seventy

1-1

For electric motors

YH2.5WD-4/9.5

ninety

one hundred and eighty-four

1-2

YH2.5WD-4/9.5DL

ninety

one hundred and eighty-four

1-2

Y2.5WD-8/18.7

six point three

eight

six point three

eleven point two

two hundred

eighteen point seven

twenty-one

fifteen

ninety-five

two hundred and seventy

1-1

YH2.5WD-8/18.7

ninety

one hundred and eighty-four

1-2

YH2.5WD-8/18.7DL

ninety

one hundred and eighty-four

1-2

Y2.5WD-13.5/31

ten point five

thirteen point five

ten point five

eighteen point six

two hundred

thirty-one

thirty-four point seven

twenty-five

ninety-five

three hundred and fifteen

1-1

YH2.5WD-13.5/31

ninety

two hundred and fifty-seven

1-2

YH2.5WD-13.5/31DL

ninety

two hundred and fifty-seven

1-2