Hyundai DHY22KSEm, Operation And Maintenance Manual

User manual 

11 

2.10

Electrical

Connection

Only

full

qualified

and

experienced

electrical

technicians

should

carry

out

electrical

installation,

service

and

repair

work.

Warning:

!

Make

electrical

connections

in

compliance

with

relevant

electrical

codes,

standards

or

other

requirements.

2.10.1

Cabling

Due

to

movement

of

generating

sets

on

their

vibration

mounts,

the

electrical

connection

to

the

set

should

be

made

with

flexible

cable.

The

cable

must

be

suitable

for

the

output

voltage

of

the

generating

set

and

the

rated

current

of

the

set.

In

determining

the

size,

allowances

should

be

made

for

ambient

temperature.

Method

of

installation,

proximity

of

other

cables,

etc.

All

connections

should

be

carefully

checked

for

integrity.

Current

carrying

capacity

of

power

cables

that

will

be

given

in

APPENDIX

A.

On

the

other

hand,

there

is

a

one

more

important

point

while

cable

cross

sections

are

being

selected.

If

the

distance

between

load

and

generator

is

too

length,

voltage

falling

at

the

load

side

can

be

too

much

at

the

transient

current

duration.

The

voltage

drop

across

a

cable

can

be

determined

as

follows:



1000

)

Xsin

Rcos

I

L

3

Δ

U















Δ

U

Voltage

drop

(V)

L

Length

of

conductors

(m)

I

Rated

current

(A)

R

Resistance

(

Ω

/km

to

VDE

0102)

X

Reactance

(

Ω

/km

to

VDE

0102)

Refer

to

APPENDIX

E

Cable

Current

load

standard.

2.10.2

Grounding

/

Earthing

Requirements

The

frame

of

the

generating

set

must

be

connected

to

an

earth

ground.

Since

the

set

is

mounted

on

vibration

isolators,

the

ground

connection

must

be

flexible

to

avoid

possible

breakage

due

to

vibration.

Ground

connection

cables

or

straps

should

have

at

least

full

load

current

carrying

capacity

and

meet

applicable

regulations.

2.10.3

Insulation

Test

Before

starting

the

generating

set

after

installation,

test

the

insulation

resistance

of

the

windings.

The

Automatic

Voltage

Regulator

(AVR)

should

be

disconnected

and

the

rotating

diodes

either

shorted

out

with

temporary

links

or

disconnected.

Any

control

wiring

must

also

be

disconnected.

A

500

V

Megger

or

similar

instrument

should

be

used.

Disconnect

any

earthing

conductor

connected

between

neutral

and

earth

and

megger

an

output

terminal

to

earth.

The

insulation

resistance

should

be

in

excess

of

1M

Ω 

to

earth.

Should

the

insulation

resistance

be

less

than

1M

Ω 

winding

must

be

dried

out.

2.11

Power

distribution

system

Our

diesel

engine

generator

set

use

three

phase

five

line

system

for

power

distribution.

That

is,

three

phase

live

wires,

one

neutral

line,

one

ground

line.

The

neutral

line

and

the

ground

line

are

not

connected.

Users

can

choose

three

phase

four

lines

for

power

distribution

according

to

requirement

that

is

to

connect

the

neutral

line

to

the

ground

(base

frame),

so

that

to

solve

the

problem

of

feint

that

the

neutral

line

sometimes

is

electriferous.

Note:

HYUNDAI

Power

series

diesel

engine

generator

sets

require

users

to

safely

connect

generator

sets

and

base

frames

to

the

ground,

please

refer

to

the

ground

label

for

connecting

point.