CHINT NWC5 Series, Инструкция пользователя

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Model
Harmonic source power
/ transformer capacity
Harmonic source power
/ transformer capacity
Harmonic source power
/ transformer capacity
N
LL
≤ 10 % N
LL
≤ 20 % 20 %≤ N
LL
≤ 40 %
Voltage total
harmonic distortion
THDu ≤ 3 % 3 %＜ THDu ≤ 5 % THDu ＞ 5 %
Rated voltage
of capacitor
0 . 4kV , 0 . 45kV 0 . 45kV , 0 . 48kV 0 . 48kV , 0 . 525 kV
Harmonic
suppression measures
Not needed
Recommend to use
series reactor 7 %
Series reactor 7 %
or 14 %
Conditions for Normal Use , Installation and Transportation , and Storage
3 . 3 . 3 . If detuning low voltage series reactor is installed at the front end of the capacitor , the rated voltage of
the capacitor should be selected as below : If the reactance rate of the reactor is 6 % or 7 %, the rated voltage
of the capacitor should be 0 . 45kV or 0 . 48kV , if the reactance rate of the reactor is 12 % or 14 %, the rated
voltage of the capacitor should be 0 . 525kV .
Table 1 Capacitor selection and harmonic suppression measures under harmonic environment
Note : If harmonic power ratio N
LL
＞ 40 %, user must install CKSG series reactor or take harmonic suppression measures .
01
3 . 1 Environmental conditions : See Table 2 for ambient air temperature , relative temperature and altitude .
3 . 2 Installation conditions : On condition that the safety precautions are met , the installation site should be
free from hazardous gases and vapors , conductive or explosive dusts , and strong mechanical vibration .
3 . 3 Application conditions
3 . 3 . 1 The rated voltage of the capacitor must be higher than the voltage of user’s grid . When the
environmental conditions exceed the limits in 3 . 1 , user must derate the capacitor by raising its rated voltage ,
otherwise the service life of the capacitor can be significantly shortened after long - term overvoltage or
overtemperature operation .
3 . 3 . 2 Harmonic current amplification is the primary cause for capacitor damage . Common harmonic sources
include : power electronic equipment , frequency converter ( energy saving transformation , such as motor
speed regulation , variable frequency air conditioner , etc .), DC rectifier , inverter , electrolytic plating
equipment , electric arc furnace and intermediate frequency furnace , etc . See Table 1 for capacitor selection
and harmonic suppression measures under harmonic environment :
Type Key and Definitions
NWC5/NWC6 Series Self-healing Low Voltage Shunt Capacitors
Use Purpose and Application Range
NWC5 / NWC6 series self - healing low voltage shunt capacitors ( hereinafter referred to as
capacitors ) are applicable to power frequency AC power systems with rated voltage up to 1 , 000V
for power factor increase , reactive power loss reduction and voltage quality improvement .
Phase number : 3 - three phase , 1 - single phase , 3T - three phase insert type
Rated capacity ( kvar )
Rated voltage ( kV )
Design serial number : 5 - refers to single layer stretched aluminum enclosure
6 - refers to dry type capacitor
Self - healing low voltage shunt capacitor
Group company code
N WC
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