A110-30-11-230V-50HZ ABB, A110-30-11-230V-50HZ Datasheet - Page 28

• Manufacturer Part Number: A110-30-11-230V-50HZ
• Description: CONTACTOR, 55KW, 110A
• Manufacturer: ABB

Specifications of A110-30-11-230V-50HZ

• Operating Voltage: 230VAC
• Switching Power Ac3: 55kW
• Switching Current Ac1: 160A
• Switching Current Ac3: 110A
• No. Of Poles: 3
• Contacts: 1NO / 1NC
• Relay Mounting: DIN Rail
• Coil Voltage Vac Nom: 230V
• Svhc: No SVHC
• Contact Configuration: 1NO / 1NC

Capacitor Transient Conditions
In Low Voltage industrial installations, capacitors are mainly used for reactive energy correction (raising the power factor). When these
capacitors are energized, overcurrents of high amplitude and high frequencies (3 to 15 kHz) occur during the transient period (1 to 2 ms).
The amplitude of these current peaks, also known as "inrush current peaks", depends on the following factors:
•
•
•
There are 2 types of power factor correction: fixed or automatic.
Steady State Condition Data
The presence of harmonics and the network's voltage tolerance lead to a current, estimated to be 1.3 times the nominal current I
capacitor, permanently circulating in the circuit.
Taking into account the manufacturing tolerances, the exact power of a capacitor can reach 1.15 times its nominal power.
Standard IEC 831-1 Edition 04/97 specifies that the capacitor must therefore have a maximum thermal current I
Consequences for the Contactors
To avoid malfunctions (welding of main poles, abnormal temperature rise, etc.), contactors for capacitor bank switching must be sized to
withstand:
• A permanent current that can reach 1.5 times the nominal current of the capacitor bank.
• The short but high peak current on pole closing (maximum permissible peak current Î ).
ABB offers 3 contactor versions according to the value of the inrush current peak and the
power of the capacitor bank
A... and AF... standard contactors (A 12... A 300 and AF 400 ... AF 750)
UA... Contactors for capacitor switching (UA 16 ... UA 110)
UA...-R Contactors for capacitor switching (UA 16-R ... UA 75-R) with insertion of damping resistors
ABB LIMITED
Fixed power factor correction consists of inserting, in parallel on
the network, a capacitor bank whose total power is provided by
the assembly of capacitors of identical or different ratings.
The bank is energized by a contactor that simultaneously
supplies all the capacitors (a single step).
The inrush current peak, in the case of fixed correction, can
reach 30 times the nominal current of the capacitor bank.
I
The network inductances.
The transformer power and short-circuit voltage.
The type of power factor correction.
T
= 1.3 x 1.15 x I
www.abb.com/lowvoltage
Fixed power factor correction
n
= 1.5 x I
n
AC-6b Utilization Category according to IEC 60947-4-1
Contactors for Capacitor Switching
email [e-mail]
An automatic power factor correction system, on the other hand,
power factor to be corrected.
An electronic device automatically determines the power of the
reach 100 times the nominal current of the step to be energized.
consists of several capacitor banks of identical or different ratings
(several steps), energized separately according to the value of the
steps to be energized and activates the relevant contactors.
The inrush current peak, in the case of automatic correction,
depends on the power of the steps already on duty, and can
Telephone [phone]
Automatic power factor correction
Facsimile 02476 368401
T
of:
Return to main index
Return to main index
n
of the
2/28