MV PFC Capacitors

MV PFC Capacitors

The three-phase capacitors are a simple and cheap solution to create groups of three-phase power factor up to 500 kvar.

INFORMATION

Capacitors of the BIORIPHASO/TF type series constitute a complete range for making of solutions for power-factor correction in MV and HV. They are designed and manufactured using the most modern technologies: ensuring long expected life and high reliability. The BIORIPHASO/TF series is in compliance with applicable standards (IEC 60871, ANSI, IEEE 18, NEMA CP-1, etc.): they are therefore suitable for installation in any environment or conditions described in the above standards. On request, we can, nevertheless, provide capacitors with special characteristic or tested as specified by the customer.

Single phase MT capacitors

  • Unit nominal power up to 800kvar
  • For networks with nominal voltage up to 36kV and 50 or 60Hz frequency

ICAR makes two types of single phase capacitors:

  • without internal fuses
  • with internal fuses.

The choice of the type of the capacitor depends on the choices of the battery, its power and network voltage.

BIORIPHASO/TF SINGLE PHASE WITHOUT INTERNAL FUSES

In case of capacitors without internal fuses, higher power capacitor banks use one single external expulsion fuse for each capacitor; this fuse, which is specific for power capacitors, is very easy and effective, and it allows an immediate evidence of faulty capacitor. In these type of banks the number of capacitors is chosen so to allow the bank to keep on service even in the case one capacitor has been insulated by its fuse melting.

Capacitors without internal fuses, which have smaller losses than those with internal fuses, are designed to lower dielectric withstand and are so much more robust and reliable.

Single phase without internal fuses capacitors are made in units of power ranging from 50 to 500 kvar, and with rated voltage from 1.5 kV to 25 kV.

BIORIPHASO/TF SINGLE PHASE WITH INTERNAL FUSES

In these capacitors each capacitive element inside the capacitor has an internal fuse in series. The high reliability of these solutions allows to design capacitors with an higher dielectric stress and so units of reduced volume and higher reactive power per volume unity.

Single phase with internal fuses capacitors are made in units of power ranging from 400 to 800 kvar, and with rated voltage from 1.5 kV to 25 kV.

Three phase MT capacitors

  • Unit nominal power up to 600kvar
  • For networks with nominal voltage up to 24kV and 50 or 60 Hz frequency

The three-phase capacitors are a simple and cheap solution to create groups of three-phase power factor up to 500 kvar. They are normally used for power factor correction of motors or no load MV/LV transformers. Inside the three-phase capacitors are composed of three single phase units connected in delta or star or star with neutral brought out. The three-phase capacitors for voltages up to 12 kV are usually delta connected and protected with current-limiting type fuses (HRC fuses with a high switching capacity). It’s important to use this type of fuses to prevent the explosion of the capacitor that in case of short circuit will absorb the phase to phase short-circuit system current. Capacitors with internal star connection or with neutral brought out are provided on request.

Capacitors for custom power factor correction solutions

  • three phase with accessible neutral
  • single phase with internal double section connection
  • for non-standard environment applications. (high or very low temperature, saline atmosphere, heights exceeding 1000m, high sun exposure, etc…)
  • compliant with IEEE standards or with customer’s specifications
  • overvoltage protection (usually employed for protecting large electric machinery: see dedicated section)


Case history:

Middle East Oil Plants