How does a shunt capacitor bank work

Shunt capacitor bank applications and protection basics

Shunt capacitor banks

The paper offers a quick and easy way to calculate the imbalance voltages (voltage protection) or the current (current protection) that result from defective capacitor units or elements. While identifying faulty capacitor units is easy with an externally fused bank, it is more complex with the other types of fuses, making maintenance and troubleshooting difficult.

Shunt capacitor bank applications and protection basics

This items represents proposed a novel method of identifying the defective phase and the defective section in capacitor banks .

Shunt capacitor banks are used to improve the quality of the electrical supply and the efficient operation of the power system . Studies show that a flat voltage profile on the system can significantly reduce line losses. Shunt capacitor banks are relatively inexpensive and can be easily installed anywhere on the network.

In this Articles cover the principles of shunt capacitor bank design for substation installation and basic protection techniques . Protection of the shunt capacitor bank includes: a) protection against internal bank faults and faults occurring within the capacitor unit; and, b) protecting the bank from system disruptions.

Section 2 of the paper describes the capacitor unit and how they are connected for different bank configurations. Section 3 covers bank designs and ground connections. Bank schemes that initiate a shutdown of the bank in the event of disruptions within the bank that can lead to catastrophic failures are shown in section 4.

The document does not deal with the means (fuses) and strategies to protect individual elements or capacitor units, nor the protection of capacitor filter banks. System malfunctions and basic capacitor bank control strategies are also discussed.

Grounded Wye Shunt Capacitor Banks


Shunt capacitor banks (SCB) are mainly installed, to provide capacitive reactive compensation / power factor correction . The use of SCBs has increased because they are relatively inexpensive, easy and quick to install, and can be deployed virtually anywhere on the network.

The installation has other positive effects on the system, such as: B .: Improving the voltage on the load, better voltage regulation (if appropriately sized), reducing losses, and reducing or deferring investment in transmission.

The main disadvantage of SCB is that its reactive power output is proportional to the square of the voltage and, consequently, when the voltage is low and the system needs it most, it is the least efficient.

Title:Shunt capacitor bank applications and protection basics - Satish Samineni, Casper Labuschagne and Jeff Pope (Schweitzer Engineering Laboratories, Inc.) and GE Multilin (Gustavo Brunello, Bogdan Kasztenny and Craig Wester)
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Shunt capacitor bank applications and protection basics