COMPENSATION PANEL DESIGN

COMPENSATION PANELS ENGINEERING DESIGN

Today, compensation panels have become indispensable for increasing efficiency in energy systems, preventing penalty tariffs, and reducing reactive load on the grid. These panels, installed to provide reactive power control in low-voltage systems, are particularly critical for industrial facilities, commercial buildings, and large power consumers.

What is a Compensation Panel and Why is it Used?

A power factor correction panel is a specialized panel that balances reactive power in an electrical installation. It improves the cosφ (power factor) value by balancing the reactive power caused by inductive (coiled) or capacitive effects of the loads connected to the system.

It prevents reactive energy penalties.
It reduces the current drawn from the grid.
It improves the voltage profile.
It enhances energy quality.

Compensation Panel Structure

Compensation panels can be fixed or automatic depending on the load characteristics. In automatic systems, microprocessor-based reactive power relays continuously monitor the power factor and gradually switch capacitors on or off.

The basic components are as follows:

Load Analysis and Harmonic Investigation

Prior to the design phase, measurements are taken using an energy analyzer for the facility. Active, reactive, and apparent power values, as well as harmonic distortion ratios (THDi / THDu), are evaluated.

Capacitor Capacitance Calculation

The required kVAr value is calculated based on the total inductive load amount:

Tier Structure and Selection

Capacitor stages can be planned symmetrically (e.g., 5-5-5-5) or asymmetrically (e.g., 5-10-15). Automatic compensation systems typically use 6 to 12 stages.

Harmonic Analysis and Filtering

Harmonic filter compensation is preferred if there is a risk of harmonic distortion. Otherwise, capacitor lifespan is shortened and the risk of fire increases.

Software Used in Compensation Panels

During the design and analysis phase, manufacturers generally prefer the following engineering software:

EPLAN – Schematic panel design

Caneco BT – Reactive power calculation and protection coordination

PowerFactory / ETAP – Power factor optimization and harmonic analysis

AutoCAD Electrical – Single-line diagram and panel internal layout

Compensation Panel Installation

1. Mechanical assembly of the panel is performed.
2. Capacitor and contactor connections are made with cable cross-sections appropriate to the project.
3. Relay programming is performed (cosφ target is determined).
4. Voltage, current, and THD values ​​are tested.
5. Step sequence and transition time are checked.
6. Heating and connection checks are performed using a thermal camera.

Types of Compensation Panels

Automatic Compensation Panels
Harmonic Filter Compensation Panels
Shunt Reactor Compensation Panels
Thyristor Controlled (Fast) Compensation Systems
Compensation panels for SES (Solar Power Plants)
Active compensation systems for inductive loads

Compensation Panel Prices

The prices of compensation panels vary depending on the following factors:

Total compensation requirement (kVAr)
Automatic or fixed?
With harmonic filter?
Brand of equipment used (Schneider, Lovato, ABB, etc.)
Number of stages and cabling complexity
Installation included or panel only?
Compensation panels are an indispensable component of modern facilities in terms of improving energy quality and optimizing costs. A compensation system that is correctly sized and designed according to engineering rules not only prevents penalties but also extends the life of the system and reduces operating costs. The software used in the design phase, the selection of components suitable for the load characteristics, and harmonic analysis directly affect the system’s performance.