Automatic PF correction panel 250 kvar, 400 V

Automatic PF correction panel 250 kvar, 400 V. It supplies the reactive power that motors need, so the utility does not have to. That removes the power-factor surcharge on the bill and frees transformer and cable capacity.

Key features

• Rating: 250 kvar, 415 V 50 Hz
• Steps: 5 steps, contactor-switched
• Controller: 12-step with Modbus
• Enclosure: floor-standing IP42
• Automatic step switching to follow the load
• Discharge resistors, fuses and temperature protection

Typical uses

• Plants paying a power-factor surcharge (power factor below 0.9)
• Transformers close to their kVA limit
• Sites with few drives and low harmonics

Connecting to Plantmargin

The controller's Modbus port connects to the RS485 line; Plantmargin also sees the effect on the incomer meter. Plantmargin reads power factor, kvar and steps every 10 seconds through the edge gateway, stores it for years as hourly figures, draws it against its normal band, and uses it in cost per unit, alarms and verified savings. The installer pack for your plant lists the exact register or channel to use.

Sizing

• kvar needed = kW × (tan φ now − tan φ target). Plantmargin works this out from your own incomer data and shows it on the Bills & tariffs page.
• If harmonic distortion (THD of voltage) is above about 3–5%, or drives make up more than about 20% of load, use a detuned bank.

Installation

• Connect on the main LV board near the incomer, with its own breaker and the controller's CT on the incomer.
• Allow ventilation: capacitors age quickly when hot.

Warranty and support

• Manufacturer's warranty, usually 12–24 months from delivery; the exact period is stated on your quotation.
• Supplied with the datasheet and manual; calibration or test certificate where the product has one.
• Installation, commissioning and connection to Plantmargin can be quoted with the product.