There are several benefits of installing active filters from Hitachi Energy:

Operational efficiency

• Fewer events of equipment failure due to poor power quality of the network, thereby creating trouble-free and efficient operations
• Improved performance of loads thanks to a cleaner supply network

Cost efficiency

• Increased lifetime of the equipment enabling lower plant running costs
• Compliance with the strictest regulations (such as individual harmonic limits) thanks to the unique control concept, thereby avoiding penalties and/or refusal by utilities to connect installations to the electrical grid

Energy efficiency

Lower energy losses in cables and transformers and hence a higher efficiency of the system but also a reduction of CO2 emissions

Better safety of the installations and better operation.of sensitive loads as the voltage drop between neutral and earth is reduced

Harmonic filtering efficiency

The active filters PQF have high filtering efficiency due to the following features:
• Capability of filtering up to 20 harmonics simultaneously
• Selection of harmonics up to the 50th harmonic
• Harmonic attenuation factor better than 97%
• Desired harmonic levels can be preset for each selected harmonic

Reactive power compensation

PQF can perform precise stepless reactive power compensation of both inductive and capacitive loads. The target cos is programmable from 0.6 (inductive) to 0.6 (capacitive) which makes PQF an alternative to a conventional capacitor bank.
Moreover this allows compensation of loads fed by generators without the risk of overcompensation. In addition, capacitive-loads can also be compensated.

Load balancing

This feature is available in both 3 and 4-wire systems between phases and between phase and neutral. It helps to improve voltage unbalance on the phases and reduction of neutral current which increases the safety of the installation and allows sensitive loads to operate.

User interface

The user-friendly PQF-Manager interface is provided as a standard accessory with all types of active filters. It offers direct access to filter control, programming, and monitoring functions without a PC. Communication facilities and detailed fault and event logging with real time stamp are also available.
The large dimensions (320×240 pixels) display offers a high level of readability thanks to the clear positioning of information, prompts and icons.

Communication

The PQF-Manager is provided with Modbus RTU and Modbus TCP communication features. Through a Modbus RS-485 converter (optional) or Ethernet, the PQF can be linked to the supervision system of the customer. All parameters, settings and measurements are accessible remotely.
Apart from the Modbus communication features, the PQF is also provided with two additional communication ports, a mini-USB and an RJ45 (Ethernet) port. Using Hitachi Energy proprietary Windows® based software called PQ-Link and a computer, one can communicate with the filter locally or from a remote location. An IP address is required to use connectivity over Ethernet communication channel.

PQ-Link software

The PQ-Link software offers direct control and monitoring of the filter from a local or a remote computer. The connection is through a USB port or Ethernet (RJ45) port provided through the PQF-Manager. This Windows based software allows the user to access the filter, monitor all parameters and change
“user specific” parameters of the filter. Multicolored displays for voltage, current and various other parameters- which are available directly on the PQF-Manager- makes the PQ-Link a customer friendly and useful tool. Connection to the filter from a remote location is possible by assigning a specific IP address to the filter.