Process technique electronics in technical association with beluk gmbh of germany, manufactures wide range of reactive power control relays of various types, which operate on the following measuring and controlling principle. Reactive and active power are calculated from voltage and current. Capacitors in any size can be used in the automatic mode of operation. No pre-selected switching programme is required, because the controller will always select the optimum switch sequence. When switching capacitors, the reactive var output of each step is determined and stored. This enables permanent supervision of the reactive power output of each individual capacitor step. In this way the number of switching operations is considerably reduced. Due to the supervision of capacitor stages, the power factor control relays blr-ca, cb, cc, cd and cm do not require a fixed switching sequence when energising capacitor steps for compensation. The power factor control relays are preset at the factory for immediate service following installation.
