The HPB (6.6kV, 11kV, or 22kV) is an intelligent protection relay based on microprocessor technology.
The integrated relay provides the necessary functions required for protecting electrical outlets supplying draglines, shovels, drills etc. All of the protection functions are combined into a compact, plug-in unit which can be easily changed out to minimise down time in the event of a problem with the relay.
The HPB relay can provide machine communication through the use of a HPB Termination Unit (HTU-1) connected between the pilot and earth at the machine end of the trailing cable. Through the use of the HTU-1 Termination Unit the relay parameters are automatically up loaded from a remote machine when a cable is inserted into a power outlet.
The relay can perform an automatic “H.V. Insulation” test on the cable prior to the closure of the main contactor. The results of the test are displayed on the HPB Display Module (HDM-1) and can be remotely monitored.
The HPB relay has 5 digital inputs, which feed into a microprocessor unit. The microprocessor has been programmed to control three output relays. Relay MCR for the main contactor and Relay CBR for the circuit breaker. RL3 is used to control the supply to the Cable Connection Module enabling it to perform the Earth Fault Lockout test. All of the tripping logic and outlet control is performed by the microprocessor, so that only minimal external control is required.
Extensive information display and monitoring features are included to facilitate fault finding and system trending. This information can be read locally on the HPB Display Module (HDM-1) or remotely via a communication link.
Opto-isolated outputs are available for connection to optional LED or Relay Modules to provide additional “run” and “trip” indications. The Ampcontrol Relay Output Module (ROU) enables these indications to be interfaced with a PLC.
The HPB integrated protection relay is normally installed in a mobile substation and provides protection for draglines, drills, shovels and other surface mining equipment connected to the substation.
