Point-On-Wave Switching Device


Energizing the different elements of the electrical power system, like transformers, capacitor banks or reactors, goes always together with the risk of transient overvoltages and overcurrents. De-energizing these elements can result also in overvoltages and restriking. For instance, Energizing an unloaded transformer often causes inrush currents of extreme high magnitudes. This is harmful to the mechanical structure and insulation of the windings, and shortens the lifespan of the transformer.

The most efficient handling of these problems is the elimination of the root cause: finding an optimal moment for the energizing and the de-energizing. The aim of the controlled switching is to find this moment (point-on-wave) and to delay the close and the open command to the circuit breaker accordingly. The different electrical equipment needs naturally different energizing strategy because of their different physical characteristics. The Point-on-Wave switching (PoW) functionality is applicable for controlled energizing and de-energizing of reactors, capacitors and power transformers (as TRIM function).

Product details


♦ Native IEC 61850 IED with Edition 2 compatibility.
♦ Scalable hardware to adapt to different applications.
♦ 84 HP or 42HP wide rack size (height: 3U) with several mounting methods: Rack; Flush mounting; Semi-flush mounting; Wall mounting; Wall-mounting with terminals; Flush mounting with IP54 rated cover.
♦ The pre-defined factory configuration can be customized to the user’s specification with the powerful EuroCAP tool
♦ Flexible protection and control functionality to meet special customer requirements.
♦ Advanced HMI functionality via color touchscreen and embedded WEB server, extended measuring, control and monitoring functions.
♦ User configurable LCD user screens, which can display SLDs (Single Line Diagrams) with switchgear position indication and control as well as measuring values and several types of controllable objects.
♦ Various protection setting groups available.
♦ Enhanced breaker monitoring and control.
♦ High capacity disturbance recorder (DRE) and event logging (data is stored in non-volatile memory):
      ° DRE for up to 32 analogue and 64 digital signal channels with duration up to 10s and sampling rate up to 2kHz.
      ° Event recorder can store more than 10,000 events.
♦ Wide range of communication protocols:
      ° Ethernet communication: IEC 61850; IEC 60870-5-104; DNP3.0 TCP; Modbus TCP
      ° Serial communication: DNP3.0; IEC 60870-5-101/103; MODBUS, SPA.
♦ Legacy network based protocols via 100Base-FX and 10/100Base-TX (RJ45). Optional communication ports: Fiber optical Ethernet (MM/ST, SM/FC), RJ45, Serial POF, Serial glass fiber, RS-485/422.
♦ The EuroProt+ family can handle several communication protocols simultaneously.
♦ Built-in self-monitoring to detect internal hardware or software errors.
♦ Different time sources available: NTP/SNTP server; Minute pulse; Legacy protocol master; IRIG-B.

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