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Application Note - PM130 PLUS Auto Load Shedding

Application Note - PM130 PLUS Auto Load Shedding
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Application Note - PM130 PLUS Auto Load Shedding - 1

■ Auto peak shedding (load shedding) using SATEC PM130EH PLUS ■ Load shedding based on Maximum Demand (MD) or Time ■ Save penalties and high energy cost usage ■ Display of more than 120 electrical parameters ■ Time synchronization Control Your Load— Reduce Energy Cost In today's world of high cost of electrical energy, it is often required to shed load to save cost of energy consumption Load shedding may be resorted to avoid high penalties due to MD restrictions or high cost of electrical energy during peak hours. Shedding un-essential load (e.g. utility water pumps, AC etc.) during peak energy cost time can result in significant saving in electrical bills. Smart Multi-Function Meter SATEC PM130EH PLUS provides features which can be used to achieve both these cost saving requirements. It can be used to shed load based on MD and also at fixed time (peak energy cost time). Panel mounted, four quadrants SATEC PM130EH PLUS displays all required electrical parameters with accuracy class 0.5S. Its RS-485 serial port can be used to read all required parameters via MODBUS RTU, DNP 3.0, Profibus DP or IEC 60870-5-101/4 protocols. Plug-in module with four digital inputs (DI) and two relay outputs (RO) is available for use with the meter. This module is installed at the side of the meter (see picture on next page). Four DI can be used to monitor feeder status and time synchronization of the meter RTC (by using minute pulse input). Two relay outputs can be used to control loads based on MD or time. Auto Load Shedding Using MFM PM130EH PLUS // Copyright © 2013 SATEC Ltd.

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Application Note - PM130 PLUS Auto Load Shedding - 2

Connect PM130EH PLUS for Load Control 1. Connect the 4DI+2RO module to side of PM130EH PLUS 2. Make connections to the I/O module as shown in figure 1 3. Ensure that load does not exceed the output relay contact ratings 4. Use external load control relays if load exceeds the relay contact rating Relay contact rating: 5A/250 VAC; 5A/30 VDC, 1 contact (SPST Form A) Galvanic isolation: Between contacts and coil: 3000 VAC 1 min Between open contacts: 750V AC Relay Operate time: 10 ms max. Relay Release time: 5 ms max. Configure PM130EH PLUS for MD Control Figure 1: Relay control outputs for...

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Application Note - PM130 PLUS Auto Load Shedding - 3

The PM130EH PLUS can be configured for following types of demand control:     Block demand Sliding Block demand Accumulated demand Predicted demand Similarly load shedding over time can be set to release the relay. This can be used to put on the load. Multiple load shedding schedules can be configured using this Control/Alarm set point screen. Required operate and release demand limits can be configured under “Control/Alarm Set points” using PAS software as shown in figure 2. Meter RTC should be synchronized via MODBUS communication RS485 port or (DI using minutes pulse). Multiple...

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