Demand Monitor & Demand Controller

Elmeasure offers a variety of demand controllers to suit different applications. Demand control is a method of controlling the energy cost by limiting the energy consumption within the demand set by the regulatory board. Demand cost is calculated in different ways and using different parameters depending on the region/ country.

There are two types of demand measurement

• Sliding Window
• Fixed (Block) Window

Sliding Window

This window slides every 15 seconds (update time), so it automatically synchronizes with EB meter. But it will not return to zero at the end of the demand period. For the fluctuating load this is the better way of measurement.

Fixed (Block) Window

This window slides every demand period. It has to be synchronized to EB meter manually. It will return to zero at the end of demand period. This can be used for the fairly stable load.

Normally there are two types of demand control used

• Forecast Demand Control
• Step Demand Control

Forecast Demand Control

Forecast demand control is more suitable for sliding window technique. This control predicts the rising demand before the set time (Forecast Interval) and gives the alarm/annunciation for proactive action. The user can then shed some non-critical loads.

Step Demand Control

Step demand control is suitable for sliding and fixed window. 4 loads or 4 set of loads can be connected to the relays for tripping. Each step tripping level can be programmed independently (5% to 100% of Full scale). In the step demand control the control is based on the rising demand only.

Intelligent

• Built-in Voltage & Current phase analyzer measures 4 quadrant power & 2 quadrant energy (4 quadrant energy for R/D option)
• Auto scrolling
• Communication with PCs, PLC’s, DCS thru optional RS485/RS232 serial interfaces
• Transducers options RS485/RS232 serial interface
• Demand control option - sliding or fixed window
• Programmable demand period and block (forecast) time
• Field programmable Watts demand (or) VA demand (or) Amps demand
• Field programmable forecast based demand or independent step demand control
• Energy TOD (6 slots) options
• Demand TOD (4 slots) options

Smart

• Accuracy class 1.0 IEC 61036 / CBIP 88 (0.5, 0.2 option)
• True RMS measurement
• Simultaneous sampling of Volts & Amps
• Best parameters grouping / bright displays
• Simultaneous display of 4 parameters
• User programmable password protection
• Auto-scaling of Kilo, Mega, Giga and Decimal Point
• Neutral Current display, RPM measurements
• Low PT, CT burden
• Clearance and creepage distance meets UL 508 safety standard
• Finger touch proof terminals for Voltage and Current connections

Rugged & Safety Construction

• Emission: CISPR 22
• Fast transient: 3kV Min
• IEC 61000 - 4 - 4
• LEVEL 3 ESD
• IEC 61000 - 4 - 2
• Impulse voltage : 6kV, IEC60060, 1.2/50
• Isolation voltage: 4kV, 50Hz, 1 Min

Compact

• 96 x 96mm bezel
• 45mm behind bezel
• Sealed dust-proof rugged construction
• Quick and easy installation using self locking side locks
• Light Weight - Approx 300gms unpacked
• Polycarbonate Casing

Universal

• Field programmable Star (Wye) or Delta or single phase configuration
• Programmable PT, CT ratio up to 2,000 MVA
• Programmable CT secondary
• Auxiliary supply 80-300V AC/DC
• Wider input voltage range 80 - 550VLL