Energy Meter protects against revenue losses.

Press Release Summary:



Model SEL-734 Revenue Metering System monitors and records energy and demand usage, activates backup systems during peak demand, and monitors for potentially damaging conditions before equipment is harmed. Capable of recording single-phase quantities, system can issue alarm if power in one phase drops to zero. Model SEL-734 has 12-channel load profile recording system with interval lengths of 5 min to 1 hr. It is MV-90 compatible and offers DNP and Modbus communications.



Original Press Release:


New Meter Assists in Improving Electrical System Reliability and Protecting Against Revenue Losses


The SEL-734 can reduce costs and improve system reliability by monitoring and recording energy and demand usage and activating backup systems during peak demand, and monitor for potentially damaging conditions before equipment is harmed.

Schweitzer Engineering Laboratories (SEL), Pullman, Washington, announces the SEL-734 Revenue Metering System, a versatile and robust new device that can enable industrial power systems to realize substantial savings through precise measurement and recording of energy usage and demand, and many other power monitoring and control applications.

Unlike traditional revenue meters, the SEL-734 enables users to recognize revenue losses incurred through power system deficiencies, such as an open CT circuit or partial short. Capable of recording single-phase quantities, the SEL-734 can issue an alarm if the power in one phase drops to zero. The system also enables customers to use set points to detect abnormal levels of load imbalance. Multiple output options allow system engineers to program automatic control actions. Alarm conditions can initiate control functions through contact outputs, serial port messages through a SEL-2030 Communications Processor, or automatic phone notification delivered via modem or the new SEL-3010 Event Messenger. The SEL-734 is MV-90 compatible and communications protocol options include DNP and Modbus.

The SEL-734 provides quick detection of power excursions and can provide control functions to prevent downtime and equipment damage. The SEL-734 also incorporates unique functionalities that can be used to switch power supplies to backup generation during intervals of peak demand, and monitor for potentially damaging conditions before they can harm power system or industrial equipment.

Using SELOGIC® control equations, customers will be able to improve power system service by customizing SEL-734 controls based on combinations of system quantities and automatic control options. Recording demand can be compared and set to alarm and shed load if a high peak demand is predicted. Another advantage to the SEL-734 is that voltage excursions can be totaled to indicate service quality of the power source.

The SEL-734 Revenue Metering System has a powerful 12-channel load profile recording system with interval lengths of five minutes to one hour. With five-minute data, power systems operators will have 35 days of load profile capability. Recording channels can be selected as watt-hours (in and out), VAR hours (leading, lagging, in and out), or other display quantities.

The SEL-734 also features harmonic metering capabilities to improve service and reliability. Total Harmonic Distortion (THD) on a per-phase basis for both voltage and current is available for display and retrieval over the serial port. In addition, the meter calculates the K-factor for the load through the 15th harmonic to determine harmonic load impact on transformers. This feature enables checking for potentially damaging conditions before equipment is harmed. The K-factor can also be used to alarm when the harmonic current reaches preset values, and can be combined with total load, in an analog SELOGIC control equation, to prevent nuisance alarms. A multiple of harmonic power can be added to fundamental power to predict transformer heating and alarm on overloads.

The SEL-734 can simultaneously operate on a feeder as a revenue meter and act as a high-function capacitor bank controller. The SEL-734 can use any measuring unit within it as a part of a SELOGIC control equation in order to operate a control contact. In the case of a capacitor bank, this might include voltage, power factor, VAR flow, time of day, date, feeder loading, or any mathematical and logical combination of these.

All of the suggested applications for the SEL-734 demonstrate the versatility of this new robust device that carries the SEL ten-year product warranty. The SEL-734 can enable industrial power systems to realize substantial savings through precise measurement, monitoring, recording, and control of power system equipment operations.

About Schweitzer Engineering Laboratories (SEL) Industrial Solutions Group:

For more information about this and other SEL products or the location of the SEL representative nearest to you please visit our website at www.selindustrial.com, or contact the SEL Industrial Solutions Group by phone (615) 507-2184; fax (615) 507-2188; e-mail Marketing@selindustrialcom; or mail to 130 Seaboard Lane, Suite A7, Franklin, TN 37067.

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