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CURRENT AND VOLTAGE SENSORS


General Information


Overhead Current and Voltage Monitoring Insulators (CVMI)

Many electric utilities are using Distribution Automation (DA) for both overhead and underground systems. DA systems enable a utility to monitor, coordinate and operate distribution systems in real time mode from remote locations. Utilities that have installed DA systems have experienced the greatest benefits in the following areas:
  • Reduced customer outage minutes per year
  • Increased revenues due to faster restoration in problem areas
  • Reduced customer complaints
  • Reduced system losses

Underground Elbow Sense current and voltage monitors

These benefits are realized by:

  • Automatic feeder reconfiguration
  • Providing data to system operators during emergency conditions for sectionalizing
  • Monitoring and data-logging circuits
  • Detecting equipment failures, transients or harmonics
  • Reducing VARs in substations and feeders by intelligent control of capacitor banks
Full scale implementation of DA has been limited by the high initial cost of equipment. But in the last few years the cost of remote terminal units (RTU) and communication equipment has decreased steadily while reliability has been increasing.

A former obstacle has been a lack of economical devices to accurately measure current and voltage in remote locations. However, Lindsey Manufacturing Co. has eliminated that obstacle, and created a complete line of accurate, cost effective, overhead and underground Current and Voltage Sensors. These Lindsey Current and Voltage Sensors can easily be retrofitted to existing equipment or built into new equipment.

Overhead Current and Voltage Monitoring Insulators (CVMI)

Lindsey Current and Voltage Monitoring Insulators (CVMI) are approved for distribution systems operating at 15, 25, 35 and 46kV, and each meet the BIL test requirements for its insulator class. Different styles of CVMI's have been developed for a variety of applications


Clamp Top CVMI for replacing any horizontal or vertical line post insulator
Bus Bar style CVMIs are equipped with standard 2 or 4 hole NEMA pads
Substation/Switchgear style CVMIs are used where a conductor can be threaded through and clamped to the stainless steel tube

Multicore Sensor eliminates the need to cut the conductor or make a jumper through a tube
Voltage Sensing Standoff Insulators are interchangeable with porcelain standoffs with a 3 in. bolt circle
Standard Voltage Monitoring Insulator (SVMI) for recloser applications Requiring voltage sensing on both sides of a recloser

Typical Applications of Lindsey CVMIs & SVMIs



Substation/Switchgear style CVMI on air break and vacuum bottle switches and for SCADA in substations with 1% accuracy


Bus Bar style CVMIs and Voltage Sensing Standoff Insulators used in conjunction with an SF6 switch


  Lindsey Standard Voltage Monitoring Insulators (SVMI) are used on a team of three reclosers to determine location of a fault and automatically reconfigure the feeder.
  Clamp Top CVMIs for monitoring feeders with 1% current and voltage accuracy


Underground Elbow Sense Current & Voltage Monitors

Lindsey ElbowSense Current and Voltage Monitors use proven CT and voltage sensor technology from the original Lindsey CVMI and fit standard 600 amp T-body 15, 25 and 35kV connectors. They are easily retrofitted to existing padmount or submersible equipment. These sensors may also be used with outdoor, overhead mounted equipment that use standard elbows.



The ElbowSense voltage monitoring plug replaces the standard plug insert furnished with all 15 to 34.5kV, 600 Amp T-Body elbow assemblies. Instead of relying on an inaccurate capacitive test point, the encapsulated, precision, resistive voltage divider provides a 1% accurate AC signal proportional to phase-to-ground voltage.



The ElbowSense Current Monitoring Ring is a special purpose window type current transformer sized to fit over 600 amp or 200 amp elbow connectors. These ElbowSense Current Monitoring Rings are sealed and encapsulated in a durable, waterproof housing and fitted with a watertight connector.




Typical Applications of Lindsey Elbow Sense Current & Voltage Monitors



 ElbowSense voltage monitoring plug installed in a 35kV pad-mounted switch enclosure
ElbowSense Current Monitoring Ring used in a Two Way Submersible switch.  




Smart-Point ® Power Monitoring System

Measure Thirteen Power Parameters including % THD and K Factor, From your desk top without an installed SCADA system
Smart-Point® Measurements
  • U.S. & International Pat. Pend.
  • Measure Thirteen Power Parameters including % THD and K Factor,
  • From your desk top without an installed SCADA system
  • 3 Ø Voltage (L-N)
  • 3 Ø Voltage (L-L)
  • 3 Ø Current
  • Neutral Current
  • Bidirectional kW (3 Ø and Total)
  • Bidirectional kVAR (3 Ø and Total)
  • kVA (3 Ø and Total)
  • PF (3 Ø and Total)
  • Bidirectional kWh
  • kVha
  • Frequency
  • % THD
  • K Factor
  • Harmonic Measurements,
  • Voltage and Current, Each phase,
  • through 31st Order
click here to view details


Underground: DC Power Supply

The DC Power is proportional to the current through the CTs. The power supply can deliver 20W DC power with only 50A through primary underground cable, 50W with 300A and 65W with 600A through primary underground cable. The three sealed, split-core CTs can be installed on a single phase or on three separate phases. Watertight cables connect the CTs to the watertight DC Power Supply enclosure. The enclosure is connected to the motor operator, communications system or battery with a watertight 12ft (3.6m) cable and terminals.

Features:

  1. 12V, 20-65W DC Power for motor operations and communications systems.

  2. 12V, 33 amp-hour battery charger with 6.0A currents limiter and temperature compensation.

  3. Applicable for 200A or 600A, 15kV-35kV underground systems.

  4. Easy installation (split-core CTs fit over the underground cable), no maintenance or calibration.





Copyright © 2005 Lindsey Manufacturing Co.