SEECO SENSE sensor

The fiber optic cabling and potting (figure 4 front view and 4A back view) provides an insulated pathway for the communication of the current digital signal from the line unit electronic card to the base unit card. A ?" diameter hole is centered and bored axially through the insulator core. Three single strand fiber optic cables are run from the top to the bottom of the insulator. An epoxy potting material is used to fill all voids and secure the fibers in place. 

Fiber Optic Cabling and Potting (CS, CSVS)

The low voltage output is read by the Line Unit Electronic Card (figure 3), which is located adjacent and immediately below the current sensing coil.  The card converts the low voltage output from an analog value into a 16 bit digital value.  An extremely high sampling rate insures the current value is accurately reproduced for both amplitude and frequency. 

Line Unit Electronic Card (CS, CSVS)

At the high potential side of the unit is a current sensing coil (Rogowski Coil) which is used to sense the line current and generate a safe, low voltage output.  The coil (figure 2) eliminates the hazards associated with open secondary windings of conventional CT's, and the absence of a magnetic core eliminates circuit loading and saturation concerns. 

Current Sensing Coil (CS, CSVS)

The Sensor Unit is essentially a monitoring insulator.  Depending on the configuration specified, the sensor may include some or all of the following: current sensing coil, voltage sensing rod, silicone polymer station post insulator, two or four hole terminal pads, fiber optic cabling and potting and line and base unit electronic cards. 

Sensor Unit

The major system components and their primary sub-component assemblies are described in more detail below.

All three Sensor Unit configurations share several common design elements.  At a high-level, both the type CS and type CSVS sensors have a current sensing mechanism, which the type VS sensor does not require.  Similarly, both the VS and CSVS sensor units have a voltage-sensing mechanism, which the type CS sensor does not require. 

Three distinct sensor unit configurations (figure 1) are available: current-only, type CS; voltage-only, type VS; and combination current and voltage, type CSVS.  Type CSVS is identical in external appearance to the current-only sensor and is not represented by a separate picture. 

The SEECO SENSE sensor product consists of four major system components, a Sensor Unit (monitoring insulator), an Output Unit, an Enclosure and Power Source and a Communication Cable.  Each sensor unit requires a Communication Cable, however, a single Output Unit may be shared by up to three Sensor Units based on the requirements of a customer's application. 

General