FCI LT LM UNDERGROUND

Transcription

1 FCI LT LM UNDERGROUND Faulted Circuit Indicator for Underground Applications Catalogue # s # PPZ, # PPZ, # , # Description The Navigator LT LM (Load Tracking, Load Memory) is the latest generation of faulted circuit indicators, utilizing many years of experience, from the Horstmann Company. Designed for underground distribution circuits, the LT LM PPZ fault indicator quickly and accurately aids trouble crews in determining the status of the system and the location of faults. Installed on bare or covered conductor the unique design allows for easy installation and/or removal with a hot stick or Grip All Tool. These FCI s are held in place by an extremely strong spring loaded mechanism for mounting surfaces, the Navigator can be mounted at any angle from vertical to horizontal. The LT LM housing is sealed to operate in adverse outdoor conditions. The housing materials are corrosion and UV protected polyamide, polycarbonate and stainless steel. There are no moving mechanical parts to wear or fatigue, therefore trip current calibration remains constant throughout the life of the indicator. FCI LT LM Series Fault Indicators are primarily designed for utility underground cables, where phase to phase spacing is limited. The closed core, cable clamping mechanism is designed to significantly reduce the proximity effect of adjacent cables and for easy installation and/or removal with a hot stick. Coordination with circuit protection devices is accomplished through the use of a single fault trip curve. The shape of the curve is referred to as Protection Mated. Protection Mated (PM) means the curve s shape is designed to coordinate with today s electronic protection devices and to avoid improper indication on circuit inrush. Through closer coordination and PPZ reset the frequency of false tripping is greatly reduced. Constantly monitoring current magnitude (load), the fault indicator is installed at a point on the cable where the ground current return path has no influence. The fault curve is adjusted electronically in relation to the load and thus referred to as load tracking (LT). Page 1 FCI LT LM, UNDERGROUND NAVIGATOR August 2, 2016 D.Tyers

2 Load Memory (LM) describes how quickly the characteristic curve is adjusted. The highest continuous current sensed for at least 60 seconds will establish a fault curve position in memory and hold it for 72 hours. If the load current reaches or exceeds the stored value, a new fault curve position is registered and the memory time of 72 hours starts again. If load current does not meet or exceed the established level for 72 hours, the LT LM will then sense and re establish a new lower fault curve position. The electronic system is encapsulated in a resin compound enabling the fault indicator to operate fully submersed according to IEEE standard. There are no moving mechanical parts to wear. Not dependent on cable size, one size fits all. Fault detection is indicated by a super bright flashing RED LED, giving excellent all round visibility. All Version LT LM indicators are reset by time, factory set at 4 hours. Catalogue units also reset by current during a one time sequence known as Pulse Pause Zero. After detection of a fault (Pulse) and a 28 second delay (Pause), a current sensor is enabled for a further 28 seconds to reset the FCI if cur rents > 5 A, 60 Hz. are detected. If currents < 5 A are detected (Zero) no reset signal is sent. Thereafter the current sensor is disabled from resetting the FCI, and reset occurs by timing out of the counter or by manual means. Remote indication is available as a separate fiber optic cable assembly that is in stalled on a standard single phase unit by the end user (three phase not available). For connection to Supervisory Control and Data Acquisition (SCADA) systems a Distribution Automation (D/A) relay is available and may be added by the end user at any time. The LT LM UNDERGROUND NAVIGATOR detects fault events and provides a digital LED Strobe demonstrating that the fault has passed the given point. The load leveling (LM) and load memory feature enables the unit to automatically set fault trip current rating in relation to peak load current. Once the unit detects fault current above its trip current rating the FCI sends signal to the Red Strobe LED and the RED LED begins to flash. Cold Load pickup will not falsely trigger the flash. The LT LM Navigator detects fault current with an indication of a Red strobe light. The feature of load leveling with load memory (LM) enables the unit to automatically set the fault trip threshold in relation to peak load current. Once the unit identifies fault current above its trip rating threshold, the Navigator LT LM sends a signal to the LED Strobe Light to begin reporting of the condition. Local fault indication is provided by a bright red flashing LED. Two combinations of reset methods are available including current, time and manual. Fault Indication Function (Refer to time current curves) Page 2 FCI LT LM, UNDERGROUND NAVIGATOR August 2, 2016 D.Tyers

3 The LT LM Navigator has a single characteristic trip curve. The shape of the characteristic trip curve is referred to as Protection Mated. Protection Mated (PM) means the curve s shape is designed to coordinate with today s electronic protection devices and to avoid improper indication on circuit inrush. The Navigator constantly monitors the load current on the conductor and electronically adjusts the trip curve position accordingly. We refer to this action of self adjusting as load tracking. The initial or out of the box position of the trip curve is displayed on the next page. Its location is described by the time current coordinates of MS and the green color. This is the position of the trip curve for conductor amperages zero to thirty amps. The table located at the bottom of the figure shows data for other positions the curve would assume when currents larger than thirty amps are detected by the Navigator. It should be noted that while the characteristic curve and load levelling position of the curve has been designed for today s protection devices, utility operating practices may dictate that load levelling will not coordinate in 100% of all operational circumstances. For those cases a (non adjusting) PM curve of fixed magnitude can be provided. Page 3 FCI LT LM, UNDERGROUND NAVIGATOR August 2, 2016 D.Tyers

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7 Faulted Circuit Indicators ACCESSORIES Test & Reset Magnet Cat. # The test & reset magnet is a permanent magnet retained by a specially designedd housing allowing it to fit universal and shot gun type hot sticks. This allows testing of faulted circuit indicators on live circuits following proper hot stick procedures. The purpose is to introduce a magnetic field that will influence individually the ' trip' and 'reset' switches of electronic faulted circuit indicators. Page 7 FCI LT LM, UNDERGROUNDD NAVIGATOR August 2, 2016 D.Tyers

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