Littelfuse PGR-8800 Arc-Flash Relay
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The PGR-8800 is a microprocessor-based relay that detects arc flashes using an optical sensor, and rapidly trips to limit arc-fault damage. It has adjustable light sensitivity to reduce nuisance trips, and monitors sensors and inputs to ensure fail-safe operation. The relay can be installed in switchgear with minimal configuration using multiple sensors for complete coverage of areas where arc faults may occur.
Littelfuse PGR-8800 Arc-Flash Relay
- 1. Protection Relays & Controls © 2014 Littelfuse Protection Relays & Controls Littelfuse.com/ArcFlash Rev: 4-G-032714 Based on Manual Rev 3-A-112913 Description The PGR-8800 is a microprocessor-based relay that limits arc-fault damage by detecting the light from an arc flash and rapidly tripping. Phase-current-transformer inputs are provided for current-constrained arc-flash protection and, when so equipped, a programmable definite-time overcurrent function can be enabled. An optical sensor on the PGR-8800 and adjustable trip level reduce the chance of nuisance tripping by setting a threshold for ambient light. Sensors, inputs, and connections are monitored to ensure fail-safe operation. A secondary solid-state trip circuit provides a redundant trip path. A USB port is used for configuration and access to event logs and graphs. Optical Sensors The PGR-8800 accepts both PGA-LS10 and PGA-LS20/PGA- LS25/PGA-LS30 optical sensors, designed to collect light over a wide angle and with high sensitivity. For fast fault location, front-panel and sensor LED’s indicate sensor health and which sensor detected an arc fault. Sensor Placement The PGR-8800 Arc-Flash Relay and sensors are easily installed in retrofit projects and new switchgear with little or no re-configuration. Even elaborate systems with multiple power sources take minutes to configure using the relay’s built-in USB interface software. Generally, it is recommended to mount 1 or 2 sensors per cubicle to cover all horizontal and vertical bus bars, breaker compartments, drawers, and anywhere that there is potential for an arc-fault. Threading a fiber-optic sensor through the cabinets and in areas where point-sensor coverage is uncertain results in complete coverage and an added level of redundancy. Even if policy is to only work on de-energized systems, all maintenance areas should be monitored to prevent potential damage and additional cost. At least one sensor should have visibility of an arc fault if a person blocks the other sensor(s). Simplified Circuit Diagram PGA-LS10 (Point Sensor) PGA-LS20/ PGA-LS25/ PGA-LS30 (Fiber-Optic Sensor) PGA-1100 (Diode Logic Unit) (Optional) 24 Vdc Battery Backup (Optional) (Recommended) (Arc-Flash Protection Relay) PGR-8800 Trip 5-A-SECONDARY PHASE CT’s L2 L1 A B C A B Ordering Information PGR-8800 SERIES (D1000) Arc-Flash Relay C D ORDERING NUMBER COMMUNICATIONS PGR-8800-00 (UL, CE, C-tick) Multi-unit linking, Modbus® RTU ACCESSORIES REQUIREMENT PGA-LS10 (A1000) Required* PGA-LS20 (A2000)/ PGA-LS25 (A2000.0020) PGA-LS30 (A2000.0030) Required* PGA-1100 (D1100) Optional Current Transformer Optional *At least one sensor is required. However, the exact number of sensors for proper coverage depends on the application. D D D Local Circuit Breaker For detailed wiring diagram, see adjacent page. Arc-Flash Monitoring
- 2. Protection Relays & Controls © 2014 Littelfuse Protection Relays & Controls Littelfuse.com/ArcFlash Wiring Diagram FEATURES BENEFITS Arc-Flash trip time <1 ms Limits arc-flash damage and risk of injury Multiple sensors (up to 24) Single module can monitor 6 sensors. Up to 4 PGR-8800 units can be linked into one system Fail-safe system Continuous monitoring of optical sensors and inputs ensures protection Redundant trip circuit Solid-state backup arc-detection circuit adds a second layer of safety Adjustable light sensitivity Allows for operation in bright environments and maximum sensitivity in dark environments LED indication (on unit and each sensor) 18 LEDs provide at-a glance status for module and I/O state Current detection Phase-CT inputs provide overcurrent protection and prevent nuisance trips Optical detection Point and fiber-optic sensors provide wide detection area with sensor health trip indication Digital inputs (6) Two each: remote trip, inhibit, and reset inputs Service mode Allows for system test without tripping Trip coil contact Solid-state 24-300 Vdc/24-300 Vac IGBT Indication contacts Form C and status outputs USB interface Data logging and configuration software uses a USB interface with no drivers or software installation Built-in sensor Can be used in single-sensor systems, as a seventh sensor, and for calibration Universal power supply/Battery backup 100-240 Vac, 14-48 Vdc, or 110-250 Vdc supply accepted. Ability to charge and run off an external, user-supplied 24 Vdc battery. Data logging On-board event recorder helps with system diagnostics Modbus Remotely view measured values, event records & reset trips Upstream Tripping Ability to trip upstream device if the local breaker fails to clear the fault Features & Benefits PGR-8800 SERIES (D1000) Arc-Flash Relay 1 31 36 3937 45 46 47 48 49 50 51 52 53 54 55 56 57 59 6038 4 ........ 5 8 ........ 9 12 ........ 13 16 ........ 17 20 ........ 21 24 ........ .................................. 25 26 27 28 29 30 STATUS STATUS STATUS TRIP COILTRIPPEDSERVICE LINK ONLINE + – CONTROL POWER and BATTERY DIGITAL INPUTS ARC-FLASH RELAY PGR-8800 SERIES ARC-FLASH RELAY PGR-8800 (optional) DIODE LOGIC UNIT PGA-1100 (optional) ARC-FLASH RELAY PGR-8800 (optional) ARC-FLASH RELAY PGR-8800 (optional) PHASE CT (recommended) PHASE CT (recommended) PHASE CT (recommended) PGA-LS10 PGA-LS20 PGA-LS25 or PGA-LS30 OPTICAL SENSOR PGA-LS10 PGA-LS20 PGA-LS25 or PGA-LS30 OPTICAL SENSOR PGA-LS10 PGA-LS20 PGA-LS25 or PGA-LS30 OPTICAL SENSOR PGA-LS10 PGA-LS20 PGA-LS25 or PGA-LS30 OPTICAL SENSOR PGA-LS10 PGA-LS20 PGA-LS25 or PGA-LS30 OPTICAL SENSOR PGA-LS10 PGA-LS20 PGA-LS25 or PGA-LS30 OPTICAL SENSOR Specifications IEEE Device Numbers Overcurrent (50), Arc Flash (AFD) Input Voltage 100-240 Vac, 14-48 Vdc, and 110-250 Vdc Dimensions H 130 mm (5.2”); W 200 mm (7.9”); D 54 mm (2.2”) Optical Trip Settings 9-25 klux, 800 μs-20 s Current Trip Setting (A) Programmable Indication Contact Mode Fail-safe Trip Coil Voltage(1) 24-300 Vdc, 24-300 Vac Trip Coil Contact Mode Selectable fail-safe or non-fail-safe Redundant Trip Circuit Standard feature Input Monitoring Standard feature USB Interface Standard feature Trip, Reset, Service Buttons Standard feature Expandable System Link up to 4 PGR-8800 units Warranty 5 years Mounting DIN (with D0050 adapter clips), Surface PGA-LS10 (A1000) Point Sensor Line-of-sight light sensor detects an arc as small as 3 kA within a 2-m half-sphere. Sensor health and trip indication. Dimensions: See PGR-8800 Manual PGA-LS20 (A2000)/PGA-LS25 (A2000.0020)/PGA- LS30(A2000.0030) Fiber-Optic Sensor 360° light sensor for tricky installations with many shadows or to run along bus bars. Sensor health and trip indication. Dimensions: See PGR-8800 Manual PGA-1100 (D1100) Diode Logic Unit This module allows multiple PGR-8800 relays to trip the same breaker, for example an upstream or a tie-breaker. Dimensions: H 80mm (3.15”) W 20mm(.79”) D 70mm(2.76”) CurrentTransformers Eliminate nuisance arc-flash trips and use for overcurrent protection. Accessories A B D C Littelfuse reserves the right to make product changes, without notice. Material in this document is as accurate as known at the time of publication. Visit Littelfuse.com for the most up-to-date information. NOTE (1) - Contact Littelfuse for trip coil voltages higher than 300 Vdc/Vac. Rev: 4-F-012214 Based on Manual Rev 3-A-112913 Arc-Flash Monitoring