* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download AT-6000 GDS Ground Fault Detection System
History of electric power transmission wikipedia , lookup
Buck converter wikipedia , lookup
Power engineering wikipedia , lookup
Wireless power transfer wikipedia , lookup
Electrical substation wikipedia , lookup
Commutator (electric) wikipedia , lookup
Immunity-aware programming wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Printed circuit board wikipedia , lookup
Mains electricity wikipedia , lookup
Opto-isolator wikipedia , lookup
Alternating current wikipedia , lookup
Stray voltage wikipedia , lookup
Rectiverter wikipedia , lookup
Induction motor wikipedia , lookup
Fault tolerance wikipedia , lookup
Electric machine wikipedia , lookup
Ground loop (electricity) wikipedia , lookup
Accumetrics, Inc.: A PCB Group Company AT-6000 GDS Ground Fault Detection System Field ground fault monitoring for synchronous generators/ brushless excitation using digital telemetry Optional 3 Foot Coaxial Extension Cable (Not shown) Receiver Output Cable (Typically 36 feet long) Receiver Field Negative and Rotor Ground Input Leads BS60007 configured transmitter Transmitter (Mounts on rotating diode wheel of generator) Alarm Panel with Integral Power Supply Copper Pipe Pickup Loop with 3 or 4 Foot Coaxial Cable (The phenolic base is 1.3125 x 0.3125 x 1.0” BS60009 “paddle style” receiver Accumetrics developed the GDS for use with large, turbine-driven synchronous generators. The system detects the occurrence of ground fault leakage current between the generator field circuit and rotor ground, and transmits a good/bad fault determination (based upon a fixed leakage current threshold) from the rotor transmitter to the non-rotating receiver. Note: Although the AT-6000 is available, the newer Accumetrics AT-8000, and AT-8300 products are recommended as an upgrade path. These provide ground fault alarms and valuable trending information based on the resistance of the fault, and are not sensitive to the fault location voltage. Contact Accumetrics for information on these. The AT-6000 GDS system uses a wireless inductive coupling technique to convey electrical power to the rotor and transmit data off the rotor. It provides reliable transmission of data which is unaffected by electrical noise, dirt, or contamination. During normal operation, power to operate the transmitter circuitry is transferred from the stationary antenna loop as a radio frequency. ! BT60010 configured transmitter With a copper tubing pickup loop, the Ground Detection system operates under any machine condition; it does not require the generator to be rotating or the field excitation to be activated. The transmitter auxiliary signal monitoring circuit provides a communications interface for a discrete signal from a rotor-mounted electronic module, such as a diode fault detector, and transmits this signal off the rotor to the stationary receiver. The paddle style receiver design requires rotor RPM for operation. The AT-6000 series has been provided to OEM’s and end users since 1999. visit us at www.accumetrix.com 6 British American Boulevard Suite 103-F, Latham, NY 12110 [email protected] 518-393-2200 ACCUMETRICS A PCB GROUP COMPANY Accumetrics, Inc.: A PCB Group Company Ground Fault Detection Method The rotating transmitter module contains circuitry capable of detecting the occurrence of a ground fault condition. The ground fault condition is defined as an electrical leakage path modeled as a resistor RL which may exist from any point along the field winding to the rotor ground. An effective ground fault detector must respond to ground faults at any location on the field winding. The ground fault detection circuitry makes an electrical connection between the rotor ground and the negative side of the field, introducing a small DC voltage that elevates the negative side of the field above ground. In this manner, a current will flow through RL even when the ground fault exists in the negative terminal of the field. This current is measured within the ground detector and activates a ground alarm if the current exceeds a fixed threshold. Specifications Mechanical requirements Rotor Axial Growth 25.4 mm span Radial Gap 15 mm nominal Ambient Temperature transmitter/antenna: -40 to 70 °C power supply/receiver: 0 to 70 °C Minimum threshold for detection 60 kOhms typical Bias voltage 12 V typical Signal levels 0 V low, 24 V high System malfunction Alarm = high Ground fault alarm Alarm = low Auxiliary system Alarm = low Input current for detection 1 mA min., 40 mA maximum @ 70 °C Input type Optically isolated current input Voltage 120 VAC/240 VAC 50/60 Hz Watts 50 W maximum Ground Fault Detection Signal Output Auxiliary input Power requirements ! Benefits RL Rotor Accumetrics offers these advantages over conventional technology: n n n n n Ground Fault Generator Field Exciter Wireless data transmission Unaffected by noise, dirt, or contamination Self-checking device for data accuracy Proven design Auxiliary motor input + - VBIAS A 3-12 V Ground Fault Detector ACCUMETRICS About Accumetrics: A PCB GROUP COMPANY 6 British American Boulevard Suite 103-F, Latham, NY 12110 Phone 518-393-2200 Fax 716-684-0987 n Email [email protected] Website www.accumetrix.com Founded in 1991, and a part of PCB Group (2013), Accumetrics is a world leader in rotor telemetry, pioneering in every phase of rotor telemetry, from quickly applied single channel dependable torque systems to advanced aerospace systems with hundreds of high bandwidth channels. No matter your industry or what your telemetry requirement, chances are we can provide a system that will meet your needs. © 2014 PCB Group, Inc. In the interest of constant product improvement, specifications are subject to change without notice. PCB, ECHO, ICP, Modally Tuned, Spindler, Swiveler and TORKDISC are registered trademarks of PCB Group. SoundTrack LXT, Spark and Blaze are registered trademarks of PCB Piezotronics. SensorLine is a service mark of PCB Group. All other trademarks are property of their respective owners. visit us online at www.accumetrix.com Accumetrics-AT6000-0715 Printed in U.S.A. !