ABB ARS Series Manuals

ABB Automation, Inc. Substation Automation and Protection Division Coral Springs, FL 33065 Instruction Leaflet All possible contingencies which may arise during installation, operation or maintenance, and all details and variations of this equipment do not purport to be covered by these instructions. If further information is desired by purchaser regarding this particular installation, operation or maintenance of this equipment, the local ABB Power T&D Company Inc. representative should be contacted. Printed in U.S.A. 41-759.2D Effective: May 1999 Supersedes I.L. 41-759.2C, dated June 1985 ( ) Denotes Change Since Previous Issue Type ARS Auxiliary Relay High Speed CAUTION ! Before putting protective relays into service, remove all blocking which may have been inserted for the purpose of securing the parts during shipment. Make sure that all moving parts operate freely. Inspect the contacts to see that they are clean and can close properly. Operate the relay to check the settings and electrical con- nections. 1.0 APPLICATION The ARS relay is a high speed auxiliary that has a 20 volt low energy level input and a multiple contact out- put. It may be used as a tripping auxiliary for relays such as the SP and SDG-1 or as an oscillograph interface. The driving device must be capable of providing an input to the ARS of 6 milliamperes at a level of 15 to 20 volts. 2.0 CONSTRUCTION AND OPERATION The type ARS relay is composed of 1 or 2 AR units with series resistors, a printed circuit module, and indicating contactor switches (ICS) when required, mounted in a FT-11 or FT-22 case, depending upon style. AR Unit The relay consists of four stationary contact screws, four leaf spring moving contacts, a moving armature and card assembly, which operates the moving con- tacts; a U shaped laminated core, a coil, a frame, a molded insulation block and a series resistor. The armature and card assembly slip over a hinge pin which is inserted in the laminations. The moving and stationary contacts are mounted on the molded insulation block. The molded block and coil and lami- nation assembly are mounted to the frame. All con- tacts are fine silver. When the coil and resistor are energized, the arma- ture is attracted to the laminations. The card moves with the armature thereby operating the moving con- tacts. The tension of the moving contacts is the reset- ting force. High speed operation is obtained by the low inertia of the moving parts, a sensitive electromagnet, and the proper L/R ratio of the operating circuit. Printed Circuit Module The printed circuit module contains the proper num- ber of transistors, protective zener diodes, capacitors, resistors, and diodes for the buffered amplifier cir- cuitry controlling each AR unit. With the rated supply voltage to the relay, the proper signal voltage applied to an input terminal will cause the related AR unit to pickup. The AR unit will then energize the ICS (if used), which will seal around the AR unit contacts. The removal of the input voltage will cause the AR unit to drop out. Indicating Contactor Switch Unit (ICS) The dc indicating contactor switch is a small clapper