ABB KD-1 Instruction Leaflet

ABB KD-1 Instruction Leaflet Manual pdf 1 page image

Effective: April 1981NEW INFORMATIONABE Power T&D Company Inc.Relay DivisionCoral Springs, FL 33065Instruction LeafletI.L. 41-498.5Type KD CompensatorDistance Relays Calibrationand Maintenance ProceduresThese instructions are intended to supplementInstruction Leaflets 41-491, 41-498.11, 41-491.4,41-498.12 and 41-490, covering the KD-1, 4, 41,5, 10, and 11 line of compensator distance relays,respectively. These instructions expand on the in-formation given in these I.L.'s and suggest whatelements should be included in a calibration andmaintenance program.A calibration and maintenance programshould involve two steps: 1) a receiving accept-ance check and 2) a routine (periodic) mainten-ance program. These two steps are outlined below:RECEIVING ACCEPTANCEReceived relays should be subjected to thechecks outlined in the applicable I.L. These checkswill insure that there is no shipping damage andthat the relay has been received in the same cali-brated condition as it left the factory. They willinsure that set-up procedures such as removingcontact blocking has been accomplished. A re-ceiving acceptance check should include thefollowing steps:1. Perform all of the mechanical and electricaltests listed in the receiving acceptance sectionof the applicable I.L., include the maximumtorque angle test, even if it is not called forin some I.L.‘s.2. Follow the appropriate test procedures outlined inI.L.‘s covering the K-DAR FIELD TEST UNIT.It is suggested that all dial test readings in each testbe recorded for future reference. This information3.will be very helpful in recognizing possible drift ofelectrical characteristics.If the settings to be applied to the relay when it isinstalled are known, the relay should be set tothese settings and checked with the field test unitsas noted in step 2 above. A record for future refer-ence should be taken. The relay test values usingthe KDAR test unit should check to be within 2 7percent of the relay settings.ROUTINE MAINTENANCEThe relay should be checked periodically attime intervals dictated by previous experienceand practices. Westinghouse recommends thatthe time interval between checks be a maximumof two years. Routine maintenance should includeat1.2.3.leas; the following steps:Repeat step 2 or 3 under Receiving Acceptanceand record test results.Compare test results with previous results. Ifany test values deviate from previous checksby more than &5 percent, recheck relay per-formance in line with the receiving acceptancechecks outlined above step 1.Retain records of test results on each particularrelay. During each routine maintenance, therecords should be analyzed to determine ifthere is any evidence of drift; i.e., continuedchange in characteristic in the same direction.Evidence of drift should be traced to the parti-cular element involved, usually a capacitor orresistor and this element replaced.All possible contingencies which may arise during installation, operation or maintenance, and all detailsand variations of this equipment do not purport to be covered by these instructions. ff further informationis 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

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