INSTRUCTIONS GEI-98305C UNDERVOLTAGE RELAY D-C. Type NGV18A GENERAL ELECTRIC

Transcription

1 INSTRUCTIONS GEI-98305C D-C UNDERVOLTAGE RELAY Type NGV18A GENERAL ELECTRIC

2 2 Fig ( ) NOV18A Relay Removed From Case (Rear View) GEI D-C Undervoltage Relay Type NOV Fig. 1 ( ) NGVI&L e1ey Removed From Case (Front Viev) RI

3 specifically to be used to monitor the d-c charging undervoltage relay with extra high dropout designed The NGV18A relay is an instantaneous d-c DESCRIPTION The resistors are supplied as a and each relay is calibrated with TABLE A listed on Fig. 3. its resistors. part of the relay 3 but no such assurance is given with respect to local codes and ordinances because they vary greatly. RATINGS NGV18A relay coil ratings and the resistors are delay dropout HFA65D relay which provides a time Figure 5 shows the NGV18A used with a time This arrangement will sound an alarm not only when a prolonged d-c undervoltage occurs but also when delay of about two seconds and at the same time voltage to decay. fully charged open circuit voltage of the battery. Table A gives detailed information on the either a lead-acid or a nickel-cadmium battery, it is suggested that the dropout be set about 98% of the For example, the fully charged open circuit voltage battery charger output. the relay must pickup at the lowest acceptable the a-c power is lost without waiting for the battery the suggested NGV18A setting about 121 volts. Also of a 60 cell lead-acid battery will be 123 volts and When the NGV18A relay is used to monitor monitors the a-c supply to the battery charger. * The inductive rating is based on the indictive of an To the extent required the products described herein meet applicable ANSI, IEEE and NEMA standards; the purchasers purposes, the matter should be referred to the General Slectric Company. further information be desired or should particular problems arise which are not covered sufficiently for every possible contingency to be met in connection with installation, operation or maintenance. Should These instructions do not purport to cover all details or variations in equipment nor to provide for BURDEN in Table A. OPERATING PRINCIPLES The NGV18A is a hinged armature type relay which operates by electromagnetic attraction. The The NGV1SA relay pick up can be adjusted by The resistances of the d-c windings are given means of the variable resistor Ri. The relay will droput feature results from the characteristic of pick up at 105% or less of dropout voltage. the zener diode regulator. average tripping coil. contacts are opened and closed by the movement spring and operated by the D.C. solenoid. The high of an armature which is restrained by an opening CHARACTERISTICS delay auxiliary relay to prevent false alarms. alarm. Since some operating conditions may temporarily lower the d-c voltage, It is suggested station battery undervoltage and to provide an Usually the NGV18A relay is used to detect Because the NGV18A picks up at 105% of drop high-speed, extra high dropout, d-c relay Is re quired. that the NGV18A be used in conjunction with a time A-C VOLTS D-C VOLTS AMPS INDUCTWE* NON-INDUCTIVE APPLICATION out voltage or less, It finds application wherever a TABLE B INTERRUPTING RATINGS target. It is packaged in a S-i drawout case, for mally open and one normally closed contact but no In series with the operating coil and the fixed and telephone-type voltage unit with a zener regulator The relay undervoltage element consists of a this supply falls. either flush or surface mounting. It is normally auxiliary relay. adjustable resistors. Also the relay has one nor used in conjunction with one time delay dropout seconds. ratings. These contacts will make and carry three amperes continuously or 30 amperes for two Table B gives the relay contact interrupting NGV18A NGVL8A I 125 NGV18A OHMS RELAY MODEL RESISTANCE VOLTAGE D.C. COIL D.C. supply for a station battery to sound an alarm if TYPE NGV18A D.C UNDERVOLTAGE RELAY

4 4 by a test plug. The cover, which is attached to the Relay Type NGV18A (Front View) * 0 connected by removing the connection plug which when desired. To do this, the relay Is first die assembly which is latched into a drawout case whes completes the electrical connections between the case block and the cradle block. To test the relay front bf the relay case, contains an interlock arm 0 lock circuits. CONSTRUCTION in its case this connection block can be replaced GEI D-C Undervoltage Type NGV18A The relay components are mounted in a cradle the relay is in operation but It can be easily removed ment. These relays, when not included as part of a from rough handling is evident, file a damage claim control panel, will be shipped in cartons designed promptly notify the nearest General Electric Apparatus Sales Office. at once with the transportation company and tained in transit. If injury or damage resulting receipt of a relay, examine it for any damage sus to protect them against damage. Immediately upon RECEIVING, HANDLING AND STORAGE 5+ I2NGV1HA1 OOO 12GVThA2 OOO v -!O6T EICEP Fig. 3 (D165A7720-3) Internal Connections, (C pressure to prevent the opening of important inter makes contact as Indicated in FIg. 4 with adequate it is especially Important that the auxiliary brush with shorting bars (see Fig. 3). On these circuits, adequate overlap when the connecting plug is with drawn or inserted. Some circuits are equipped auxiliary brush, as shown in Fig. 4, to provide Fig. 6. Every circuit In the drawout case has an included. For outilne and drilling dimensions, see relay order to insure that proper hardware will be However, panel thickness must be indicated on the The relay case Is suitable for either semiflush or surface mounting on all panels up to 2 inches thick and appropriate hardware is available. which prevents the cover from being replaced until the connection plugs have been inserted. indicates revision TESTS, the relay is held In storage before shipment to the job site, it is recommended that the visual If alter the performance of the ACCEPTANCE INSTALLATION PROCEDURE before the residual screw strikes the shim. With closed contacts should be.ol0 to.020. The wipe on each normally open contact should and the pole piece and operating the armature by the armature picked up, the gap on jhe normally hand. The normally open contacts should make inserting a shtm between the residual screw be approxiniit*iv.005. This can be checked by mately.005. contact by deflecting the station contact member towards the frame. Wipe should be approxi Observe the wipe on each normally closed contact should have a gap of.015 or more. 2. WIth the relay de-energized each nqrmally open parts are free from friction or binds. hand and allow it to reset to insure that all 1. Operate the armature of the voltage unit by adjustments be checked; It is recommended that thefollowingmechanical * MECHANICAL INSPECTION damage, and that all screws are tight. visual inspection that there are no broken or cracked molded parts or other signs of physical Remove the relay from its case and check by the relay received agree with the requisition. Check the nameplate stamping to insure that the model number, rating and calibration range of VISUAL INSPECTION Insure that no damage has been sustained in ship Immediately upon receipt of the relay an in spection and acceptance test should be made to ACCEPTANCE TESTS of the relay. cover is removed and cause trouble in the operation outside of the case may find its way Inside when the cartons in a place that is free from moisture, dust ing the relay. If the relays are not to be Installed and metallic chips. Foreign matter collected on the Reasonable care should be exercised in unpack immediately, they should be stored in their original

5 Also the relay should be set at the dropout the lowest acceptable battery charger outputvoltage. The ratio of pickup to dropout can be changed by value to be used and it should be checked. When droput is set, check that the relay will pick up at in its permanent location and preheated. After the making this check, the relay should be installed stallation. setting of the variable resistor Ri, (see Fig. 3.) on ACCEPTANCE TESTS be repeated before in and mechanical inspection described in the section D-C Undervoltage Relay Type NGV GEI The pickup voltage is adjusted by changing the observed in restoring them. to be out of limits, the following points should be points described in the previous sections are found If any of the mechanical or electrical check SERVICING. sary to make adjustments, refer to the section on age. A voltmeter with at least 1000 ohms per volt should be used for making the test. If it Is neces voltage should be 106% or less of the dropout volt rate and check the pickup and dropout. The pickup Set the battery charger at Its lowest charging tarnishing or corrosion. Examine the contact surfaces for signs of Check that the contact gap andwtpe values agree with those given in the ectien under ACCEPTANCE TESTS. or tendency to bind. reset to make sure thatthere is no excessive friction Manually operate the armature and allow it to MECHANICAL CIECKS Showing P sition of Auxiliary Brush and Shorting Bar Fig. 4 ( ) Cross Section of Drawout Case THE TERMINAL BLOCK TRAVELS /4 INCH BEFORE ENGAGING THE MAIN BRUSH ON NOTE. AFTER ENRAGING AUXILIARY BRUSH CONNECTING PLUG SHORTING BAR AUXILIARY BRUSHJ TERMILL BLOCK select the test interval best suited to his individual requirements, it is suggested that the following will vary depending upon environment, type of relay recognized that the interval between periodic checks that a periodic test program be followed, It Is points be checked at an Interval of from one to two years. the operation of a power system it is important and the user s experience with periodic testing. Until the user has accumulated enough experience to In view of the vital role of protective relays In MAINTENANCE PERIODIC CHECKS AND ROUTINE 5 for Type NGV18A Relay with Type HFA65D for Low Battery Indicator Fig. 5 (01781o9003 (2])Exrernal Connection Diagrwn Th eoooo 111 NO 27 NG11 wr,.e. -c : F 10 Cl 0-4) OFC0700N. IOU)FC FOR R Olf fir N4F+A.LLY N0 A1._Y 01OL7i d IN 1 C oo roost: 104 f 1L1 t1l 1Z 11L j Ill 147V number on which the relay was furnished. possible, give the General Electric requisition wanted, and give complete nameplate data. If pany, specify quantity required, name of the part nearest Sales Office of the General Electric Com When ordering renewal parts, address the damaged. prompt replacement of any that are worn, broken or renewal parts be carried in stock to enable the It is recommended that sufficient quantities of RENEWAL PARTS tool as described above can be obtained from the paper or cloth to clean relay contacts. A burnishing superfine file which removes corroded material bility of the tool insures the cleaning of the actual roughened strip of flexible metal, resembling a quickly without scratching the surface. The flexi ing tool should be used. This consists of an etched For cleaning relay contacts, a flexible burnish points of contact. Never use knives, files, abrasive factory. voltage unit. The minimum gap must be inch between armature and pole face. turning the residual screw of the telephone-type SERVICING

6 tnches 5/16 18 STUD CASE L 168MM PANEL DRILLING (TYPICAL).500 CU ThU T PANEL LOCATION SEMI FLUSH SURFACE PANEL DRILLING MM ;--- SURFACE MTG. CUTOUT MAY REPLACE 1 09MM.1,156 (2) 5/16 18 STUDS 6. * Indicates revision LYICAL DIM. 232MM 4 HOLES 6MM GLASS 29MM BACK VIEW 144MM FUR SEMI-FLUSH MOUNTING FRONT VIEW 12MM FOR SURFACE MOUNTING FRONT VIEW * Fig. 6 ( [8]) Outline and Panel Drilling Dimensions for Type NGV18A Relay 10 HOLES P3/4 DRILL DRiLLED HOLES 1/4 DRILL STUD NUMBER ING 29MM 37MM MM 5MM PANEL 19MM MM VIEW FOR GEI DC Undervoltage Re ay Type NGV

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