INSTANTANEOUS UNDERVOLTAGE RELAY

Transcription

1 PHILADELPHIA, PA. GENERALS ELECTRIC POWER SYSTEMS MANAGEMENT DEPARTMENT PJV17A UNDERVOLTAGE RELAY INSTANTANEOUS GEI INSTRUCTIONS SUPR5EDES GEI-23986

2 2 MOVING CONTACT CONTACT STATIONARY COIL Fig. 2 ( ) Two Stick Cage Resistor Typical of the External Resistor Used with PJYI7A Relays -4 Fig. I ( ) PJVI7A Reley with Cover emd Hameplate Removed 0 0 C, a, AR MATURE ADJUSTABLE 1 OPERATIN Ci FRAME MAGNET GEI liistant.aneous Voltage Relay Type PJV TUBE CALI5RATION a > a C

3 INSTANTANEOUS UNDERVOLTAGE RELAY TYPE PJVII7A DESCRIPTI ON The PJV17A relay is an instantaneous d-c undervoltage relay with extra high dropout designed specifically to be used to monitor the d-c charging supply for a station battery and to sound an alarm if this supply falls. The relay is equipped with both an a-c and d-c coil with external resistors for each. Also the relay has one normally open and one normally closed contact but no target. It is packaged in a surface mounted, back connected molded case, and is normally used In conjunction with one time delay drop-out auxiliary relay. IARULAF ION OF EXTERNAL RESISTOR VAWES REQO FOR F J dll* UCCIRCItIT AC circjjit noel VOLTS - ANT MI WII l2pv PJVI PJy17A3 I2PJV17A4 12PJV1708 z --ï - -- o/5 or I APPLICATION Because the PJV17A drops out at 95, ot pickup voltage or more, it finds appitca tion wherever a high-speed, extra high dropout, d-c relay is required. It should be noted that although the PJV17A relay is applied to detect undervoltage, the relay requires an a-c supply in addition to the d-r voltage being measured. Usually the PJV17A relay s used to detect station battery undervoltage and to provide an alarm. Since some operating conditions may temporarily lower the d-c voltage, it is suggested that the PJV17A be used In conjunction with a time delay dropout auxiliary relay to prevent false alarms. 12 PJ Vi? Al? : /to / /60 50/60 I2PJV17A19 I2PJVI? / I2PJVI7A21 soio / PJ V 17* JV17p PJV17A SJV17A G PJV17A / PJV17A S S2PJV17A / iaju?suu 1200 Fig. 3 shows the PJVI7A used in con junction with a time delay dropout HGAB5D relay which provider a time delay of about two seconds and at the same time monttors the a-c supply to the battery charger. This arrangement wiil sound an alarm not only when a prolonged d-c undervoltage occurs but also when the a-c power is lost without waiting for the battery voltage to decay. When the PJV17A relay is used to monitor either a lead-acid or a nickelcadmium battery, it is suggested that the dropout be set about 98% of the fully charged open circuit voltage of the battery. For example, the fully charged open circuit voltage of a 80 cell lead-acid battery will be 123 volts and the suggested PJVIIA setting about 121 volts. Also the relay must pick up at the lowest acceptable battery charger output. RATINGS TAILE A Table A gives detailed Information on the PJV17A relay coil ratings and the ex ternal resistors which are used with these coils. The external resistors are supplied as a part of the relay and each relay is calibrated with Its resistors. Table B gives the relay contact inter rupting ratings. These contacts will make and carry five amperes continuously or 30 amperes for two seconds. INTERRUPTING RATINGS TABLE B A-C VOLTS AMPS INDUCTIVE NON-INDtJCTWE D-C VOLTS I Thea. kissructoni do not pwport to cover all detail, or variation, rn equipment nor to provid, fo, every possible I contingency to be met In connection with a#ation, operation or maintenance. Should further information be deair.d or should particular problems aria, which are not covered sufficiently for the purchaser s purpoa.., the maher should referred to hi General Electric Company. L6

4 4 in the side of the calibrating tube allow in unpacking the relay. H the relays are except they are mounted below the moving contact and the backstop arm Is omitted. from rough handing is evident, file a dam General Electric Apparatus Sales Office. Reasonable care should be exercised tive dropout point. upward as the armature is drawn upward when the relay is picked up. The action of a sizeable air gap In the magnetic circuit from limiting the armature travel to retain solenoid. The high dropout feature results rod which carries the moving contacts brating tube. This adjustable armature is erated direduy by the plunger (armature) CONSTRUCTION are given in Table A. BURDEN ture on its threaded haf I. The relay will changing the vertical position of the arma drop out at 95% or more of the pickup volt by an amrature drawn up vertically into a tion. The contacts are opened and closed the a c coil also helps to establigh a posi age at any setting. winding is approximately 4OVA. which operates by electromagnetic attrac The PJV17A Is a plunger-type relay The volt-ampere burden of the a-c mounted on the threaded portion of a plunger The stationary contacts, magnet frame The normally closed fixed contacts are company and promptly notify the nearest age claim at once with the transportation in transit. If Injury or damage resulting relay, examine it for any damage sustained damage. Immediately upon receipt of a relay by means of two thumb screws. See cartons designed to protect them against part of a control panel, will be shipped in These relays, when not included as AND STORAGE RECEIVING HANDLING access to the armature to permit adjust similar to the normally open fixed contacts A projecti in of the molded base paral brattng tube. rotation of the moving contacts. Openings pole piece and at the bottom by the fit of lel to the moving contact support prevents ment. rod are provided at the top by a hole in the the molded cntacl carrier inside the cali Fig. 5 for dimensions and panel drilling. the operating coils. Guides for the plunger CHARACTERISTICS GEI Instantaneous Voltage Relay Type PJV OPERATING PRINCWLES The PJV11A relay can be adjusted by The resistances of the d-c winciings The PJV17A relay contacts are op which moves vertically inside the cali into the solenoid by the flux established by and coil, are mounted on a compound base. The cover is attached to the front of the Immediately upon receipt of the relay mately 98% of rated DC voltage. The pickup dropout voltage. cheek by visual inspection that there are 1/64 inch. The normally open contact gap 1/32 inch. A backstop should be present between the backstop and contact brush at cage and in a level position. value should be no more than 106% of the electrical checks be made immediately tests should be made with the relay in Its creased until the contacts reset atapproxi test voltage should then be gradually de contacts with one continuous motion. The the tip should be approximately 1/16 inch mally supplied from the factory with the age applied to the DC coil (studs 1-2) In should pick up, closing its normally open series with the DC resistor. The relay resistor. Gradually increase DC test volt AC cotl (studs 5-6) in series with the AC MECHANICAL INSPECTION to a dropout of 98% of rated voltage. It on the calibration tube which corresponds 1. Pickup and Reset - The units are nor upon receipt of the relay. Note that all 1. Operate the plunger by hand and allow It is recommended that the following tion rang of the relay received agree with VISUAL INSPECTION calibrations have not been disturbed. screws are tight. Also check to see that made to insure that no damage has been Check the nameplate stamping to insure it to reset to Insure that all parts are free above the normally open contact. The gap an inspection and acceptance test should be ACCEPTANCE TESTS inside when the cover is removedand cause trouble in the operation of the relay. that the model number, rating and calibra signs of physical damage, and that all formed. mechanical adjustments be checked: closed contact should be approximately on the outside of the case may find its way no broken or cracked molded parts or other 2. The wipe on a normally open or normally metallic chips. Foreign matter collecten sustained in shipment and that the relay from friction or binds. this setting. Apply rated AC voltage to the a place that is free from moisture, duet and should be atored in their original cartons In the requlsition. Remove the relay from its case and the flexible moving contact leads extending back from the contacts have not been de ELECTRICAL TESTS It is recommended that the following bottom of the armature aligned with a mark should be sufficient to check the dropout at not to be installed Immediately, they with the armature fully reset should be with the armature reset. relays in the operation of a power system silver contacts should be cleaned with a surface. Burnishing tools designed per volt should be used for making the test. If it is necessary to makeadjustments cessive friction is present, check to see If there is any tendency to bind or If ex 1. Frtction charger output voltage with normal a-c terval between periodic checks will vary storing them. Manually operate the armature and allow it to reset to make sure that there is Check the contact gap and wipe and the backstop position; values should agree the battery charger at its lowest charging should be 106% or less of the dropout volt following points should be observed in re no excessive friction or tendency to bind. one to two years: MECHANICAL CHECKS PERIODIC CHECKS AND voltage on the outer operating coil. points be checked at an interval of from be followed. It is recognized that the in enough experience to select the test inter testing. Until the user has accumulated and- the user s experience with periodic to obtain the desired dropout. After the armature should be adjusted, If necessary, dropout value to be used and it should be location and preheated. The position of the dropout is set, check that the relay will ments it is suggested that the following Also the relay should be set at the checked. When making this check, the pick up at the lowest acceptable battery depending upon environment, type of relay, pickup and dropout. The pickup voltage rate and vary the test resistor to check the knives, files or abrasive paper or cloth of check the relay pickup and dropout. Set any kind to clean relay contacts. be obtained from the factory. Do not use especially for cleaning relay contacts can strip of metal, with an etched, roughened burnishing tool, which consists of a flexible of tarnishing or corrosion. These fine with those given in the section under AC is recommended that the visual and me chanical inspection described in the sec before Installation. it is important that a periodic testprogram val best suited to his individual require Examine the contact surfaces for signs storage before shipment to the job site, it relay should be installed in its permanent sections are found to be out of limits, the check points described in the previous SERVICING refer to the section on SERVICING. age. A voltmeter with at least 1000 ohms CEPTANCE TESTS, the relay is held in tion on ACCEPTANCE TESTS be repeated CEPTANCE TESTS. Using connections as indicated in Fig. 4 If after the performance of the AC In view of the vital roll of protective If any of the mechanical or electrical INSTALLATION PROCEDURE ROUTINE MAINTENANCE

5 5 b. There should be a 900 bend In the lead of the lead. damaged and probably the damage would be more than one turn over the complete length brating tube and that no foreign matter is reformed as follows: tact guide move freely inside the cali move it away from the base. Also check to ti.ibe would have to be straightened and/or deformation f the calibrating tube. This see that the armature and the molded con contact have been damaged, they ehodd be If the flexible leads from the moving tube. present between them and the ealibratine would indicate that the relay has been compound relay base. Inadequate clearance a shim placed behind the magnet frame to adequate (0.010 Inch) clearance from the that the moving contact molded support has a. The flexible leads should be twimed no at the terminal screw. which the relay was furnished. the General Electric requisition number on terminals to which they are connected.,hould touch no part of the relay except the p lete travel of the contacts; that is, they cj The leais should be free over the corn Instantaneous Voltage Relay Type PJV GEI complete nameplate data. If possible, give the relay calibration. gauge. horizontal. quired, name of the part wanted, and give Electric Company, specify quantity re c. Both normally open and normally closed the contact tip is attached should be nearly the nearest Sales Office of the General When ordering renewal parts, address section of the fixed contact brush to which that are worn, broken, or damaged. to enable the prompt replacement of any tities of renewal parts be carried in stock It is recomnended that sufficient quan RENEWAL PARTS e. After adjustments are complete the contacts should have a 1/64 Inch wipe. barely open. between the upper stationary and movable b. There should be about a t/32 gap 15 grams as measuredwitha standard gram adjusted to have an initial tension of about contacts when the lower contact is just a. Each stationary contact brush should be proceed as follows: - U it is necessary to replace a contact correctly formed, they may seriously affect Note that if the flexible leads are not assembly towards the base. d. ihe leads should not pull the contact

6 GEI Inatantaneoue Voltage Relay Type PJV BATTERY CHARGER I. STAT I ON SERVICE SUPPLY A.C. IN PUT TO BATTERY ( ) 27 EXT. RES. 27 AC INPUT OUTPUT ( ) D.C. (4.) RECTIFTER SUPPLIED WITH DEVICE ilj ±27x±27xJ27X ± X 21 I 6J 81 wt ALARM CONTACTS ARE REVERSIBLE IN FIELD FOR EITHER NORMALLY OPEN OR NORMALLY CLOSED OPERATION if TIME DELAY DROP OUT 27 LEGEND PJV17A HFA65D Fig. 3 (0148A ) External Connectioiis For The PJVI7A Relay U5ed Wth The KFA6SD Relay For Low Rattery Voltage Indication

7 7 Fig. 4 (0165A6010 O) Teat Connection tliagrm For The PJYI7A Relay 27 RtLAY UAGE FOR TEST. OAT1N CIRCWT TO VARY V(MLL TEST ESfSTOR INSERTED BATTERY TO Instantaneous Voltage Relay Type PJV GEI-83951

8 GEI-83g51 Inetantaneous Voltage Relay Type PJV ) T CODE 11 CONTACT CODE (FRONT VIEW) TOP OUTL I NE OF_RELAY 5 SPACE REQ D TO REMOVE COVER TYPE OF PANES.. A B C INSULATING 7 I 3 2 T fl. 11 STEEL (8 HOLES) INNER COIL DC) * 1 50-*--o OUTER COIL (AC) * NOrE 6 EXT. SERIES R REQ D. FOR EACH COl L..SEE 3HEET 2 DIA. ( HOLES) PANEL DRILLING (FRONT VIEW) INTERNAL CONNECTIONS (BACK VIEW) Fig. 5 ( ) Outline Pajiel Drilling Arid internal Connections For The P.JY17A Relay GENERAL ELECTRIC COMPANY, PHILADELPHIA, PA.