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GEK-45404 DESCRIPTION ................................................................................................................................................... 3 APPLICATION................................................................................................................................................... 4 RATINGS............................................................................................................................................................ 5 BURDENS ....
GEK-45404 DESCRIPTION These are single-phase, sensitive overvoltage relays of the induction disk construction. They are equipped with a time dial so as to provide adjustable time delay in their operation. The relays are principally applicable for sensitive overvoltage ground detection for high-impedance grounded generators or for ungrounded power systems. The differences among the four relays are as indicated in Table A below.
GEK-45404 APPLICATION These are single-phase, sensitive, time-delay overvoltage relays. They are principally applicable for sensitive overvoltage ground detection for high-impedance grounded generators or for ungrounded power systems. These relays all have a capacitor in series with the operating coil. For the IAV51K and IAV52K relays, this capacitor is external to the relay because of its large size.
GEK-45404 broken delta voltage will therefore be three times the normal delta phase-to-phase voltage with no fault. RATINGS The operating-circuit ratings available are shown in Table I. The operating coil will stand rated voltage continuously on any tap. RELAY IAV51D IAV51K IAV52C IAV52D IAV52K VOLTAGE RATINGS 60HZ 115 199 345 67 115 199 345 199 67 50HZ 115 199 345 67 115 199 345 67 The current-closing rating of the contacts is 30 amperes for voltage not exceeding 250 volts.
GEK-45404 such that the tripping current does not pass through the contacts of the target and seal-in coil of the protective relay. BURDENS Burdens for the various relay types are give in Tables IIIA and B. TABLE IIIA RELAY TYPES 1AV51D VOLTAGE RATING 115 IAV51D IAV52D 199 IAV51D 345 IAV51K IAV52K 67 1AV51D 115 199 345 115 IAV51D 199 IAV52C 60 - Cycle Burdens Rated Voltage TAP**SETTING VOLT-AMPS A(10) B(15) C(25) D(40) A(16) B(24) C(40) D(64) A(28) B(42) C(70) D(112) A(5.4) B(7.5) C(12.
GEK-45404 RELAY TYPES IAV51D VOLTAGE RATING 345 IAV51K IAV52K 67 50 - Cycle Burdens at Rated Voltages TAP**SETTING VOLT-AMPS 115 199 345 IAV52C A(28) B(42) C(70) D(112) A(5.4) B(7.5) C(12.5) D(20) No Taps No Taps No Taps 31.9 28.3 21.0 12.8 28.8 26.6 21.1 16.0 25.0 25.4 31.9 POWER FACTOR 0.36 0.56 0.79 0.93 0.29 0.45 0.71 0.86 0.41 0.28 0.36 WATTS 11.4 15.8 16.6 11.9 8.4 12.1 14.9 13.7 10.1 7.0 11.
GEK-45404 RELAY TYPES 1AV51D VOLTAGE RATINGS 115 IAV51D 199 IAV51D 345 IAV51K IAV52K 67 IAV52C 115 199 345 50 - Cycle Burden at Rated Voltages TAP**SETTINGS VOLT-AMPS POWER FACTOR A(10) 0.52 0.98 B(15) 0.67 0.99 C(25) 1.0 1.0 D(40) 1.52 1.0 A(16) 0.32 0.85 B(24) 0.5 0.93 C(40) 0.83 0.97 D(64) 1.33 0.99 A(28) 0.39 0.96 B(42) 0.58 0.98 C(70) 0.96 0.99 D(112) 1.35 1.0 A(5.4) 0.38 0.91 B(7.5) 0.52 0.95 C(12.5) 0.87 0.98 D(20) 1.42 0.99 No Taps 0.27 0.98 No Taps 0.32 0.85 No Taps 0.39 0.96 WATTS 0.
GEK-45404 The IAV52K relay is similar to the IAV51K except that it has two, instead of one, normally-open contacts. The IAV52C is a low-pickup, time-overvoltage relay with two normally-open contacts. It has a sealin element. It has a capacitor connected in series with the operating coil but, unlike the IAV51D relay, it does not have a tapped resistor connected in series with the operating coil.
GEK-45404 RECEIVING, HANDLING, AND STORAGE RECEIVING These relays, when not shipped as a part of a control panel, will be shipped in cartons designed to protect them against damage. Immediately upon receipt of the relay, an examination should be made for any damage sustained during shipment. If injury or damage resulting from rough handling is evident, a damage claim should be filed at once with the transportation company and the nearest General Electric Sales Office should be notified promptly.
GEK-45404 CAUTION: Every circuit in the drawout case has an auxiliary brush. It is especially important on current circuits and other circuits with shorting bars that the auxiliary brush be bent high enough to engage the connecting plug or test plug before the main brushes do. This will prevent Current Transformer (CT) secondary circuits from being opened. MECHANICAL INSPECTION On relays that have time dials, the dials will be set at zero before the relay leaves the factory.
GEK-45404 ELECTRICAL TESTS Drawout Relays - General Since all drawout relays in service operate in their cases, it is recommended that they be tested in their cases or an equivalent steel case. In this way any magnetic effects of the enclosure will be accurately duplicated during testing. A relay may be tested without removing it from the panel by using a 12XLA13A test plug. This plug makes connections only with the relay and does not disturb any shorting bars in the case.
GEK-45404 INSTALLATION INSPECTION At the time of installation, the relay should be inspected for tarnished contacts, loose screws, or other imperfections. If any trouble is found, it should be corrected; see MAINTENANCE. Check the nameplate for model number and rating. LOCATION The location should be clean and dry, free from dust and excessive vibration, and well lighted to facilitate inspection and testing. MOUNTING The relay should be mounted on a vertical surface.
GEK-45404 ADJUSTMENTS Target and Seal-in Unit For trip coils operating on current ranging from 0.2 up to 2.0 amperes at the minimum control voltage, set the target and seal-in tap plug in the 0.2- ampere tap. For trip coils operating on currents ranging from 2 to 30 amperes at the minimum control voltage, place the tap plug in the 2.0-ampere tap. The tap plug is the screw holding the right-hand stationary contact of the seal-in element. To change the tap setting, first remove the connecting plug.
GEK-45404 Time Setting The time of operation of the overvoltage relay is determined primarily by the setting of the time dial. Further adjustment is obtained by moving the permanent magnet along its supporting shelf; moving the magnet in toward the back of the relay decreases the time, while moving it out increases the time. Fig. 11 shows the time-voltage characteristics of the IAV51D, IAV52D, IAV51K and IAV52K for the four tap settings for the Number 1, 5, and 10 time- dial positions.
GEK-45404 CONTACT CLEANING For cleaning fine silver contacts, a flexible burnishing tool should be used. This consists of a flexible strip of metal with an etched roughened surface, resembling in effect a superfine file. The polishing action is so delicate that no scratches are left, yet corroded material will be removed rapidly and thoroughly. The flexibility of the tool ensures the cleaning of the actual points of contact.
GEK-45404 LIST OF FIGURES FIG. 1 (8043181) TYPE IAV51D RELAY, REMOVED FROM CASE, FRONT VIEW FIG. 2 (8043182) TYPE IAV51D RELAY, REMOVED FROM CASE, REAR VIEW FIG. 3 (K6400439-5) FRONT VIEW INTERNAL CONNECTIONS OF THE TYPE FIG. 4 (0362A514-3) FRONT VIEW INTERNAL CONNECTIONS OF THE TYPE IAV51K RELAY, FIG. 5 (K6556505-0) FRONT VIEW INTERNAL CONNECTIONS OF THE TYPE FIG. 6 (0418A790-0) FRONT VIEW INTERNAL CONNECTIONS OF THE TYPE IAV52D RELAY, FIG.
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