INSTRUCTIONS GENERAL ELECTRIC GEK-34054H TIME OVERCURRENT RELAYS TYPES IAC53A FORM 800 AND UP IAC53B FORM 800 AND UP IAC54A FORM 800 AND UP

Transcription

1 INSTRUCTIONS H GENERAL ELECTRIC IAC53B FORM 800 AND UP IAC54B FORM 800 AND UP IAC53A FORM 800 AND UP IAC54A FORM 800 AND UP TYPES TIME OVERCURRENT RELAYS

2 TABLE OF CONTENTS PAGE DESCRIPTION APPLICATION CONSTRUCTION RATINGS TIME-OVERCURRENT UNIT INSTANTANEOUS UNIT TARGET AND SEAL-IN UNIT CONTACTS BURDENS CHARACTERISTICS RECEIVING, HANDLING, AND STORAGE ACCEPTANCE TESTS VISUAL INSPECTION MECHANICAL INSPECTION ELECTRICAL TESTS DRAWOUT RELAYS, GENERAL POWER REQUIREMENTS, GENERAL TIME-OVERCURRENT UNIT. Time Setting Pickup Test Time Test INSTANTANEOUS UNIT Setting the Instantaneous Pickup Test TARGET AND SEAL-IN UNIT Pickup and Dropout Test INSTALLATION TIME-OVERCURRENT UNIT TARGET AND SEAL-IN UNIT INSTANTANEOUS UNIT PERIODIC CHECKS AND ROUTINE MAINTENANCE TIME-OVERCURRENT UNIT INSTANTANEOUS UNIT TARGET AND SEAL-IN UNIT CONTACT CLEANING SYSTEM TEST SERVICING TIME-OVERCURRENT UNIT Pickup Tests Time Tests INSTANTANEOUS UNIT TARGET AND SEAL-IN UNIT RENEWAL PARTS LIST OF FIGURES Unit 13 (Cover photo ) 2

3 TYPES TIME OVERCURRENT RELAYS 3 standards; but no such assurance is given with respect to local codes and ordinances because they vary greatly. To the extent required the products described herein meet applicable ANSI, IEEE arid NEMA information be desired or should particular problems arise which are not covered sufficiently for the purchusers purposes, the matter should be referred to the General Electric Company. possible contingency to he met in connection with installation, operation or maintenance. Should further I hese instructions do not purport to cover all details or variations in equipment nor provide for every characteristics will be found in the section on CHARACTERISTICS. in the section on RATINGS. Information on the operating time Each relay is equipped with a dual rated target seal in unit, and rating, and the tap ratings of their target/seal in units are given units, as well as information on their continuous rating, contact range of about 8 to 1. The available ranges in amperes of both Both the time delay and the instantaneous unit are adjustable over a of which are shown in Figures 12 and 13. is mounted in a standard Si case, the outline and mounting dimensions 1AC538 YES 1 FIGURE 5 IAC54B YES 2 FIGURE 7 IAC53A NO 1 FIGURE 4 IAC54A NO 2 FIGURE 6 INSTANTANEOUS CONTACT INTERNAL TYPE UNIT CIRCUITS CONNECTIONS The differences between relays are noted in the following table; described in the section on CONSTRUCTION. include a hinged type instantaneous unit, which provides inverse time/current characteristics. Some of the types covered also instantaneous tripping at high current levels. Both units are extended range, single-phase time overcurrent relays with very The Type 1AC53 and 1AC54 relays covered by these instructions are DESCRIPTION IAC53B FORM 800 AND UP IAC54A FORM 800 AND UP IAC54B FORM 800 AND UP IAC5JA FORM 800 AND UP

4 60 seconds, from the fully closed to the fully open position, when 4 protection on ground faults. 1AC53 and 1AC54 relays covered by these instructions is approximately factor may be reduced from 0.17 to 0.07 second. Then, with relay overtravel of.10 second, if the downstream breaker time is 5 contact-closing current, and its motion is retarded by a permanent close, the seal in unit picks up and seals in. When the seal in unit the time overcurrent unit, such that when the induction unit contacts its coil in series arid its contacts in parallel with the contacts of time is set by test at the current level in question, the safety trip circuit when it touches the stationary contact or contacts. The There is a target and seal in unit mounted on the front, to the left of the shaft of the time overcurrent unit. The seal in unit has devices, the reset time should be considered. The reset time of all is advantageous because it can be adjusted to provide more sensitive application are shown in Figure 15. Use of a separate ground relay single phase to ground faults. Typical connections for such an interphase faults and a separate relay, residually connected, for inverse relay were used. fault. Use of relays having the very inverse characteristic in this magnet acting on the disk to give the correct time delay. Figures 3 and 4 show the induction unit mounted in the cradle. These disk shaft carries the moving contact that completes the alarm or disk shaft is restrained by a spiral spring to give the proper cycles), the coordination time would be 0.40 second. If the relay factor. For example, if the breaker clearing time is 0.13 second (8 These coordination times include, in addition to breaker clearing allowed, depending on the clearing time of the breaker involved. time, 0.10 second for relay overtravel and 0.17 second for safety a coordination time of from 0.25 to.040 seconds is generally actuated by a current operating coil on a laminated U magnet. The units are of the induction disk construction type. The disk is CONSTRUCTION coordination. cycles (0.08 seconds) a minimum of 0.25 seconds could be allowed for set at the number 10 time dial. When setting these relays to coordinate with downstream relays, In the application of these relays with automatic reclosing and only slightly upon the system generating setup at the time of the situation will usually result in faster clearing times than if the dependent mainly upon the location of the fault relative to the relay application in locations where the fault current magnitude is overload backup protection at other locations. Their very inverse of utility and industrial distribution systems, and frequently for time current characteristic makes these relays well suited for Time overcurrent relays are used extensively for the protection The general practice is to use a set of two or three relays for The induction unit is the basic unit in all Type IAC relays. APPLICATION

5 mounted on the front, to the right of the shaft of the time The instantaneous unit is a small-hinge type unit, which may be exposed until released by pressing a button beneath the lower left corner of the cover. picks up, it raises a target into view that latches up and remains , 2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 10.0, 12.0, , 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 10.0, , 0.6, 0.7, , 1.2, 1.5, 2.0, 2.5, 3.0, 4.0 RANGE. AMPERES TAPS AVAILABLE (AMPERES) TABLE II Available taps of the time overcurrent unit are shown in Table II. IAC53B and 50/60 IAC54B IAC53A nd IAC54A 50/60 = CYCLES UNIT UNIT RELAY FREQUENCY MAIN (TIME) INSTANTANEOUS PICKUP RANGE. AMPERES TABLE I Ratings of the time overcurrent unit are given in Table I. TIME-OVERCURRENT UNIT RATINGS the target of the seal in unit also releases the target of the remains exposed until it is released. The same button that releases instantaneous unit picks up, it raises a target that latches up and connected in series with the time overcurrent unit. When the with the contacts of the time overcurrent unit, and its coil is overcurrent unit. Its contacts are normally connected in parallel instantaneous unit.

6 6 INSTANTANEOUS UNIT for high range operation (parallel connected) ,600 The continuous current ratings of the time overcurrent units are The instantaneous unit has a double wound coil for operation on TAP AMP RANGE AMP RANGE =4 according to the formula TABLE IV TABLE VI TABLE V RATING TAP AMP RANGE 4.0 shown in Tables IV, V and VI. For ratings of less than one second, the rating may be calculated TAP , ,600 (AMPS) (AMPS) where T is the time in seconds that the current flows. TIME OVERCURRENT UNIT 1-SEC RATING K RATING RATING TABLE III The one second thermal ratings are listed in Table III. either one of two ranges. Any setting obtained in the lower range (series connected) is doubled, within ±3%, when the unit is connected

7 are shown in Table VII. The continuous and one second ratings for the instantaneous units continuous rating of 6.0 amperes. connected for high range operation ( amperes) has a 8.0 amperes) has a continuous rating of 3.0 amperes, and when ampere instantaneous unit, when set on the low range (2.0 The instantaneous unit has a continuous rating of 1.5 times minimum setting or 25 amperes, whichever is smaller. Example: The 7 50 Hz impedance (ohms) Hz impedance (ohms) Carry continuously (amperes) Carry 10 amps for (seconds) Carry 30 amps for (seconds) Minimum operating (amperes) D.C. resistance ± 10% (ohms) TAP TABLE VIII Ratings for the target/seal in unit are shown in Table VIII. TARGET AND SEAL-IN UNIT -t1 S Series connected, P = Parallel connected 14 formula t Higher currents (I) may be applied for shorter P , S , P Ot 360,000 S , lengths of time (T) in accordance with the 2.0 S P ,500 P Ot 360,000 S Ot 360,000 tt RATING SECOND RANGE CONTINUOUS t ONE K TABLE VII

8 8 NOTE: The impedance values given are those for the minimum (.5/2)2 x The impedance of the 2.0 amp tap at 2.0 amperes is TIMES PICKUP PICKUP (12Z) impedance of the 0.5 amp tap is given as 4.15 ohms. example, for a relay with 0.5 amp range, the R Jx Z (AMPS) TAP PICKUP OHMS (Z) IMPEDANCE AT MIN. RANGE HZ MIN. BURDENS AT MIN. BURDENS IN CALCULATED FROM VA AT 5 AMPS Burdens for the time overcurrent unit are given in Table IX. limited by the ratings of the seal in unit. voltages not exceeding 250 volts. The current carrying rating is The current-closing rating of the contacts is 30 amperes for CONTACTS (approximately) as the square of the tap rating. For pick up current (TAP RATING) varies inversely tap of each relay. The impedance for other taps at the protective relay. does not pass through the contacts of the target and seal in coils of should be used, the connections being such that the tripping current 4.0 If the tripping current exceeds 30 amperes, an auxiliary relay TABLE IX BURDENS

9 RANGE ONLY TI ONS RELAYS 60 HZ PICKUP TIMES PICKUP - - CALCULATED FROM NEC TAP OHMS (Z) V.A. AT 5 AMPS tcon MIN. BURDENS AT MIN. BURDENS IN TABLE X The instantaneous unit burdens are listed in Table X. 9 current. setting. The unit resets at 80% of the minimum closing value of maximum distance to close the contacts; this gives the maximum time set at zero. When the dial is set at 10, the disk must travel the predetermined value. The contacts are just closed when the dial is unit requires to close its contacts when the current reaches the The setting of the time dial determines the length of time the of the IAC53 relays is within 3% of the tap value. close the contacts from the 0.5 time dial position. The pickup value Pickup of these relays is defined as the current required to CHARACTERISTICS t LOW = two windings connected in series. See internal-connections diagram for additional information HIGH = two windings connected in parallel. HIGH HIGH HIGH LOW (AMPS) OHMS OHMS OHMS PICKUP (12Z) RELAYS 50 HZ LOW 10.0 RANGE ONLY R Jx LOW IMPEDANCE AT MIN. OHMS (7) V.A. AT 5 AMPS BURDENS IN TIMES PICKUP CALCULATED FROM (AMPS) HIGH HIGH HIGH lions LOW AMPS NEC TAP tcon MIN. PICKUP BURDENS AT MIN. LOW H IGH LOW HIGH LOW LOW AMP S R Z OHMS OHMS OHMS PICKUP (12Z) IMPEDANCE AT MIN.

10 ACCEPTANCE TESTS 10 all the screws are tight. or cracked molded parts or other signs of physical damage, and that Remove the relay from its case and check that there are no broken and rating of the relay agree with the requisition. If the relays are not to be installed immediately, they should be transportation company and promptly notify the nearest General Check the nameplate stamping to make sure that the model number Immediately upon receipt of a relay, examine it for any damage VISUAL INSPECTION Reasonable care should be exercised in unpacking the relay in Since most operating companies use different procedures for These tests may be performed as part of the installation or as moisture, dust, and metallic chips. Foreign matter collected on the necessary, refer to the section on SERVICING. outside, of the case may find its way inside when the cover is disturbed. If the examination or test indicates that readjustment is removed and cause trouble in the operation of the relay. Electric Sales Office. handling is evident, file a damage claim at once with the sustained in transit. If injury or damage resulting from rough stored in their original cartons in a place that is free from sustained in shipment and that the relay calibrations have not been ACCEPTANCE TEST should be made to make sure that no damage has been Immediately upon receipt of the relay, an INSPECTION AND will be shipped in cartons designed to protect them against damage. These relays, when not included as a part of a control panel, RECEIVING, HANDLING, AND STORAGE curve for the instantaneous unit is shown on Figure 10. characteristics for relay types IACS3 and 1AC54. The time/current Figure 8 (50Hz) and Figure 9 (60Hz) show the time/current seconds. all applicable tests that may be performed on these relays. position, when the current is reduced to zero, is approximately 60 The time the relay takes to reset to the No. 10 time dial disturbed. order that none of the parts are injured nor the adjustments acceptance tests, at the discretion of the user. acceptance and for installation tests, the following section includes

11 1. There should be no noticeable friction when the disk is 2. Make sure the control spring is not deformed, nor its to its rest position. rotated slowly clockwise. The disk should return by itself MECHANICAL INSPECTION 11 by applied waveforms. AC relays (and AC devices in general) are it follows that alternating current devices (relays) will be affected fundamental frequency plus harmonics of that fundamental frequency, frequency. Since non sinusoidal waveforms can be analyzed as a All devices operating on alternating current (AC) are affected by POWER REQUIREMENTS, GENERAL circuitry. since connections are made to both the relay and the external recommended that they be tested in their cases or an equivalent steel requires C.T. shorting jumpers and the exercise of greater care, Although this test plug allows greater testing flexibility, it shorting bars in the case. The 12XLA12A test plug may also be used. makes connections only with the relay, and does not disturb any removing it from the panel by using a 12XLA13A test plug. This plug accurately duplicated during testing. A relay may be tested without case. In this way, any magnetic effects of the enclosure will be Since all drawout relays in service operate in their cases, it is DRAWOUT RELAYS, GENERAL ELECTRICAL TESTS Transformer) secondary circuits from being opened. before the main brushes do. This will prevent CT (Current high enough to engage the connecting plug or test plug circuits with shorting bars that the auxiliary brush be bent It is especially important on current circuits and other Every circuit in the drawout case has an auxiliary brush. CAUTION 5. Make sure that the fingers and shorting bars agree with the internal connections diagram. operated. by hand, and should unlatch when the target release lever is must come into view and latch when the armatures are operated wipe on the seal in contacts. freely when operated by hand; there should be at least 1/32 4. The targets in the seal in unit and in the instantaneous unit armature and contacts of the instantaneous unit, should move 3. The armatre and contacts of the seal in unit, as well as the convolut:ions tangled or touching.

12 12 electromagnets (such as time overcurrent relays) would be especially obtained by moving the permanent magnet along its supporting shelf; made by means of the time dial. However, further adjustment is The point at which the contacts just close can be adjusted by adjusting screw. This screw should be held securely in its support. The minimum current at which the contact will just close is unit requires to close its contacts when the current reaches a set on 0. When the dial is set on 10, the disk must travel the The primary adjustment for the time of operation of the unit is the maximum time setting. With the contacts just closing at No. 0 time setting, there running the stationary contact brush in or out by means of its setting. circuit, that the contacts just close at the zero (0) time dial Rotate the time dial slowly and check, by means of a lamp in the TIME-OVERCURRENT UNIT relay using tuned circuits, RL or RC networks, or saturating expressed as a finite number for any particular relay; however, any for the desired current, and then replace the connection plug. predetermined value. The contacts are just closed when the dial is The pickup of the unit for any current tap setting is adjusted by into agreement with the tap setting employed, if for some reason, Time Setting The setting of the time dial determines the length of time the value. tap plug setting. The unit resets at 90% of the minimum closing from any time dial position at a minimum current within 5% of the obtained. The unit is adjusted at the factory to close its contacts desired setting intermediate between the various tap settings to be this adjustment has been disturbed. This adjustment also permits any By turning the ring, the operating current of the unit may be brought secondary circuit. Next, screw the tap screws into the tap marked remove the connection plug, to short the current transformer means of a spring adjusting ring (See Figure 2). The ring may be top of the relay. When changing the current setting of the relay while in the case, determined by the position of the tap screw in the tap block at the purity of the sine wave (i.e., its freedom from harmonics) cannot be affected by non sinusoidal wave forms. Therefore, in order to test AC relays properly it is essential to maximum amount to close the contacts; therefore this setting gives waveforms. use a test voltage and/or current waveform that is sinusoidal. The significantly affected by the application of non sinusoidal should be sufficient gap between the stationary contact brush and its metal backing strip to ensure approximately 1/32 wipe. turned by inserting a screw driver in the notches around the edge.

13 Set the relay at the 0.5 time dial position and 2.0 amp tap. Pickup Test moving it away increases the time. moving the magnet toward the disk shaft decreases the time, while 13 *Indjcates revision at the maximum calibration mark; the pickup should be within the limits in Table XI. connections) and the target in the Down position, check the pickup With the unit connected for high range operation (parallel Pickup Test leave the test current on too long, as it may damage the unit. The instantaneous unit is rated 1.5 times minimum pickup. Do not CAUTION Once the desired pickup value is reached, tighten the locknut. repeat this operation until the desired pickup value is obtained. the current slowly until the unit picks up. It may be necessary to pickup; turning the pole piece down decreases the pickup. Bring up Loosen the locknut and turn the pole piece toward the desired setting. See Figure 2. Turning the pole piece up increases the Setting the Instantaneous Unit continuous rating. possible, use the higher range, since the higher range has a higher 7) and connected as indicated in Test Circuit Figure 14. Whenever which it is to operate (see Internal Connections Diagram Figures 5 or Make sure that the instantaneous unit is wired for the range in INSTANTANEOUS UNIT operating time should agree with the time curve value ±7%. ±0.07 second. At 2 times tap current and 10 times tap current, the (10.0 amp) to the relay. The relay should operate in 1.31 seconds Using the test connections of Figure 14, apply S times tap current * Set the relay at the No. 5 time dial position and 2.0 amp tap. Time Test positions should pick up at tap value ±5% of tap value. its contacts within ±2% of tap value current. All other tap Using the test connections of Figure 14, the main unit should close

14 setting, first remove one screw from the left hand stationary contact 0.50 OR MORE OR MORE CURRENT CURRENT TABLE XII See Table XII. holding the right hand stationary contact. To change the tap screw in the lower ampere position. The tap screw is the screw and 2.0 amperes. The relay is shipped from the factory with the p 3. Increase the current slowly until the seal in unit picks up. See 5. Decrease the current slowly until the seal in unit drops out. seal in unit should remain in the picked up position. 1. Connect relay studs 1 and 2 (See Figure 14) to a DC source, 4. Move the time dial away from the ZERO TIME DIAL Position; the Pickup and Dropout Test same time. out of adjustment. Screws should never be left in both taps at the range of 0.1 to 2.0 amperes. Table XII. 2. Turn the time dial to the ZERO (0) TIME DIAL Position. ammeter and load box so that the current can be controlled over a the first screw was removed. See Figure 2. This procedure is undesired tap and place it on the left hand stationary contact where necessary to prevent the right hand stationary contact from getting and place it in the desired tap. Next remove the screw from the The target and seal in unit has an operating coil tapped at 0.2 TARGET AND SEAL-IN UNIT AMPERES AMPERES AMPERES AMPERES TAP PICK UP DROPOUT UNIT RANGE MINIMUM CALIBRATION MAXIMUM TABLE XI 0.195

15 TIME-OVERCURRENT UNIT installation. The following tests are to be performed at the time of INSTALLATION 15 * Indicates revision be checked at an interval of from one to two years. individual requirements, it is suggested that the points listed below enough experience to select the test interval best suited to his experience with periodic testing. Until the user has accumulated will vary depending upon environment, type of relay and the user s followed. It is recognized that the interval between periodic checks In view of the vital role of protective relays in the operation of a power system, it is important that a periodic test program be PERIODIC CHECKS AND ROUTINE MAINTENANCE time. to installation, it is recommended that they be performed at this described under the ACCEPTANCE TESTS section were not performed prior performed at the time of installation. In addition, if those tests All the tests described above under Installation Tests must be TEST section. level. See SETTING THE INSTANTANEOUS UNIT, in the ACCEPTANCE 2. Set the instantaneous unit to pick up at the desired current possible, be sure to select the higher range, since it has a higher continuous rating. rear of the relay (See Internal-Connections Diagram). Whenever 1. Select the desired range by making the proper connections at the INSTANTANEOUS UNIT 2. Perform pickup and dropout tests, as outlined in the ACCEPTANCE TEST section. 1. Make sure that the tap screw is in the desired tap. TARGET AND SEAL-IN UNIT the time shown on the time current curve ±7%. value, and I = 5 times tap current. The operating time should be pickup and should be within 5% of tap value. contacts begins to flicker. This value of current is defined as close. Reduce the current until the light in series with the 14, apply approximately twice tap value until contacts just 1. Set tap screw on desired tap. Using the test circuit in Figure *2. Check the operating time at Time Dial = 5, Tap = 2 or minimum tap

16 the relay must be retested and serviced as described in this manual. the tap in service. used. This consists of a flexible strip of metal with an etch TIME OVERCURRENT UNIT 16 TARGET AND SEAL-IN UNIT SYSTEM TEST the operating current of the unit may be bought into agreement with the tap setting employed if, for some reason, this adjustment has screw driver in the notches around the edge. By turning the ring, Although this Instruction Book is primarily written to check and of a spring adjusting ring. The ring may be turned by inserting a The pickup of the unit for any current tap is adjusted by means Pickup Tests time overcurrent unit is out of limits, the unit may be recalibrated as follows: If it is found during installation or periodic testing that the SERVICING experience. will clean off any corrosion thoroughly and rapidly. Its flexibility contacts. set the IAC relay, overall functional tests to check the system ensures the cleaning of the actual points of contact. Do not use polishing action is so delicate that no scratched are left, yet is roughened surface, resembling in effect a superfine file. The CONTACT CLEANING level, as outlined in the ACCEPTANCE TESTS section. 1. Check that the Instantaneous Unit picks up at the desired current For cleaning relay contacts, a flexible burnishing tool should be INSTANTANEOUS UNIT knives, files, abrasive paper or cloth of any kind to clean relay 2. Perform the Time Tests as described in the INSTALLATION section. 1. Perform Pickup test as described in the INSTALLATION section for 1. Check that the unit picks up at the values shown in Table XII. 2. Check that the units drops out at 30% or more of tap value. TIME-OVERCURRENT UNIT operation are recommended at intervals based on the customer s deviated from their original setting. If deviations are encountered, These tests are intended to make sure that the relays have not been distrubed. This adjustment also permits any desired setting

17 Rotate the time dial to the No.0 time dial setting and check, by setting. The unit resets at 80% of the minimum closing value. dial position at a minimum current within 10% of the tap plug intermediate between the various tap settings to be obtained. The unit is adjusted at the factory to close its contacts from any time 17 time setting, apply five times tap current to the relay. With the tap plug in the 2 amp tap and the time dial at No. 5 Time Tests AMP AMP TAP RANGE TAP MINIMUM AMPS MAXIMUM AMPS TABLE XIV measured along the periphery of the disk. lower limit, check that the movement is not over one half inch (1/2 ) Table XIV, which are ±6% of tap amperes. If the disk moves at the from the stop arm. This current should be within the limits shown in time setting, check the current required to just move the disk away With the tap plug in the 2 amp tap and the time dial at No AMP AMP TAP RANGE TAP MINIMUM AMPS MAXIMUM AMPS TABLE XIII ±2.0% of tap amps. the contacts within the limits given in Table XIII, which are contacts are just open, adjust the control spring to just close With the tap plug in the 2 amp. tap and the time dial where the more, with pure resistance load boxes for setting the current. See Test Circuit Figure 14. frequency and good waveform, having a voltage of 120 volts or Connect the operating coil terminals to a source of the proper its metal backing strip to ensure approximately 1/32 wipe. should be sufficient gap between the stationary contact brush and With the contacts just closing at No.0 time dial setting, there running the stationary contact brush in or out by means of its The point at which the contacts just close can be adjusted, by adjusting screw. This screw should be held securely in its support. means of a lamp in the circuit, that the contacts just close.

18 INSTANTANEOUS UNIT 18 feeler gage in place. These closing times must be within the limits shown on Table XV. gage between the plastic residual of the armature and the pole piece When adjusting the drag magnet, be sure the outer edge of the should close with the feeler gage in place. To check the wipe of the seal in unit, insert a inch feeler Check steps 1 and 2 as described under INSTANTANEOUS UNIT above. TARGET AND SEAL-IN UNIT With the tap plug in the 2amp tap and the time dial at the No. 5 and the armature, with the armature held closed. The contacts TAP AMPS MIN.SEC. MAX. SEC. MIN. SEC. MAX. SEC. TABLE XV time setting, check contact closing at 2 and 10 times tap value. before proceeding with other time checks. Make sure the drag magnet screw clamping the drag magnet to its supporting shelf is tight does not hit the counterweight at any position of the disk inch feeler gage between the front half of the shaded pole 2. The backing strip should be so formed that the forked end (front) least 1/32 inch wipe on the contacts. Check this by inserting a bears against the molded strip under the armature. T spring should be in a horizontal plane and there should be at 3. With the armature against the pole piece, the cross member of the 1. Both contacts should close at the same time. magnet never extends out beyond the cutout in the disk. Be sure the 60HZ 50HZ increases the time. Moving the magnet in decreases the time. Moving the magnet out magnet is adjusted by loosening the nut under the magnet shelf. possible to 1.31 seconds, but at least between 1.24 and 1.38 seconds The magnet should be approximately in the middle of its travel. The Adjust the drag magnet to obtain a closing time as near as with the armature held closed. The contacts should close with the

19 When ordering renewal parts, address the nearest Sales Office of worn, broken, or damaged. carried in stock to enable the prompt replacement of any that are It is recommended that sufficient quantities of renewal parts be RENEWAL PARTS 19 for which the part is required. name of the part wanted, and the complete model number of the relay the General Electric Company, specify the quantity required, and the

20 20 of a 3 Phase Circuit 32 Phase To Phase and Ground Overcurrent Protection 10 Time Curve Characteristics of the Instantaneous Unit Saturation Curves for Lowest Taps of the Induction Unit 12 Outline and Panel Drilling for IAC54B Relays Outline and Panel Drilling for IAC53A, 14 Test Connections for Testing Pick-Up and Time Curve 15 External Connections of Three IAC53A Relays Used for of Type IAC Relays with Very Inverse Time Characteristics 28 of IAC Relays 31 and IAC54 Relays 26 and 1AC54 Relays Hz Time/CurrentCharacteristics for the Type 1AC Hz Time/Current Characteristics for the Type 1AC53 5 Type IAC53B Internal Connections (Front View) 24 6 Type IAC54A Internal Connections (Front View) 25 7 Type IAC54B Internal Connections (Front View) 25 Auxiliary Brush 21 1 Cutaway of Drawout Case Showing Position of 2 Type 1AC53 Relay Removed from Case (Front View) Type 1AC53 Relay Removed from Case (Rear View) 23 4 Type IAC53A Internal Connections (Front View) 24 FIGURE PAGE LIST OF FIGURES IAC53B and 1AC54 Relays 30

21 21 of Auxiliary Brush and Shorting Bar Figure 1 ( ) Cutaway of Drawout Case Showing Position THE TERMINAL BLOCK TRAVELS 1/4 INCH BEFORE ENGAGING THE MAIN BRUSH ON NQTE:AFTER ENGAGING AUXILIARY BRUSH,00NNECTING PLUG SHORTING BAR AUXILIARY BRUSH TERMINAL BLOCK CONNECTING PLUG CONNECTING BLOCK MAIN BRUSH

22 54 GEK Figure 2 ( ) Type IACS3 Relay Removed from Case (FrOflt View) RING CONTACT,LT (HSTNNTN(OuS I CONTACT ADJUSTING IN STR I) CT (ON S SPRING E - CONTROL DEL DRAG MAGNET RIGHT SEAL-IN UNIT STATIONAR STATIONARY UNIT SEAL- I N SHAFT -MAIN MOVING SCREW SELECT0 TAP SEAL-IN / TARGET TARGET JJ UNIT,,INSTANTANEOUS SEAL- IN HOLDING coil \ SEALIN UNIT TAP PLUG 1 ADJUSTASLE CORE INSTANTANEOUS UNIT TOP PIVOT \ TAP SELECTOR

23 DISC AND SHAFT -COIL, MAGNET. AND TAP BLOCK ASSEMBLY TIME OVER CURRENT UNIT MAGNET SHELF l! LOWER INSTANTANEOUS JEWEL SCREW i UNIT RANGE SELECTOR LEADS Figure 3 ( ) Type 1AC53 Relay Removed from Case (Rear View) 23

24 24 (Front View) Figure 5 (0227A7196 1) Type IAC53B Internal Connections TS - TARGET SEAL-IN INST. = INSTANTANEOUS UNIT * SH0RT FINGER TO TERMII JAL 4. TERMINAL #6 CONNECT B -D TO SHOWN ARE FOR LOW HIGH RANGE OPERAT1Or RANGE OPERATION. FOR NOTE:INST. UNIT CONNS UN T NST. 4-SEE NOTE Figure 4 ( ) Type IAC53A Internal Connections (Front View) INTERNAL CONNECTIONS FRONT v.ei)zshort FINGER u :1 5 6 fi StAL--N - I NOUCI ON

25 SI T UNIT INDUCTION INDUCT ON 25 UciICates re d1son Figure 7 (0246A2285 1) Type IAC54B Internal Connections TO TERMINAL 6 A SC TO TERMINAL 44. OPERATION. FOR HIGH RANGE OPERATION CONNECT NOTE ;-INSTAN UNIT CONNECTIONS SHOWN ARE FOR LOW RANGE TSI TARGET SEAL- IN *SHORT FINGER UNIT 7 UNIT INSTANTANEOUS TIME OVERCURRENT View) Figure 6 ( [5]) SHORT FINGER Type IAC54A Internal Connections (Front 1 j 2. ii UNIT SL-IN

26 26 Type 1AC53 and 1AC54 Relays Figure 8 (0108B8939 2) 50 Hz Time/Current Characteristics for the MULTIPLES OF RELAY TAP SETTING I I I I I I I 110 ID IDIQ T TT rri-- r rtrt- GE K-34054

27 ,2.5,3.0, 1.0,5.0,6.0,7.0,8.0, 0.0, 2, lime UNIT I ,0.6,0.7,0.8, 1.0,1.2,1.5,2.0,2.5,3.0)4.0 5,2.0,2.5,3.0, 1.0,5.0,6.0,7.0,8.0, 0, 12 HAT NGS I tist UNIT CON TI860USLI IJJ A U S TA OLE N 4M TIIIE UNIT TAPS INST. UNIT 4. ADJUS TN IN I S III I I I 1 Ill. I I I 1 1I III N N ! I ILII II EXIENDEL F/ NCE (800 ERIE) I II11F11 f IIliRlil 27 the Type IACS3 and 1AC54 Relays Figure 9 (0888B0270 [31) 60 Hz Time/Current Characteristics for MULTIPLES OF RELAY TAP SETTING IT L E ci 3Q, 20 ci - 4; -- :: z_ : - --, \_\ \ :: : : : : E II -a I 11 II 111,0000w !1II I I lull!.i1_ n w : I - 0 -I I. n

28 Characteristics 28 Induction Unit of Type-IAC Relays with Very-Inverse Time Figure 11 ( ) Saturation Curves for Lowest Taps of the TYPE IC REIAYS 10 E T 0 V L AMPS. AMPS AMPS..RANGE I.5 s. 0 RANGE RANGE TAP TAP TAP 22 NCtJCTION U.JTS ON VERY INVERSE SATUAT10N CURVES F0 L0WT TAPS OF LLTIPLES DF.lNIMu PiC UP CURRENT O I , b0 I O Instantaneous Unit Figure b j6 (0208A8695 1) Time/Current Characteristics of the wj(r ils f PICfUP

29 168MM MTG SEMI-FLUSH PANEL SURFACE, (2) 5/16-18 FOR SURFACE STUDS LOCATION 29 for IAC54B Relay Figure 12 ( [8]) Outline and Panel Drilling MM INCHES VIEW SHOWING ASSEMBLY OF HARDWARE FOR SURFACE MTG. ON STEEL PANELS TYPICAL DIM 76MM 3.0 FOR SEMI FLUSH MOUNTING PANEL DRILLING FRONT VIEW PANEL DRILLING FRONT VIEW FOR SURFACE MOUNTING 133MM 5MM MM I 223MM MM 112MM -I I (TYPICAL) 12MM 500 CU1tUT MM DRILLED HOLES 2 HOLES 5/8 DRILL 6MM 4 HL]LES 15 7MM 1/4 DRILL MM -Ez6, BACK VIEW ST U B S NUMBER] NC CUTOUT MAY REPLACE P32MM 4Td. RM STUD ( MM

30 30 and IAC54A Relays ON STEEL PANELS MOU4TtG FHONT ViEW Figure 13 ( ) Outline and Panel Drilling for IAC53A, IACS3B UNW G (FRONT yew) P*L DRLLW4G FOR SEMI-FLUSH STUD 35 GE K U.t L DRILLt4G FOR SURF4C 2 DRILL (FRONT VIEW) NLAIBERING OF STUDS HAROWAE FOR SURFACE MTG. view SH(G ASSEM.X OF ppanel OUTLINE

31 TO TIMER 31 Curve of IAC Relays Figure 14 ( ) Test Connections for Testing Pickup and Time 120 AT RATED FREQUENCY MIN. RECOMMENDED VOLTS, MADE WITH RELAY IN CASE. ALL TESTS SHOULD BE RELAY CHARACTERISTICS TO ACCURATELY REPRODUCE I TO TIMER VARIABLE RESISTOR XLA13 TEST PLUG >- INSTANTANEOUS UNIT CHECKING PICKUP OF TO INDICATING LIGHT WHEN. OF MAIN UNIT WHEN CHECKING PICKUP TO INDICATING LIGHT

32 32 3 Phase Circuit Relays used for Phase to Phase and Ground-Overcurrent Protection of a Figure 15 ( ) External Connections of Three Type IAC53A 51N H1 t N ( 1 A C BUS TRIP BUS j51_3

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34 GE Power Management 215 Anderson Avenue Markham, Ontario Canada L6E 1B3 Tel: (905) Fax: (905)

35 Errata Sheet 61025! 7000 Malve,-n. P Great Valley Parkway Management GE Power June 25, 1997 Also under BURDENS AT MIN. PICKUP the value for R that reads 0.40 should read On TABLE IX under RANGE; the range which reads should read PAGE On TABLE 111 under TIME OVERCURRENT UNIT the last range value which reads should read PAGE 6 at the end of the string of tap values where it reads 15.0 it should read should read Also under TAPS AVA[LABLE (AMPERES), On TABLE II of this page under RANGE, AMPERES the range value which reads IAC53A and IAC54A and [AC533 and IAC54B which reads should read On TABLE I o[this page under PICKUP RANGE, AMPERES the range value for PAGE 5 Revisions to GEK F1 pages 5, 6 and 8 MULTILIN

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