DIRECTIONAL GROUND RELAY. Type CFPC16A. G E N E R A L ELECTRIC

Transcription

1 DIRECTIONAL GROUND RELAY Type CFPC16A - L O W V O L T A G E S W I T C H G E A R D E P A R T M E N T G E N E R A L f@ ELECTRIC P H I L A D E L P H I A, P A.

2 DIRECTIONAL GROUND TYPE CFPClGA P The Type CFPClGA relay an be used as an instantaneous overurrent r slay or as a urrent polarized diretional ground relay. This is made possible by having two separate urrent iruits whih an either be left separate for diretional relays or onneted in series for a overurrent relayṫwo of these relays may be used together to produe a diretional ontrolled overurrent relay ombination by having the diretional unit ontats ontrol the floating iruit of the overurrent unit. CONTACTS RATINGS The urrent-losing rating of the ontats is 30 amperes for voltages not exeeding 250 volts. The urrent-arrying ratings are limited by the two different ratings of target and holding oils as listed in the following table: Target and Holding Coil e (o.125a% ) (%z) T=W~ing D ~Y 30 Carry Continuously 2.5 i.5 TARGET AND SEAL-IN COILS The 0.2 amperes oil is for use with trip oils that operate on urrents ranging from 0.2 up to 1 ampere at the minimum ontrol voltage. If this oil is used with trip oils that take 1 ampere or more there is a possibility that the 7 ohms resistane wilf reduethe urrent to so low a &that the breaker will not be tripped. This oil an safely arry urrents as high as 5 amperes. The 1 ampere oil should be used with trip oils that take 1 ampere or more at the minimum ontrol voltage, provided the urrent does not exeed 30 amperes at the maximum ontrol voltage. If the urrent exeeds 30 amperes, a auxiliary relay must be used to ontrol the trip oil iruit, the onnetions being suh that the urrent does not pass through the ontats or the target and holding oil of the protetive relay. When it is desirable to adopt one type of relay as standard to be used anywhereon a system, relays with the 1 ampere oil should be hosen. These relays should also be used when it is impossible to obtain trip oil data, but attention is alled to the fat that the target ma not operate if used with trip oils taking less than P ampere. BURDEN The following table gives the burden of the urrent oils at 5 amperes and 60 yles. L l-8 Pol :*;i 0: RECEIVING, HANDLING AND STORAGE T Volt- 5-6 l-8 Oper. Pol The burden at 50 yles is slightly lower. E 0: These relays, when not inluded as a part of a ontrol panel, will be shipped in artons designed to protet them against damage. Immediately up reeipt of the relay, a examination should be made for any damage sustained during shipment. If injury or damage resulting from rough handling is evident, a laim should be filed at one with the transportation ompany and the nearest Sales Offie of the General Eletri Company notified promptly. Reasonable are should be exerised in unpaking the relay in order that one of the parts are injured or the adjustments disturbed. If the relays are not tobe installed immediately, they should be stored in their original artons in a plae that is free from moisture, dust, and metalli hips. Foreign matter olleted on the outside of the ase may find its way inside when the over is removed and ause trouble in the operation of the relay. These instrutions do not purport to over alf details or variotioru in equipment nor to provide for every possibk ontingeny to be met in onnetion with installation, opemtion or maintenane. Should further information be desired or should pwtiukrr problems arise whih ore not overed wffkientfy for the purhaser s pwposes, the matter should ba referral to the Geneml Eletri Company.

3 .~ GEH-2023 Mretional Ground Relay Type CFPClBA DESCRIPTION DIRECTIONAL UNIT This unit is an indution ylinder devie for alternating urrent iruits. The priniple bywhih torque is developed is the same as that employed in an indution disk relay with a watthour meter element, through an arrangement of parts, it is more like a split phase indution motor. The stator has eight laminated magneti poles projeting inward and arranged symmetrially around a entral magneti ore. In the annular air gap between the poles and entral ore is the ylindrial part of the up-like aluminum rotor, whih turns freely in the gap. The entral ore is fixed to the stator frame; the rotor alone turns. This onstrution provides higher torque and lower rotor inertia than the indution disk onstrution, sensitive. making these relays faster and more CONTACTS The ontats are espeially onstruted to suppress bouning. The stationaryontat(g, Fig.1) is mounted on a flat spiral spring (F) baked up by a thin diaphragm (C). These are both mounted in a slightly inlined tube (A). A stainless steel ball (B) is plaed in the tube before the diaphragm is assembled. When the movtng ontat hits the stationary ontat, the energy of the former is imparted to the latter and thene to the ball, whih is free to poll up the inlined tube. Thus, the moving ontat omes to rest with substantially no rebound or vibration. All eight poles have urrent windings. There are two groups of four oils onneted in series. The four orner oils have an additional winding whih onsists of many turns of fine wtre. A apaitor is onneted aross these fours oils in series to produe a phase shift in the flus so as to produe torque. This flmttng iruit is brought out to two studs so that the relay an be ontrolled by another devie if desired. Whenusedasa diretional relay, maximum torque is obtained when the urrent in studs 5-6 leads the urrent in studs 7-8 by approximately twenty degrees. Fig. I Stationary Contat Assesbly LOCATION The 1oatSon should be lean and dry, free from dust and exessive vibration, and well lighted to failitate inspetion and testing. MOUNTING The relay should be mounted on a vertial surfae. The outline and panel mounting diagram is shown in Fig. 2. *CAUTION: Every iruit in the drawout ase has an auxiliary brush, this is the short one in the ase (not on the radle) whih the onnetion plug or test plug should engage first. On every urrent iruit or other iruit with a shorting bar, make sure these auxiliary brushes are bent high enough to engage the onnetion plug or test plug before the main brushes in the ase do, as otherwise the CT seondary iruit may be opened (where one brush The relays are adjusted at the fatory and it is advisable not to disturb the adjustments. If, for any reason, tbey have been disturbed, the following points should be followed in restoring them. 4 Denotes hange sine superseded issue. INSTALLATION ADJUSTMENTS touhes the shorting bar) before the iruit is ompleted from the plug to the other main brush CONNECTIONS The internal onnetion diagram is shown in Fig. 3. Typial external wiring diagrams are shown in Figs. 4 and 5. When using the relay with external ontrol, remove the jumper from studs 3-4 andonnettbese studs aross the ontats of the ontrolling devie. Thus when the ontats of the ontrolling devie lose, the floating iruit is now losed and torque is developed. One of the mounting studs or srews should be permanently grounded by a ondutor not less than No. 12 B&S gags opper wire or its equivalent. PICK-UP The pik-up urrent is adjustable over a range whih depends on the relay rating. Adjustment is

4 Diretional Ground Relay Type CFPClGA GEH-2023 PANEL LOCATION SEMI-FLUSH SURfACE TMTG MTG7. f 7 OUTLINE CASE DRILL * 2 HOLES $mll I 10 HCCES MOUNTING 1FRON-f VIEW) U VlEW.SHOWIFIG ASSEMBLY OF HARDWARE FOR SURFACE NTG. ON STEEL PANELS PANEL DRILLING FOR SURFACE MOUNTING (FRONT VEWI

5 I - GEE-2023 LXretional Ground Relay Type CFPClGA i xi Fig. 3 Internal Connetions For Type CFPCIBA Relay Fig. 9 External Cennetims Of Type CFPCIGA Relay For Overurrent Ground Protetion Fig. 5 External Connetions Of Type CFPCl6A Relay For Diretional Ground Protetion Fig. 6 Teat Connetions For Type CFPCl6A Relay 6

6 Diretional Ground Relay Type CFPClGA GEH-2023 > IU CURVE A-l!lb..-..._..-, CURVE R-140 TlhiES FIIN. P.U. CUKVE C-TIIREE TIMES MIN. t.u. CURVE 0-hAS.IMUII t'ichup 0 4 HU?TIPLES OF PICKUP CERRENT 6 IO 12 Fig. 7 Time-Current Charateristis Of Type CFPCIGA Relay L made by ontrolling the restraining torque of the upper ontrol spring. To hange the level of pik-up urrent, loosen the hexagonal-head loking srew loated toward the rear of the adjusting ring guide at the top of the relay. Moving the adjusting ring lok&se (as viewed from the top) dereases the spring restraining torque, and hene lowers the pik-up urrent. When the desired pik-up is obtained, the loking srew should be tightened. If a test of the pik-up time is desired, it is neessary to use an osillograph or an eletroni timer beause the speed of the relay is suh that a mehanial timer is unsatisfatory. The timeurrent harateristis are shown in Fig. 7. CONTACTS To adjust the wipe of the stationary ontat, remove the ontat barrel and sleeve as a omplete unit after loosenihg the srew at the front of the ontat blok. Unsrew the ap (E, Fig. 1). The ontat and its flat spiral mounting spring may then be removed. The spring should be ad usted so that a ontat wipe of approximately inh is obtained when fully assembled. This may be measured by rotatin the ontat barrel 45 to 90 degrees (l/;it;;~~~*) after initial onnetion with the The ontat gap may be adjusted by loosening slightly the same srew at the front of the ontat blok. The srew should be loose enough only to allow the ontat barrel to rotate in its sleeve. The right stationary ontat barrel or the stop srew fastened with a loknut, whihever is used, should hold the moving ontat arm in a neutral position, i.e., with it pointing diretly forward. Then bring the left stationary ontat up until it just touhes the moving ontat by rotating the ontat barrel. Next, bak it away 2/3 turn to obtain approximately inh ontat gap. Last, tighten the srew whih seures the barrel. When a rear normally open ontat is present, it should be adjusted to make at or just after the front left ontats have made, but before they have wiped in. The moving ontat may be removed by loosening the srew whih seures it to the ontat arm and sliding it from under the srew head. CLUTCH ADJUSTMENTS Cluth adjustment is made with testonnetions shown in Fig. 6 with the adjustable resistor apable of ontrolling the urrent in the urrent oils between 5 and 35 amperes. A srew on the side of the moving ontat arm ontrols the luth pressure. Using rated frequeny, the luth should be set to slip at the proper urrent as shown in the table below: Pik-up Amps Rating Amps for Cluth to Slip O 10 ;:;t :i Must Not Slip At 30 Amps A

7 : -GEH-2023 Diretional Ground Relay Type CFPClGA HOLDING COILS adjusted appreiably below inh. CONTACT CIRCUIT The loation of eah holding oil may be adjusted by loosening the mounting srew and sliding the oil either to the left or right in a groove pro- The normally losed ontat iruit of the Type vided for that purpose. The holding oils are loated CFPClGA relay is provided with a shorting bar at the fatory so that there is a gap of about whih ompletes the external iruit when the on inh between the pole piees andthearmatwe. netting plug is removed. If this ation is not A gap of inh is equivalent to l-1/4 turns of desired, the shorting bar may be removed by rethe ontat barrel. The holding oil gap must not be moval of the mounting srew in the ase. INDUCTION UNIT If, for any reason, it beomes neessary to disassemble the indution unit, the following proedure should be followed: sonnet the leads to the unit at the ter- Inina ifthe base.,,,(13~o,engv~se unit intat with its mounting () Remove the upper srew supporting the unit on the mounting plate. (d) Avoiding any disturbane to the top bearing plate, remove the enttre top molded struture and rotor assembly from the stator assemby by removing the four orner srews. This will give aess to both the rotor and stator assemblies and all parts will be aligned by the dowel pins when PSplWed. (e) To remove the rotor assembly from the top molded struture, remove the small pin from the groove at the upper end of the shaft and bak off on the luth srew loated on the right side of the movable ontat arm. Use are in handling the rotor while it is out of the relay, and see that the air gap and rotor are kept lean. In reassembly, the rotor will go into the air gap easily without foring if the parts are held in line properly. BEARINGS The lower jewel srew an be removed from the unit by means of an offset srew driver or an end wrenh. The jewel may bs tested for raks by exploring its surfae with the point of a fine needle. If it is neessary to replaethe jewel a new It is reommended that suffiient quantities of renewal parts be arried In stok to enable the prompt replaement of any that are worn, broken or damaged. When ordering renewal parts, addressthenear- MAINTENANCE RENEWAL PARTS pivot should be srewed into the bottom of the shaft at the same time. The lower jewel bearing should be srewed all the way in until its head engaages the end of the threaded ore. justed to allow a,,:el,$?%;,t%u?b%% Press down on the ontat arm near the shaft to hek the learane between the iron ore and the inside of the rotor op and thus depress the spring mounted jewel until the up strikes the iron the shaft should move about l/16 inh. CONTACT CLEANING For leaning fine silver ontats, a flexible burnishing tool should be used. This onsists of a flexible strip of metal with an ethed roughened surfae, resembling in effet a superfine file. The polishing ation is so deliate that no srathes are left, yet orroded material will be removed rapidly and thoroughly. The flexibility of the tool insures the leaning of the atual points of ontat. Fine silver ontats should not be leaned with knives, files, or abrasive paper or loth. Knives or files may leave srathes whih inrease aringand deterioration of the ontats. Abrasive paper or loti may leave minute partiles of tnsul%ting abrasive material in the ontats and thus prevent losing. The burnishing tool desribed is inluded in the standard relay tool kit obtainable from the fatory. PERIODIC TESTING An operation test and inspetion of the relay at least one every six months are reommended. A hek of minimum operating urrent is suffiient to insure orret operation. Inspetion should inlude a hek of ontat onditions, a searh for foreign matter, and a test of the freedom of movement of the moving ontat arm. est Sales Offie of the General Eletri Company, speify quantity required, name of part wanted, and give omplete nameplate data. Referene an be made to publiation GEF If possible, give the General Eletri Company requisition number on whih the relay was furnished. GENERAL ELECTRIC COMPANY, PHILADELPHIA, PA.