INSTRUCTIONS - Electrical Part Manual S
TYPES MA-75C,.MA-250C and MA-350C,5-KVlectriAIR MAGNETIC CIRCUIT BREAKERSwithwwFw.ESTORED ENERGY OPERATORS'·.NO. 515-118X5165February 1974
.comATTACH TO:1BX5165February 197lJCORRECTION SHEETualsThis sheet(s) notes changes which should.be made in the attached, instruction booklet:CIRCUIT BREAKERt 1A-75Cl,MA-250Cl18X5165and MA-350Cl,Air Ma gn etic ircuit Breakers5-KVanTypesINSTRUCTIONS. · withStored Energy Operator13.,ProcedureD title shouid read:Procedure D."BreakerParagraph shouldOperirea6asfollows:Open illustration of Fig. 10)Dimtmsion "d" (Breakeris meas u re d between the d i sconn e c t arm and the bo t t omof the sec.ond finger iri the main c on t a c t assembly.The open position j,s determined by t he se t t i ng ofthe rod end (40, Fig. } at the top of the pufferThe rod end (if' set too low) can effectpiston 'rod.The optimum11).the trip latch roller. clearance (Figsetting is to obtain the maximum open co nt act gap "d"while maintaining the specified trip latch rollerAclearance (see trip latch adjustment page 14).'dimension "d" of less than 3-11/16 in. indicated improper-lP·trica·Position"arON PAGE515-1tMNO.-·w.Elecadjustment.wwThese instructions do not purport to cover all details or variations in equipment nor to provide forevery possible contingency to be met in connection with installation, operation or maintenance.SWITCHGEAR
----INTRODUCTIONWarranty.ReceivingStorage.1, , . . . . , . . 1Tilting Arc ChutesBarrier Stacks. . . . . . . . . . . . . . . . . . . . . . . . .11: . . . . . . .11.1Servicing Disconnect Arms1Contact P ressure of Hinge Joint. ., . , .1Circuit Breaker PreparationArcing Contact Hinge JointContact Alignment.Auxiliary Switch.Arc Interruption , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Inter lock Plunger.Operatoi·s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Trip Latch Adjustments.Stored Energy Operator.Trip Latch Check SwitchAuxiliary EquipmentAuxiliary Switch.Capacitor Trip Device. . .,. ·. .,3.3.4, . . . . . . . . . . . . . . . . . . . . . . . , . . . . . .4.Arc Chute AssemblyCircuit Breakers.4.4.DESCRIPTION OF OPE RATION.6. , . , . . .6Spring Charging Cycle, . . . . . . . . . . . . . . . . . . . . . . . . . .6 .Trip Latch Check SwitchBreaker Closing Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Tripping Cycle.Stored Energy Operator. .- Components NomenclatureStored Energy OperatorClosing Ci rcuit.7.7. . . . . . . .8. .Spring Release Latch- Mechanical and E lectricalInterlocks.9.: . .9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9.Phase Barrier Assembly.11.12. . . . . . . . . . . . . . . . . . . . . . . . 12. .12, . . . . . . . . . . . . . . . . . . . 14.14. . . . . . . . . , . . . . . . . . . . . . . . . . . 14., . 15.15.15Removal of Spring Blocking Device., . . . . . . . . . . . . . . 15Removal of Power Springs.M aintenance Slow Close.Maintain a Firm Grip on Crank.1516Motor Cutoff Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6Motor Cutoff Switch Adjustment.Spring Release Latch Bite Adjustment. .1617Spring Release Latch Check Switch Adjustment.1 7Free Height Adjustment.17.Trip Adjustment.17Overtravel.17.17.Closing Latch Mechanical InterlockMAIN TENANCE.19.19Mech!lnis m- Stored Energy Operator.19Closing Spring Removal. .19General.,.,. . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . 20Met hod for Cleaning Bearings.20Air Puffers . . . . . . . . . . . . . . . . . . . . . . , , . . . . . . . . . . . 2011caCircuit Breaker Timing.lP. . . . . . . . . . . . . . . . . . . . . . . . . . . .11., . . . . . . . . . . , . . . . . . . . 12.LubricationADJUSTMENTS. . .Maintain a Firm Grip on CrankarSpring Recharge After Closing.M anual Charging of Closing Springs, . , .5.an.tM.uals3DESC R IPTION).comINDEXILLUSTR ATIONS ---. . . . . . . . . . . . . 22Fig.11Trip Latch Clearance Adjustment,. . . . . . . . . . . . . . . 23Fig 12Trip Latch Bite and Check Switch Adjustments1Circuit Breaker Handling Instructions2Typical Circuit Breaker Assemblies4Breaker Contacts.3 Description ofFig . 5. Fig.Fig .Fig.Fig.79.32.33·Fig. 1 3 Maintenance Close Spring Blocking Device I nsertion , . , . 34., . . . . . .24.25Fig. 1 4Motor Cutoff SwitchType 0-1 0 Auxiliary Switch. .Fig. 1 5Spring Release Latch Bite and Check Switch Adjustments .26. . .Description of Operation.Description of Operation.Stud and Support Assemblywww. , . 35.36.27Fig. 1 6Closing Spring Dump Mechanism, . . . . . . . . . . . . . . . . . . . 28Fig. 1 7Spring Release Latch Mechanical Interlock29Fig. 18Frame and Operator, Drive Assembly andFig . 1 9Lubrication Points on Breaker . ,. . 40Fig. 20Lubrication Chart . .41.Control Scheme for Stored Energy Operator.EFig. 10.6 Arc Chutes8.Operation·lecFig.F igtriFig.Fig.Linkage Assembly Lubrication. . 30.31., , . 37. . . 38. . . . . . . . . . . . . . . . . . 39.
.com515-1 Operation BookINTRODUCTIONWARRANTYThe sales contract carries all information0:1warranty coverage.RECEIVINGualsThis instruction manual contains installation, operation and maintenance information for TypesMA-75C, MA-250C and MA-350C stored energy operated, 5-kv air magnetic circuit breakers.anCircuit breakers are shipped from the factory completely assembled. Observe weight markingson crates and ensure that capable handling equipment is used.tMRemove crating carefully with the correct tools. Check each item with the shipping manifest.If any shortage or damage is found, immediately call it to the attention of the local freightagent handling the shipment. Proper notation should be made by him on the freight bill. Thisprevents any controversy when claim is made and focilitotes adjustment.lParWhen handling breaker (Fig. 1) with a crane or hoist, hooks should he attached only to breakerframe. Use a spreader to prevent frame distortion and/or damage to arc chutes. Do not attachlifting hooks, rope, etc., to bushings, insulating parts, fittings, etc. Do not slide breaker offshipping skid without using ramp blocks (T-Shaped pieces) provided as interlock plunger andlinkage may be damaged.caSTORAGEtriIndoor- The circuit breaker should be installed as soon as possible. If storage is necessary, itshould be kept in a clean dry place where it will not be exposed to dirt, corrosive atmospheresor mechanical abuse.lecOutdoor - Outdoor storage of circuit breakers is not recommended. If breakers must be storedoutdoors, they must be covered completely and a heat source provided to prevent condensationand subsequent corrosion.CIRCUIT BREAKER PREPARATION.EPrepare the circuit breaker for insertion into its cubicle as follows:Remove Packaging. Note: Breakers are shipped in closed position with the trip rodand foot lever enclosed by packaging to prevent opening during shipment.w1.Push manual trip rod to open breaker.3;Remove phase barriers and unfasten both front and rear blowout coil connections. (See"Phase Barrier Assembly", page 11.)ww2.-1-
With arc chute support in place at the rear of the breaker, tilt the arc chutes (refer topage ll for detai Is) to expose contact area.5.Remove dust, foreign particles, etc., from breaker.Inspect ceramics for possible shipping damage.ualsSA.Check for mechanical freedom of disconnect arm movements by slowly closing thebreaker. Reference page 15 for Close Slow Procedure.7.Trip breaker by depressing trip rod, Fig. 2, Item 4 3.8.Return arc chutes to upright position, fasten both front and rear blowout coil con nections and replace phase barriers. Be sure screws on all phases are tightenedsecurely.9.Install plug jumper and energize control. (Springs should charge.)tM}an6.10.Close breaker11.Trip breaker12.Depress foot lever and close electrically (*) .13.ReI ease foot I ever and repeat steps 1014.De-energize control power and remove plug jumper.15.Coat movable primary and secondary disconnects with a light film of A-C contactI ubr:icant, 15-171-370-002.16.Insert breaker into its cubicle to "disconnect" position and close manually (*) .17.Comp I ete movement of breaker to 11 test 11 position and repeat steps (10 (#) and 11arand 11 tricalP(II)With line and bus de-energized, rack breaker into fully connected position. Closeand trip breaker from main control panel. If bus or line are energized, get clearancebefore beginning this step.Lock out Kirk interlock (if provided) and repeat step 10 (*)21Open interlock and repeat steps 10w20. 22. Check for proper alignment between stationary and movable secondary contacts. Checkfor proper alignment between aux. switch bayonet on cubicle wall and operating forkon breaker.E19.with control switch oncubicle panel.lec18.ww.com4.(#)and 1 1Breaker is now ready for normal operation.(*) Breaker is trip free.(#) Breaker will close.-2-
.comD E S CRIPTIONualsA typical circuit breaker consists of primary disconnec t, arc chute, and operator sections. Theprimary disconnect section con tains the main contacts, which supply power to the load. The arcchute section dissipates the power arc drawn during the opening of the main contacts . Theoperator section contains the mechanism used to close and open the main contacts. This mech anism consis ts of a s tored energy operator wi th its associated control circuitry.AR C INT ERRUPT IONanArc interruption is accomplished in free air at a tmospheric pressure with the aid of a self induced, magnetic blowout field and forced air draf t. When the trip solenoid is energized,load current is being carried by the main contacts. As the contacts open, the main con tac tspar t first and the current is transferred to the arcing contacts. When the arcing contacts par t,an arc is established between them .artMThe arc between the arcing con tacts is transferred to the arc runners as the arcing contacts open.The transfer of the arc to the arc runner establishes full current flow through the blowout coils,setting up a s trong magne tic field. The magnetic field, accompanied by the natural thermaleffects of the heated arc, tends to force the arc upward in to the barrier stack . The cool surfacesof the barrier stack cool and de-ionize the arc, while the V-shaped slo ts in the s tack reduce i tscross-section and elongate it, leading to rapid extinction . The arc runners are made of wide,heavy material for maximum heat dissipation and for minimum metal vaporization .calPA puffer mechanism provides a forced air draft through the main con tact area . This aids themagnetic blowout field and natural thermal effects in forcing the arc in to the barrier s tack foreasy extinction .OP ERATOR S triThe breaker is closed by the operator s traightening a toggle in the four-b r linkage (Fig.I tern 12) The operator is powered by precharged springs (s tored energy)7, lecStored Energy Operator.EThe s tored energy operator (Fig . 3) uses charged springs to power the closing operation. Openingis spring-powered also, but not with the same springs used for closing. A s tored energy operatorconsists of three systems: spring charging drive, cam and ra tchet assembly, and the four bartoggle linkage (Fig. 4, A - D) . These systems are disengaged from each o ther excep t whileperforming their specific functions . For example - the spring charging drive and cam-ratchetassembly are disengaged except when the cam-ratchet arrangemen t is being charged. Similarly,the cam-ra tchet and four bar I inkage are free of each other except during closing .wStored energy opera ted breakers normally require a single commercial relay for con trol . Thisrelay is furnished to match the control voltage.wwTrip Latch Check Swi tchThe trip la tch check switch is supplied with breakers intended for instantaneous reclosing duty .The swi tch monitors the position of the trip latch, and will function to preven t the breaker fromclosing electrically until the trip la tch is reset.-3-
.comAUXILIARY EQUIPMENTAuxiliary SwitchualsMounted on the breaker, the auxiliary switch is normally used to open the 7rip clrcuii· when thecircuit- breaker is opened. As this multi-stage switch operates from the breaker disconnectblade: , circuitry dependent on the position of the breakei·, such as indicator lights, etc. , iswired through this switch. The individual stages are easily converted to 11011 or "b" withoutdisassemb! ing the switch (Figure 5).Capacitor Trip DeviceanA capacitor trip device is commonly used with circuit breakers havi11g an ac control supplyinstalled in remote locations of unattended substations where battery cost and maintenanceare undesirable.tMIn these cases, the capacitor trip device may be charged from the same stepdown transformerthat is used to energize the breaker control. This stepdown transformer should be connectedto the I ine side of the breaker.arTo apply the capacitor trip device to existing breakers originally shipped with de trip coils,contact your Allis-Chalmers sales representative.lPARC CHUTE ASSEMBLYEach arc chute (Fig. 6) consists of a frame retardant envelope which provides phase isolation forinterruption and venting of the by-product gases of interruption. The arc chute contains The stationary end arc runner. (4) and moving end arc runner (3) to which the arcterminals transfer from the arcing contacts. The arc runners from paths for the arcterminals to travel up the arc chute.2.The stationary end blowout coil (15) and moving end blowout coil (13) which connecttheir respective arc runners to the top and bottom bushings. The current in these coilscreates the magnetic flux which passes through cores (18), pole pieces (22) and thespace between the pole pieces. The action of this flux on the arc forces the arc upthe barrier stack.trilecThe barrier stack (23) consisting of a number of refractory plates, with "V-shaped"slots, cemented together. The barrier stack cools, squeezes and stretches the arc toforce a quick interruption.E3.ca1.4.The barrier (1) containing coolers (28) through which the by-product gases of inter ruption pass, completes the cooling and deionizing of the arc products.wwwArc chutes are ti I ted to expose contact area for inspection of barrier stack (23). The arc chutesmay also be I ifted and removed from the breaker. Unfasten front and rear coi I connectionsbefore tilting or removing arc chutes.-4-
.comOP ERAT IONCIRCU IT B R EAK E R SualsNormal -- Normal circuit breaker operation is controlled by cubicle mounted controls or othercontrol devices. The closing springs of stored energy operated breakers will charge as soon asthe breaker control bus is energized. Check the motor cutoff adjustment (page 36) if springs donot charge.Opening Breaker -- Stored energy operated breakers can be tripped manually by depressing thetrip rod (4 3), Fig. 2, or electrically by energizing the trip circuit. This rotates the latch thatallows the closing linkage to collapse and reset.www.ElectricalPartManClosing Breaker -- When the springs of a stored energy operated breaker are fully charged, itcan be closed by pulling the manual close pull rod (21), Fig. 7, or electrically by energizingthe closing circuit. This rotates the latch that allows the springs to close the breaker.-5-
SP R I NG CHA RG ING CYC LE.comDE S C R IPT ION O F OP E RAT IONtManualsEnergization of the Breaker Control Circuit will cause the spring charging motor (1, Fig. 7), tostart charging the closing springs (6, Fig . 3). The spring charging motor (1) will drive thedriving pawl (2, Fig. 3), through an eccentric drive shaft (3, Fig . 3). The driving pawl (2)will turn the ratchet wheel (4, Fig . 3), counter-clockwise one tooth at a time . The holdingpawl (5, Fig. 3) will hold the ratchet in position between driving strokes of driving pawl (2).This charging operation wi II continue turning the ratchet wheel (4) counter -clockwise a toothat a time until the closing springs (6) are fully charged (dead center) . The motor will drive theratchet wheel past this dead center position and the closing springs (6) will aid rotation drivingthe ratchet wheel and cams counter-clockwise until spring release rollers (8, Fig. 7), on theinside surfaces of cams (7, Fig . 7), engage the spring release latch (9, Fig . 7) . This arrests themotion of the ratchet wheel (4) and the cams (7) and holds the operator in the fully chargedposition. As the cams and ratchet wheel go over center, the motor cutoff switch (10, Fig . 3),is actuated to de-energize the spring charging motor (1). The spring charging motor then coaststo a stop, driving pawl (2) oscillating in the toothless section of the ratchet wheel .The motor cutoff switch (10) provides four functions:It de-engergizes the spring charging motor (1);2.It opens a contact in the anti-pump relay circuit;3.It sets up the closing coiI circuit;4.It can be used to energize an indicating light to indicate that the closing springs (6)are fully charged .calPar1.NOT E:triA close latch check switch (16, Fig . 3), is in the motor circuit . The close latch check switchmonitors the position of the spring release latch (9) and will prevent charging of the closingsprings (6) electrically unless the spring release latch (9) is in the correct position.ElecAs the energy is stored in the closing springs, the four bar linkage (12, Fig . 7), will bepositioned by the Iinkage reset spring (11, Fig . 8), which acts to cause cam follower rollers (13,Fig . 3), to follow the surface of cam (7, Fig. 7), until the links are in a reset position, andallowing latch rollers (20, Fig . 3), to be positioned in front of trip latch (18, Fig . 3).The charged position of the operator is shown in Fig . 7 .T R IP LAT CH C H E CK SW IT CHwwwThe trip latch check switch (19, Fig . 3), (when furnished) (supplied with breakers applied toinstantaneous reclosing duty) monitors the position of the trip latch (18, Fig . 3) . This switch isin series with the spring release solenoid and will prevent initiating the closing cycle electri cally unless the trip latch (18) is reset .-6 -
.comBREAK ER C LO S ING CYC L EanualsEnergizing the spring release solenoid (13, Fig . 7), will drive the spring release latch (9, Fig .7), away fro m the spring release rollers (8, Fig . 7), on the cams (7, Fig . 7), releasing the storedenergy in the closing springs {6, Fig . 3) . The closing springs {6) will drive the ratchet wheel. (4, Fig . 3), and the cams {7, Fig. 7), counter-clockwise at a high rate of speed . The cams (7)will engage the cam follower rollers (14, Fig. 3), of the four bar linkage (12, Fig . 7), anddrive them forward causing the four bar linkage to become straight . As the four bar linkage(12) becomes straight, it drives the radius arm (15, Fig. 7), upward causing the breakercontacts to close and the o
contact your Allis-Chalmers sales representative. ARC CHUTE ASSEMBLY Each arc chute (Fig. 6) consists of a frame retardant envelope which provides phase isolation for interruption and venting of the by-product gases of interruption. The arc chute contains - 1. The stationary end arc runner. (4) and moving end arc runner (3) to which the arc (22 .
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P100 Partial Plumbing Plan ELECTRICAL E001 Electrical Notes E002 Electrical Symbols E003 Energy Compliance ED100 Electrical Demo Plan E100 Electrical Lighting Plan E200 Electrical Power Plan E300 Electrical One-Line E400 Electrical Schedules The Addenda, if any, are as follows: Number Date Pages . .
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ATE210 – Electrical Workshop 14 Module 1: Safety 1.7 Electric Shock An electrical shock is received when electrical current passes through the body. You will get an electrical shock if part of your body completes an electrical circuit by: 1. Touching a live wire and the electrical ground as shown in Figure 1. 5. 2.
Memosens Electrical connection Endress Hauser 7 3 Electrical connection LWARNING Device is live Incorrect connection may result in injury or death ‣ The electrical connection may be performed only by an electrical technician. ‣ The electrical technician must have read and understood these Operating Instructions and must follow the instructions contained therein.
positive. The unit of electrical charge is the coulomb (symbol: C). Electrical current An electrical current is the movement of negative electrical charges (electrons) through a conductor (electrical wire, metal foil, etc.). In an electrical circuit, the current flows from the point where the electrical potential is highest to the point where .
