Richards 137NP Instruction Manual Download

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Network Protector Instruction

Manual

Type 137NP

800 to 3500 Amperes

ichards

MANUFACTURING COMPANY, SALES, INC.
517 LYONS AVENUE, IRVINGTON, NJ 07111
Phone 973-371-1771 Fax 973-371-9538

IM 1224-001B

Summary of Contents for 137NP

Page 1: ...Network Protector Instruction Manual Type 137NP 800 to 3500 Amperes ichards MANUFACTURING COMPANY SALES INC 517 LYONS AVENUE IRVINGTON NJ 07111 Phone 973 371 1771 Fax 973 371 9538 IM 1224 001B ...

Page 2: ......

Page 3: ...ply to any equipment part or component requiring repair or replacement due to improper use or when determined to have been subjected to abnormal operating conditions or in the event of buyer s failure to follow normal maintenance procedures No warranty or guarantee expressed or implied including any warranty or representation as to the design operation merchantability or fitness for any purpose is...

Page 4: ...r energize a partially assembled network protector Use extreme caution when installing or working on an energized protector Use insulated tools and gloves when working on energized network protectors Perform all appropriate electrical tests before any installation or operation of the network protectors WARNING Before unpacking installing servicing or operating 137NP network protectors read this ma...

Page 5: ...iii Submersible Transformer Mounted ...

Page 6: ...iv ...

Page 7: ...Phasing 11 B Manual Operation 11 C Electro mechanical Relays 11 D ETI MNPR Microprocessor Relays 12 E Electrical Testing 12 F Checking the Minimum Tripping Voltage 13 G Checking the Minimum Motor Closing Voltage 13 H Checking the Motor Control Device 14 I Mechanical Checks 14 J Return to Service 14 V THE REMOVABLE UNIT 15 A Arc Quenchers 15 B Contact Construction 800 through 1875 Ampere Protectors...

Page 8: ...andle 36 C Packing 37 VII DIAGRAMS Wiring Diagram 125 216 Volt 800 1875 Amp Protectors 38 Schematic Diagram 125 216 Volt 800 1875 Amp Protectors 39 Wiring Diagram 277 480 Volt 800 1875 Amp Protectors 40 Wiring Diagram 277 480 Volt 800 1875 Amp Protectors 41 Wiring Diagram 125 216 Volt 2000 3500 Amp Protectors 42 Schematic Diagram 125 216 Volt 2000 3500 Amp Protectors 43 Wiring Diagram 277 480 Volt...

Page 9: ...of the fuses without opening the cover The enclosure is provided with an external handle for manual operation of the breaker unit This handle may be mounted on either side of the case as desired A pressure test valve is provided so that the enclosure may be tested for air tightness Convenient pipe plugs are also located on the side of the enclosure to permit installation of external auxiliary circ...

Page 10: ...e should be exercised when unpacking a protector so that no damage is caused in any way and a careful inspection made to see that no parts are damaged missing or destroyed with the packing material Mounting hardware transformer mounted protectors is shipped in separate cartons Relays are shipped in separate cartons In handling or storing network protectors always keep top up as marked on packaging...

Page 11: ...al and assembled to the clean surface of transformer throat flange This gasket will be held in position by the dowel pins on this flange Lift the protector enclosure and guide it into position using the dowel pins provided on the transformer throat flange Then tighten all throat bolts down evenly so that the throat gasket is compressed from about 40 percent to 50 percent of its thickness Add the f...

Page 12: ...ctor the enclosure may be opened by unscrewing the cover bolts If necessary pry the cover open but do not damage the gasket with the instrument used to pry the cover loose E Removing the Breaker Unit see Figure 1 and 2 Submersible and Non Submersible Protectors Remove the fuses and disconnects as outlined below for the different arrangements of protectors Then lift the folding rails up and forward...

Page 13: ...reaker units for the various arrangements of equipment mounted protectors may be removed in a manner similar to which the breaker units are removed from submersible and non submersible protectors Figure 1 Removable Unit Rolled Out On Rails ...

Page 14: ...6 Figure 2 Removable Unit Supported From Lifting Eyes ...

Page 15: ...ew network protectors are wired for microprocessor type relays unless otherwise specified 1 Closing In On Dead Networks a Electromechanical Relay Network protectors with electromechanical relays may not close on a dead network to which there is no connected load To be sure protectors will always pick up a dead network particularly on a new system or on spot networks for power only it is recommende...

Page 16: ...ng excessively Twenty five operations or less are not excessive for initial installations and even fifty operations are not too many if the network load is to be increased soon Additional load will eliminate a large percentage of the operations If the number of operations during the first 24 hours is considered excessive a check should be made to see that the mechanism operates positively If it do...

Page 17: ... 17 If necessary add sufficient 4 hydraulic oil f Remove one brush holder and brush from motor and inspect commutator surface with flashlight If necessary remove and disassemble motor and clean commutator g Lubrication of the motor bearings should not be necessary during the life of the motor However if lubrication is found necessary after a number of years remove the motor dismantle it wash the b...

Page 18: ...ng on or inspecting the protector Test caps Figure 3 located on the auxiliary panel below the breaker mechanism provide a means of disconnecting control wiring from the main circuit This is accomplished by removing insulated test caps to de energize control wiring and tightening these test caps to energize control wiring With the insulted test caps removed provision is made on the projecting studs...

Page 19: ...correct operation of the electromechanical type network master relay depends upon the application to the relay coils of currents and voltages of the proper phase sequence For this reason the phase sequence of the network should be checked before putting a protector into service This can be done by making a temporary reconnection of the phasing relay and observing its operation as follows 1 Make th...

Page 20: ... No 6 6A of the phasing relay plug if provided a On 120 216V units connect a 216V source to studs K and L to energize the operating circuits Connect the closing contact of a control switch to terminals 2 and 3 wire No 6 11 of the master relay plus and a tripping contact to terminals 1 and 3 wire No 41 11 Activate the closing contact of the control switch If the manual operating handle of the prote...

Page 21: ... terminals 1 and 3 wire No 41 11 of the master relay plug Activation of this contact should trip the protector G Checking the Minimum Motor Closing Voltage Using the auto transformer test set up as described in Figure 4 apply 157 volts to studs K and L on 125 216V units and 200 volts to studs 11 and 3A on 277 480V units Connect the closing contact of a control switch to terminals 2 and 3 wire No 6...

Page 22: ...lts 2 For 277 480V units the motor control device should never pick up at 212 volts and should always pick up at 230 volts Apply these values to studs 11 and 3A and repeat test 1 Where laboratory test facilities are not available or for other reasons it may be desirable to test the network relays in the field on the protector These tests should be performed using a network protector test kit Expli...

Page 23: ...nds and the relays tested separately at 1500 volts AC for one second Field hipot test values are 75 percent of factory test values V THE REMOVABLE UNIT Figure 5 shows a typical removable unit for the 137NP network protectors The circuit breaker part of this unit is of the air break type and it utilizes arc quenchers for restricting and extinguishing the arc The details and arrangement of the main ...

Page 24: ...16 Figure 5 Removable Unit On Network Protector Stand ...

Page 25: ...17 Figure 6 Contact 800 to 1875 Amp Units Figure 7 Contact 2000 to 3500 Amp Units ...

Page 26: ...urfaces should always be kept clean and smooth After heavy short circuits they should be carefully inspected and if necessary any rough or high spots should be removed Use a fine clean file and wipe with a clean dry cloth When filing contacts remove the high spots only do not file to the bottom of deep pits Care should be taken to maintain a line contact as much as possible To check the amount of ...

Page 27: ...makes first and breaks last and two silver alloy contacts intermediate contacts make and break second The remainder of the bridging members have silver alloy contacts main contacts and these contacts make last and break first There are four silver allow contacts in the 2000 through 3500 ampere assembly With the breaker open the arcing contacts should be separated by a gap of 1 1 16 inches minimum ...

Page 28: ...the bottom end of the arcing contact bridging member 8 Loosen pivot screws B and the entire contact assembly can be lifted out as a unit 9 To replace the contact assembly reverse the above procedure D Assembly of 2000 through 3500 Ampere Contact Head Refer to Figure 8 1 Stack contacts and insulation with a 3 8 inch diameter pin in the location of Pin A This temporary pin should have a length less ...

Page 29: ...ivot 6144209 2 Add locking plate 3 Force locking plate against Pin B with some suitable lever in contact with Pin A to establish spring pressure for the hinge contact 4 Line up hole for 5 16 inch 18 hexagonal screw with screw driver in slot used for Pin E 5 A 5 16 inch 18 hexagonal screw and locking plate are required on each side Figure 9 Contact Head ...

Page 30: ...sed with a fine file It is not necessary to remove contacts to dress them however if necessary the movable contacts of this switch can easily be removed Remove the stud above the wire connection With the contact open push it towards the stationary contact and lift up The contact will lift out and can be repaired or replaced This operation can be done with the auxiliary switch in position on the br...

Page 31: ...connected to their respective locations circuits checked and the protector electrically operated to make sure all circuits are completed by the auxiliary switch Figure 10 Auxiliary Switch Figure 11 Rack and Gear Mechanism ...

Page 32: ...ng Sequence of Operation The sequence of operation of the 137NP network protectors may be best explained by consideration of the simplified control diagram by Figure 12 Assume that the breaker is open The sequence on closure is as follows 1 When the proper voltage conditions exist the relay will close its closing contacts 2 This action will energize the coil of the motor control device through the...

Page 33: ...he protector to its initial state When the breaker is closed or open an a or b switch will indicate the breaker position for customer use If the manual operating handle is moved to the open position the c switch will open the closing circuit to prevent closure of the protector Figure 12 Simplified Control Circuit ...

Page 34: ... two small cams for opening the contacts are staggered on the shaft such that either one or the other contact is always free to close The location of these cams on the shaft is such that the second contact is not opened until after the breaker is latched in the closed position Before either contact is opened during a closing operation the b switch has opened and has de energized the coil of the co...

Page 35: ...m frame will advance the motor cutoff point if turned counterclockwise If turned clockwise the motor cutoff point is retarded Before this adjustment can be changed the lock screw of the device and the lock nut on the adjusting screw must be loosened This adjustment will control the opening movement of the control device contacts The contacts must open far enough to be latched in the open position ...

Page 36: ... mechanism reset properly not only when tripped from the fully closed position but also after trip free operation Resetting of the latches after trip free operation should be checked by the following method Figures 14A B C Trip Mechanism ...

Page 37: ...g the main latch arm back into the reset position This again could be caused by binding or excessive friction resulting from dirt or other foreign material or by incorrect assembly if for any reason the mechanism has been taken apart b Adjustment of Tripping Solenoid Automatic tripping of the breaker is accomplished by energization of the coil of the tripping solenoid which is mounted on the right...

Page 38: ...30 Figure 15 Trip Solenoid Figure 16 Buffer Assembly ...

Page 39: ...n the buffer stops the trip resetting plunger should be bearing on the reset cam and holding the secondary latch in the reset position When in this position the trip resetting plunger should be just starting to compress its spring and move relative to the crosshead frame In no case should the spring behind the trip resetting plunger be compressed solid The complete trip mechanism may be removed as...

Page 40: ...hree units 1 brake assembly keyed to gear reducer 2 impeller keyed to motor shaft and 3 brake drum keyed in the gear housing When the motor is energized the impeller releases brake shoe from the brake drum and transmits torque directly to the gear reducer When the motor is de energized the motor torque on the impeller is released permitting the brake shoe to engage on brake drum and stop the mecha...

Page 41: ...d or attached can be removed by removing the three bolts holding the gear casing to the side of the mechanism frame and sliding the assembly off the end of the manual operating shaft N Manual Operation Manual operation of the breaker unit of the 137NP protectors is provided through a shaft concentric with the worm wheel and main closing cam shaft This shaft carries a cam which is similar to the ma...

Page 42: ...ctor see page iii is provided with a submersible enclosure All cases are provided with a cover which may be hinged from either side and an external manual operating handle which should always be mounted on the side opposite the cover hinges so as to be accessible when the cover is open If the enclosure is opened before the protector is mounted in its final location be sure to secure the top of the...

Page 43: ...ly part complete installation instructions together with an approved cement will be shipped with the material 2 Quick Opening Enclosure a Remove cover from box For flat spring type hinge remove four screws which secure hinge to front of cover On boxes with sliding bolt type hinge remove cover by removing cotter pins and washers which hold cover to hinge bolt b Place cover in horizontal position wi...

Page 44: ...aker unit coupling can also be located on either side of the manual shaft on the unit This coupling is secured to the shaft by means of a taper pin which can be removed The couplings on the case and breaker unit are so arranged that they will not engage when installing the breaker unit unless the breaker manual shaft and handle on case are in the open position When the handle is to be changed to t...

Page 45: ...curely for proper pressure seal and that the locking screws are securely fastened to bearing to prevent packing nut from turning C Packing Packing nut is adjusted at the factory to provide an airtight seal and further adjustment should not be necessary If however it is found necessary to tighten packing nut remove the handle and indicator back out locking screws of packing nut and turn packing nut...

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