Richards 137NP Instruction Manual

Network protector, 800 to 3500 amperes

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Network Protector Instruction

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

Manual

Type 137NP

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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 3 Richards Mfg. Co. shall not be liable for any loss or damage, directly or indirectly, arising out of the use of equipment or parts (including software) or for any consequential damages, including but not limited to, any claims for buyer’s lost profits or for any claim or demand against the...
Page 4 All applicable safety procedures should be adhered to when installing, maintaining, or operating network protectors. Only qualified electrical personnel should be permitted to work on 137NP Network Protectors. De-energized and rack out the network protector mechanism before any maintenance procedure.
Page 5 Submersible Transformer Mounted...
Page 7: Table Of Contents
TABLE OF CONTENTS PAGE I. OVERVIEW A. Introduction B. 137NP Submersible Network Protector C. 137NP Non-Submersible Network Protector II. INSTALLATION A. Receiving, Handling and Storage B. Transformer Mounted C. Separately Mounted D. Opening Enclosures E. Removing the Breaker Unit F. Connections G.
Page 8 H. Operating Mechanism I. Motor Control Device J. Trip Mechanism K. Operating Motor L. Torque Brake M. Gear Assembly N. Manual Operation O. Manual Cutoff Switch P. Closing Linkage VI. THE ENCLOSURE A. Cover Gasket Replacement B. Changing Location of Operating Handle C.
Page 9: Overview
The cover is sealed to the case with gaskets compressed by clamping strips and bolts. There are two general styles of 137NP network protectors; one with the protector arranged for wall or framework mounting independently of the network transformer, “Separately Mounted”, and the other for bolting on to a three phase network transformer, “Transformer...
Page 10: 137Np Non-Submersible Network Protector
C. 137NP Non-Submersible Network Protectors The non-submersible 137NP network protectors are generally similar to the submersible except that non-submersible enclosures are provided. These protector units are for applications in clear dry vaults. Equipment mounted enclosures (open framework) protectors are also available.
Page 11: Transformer Mounted
lower terminals when these protectors are set upright on the floor. These feet may be removed, when these protectors are bolted in position, to provide clearance for making cable connections. Equipment-mounted protectors will not stand unsupported on the floor. When handling or resting these protectors on the floor, be careful not to damage the lower barriers or terminals and, if necessary, place a block under the channel framework If the protectors are not to be used for some time, store in the packaging in which received.
Page 12: Opening Enclosures
D. Opening Enclosures Before opening the enclosure, submersible and non-submersible protectors should be mounted in their final locations or if to be temporarily supported they must be securely anchored by the lifting eyes to a firm post or part of a building to keep the protector from tipping forward.
Page 13 3. Equipment Mounted Protectors The breaker 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 Figure 2 – Removable Unit Supported From Lifting Eyes...
Page 15: Connections
F. Connections Cable connections should not be made until after fuses have been removed from protector. Do not replace fuses until all tests and checks outlined under INSPECTION AND TESTING have been made. G. Relay Installation After the protector has been installed either permanently or temporarily for testing, the network protector relay may be installed in the protector.
Page 16: Maintenance
III. MAINTENANCE A regular inspection and maintenance schedule for network protectors is recommended. While experience will best indicate the frequency with which inspections should be made, the following routine is suggested. In all cases open the protector manually and lock in the open position first, then remove fuses and the test caps before working on or inspecting or testing protector.
Page 17 7. Yearly Fully inspect and test protectors including relays and perform the following preventive maintenance. a. Remove breaker from the enclosure and inspect and clean the contacts. b. Check wiring terminals for tightness. c. Remove trip mechanism and inspect and clean mechanism if necessary. The protector mechanism is thoroughly lubricated at the factory and this lubrication should last for some time.
Page 18: Inspection And Testing
IV. INSPECTION AND TESTING CAUTION: DO NOT OPERATE THE PROTECTOR, EITHER MANUALLY OR ELECTRICALLY, UNLESS IT IS IN A VERTICAL POSITION. Before placing the protector in service it should be tested. Tests may be made with protector in its final location or with the protector in a temporary location in the service shop. If temporarily located be sure to secure the protector as described under Receiving, Handling and Storage.
Page 19: Phasing
A. Phasing Phase out connections to protector to insure that “cross-phase” connection will not be made when the breaker is closed. Network voltage is available on network side of fuse mounting. Transformer voltage is available on opposite end of fuse mounting when the protector is closed.
Page 20: Eti Mnpr® Microprocessor Relays
phase sequence provided four leads are interchanged in accordance with the wiring diagram). 6. Return the phasing relay connections to normal. 7. Remove test caps B, C, and F for the following tests. D. ETI MNPR® Microprocessor Network Protector Relays The relay will not close its contacts on a crossed phase system.
Page 21: Checking The Minimum Tripping Voltage
Figure 4 shows a test set up for obtaining the various voltages required for testing the protector mechanism. The variable auto-transformer should have inputs of 208 and 460 volts with a 16 amp current rating. Figure 4 – Single Phase Test Circuit F.
Page 22: Checking The Motor Control Device
H. Checking the Motor Control Device Using the test set ups as previously described apply the following voltage levels to the protector control circuits. 1. For 125/216V units. The motor control device should never pick up at 166 volts and should always pick up at 180 volts.
Page 23: The Removable Unit
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.
Page 24 Figure 5 – Removable Unit On Network Protector Stand...
Page 25 Figure 6 – Contact 800 to 1875 Amp Units Figure 7 – Contact 2000 to 3500 Amp Units...
Page 26: Contact Construction 800 Through 1875 Ampere Protectors
B. Contact Construction for 800 through 1875 Ampere Protectors Each breaker pole has a set of main current-carrying contacts and a set of arcing contacts (see Figure 6). The main current-carrying contacts consist of pieces of silver-alloy brazed to the contact bars and to a bridging block.
Page 27: Contact Construction 2000 Through 3500 Ampere Protectors
3. Block the breaker in the closed position to prevent accidental tripping. This can be done by wedging a block of wood between the cross head and the trip mechanism frame. 4. Remove the two stop screws with lock washers on the sides of the contact bridging member.
Page 28: Assembly Of 2000 Through 3500 Ampere Contact Head
contacts make sure that all screws are tight and that the locking plates are bent back around the screw heads. Replacement of the bridging contact members under normal circumstances should be unnecessary. However, if required, the following procedure is suggested (see Figure 7): 1.
Page 29 Figure 8 – Contact Head Refer to Figure 9 1. The contact head is assembled to the cross bar with Pin “E” and to the stationary copper, hinge contact with pivot 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.
Page 30: Current Transformers
E. Current Transformers One current transformer, for use with the network relay, surrounds and is mounted on each pole of the breaker unit. Each current transformer has two windings; the phasing winding which is energized when the breaker contacts are open by the voltage across the breaker contacts and a secondary winding which is connected to the network relay current coils.
Page 31 wired should be 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: Mechanical Indicator
H. Operating Mechanism The mechanism for closing the breaker of the 137NP network protectors is of the gear-driven cam, motor operated type. (see Figure 5). The operating motor is mounted on the worm and gear housing to the left of the closing linkage. The motor drives the worm through a torque brake which permits free running of the motor while torque is being transmitted from the motor to the worm, and serves to stop the motor’s rotation immediately when the motor is...
Page 33 3. When this occurs, the “a” switch will open, de-energizing the trip coil, and the “b” switch will close, restoring the 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.
Page 34: Motor Control Device
Figure 13 – Motor Control Device I. Motor Control Device The motor control device is mounted in the lower left-hand side of the closing mechanism assembly (see Figure 2). This device (see Figure 13) performs the necessary functions of energizing the motor when the closing contacts on the relays close, and of de-energizing the 0motor after the breaker is completely closed.
Page 35: Trip Mechanism
J. Trip Mechanism The trip mechanism in use on 137NP network protectors is self-resetting (see Figure 14A, B, C). Rotation of the latch shaft permits the latch to rotate about its pivot, releasing the latch roller and allowing the breaker toggle linkage to collapse.
Page 36 It is essential that the breaker 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 With the operating handle in the automatic position hold up the hand-trip finger (see Figure 15) such that the secondary latch is disengaged. Then energize the motor closing circuit at 230 volts (106 percent) and after two or three trip-free operations release the hand-trip finger.
Page 38 Figure 15 – Trip Solenoid Figure 16 – Buffer Assembly...
Page 39: Operating Motor
c. Replacement of Buffer Washers The shock of the breaker opening is deadened by two buffer stops, one on either side of the mechanism assembly. The buffer washer used on these stops are made of a material which combines the necessary shock-absorbing qualities with long life and durability, and they should be replaced only by similar washers of the same material obtained from the factory.
Page 40: Torque Brake
Operating motors may be removed by disconnecting the leads from the terminals provided, removing the three bolts holding the motor to the gear housing, and lifting the motor vertically. Figure 17 – Motor, Torque Brake and Gear Reducer L. Torque Brake The torque brake (see Figure 17) applied between the motor and the gear reducer unit serves as a coupling and controls the over travel of the motor closing cam when the motor is de- energized.
Page 41: Gear Assembly
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...
Page 42: Manual Cutoff Switch
CAUTION: Breaker must first be open. VI. THE ENCLOSURE The 137NP network protector (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.
Page 43: Cover Gasket Replacement
After sealing the enclosure, all submersible protectors should be given an air pressure test. Any satisfactory air or nitrogen testing equipment may be used. Inflate the case with gas to not more than six pounds per square inch leave the pressure in the case for 24 hours. The pressure drop should not be more than two pounds.
Page 44: Changing Location Of Operating Handle
marks. Wipe the hand cream from the exposed gasket surface and apply talc to keep the gasket from sticking to the housing. f. Reassemble cover on the housing by following above procedure in the reverse order. Figure 19 – Door with Gasket B.
Page 45: Packing
The pin holding coupling to the operating shaft is shown for right side of the enclosure mounting. When operating handle is mounted on left side of the enclosure the pin is inserted in the hole of the coupling opposite to that shown. If the packing removed from original bearing is in good condition, assemble in the new bearing making sure that packing nut is drawn against the packing securely for proper pressure seal and that the locking screws are securely fastened to bearing to prevent packing...