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Powell PowlVac 38 ARM 3000A 4 Series Instruction Bulletin

Vacuum circuit breaker
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Instruction Bulletin - 01.4IB.65131
PowlVac 38™ ARM 3000A Series 4
Vacuum Circuit Breaker
38kV, 40kA, 3000A

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  • Page 1 DRAFT Powered by Safety ® Instruction Bulletin - 01.4IB.65131 PowlVac 38™ ARM 3000A Series 4 Vacuum Circuit Breaker 38kV, 40kA, 3000A...
  • Page 2 PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Contact Information Powell Electrical Systems, Inc. powellind.com info@powellind.com Service Division 7232 Airport Blvd Houston, Texas 77061 Tel: 1.800.480.7273 Powered by Safety ®...
  • Page 3 01.4IB.65131 Signal Words Qualified Person As stated in ANSI Z535.4-2007, the signal word is For the purposes of this manual, a qualified a word that calls attention to the safety sign and person, as stated in NFPA 70E®, is one who has designates a degree or level of hazard seriousness.
  • Page 4 PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker This page is intentionally left blank. Powered by Safety ®...

  • Page 5: Table Of Contents

    01.4IB.65131 Contents Ch 1 General Information ....................1 A. S ................................2 cope B. p ................................2 urpoSe c. I .....................2 nStructIon ulletInS vAIlABle lectronIcAlly D. A .........................2 SSocIAteD nStructIon ulletInS Ch 2 Safety ........................3 A. S ............................3 onDItIon B. S ...............................4 Afety uIDelIneS c.
  • Page 6 PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Contents Ch 4 Installation......................24 A. r ................................ 24 eceIvInG B. h ................................ 24 AnDlInG c. S ................................25 torAGe D. p ......................26 lAcInG the IrcuIt reAker ervIce 1) High Voltage Insulation Integrity ............................26 2) Vacuum Integrity ..................................27 3) Control Voltage Insulation Integrity ..........................29 4) Mechanical Operation Check ..............................29...
  • Page 7 01.4IB.65131 Contents Ch 6 Recommended Renewal Parts and Replacement Procedures .......52 A. o ............................. 52 rDerInG nStructIonS B. r ........................... 52 ecoMMenDeD eneWAl ArtS c. r ..........................52 eplAceMent roceDureS 1) Vacuum Interrupter Assembly .............................53 2) Closing Coil Assembly ................................53 3) Primary Shunt Trip Coil Assembly ............................53 4) Secondary Shunt Trip Coil Assembly ..........................53 5) Undervoltage Device Assembly (UV) ..........................53...
  • Page 8 PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Figures Figure 1 PowlVac 38™ ARM 3000A Series 4 Vacuum Circuit Breaker Front View with Cover ..................8 Figure 2 PowlVac 38™ ARM 3000A Series 4 Vacuum Circuit Breaker Front View No Cover ..................9 Figure 3 Close-Up View of the PowlVac 38™...
  • Page 9 01.4IB.65131 Tables Table A Field Dielectric Test Values ..................26 Table B Lubrication ......................41 Table C Timing ........................51 Table D Primary Resistance .....................51 Table E Primary Current Path ..................54 Table F Control Devices ....................55 Table G Miscellaneous Parts ....................57 Powered by Safety ®...
  • Page 10 PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker This page is intentionally left blank. Powered by Safety ®...

  • Page 11: Ch 1 General Information

    The information in this instruction bulletin is not intended to explain all details or variations of the Powell equipment, nor to provide for every possible contingency or hazard to be met in connection with installation, testing, operation, and maintenance of the equipment. For additional information and instructions for particular problems, which are not presented sufficiently for the user’s purposes, contact Powell at 1.800.480.7273.

  • Page 12: S Cope

    2. General descriptions of the operation and maintenance of the PowlVac 38 ARM Series For more information visit powellind.com. To 4 vacuum circuit breaker contact the Powell Service Division call 3. Instructions for installation and placing the 1.800.480.7273, or email circuit breaker into service info@powellservice.com.

  • Page 13: Ch 2 Safety

    01.4IB.65131 Ch 2 Safety N Exception No. 1: An adequately rated permanently mounted test device shall be A. S permitted to be used to verify the absence of onDItIon voltage of the conductors or circuit parts at The information in Section A is quoted from the work location, provided it meets the all NFPA 70E 2018 - Article 120, 120.5 Establishing an following requirements: (1) It is permanently...

  • Page 14: S Afety G Uidelines

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker B. S 8. Where the possibility of induced voltages Afety uIDelIneS or stored electrical energy exists, ground Study this instruction bulletin and all other the phase conductors or circuit parts associated documentation before uncrating before touching them.

  • Page 15: G Eneral

    DO vermin and insect infestations. NOT FORCE THE PARTS INTO POSITION. CONTACT POWELL FOR INSTRUCTIONS. D. S pecIfIc 1. DO NOT WORK ON AN ENERGIZED CIRCUIT BREAKER. If work must be...

  • Page 16: X-R Ays

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker e. X-r f. S Afety ABelS When high voltage is applied across the The equipment described in this document has DANGER, WARNING, CAUTION, and contacts of a vacuum interrupter, there is the possibility of generation of X-rays.

  • Page 17: Ch 3 Equipment Description

    The racking mechanism enerAl provides the motion to engage/disengage the primary disconnecting devices and to NOTICE open/close the shutters in metal-clad switchgear. Powell is committed to continuous product improvement. B. t toreD nerGy echAnISM It is possible that improvements occurred...

  • Page 18: Figure 1 Powlvac 38™ Arm 3000A Series 4 Vacuum Circuit Breaker Front View With Cover

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Figure 1 PowlVac 38™ ARM 3000A Series 4 Vacuum Circuit Breaker Front View with Cover a. Cover Bolts k. Secondary Disconnect Receptacle b. Handle MOC Actuator c. TOC Actuator m. Manual Trip Operator d.

  • Page 19: Figure 2 Powlvac 38™ Arm 3000A Series 4 Vacuum Circuit Breaker Front View No Cover

    01.4IB.65131 Figure 2 PowlVac 38™ ARM 3000A Series 4 Vacuum Circuit Breaker Front View No Cover a. Circuit Breaker Monitor (Optional) b. Anti-Pump Relay c. Emergency Racking Drive Shaft d. Racking Motor e. Opening Spring f. Main Closing Spring g. Connecting Rod h.

  • Page 20: Figure 3 Close-Up View Of The Powlvac 38™ Arm 3000A Series

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Figure 3 Close-Up View of the PowlVac 38™ ARM 3000A Series 4 Circuit Breaker Mechanism a. Primary Shunt Trip Coil m. Drive Pawl b. Secondary Trip Prop Adjusting n. Pawl Support Arm Screw o.

  • Page 21: Figure 4 Powlvac 38™ Arm 3000A Series 4 Vacuum Circuit Breaker Rear View With Barriers Removed

    01.4IB.65131 Figure 4 PowlVac 38™ ARM 3000A Series 4 Vacuum Circuit Breaker Rear View with Barriers Removed Note: The corona shields have been removed for clarity in this view. a. Lifting Hole k. Crank Arm Roller u. Contact Loading Spring b.
  • Page 22 PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker The mechanism employed in the circuit (Figure 3, f) located on the left front of breaker is a stored energy system which the mechanism. When the mechanism is uses a charging motor to compress the operated manually, the top pawl becomes main closing spring.

  • Page 23: Figure 5 Cam And Fundamental Linkage Positions

    01.4IB.65131 Figure 5 Cam and Fundamental Linkage Positions b) Breaker Closed - Spring Discharged a) Breaker Open - Spring Charged - Links Reset c) Breaker Open - Spring Discharged d) Breaker Closed - Spring Charged Powered by Safety ® Equipment Description...

  • Page 24: Figure 6 Mechanism And Trip Linkages

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Figure 6 Mechanism and Trip Linkages a. Secondary Trip Prop Adjusting Screw b. Secondary Trip Prop Shaft c. Secondary Trip Prop d. Secondary Linkage Roller e. Main Cam Roller f. Reset Spring g.
  • Page 25 01.4IB.65131 The camshaft would continue to rotate, weldment. Each bell crank is connected to except that it is restrained by the close an operating pin, which passes through a latch shaft (Figure 3, l). The main closing hole in the vertical push rod which engages cam, located between the mechanism an extension to the vacuum interrupter side sheets, is now in a position where the...

  • Page 26: Electrical Description

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker With the standard electrical control c. Anti-Pump Relay scheme, as soon as the main closing spring The anti-pump relay (Figure 2, is discharged on a closing operation, the provides a logic function for the control charging motor is switched on to recharge circuit which prevents a continuous the springs.

  • Page 27: General Description

    01.4IB.65131 e. Control Circuit c. A utoMAtIc AckInG echAnISM The typical electrical control scheme 1) General Description is shown in Figure 8. The control The racking mechanism is the mechanical scheme of any particular circuit breaker assembly that facilitates moving the may differ from this typical scheme circuit breaker between the breaker depending on the user’s requirements,...

  • Page 28: Figure 7 Operation Sequence

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Figure 7 Operation Sequence Secondary Disconnect Makes Motor “M” Green Light Energized Energized Close Spring Charged Makes Breaks Breaks Makes Makes White Light Motor “M” “Y” Circuit Energized Deenergized Disabled Close Control “CS/C”...

  • Page 29: Figure 8 Typical Control Scheme

    01.4IB.65131 Figure 8 Typical Control Scheme (optional, but no UV) (optional, but no TC2) (ARM/G only) CLOSE TRIP1 TRIP2 ARM/G ONLY NON-ARM/G 125VDC Secondary Disconnect HE SENSOR TO CBM HE DEVICE IDs LS = SPRING CHARGE LIMIT SWITCH (SHOWN W/SPRING DISCHARGED) LCS = LATCH CHECK SWITCH (SHOWN W/SPRING DISCHARGED) Y = ANTI-PUMP RELAY TC = BREAKER TRIP COIL...
  • Page 30 PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker b. Interlocking Racking the circuit breaker in from the test/disconnected position to the PowlVac 38™ ARM Series 4 circuit connected position also rotates the breakers are provided with several interlock cam attached to the racking interlocks that operate in conjunction shaft.

  • Page 31: Racking Mechanism

    01.4IB.65131 c. Blocking Interlock Automated racking operations are monitored and controlled through current Access to the emergency racking drive sensing of the motor circuit. The motor is controlled by a blocking interlock. halts the racking operation when it The emergency racking access shutter encounters the stop bolts.

  • Page 32: Secondary Disconnecting Devices

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker 2) Secondary Disconnecting Devices 5) Ground Connection Control power is transferred from the The ground connection (Figure 4, ab) is metal-clad switchgear to the circuit breaker an assembly of spring loaded fingers that by means of the secondary disconnect grounds the circuit breaker frame as it device.

  • Page 33: Acuum I Nterrupters

    01.4IB.65131 e. v AcuuM nterrupterS PowlVac 38™ ARM Series 4 circuit breakers utilize sealed vacuum interrupters to control the primary circuit. Some vacuum interrupters appear to be identical in size and shape externally, but types vary in rating due to the differences in their internal construction.

  • Page 34: Ch 4 Installation

    Powell representative. assembly. The fifth wheel assembly allows for Estimated size and weight for shipping a easy maneuverability of the circuit breaker PowlVac 38™...

  • Page 35: S Torage

    01.4IB.65131 Figure 10 Circuit Breaker on Crane controlling desiccant materials should be utilized when space heaters are not provided or cannot be energized. The temperature should be kept above 33°F/1°C and below 140°F/60°C. The relative humidity should be kept below 60% or a dew point of 15°C/59°F.

  • Page 36: P Lacing The C Ircuit B Reaker I Nto S Ervice

    Before shipment from the factory, all circuit breaker functions are thoroughly checked. The If DC high potential testing is performed, the DC user must verify functions after receipt. Powell high potential test machine must NOT produce recommends that the tests be performed in the instantaneous peak voltages exceeding 85kV.

  • Page 37: Vacuum Integrity

    The tests described in this section are the Powell recommends AC testing for reliable only tests required to ascertain insulation verification of vacuum integrity. All integrity. Because of the design of the PowlVac 38™...
  • Page 38 PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Powell recognizes the widespread use CAUTION of DC hipot equipment in the field and the desire to use this equipment to verify If DC high potential testing (hipot) for vacuum vacuum integrity.

  • Page 39: Control Voltage Insulation Integrity

    01.4IB.65131 3) Control Voltage Insulation Integrity inserting the secondary disconnect override device in the secondary If the user wishes to check the insulation disconnect receptacle. This device must be integrity of the control circuit, it may be removed after testing and before the circuit done with a 500V or 1000V insulation breaker is inserted into the compartment.

  • Page 40: Electrical Operation Check

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker 5) Electrical Operation Check Alternatively, a test jumper cable may be used to electrically operate the circuit To check the basic electrical operation breaker using the control circuitry of the of the circuit breaker, a circuit breaker circuit breaker compartment.

  • Page 41: Emergency Racking Mechanism Check

    01.4IB.65131 6) Emergency Racking Mechanism Check Once again depress the racking drive shaft shutter, insert the racking handle onto the The emergency racking mechanism must racking drive shaft and rotate in a clockwise be checked outside the circuit breaker direction until the racking crank arms are compartment.

  • Page 42: Prior To Inserting The Circuit Breaker Into The Circuit Breaker Compartment

    Contact position. Powell for further information. NOTICE Examine the circuit breaker compartment to see that it is clean and clear of debris that might interfere with The illustrations shown for all racking circuit breaker travel.

  • Page 43: Inserting The Circuit Breaker To The Test/Disconnect Position

    01.4IB.65131 2) Inserting the Circuit Breaker to the c. Roll the circuit breaker into the Test/Disconnect Position compartment until the position interlock bar and roller contacts a positive stop. CAUTION Note: This is the Disconnect Position. Prior to inserting the circuit breaker into the circuit breaker compartment, make sure that Figure 12 Secondary Disconnecting Device...

  • Page 44: Inserting The Circuit Breaker To The Connected Position

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker e. Roll the circuit breaker into the NOTICE compartment until the racking crank arms make contact with the vertical In the event of an emergency, such as loss slots in the compartment. of control power, the ARM circuit breaker The anti-rollout latch on the right side is equipped with an emergency racking...

  • Page 45: R Emoving The C Ircuit B Reaker From The C Ircuit B Reaker C Ompartment

    01.4IB.65131 c. Turning the racking handle d. Once the circuit breaker has reached counterclockwise will begin to rack the the connected position, remove the circuit breaker into the compartment. racking handle, visually verify that the When the circuit breaker is racked into emergency racking drive shaft shutter the compartment, the force needed has returned to its normal position,...

  • Page 46: Removing The Circuit Breaker From The Test/Disconnected Position Out Of The Circuit Breaker Compartment

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker 2) Removing the Circuit Breaker from the 3) Emergency Racking Out Procedure Test/Disconnected Position out of the Circuit Breaker Compartment WARNING CAUTION To perform this action the circuit breaker compartment door must be open. If the equipment is energized at this time, the Prior to removing the circuit breaker from the operator is exposed to potentially lethal...
  • Page 47 01.4IB.65131 b. To remove the circuit breaker from the CAUTION Test position out of the circuit breaker compartment perform the following: Prior to removing the circuit breaker from the circuit breaker compartment, make sure that 1. Push the secondary disconnect latch the control circuits are deenergized.

  • Page 48: Ch 5 Maintenance

    A permanent record of all maintenance and/or not fully understood, contact Powell work should be kept, the degree of detail immediately. depending upon the operating conditions.

  • Page 49: Inspection And Cleaning

    01.4IB.65131 Because of extensive quality control tests Primary insulation, including the vacuum made at the factory, the operations counter interrupter supports and the operating on a new circuit breaker will normally pushrods, should be cleaned. Wipe clean register over a hundred operations. The with a dry lint-free cloth or an industrial reading of the operations counter should type wiper.

  • Page 50: Lubrication

    Before applying any type of lubrication to the circuit breaker, the stored energy mechanism should be in the open position, and all springs should be discharged. Powell offers a complete lubrication kit (Powlube-104) which contains all the lubricants required for maintaining the circuit breakers. Powlube-104 consists of (1) A-grease, (1) B-grease, and (1) C-oil.
  • Page 51 01.4IB.65131 Table B Lubrication Reference Location Lubricant Method Figure Electrical Parts Primary Disconnecting Device Figure 13, a B - Grease Wipe clean. Apply lubricant only to actual contact surface. Ground Connection Figure 14, t B - Grease Wipe clean. Apply lubricant only to actual contact surface. Secondary Disconnect Receptacle Figure 13, d B - Grease Wipe clean.

  • Page 52: Figure 13 Lubrication

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Figure 13 Lubrication Primary b. Main Closing Disconnecting Spring Guide Device d. Secondary Spring Yoke Pin Disconnect Receptacle Trip Shaft Bearing Fundamental g. Jackshaft Support h. Pawl Support Arm Crank Pin Linkage Pin n.

  • Page 53: Figure 14 Lubrication (Cont)

    01.4IB.65131 Figure 14 Lubrication (cont) p. Fundamental Racking Linkage Mechanism q. Primary Trip Flag Support Prop Open-Closed Flag Ground Motor Cutoff w. Close Shaft Jackshaft Outer Drive Lever Pin at Connection Support Bearing Bearings Support Jackshaft Camshaft Motor Drive Motor Drive Shaft aa.

  • Page 54: Closing Spring Removal

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Figure 16 Main Closing Spring Assembly 3) Closing Spring Removal Installed The closing spring must be removed in order to perform slow closing of mechanism. Although main closing spring removal is not necessary for lubrication, it may be necessary for performing adjustments or major overhaul tasks.

  • Page 55: Slow Closing Of Mechanism

    01.4IB.65131 7. With a slight rocking motion of the main 5) Mechanism Adjustments closing spring assembly, the connecting rods (Figure 15, e) can now be unhooked WARNING from the spring yoke pins and the main closing spring assembly can be When any maintenance procedure requires removed.

  • Page 56: Figure 17 Primary & Secondary Trip Prop Adjustment

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker To adjust the pawl perform the b. Adjustment of Primary and Secondary following steps: Trip Prop Figure 17 Primary & Secondary Trip Prop 1. Remove the escutcheon to gain Adjustment access to the head of the bolt holding the adjusting eccentric.

  • Page 57: Figure 18 Feeler Gauge

    01.4IB.65131 c. Tripping System Adjustment position of the too used to turn the adjusting screw at the moment the breaker operates. Do NOT turn the WARNING screw any further clockwise after the breaker operates. Prior to adjustments, servicing, maintenance, 7. Turn the secondary trip prop or any act requiring the operator to make adjusting screw counterclockwise physical contact with the equipment, the...

  • Page 58: Figure 19 Latch Check Switch Adjustment

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Note: Do NOT tilt the armature. Tilting the 16. Repeat steps 9 through 15 until armature by applying a load to the the breaker does not trip with the right of the feeler gauges will produce 0.090”...
  • Page 59 01.4IB.65131 To adjust the latch check switch perform 6. Depress the manual close operator the following steps: and rotate the crank arm until resistance is felt. 1. Remove the main closing spring 7. Depress and hold the manual trip Refer to Ch 5 Maintenance, operator inward and rotate the B.

  • Page 60: Electrical Operation

    Each new vacuum interrupter is set the vacuum interrupter it should only be with a gap of about 1/4” to 5/8” between done by a qualified technician or a Powell the contact loading spring yoke and the service technician. Contact Powell for lock nut on the operating pushrod stud.

  • Page 61: O Ptional Maintenance P Rocedures

    01.4IB.65131 D. o 3) Primary Resistance Check ptIonAl AIntenAnce roceDureS 1) High Potential Tests This check is not required for routine maintenance but it is recommended after High potential tests are not required for any major maintenance that requires routine maintenance but are recommended disassembly of any part of the primary after a heavy fault interruption, any major current path.
  • Page 62 The recommended quantity is not specified. This must be determined 1. Order Renewal Parts from Powell at by the user based on the application. As a powellind.com or call 1.800.480.7273. minimum, it is recommended that one set of 2.
  • Page 63 Check Switch Assembly & Tripping System Mechanism Adjustment for replacement and The vacuum interrupter should only be installation procedures. replaced by a qualified person or a Powell Service technician. Contact Powell for further 9) Motor Cutoff Switch Assembly assistance at 1.800.480.7273.

  • Page 64: Figure 20 Primary Current Path

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Table E Primary Current Path Rated Primary Breaker Type Rated Operating Pushrod Continuous Disconnecting Vacuum Interrupter k factor = 1 Assembly Current Device 38PV40ARMM-4 3000A 62201P32 150-36090B 29292G00000107 38PV40ARMX-4 3000A 62201P32 150-36090B 29292G00000107...

  • Page 65: Table F Control Devices

    01.4IB.65131 Table F Control Devices Primary Shunt Trip Coil Secondary Undervoltage Charging Control Assembly (2) Shunt Trip Anti-Pump Relay Closing Coil Device Motor Voltage Coil Assembly Assembly Assembly (4) Assembly 3-Cycle 5-Cycle 24VDC 50027G05 50041G08 50042G06 48VDC 50027G01 50041G01 50042G01 50960G06 RR2BA-US-DC48V 50026G01...

  • Page 66: Figure 21 Control Devices

    PowlVac 38™ ARM 3000A Series 4 01.4IB.65131 Vacuum Circuit Breaker Figure 21 Control Devices a. Primary Shunt Trip Coil (3 cycle) b. Primary Shunt Trip Coil (5 cycle) c. Charging Motor Assembly d. Closing Coil Assembly e. Anti-Pump Relay f. Racking Motor Powered by Safety ®...

  • Page 67: Table G Miscellaneous Parts

    01.4IB.65131 Table G Miscellaneous Parts Description Catalog Number Illustration Auxiliary Switch 102112PB Ground Connection 40767G10 Latch Check Switch BA-2RV2-A2 Motor Cutoff Switch Assembly 50756G03 PowlVac® Hardware Kit 60500G24 PowlVac® Lubrication Kit Powlube-104 Secondary Disconnect Override Device 51702G32 Fifth Wheel Assembly 49491G00005029 Powered by Safety ®...
  • Page 68 Vacuum Circuit Breaker 38kV, 40kA, 3000A June 2019 Powered by Safety ® Powell Electrical Systems, Inc. Tel: 1.800.480.7273 Service Division - Houston powellind.com 7232 Airport Blvd • Houston, TX • 77061 info@powellind.com ©2006 Powell Industries, Inc. • All rights reserved.

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