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VHK 20
ABB VHK 20 User Manual
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IB 6.2.7.7-3I
Rev. 0, J
an-99
INSTALLATION/MAINTENANCE INSTRUCTIONS
Medium Voltage
Vacuum Power Circuit Breakers
VHK Model 20/21
VHKR Model 80
Model
21
A
BB Pow
er T&D Company, Inc.
Distribution Sy
stems Division
MM
2
Table of Contents
Default Chapter
2
Table of Contents
2
Introduction
4
Receiving and Storage
4
Installation
4
General
4
General Inspection
5
Vacuum Interrupter Examination
5
Barrier and Insulation Inspection
5
Installing Front Barrier
5
Manual Operation for Inspection
5
Padlock Provision
6
Interlocks
6
Installing Circuit Breaker into Compartment
8
Circuit Breaker Removal - Model 21
8
Removal from Connect Position
8
Removal from Test Position
9
Removal from Disconnect Position
9
Safe Operations Recommendations
9
Adjustments, Tests and Periodic Maintenance
9
Insulation Cleaning
10
DC Millivolt Drop Test / Micro-Ohm Test
10
Contact Wear and Contact Pressure
10
Contact Gap
10
Contact Gap Check
11
Contact Sequencing
11
Closing and Opening Times
12
Closing and Opening Speeds
12
Operating Mechanism
12
Trip Latch Engagement (Bite)
13
Control Device
13
Lubrication
13
Dielectric Tests
13
Electrical Characteristics of Control Devices
15
DC and Ac Closing Operating Sequence
15
Ac Closing Operating Sequence
15
Ground and Test Devices
17
Renewal Parts
17
Appendix
18
Igure A1
18
Ifting Yoke Installed
18
Circuit
18
Breaker Assembly with L Breaker Rear - Model 21
19
Odel 21
20
Odel 30
21
Operated Circuit Breakers
22
Circuit Breaker Panel - M Circuit Breaker Panel - M Charging of Electrically Acking Mechanism & Interlocks
23
Ontrol Device Adjustment
28
Circuit
30
Range
31
Alues
31
Ontrol Circuit Operating Voltage Ontrol Circuit Typical Current Vperating Parameters
32
4
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ABB VHK 20 Specifications
General
Rated current (In)
20 A
Mounting type
DIN rail
Poles
3
Number of poles
3
Mechanical life
20000 cycles
Electrical life
10000 cycles
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