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Alstom MBCH User Manual
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Ser
vice Manual
T
ype MBCH
Biased Differential Relay
2
Table of Contents
Default Chapter
3
Handling of Electronic Equipment
3
Table of Contents
4
Safety Section
7
Health and Safety
7
Explanation of Symbols and Labels
7
Equipment Connections
7
Equipment Operating Conditions
8
Current Transformer Circuits
8
External Resistors
8
Battery Replacement
8
Older Products
9
Electrical Adjustments
9
Mechanical Adjustments
9
Insertion and Withdrawal of Extender Cards
9
Technical Specifications
10
Protective Fuse Rating
10
Description
11
Installation
11
General
11
Unpacking
12
Storage
12
Site
12
Commissioning Preliminaries
12
Inspection
13
Wiring
13
Earthing
13
Insulation
13
Commissioning Tests
13
DC Auxiliary Supply
14
Relay Settings
14
Bias Check
15
MBCH 13 Only
15
MBCH 16 Only
15
Operating Time
15
Bias Interconnection
16
Circuit Breaker Tripping
16
Magnetizing Inrush Test
16
On Load Tests
16
Application Notes
17
General
17
Matched Line Current Transformers
17
Ratio and Phase Matching Interposing Transformers
18
Details of Matching Transformers
18
Notes on Combinations of Windings
18
Application of Matching Transformer
19
Single Phase Transformer
19
Three Phase Transformer with Unmatched Current Transformers
19
500Kv Winding
20
Three Winding Transformer
20
138Kv Winding
21
13.45Kv Winding
22
Settings
23
Flowchart 1
24
MBCH 12/13/16 Bias Curve
32
Three Winding Transformer – One Power Source
35
Switchgear Arrangement Where Six Bias Inputs May be Required
36
Commissioning Test Record
45
Repair Form
47
4
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Alstom MBCH Specifications
General
Gas Accumulation Detection
Yes
Oil Level Drop Detection
Yes
Frequency
50/60 Hz
Test Facility
Yes
Protection Functions
Buchholz protection
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