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CALCULATION OF FAULT CURRENTS IN THREE-PHASE AC POWER SYSTEMS (APPLICATION GUIDE TO ENGINEERING RECOMMENDATION G74)
European Telecommunications Standards Institute
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Availability date: 11/06/2021
Foreword
1 Scope
2 References
3 Definitions and abbreviations
3.1 Definitions
3.2 Abbreviations
4 Applicability of services
5 Realisation of service
6 Other users perception of the open channel operation
6.1 Single timeslot open channel operation
6.2 Distinction between group call and circuit mode data
7 Optimisation of the call set-up protocol
7.1 Definition of performance parameters
8 Optimisation of the supplementary services involved at the
set-up
8.1 Definition of performance parameters
9 System performance parameters
9.1 Modelling of the air interface protocol
10 Composition of annexes
Annex A (informative): Group voice call scenarios (TETRA 03.52)
A.1 Procedures for message trunked systems
A.2 Procedures for transmission trunked systems
A.3 Procedures for quasi-transmission trunked systems
Annex B (informative): Supplementary Service stage 1: Access
Priority (SS-AP) (TETRA 03.69)
B.1 Scope
B.2 Normative references
B.3 Definitions and abbreviations (TETRA 01.04)
B.4 Supplementary Service Access Priority (SS-AP)
Stage 1 specification
Annex C (informative): Supplementary Service stage 1:
Priority Call (SS-PC) (TETRA 03.70)
C.1 Scope
C.2 Normative references
C.3 Definitions, symbols and abbreviations (if any)
C.4 Supplementary Service Priority Call (SS-PC)
Stage 1 specification
Annex D (informative): Supplementary Service stage 1:
Pre-emptive Priority Call (SS-PPC) (TETRA 03.76)
D.1 Scope
D.2 Normative references
D.3 Definitions and abbreviations (TETRA 01.04)
D.4 Supplementary Service Pre-emptive Priority Call
(SS-PPC) Stage 1 specification
Annex E (informative): Supplementary Service stage 1: Call
Retention (SS-CRT) (TETRA 03.85)
E.1 Scope
E.2 Normative references
E.3 Definitions and abbreviations
E.4 Supplementary Service Call Retention (SS-CRT)
stage 1 specification
Annex F (informative): Supplementary Service stage 1: Call
Authorized by Dispatcher (SS-CAD) (TETRA 03.66)
F.1 Scope
F.2 Normative references
F.3 Definitions and abbreviations (TETRA 01.04)
F.4 Supplementary Service Call Authorized by Dispatcher
(SS-CAD) Stage 1 specification
Annex G (informative): Supplementary Service stage 1: Late
Entry (SS-LE) (TETRA 03.74)
G.1 Scope
G.2 Normative references
G.3 Definitions and abbreviations (TETRA 01.04)
G.4 Supplementary Service Late Entry (SS-LE)
Stage 1 specification
Annex H (informative): Supplementary Service stage 1: Dynamic
Group Number Assignment (SS-DGNA) (TETRA 03.83)
H.1 Scope
H.2 Normative references
H.3 Definitions and abbreviations (TETRA 01.04)
H.4 Supplementary Service Dynamic Group Number
Assignment (SS-DGNA) Stage 1 specification
Annex J (informative): Supplementary Service stage 1:
Transfer of Control (SS-TC) (TETRA 03.75)
J.1 Scope
J.2 Normative references
J.3 Definitions and abbreviations (TETRA 01.04)
J.4 Supplementary Service Transfer of Control (SS-TC)
Stage 1 specification
History
Prepared to assist Electricity staff engaged in applying Engineering Recommendation G74 to evaluate short circuit current in transmission and distribution networks and in generating station auxiliary systems. Aim is to provide practical guidance through the provision of worked examples for typical networks highlighting where necessary the key features of the methodology and implications of the results on circuit breaker duties. Guidance on the fault infeed from induction motors is included.
Published | |
Document Type | Standard |
Status | Current |
Publisher | European Telecommunications Standards Institute |
Pages | |
ISBN | |
Committee | TETRA |