1 General Provisions
1.0.1 This code was formulated with a view to unify the specifications of instrument power supply design for chemical industry, to promote normalization of instrument power supply engineering design, and to achieve the purpose of advanced technology, economic feasibility, safety and usability.
1.0.2 This code is applicable to the power supply design of measuring and control instrument of chemical plant.
1.0.3 Besides the provisions stipulated in this code, instrument power supply design code shall be in accordance with the requirements of current national standards.
2 Terms and Abbreviations
2.1 Terms
2.1.1 Instrument power supply
DC or AC power supply for measuring and control instruments.
2.1.2 Uninterrupted power supply
Power supply can be continuous a certain serving time after interruption of external power supply, which can be divided into AC uninterrupted power supply and DC uninterrupted power supply.
2.1.3 General power supply
No delay power supply without battery-backed system.
2.1.4 Momentary power failure
The time for momentary interruption of power supply.
2.1.5 Power capacity
Rated value for power output of power supply. Generally, AC power capacity expressed in voltamperes or kilovoltamperes, DC power capacity expressed in emetes of output current.
2.2 Abbreviations
CCS — Compressor Control System
DCS — Distributed Control System
FCS — Fieldbus Control System
PLC — Programmable Logic Controller
SIS — Safety Instrumented System
UPS — Uninterrupted Power Supply
3 Instrument Power Supply Scope, Load Level and Type of Power Supply
3.1 Power supply scope
1 General Provisions
2 Terms and Abbreviations
2.1 Terms
2.2 Abbreviations
3 Instrument Power Supply Scope, Load Level and Type of Power Supply
3.1 Power supply scope
3.2 Load level and type of power supply
4 Instrument Power Supply Quality and Capacity
4.1 General power supply quality
4.2 Uninterrupted power supply quality
4.3 Power capacity
5 Instrument Power Supply Configuration Requirements
5.1 Power supply configuration principle
5.2 General power supply
5.3 Uninterrupted power supply
6 Power Supply System Design and Design Conditions
6.1 Power supply system design principles
6.2 Power supply system distribution
6.3 Power supply system design conditions
7 Power Supply Device Selection
7.1 AC uninterruptible power supply
7.2 DC power supply and DC uninterrupted power supply
8 Selection of Power Supply Equipment
8.1 General principles for selection of electrical equipment
8.2 Selection of Fuse and Breaker
8.3 Equipment Installation
9 Power Supply System Wiring
9.1 Wiring
9.2 Wire sectional area
Explanation of Wording in This Code
List of Quoted Standards
