DL/T 5428-2009 英文版 火力发电厂热工保护系统设计技术规定

ICS 27.100
K 54
Record No. J926—2009
Electric Power Industry Standard of the People's Republic of China
P DL / T 5428 — 2009
Technical Code for Design of I&C
Protection System in Fossil Fuel
Power Plant
Issue Date: July 22, 2009 implementation Date: December 1, 2009
Issued by the National Energy Administration of the People's Republic of China

1 Scope
This code specifies the design principles and design methods that shall be followed in power supply, logic and protection system configuration as well as equipment part of protection system in fossil fuel power plant.
This code is applicable to the design of new construction, expansion and betterment projects for condensing fossil fuel power plants with steam turbine generator unit rated 125MW- 1000MW, as well as the design of thermal power plants with capacity of 50MW and above.

2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this code. For dated references, subsequent amendments (excluding the contents of errata) to, or revision of, any of these publications do not apply.
However, parties to agreements based on this code are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 5578—2007 Fixed Power Plant Turbine Specifications
GB/T 13399—1992 Specification for S team Turbine Safety Monitoring Devices
GB/T 13983—1992 Instruments—Vocabulary—Basic Terms
GB/T 17626.2—2006 Electromagnetic Compatibility—Testing and Measurement Techniques—Electrostatic Discharge Immunity Test
GB/T 17626.3—2006 Electromagnetic Compatibility—Testing and Measurement Techniques—Radiated Radio-Frequency Electromagnetic Field Immunity Test
GB/T 17626.4—2008 Electromagnetic Compatibility—Testing and Measurement Techniques—Electrical Fast Transient/Burst Immunity Test
GB/T 17626.5—2008 Electromagnetic Compatibility—Testing and Measurement Techniques—Surge Immunity Test
GB/T 17626.6—2008 Electromagnetic Compatibility—Testing and Measurement Techniques—Immunity to Conducted Disturbances Induced by Radio-Frequency Fields
GB/T 17626.8—2006 Electromagnetic Compatibility—Testing and Measurement Techniques—Power Frequency Magnetic Field Immunity Test
GB/T 17626.9—1998 Electromagnetic Compatibility—Testing and Measurement Techniques—Pulse Magnetic Field Immunity Test
GB/T 17626.10—1998 Electromagnetic Compatibility—Testing and Measurement Techniques—Damped Oscillatory Magnetic Field Immunity Test
GB/T 17626.11—2008 Electromagnetic Compatibility—Testing and Measurement Techniques—Voltage Dips, Short Interruptions and Voltage Variations Immunity Tests
GB/T 17626.12—1998 Electromagnetic Compatibility—Testing and Measurement Techniques—Oscillatory Waves Immunity Test
GB/T 20438.1—2006 Functional Safety of Electrical/Electronic/ Programmable Electronic Safety-related Systems—Part 1: General Requirements
GB/T 20438.2—2006 Functional Safety of Electrical/Electronic/ Programmable Electronic Safety-related Systems—Part 2: Requirements for Electrical/Electronic/Programmable Electronic Safety-related Systems
GB/T 20438.3—2006 Functional Safety of Electrical/Electronic/
Programmable Electronic Safety-related System s—Part 3: So ftware Requirements
GB/T 21109.1—2007 Functional Safety—Safety Instrumented Systems for the Process Industry Sector—Part 1: Framework Definitions System Hardware and Software Requirements
GB 50217—2007 Code f or Design o f Cables of Electric Engineering
GB 50229—2006 Code for Design of Fire Protection for Fossil
DL / T 5428 — 2009 Fuel Power Plants and Substations
DL/T 435—2004 Code for the Prevention of Pulverized Coal Firing Furnace Explosions/Implosions in Power Plant Boilers
DL/T 589—1996 Directives of Thermal Instrumentation and Control for Coal Fired Boiler in Power Plant
DL/T 590—1996 Directives of Thermal Instrumentation and Control for Condensation Type Turbine in Power Plant
DL/T 591—1996 Directives of Thermal Instrumentation and Control for Turbo-Generator in Power Plant
DL/T 592—1996 Directives of Thermal Instrumentation and Control for Boiler Feedwater Pump in Power Plant
DL/T 641—2005 Electric Valve Actuators for Power Plant
DL/T 701—1999 Thermopower Au tomation-Vocabulary for Fossil Fired Power Plant
DL/T 711—1999 Test Guide of Steam Turbine Governing System
DL/T 834—2003 Guide for the Prevention of Water and Cool Steam Damage to Steam Turbines in Fossil Power Plant
DL/T 892—2004 Specification o f Steam Turbine for Pow er Plant
DL 5000—2000 Technical Co def or Designing Fossil Fuel Power Plant
DL/T 5182—2004 Technical Rule for Designing of Lo cal Equipment Installation, Pipeline and Cables of I&C in Power Plant
SD 268—1988 Specification for Power Station Coal Fired Boiler
NFPA 85—2004 Boiler and Combustion Systems Hazards Code
ASME TDP-1 — 1998 Recommended Practices for the Prevention of Water Damage to S team T urbines Used for Electric Power Generation
3 Terms and Definitions, Abbreviations
In addition to the terms and definitions specified in GB/T 13983 and DL/T 701, the following terms and definitions, as well as abbreviations are applicable to this code.
3.1 Terms and Definitions
3.1.1
One out of two for binary variable
Logic consisting of two binary variables reflecting the same event. When any variable is "true", the logic output is "true".
3.1.2
Two out of three for binary variable
Logic consisting of three binary variables reflecting the same event. When any two variables are "true", the logic output is "true".
3.1.3
Dual redundancy for analog variable
One variable is measured simultaneously by two analog variable transmitters or sensors for mutual standby.
3.1.4
Triple redundancy for analog variable
One variable is measured simultaneously by three analog variable transmitters or sensors for mutual standby.
3.1.5
Multiple redundancy for analog variable
One variable is measured simultaneously by more than three analog variable transmitters or sensors, for mutual standby.
3.1.6
Programmable electronic
Based on computer technology, programmable electronic can be composed of hardware, software, and their input and (or) output units.
3.1.7
Logic system
The part used to perform the decision and transition for functional logic in this system. A logic system provides output in particular sequence to respond to external input and internal logic. Logic system includes:
1 Hardwired system: devices and their interconnecting wiring.
2 The system based on microprocessor.
1) Computer hardware, power supply, I/O device and their interconnecting parts.
2) Operating system and logic software.
3.1.8
Programmable electronic logic system
Logic system based on one or more programmable electronic devices, used for control, protection or monitoring, which includes all elements in the system, such as power supply, input device, data highway, other communication channels, and output device, etc.. For example: PLC, DCS, etc..
3.1.9
Safety function
The function realized by safety-related programmable electronic system, other technical safety-related systems or external risk reduction facilities in respect of certain hazardous events, in order to achieve or maintain the safety state of controlled equipment.
3.1.10
Safety-related system
The specified system must be capable of realizing the required safety function to achieve or maintain the safety state of equipment controlled; the system alone or together with other safety-related programmable electronic systems, other technical systems or external risk reduction facilities can achieve the safety integrity required by the necessary safety function.
3.1.11
Safety integrity
The probability that safety-related system successfully achieves the safety function required under conditions specified and within the time specified.
3.1.12
Safety integrity level; SIL
A discrete level (one of the four possible levels), used to specify the safety integrity requirements of safety function assigned to safety-related programmable electronic system. SIL 4 herein is the highest, and SIL 1 is the lowest. See Table 3.1.12.

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