HG/T 20509-2000 Instrument power supply design regulations (with clause explanation)
Some standard content:
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Design Code for Instrument Power Supply System
Design Code for Instrument Power Supply System HG/T20509-2000
Editor: China Chengda Chemical Engineering Company Approval Department: State Bureau of Petroleum and Chemical Industry Implementation Date: June 1, 2001 National Chemical Engineering Construction Standard Editing Center (formerly the Engineering Construction Standard Editing Center of the Ministry of Chemical Industry) 2001 Beijing
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This regulation applies to the power supply design of measurement and control instruments in chemical plants, and does not apply to the power supply design of instrument repair workshops1.0.1
.
The relevant standards are as follows:
HG/T20664
HG/T20636.4
"Technical Regulations for Power Supply Design of Chemical Enterprises", "Design Division of Automatic Control and Electrical Majors", "Design Specifications for Power Installations in Explosive and Fire Hazardous Environments", "Design Specifications for Electronic Computer Rooms"
When implementing these regulations, they should also comply with the provisions of the relevant national standards in force. 169
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2.1 Power supply range
The power supply of instruments and automation devices, including: conventional instrument systems;
DCS, PLC and monitoring computer systems; automatic analysis instruments:
Safety interlock system (Safety Interlock System referred to as SIS): industrial television system.
Power supply for instrument auxiliary facilities, including:
Instrument panel (cabinet) lighting;
Electric heating system for instruments and measuring pipelines.
Power supply for other automatic monitoring systems.
Load level
2.2.1 According to the provisions of the "Technical Regulations for Power Supply Design of Chemical Enterprises" (HG/T20664) on the classification of power load levels, instrument power loads can be divided into two levels, namely, loads with special power supply requirements and third-level loads. Note: The "Technical Regulations for Power Supply Design of Chemical Enterprises" (HG/T20664) divides power loads into four levels of loads, namely, first-level loads, second-level loads, third-level loads, and loads with special power supply requirements, according to the importance of power loads in the continuous production process of chemical industry and the requirements for power supply reliability and continuity. 2.2.2 In most cases, instrument power loads belong to loads with special power supply requirements. This type of load will disrupt the production process after the power supply is interrupted, causing equipment damage and personal injury accidents, and causing economic losses, and an emergency power supply needs to be set up.
2.2.3In a few cases, the instrument power load belongs to the third-level load. This type of load will not disrupt the production process after the power is interrupted, will not cause equipment damage and economic losses, and does not need to set up an emergency power supply. 170
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The instrument working power supply can be divided into uninterruptible power supply and ordinary power supply according to the needs of the instrument power load. When the instrument power load belongs to the load with special power supply requirements, the instrument working power supply should use uninterruptible power supply. When the instrument power load belongs to the third-level load, the instrument working power supply can use ordinary power supply. 171
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General power quality indicators are as follows:
1 AC power
Voltage: 220V±10%;
Frequency: 50±1Hz;
Waveform distortion rate: less than 10%.
Power quality
2 DC power (provided by DC power box or DC regulated power supply) voltage: 24±1V;
Ripple voltage: less than 5%;
AC component (effective value): less than 100mV. The power interruption time should be less than the allowable power interruption time of the electrical equipment: 3
Instantaneous voltage drop: less than 20%.
The quality indicators of uninterruptible power supply are as follows:
AC power supply
Voltage: 220V±5%;
Frequency: 50±0.5Hz;
Waveform distortion rate: less than 5%.
2DC power supply
Voltage: 24±0.3V;
Ripple voltage: less than 0.2%;
AC component (effective value): less than 40mV. 3Allowable power interruption time: ≤3ms;
Instantaneous voltage drop: less than 10%. Www.bzxZ.net
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The power supply capacity of the instrument should be calculated as 1.2~1.5 times the total power consumption of the instrument. The capacity of the uninterruptible power supply used in DCS, PLC, SIS and other systems can be calculated as 1.2~1.25 times the total power consumption of each system. If backup is considered, it should be calculated as 1.5 times. 173
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4.1 Power supply configuration principle
4.1.1 The quality of instrument power supply should be higher than the requirements of instruments and automation devices for power quality, that is, the power supply voltage, AC power frequency and waveform distortion, DC power ripple voltage, power supply instantaneous interruption time, power supply instantaneous drop and other indicators should be better than the requirements of power-consuming instruments.
4.1.2 Instruments with special requirements for power supply should be equipped with special power supply equipment, and their power supply quality indicators should meet the requirements of power-consuming instruments.
4.2 Ordinary power supply
Ordinary power supply can be used for instrument power supply in the following cases: small production equipment and public engineering systems without high temperature, high pressure and explosion hazard; production equipment using pneumatic instruments and without signal interlocking system: 2
3 General analysis and monitoring system.
When the instrument power supply adopts ordinary power supply, the electrical power supply can adopt single circuit or double circuit power supply. 4.3 Uninterruptible power supply
Uninterruptible power supply should be used for instrument power supply in the following cases: large and medium-sized chemical production equipment, important public engineering systems and auxiliary production equipment; production equipment with high temperature, high pressure and explosion hazard; production equipment with more and more complex signal interlocking systems; production equipment using DCS, PLC, ESD and other monitoring systems; monitoring systems for large compressors and pumps.
When the instrument power supply adopts uninterruptible power supply, the electrical power supply should adopt static uninterruptible power supply device (UPS). Statement: This information is for communication and learning only, and is strictly prohibited for commercial use! Download directory: BIAOZHUN.YS168.COM4.4 Simultaneous configuration of two power supplies
4.4.1 For some engineering projects, in order to reduce the capacity of UPS, the instrument power supply can use uninterruptible power supply and ordinary power supply respectively according to different requirements.
When two power supplies are used at the same time, the two power supplies cannot be operated in parallel. 175
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Power supply system design and design conditions
Design principles of power supply system
Power supply system design should formulate advanced, reasonable, safe and reliable power supply design 5.1.1
Scheme.
Power supply system design should meet the following general requirements: the same control system should be powered by the same power supply; when DCS is used, the transmitter should be powered by DCS; when AC power supply is used, the impact state protection measures when the instrument system is started should be considered. The instrument power supply system should have electrical protection and proper grounding. The power supply of important safety interlock systems should meet the following requirements. The power supply unit of the important safety interlock system should consider redundancy measures; the solenoid valve power supply voltage should use 24V DC or 220V AC, and the following requirements should be considered: the DC solenoid valves of the important safety interlock system should be powered by a redundant DC regulated power supply or a DC UPS. The power supply capacity should be 1.5~2 times the rated working current; the AC solenoid valves of the important safety interlock system should be powered by an AC UPS. When the solenoid valve is normally energized, the power supply capacity can be 1.5~2 times the rated power consumption.5~2 times; when the solenoid valve is not energized normally, the power supply capacity can be considered as 2~5 times the rated power consumption.
3 For the flammable gas and toxic gas detection system, when it is still necessary to continue monitoring for a period of time after a power outage, it is advisable to use UPS power supply.
Ordinary power supply system
Design the power supply system according to the power supply type and voltage level of the power meter. The power supply system can adopt three-level 5.2.1
or two-level power supply as needed.
5.2.2 In the three-level power supply system, set up the main power supply box, sub-power supply box, and instrument switch board; in the two-level power supply system, set up the main power supply box and sub-power supply box.
The setting of protective electrical appliances shall comply with the following provisions: 5.2.31
Statement: This porcelain material power supply is equipped with a main circuit breaker to break the circuit! Download catalog: BIAOZHUN.YS168.COM2 The input end of the power distribution box is equipped with a main switch, no fuse, and the output end is equipped with an output switch and fuse. The DC power is only equipped with a fuse for the positive pole:
3 The instrument switch board is not equipped with an input main switch or fuse. The AC output end is equipped with a double-pole switch and a fuse for the phase line: The positive pole of the DC output end is equipped with a single-pole switch and a fuse, but when the negative pole is floating, the output end should use a double-force switch.
The protection characteristics of various switches and protective electrical appliances should comply with the provisions of Section 7.2. 5.2.4
5.2.5 If it is difficult to supply power to the field instruments belonging to the third-level load, it can be supplied by the low-voltage power distribution box (panel) nearby on site.
The DC 24V power supply should be selected according to the scale of the power load. Each instrument power supply provided by the electrical department, whether single-circuit or dual-circuit, can only have one circuit for each power supply line sent to the control room. 5.27
5.2.8The instrument switch board in each instrument panel should have at least 10% spare circuits, and each sub-power supply box should have at least 20% spare circuits.
5.3 Uninterruptible power supply system
5.3.1When the uninterruptible power supply supplies power to systems such as DCS, PLC, SIS and monitoring computers, a two-level power supply method can be adopted, that is, a main power supply box and a sub-power supply box are set up. 5.3.2When the uninterruptible power supply is provided by the electrical department, the electrical department can be responsible for the primary power distribution design of the main power supply box, and the automatic control department can submit the design conditions. The main power supply box can be installed in the control room. 5.3.3
When the UPS is provided as a complete set by the DCS supplier, the automatic control department is responsible for the design of the main power supply box and the sub-power supply box, and the main power supply box and the sub-power supply box can share a distribution cabinet (panel). 5.3.4
The setting of protective devices shall comply with the following provisions: The main power supply box shall be equipped with an input main circuit breaker and an output sub-circuit breaker: The sub-power supply box shall be equipped with an output circuit breaker, and no protective devices shall be installed at the input end. The protection characteristics of various switches and protective devices shall comply with the requirements of Section 7.2. The sub-power supply box should have at least 20% spare circuits. 5.4 Power supply design conditions
According to the provisions of "Design Division of Automatic Control and Electrical Majors" (HG/T20636.4), the total power supply of the instrument 5.4.1
Statement of the power supply and disconnection of the power supply equipment When the uninterruptible power supply device is supplied as a complete set with the instrument system, the electrical major is only responsible for providing the input power supply. 5.4.2 The instrument power supply design conditions submitted by the automatic control major to the electrical major should include the following: 1 Total power consumption of the instrument (kVA):
Of which, ordinary power supply (KVA)
Uninterruptible power supply (kVA)
Voltage level and allowable fluctuation range:
Power frequency and allowable fluctuation range:
Whether the ordinary power supply adopts dual-circuit power supply; Number of power supply circuits of the uninterruptible power supply:
Uninterruptible power supply battery backup time (minutes): Power supply interruption time requirements;
Separate power supply for field instruments:
Heating power supply for field instruments and pipelines.
Except for random large-capacity UPS and electric actuators that may require AC 380V power supply from the electrical major, in general, the ordinary main power supply and uninterruptible main power supply provided by the electrical major should not adopt AC 380V power supply. 178
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AC uninterruptible power supply device (UPS)
When UPS is supplied as a complete set by automation equipment (such as DCS), the automatic control department is responsible for the selection and design of UPS. For large-capacity UPS above 10kVA, it is advisable to set up a separate power supply room; small-capacity UPS below 10kVA and 10kVA can be installed in the cabinet room of the control room. 6.1.3
The technical indicators of UPS shall meet the following requirements: 1 Input parameters
Input voltage three-phase 380V±15% or single-phase 220V±15% Input frequency 50±2.5Hz
Output parameters shall meet the provisions of Article 3.1.2: overload capacity is greater than or equal to 150% (within 5s). 3
Single-phase output is advisable for power supply below 20kVA. The selection of backup batteries should comply with the following provisions: backup power supply time (i.e. uninterrupted power supply time): 15~30min; charging performance: 2 hours to charge to 80% of the rated capacity; sealed maintenance-free lead-acid batteries are preferred, and nickel batteries can also be used. UPS should have fault alarm and protection functions. UPS should have a voltage conversion and voltage stabilization link.
UPS should have the following maintenance bypass functions:
The maintenance bypass should be guided from the voltage conversion and voltage stabilization link, or the maintenance bypass should be equipped with a separate voltage stabilization transformer; the maintenance bypass should have the function of synchronizing with the internal main circuit; the switching time between the maintenance bypass and the internal main circuit should be less than or equal to the allowable power interruption time. The mean time between failures (MTBF) of UPS should not be less than 55,000h (not less than 150,000h with automatic bypass).1
Statement: Power supply and power consumption of the power supply equipment. When the uninterruptible power supply device is delivered as a complete set with the instrument system, the electrical department is only responsible for providing the input power supply. 5.4.2 The design conditions of the instrument power supply submitted by the automatic control department to the electrical department should include the following contents: 1 Total power consumption of the instrument (kVA):
Of which, the ordinary power supply (KVA)
Uninterruptible power supply (kVA)
Voltage level and allowable fluctuation range:
Power frequency and allowable fluctuation range:
Whether the ordinary power supply adopts dual-circuit power supply; Number of power supply circuits of the uninterruptible power supply:
Uninterruptible power supply battery backup time (minutes): Power supply instantaneous interruption time requirements;
Separate power supply for field instruments:
Heating power supply for field instruments and pipelines.
Except for the large-capacity UPS and electric actuators that may require the electrical professionals to provide an AC 380V power supply, in general, the ordinary main power supply and uninterruptible main power supply provided by the electrical professionals should not be powered by AC 380V. 178
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AC uninterruptible power supply device (UPS)
When UPS is supplied as a complete set by the automation device (such as DCS), the automatic control professional is responsible for the selection and design of UPS. Large-capacity UPS above 10kVA should have a separate power supply room; small-capacity UPS below 10kVA and 10kVA can be installed in the cabinet room of the control room. 6.1.3
The technical indicators of UPS shall meet the following requirements: 1 Input parameters
Input voltage three-phase 380V±15% or single-phase 220V±15% Input frequency 50±2.5Hz
Output parameters shall meet the requirements of Article 3.1.2: Overload capacity is greater than or equal to 150% (within 5s). 3
Single-phase output is suitable for power supply below 20kVA. The selection of backup battery shall meet the following requirements: Backup power supply time (i.e. uninterrupted power supply time): 15~30min; Charging performance: 2 hours to charge to 80% of rated capacity; Sealed maintenance-free lead-acid battery is suitable, and nickel battery can also be used. UPS should have fault alarm and protection functions. UPS should have voltage transformation and voltage stabilization link.
UPS should have the following maintenance bypass functions:
Maintenance bypass should be guided after the voltage transformation and voltage stabilization link, or the maintenance bypass should be equipped with a separate voltage stabilization transformer; the maintenance bypass should have the function of synchronization with the internal main circuit; the switching time between the maintenance bypass and the internal main circuit should be less than or equal to the allowable power interruption time. The mean time between failures (MTBF) of UPS should not be less than 55,000 hours (not less than 150,000 hours with automatic bypass).1
Statement: Power supply and power consumption of the power supply equipment. When the uninterruptible power supply device is delivered as a complete set with the instrument system, the electrical department is only responsible for providing the input power supply. 5.4.2 The design conditions of the instrument power supply submitted by the automatic control department to the electrical department should include the following contents: 1 Total power consumption of the instrument (kVA):
Of which, the ordinary power supply (KVA)
Uninterruptible power supply (kVA)
Voltage level and allowable fluctuation range:
Power frequency and allowable fluctuation range:
Whether the ordinary power supply adopts dual-circuit power supply; Number of power supply circuits of the uninterruptible power supply:
Uninterruptible power supply battery backup time (minutes): Power supply instantaneous interruption time requirements;
Separate power supply for field instruments:
Heating power supply for field instruments and pipelines.
Except for the large-capacity UPS and electric actuators that may require the electrical professionals to provide an AC 380V power supply, in general, the ordinary main power supply and uninterruptible main power supply provided by the electrical professionals should not be powered by AC 380V. 178
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AC uninterruptible power supply device (UPS)
When UPS is supplied as a complete set by the automation device (such as DCS), the automatic control professional is responsible for the selection and design of UPS. Large-capacity UPS above 10kVA should have a separate power supply room; small-capacity UPS below 10kVA and 10kVA can be installed in the cabinet room of the control room. 6.1.3
The technical indicators of UPS shall meet the following requirements: 1 Input parameters
Input voltage three-phase 380V±15% or single-phase 220V±15% Input frequency 50±2.5Hz
Output parameters shall meet the requirements of Article 3.1.2: Overload capacity is greater than or equal to 150% (within 5s). 3
Single-phase output is suitable for power supply below 20kVA. The selection of backup battery shall meet the following requirements: Backup power supply time (i.e. uninterrupted power supply time): 15~30min; Charging performance: 2 hours to charge to 80% of rated capacity; Sealed maintenance-free lead-acid battery is suitable, and nickel battery can also be used. UPS should have fault alarm and protection functions. UPS should have voltage transformation and voltage stabilization link.
UPS should have the following maintenance bypass functions:
Maintenance bypass should be guided after the voltage transformation and voltage stabilization link, or the maintenance bypass should be equipped with a separate voltage stabilization transformer; the maintenance bypass should have the function of synchronization with the internal main circuit; the switching time between the maintenance bypass and the internal main circuit should be less than or equal to the allowable power interruption time. The mean time between failures (MTBF) of UPS should not be less than 55,000 hours (not less than 150,000 hours with automatic bypass).
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