This regulation is formulated to standardize and normalize the grounding design of the automation system of chemical plants, so as to ensure the stable and accurate operation of the automation system and protect the safety of personnel and equipment. This regulation applies to the grounding design of instrument detection and control, PLC, DCS and computer systems of newly built and expanded chemical plants. This regulation does not apply to the lightning protection grounding of instrument systems. HG/T 20513-2000 Instrument System Grounding Design Regulations (with clause explanation) HG/T20513-2000 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
Design Code of Instrument Grounding
Design Code of Instrument GroundingHG/T20513-2000
Editor: China Hualu Engineering Corporation
Hunan Chemical Industry Design Institute
Approval Department: State Petroleum and Chemical Industry BureauImplementation Date: June 1, 2000
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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1.0.1 This regulation is formulated to standardize and normalize the grounding design of the automation system of chemical plants, so as to ensure the stable and accurate operation of the automation system and protect the safety of personnel and equipment. 1.0.2 This regulation applies to the grounding design of instrument detection control, PLC, DCS and computer systems of newly built and expanded chemical plants. This regulation does not apply to lightning protection grounding of instrument systems. 1.0.3
When implementing this provision, it shall also comply with the provisions of the relevant national standards in force. 255
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Protective Grounding
The metal shell of the electric meter and the metal part of the automatic control equipment that is normally not charged, which may carry dangerous voltage due to various reasons (such as insulation damage, etc.), shall be protected by grounding. The automatic control equipment usually referred to is as follows 1
Instrument panel, instrument operation table, instrument cabinet, instrument rack and instrument box; DCS/PLC/ESD cabinet and operation station;
Computer system cabinet and operation table;
Power supply panel, power supply box, electric meter housing, cable tray (tray), threading pipe, junction box and armored cable 4
Armored sheath;
5Other various automatic control auxiliary equipment.
2.0.2 The metal shell of small low-voltage electrical appliances such as buttons, signal lights, relays, etc. installed on metal dials in non-explosion-hazardous places does not need to be grounded when the electrical contact with the metal dial frame that has been grounded is good. 2.0.3 Field instruments, transmitters, local switches, etc. powered by less than 36V do not need to be grounded unless there is a special need.
Any place that has been grounded can be considered to have been grounded electrostatically. 2.0.4
When using anti-static raised floors in the control room, electrostatic grounding should be performed. Electrostatic grounding can be used in the same grounding system as protective grounding. 256
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General provisions
3.1.1 In order to ensure the normal and reliable operation of the automation system, working grounding should be provided. The content of working grounding is signal loop grounding, shielding grounding, and intrinsically safe instrument grounding. 3.2
Signal loop grounding
3.2.1 In automation systems and electronic equipment such as computers, non-isolated signals need to establish a unified signal reference point, and the signal loop grounding (usually the negative pole of the DC power supply) should be carried out. 3.2.2 Isolated signals do not need to be grounded. The isolation here should mean that each input (output) signal and other input (output) signal circuits are insulated, insulated from the ground, and the power supplies are independent and isolated from each other. 3.3
Shield grounding
Components used to reduce electromagnetic interference in the instrument system, such as the cable shield, the noise suppression line, and the shield on the instrument3.3.1
grounding terminals, should all be shielded and grounded.
3.3.2In areas with strong lightning strikes, the spare cores of ordinary multi-core cables without shielding layers laid outdoors should be grounded according to the shielding.
If it is a shielded cable, the shielding layer has been grounded, and the spare core can be ungrounded. The spare core of the multi-core cable in the pipe can also be ungrounded.
3.4 ​​Intrinsically safe instrument grounding
Components of the intrinsically safe instrument system that must be grounded for safety functions should be grounded according to the requirements of the instrument manufacturer3.4.1
3.4.2The busbar of the Zener safety barrier must be connected to the common terminal of the DC power supply, and the busbar (or guide rail) of the Zener safety barrier should be grounded for intrinsic safety.
3.4.3 Isolation type safety barrier does not need grounding. 257
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The grounding system consists of two parts: grounding connection and grounding device. 4.0.1
The grounding connection includes: grounding connection line, grounding busbar, grounding branch line, grounding collection board, grounding trunk line. 1
2The grounding device includes: main grounding plate, grounding trunk line, grounding electrode. See Figure 4.0.1. 4.0.2The grounding connection of the instrument and control system adopts the method of classification and collection, and finally connected to the main grounding plate. The starting end of the neutral line of the AC power supply should be connected to the grounding electrode or the main grounding plate. 4.0.3 When the electrical professionals have connected the metal structure of the building (or device), foundation steel bars, metal equipment, pipelines, PE busbars of the incoming distribution box, and lightning arrester down conductors to form an equipotential connection, all types of grounding in the instrument system should also be connected to the main grounding plate to achieve equipotential connection and be connected to the earth with the grounding device shared with the electrical device. See Figure 4.0.3. 4.0.4 It is strictly forbidden to connect switches or fuses in various grounding connections. 258
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field instrument grounding connection method
5.1.1For the field instrument cable trough, instrument cable protection tube and instrument housing above 36V, the protective grounding shall be connected to the nearest grounded metal component every 30 meters with a grounding connection wire, and the reliability and electrical continuity of the grounding shall be ensured.
It is strictly forbidden to use metal equipment, pipelines and related metal components for storing and transporting flammable media for grounding.
5.1.2The working grounding of field instruments shall generally be grounded on the control room side. See Figure 5.1.2. 5.1.3 For field instruments that are required or must be grounded on site, they should be grounded on the field side. See Figure 5.1.3. 5.1.4 For field instruments that are required or must be grounded on site, and the receiving instruments in the control room are to be grounded on the control room side, the two grounding points should be electrically isolated. See Figure 5.1.4. 5.1.5 The shielding layers of the cables on both sides of the field instrument junction box should be bridged inside the box. The spare cores of the multi-core cables in the field instrument junction box should be bridged inside the box and then processed according to 3.3.2. See Figure 5.1.5.
5.2 Grounding connection method for instruments in the control room
5.2.1 The automatic control equipment (instrument cabinet, table, panel, rack, box) where instruments are installed in the control room (centralized) should be classified to set up protective grounding busbars, signal and shielding grounding busbars and intrinsically safe grounding busbars. The protective grounding terminals and signal and shielding grounding terminals of each instrument equipment are connected to the protective grounding bus and the working grounding bus through their own grounding lines. Various grounding buses are connected to the protective grounding board and the working grounding board through their own grounding branches. Each busbar (mounting track) of the Zener safety barrier can be connected to the working grounding board by two grounding branches. Each busbar of the Zener safety barrier can also be connected in series at both ends by grounding branches, and then connected to the working 261
standard network wmbzsoao.ccn grounding board. See Figure 5.2.1. 5.2.2 The protective grounding board and the working grounding board are connected to the main grounding plate through their own grounding trunks. See Figure 5.2.2 5.2.3 Use the main grounding trunk to connect the main grounding plate and the grounding electrode. 262
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connected from the anti-static
raised floor keel support in the control room
connected from each centrally installed instrument! Connected from the metal cable tray and protection pipe in the control room and other automatic control equipment that need to be grounded
protective grounding trunk line
static grounding trunk line
protective grounding trunk line
protective grounding main board
protective grounding trunk line
total grounding board
grounding total line
connected from each Centrally installed instrumentation
Working grounding busbar on automatic control equipment
busbar and safety cabinet busbar
signal loop and shielding grounding and local
grounding branch line
working grounding main board
working grounding trunk
grounding electrode
grounding system diagram of control room
Figure 5.2.23
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