This regulation is applicable to the conventional calculation of power design of chemical plants. HG 20551-1993 Common calculation regulations for power design of chemical plants HG20551-1993 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
20551-93
Common Calculation Rules for Power Design of Chemical Plants
1993-08-26
1993-12-01
Ministry of Chemical Industry of the People's Republic of China
Industry Standard of the People's Republic of China
Common Calculation Rules for Power Design of Chemical Plants
20551-93
Editor: Fourth Design Institute of Ministry of Chemical Industry
Approving Department: Ministry of Chemical Industry
Effective Date: December 1, 1993
Engineering Construction Standard of Ministry of Chemical Industry Quasi-Editorial Center
Beijing
Ministry of Chemical Industry Document
Chemical Industry Development (1993) No. 600·
Notice on Approving the "Regulations on Common Calculations for Power Design of Chemical Plants" as a Chemical Industry Standard
To all provincial, autonomous region, municipality directly under the Central Government, and independently planned cities, and all relevant design units:
The "Regulations on Common Calculations for Power Design of Chemical Plants", organized by the Electrical Design Technology Center of the Ministry of Chemical Industry and edited by the Fourth Design Institute of the Ministry of Chemical Industry, has been reviewed and approved as a chemical industry standard, with the number HG20551-93, and will be implemented from December 1, 1993. This standard is managed by the Electrical Design Technology Center of the Ministry of Chemical Industry and published and distributed by the Engineering Construction Standard Editing Center of the Ministry of Chemical Industry. Ministry of Chemical Industry of the People's Republic of China
August 26, 1993
1 Total time
2 Load calculation
2.1 Capacity conversion for repeated short-time working system
2.2 Determine the calculated load by the required coefficient method
2.3 Calculate the load by the conversion coefficient method
2.4 Estimate the load by the unit product power consumption method
2.5 Single-phase load calculation
3. Calculation of power loss and electric energy consumption
3.1 Power loss
3.2 Electric energy consumption
4 Calculation of reactive power compensation.
4.1 Calculation of compensation capacity of electrostatic capacitor
4.2 Calculation of series inductance of electrostatic capacitor
4.3 Calculation of discharge resistance
5 Calculation of short-circuit current
Basic principles and conditions for short-circuit current calculation5.1
Calculation of circuit element parameters and network transformation
Calculation of periodic components of three-phase short-circuit current
Calculation of impulse current and full current
Asymmetric short-circuit ammeter Calculation
Calculation of thermal effect of short-circuit current
Calculation of short-circuit current in systems less than 1 kV
5.8 Calculation of short-circuit current in large-capacity shunt capacitor devices5.9 EIEC calculation method
Single-phase grounding capacitance current and compensation in small grounding current systems (1)
6.1 Single-phase grounding capacitance current in systems with ungrounded neutral points6.2 High-resistance grounding methods
6.3 Grounding compensation for de-isolation coils
Motor starting voltage Horizontal calculation
7.1 Calculation method
7.2 Parameter calculation of network components
7.3 Iteration algorithm
7.4 Simplified algorithm
Battery capacity selection calculation
Voltage control calculation method
8.2 Step load calculation method
8.3 Nickel battery
8.4 Selection of battery quantity
High harmonic calculation
9.1 Calculation Main factors involved in calculation
9.2 Calculation formula
Stability check of high-voltage power equipment
Technical data
Dynamic and thermal stability check of current transformer
Current limiting reactor
10.4Dynamic and thermal stability check of support insulator and bushing insulator 10.5Dynamic and thermal stability check of rectangular busbar.
Cross-section selection and calculation of conductor and cable
11.1 Calculation conditions
11.2 Calculation of conductor and cable cross-section selection
12 Calculation of generator protection setting
12.1 Longitudinal differential protectionbzxz.net
12.2 Overcurrent protection
Electric power industry
13. Calculation of power transformer protection setting
Longitudinal differential protection
(85))
Current quick-break protection
13.3 Overcurrent protection with time limit
13.4 Low voltage Overcurrent protection for starting
13.5 Overcurrent protection for compound voltage starting
13.6 Overload protection
13.7 Single-phase grounding protection
High-voltage motor protection setting calculation
Current quick-break protection
Longitudinal differential protection
Overload protection
Single-phase grounding protection
14.5 Low voltage protection
14.6 Synchronous motor out-of-step protection||tt ||6-~10kV electrostatic capacitor bank protection setting calculation 15.1 Unlimited overcurrent protection
15.2 Overvoltage protection
15.3 Single-phase grounding protection
6-~10kV busbar section circuit breaker current quick-break protection setting calculation 6~10kV line protection setting calculation
Current quick-break protection
With time-limited current quick-break protection
With time-limited overcurrent protection
17.4 Single-phase Grounding protection
17.5 Longitudinal differential protection
17.6 Overcurrent protection for low voltage starting
Directional overcurrent protection
18 Calculation of grounding resistance
18.1 Calculation of power frequency grounding resistance of artificial grounding body18.2 Calculation of impulse grounding resistance of artificial grounding body19 Calculation of illumination
+center
Utilization coefficient method
·.19.2 Unit capacity calculation method
19.3． Point-by-point calculation method
20 Calculation of protection against direct lightning strike
20.1 Rolling ball protection calculation method
20.2 Broken line protection calculation method
21.． 21.2 Selection and calculation of accident diesel generator sets, conversion of accident loads and connection sequence
21.3 Selection of diesel generator capacity: 21.3 Selection of diesel engine power
Natural environment verification
22· Load verification of transformers and selection and calculation of secondary circuit conductors 22.1
Calculation of secondary load verification of current transformers
22.2 Calculation of secondary circuit conductors of current transformers 22.3 Calculation of secondary load of voltage transformers
22.4 Calculation of the selection of the secondary conductor of the voltage transformer and the selection of the control cable for the control and signal circuits 22.5
Article explanation
（243)
.(256)
（258)
·(270)
1 General
1.0.1 This regulation is for optimizing the power design of chemical plants and is an important measure for the standardization of design calculations. It stipulates the commonly used calculation methods, formulas and data for power design of chemical plants.
1.0.2 This regulation is applicable to the routine calculation of power design of chemical plants. 1.0.3 The calculation method proposed in this regulation is based on the premise of meeting the accuracy requirements of engineering design. It can be calculated manually or conveniently by computer programming. 1.0.4 The use of this regulation shall comply with the national standards and specifications used in this regulation, and other relevant national standards and specifications shall also be implemented. 1.0.5 The technical data of electrical equipment involved in the calculation should adopt the official data provided by the manufacturer.
Load calculation
Capacity conversion for repeated short-time working
2.1.1 The capacity of repeated short-time working is converted to the rated power under uniform duty cycle: converted to the rated power Pn when e=25%, kWPN
Where: EN
EN2PNe
Rated duty cycle of a motor (nameplate data) (2.1.1)
Rated power of a motor at its rated duty cycle eN, W: PNe
Value when the duty cycle is 25% (nameplate data). 2.2 Determine the calculated load by the need coefficient method
Determine the calculated load by the need coefficient method:
P3o-KcP
(2.2.1-1)
Where: P30-
Where: Q30-
The maximum active power in half an hour during the maximum load shift, kW: The sum of the rated power of each device in each power equipment group, kW: The average need coefficient classified by power equipment, see Table 2.2.1. Q3o Psotgp
S3o=P+Q
(2. 2. 1-2)
(2.2.1-3)
-Maximum reactive power in half an hour under maximum load, kvar; Sao-Maximum apparent power in half an hour under maximum load, kVA, tgp--Tangent function of power factor angle. Requirement coefficient and power factor of electrical equipment, serial number
Name of electrical equipment
Gas compressor
Pumps used continuously in the process
(30kw and below)
Pumps used continuously in the process
(30kW and above)
Intermittent use within 1000 hours per year
Intermittent use within 500 hours per year
Intermittent use within 100 hours per year
Stirring machinery of various tanks, evaporators, separators, etc.
Resistors, drying ovens, heaters||t t||Feeding screw or belt conveyor, bucket elevator, screening and other group interlocking operation machinery
Name of electrical equipment
The above equipment in non-interlocking operation
Cooling tower ventilator and hot and cold water circulation pump
Supply and drainage pump
Production ventilator
Sanitary ventilator
Air cooler
High-voltage electrical equipment
Compressor
Refrigerator
Water pump and other 0.8~0.95 pumps driven by high-voltage motors
Ball mill
Crusher (large and small can be classified into 10 items) Submersible arc furnace| |tt||Yellow phosphorus furnace
Equipment for mechanical manufacturing and test plants
Light-load machine tools (such as turning, planing, inserting, milling, drilling, 244
vertical lathes, grinding machines, etc.)
Heavy-load machine tools (such as molds, eccentric punch presses, automatic lathes, hexagonal lathes, rough machining lathes, spiral milling machines, etc.)
Reference nameplate
Reference nameplate
Reference nameplate
Reference nameplate
0.75~0.91:
Reference nameplate
0.9~0.950.48~0.33
Name of electrical equipment||tt ||Extraordinary heavy-duty machine tools (such as drums, crushers, forging hammers, forging machines, wire drawing lathes, sand rolling machines, etc.) Mobile electric tools
Continuous heating resistance furnaces, drying ovens
Intermittent heating resistance furnaces, test and parts heating equipment
Testing instruments
Low-frequency induction furnaces
Crane and electric hoist with E=25%
Lighting, lighting
Production plants
Offices, laboratories
Dormitory areas
Outdoor lighting
Emergency lighting
For multiple groups of electrical equipment with different working systems: ZP3o-Kzw·ZKc· Pn
EQ3o--Kzy · ZKc - Pn · tg9S30= V(EP30)2+(EQ3)2
(2.2.2-1)
(2.2.2~2)
(2.2.2-3)
(2. 2. 2-4)
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