DL/T 2034.1-2019Technical conditions of power energy substitution equipment access to power grid -- Part 1: General rules (English PDF)

4.1 Electric heating/cooling

Electric heating/cold electric energy alternative equipment can be divided into building heating/cooling equipment, industrial/agricultural production heating/cooling equipment, Three categories of household electric heating equipment.

a) Building heating/cooling equipment. mainly including electric boilers, distributed electric heating (carbon crystal plates, heating cables, electric heating films, etc.), heat pumps, etc.

Building electricity heating equipment and central air conditioning and other building electricity cooling equipment;

b) Heating/cooling equipment for industrial/agricultural production. provide heating/cooling equipment for industrial/agricultural production processes, mainly including electric kilns, industrial electricity Heating equipment such as boilers and metallurgical electric furnaces and refrigeration equipment such as industrial central air-conditioning;

c) Household electric heating equipment. mainly includes household electric heating equipment such as induction cookers, electric kettles, and electric water heaters.

4.2 Electric rotation force

According to different main purposes, electric power substitute equipment for electric power can be divided into two categories. industrial/agricultural production equipment and transportation equipment.

a) Industrial/agricultural production equipment. mainly refers to equipment driven by motors, which can be divided into auxiliary electric power according to different application scenarios Equipment, mining equipment, agricultural electric drainage and irrigation equipment, agricultural auxiliary production equipment, oil field drilling rigs, oil and gas pipeline power pressurization equipment Waiting

b) Transportation equipment. mainly includes electric vehicles, rail transit, port shore power, airport bridge-mounted APU and other equipment.

5.1 General requirements for grid connection

The general requirements for access to the grid are as follows.

a) There should be corresponding safety protection measures for electric energy substitution equipment connected to the grid, and should not affect the safe operation of the grid;

b) The voltage level of access to the power grid is generally based on the local power grid conditions, the power consumption capacity of electric energy replacement equipment, and the simultaneous rate of power equipment, etc.

Factors, determined after technical and economic comparison, need to meet the requirements of relevant grid standards;

c) The power configuration of important power users should meet the requirements of the GB/Z 29328 standard.

5.2 Voltage level

When electric energy substitute equipment is connected to the grid, the connected power supply voltage should be determined according to the capacity of the electrical equipment and the total capacity of the power receiving transformer Level, the selected standard voltage should meet the requirements of GB/T 156, and the power supply voltage level can generally be determined in Table 1.

5.3 Access method

The access method requirements are as follows.

a) 220/380V power supply electric energy substitute equipment, when the capacity is not more than 10/30kVA, it should be connected to the low-voltage distribution box; when it is larger, it should be connected Dedicated circuit for power distribution cabinet into the substation and distribution room;

b) Electric energy substitute equipment connected to 10kV grid, less than.2000kVA should be connected to ring network room (box) or T connected to overhead line, 2000~ 4000kVA should be connected to a 10kV switching station, and a dedicated line with a capacity greater than 4000kVA should be connected;

c) Electric energy substitute equipment connected to the 35kV grid should be connected to substations and switchyards.

5.4 Power distribution equipment

5.4.1 Distribution transformer

The requirements for distribution transformers are as follows.

a) Energy-saving transformers should be selected, and noise reduction measures should be taken in nearby residential areas (construction of power distribution rooms, construction of sound insulation walls or sound absorption barriers) Etc.), the transformers installed in the distribution room should use dry-type transformers;

b) When an independent transformer is used, its capacity should be 1.1 to 1.5 times the rated power of the connected electric energy substitute equipment.

5.4.2 Distribution wires

5.4.2.1 220V/380V low voltage distribution wire the requirements for low-voltage power distribution wires are as follows.

a) If the overhead line method is used for laying, insulation restoration treatment should be carried out after the connection line is connected. When laying along the wall, a flame-retardant, Insulated wire with low temperature resistance;

b) When laying by cable lines, outdoor terminals should be selected for low-voltage cable laying and poles, and branch gloves and weather-resistant Protective tube, waterproof and anti-aging.

5.4.2.2 10kV distribution wire the requirements for 10kV distribution wires are as follows.

a) If the overhead line is used for laying, the creepage distance of the line insulators in general areas should not be lower than the pollution level d specified in GB 50061.

The configuration requirements of the filth degree, the rated lightning impulse withstand voltage can be selected from a level higher than the nominal voltage of the system, in line with GB 311.1.Except for the exposed parts of the grounding ring, the line should be connected to the pole transformer, pole switch, lightning arrester and cable terminal.

Terminals, etc. are insulated and sealed, the conductor connection is encapsulated with flame-retardant insulation coil or flame-retardant insulation cover, and the jumper is connected to the insulation.

The edge cover should be filled with insulating material;

b) When laying by cable line, an outer sheath with waterproof, anti-termite and flame retardant properties should be adopted according to the use environment. Electricity the cable carrying capacity, the distance between the cable channel and other pipelines and the corresponding protective measures shall meet the requirements of GB 50217.

5.4.2.3 35kV distribution wire the selection of 35kV distribution conductor cross-section should meet the requirements of development and should be considered according to long-term planning.

6.1 Protection

Electric energy substitution equipment should be equipped with appropriate protection measures according to its power consumption characteristics. Other protection requirements are as follows.

a) When the electric energy substitute equipment is connected with 220V, 380V voltage level, the low-voltage switchgear and protection of the power distribution line shall comply with the provisions of GB 50054, grounding type, grounding resistance, grounding devices, protective conductors, etc. should comply with the provisions of GB 50065;

b) When the electric energy substitution equipment is connected with a voltage level of 10~35kV, the protection configuration should meet the requirements of GB/T 14285, grounding resistance, Grounding devices, etc. should meet the requirements of GB 50065.

6.2 Metering

When electric energy replacement equipment is connected, the measurement requirements are as follows.

a) For separately powered electric energy substitute equipment, an independent electric energy metering device should be equipped; for non-independently powered electric energy substitute equipment, it should be equipped with electric energy metering device following the equipment;

b) The electric energy metering device of electric energy substitute equipment can be classified according to the amount of electric energy it counts and the degree of importance of measurement.

According to the provisions of T448, the classification of Class I, II, and III can be determined according to the load capacity of electric energy substitute equipment or the average monthly power consumption.

See Table 2.

7.1 Power quality

7.1.1 Harmonics and Interharmonics

After the electric energy substitute equipment is connected, the harmonic voltage limit value, the allowable value of harmonic current, the limit value of interharmonics, etc. injected into the public grid access point should be divided Do not meet the requirements of GB/T 14549 and GB 24337.

7.1.2 Power factor

The power factor of electric energy replacement equipment is not less than 0.85.

7.1.3 Voltage unbalance

After the electric energy substitute equipment is connected, the voltage imbalance caused by the access point should meet the requirements of GB/T 15543.

7.1.4 Voltage fluctuation and flicker

After the electric energy substitute equipment is connected, the allowable value of voltage fluctuation due to load fluctuations such as the start and stop impact of the equipment shall comply with GB/T 12326 the limit.

7.2 Electromagnetic compatibility

The electromagnetic compatibility requirements are as follows.

a) The electromagnetic interference caused by the operation of electric energy substitution equipment to the environment should meet the requirements of GB 4824;

b) Electric energy substitution equipment should have a certain degree of electromagnetic compatibility immunity according to the actual situation, and meet the corresponding level of the standards listed in Table 3.

EMC immunity requirements.

Table 3 Electromagnetic compatibility immunity test standard

Standard of immunity parameter

1 Electrostatic discharge GB/T 17626.2

2 Radio frequency electromagnetic field radiation GB/T 17626.3

3 Electrical fast transient pulse group GB/T 17626.4

4 Surge (impact) GB/T 17626.5

5 Voltage dips, short interruptions and voltage changes GB/T 17626.11

7.3 Electrical safety

The electrical safety requirements are as follows.

a) Electric energy substitute equipment should have reliable electrical insulation performance, between live circuits and live circuits in equipment with voltage levels of 1kV and below the insulation resistance between the road and the ground should generally be no less than 1Mohm, and the insulation resistance to the ground of the equipment with a voltage level of 1kV<U<=35kV is general should not be less than U Mohm;

b) The electrical safety performance of electric energy substitute equipment should meet the requirements of GB 5226.1;

c) There should be a reliable electrical connection between the metal shell of the electric energy substitution equipment or the metal parts that may be charged and the grounding terminal, and the the grounding resistance and connection form of the grounding device should meet the requirements of GB 50065;

d) Electric energy substitute equipment should be equipped with over-current, leakage, over-voltage, and lack of equal protection according to the connection situation.

7.4 Efficiency

Electric energy substitution equipment should comply with the current national standard equipment/product efficiency regulations, and high-efficiency equipment is recommended to improve energy conversion and utilization.

Use efficiency, prohibit the use of obsolete equipment specified by the state.

9.1 Data communication

9.1.1 Communication interface

The communication interface between the power grid replacement equipment and the information interaction of the grid should adopt the standard interface of national or industry standards.

9.1.2 Data transmission error rate

The bit error rate of data transmission of the power substitution equipment connected to the power grid and the power grid information interaction shall meet the requirements of DL/T 698.31.

9.1.3 Communication protocol

The communication protocol for the power substitution equipment connected to the power grid and the power grid information interaction shall meet the requirements of GB/T 31960.03.

9.2 Information Security Protection

When the information of the power substitute equipment connected to the grid interacts with the grid information, the safety protection requirements are as follows.

a) Safety isolation measures must be adopted to ensure grid data security;

b) Hardware or software security modules approved by the National Cryptography Administration should be used to realize data encryption and decryption;

c) The hardware or software security module should support symmetric key algorithm or asymmetric key algorithm, and the key algorithm adopts international and national standards Algorithms specified and certified internationally and nationally.