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DL/T 5155-2016: Technical code for design AC station service of 220kV ~ 1000kV substation
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DL/T 5155-2016: Technical code for design AC station service of 220kV ~ 1000kV substation

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POWER INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.100 P 62 Registration number. J173-2016 P DL/T 5155-2016 Replacing DL/T 5155-2002 Technical code for design AC station service of 220kV ~ 1000kV substation Issued on. AUGUST 16, 2016 Implemented on. DECEMBER 01, 2016 Issued by. National Energy Administration POWER INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Technical code for design AC station service of 220kV ~ 1000kV substation Replacing DL/T 5155-2002 Main drafting organization. Electrical Planning and Design Institute Approved by. National Energy Administration Date of implementation. December 01, 2016 2016 Beijing ...

Table of Contents

Foreword... 6 1 General provisions... 8 2 Terms... 8 3 Station service system wiring... 9 4 Station service load analysis... 13 5 Choice of station service transformer... 14 6 Short-circuit current calculation and choice of electrical equipment and conductors... 15 7 Station service equipment arrangement... 20 8 Maintenance power supply... 26 9 Protection against electric shock... 26 10 Control, signaling, metering and automatic devices of station service system ... 27 Appendix A Load characteristic table... 30 Appendix B Voltage-regulation calculation... 32 Appendix C Calculation of short-circuit current in 380V power centers... 35 Appendix D 380V feeder working current calculation... 38 Appendix E Selection and verification of protect device and conductor... 41 Explanation of wording in this code... 46 List of quoted standards... 47 Foreword... 7 1 General provisions... 9 2 Terms... 9 3 Station service system wiring... 10 3.1 Station service power supply... 10 3.2 Load classification... 11 3.3 Power supply manner... 12 3.4 Power supply connection... 13 3.5 Application of neutral grounding in auxiliary power system... 13 3.6 AC uninterruptible power supply... 14 4 Station service load analysis... 14 4.1 Principles of load calculations... 14 4.2 Load account procedure... 15 5 Choice of station service transformer... 15 6 Short-circuit current calculation and choice of electrical equipment and conductors... 16 6.1 Short-circuit current calculation... 16 6.2 High-voltage switchyard... 17 6.3 Station service low-voltage equipment... 17 6.4 Choice of conductor... 21 6.5 Diesel-engine generators... 21 7 Station service equipment arrangement... 21 7.1 General requirements... 21 7.2 Arrangement of station service transformer... 22 7.3 Arrangement of switchboard... 23 7.4 Arrangement of diesel-engine generator... 25 7.5 Clean energy and energy storage device... 26 7.6 Requirements for constructions... 26 8 Maintenance power supply... 27 9 Protection against electric shock... 27 10 Control, signaling, metering and automatic devices of station service system ... 28 10.1 Station service power relay... 28 10.2 Station service power control, signaling and measure device... 29 10.3 Metering system... 30 10.4 Power automatic transfer switching equipment... 30 Appendix A Load characteristic table... 31 Appendix B Voltage-regulation calculation... 33 Appendix C Calculation of short-circuit current in 380V power centers... 36 Appendix D 380V feeder working current calculation... 39 Appendix E Selection and verification of protect device and conductor... 42 Explanation of wording in this code... 47 List of quoted standards... 48

1 General provisions

1.0.1 In order to make the station service design of the substation meet the national technical and economic policies, safe, reliable, economical, in line with national conditions, it hereby develops this standard. 1.0.2 This standard is applicable to the design of the AC station service system for the newly built, extended, reconstructed 220kV ~ 1000kV substation, switch station, series compensation station. 1.0.3 Station service design shall use energy-saving, environmentally friendly, safe, reliable electrical products which are in line with national standards. 1.0.4 The design of the station service system shall be based on the characteristics and scale of the project, combining the recent period and future, to meet the short-term needs while meeting the long-term requirements. 1.0.5 In addition to complying with the provisions of this standard, the design of station service power shall also comply with the relevant national standards.

2 Terms

2.0.1 Power supply AC power supply for long-term supply for the working load in the substation. 2.0.2 Standby supply AC power supply which supplies power only when the power supply in the substation is cut off. 2.0.3 Emergency power supply An AC power supply that supplies power to the load which, in case of power failure within a limited period of time, may affect the safety of the person or cause the significant decrease of power delivery of the substation.

3 Station service system wiring

3.1 Station service power supply 3.1.4 The switchyard should connect 2 reliable power supplies from the outside of the station. When there is a high-voltage shunt reactor in the station, one circuit may use a high anti-extraction power supply. The configuration of the power supply for the series compensation station shall be carried out in accordance with the relevant provisions of the current power industry standard "Technical code for design of series compensator station" DL/T 5453. 3.2 Load classification 3.2.1 Station service power load may be divided into the following three categories according to the impact of power outage. Type-I load. The load which, in case of short-term power outages, may affect the safety of the person or equipment, cause the production run to stop or the main transformer to reduce the load; 3.3 Power supply manner 3.3.1 The station service power load should be directly supplied by the station service switchboard. For the important load, it shall use the double-loop power supply mode which are respectively connected to two busbars, respectively. 3.3.3 Forced cooling device, loaded voltage-regulating device and its charged oil filtering device of main transformer and high-voltage shunt reactor should adopt the mutual-standby dual power supply according to the following methods, meanwhile the automatic mutual switchover is only achieved in the control box of the cooling device. 3.4 Power supply connection 3.4.1 The station service power supply for the 330kV ~ 750kV substation should use the one-stage voltage-reduction mode. The station service power supply for the 1000kV substation shall, according to the voltage level at the low-voltage side of the main transformer, select the two-stage voltage-reduction mode or one-stage voltage-reduction mode. When using the two-stage voltage- reduction mode, the middle voltage level should be consistent with the voltage level of the power supply outside the station. The high-voltage station service power supply should use the wiring method of independent-wired transformer set.

4 Station service load analysis

4.1 Principles of load calculations 4.1.1 Equipment that is continuously operated and often short-term operated shall be calculated. 4.2 Load account procedure 4.2.1 Station service load is calculated by the following formula.

5 Choice of station service transformer

5.0.1 The capacity of the station service transformer shall be greater than the maximum calculated capacity of the whole station. 5.0.4 The impedance of the station service transformer shall be determined according to the ability of the low-voltage electrical appliance to withstand the short-circuit current. It should use a transformer of the standard impedance series. 5.0.5 The rated voltage of the high-voltage side of the station service transformer shall be determined according to the actual operating voltage of the access point. It should take the rated voltage of the main transformer corresponding to the access point. 5.0.6 When the voltage of the high-voltage power supply fluctuates greatly, which always make the voltage deviation of the station service busbar to be more than ±5%, it shall use the loaded voltage-regulated station service transformer. The voltage-regulation calculation of station service power shall comply with the provisions of Appendix B of this standard.

6 Short-circuit current calculation and choice of electrical equipment and conductors

6.1 Short-circuit current calculation 6.1.1 The short-circuit current of the high-voltage side of the station service can be considered according to the three-phase short-circuit current level of the connected busbar. The breaking capacity of the protective device connected behind the device with the finite-current function shall be determined according to the short-circuit current after the current limiting. 6.2 High-voltage switchyard 6.2.1 At the high-voltage side of the station service transformer, it should use the high-voltage circuit breakers as protective device. When the capacity of station service transformer is less than 400kV • A, it may also use fuse protection. When the breaking current of the protective device cannot meet the requirements, it should use the current limiting means which are equipped with the current limiting reactor. 6.3 Station service low-voltage equipment 6.3.1 Low-voltage equipment shall be selected according to the environment it is located, based on the conditions of meeting the working voltage, working current, breaking capacity, dynamic stability, thermal stability requirements, 6.3.2 Station service Low-voltage power distribution should adopt a closed fixed switchboard, or a drawer-type switchboard. When using a drawer-type switchboard, there shall be an electrical or mechanical interlock. 6.3.3 Under the following conditions, the low-voltage electrical appliances and conductors may not be subjected to the verification of dynamic stability or thermal stability. 6.3.7 The low-voltage distribution protection should use low-voltage air breakers. In the three-phase power supply circuit, each pole of the three-pole circuit-breaker shall be equipped with an overcurrent tripper. The parameters of the shunt tripper and the voltage-loss tripper as well as the number of auxiliary contacts shall meet the requirements for control and protection. 6.5 Diesel-engine generators 6.5.1 The diesel generator set shall adopt the fast self-starting emergency type. The time for the first self-starting and restoring the power supply after the power failure may take 15s ~ 20s. The generator set shall have the ability to prepare for self-starting work and can self-start up for three times continuously.

7 Station service equipment arrangement

7.1 General requirements 7.1.1 The location of the power distribution device room for station service shall be close to the center of the power load. The surrounding environment is dry and free from vigorous vibration. 7.1.4 In the station service switchboard room and station service transformer room, all holes leading to the outdoor or adjacent rooms (including the cable layer) shall be reliably sealed by flame-resistant materials. 7.2 Arrangement of station service transformer 7.2.1 When the station service transformer is arranged indoor, the oil-immersed transformer shall be installed in a separate small chamber. Dry-type transformers may be arranged in the station service switchboard room. 7.2.3 The setting of the oil storage or oil retaining facilities of transformers for oil-immersion stations shall be carried out in accordance with the relevant provisions of the current national standard "Code for design of fire protection for fossil fuel power plants and substations" GB 50229. 7.2.5 At the point where the low-voltage hard conductor of the transformer for the oil-immersion station passes through the wall, it may be enclosed by flame- retardant insulation board. At the point where the indoor and outdoor lead line passes through the wall, it shall be subjected to moisture-proof treatment. 7.2.6 When installing the isolation device in the oil-immersed transformer chamber, it shall be installed at the indoor maintenance door of the transformer chamber and shall be shielded. 7.2.7 The transformer chamber shall have a special door or detachable wall for inspection. 7.3 Arrangement of switchboard 7.3.2 The central switchboard room for the station service as set up separately shall be arranged as close as possible to the station service transformer chamber. 7.4 Arrangement of diesel-engine generator 7.4.1 Diesel generators should be arranged in a well-ventilated independent room. 7.4.2 The diesel generator room should be arranged close to the station service power room. 7.4.3 The distance from the diesel generator set to the wall shall meet the requirements for transportation, operation, maintenance. The relevant dimensions in the equipment room shall meet the requirements of Table 7.4.3.

8 Maintenance power supply

8.0.1 Nearby the main transformer, high-voltage shunt reactor, series reactive power compensation device, inside the indoor and outdoor power distribution device, it shall arrange fixed maintenance power supply. 8.0.2 Special power supply box for maintenance shall meet the following requirements.

9 Protection against electric shock

9.0.1 The electric shock protection of the power distribution device for high- voltage station services shall be carried out in accordance with the relevant provisions of the current power industry standard "Technical code for designing high-voltage electrical switchgear" DL/T 5352. 9.0.2 The maintenance power supply for substation and mobile power equipment shall be equipped with residual current action protection device. The rated residual non-operating current of the residual current action protection device shall be more than the expected grounding leakage current when the load is in normal operation. 9.0.5 Between the conductive parts that can be accessed simultaneously in the power distribution room, it shall make equipotential bonding. 10 Control, signaling, metering and automatic devices of station service system DL/T 5155-2016 POWER INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.100 P 62 Registration number. J173-2016 P DL/T 5155-2016 Replacing DL/T 5155-2002 Technical code for design AC station service of 220kV ~ 1000kV substation Issued on. AUGUST 16, 2016 Implemented on. DECEMBER 01, 2016 Issued by. National Energy Administration POWER INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Technical code for design AC station service of 220kV ~ 1000kV substation Replacing DL/T 5155-2002 Main drafting organization. Electrical Planning and Design Institute Approved by. National Energy Administration Date of implementation. December 01, 2016 2016 Beijing ...

Table of Contents

Foreword... 6 1 General provisions... 8 2 Terms... 8 3 Station service system wiring... 9 4 Station service load analysis... 13 5 Choice of station service transformer... 14 6 Short-circuit current calculation and choice of electrical equipment and conductors... 15 7 Station service equipment arrangement... 20 8 Maintenance power supply... 26 9 Protection against electric shock... 26 10 Control, signaling, metering and automatic devices of station service system ... 27 Appendix A Load characteristic table... 30 Appendix B Voltage-regulation calculation... 32 Appendix C Calculation of short-circuit current in 380V power centers... 35 Appendix D 380V feeder working current calculation... 38 Appendix E Selection and verification of protect device and conductor... 41 Explanation of wording in this code... 46 List of quoted standards... 47 Foreword... 7 1 General provisions... 9 2 Terms... 9 3 Station service system wiring... 10 3.1 Station service power supply... 10 3.2 Load classification... 11 3.3 Power supply manner... 12 3.4 Power supply connection... 13 3.5 Application of neutral grounding in auxiliary power system... 13 3.6 AC uninterruptible power supply... 14 4 Station service load analysis... 14 4.1 Principles of load calculations... 14 4.2 Load account procedure... 15 5 Choice of station service transformer... 15 6 Short-circuit current calculation and choice of electrical equipment and conductors... 16 6.1 Short-circuit current calculation... 16 6.2 High-voltage switchyard... 17 6.3 Station service low-voltage equipment... 17 6.4 Choice of conductor... 21 6.5 Diesel-engine generators... 21 7 Station service equipment arrangement... 21 7.1 General requirements... 21 7.2 Arrangement of station service transformer... 22 7.3 Arrangement of switchboard... 23 7.4 Arrangement of diesel-engine generator... 25 7.5 Clean energy and energy storage device... 26 7.6 Requirements for constructions... 26 8 Maintenance power supply... 27 9 Protection against electric shock... 27 10 Control, signaling, metering and automatic devices of station service system ... 28 10.1 Station service power relay... 28 10.2 Station service power control, signaling and measure device... 29 10.3 Metering system... 30 10.4 Power automatic transfer switching equipment... 30 Appendix A Load characteristic table... 31 Appendix B Voltage-regulation calculation... 33 Appendix C Calculation of short-circuit current in 380V power centers... 36 Appendix D 380V feeder working current calculation... 39 Appendix E Selection and verification of protect device and conductor... 42 Explanation of wording in this code... 47 List of quoted standards... 48

1 General provisions

1.0.1 In order to make the station service design of the substation meet the national technical and economic policies, safe, reliable, economical, in line with national conditions, it hereby develops this standard. 1.0.2 This standard is applicable to the design of the AC station service system for the newly built, extended, reconstructed 220kV ~ 1000kV substation, switch station, series compensation station. 1.0.3 Station service design shall use energy-saving, environmentally friendly, safe, reliable electrical products which are in line with national standards. 1.0.4 The design of the station service system shall be based on the characteristics and scale of the project, combining the recent period and future, to meet the short-term needs while meeting the long-term requirements. 1.0.5 In addition to complying with the provisions of this standard, the design of station service power shall also comply with the relevant national standards.

2 Terms

2.0.1 Power supply AC power supply for long-term supply for the working load in the substation. 2.0.2 Standby supply AC power supply which supplies power only when the power supply in the substation is cut off. 2.0.3 Emergency power supply An AC power supply that supplies power to the load which, in case of power failure within a limited period of time, may affect the safety of the person or cause the significant decrease of power delivery of the substation.

3 Station service system wiring

3.1 Station service power supply 3.1.4 The switchyard should connect 2 reliable power supplies from the outside of the station. When there is a high-voltage shunt reactor in the station, one circuit may use a high anti-extraction power supply. The configuration of the power supply for the series compensation station shall be carried out in accordance with the relevant provisions of the current power industry standard "Technical code for design of series compensator station" DL/T 5453. 3.2 Load classification 3.2.1 Station service power load may be divided into the following three categories according to the impact of power outage. Type-I load. The load which, in case of short-term power outages, may affect the safety of the person or equipment, cause the production run to stop or the main transformer to reduce the load; 3.3 Power supply manner 3.3.1 The station service power load should be directly supplied by the station service switchboard. For the important load, it shall use the double-loop power supply mode which are respectively connected to two busbars, respectively. 3.3.3 Forced cooling device, loaded voltage-regulating device and its charged oil filtering device of main transformer and high-voltage shunt reactor should adopt the mutual-standby dual power supply according to the following methods, meanwhile the automatic mutual switchover is only achieved in the control box of the cooling device. 3.4 Power supply connection 3.4.1 The station service power supply for the 330kV ~ 750kV substation should use the one-stage voltage-reduction mode. The station service power supply for the 1000kV substation shall, according to the voltage level at the low-voltage side of the main transformer, select the two-stage voltage-reduction mode or one-stage voltage-reduction mode. When using the two-stage voltage- reduction mode, the middle voltage level should be consistent with the voltage level of the power supply outside the station. The high-voltage station service power supply should use the wiring method of independent-wired transformer set.

4 Station service load analysis

4.1 Principles of load calculations 4.1.1 Equipment that is continuously operated and often short-term operated shall be calculated. 4.2 Load account procedure 4.2.1 Station service load is calculated by the following formula.

5 Choice of station service transformer

5.0.1 The capacity of the station service transformer shall be greater than the maximum calculated capacity of the whole station. 5.0.4 The impedance of the station service transformer shall be determined according to the ability of the low-voltage electrical appliance to withstand the short-circuit current. It should use a transformer of the standard impedance series. 5.0.5 The rated voltage of the high-voltage side of the station service transformer shall be determined according to the actual operating voltage of the access point. It should take the rated voltage of the main transformer corresponding to the access point. 5.0.6 When the voltage of the high-voltage power supply fluctuates greatly, which always make the voltage deviation of the station service busbar to be more than ±5%, it shall use the loaded voltage-regulated station service transformer. The voltage-regulation calculation of station service power shall comply with the provisions of Appendix B of this standard.

6 Short-circuit current calculation and choice of electrical equipment and conductors

6.1 Short-circuit current calculation 6.1.1 The short-circuit current of the high-voltage side of the station service can be considered according to the three-phase short-circuit current level of the connected busbar. The breaking capacity of the protective device connected behind the device with the finite-current function shall be determined according to the short-circuit current after the current limiting. 6.2 High-voltage switchyard 6.2.1 At the high-voltage side of the station service transformer, it should use the high-voltage circuit breakers as protective device. When the capacity of station service transformer is less than 400kV • A, it may also use fuse protection. When the breaking current of the protective device cannot meet the requirements, it should use the current limiting means which are equipped with the current limiting reactor. 6.3 Station service low-voltage equipment 6.3.1 Low-voltage equipment shall be selected according to the environment it is located, based on the conditions of meeting the working voltage, working current, breaking capacity, dynamic stability, thermal stability requirements, 6.3.2 Station service Low-voltage power distribution should adopt a closed fixed switchboard, or a drawer-type switchboard. When using a drawer-type switchboard, there shall be an electrical or mechanical interlock. 6.3.3 Under the following conditions, the low-voltage electrical appliances and conductors may not be subjected to the verification of dynamic stability or thermal stability. 6.3.7 The low-voltage distribution protection should use low-voltage air breakers. In the three-phase power supply circuit, each pole of the three-pole circuit-breaker shall be equipped with an overcurrent tripper. The parameters of the shunt tripper and the voltage-loss tripper as well as the number of auxiliary contacts shall meet the requirements for control and protection. 6.5 Diesel-engine generators 6.5.1 The diesel generator set shall adopt the fast self-starting emergency type. The time for the first self-starting and restoring the power supply after the power failure may take 15s ~ 20s. The generator set shall have the ability to prepare for self-starting work and can self-start up for three times continuously.

7 Station service equipment arrangement

7.1 General requirements 7.1.1 The location of the power distribution device room for station service shall be close to the center of the power load. The surrounding environment is dry and free from vigorous vibration. 7.1.4 In the station service switchboard room and station service transformer room, all holes leading to the outdoor or adjacent rooms (including the cable layer) shall be reliably sealed by flame-resistant materials. 7.2 Arrangement of station service transformer 7.2.1 When the station service transformer is arranged indoor, the oil-immersed transformer shall be installed in a separate small chamber. Dry-type transformers may be arranged in the station service switchboard room. 7.2.3 The setting of the oil storage or oil retaining facilities of transformers for oil-immersion stations shall be carried out in accordance with the relevant provisions of the current national standard "Code for design of fire protection for fossil fuel power plants and substations" GB 50229. 7.2.5 At the point where the low-voltage hard conductor of the transformer for the oil-immersion station passes through the wall, it may be enclosed by flame- retardant insulation board. At the point where the indoor and outdoor lead line passes through the wall, it shall be subjected to moisture-proof treatment. 7.2.6 When installing the isolation device in the oil-immersed transformer chamber, it shall be installed at the indoor maintenance door of the transformer chamber and shall be shielded. 7.2.7 The transformer chamber shall have a special door or detachable wall for inspection. 7.3 Arrangement of switchboard 7.3.2 The central switchboard room for the station service as set up separately shall be arranged as close as possible to the station service transformer chamber. 7.4 Arrangement of diesel-engine generator 7.4.1 Diesel generators should be arranged in a well-ventilated independent room. 7.4.2 The diesel generator room should be arranged close to the station service power room. 7.4.3 The distance from the diesel generator set to the wall shall meet the requirements for transportation, operation, maintenance. The relevant dimensions in the equipment room shall meet the requirements of Table 7.4.3.

8 Maintenance power supply

8.0.1 Nearby the main transformer, high-voltage shunt reactor, series reactive power compensation device, inside the indoor and outdoor power distribution device, it shall arrange fixed maintenance power supply. 8.0.2 Special power supply box for maintenance shall meet the following requirements.

9 Protection against electric shock

9.0.1 The electric shock protection of the power distribution device for high- voltage station services shall be carried out in accordance with the relevant provisions of the current power industry standard "Technical code for designing high-voltage electrical switchgear" DL/T 5352. 9.0.2 The maintenance power supply for substation and mobile power equipment shall be equipped with residual current action protection device. The rated residual non-operating current of the residual current action protection device shall be more than the expected grounding leakage current when the load is in normal operation. 9.0.5 Between the conductive parts that can be accessed simultaneously in the power distribution room, it shall make equipotential bonding. 10 Control, signaling, metering and automatic devices of station service system ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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