Dttn-dt2-pc-met-el-0004 A Method statement for inverter And Transformer Installation And Commissioning
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DAU TIENG TAY NINH ENERGY JOINT STOCK COMPANY
METHOD STATEMENT FOR INVERTER AND TRANSFORMER INSTALLATION AND COMMISSIONING
THIS DOCUMENT IS INTENDED FOR USE FOR 200 MWac (DT2) Photovoltaic Solar Power Plant in Vietnam
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 1 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV. A
DATE: 08-DEC-2018
REVISION RECORD REV.
DATE
ORIGINATOR
REVIEWED
APPROVED
A
08-12-2018
Zhou Lu
Ye ZhiJiang
Zou Han
DESCRIPTION ISSUED FOR REVIEW & APPROVAL
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 2 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
TABLE OF CONTENTS
1. INTRODUCTION 2. OBJECTIVE OF METHOD STATEMENT 3. SCOPE OF WORK 4. EQUIPMENT AND TOOLS 5. PROCEDURE 5.1 INVERTER INSTALLATION 5.2 INVERTER COMMISSIONING 5.3 TRANSFORMER INSTALLATION 5.4 TRANSFORMER COMMISSIONING 6. HEALTH, SAFETY AND ENVIROMENT
4 4 4 5 5 5 7 9 11 12
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 3 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
1. INTRODUCTION Project is 200MWac (DT2) photovoltaic solar power plant located about 20km away from Tay Ninh City to the northwest through Provincial Road No. 785 / DT785, about 80km away from Ho Chi Minh City. Existing traffic road to the project is relatively convenient, and there is local road to the site area. Location of the project is shown in an image below.
Figure No.1 Location of the project
2. OBJECTIVE OF METHOD STATEMENT The objective of this method statement is to describe the procedures of installation and commissioning of inverter and transformer. 3. SCOPE OF WORK This procedure covers the general process, methods, equipment and material preparation for installation and commissioning of inverter and transformer.
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 4 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
4. EQUIPMENT AND TOOLS • Inverter • Transformer • Electrical Power Testers • Insulation Resistance Testers • Digital Multimeters • Commissioning and Safety Testers • IV Curve Tracers • Power Tools 5. PROCEDURE 5.1 Inverter installation 5.1.1 Conditions 1. Check the size of the reserved hole of the cable of the foundation cap to meet the requirements of the inverter. The steel ladder frame should be completed. When decorating, it may damage the installed equipment or the equipment can no longer be decorated after installation. Make sure that the protective fence is to be carried out after the inverter has been leveled and fixed. 2. The formwork and scaffolding that are obstructed by the installation should be removed. The site should be cleaned to eliminate the safety hazards such as obvious exposed ribs on the platform and the protruding head of the steel bar. 3. The position and size of the embedded parts and reserved holes such as grounding should meet the design requirements. The embedded parts should be firm. The grounded flat steel should be connected to the two marked grounding points of the box. For example, the monitoring probe of video monitoring is on the inverter base platform. The standard section is responsible for the video monitoring cable tube pre-buried to meet the design requirements. The grounding of the bottom of the monitoring rod should be connected with the grounding of the plant, and the grounding meets the relevant grounding requirements of video monitoring. 4. The foundation grounding of the inverter cap should be constructed according to the figure and integrated with the grounding system of the plant. The grounding resistance should meet the requirements of the specification, and a test report of grounding conduction should be issued. 5. Check that the model and specifications of the installed inverter should be correct; the appearance of the inverter is in good condition. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 5 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
6. The equipment for transportation and seating should be ready and meet the load requirements. 7. When the large inverter is in place, the road should be checked and there is enough space. 8. Steel platform construction and safety inspection should be completed. 5.1.2 Inverter construction and installation method 1. Inverters with basic steel fixed, the allowable deviation of the installation of the inverter base steel shall comply with the following table. Allowable deviation of inverter basic steel installation Allowable deviation Item Not Straight Level Position error and nonparallelism
mm/m
mm in Full Length
<1
<3
<1
<3
—
<3
2. After the basic steel is installed, the top of the steel should be 10mm higher than the flat surface. The basic section steel should have a clear and reliable grounding. 3. The installation direction of the inverter should meet the design requirements. 4. The fixing between the inverter and the basic section steel should be firm and reliable. 5. Before the wiring of the AC side of the inverter, check the cable insulation and verify the phase sequence and polarity of the cable. Before connecting the DC side cable of the inverter, it must be confirmed that there is a clear disconnection point on the side of the combiner box; before the wiring of the AC output side of the inverter, it must be confirmed that the DC switch cabinet of the combiner box and the low-voltage side of the box have obvious disconnection points. 6. The external power supply access point of the complete low-voltage distribution box of the inverter shall meet the design requirements and the requirements of the owner. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 6 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
7. The collection line and AC outlet of the DC cabinet of the inverter should be obviously reserved in the bridge at the lower part of the inverter foundation cap. The reserved amount should meet the needs of the secondary repair and replacement cable joint. . 8. The lower wiring of the inverter and the box change should be in the bridge. The bridge should be laid neatly, regularly and beautifully. The upper elbow should meet the turning radius requirement of the AC/DC cable section. 9. The communication cable laying and connection between the inverter and the booster station is responsible for the labeling, and the external power supply of the inverter is implemented by the standard segment. 10. After the cable is connected, the reserved holes and cable nozzles of the inverter body should be fireproofed. 11. After the inverter is installed, it should be tested by the electrical connection between the combiner box and the inverter, the inverter and the low-voltage side of the box. 12. The installation of the signage shall be completed before the inverter is powered, and the signage shall meet the operation and maintenance requirements of the power station. 5.2 Inverter Commissioning 5.2.1 Conditions for inverter commissioning 1. The inverter control power supply should have input conditions. 2. The DC side and AC side cables of the inverter should be connected, and the polarity (phase sequence) is correct and the insulation is good. 3. Square array wiring should be correct, with the conditions to provide DC power to the inverter. 5.2.2 Inspection before inverter commissioning 1. The grounding of the inverter should be firm and reliable, and the conduction is good. 2. The internal components of the inverter should be intact and free of moisture and discharge marks.
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 7 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
3. All cable connection bolts, plug-ins and terminals inside the inverter should be connected firmly and without looseness. 4. When the inverter body is equipped with a manual opening device, its operation should be flexible and reliable, good contact, and the switch position indication is correct. 5. The inverter body and each circuit mark should be clear and accurate. 6. There should be no debris inside the inverter and it should be cleaned. 5.2.3 Inverter commissioning requirements 1. When the inverter control loop is energized, the following checks should be made: a. The working status indicator and the display of the man-machine interface should be normal. b. The setting of each parameter on the man-machine interface should be correct. c. The heat sink should work normally. 2. When the DC side of the inverter is charged and the AC side is not charged, the following work should be performed: a. The deviation between the measured DC side voltage value and the display unit's display value should be within the allowable range. b. Check the man-machine interface to show that the DC side impedance to ground should meet the requirements. 3. When the DC side of the inverter is energized and the AC side is energized, when the grid connection conditions are met, the following work should be performed: a. The deviation between the measured AC side voltage value and the manmachine interface display value should be within the allowable range; the AC side voltage and frequency should be within the rated range of the inverter, and the phase sequence is correct. b. Inverter with threshold lock function. When the inverter door is open, it should not be connected to the grid. 4. After the inverter is connected to the grid, the inverter should trip and be de-listed under the following test conditions: a. Inverter with threshold lock function, open the inverter door. b. The AC side of the inverter is powered down. c. The DC-to-ground impedance of the inverter is lower than the protection set value. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 8 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
d. e. f. g. h.
The DC input voltage of the inverter is higher or lower than the setting value of the inverter. Inverter DC input over current. The voltage on the AC side of the inverter is outside the allowable range of the rated voltage. The frequency of the AC side of the inverter exceeds the allowable range of the rated frequency; The current imbalance on the AC side of the inverter is outside the set range.
5.3 22KV box transformer installation 5.3.1 Conditions 1. Check the size of the reserved hole of the cable of the foundation cap to meet the technical requirements of the box change. The platform steel ladder should be completed. 2. When decorating, it may damage the installed equipment or the equipment can’t be decorated after installation. Make sure that the protective fence is to be carried out after the box has been lifted and leveled. 3. The formwork and scaffolding that are obstructed by the installation should be removed, the site should be cleaned, and the safety hazards such as obvious exposed ribs on the platform and the protruding head of the steel bar should be excluded. 4. The components should reach the strength allowed for installation, and the quality of the welded components should meet the requirements. 5. The position and size of the embedded parts and reserved holes such as grounding should meet the design requirements. The embedded parts should be firm. The grounded flat steel should be connected with the two marked grounding points of the box. For example, the monitoring probe of video monitoring is on the box-based basic platform. This standard section is responsible for the grounding of the bottom of the monitoring rod and the grounding of the plant. The grounding resistance is required to meet the relevant requirements of video surveillance. 6. The foundation grounding of the box change cap should be constructed according to the figure and integrated with the grounding system of the plant. The grounding resistance should meet the requirements of the specification, and there should be a grounding test report. 7. Check that the model and specifications of the installation box are correct; the appearance of the box is in good condition. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 9 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
8. The equipment for transportation and seating should be ready and meet the load requirements. 9. When the box is in place, the road should be checked and there is enough lifting space. 10. Steel platform construction and safety inspection should be completed. 5.3.2 Installation method 1. The box-type steel fixed box change, the allowable deviation of the basic section steel installation should meet the requirements of the following table. Allowable deviation of box-type basic steel installation Allowable deviation Item Not straight Level Position error and nonparallelism
mm/m
mm in full length
<1
<3
<1
<3
—
<3
2. After the basic steel is installed, the top of the steel should be 10mm higher than the flat surface. The basic section steel should have a clear and reliable grounding. 3. The installation direction of the 3 boxes shall comply with the design regulations. 4. The fixing between the box and the basic steel should be firm and reliable. 5. Before connecting the cable to the side of the box, it must be confirmed that the AC output side of the inverter and the high voltage side of the box have obvious disconnection points. 6. If the external power supply of the complete low-voltage distribution box with box change is connected, the design requirements and the owner's requirements shall prevail. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 10 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
7. The low-voltage side cable and box connected from the inverter side should be obviously reserved in the lower bridge of the foundation cap. The reserved amount should meet the needs of the secondary repair and replacement cable joint. 8. The box change and the lower trace of the inverter should be in the bridge. The bridge should be laid neatly, regularly and beautifully. The upper elbow should meet the turning radius requirement of the cross section of the AC and DC cable. 9. The communication cable laying and connection of the box change and booster station is responsible for the labeling and connection. 10. After the cable is connected, the reserved holes and cable nozzles of the box change body shall be fireproofed. 11. After the installation of the box is completed, it shall pass the electrical connection test of the box change and the inverter, the box change and the box change, the box change and the 35kV switch cabinet of the booster station. 12. The installation of the signage shall be completed before the box is changed to live operation, and the signage shall meet the operation and maintenance requirements of the power station. 13. The accidental oil pool of the box change should be installed at the bottom of the platform. 5.4 Transformer Commissioning 5.4.1 The commissioning contents of the box transformer include: 1. Insulating oil test; 2. Measuring the DC resistance of the winding together with the bushing; 3. Check the voltage ratio of all taps; 4. Check the three-phase wiring group of the transformer; 5. Measuring the insulation resistance of the iron core and the clamp member; 6. Test of non-pure porcelain casing; 7. Inspection and test of the on-load voltage regulating switching device;
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 11 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
8. measuring the insulation resistance, absorption ratio or polarization index of the winding together with the bushing; 9. measuring the dielectric loss factor (tan δ) and capacitance of the winding together with the bushing; 10. Transformer winding deformation test; 11. AC withstand voltage test of the winding together with the bushing; 12. Long-term induced voltage test of the winding together with the bushing with partial discharge measurement; 13. Impact closing test at rated voltage; 14. Check the phase; 15. Measure noise. 5.4.2 Test Items of Load Switch and HV Fuse The test items of load switch and high voltage fuse shall include the following contents: 1. measuring the insulation resistance; 2. measuring the DC resistance of the high-voltage current limiting fuse tube fuse; 3. measuring the resistance of the conductive circuit of the load switch; 4. AC withstand voltage test; 5. check the minimum operating voltage of the operating mechanism coil; 6. Test of the operating mechanism.
6. HEALTH, SAFETY AND ENVIROMENT Full care and precaution shall be given by field management for safety and sanitation of the workmen in field to prevent accident during the execution of work. One of main aspects of this procedure is safety and health control. This is to control prevention of ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 12 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
incidents, personal injuries as well as damaged to equipment and properties during the entire construction period. In order to ensure a safety working environment during the entire construction period, the following safety measures shall be implemented as follow: 1- Health, safety analysis Administrative control shall be applied for use to reduce potential of heat stress e.g. provision rest shelter recovery area or stand by vehicle for each group. Each worker shall be provided with drinking water during hot weather conditions during working hours. All worker shall be provided with and wear personal protective equipment (PPE): safety helmet, safety glasses, safety shoes and long sleeve shirt. When working at height full body harness should be provide. All equipment and hand tools shall be checked in good working condition daily before use, handmade tools are unacceptable. 15 minutes prior to works finish time, all working areas shall be clean of all debris and disposed of designated garbage containers or areas provided by project. The scaffold after installation should be check carefully by qualified personal. All hot work (welding, gas cutting) should be provided fire extinguisher. 2- Environment All diesel generator, portable machine shall have oil spill pan located to contain any oil spilled.
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 13 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
METHOD STATEMENT FOR INVERTER AND TRANSFORMER INSTALLATION AND COMMISSIONING
THIS DOCUMENT IS INTENDED FOR USE FOR 200 MWac (DT2) Photovoltaic Solar Power Plant in Vietnam
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 1 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV. A
DATE: 08-DEC-2018
REVISION RECORD REV.
DATE
ORIGINATOR
REVIEWED
APPROVED
A
08-12-2018
Zhou Lu
Ye ZhiJiang
Zou Han
DESCRIPTION ISSUED FOR REVIEW & APPROVAL
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 2 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
TABLE OF CONTENTS
1. INTRODUCTION 2. OBJECTIVE OF METHOD STATEMENT 3. SCOPE OF WORK 4. EQUIPMENT AND TOOLS 5. PROCEDURE 5.1 INVERTER INSTALLATION 5.2 INVERTER COMMISSIONING 5.3 TRANSFORMER INSTALLATION 5.4 TRANSFORMER COMMISSIONING 6. HEALTH, SAFETY AND ENVIROMENT
4 4 4 5 5 5 7 9 11 12
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 3 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
1. INTRODUCTION Project is 200MWac (DT2) photovoltaic solar power plant located about 20km away from Tay Ninh City to the northwest through Provincial Road No. 785 / DT785, about 80km away from Ho Chi Minh City. Existing traffic road to the project is relatively convenient, and there is local road to the site area. Location of the project is shown in an image below.
Figure No.1 Location of the project
2. OBJECTIVE OF METHOD STATEMENT The objective of this method statement is to describe the procedures of installation and commissioning of inverter and transformer. 3. SCOPE OF WORK This procedure covers the general process, methods, equipment and material preparation for installation and commissioning of inverter and transformer.
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 4 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
4. EQUIPMENT AND TOOLS • Inverter • Transformer • Electrical Power Testers • Insulation Resistance Testers • Digital Multimeters • Commissioning and Safety Testers • IV Curve Tracers • Power Tools 5. PROCEDURE 5.1 Inverter installation 5.1.1 Conditions 1. Check the size of the reserved hole of the cable of the foundation cap to meet the requirements of the inverter. The steel ladder frame should be completed. When decorating, it may damage the installed equipment or the equipment can no longer be decorated after installation. Make sure that the protective fence is to be carried out after the inverter has been leveled and fixed. 2. The formwork and scaffolding that are obstructed by the installation should be removed. The site should be cleaned to eliminate the safety hazards such as obvious exposed ribs on the platform and the protruding head of the steel bar. 3. The position and size of the embedded parts and reserved holes such as grounding should meet the design requirements. The embedded parts should be firm. The grounded flat steel should be connected to the two marked grounding points of the box. For example, the monitoring probe of video monitoring is on the inverter base platform. The standard section is responsible for the video monitoring cable tube pre-buried to meet the design requirements. The grounding of the bottom of the monitoring rod should be connected with the grounding of the plant, and the grounding meets the relevant grounding requirements of video monitoring. 4. The foundation grounding of the inverter cap should be constructed according to the figure and integrated with the grounding system of the plant. The grounding resistance should meet the requirements of the specification, and a test report of grounding conduction should be issued. 5. Check that the model and specifications of the installed inverter should be correct; the appearance of the inverter is in good condition. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 5 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
6. The equipment for transportation and seating should be ready and meet the load requirements. 7. When the large inverter is in place, the road should be checked and there is enough space. 8. Steel platform construction and safety inspection should be completed. 5.1.2 Inverter construction and installation method 1. Inverters with basic steel fixed, the allowable deviation of the installation of the inverter base steel shall comply with the following table. Allowable deviation of inverter basic steel installation Allowable deviation Item Not Straight Level Position error and nonparallelism
mm/m
mm in Full Length
<1
<3
<1
<3
—
<3
2. After the basic steel is installed, the top of the steel should be 10mm higher than the flat surface. The basic section steel should have a clear and reliable grounding. 3. The installation direction of the inverter should meet the design requirements. 4. The fixing between the inverter and the basic section steel should be firm and reliable. 5. Before the wiring of the AC side of the inverter, check the cable insulation and verify the phase sequence and polarity of the cable. Before connecting the DC side cable of the inverter, it must be confirmed that there is a clear disconnection point on the side of the combiner box; before the wiring of the AC output side of the inverter, it must be confirmed that the DC switch cabinet of the combiner box and the low-voltage side of the box have obvious disconnection points. 6. The external power supply access point of the complete low-voltage distribution box of the inverter shall meet the design requirements and the requirements of the owner. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 6 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
7. The collection line and AC outlet of the DC cabinet of the inverter should be obviously reserved in the bridge at the lower part of the inverter foundation cap. The reserved amount should meet the needs of the secondary repair and replacement cable joint. . 8. The lower wiring of the inverter and the box change should be in the bridge. The bridge should be laid neatly, regularly and beautifully. The upper elbow should meet the turning radius requirement of the AC/DC cable section. 9. The communication cable laying and connection between the inverter and the booster station is responsible for the labeling, and the external power supply of the inverter is implemented by the standard segment. 10. After the cable is connected, the reserved holes and cable nozzles of the inverter body should be fireproofed. 11. After the inverter is installed, it should be tested by the electrical connection between the combiner box and the inverter, the inverter and the low-voltage side of the box. 12. The installation of the signage shall be completed before the inverter is powered, and the signage shall meet the operation and maintenance requirements of the power station. 5.2 Inverter Commissioning 5.2.1 Conditions for inverter commissioning 1. The inverter control power supply should have input conditions. 2. The DC side and AC side cables of the inverter should be connected, and the polarity (phase sequence) is correct and the insulation is good. 3. Square array wiring should be correct, with the conditions to provide DC power to the inverter. 5.2.2 Inspection before inverter commissioning 1. The grounding of the inverter should be firm and reliable, and the conduction is good. 2. The internal components of the inverter should be intact and free of moisture and discharge marks.
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 7 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
3. All cable connection bolts, plug-ins and terminals inside the inverter should be connected firmly and without looseness. 4. When the inverter body is equipped with a manual opening device, its operation should be flexible and reliable, good contact, and the switch position indication is correct. 5. The inverter body and each circuit mark should be clear and accurate. 6. There should be no debris inside the inverter and it should be cleaned. 5.2.3 Inverter commissioning requirements 1. When the inverter control loop is energized, the following checks should be made: a. The working status indicator and the display of the man-machine interface should be normal. b. The setting of each parameter on the man-machine interface should be correct. c. The heat sink should work normally. 2. When the DC side of the inverter is charged and the AC side is not charged, the following work should be performed: a. The deviation between the measured DC side voltage value and the display unit's display value should be within the allowable range. b. Check the man-machine interface to show that the DC side impedance to ground should meet the requirements. 3. When the DC side of the inverter is energized and the AC side is energized, when the grid connection conditions are met, the following work should be performed: a. The deviation between the measured AC side voltage value and the manmachine interface display value should be within the allowable range; the AC side voltage and frequency should be within the rated range of the inverter, and the phase sequence is correct. b. Inverter with threshold lock function. When the inverter door is open, it should not be connected to the grid. 4. After the inverter is connected to the grid, the inverter should trip and be de-listed under the following test conditions: a. Inverter with threshold lock function, open the inverter door. b. The AC side of the inverter is powered down. c. The DC-to-ground impedance of the inverter is lower than the protection set value. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 8 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
d. e. f. g. h.
The DC input voltage of the inverter is higher or lower than the setting value of the inverter. Inverter DC input over current. The voltage on the AC side of the inverter is outside the allowable range of the rated voltage. The frequency of the AC side of the inverter exceeds the allowable range of the rated frequency; The current imbalance on the AC side of the inverter is outside the set range.
5.3 22KV box transformer installation 5.3.1 Conditions 1. Check the size of the reserved hole of the cable of the foundation cap to meet the technical requirements of the box change. The platform steel ladder should be completed. 2. When decorating, it may damage the installed equipment or the equipment can’t be decorated after installation. Make sure that the protective fence is to be carried out after the box has been lifted and leveled. 3. The formwork and scaffolding that are obstructed by the installation should be removed, the site should be cleaned, and the safety hazards such as obvious exposed ribs on the platform and the protruding head of the steel bar should be excluded. 4. The components should reach the strength allowed for installation, and the quality of the welded components should meet the requirements. 5. The position and size of the embedded parts and reserved holes such as grounding should meet the design requirements. The embedded parts should be firm. The grounded flat steel should be connected with the two marked grounding points of the box. For example, the monitoring probe of video monitoring is on the box-based basic platform. This standard section is responsible for the grounding of the bottom of the monitoring rod and the grounding of the plant. The grounding resistance is required to meet the relevant requirements of video surveillance. 6. The foundation grounding of the box change cap should be constructed according to the figure and integrated with the grounding system of the plant. The grounding resistance should meet the requirements of the specification, and there should be a grounding test report. 7. Check that the model and specifications of the installation box are correct; the appearance of the box is in good condition. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 9 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
8. The equipment for transportation and seating should be ready and meet the load requirements. 9. When the box is in place, the road should be checked and there is enough lifting space. 10. Steel platform construction and safety inspection should be completed. 5.3.2 Installation method 1. The box-type steel fixed box change, the allowable deviation of the basic section steel installation should meet the requirements of the following table. Allowable deviation of box-type basic steel installation Allowable deviation Item Not straight Level Position error and nonparallelism
mm/m
mm in full length
<1
<3
<1
<3
—
<3
2. After the basic steel is installed, the top of the steel should be 10mm higher than the flat surface. The basic section steel should have a clear and reliable grounding. 3. The installation direction of the 3 boxes shall comply with the design regulations. 4. The fixing between the box and the basic steel should be firm and reliable. 5. Before connecting the cable to the side of the box, it must be confirmed that the AC output side of the inverter and the high voltage side of the box have obvious disconnection points. 6. If the external power supply of the complete low-voltage distribution box with box change is connected, the design requirements and the owner's requirements shall prevail. ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 10 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
7. The low-voltage side cable and box connected from the inverter side should be obviously reserved in the lower bridge of the foundation cap. The reserved amount should meet the needs of the secondary repair and replacement cable joint. 8. The box change and the lower trace of the inverter should be in the bridge. The bridge should be laid neatly, regularly and beautifully. The upper elbow should meet the turning radius requirement of the cross section of the AC and DC cable. 9. The communication cable laying and connection of the box change and booster station is responsible for the labeling and connection. 10. After the cable is connected, the reserved holes and cable nozzles of the box change body shall be fireproofed. 11. After the installation of the box is completed, it shall pass the electrical connection test of the box change and the inverter, the box change and the box change, the box change and the 35kV switch cabinet of the booster station. 12. The installation of the signage shall be completed before the box is changed to live operation, and the signage shall meet the operation and maintenance requirements of the power station. 13. The accidental oil pool of the box change should be installed at the bottom of the platform. 5.4 Transformer Commissioning 5.4.1 The commissioning contents of the box transformer include: 1. Insulating oil test; 2. Measuring the DC resistance of the winding together with the bushing; 3. Check the voltage ratio of all taps; 4. Check the three-phase wiring group of the transformer; 5. Measuring the insulation resistance of the iron core and the clamp member; 6. Test of non-pure porcelain casing; 7. Inspection and test of the on-load voltage regulating switching device;
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 11 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
8. measuring the insulation resistance, absorption ratio or polarization index of the winding together with the bushing; 9. measuring the dielectric loss factor (tan δ) and capacitance of the winding together with the bushing; 10. Transformer winding deformation test; 11. AC withstand voltage test of the winding together with the bushing; 12. Long-term induced voltage test of the winding together with the bushing with partial discharge measurement; 13. Impact closing test at rated voltage; 14. Check the phase; 15. Measure noise. 5.4.2 Test Items of Load Switch and HV Fuse The test items of load switch and high voltage fuse shall include the following contents: 1. measuring the insulation resistance; 2. measuring the DC resistance of the high-voltage current limiting fuse tube fuse; 3. measuring the resistance of the conductive circuit of the load switch; 4. AC withstand voltage test; 5. check the minimum operating voltage of the operating mechanism coil; 6. Test of the operating mechanism.
6. HEALTH, SAFETY AND ENVIROMENT Full care and precaution shall be given by field management for safety and sanitation of the workmen in field to prevent accident during the execution of work. One of main aspects of this procedure is safety and health control. This is to control prevention of ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 12 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
incidents, personal injuries as well as damaged to equipment and properties during the entire construction period. In order to ensure a safety working environment during the entire construction period, the following safety measures shall be implemented as follow: 1- Health, safety analysis Administrative control shall be applied for use to reduce potential of heat stress e.g. provision rest shelter recovery area or stand by vehicle for each group. Each worker shall be provided with drinking water during hot weather conditions during working hours. All worker shall be provided with and wear personal protective equipment (PPE): safety helmet, safety glasses, safety shoes and long sleeve shirt. When working at height full body harness should be provide. All equipment and hand tools shall be checked in good working condition daily before use, handmade tools are unacceptable. 15 minutes prior to works finish time, all working areas shall be clean of all debris and disposed of designated garbage containers or areas provided by project. The scaffold after installation should be check carefully by qualified personal. All hot work (welding, gas cutting) should be provided fire extinguisher. 2- Environment All diesel generator, portable machine shall have oil spill pan located to contain any oil spilled.
ORIGINATOR: SINOHYDRO CORPORATION LIMITED
Page 13 of 13 DOC. No. DTTN-DT2-PC-MET-EL-0004 A
PROJECT No. DTTN
REV.A
DATE: 08-DEC-2018
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