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DL/T 348-2019: The patrol inspection guidelines for the converter station
Status: Valid DL/T 348: Evolution and historical versions
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| DL/T 348-2019 | English | 229 |
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The patrol inspection guidelines for the converter station
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DL/T 348-2019
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| DL/T 348-2010 | English | 439 |
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Basic data | Standard ID | DL/T 348-2019 (DL/T348-2019) | | Description (Translated English) | The patrol inspection guidelines for the converter station | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F23 | | Classification of International Standard | 29.240.99 | | Word Count Estimation | 10,179 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Older Standard (superseded by this standard) | DL/T 348-2010 | | Quoted Standard | GB 26860-2011 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies converter transformers and smoothing reactors, converter valves, DC field power distribution devices, AC and DC filters, control and protection equipment, valves for converter stations with voltage levels of ��800kV and below (referred to as converter stations). Inspection items, cycle and requirements of cooling system equipment and valve hall air-conditioning equipment. This standard applies to the inspection work of the above-mentioned converter station equipment, and the inspection of other equipment in the converter station can be carried out with reference to the relevant regulations. | DL/T 348-2019: The patrol inspection guidelines for the converter station---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
The Patrol Inspection Guidelines For The Converter Station
ICS 29.240.99
F 23
People's Republic of China Electric Power Industry Standard
Replace DL/T 348-2010
Guidelines for Equipment Inspection of Converter Stations
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Job requirements...1
4 Inspection classification and cycle...2
5 Routine inspection items and requirements...3
6 Special inspection items and requirements...7
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is a revision of DL/T 348-2010.Compared with the original standard, the following contents are mainly modified.
--Added supplements to the "patrol inspection classification and cycle" and revised some items;
- Routine inspection items for DC field power distribution devices, daily inspection items are added, and weekly inspection items are modified;
--Converter transformer and smoothing reactor routine inspection project, adding dry-type smoothing reactor daily inspection project;
--Converter valve routine inspection items, the original weekly inspection items were changed to daily inspections, and the monthly and annual inspection items were revised;
- Routine inspection items of valve cooling system, daily inspection items of drainage system and air cooling system are added;
- Added routine inspection items for valve hall air conditioning;
--The inspection items for severe weather and geological disasters have been revised to standardize severe rain, strong wind (sand), hail, dense fog, etc.
Weather and earthquake and other geological disaster inspection projects.
After the implementation of this standard, it will replace DL/T 348-2010.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the High Voltage Direct Current Transmission Technology Standardization Technical Committee of the Power Industry.
Drafting organization of this standard. Operation branch of State Grid Corporation of China.
The main drafters of this standard. Hu Feng, Wang Rui, Lei Longfei, Xu Bing, Zeng Qingke, Peng Dong, Zhang Rui, Yang Jin, Lang Zuoyun.
DL/T 348-2010 replaced by this standard was first released on January 9,.2011, and this is the first revision.
The opinions or suggestions during the implementation of this standard will be fed back to the Standardization Center of China Electricity Council (No. 2 Baiguang Road, Xuanwu District, Beijing)
Article No. 1, 100761).
Guidelines for Equipment Inspection of Converter Stations
1 Scope
This guideline specifies the converter transformers and smoothing reactors for converter stations with voltage levels of ±800kV and below (hereinafter referred to as converter stations).
Flow valve, DC field power distribution device, AC and DC filters, control and protection equipment, valve cooling system equipment, inspection items of valve hall air conditioning equipment,
Cycle and requirements.
This guideline applies to the inspection of the above-mentioned converter station equipment, and the inspection of other equipment in the converter station can be carried out with reference to relevant regulations.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB 26860-2011 Electrical Safety Work Rules for the Electrical Part of Power Plants and Substations
3 job requirements
3.1 Basic conditions of the inspection site
a) The converter station shall have a reliable automatic monitoring and alarm system, and a dedicated person shall be assigned to monitor the disk 24 hours a day. Those who do not meet the requirements shall be appropriately increased
Number of inspections.
b) The production site of the converter station shall have complete safety measures and signs, and the construction area in the station shall be reliably isolated from the operation area.
c) In order to ensure the safety of night inspection, the converter station should be equipped with complete equipment area lighting.
d) On-site inspection equipment should be qualified and complete.
e) The converter station should have standard inspection work instructions.
3.2 Basic conditions for inspectors
The inspection personnel should be familiar with the converter station equipment, comply with the provisions of 4.2 in GB 26860-2011, and be approved by the converter station management department.
3.3 General Rules for Inspection
a) When the high-voltage equipment needs to be inspected during thunderstorms, insulated boots should be worn and no lightning arresters and lightning rods should be approached.
b) Inspectors entering the equipment area for inspection must wear safety helmets and keep a safe distance from live equipment. Don't change the temporary
The safety fence shall not be removed or crossed over the permanent fence without authorization.
c) On-site backup converter transformers, smoothing reactors, AC filters, DC filters and high-voltage switchgear in standby state
Inspection should be carried out in accordance with the requirements of operating equipment.
d) The converter station shall make clear regulations on the inspection time, frequency, content, etc. and the relevant regulations shall not be lower than the requirements of this guideline.
e) The inspection status should be recorded in written or electronic documents and signed and confirmed by the inspector immediately.
f) The shift inspection is carried out by the shift on-duty and the on-duty personnel.
4 Inspection classification and cycle
4.1 Inspection classification
a) Routine inspection
Routine inspection refers to the inspection performed by the operation and maintenance personnel on the equipment during the normal operation of the equipment.
b) Special inspection
Special inspection refers to an additional inspection performed under special changes in equipment operating conditions or under specific conditions, including.
a) Inspection after severe weather such as torrential rain, strong wind (sand), hail, dense fog and geological disasters such as earthquake;
b) Inspection during the trial operation of new equipment;
c) The patrol inspection after the equipment is re-commissioned after maintenance, transformation or long-term outage;
d) Inspection of high temperature weather exceeding 35℃, extreme load, equipment overheating or over temperature;
e) Routine inspection when suspicious phenomena or defects are found during equipment operation;
f) Inspection after system shock and equipment accident;
g) Handover inspection;
h) Inspection by production management personnel.
4.2 Inspection cycle
a) Routine inspection cycle
The routine inspection cycle is divided into four types. daily inspection, weekly inspection, monthly inspection, and annual inspection.
b) Special inspection cycle
a) In severe weather such as heavy fog, strong wind, thunderstorm, snow and hail, etc., inspections should be strengthened and continued to be observed until the weather improves;
b) The equipment should be inspected before and after the new operation, at least once a day during the trial operation;
c) Inspections should be carried out before and after the equipment is re-commissioned after maintenance, transformation or long-term shutdown;
d) In the high temperature weather exceeding 35℃, the load is obviously increased, and the equipment is overheated or overheated, the inspection is mainly infrared temperature measurement. Such as continuous high
If the temperature is above 35℃, the temperature of the equipment in the station shall be measured once a day. During overload operation, the relevant equipment in the station shall be checked every 4 hours
Measure the temperature once. When voltage heating equipment is overheated, the temperature shall be measured every two hours until the power failure is checked and handled. Current heating equipment
When the joint is overheated, the temperature shall be measured once a day until the power failure is checked and handled;
e) When suspicious phenomena or defects are found in the operation of the equipment, a reasonable inspection cycle should be established according to the specific conditions to ensure that the equipment can be found in time.
Changes in the abnormal state of the equipment;
f) Inspections should be carried out immediately after system shocks and equipment accidents;
g) The shift inspection is carried out every time the shift is transferred;
h) The main production management personnel of the converter station shall conduct inspections at least once a month, and at least once a week for abnormal or diseased equipment
Times.
5 Routine inspection items and requirements
5.1 Converter transformer and smoothing reactor
a) Daily inspection content includes.
a) The sound is uniform and normal, no abnormal vibration, no oil leakage or oil leakage at all parts, no deformation, rust, and no abnormal discharge phenomenon;
b) The indicators of air pressure, oil level, oil flow and temperature are normal;
c) No obstacles or attachments that affect the safe operation of the equipment;
d) The cooler fan and oil pump are operating normally, and the heat sink has no serious contamination or foreign matter adhesion;
e) The casing oil level (air pressure) is normal, and there is no damage, cracks, serious contamination, and no discharge traces on the outside of the casing;
f) The moisture absorber is intact, the adsorbent is dry, and the oil seal oil level is normal;
g) There is no looseness or broken strands in the lead connection, moderate slack, and no signs of overheating and discoloration of the busbar;
h) Porcelain pillar insulation pillars are not inclined, and the rigid tube bus bar is straight and not bent, and is well fixed;
i) The dry-type smoothing reactor has no abnormal noise, no cracks on the surface, no creepage traces, no coating shedding, no heat and discoloration.
b) The contents of the monthly check include.
a) Perform infrared temperature measurement to check whether there is overheating phenomenon and overheating trend changes;
b) The control box, the secondary terminal box, and the mechanism box are tightly closed, well sealed, the heater and the temperature controller are operating normally, the power supply and the secondary small switch
The location is correct, the instructions are normal, the interior is clean, dry, and free of rust or damage;
c) The operating handle and valve position are normal;
d) The pressure release device, safety air passage and explosion-proof membrane are intact;
e) The tap position of the on-load tap changer is correct, and the online oil filter device works normally;
f) The fire fighting system and facilities are in good condition.
c) The contents of the annual inspection include.
a) There is no corrosion on the surface of the equipment grounding wire and grounding bolt, the crimping is firm, and the foundation has no settlement;
b) The number identification is complete and clear.
5.2 Inverter valve
a) Daily inspection content includes.
a) The temperature, humidity and ventilation in the valve hall are normal, there is no abnormal sound and vibration, no smoke and burnt smell, no abnormal discharge phenomenon;
b) There are no traces of water and debris on the floor of the valve hall;
c) The valve tower and arrester are suspended normally without obvious skew or deformation.
b) The contents of the monthly check include.
a) Carry out infrared temperature measurement, check equipment temperature and change trend;
b) The status indicators of the valve control equipment indicate normal.
c) The contents of the annual inspection include.
a) Check that the valve hall door and emergency door are in good condition, the door is well locked, and the wall casing entry hole is well sealed;
b) The serial number is complete and clear;
c) The roof and walls of the valve hall are firm, the pressure plate is well fixed, there is no abnormal noise, no obvious loosening and warping;
d) The drainage facilities of the valve hall are normal, the gutter is free of debris, and the downpipe is well fixed;
e) The floor of the valve hall is flat and clean without settlement;
f) The cable trench is well sealed.
5.3 DC field power distribution device
a) Daily inspection content includes.
a) The primary equipment has no deformation, corrosion, or oil leakage. There is no looseness or broken strands in the lead connection, and the slack is moderate. Porcelain pillar insulation pillar without tilt
Oblique, hard tube busbar is straight and not bent, and is well fixed. The shafts and pins of the transmission element are complete without falling off. The door is closed tightly;
b) No abnormal sound, vibration and smell, no obvious shaking, no abnormal discharge phenomenon;
c) There are no obstacles and attachments that affect the safe operation of the equipment;
d) The disconnecting switch has no connecting rod, deformed or out-of-position phenomenon of the knife arm.
b) Weekly inspections include.
a) The contact of the isolating switch is in good contact, and there is no abnormal phenomenon such as overheating, discoloration and displacement; the circuit breaker pressure and energy storage are within the normal range;
The pressure of the DC wall bushing and DC divider is within the normal range; there is no obvious discharge trace on the surface of the reactor body;
b) There are no breaks, cracks, damages and obvious flashover marks on the casing and porcelain bottle.
c) The contents of the monthly check include.
a) The position indication of the DC circuit breaker and isolating switch is normal, and the opening and closing positions of the auxiliary fracture of the DC circuit breaker are correct.
Match
b) Perform infrared temperature measurement to check whether there is no overheating phenomenon and overheating trend changes;
c) The sealing of the outdoor control box and terminal box, the heater and the temperature controller are operating normally, the power supply and the secondary small switch position are correct, and the internal cleaning
Clean and dry, no rust or damage to the equipment in the box;
d) The capacitor of the oscillating zero-crossing device of the DC circuit breaker has no bulging or oil leakage; the reactor has no peculiar smell or cracks; the surge arrester is clean and has no
Phenomena such as cracks, breakages, discharge and flash burn marks;
e) The position of the circuit breaker and isolating switch handle in the control cabinet is correct; the control and power switch positions are normal; the interlock position indication is normal;
The internal operating equipment is normal; the sealing is tight and good, and the heater and thermostat are operating normally.
d) The contents of the annual inspection include.
a) There is no corrosion on the surface of the equipment grounding wire and grounding bolt, the crimping is firm, and the foundation has no settlement;
b) The number identification is complete and clear;
c) The facilities such as fire blocking and anti-mislocking are intact;
d) The rain cover of the secondary junction box is intact and does not fall off.
5.4 AC and DC filter
a) Daily inspection content includes.
a) No abnormal sound, vibration, no abnormal smell;
b) The capacitor has no bulging and oil leakage;
c) No obstacles or attachments that affect the safe operation of the equipment;
d) The connecting wire is not loose, and the joint has no signs of overheating and discoloration;
e) The visible parts of the current transformer, resistance and reactor coil have no cracking, carbonization, arc traces or color changes, and the porcelain sleeve has no contamination
Like, no cracks.
b) The contents of the monthly check include.
a) Carry out infrared temperature measurement, check equipment temperature and change trend;
b) The AC and DC filter fences are intact, without corrosion, and the door locks are good.
c) The contents of the annual inspection include.
a) Check that the grounding wires and grounding bolts of the AC and DC filter equipment are free from corrosion, crimping is firm, and the foundation is free of subsidence;
b) The number identification is complete and clear;
5.5 Control and protection equipment
a) The weekly check includes.
a) The display of the screen cabinet panel is normal, the signal light is normal, and there is no alarm signal;
b) The screen cabinet has no burnt smell, abnormal sound and vibration;
c) The indoor air conditioner is operating normally, and the indoor environment temperature and humidity are normal.
b) The contents of the monthly check include.
a) The position of the power switch, secondary small switch, switch handle and pressure plate of the screen cabinet is correct;
b) The screen cabinet is well sealed, and the inside is clean and dry;
c) The lighting and printer in the screen cabinet are intact, and the host fan is operating normally;
d) Perform infrared temperature measurement to check whether there is overheating phenomenon and overheating trend changes;
e) There is no abnormal phenomenon such as loosening and disconnection of terminals in the panel cabinet.
c) The contents of the annual inspection include.
a) The ground connection of the screen cabinet is intact and free of corrosion;
b) The number identification is complete and clear;
c) The fireproof sealing of the screen cabinet is intact.
5.6 Valve cooling system
a) Daily inspection content includes.
a) The signal and indication of the water cooling system are normal, and the internal cooling water inlet and outlet temperature, flow, conductivity, water level, pressure and other values are in the normal range
Inside
b) There is no leakage of water pumps, pipes and valves;
c) The motor and pipeline have no abnormal sound, vibration, and burnt smell;
d) Check the water level of the make-up tank, and the make-up system is operating normally;
e) Check that the cooling tower is operating normally;
f) Check that the drainage system is operating normally and there is no serious water accumulation in the pump pit;
g) Check that the fan of the external air cooling system is operating normally.
b) The contents of the monthly check include.
Perform infrared temperature measurement of valve cooling system panels, cables, load switches and motors to check for overheating phenomena and changes in overheating trends.
c) The contents of the annual inspection include.
a) The equipment is well grounded, the grounding wire and grounding bolts are free of corrosion, and the crimping is firm;
b) The serial number is complete and clear.
5.7 Valve Hall Air Conditioning System
a) Daily inspection content includes.
a) No abnormal sound, vibration, burnt smell;
b) There is no leakage from the compressor, water pump, pipeline and valve.
b) The contents of the monthly check include.
a) The position of the windshield is normal, the valve position of each circuit is normal, and the valve limit device does not fall off;
b) The indicators on the control panel are normal, the water temperature, water pressure, and flow rate are normal, and the water level of the make-up tank is normal;
c) There is no serious damage to the pipe insulation.
c) The contents of the annual inspection include.
a) The equipment is well grounded, the grounding wire and grounding bolts are free of corrosion, and the crimping is firm;
b) The serial number is complete and clear.
6 Special inspection items and requirements
6.1 Inspection items for severe weather such as heavy rain, strong wind (sand), hail, dense fog and geological disasters such as earthquake
a) Before heavy rain, check that the outdoor terminal box and mechanism box are closed well, and the doors and windows of the equipment room are closed well;
The industrial video system checks whether there is rainwater backflow, whether the forced drainage facilities are operating normally, and there is no serious water accumulation or waterlogging in the station; rainstorm days
After air, check the outdoor terminal box and mechanism box for water. There is no leakage or accumulation of water in the room. The water level in the sump is normal. Rainwater pumping
The line is normal and the rainwater level is normal.
b) Before the windy (sand) weather, check and clean up floating objects on site, check the fixation of temporary supports, and remove them if necessary. Check equipment
The doors and windows are closed well, and the outdoor terminal box and mechanism box are closed well; in strong wind (sand), use the industrial video system to check
The swaying situation of the drainage line and bus bar, the swaying situation of the vertically installed mother pipe, arrester, and casing; check after strong wind (sand) weather
Whether the roof is loose, whether the profiled steel plate is blown away by the wind. Check the primary equipment for hanging foreign objects, and whether the equipment body is tilted when installed vertically
Oblique deformation, check whether the rain cover is off or loose, and whether the outdoor cable trough box is off or loose. Check that there is no serious sand accumulation in the building,
There is no sand accumulation in the outdoor terminal box and mechanism box, and the air conditioning filter of the valve hall is not seriously blocked.
c) After the hail weather, check the entire station equipment, especially the vulnerable equipment such as insulators, for abnormal appearance, check the cooling tower (cooler) wind
There is no abnormal vibration and sound when the blades rotate, no abnormal vibration of the belt, and whether the tube bundle fins fall down.
d) In dense fog, check for flashover and discharge along the surface of the insulator.
e) After the earthquake, check that the equipment leads, pipe sockets, etc. are firmly connected, and the casing, insulation pillars and structures are not tilted, and the equipment foundation
No settlement; whether the equipment sound is abnormal; whether the oil-filled equipment has oil leakage; whether the valve cooling equipment has water leakage.
f) When the temperature changes suddenly, check whether the oil level of the oil-filled equipment changes significantly, and whether the AC and DC filter capacitors have oil leakage or bulging.
6.2 Inspection items during trial operation of new equipment
During the trial operation of the new equipment, the inspection of equipment discharge sound, vibration and infrared temperature measurement should be strengthened. Strengthen the monitoring of the temperature of oil-filled equipment.
The valve cooling system strengthens the inspection of motors, pipe joints and valves.
6.3 Equipment maintenance, transformation, or long-term outage and commissioning inspection projects
a) A comprehensive inspection of the equipment, converter transformers and oil-immersed smoothing reactors should be carried out before the equipment is put into operation after maintenance, transformation or long-term shutdown
Before putting into operation, a functional inspection of cooler operation and on-load tap adjustment should also be carried out. Before the valve cooling system is put into operation, 72
Hours of trial operation.
b) After the equipment is put into operation, an inspection should be carried out in accordance with the routine inspection of all items, focusing on strengthening the equipment discharge sound, vibration and red
The inspection of external temperature measurement strengthens the monitoring of the temperature of oil-filled equipment. The valve cooling system strengthens the inspection of motors, pipe joints and valves.
6.4 Inspection items for high temperature, extreme load, equipment overheating or over temperature
a) In hot weather, check the oil temperature, oil level, and cooler operating normally, and there is no oil leakage at each seal. AC and DC filter
The container has no bulging or oil leakage, and the joint has no signs of overheating and discoloration. The valve cooling system is operating normally and the cooling tower is operating normally.
b) In case of heavy load, overheating or over-temperature of the equipment, the infrared temperature monitoring of the equipment should be strengthened.
c) When the DC power is in low-load operation, the inspection of smoothing reactor and DC filter should be strengthened.
6.5 Inspections when suspicious phenomena are found during equipment operation and equipment defects have devel...
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