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Summary of Supervision Work of Electrical Specialty 1 Based on the principles of law-abiding, fairness, science and honesty, the construction unit is given the policy of "three controls, two controls and one coordination" in supervision work. Strengthen the supervision of construction units and do a good job in dynamic control. The supervision building area of xx is about xx million square meters. In the work, adhere to the guiding ideology of quality first, prevention first, process control and terminal control, abide by professional ethics, maintain the image of the supervision company, strictly supervise the construction unit, combine supervision with help, and serve the construction unit enthusiastically. The following points are put forward in quality control.
First, quality control. Setting of quality control points in construction.
(1) For key parts or weak links, it is generally necessary to analyze the reasons that may cause quality problems in advance, and then formulate pre-control countermeasures according to the reasons.
(2) Key working procedures or links in construction, concealed works, parts or links with changes and new materials, difficult working procedures or links in construction, construction conditions or technical difficulties.
(3) the control of construction personnel. In supervision, we should focus on controlling and supervising unqualified, undocumented, low-level and unresponsive construction workers; The quality of building materials, because it directly affects the quality and safety of the project, should focus on its quality and performance control. (For example, when the temperature is low in winter, pvc pipes are easy to break, and so on. When casting the board surface, electricians are strongly required to stand by and supervise. )
2. Control the technical bottom of the contracting construction unit. This is one of the conditions to ensure the construction quality, therefore, disclosure should be made before each subdivisional work starts.
(1) Strictly control the inspection of materials, finished products, semi-finished products and components to prevent unqualified products from being used in engineering.
(2) Review the technical disclosure information of the construction unit, understand the on-site disclosure situation, avoid disconnection, and master the dynamics of the construction unit. Xx urban and rural project department xx building is divided into x team. In the process of construction, I noticed the differences in personnel quality, construction methods and construction quality of each team, and took targeted measures to improve the construction quality.
(3) Construction between examples: In order to reduce large-scale mistakes and rework, construction between examples plays an important role in regulating the behavior of construction units and construction quality. In the process of construction, each team adopts the method of starting between examples, and the control effect is good. All construction units and teams are required to make a set of model rooms on each building, and the installation work can only be fully carried out after the acceptance.
(4) In the construction, the method of combining on-site supervision, patrol and parallel inspection shall be adopted to strengthen the quality control of concealed works, important parts, key links and weak links to ensure foolproof. For the abnormal situation, carefully analyze, distinguish responsibilities, deal with it seriously, and communicate with the electrical supervision engineer xx in time for major problems.
3. Control of materials and components. All raw materials transported to the construction site shall be handed over to the supervisor before entering the site. The peers shall attach the factory certificate and technical specifications of the products, and the inspection report shall be inspected by the contractor according to the specified requirements. Only after being checked and confirmed by our supervision engineer can they enter the site.
4, schedule control
Compared with xx Project Department, the construction progress of Anda No.1 Project Department is slow and the construction quality is poor. In this case, through the analysis of personnel, machinery and engineering quantity, the construction unit of Anda is reminded not to change people many times and increase advanced machinery (such as pipe bender, etc.). ), learn the advanced experience of electrical installation of Anda II Project Department, and urge the construction unit to adjust personnel and machinery, which laid the foundation for ensuring the total construction period.
5. Acceptance of engineering construction quality. Acceptance of engineering construction quality is an important link in engineering construction quality control. Xx "Unified Standard for Acceptance of Construction Quality of Building Engineering" must be implemented, which is the general criterion for acceptance specifications of various disciplines of building engineering (X) laying of conduit:
(1), dark with threading steel pipe, interface without butt welding phenomenon. This problem is often encountered in the inspection process. Butt welding of thick-walled steel pipes (wall thickness greater than xmm) will cause internal nodules and damage the insulation layer when passing through cables. The fusion welding connection of thin-walled steel pipe (wall thickness less than or equal to xxmm) will burn through, and when it is buried in concrete, it will seep into the slurry, which will lead to the blockage of the conduit. These phenomena are not allowed to happen. Therefore, the mandatory provisions of xx in xx require that butt welding of metal conduits is strictly prohibited, and casing welding of galvanized and steel conduits with wall thickness less than or equal to xmm is not allowed. Thick-walled steel pipe should be welded with casing, and the weld should be full and dense. Galvanized steel pipe requires threaded connection, and both ends of the joint are fixed with special grounding cards, which cross the grounding wire. Thin-walled steel pipes have threaded connections and tight connections. However, it is required to plug the interface to prevent moisture from infiltrating into the pipe and aging the insulation layer of the wire, and to increase the conductivity of the connection.
(2) The laying depth of steel distribution pipe does not meet the specification requirements. Too deep buried pipes are not conducive to the connection with boxes and boxes, and sometimes too deep slotting will affect the quality of buildings such as walls; Too shallow is not conducive to the connection with boxes and boxes, and it will also cause cracks on the surface of buildings. In some damp places (such as the basement, etc.). ), the corrosion of steel conduit will appear on the wall, so the buried depth is appropriate, which not only protects the conduit but also does not affect the building quality. Therefore, xx requires that the protective layer thickness of concealed conduit should be greater than xmm, and the box should be plastered with cement mortar with strength grade not lower than mx. Slotting requires mechanical slotting, and manual slotting is prohibited. Also, the inside and outside of the steel pipe are not coated with antirust protective paint. In view of these problems, urge the construction party to rectify immediately when inspecting the site.
(3) pvc20 works the most, the distance is not allowed when laying, the corner is too small, the butt joint is not sticky, the groove width is not enough, and the groove is bulging and horizontal. These problems are constrained in on-site inspection almost every day.
(2) Distribution box installation:
A, the reserved hole of the distribution box. Because the drawings give the electrical installers a coordinated way: "Electricians should cooperate closely in electrical construction and prepare reserved holes and embedded parts", and the specific size of reserved holes is not specified in the drawings, there is no unified and standardized reserved hole in most building user metering boxes. After careful statistics, X units in Building X have only X floors. Of the reserved holes of X metering boxes, only X holes are still qualified, and the rest are left without holes. X reserved hole is not a lintel, xx "Code for Acceptance of Masonry Engineering Construction Quality" Article X, when the number of holes left in masonry wall exceeds X, a lintel should be set; The X hole is extremely bad (there are photos of the X hole), and examples like this are more prominent on the X building. Other buildings abound.
B, box quality problems are manifested in the following aspects:
(1) is not sized according to the drawing requirements.
(2) The dimensions of the products delivered to the construction site are inconsistent with the drawings. In view of the above problems: ① It is required to order in strict accordance with the design drawings and relevant specifications. Upon arrival, visual inspection shall be carried out to check whether there is a factory certificate, whether the nameplate is correct, whether the accessories are complete, whether the insulation part is defective or cracked, and whether the coating is complete. (2) The iron box of the distribution box should be consistent with the drawing size. If there is any discrepancy, it is necessary to find out whether the manufacturer produces according to the data requirements. Then find out the disclosure notice.
(3) Various coincidental installations:
(1) The height of the socket cassette to the ground is not X-ray loaded or X-cm loaded X-ray is misplaced, which makes the height of the loaded cassette inaccurate; The installation of several cassettes on the wall is not on the same plane.
(2), air conditioning, water heater tank height is not allowed to be too high;
(3) The position of the switch cassette is chaotic. The new requirement is that it can be far away from the edge X when it meets the concrete column. Therefore, after painting is completed, when the column is not visible, the switch distance from the edge is regarded as different. Such problems are corrected one by one in the inspection.
(4) Installation of lightning protection and grounding system
Part of the lightning protection zone and grounding device have insufficient lap length and are welded unilaterally. Installation requirements of lightning protection belt and grounding device: ① The lap length of flat steel shall not be less than twice its width, and it shall be welded on three sides. When the width of flat steel is different, the lap length should be wider; (2) The lap length of round steel shall not be less than 6 times of its diameter, and it shall be welded on both sides. When the diameters are different, the lap length with larger diameter shall prevail; (3) When the round steel is connected with the flat steel, its lap length should not be less than 6 times the diameter of the round steel, and it should be welded on both sides; (4) When welding flat steel and steel pipe, flat steel and angle steel, it should be close to the 3/4 surface of steel pipe or the outer two sides of angle steel, and the upper and lower sides should be welded; ⑤ In addition to the welded joints buried in concrete, other measures should be taken to prevent corrosion. Do not meet the above specifications, will not be accepted.
(5) Equipotential bonding
(1) Main equipotential bonding (meb) The Code for Design of Low-voltage Distribution requires that the following conductors should be used for the main equipotential bonding in the building when the ground fault protection is adopted: Grounding trunk line of grounding electrode of electrical device; Metal pipes such as water pipes, gas pipes, heating pipes and air conditioning pipes in buildings; When conditions permit, electrical conductors such as metal components of buildings. The above conductors shall be connected with the general equipotential bonding terminal when entering the building, and the joints of metal pipes in equipotential bonding shall be reliably connected and conducted. In equipotential construction, xmm×xmm galvanized flat steel is generally connected to the conductor from meb copper connecting bus. Generally, galvanized flat steel or copper strip with a size of not less than xmm×xmm shall be used for the connection hoop of various metal pipes.
(2) Equipotential bonding in the bathroom. Article X, paragraph 6, requires that toilets with bathing equipment should be equipotentially connected. The construction method required in Area C is to use xmm xmm flat steel to make xcm to the ground for one week, and then make X XMM XMM screws that need to be grounded as grounding bodies. It mainly controls the connection with its outlet.
(4) When welding flat steel and steel pipe, flat steel and angle steel, it should be close to the 3/4 surface of steel pipe or the outer two sides of angle steel, and the upper and lower sides should be welded;
⑤ In addition to the welded joints buried in concrete, other measures should be taken to prevent corrosion. Do not meet the above specifications, will not be accepted.
Third, deal with engineering quality problems in time.
For construction without drawing, construction without license, subcontracting for many times, hooking, inadequate construction management, unqualified raw materials, oversized bad grooves and drilling holes, unqualified reserved holes, weakened load-bearing sections, etc., the supervision shall stop the construction in time after discovering it. If you seriously or don't listen to the supervisor's verbal stop, the supervisor can issue a notice of temporary suspension. For the small quality problems in engineering construction, solve them in time during the inspection of the construction site and the acceptance of partial projects. For engineering quality defects that can be generally reworked or repaired, the contractor shall be instructed to write a quality problem report first, explain the situation and put forward treatment opinions. After verification and research by the supervision engineer, the treatment scheme shall be determined with the consent of the construction unit when necessary, and then the contractor shall reply to it for treatment, and then it shall be re-accepted.
Fourth, the collection and arrangement of data.
Relevant information shall be collected in time during construction, so as to be complete and synchronized with the project, and meet the requirements of binding and filing upon completion.
Summary of Supervision Work of Electrical Specialty 2 # 1 The overhaul of generator set lasted for 55 days from April 25th, 20xx to June 28th, 2008/KLOC-0. The overhaul period is short, the task is heavy, and there are many problems found and handled during the overhaul. Under the guidance of the principle of safety first and compulsory maintenance of overhaul equipment, all electrical maintenance personnel have exerted their wisdom and mastered flexible working methods under many objective conditions and achieved gratifying results in practice. Through the joint efforts of all electrical professionals, all the standard items and non-standard items listed in today's maintenance plan have been completed, without any omission, and have passed the inspection.
Electrical maintenance specialty
First, the planned overhaul standard project
1, 48 generators and excitation systems, of which 48 were actually started and completed, and passed the step-by-step acceptance procedure;
2. 65,438+06 main transformers, of which 65,438+06 were actually started and completed, and passed the step-by-step acceptance procedure.
3. There are 18 items of high-voltage auxiliary transformers and high-voltage desulfurization transformers, and they have actually started and completed 18 items, and have passed the step-by-step acceptance procedures.
4.#6 10 turnout interval is 13, the actual construction is completed, and it has passed the step-by-step acceptance procedure.
Item 19 of primary equipment for 5.6KV power transformation and distribution has actually started 19, and has passed the step-by-step acceptance procedure.
6, 6kv motor, inverter and its cable, 6kv motor ***3 1 overhaul, actually started to complete 3 1, trial operation passed the step-by-step acceptance procedure.
The actual construction of the 7.380v system was completed, and the step-by-step acceptance procedure was passed. DC system and UPS * * * items were actually started and completed, 9 items of desulfurization and ash removal passed the step-by-step acceptance procedure, 4 items were actually started and completed, and 5 items were actually started and completed after the step-by-step acceptance procedure.
II. Non-standard projects and technical transformation projects 10.
Three. Matters needing attention in supervision work
In the process of overhaul, the electrical professional supervision engineer works in accordance with the supervision rules and the principles of honesty, law-abiding, fairness and science: from beginning to end, the power plant # 1 mechanical and electrical professional equipment overhaul, the whole process of construction tracking and acceptance visa; On-site inspection and visa for the main equipment and important auxiliary equipment of the generator; To inform the supervisor of the incident, those who should come will come, and those who should witness will witness, without omission.
In May 1 1 day 1 # 1 generator rotor pumping process, the manufacturing supervisor found that most rotor slot wedges were damaged by foreign objects during operation, and then found that there were more than 800 damages to rotor slot wedges and more than 300 damages to stator core slot wedges. When cleaning the stator, I found an iron block the size of a broad bean and many aluminum alloy fragments in the rotor slot wedge, huh?
Handling situation
Stator: stator slot wedge 1-5 All slot wedges in the wind area should be re-toothed, and gaskets, slot wedges, partition plates in the wind area, rubber and copper screws should be replaced, and the stator core loss test should be carried out. According to the hot spot of iron loss, the iron core silicon steel sheet is filled with mica sheet, coated with insulating paint, and the defects are eliminated by repeated tests until it is qualified. Stator surface potential test, the abnormal surface potential was tightened and passed the step-by-step acceptance procedure.
Rotor: the rotor pulls out the large retaining rings at both ends of steam excitation, and conducts 16 coils at two poles. Each group of coils is put back into the tank after withstand voltage of the tank, coil inspection, interlayer insulation treatment and shaping. Among them, No.25 trough box was damaged, and a pair of trough boxes were replaced. According to the damage degree, the damaged slot wedge shall be lightly ground and colored for flaw detection, and the damaged slot wedge shall be replaced. The retaining ring and fan ring were inspected by flaw detection. Weigh the slot wedge, dry and clean the slip ring lead. DC resistance, withstand voltage test, rotor air tightness test and rotor air bucket ventilation test all passed, the theoretical counterweight was balanced, the suit met the requirements, and passed the step-by-step acceptance procedure.
2. During the overhaul of # 1 generator set, * * issued 223 quality acceptance certificates of Grade II equipment, 86 Grade III acceptance certificates, 45 concealed works visas and 105 special acceptance visas. # 1A slurry circulating pump and # 1C electric feed pump returned to the factory for maintenance.
The neutral point of the generator was replaced by 3G 124TV three-phase. The original model was JDZX8—20V, and the current model is jdzx4-20. The copper tube of the hydrogen cooler at the excitation end of the generator leaks, so replace the spare parts of the same model. #4 belt motor coupler is damaged when pulling out. Replace spare parts of the same model. A 1 The leakage test of the coal mill failed to pass the replacement of the standby motor, and the fan bucket of the motor was reformed.
The front and rear bearings of 28 high-voltage motors were replaced with spare parts of the same model, and the bearing shells of 2 induced draft fans were replaced or recast.
Replacement of dynamic and static contacts of 220kV partial disconnector GW7-220 (W). #0 1 porcelain insulator of starting transformer is equipped with umbrella skirt and sprayed with silicone paint.
A, B, D powder discharging motors, 3 sets of primary motors of ash pump and 5 sets of high-voltage motors of B induced draft fan are missing a lot. Assemble the slot wedge and coat it with insulating paint.
3. Issue 3 supervision contact sheets and 5 evaluation sheets, review and propose to modify the work instructions, and draw one for each generator through the rotor. A water pressure test of generator stator cooling waterway, a test plan before and after generator overhaul, and a visa for rotor slot wedge loosening and rotor concealed engineering. Stop the illegal operation of the generator rotor 1 time, point out that the generator is not connected to the bus 1 time, point out that the scaffolding personnel at the 220kV booster station hold a 6m-long steel pipe 1 time, which violates the safety regulations 1 time, and point out that the equipment has unsafe factors for 4 times.
4. In the process of overhaul, the electrical professional supervision engineer shall carry out his work according to the supervision rules and the principles of honesty, law-abiding, justice and science: overhaul the electrical professional equipment of the power plant # 1 machine from beginning to end, and implement the whole process of construction tracking acceptance visa; On-site inspection and visa for the main equipment and important auxiliary equipment of the generator; To inform the supervisor of the incident, those who should come will come, and those who should witness will witness, without omission.
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