Power supply capacity
1. Main indicators:
High-voltage distribution network indicators: grid capacity ratio (macro), line heavy load, light load ratio, main transformer heavy load, light load ratio (micro), substation N-1 pass rate
Medium voltage distribution network indicators: line heavy load, light load ratio, distribution variable heavy load, light load ratio, distribution transformer comprehensive load rate, line average load rate, average distribution capacity, line average installation capacity, 10kV Feed line interval utilization.
2, the main performance:
The regional load ratio is low or high, and there are also the phenomenon of heavy load and redundancy coexisting in 110kV and 35kV substations.
Heavy-duty lines and heavy-duty distribution of 10kV lines cause difficulty in load transfer during maintenance or failure, and there are potential safety hazards. The per capita distribution capacity of rural households is low, and the return of migrant workers in some areas to the Chinese New Year leads to serious problems of heavy overload during the Spring Festival.
The 10kV interval utilization rate is high, and the substation load rate is low. There are even 10kV interval resources, and some substations cannot be out.
3, the main measures:
The problem of low load-to-load ratio will be gradually solved by adding substation sites and rationally optimizing the power supply range of the substation.
Substation heavy-duty and redundant coexistence problems will be solved by optimizing the substation power supply range; the substation redundancy problem will be gradually solved with the increase of regional load or load redistribution.
Through the addition of new distribution points and transformation and capacity expansion, the problem of load transfer and the low capacity of households in rural areas are solved.
Renovation of the 110kV substation will increase the screen position, and the construction of the opening and closing station will be part of the smaller capacity of the cabinet and the double-cable cable will be connected to the station to open and close the centralized load.
Power grid structure
1. Main indicators:
High-voltage distribution network indicators: single-line single-variable ratio, main transformer line N-1 pass rate
Medium voltage distribution network indicators: contact rate, inter-station contact rate, line N-1 pass rate, power supply radius, average segment number of 10kV lines
2, the main performance:
High-voltage distribution network: single-radiation structure and single-line single-variation ratio are high, which can not meet N-1 requirements, low power supply reliability, and weak load transfer capability. In some remote areas, the 35kV grid has a long power supply distance and multiple-stage serial supply. It does not meet the requirements of the line N-1 configuration. When one line fails, the other line cannot be transferred, resulting in power failure at the end of multiple substations. And load transfer capacity is limited.
Medium voltage distribution network: the power supply range overlaps and the power supply problem is outstanding; the power grid structure is not clear, the single radiation line accounts for a large proportion; the contact point setting is unreasonable, there are more invalid contacts; the transfer capacity is not strong; the number of segments is less, The power supply flexibility is poor, and the power outage has a large range. In some areas, the power supply radius of the 10kV line exceeds the requirements of the guidelines, and some also have bypass power supply, and the user's voltage quality is poor.
3. Main measures
Through the new substation layout, optimize the 110kV, 35kV network structure, and gradually improve the construction of the radiation-to-chain, single-ring to double-ring power grid structure.
, The new contact line engineering through new 10kV substation a new line and the existing line contact, re-optimize substation supply area, remove the invalid contact, the target network overhead wiring by multi-segmented appropriate liaison, cable network connection target by a single ring (Double-ring network) straighten out and strengthen the medium-voltage grid, gradually meet N-1, improve the capacity of medium-voltage line transfer, and improve the support capacity of the distribution network to the upper-level power grid.
Electrical Equipment
1, the main indicators:
More than 20 years of equipment ratio, high loss ratio, cable ratio, medium and low voltage line insulation rate
2, the main performance:
Some of the equipment is old, the health is poor, the operation and maintenance are difficult, and the power supply reliability is low.
The 10kV distribution network overhead line (bare wire) is not strong enough to withstand natural disasters.
Most of the equipment in the unmodified Taiwan area is of poor quality, and there is a high-loss distribution transformer that does not meet the requirements for economic operation of the distribution network .
Rural low-voltage lines also have bare wires, and there are a lot of safety hazards.
3. Main measures:
In combination with the actual operation of the equipment, the old equipment will be gradually solved by means of modification and replacement. According to safe operation and municipal needs, the insulation rate and cable rate are gradually improved. For the existing Taichung area, the low-voltage station area will be sorted and rectified by the natural village as a unit, and the line with long load and large line will be cut, and the high-loss and unreformed area will be cleaned by village, and the comprehensive line loss will be reduced year by year.
Distribution automation
1. Main indicators:
Distribution automation coverage, distribution automation effective coverage
2, the main performance:
The lack of distribution automation construction is in line with the distribution network planning, and a large number of existing lines, switches, and communication networks need to be reconstructed.
3, the main measures:
At the substation outlet circuit breaker, the equipment is modified according to the requirements of the distribution automation design guidelines at key nodes such as ring network cabinets, switch stations, and contact points. Replace equipment that cannot be equipped with FTU, PT, communication device or modification mechanism.
The analysis of the status quo of the distribution network can refer to the above aspects and indicators for analysis, and also consider the problems will also affect each other. The problems found in this way are particularly direct and require a comprehensive solution.
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