Factors Affecting Line Loss of 10KV Distribution Network

Line loss is the loss of electric energy in various links such as power grid transmission, transformation, and power distribution. It is an objective physical phenomenon in the process of power grid transmission and distribution. The causes of line loss mainly include resistance, magnetic field and management. Distribution network loss calculation is the basis of distribution network economic operation, reactive power optimization and power grid technical transformation. The theoretical line loss calculation is convenient for the operation management department to analyze, so as to take practical and feasible loss reduction measures to achieve the greatest economic benefits. So today we will take a look at the line loss and loss prevention measures of 10KV distribution network.

The power loss of the 10KV distribution network is mainly the loss of the high-voltage power grid, the low-voltage power grid and the household line, and can be divided into technical line loss and management line loss according to the nature. How to achieve the purpose of reducing the loss of the distribution network from these two aspects has always been one of the important distribution management issues studied by electric power experts and technicians.

1. Factors affecting technical line loss and management line loss

1.1 Influencing factors of technical line loss

The size of the technical line loss is related to the electrical equipment and the grid structure, which is mainly reflected in the following aspects:

1.1.1 Iron loss and copper loss of transformers, voltage regulators, transformers, reactors, arc suppression coils and other equipment.

1.1.2 The loss of distribution lines and household lines.

1.1.3 Dielectric loss and corona loss of cables, capacitors and insulators.

1.1.4 Leakage loss caused by poor insulation of live equipment.

1.1.5 Loss of DC charging devices in transformer and distribution stations, as well as control, protection, signal, ventilation and cooling equipment.

2. Influencing factors of line loss management

The management line loss is caused by the error of the measurement equipment and the inadequate management caused by the human error. At this stage, 10KV mainly reduces losses through the following links.

2.1 Measurement management link. The loss caused by the non-standard installation process of the metering device and the error caused by the accuracy of the metering device itself.

2.2 Marketing management link. Losses caused by errors in the process of meter reading and accounting, and errors caused by the inconsistency of meter reading and settlement time for electricity supply and sales.

2.3 Electricity management link. Power grid leakage and power customer theft cause power loss.

3. Line loss module

3.1 High-performance design concept with multiple technical advantages

3.2 A variety of communication methods greatly improve management efficiency

3.3 Various functions can be customized to meet the customized needs of users

3.4 Small size, easy to connect with various user equipment

3.5 unique shape design, easy to install

For the loss reduction measures adopted for the line loss of 10KV distribution network, the influencing factors of technical line loss and management line loss, technical auxiliary management can be adopted to improve the loss reduction ability. Technology is the foundation of loss reduction, and management is the key to loss reduction. The following mainly talks about the countermeasures of technical line loss.

4. Main countermeasures for technical line loss

4.1 Selection of measurement points. The power distribution metering point of the user should be selected as much as possible at the property right boundary point of both the power supply and the consumer, so as to facilitate management and reduce the calculation of line loss sharing. In addition, users with large peak-to-valley differences should also consider the accuracy of light-load metering.

4.2 Selection of measurement methods. Generally, it is advisable for low-voltage users to connect the electric energy meter to the circuit without a transformer, so as to reduce errors and avoid mistakes; whether high-voltage users measure at the high-voltage side or at the low-voltage side, it is mainly based on the distribution load rate or the transformation ratio of the current transformer. According to the configuration, when the primary and secondary currents of the current transformer meet the measurement requirements, it is advisable to measure at the high voltage side as much as possible.

4.3 Selection of metering devices. It is mainly the choice of transformer and the choice of ammeter. The selection of the voltage transformer is mainly to meet the requirements of the rated voltage; the selection of the current transformer should also select the appropriate transformation ratio according to the load current, so that the normal load range is 30%~100% of the rated current of the current transformer Within, the maximum shall not exceed 120% of the rated current, and the minimum shall not be less than 10% of the rated current. The selection of the electric energy meter is determined according to the actual load or the estimated load of the user. Generally, the change of the normal load is within the normal range of the error of the electric energy meter. If possible, the use of wide-load electric energy meters can be promoted.

4.4 Selection of the installation method of the metering device. It is mainly to use distributed and centralized installation of tables according to households. In order to facilitate management and prevent electricity theft, centralized meters should be installed in boxes as much as possible if possible. When installing meters by households, the principle of safety and convenience should be the main principle, and attention should be paid to preventing electricity theft.

4.5 Anti-failure measures for metering devices. The quality of the installation and maintenance of metering equipment should be ensured, and work mistakes and omissions should be avoided as far as possible. Especially when the three-phase electric energy meter is connected through the transformer, attention should be paid to the transformation ratio, polarity, and phase difference.

4.6 Regular inspection and patrol inspection of metering devices. Regular inspections of metering devices should be done in accordance with relevant regulations.

4.7 Planning and management methods of distribution network. In the overall planning of the distribution network, loss reduction and energy saving can be taken into consideration at the initial stage of distribution network planning, and the distribution of power points can be reasonably arranged. Because of the different layout of the power point, the power loss and voltage loss will be very different. The multi-point layout has a significant effect of reducing loss and energy saving, and can also effectively improve the voltage quality.

The power line loss module independently developed by Four-Faith Smart Power can facilitate and calculate the loss of power lines. The distribution line loss acquisition module (hereinafter referred to as the acquisition module) is a 10KV distribution high-voltage system based on voltage/current sensors and electromagnetic transformers. The metering device provides solutions for the needs of high-voltage electric energy metering and real-time monitoring at equipment nodes such as 10KV distribution lines, branch points, pole switches, and ring network cabinets. An important part of the management system.