Lugao Power Co.,Ltd

What is the Power Transformer?

A power transformer utilizes the principle of electromagnetic induction to convert alternating current (AC) of one voltage level into AC of another voltage level at the same frequency, thereby serving to transmit electrical energy. It reduces high voltage electricity to a lower voltage level suitable for use by user equipment, or elevates low voltage electricity to high voltage for transmission, thereby achieving the effect of electrical energy exchange.

Main Types of Power Transformer

Power transformers are classified into oil immersed transformers and dry type transformers based on their cooling methods.

Oil immersed transformers use transformer oil for insulation and heat dissipation. Common cooling methods include natural cooling (ONAN), forced air cooling (ONAF), forced oil circulation air cooling (OFAF), and forced oil circulation water cooling (OFWF).

Dry type transformers use air or solid insulating materials such as epoxy resin for cooling. Common cooling methods include natural air cooling (AN) and forced air cooling (AF).

By phase number, transformers are classified into single phase transformers and three phase transformers.

Benefits of Power Transformer

1.Achieve efficient power transmission

Whether it is stepping up or stepping down, Power Transformer is a key device to ensure efficient transmission of electric energy. When the high voltage of the power plant is transmitted over long distances through high-voltage transmission lines, Power Transformer can effectively reduce power loss. When distributing electricity to daily life, Power Transformer reduces high voltage electricity to low voltage electricity suitable for daily life equipment.

2.Improve economic efficiency

When conducting power transmission operations, it can effectively reduce power loss and significantly save electrical energy. Stable voltage can ensure that the production line does not stop. It can also reduce the cost of laying cables in terms of power grid investment.

3.Guarding the safety of the power grid

Voltage fluctuations may cause short circuits, leading to potential fire hazards and damage to electrical appliances. The electrical isolation of the Power Transformer can prevent the transmission of faults such as lightning strikes and short circuits, reducing the risk of accidents and providing a stable voltage for the operation of electrical appliances.

4.Low carbon and environmental protection

With the advancement of technology, the design of Power Transformers has been continuously innovated. The carbon emissions of primary energy efficient transformers are significantly lower than those of traditional designs. The use of the main transformer has replaced the scattered small-capacity transformers, and at the same time, it has saved space.

What is the Box Type Transformer Substation?

Lugao Power Co.,Ltd is a company specializing in R&D, Production and sales of high voltage transmission and distribution equipment. The key focus in the design of a Box Type Transformer Substation is high prefabrication, enabling rapid deployment upon installation, hence it is also referred to as a pre-assembled substation. It integrates high voltage switchgear, transformers, and low voltage distribution equipment into a single enclosed box, with each module assembled independently. The components inside the box can be customized according to the specific conditions of the usage area. For example, in outdoor industrial zones, oil immersed transformers with single source power supply can be selected, while in commercial areas, dry type transformers with dual source power supply can be chosen.

Main Types of Box Type Transformer Substation

Box-Type Transformer Substation can primarily be categorized into European-style substations and American-style substations.

European-style substations employ a modular assembly design, with high voltage, low voltage modules, and transformers operating independently. High voltage modules can be equipped with independent high voltage switchgear. Space must be reserved for transformer cooling. Low-voltage modules can utilize GCK or GGD type low voltage switchgear, offering greater expansion capacity than American-style substations and can also be equipped with microcomputer protection functionality. During operation, the front door of the high-voltage room can be opened, and regular maintenance only requires opening the front door of each independent room.

American style substations adopt a highly integrated design language, resulting in a compact overall structure. This enables American style substations to be quickly relocated, offering strong spatial adaptability and convenient maintenance. Their high voltage system is integrated with the transformer, without an independent operating area. Under conditions requiring temporary power supply, American style substations can address urgent needs effectively.

Benefits of Box Type Transformer Substation

1. High installation efficiency

Highly prefabricated by the manufacturer, it can be quickly put into use at the site. Wiring and related facilities are easy to operate, allowing installation personnel to get started easily.

2. High space utilization

The Box Type Transformer Substation has a compact structure and occupies a much smaller area than traditional substations. This reduces installation costs and allows for easy placement using a crane.

3. Safe and Stable

The enclosure is made from materials with ultra high protection ratings, enabling it to withstand a wide range of environmental conditions. The busbar system features insulation design and additional protective devices, eliminating the risk of electric shock from accidental operation. The enclosure can be equipped with cooling and dehumidification equipment, enhancing operational stability.

4. Low Carbon and Environmentally Friendly

The box type substation offers simple and flexible configuration options, with manufacturing technology continuously improving. Its operational carbon emissions and energy consumption are significantly lower than those of conventional transformers.

What is Switchgear?

Switchgear primarily serves a control and protection function in power systems. It controls circuit connection and disconnection by opening and closing circuit breakers and starting and stopping equipment, and switches power paths through bus tie switches to distribute electrical energy. In the event of a short circuit, it can quickly cut off the fault current and provide overload fault protection. There are many types of switchgear, and the internal components that can be selected also vary, so it is necessary to adapt to local conditions.

Main Types of Switchgear

Low-voltage switchgear

The GCS type withdrawable switchgear is a low-voltage complete distribution device used for distribution, motor centralized control, and reactive power compensation in power supply systems with a three-phase AC frequency of 50 (60) Hz, a rated operating voltage of 400 V or 600 V, and a rated current of 5000 A or below.

The GCK type withdrawable switchgear is designed for distribution and motor centralized control in power supply systems with three-phase four-wire or five-wire AC systems, voltages of 380V or 660V, a frequency of 50Hz, and a rated current of 5000A or below.

The GGD type AC low-voltage distribution cabinet is designed for power conversion, distribution, and control of power, lighting, and distribution equipment.

MNS-type withdrawable switchgear is used for the control of power generation, transmission, distribution, and power consumption equipment, and for reactive power compensation of the main busbar through capacitor compensation cabinets.

High-voltage switchgear

KYN28A-24-type armored withdrawable AC metal-enclosed switchgear is used for receiving and distributing electrical energy, as well as controlling and protecting circuits.

KYN61-40.5 type armored withdrawable AC metal-enclosed switchgear is primarily used in substations and power plant distribution rooms for receiving and distributing electrical energy.

XGN type box-type fixed metal-enclosed switchgear is suitable for three-phase AC single busbar, double busbar, and single busbar with bypass systems, serving to receive and distribute electrical energy.

Ring Main Unit

The SRM-12 type fully sealed, fully insulated, gas-filled ring main unit is a high-tech product independently developed by LUGAO, available in two categories: fixed-type unit combinations and expandable-type units, to meet the needs of various substations for compact switchgear.

The XGN15-12 type SF6 unit-type AC metal-enclosed ring main switchgear is used for receiving and distributing electrical energy, with the main switch inside the cabinet being an SF6 switch.

Benefits of Switchgear

Highly integrated, space-saving

Various components are integrated into a single cabinet, featuring a compact structure that reduces floor space requirements and enables quick installation and deployment.

Multiple protection measures

Vacuum circuit breakers provide rapid tripping to quickly interrupt short-circuit currents. Combined with microprocessor-based protection devices and fuses, this setup prevents overload faults. The multi-layered protection system safeguards operators from accidents caused by misoperations.

Convenient intelligent operation

The cabinet is equipped with a processor, allowing direct and intuitive data viewing. It supports remote operation, making it convenient for operators to use.

Good economic benefits

The modular design facilitates maintenance, with a simple structure that is easy to maintain, reducing maintenance costs. Quick repairs minimize downtime losses.