Power system transformer is a high voltage, high current information transmission to low voltage, small current secondary side of the measurement, measuring instruments and relay protection, automatic device of a special transformer, is a system and secondary system Of the contact components, the primary winding access to the grid, the secondary winding, respectively, and measuring instruments, protective devices, etc. connected to each other. The transformer can measure the voltage, current and electric energy of the primary system with the measuring instrument and the measuring device. It can cooperate with the relay protection and the automatic device to form the electrical protection and automatic control of the various faults of the power grid. Transformer performance is good or bad, a direct impact on the power system measurement, measurement accuracy and relay protection device action reliability.
Transformer is divided into voltage transformer and current transformer two categories, its main role: the primary system voltage and current information accurately transmitted to the secondary side of the relevant equipment; a system of high voltage, high current into two Secondary voltage (standard value), small current (standard value), so that measurement, measuring instruments and relays and other devices standardization, miniaturization, and reduce the secondary equipment insulation requirements; the secondary equipment and secondary System and a system of high-voltage equipment in the electrical aspects of a good isolation, thus ensuring the secondary equipment and personal safety.
[Edit this paragraph] Transformer classification
Transformer is divided into two categories of voltage transformers and current transformers. The voltage transformer can be used for voltage and power measurements in high voltage and ultrahigh voltage power systems. Current transformers can be used in the exchange of current measurement, the exchange of electrical power measurement and power drag line protection.
Voltage transformer classification
By use points
Measure the voltage transformer (or the voltage transformer of the measurement of the winding. In the normal voltage range, to the measurement, measurement device to provide grid voltage information.
Protection voltage transformer (or voltage transformer protection winding. In the power failure state, to the relay protection and other devices to provide power failure voltage information.
According to insulation medium
Dry voltage transformer. Insulated paint from ordinary insulating material as insulation, used in and below the low voltage level.
Pouring insulation voltage transformer. By epoxy resin or other resin mixed material casting molding, used in and below the voltage level.
Oil - immersed voltage transformer. Insulated paper and insulating oil as insulation, is China's most common structural type, commonly used and the following voltage level.
Gas insulated voltage transformer. Insulated by the main gas, used in the higher voltage level.
The low voltage transformer, which is typically designed for measurement, is dry, high pressure or high pressure sealed gas insulated (eg sulfur hexafluoride). Pouring for 35kV and below the voltage transformer, 35kV above the products are oil-immersed.
According to the number of points
The vast majority of products are single-phase, because the voltage transformer capacity is small, the body volume is not large, three-phase high-voltage casing between the internal and external insulation requirements difficult to meet, so only 3-15kV products sometimes use three-phase structure.
According to the principle of voltage conversion
Electromagnetic voltage transformer. According to the principle of electromagnetic induction conversion voltage, the principle and the basic structure and the transformer is completely similar to our country and the following voltage level used.
Capacitive voltage transformer. It is composed of capacitive voltage divider, compensating reactor, intermediate transformer, damper and carrier protection gap. It is used for voltage measurement, power measurement, relay protection and carrier communication in neutral grounding system.
Photoelectric voltage transformer. Through the principle of photoelectric conversion to achieve voltage conversion, is still under development.
According to the use of conditions
Indoor voltage transformer. Installed in the indoor power distribution device, generally used in the following and voltage level.
Outdoor voltage transformer. Installed in the outdoor power distribution device, used in and above the voltage level.
Press the winding to run the state
One winding earth voltage transformer. Single-phase voltage transformer primary winding or three-phase voltage transformer primary winding of the neutral point directly grounded.
A winding is not grounded voltage transformer. Single-phase voltage transformer primary winding two terminals are insulated; three-phase voltage transformer primary winding parts, including the terminal are insulated to the ground, and the insulation level and the rated insulation level.
According to the magnetic structure of the points
Single stage voltage transformer. A winding and the secondary winding (according to the need to set a number of secondary winding with a core on the core, the core for the ground potential in China and the following voltage levels are single-stage.
Cascade voltage transformer. The primary winding is divided into several turns of the same unit connected in series between the phase and the ground, each unit has its own independent core, with a number of cores, and the core with a high voltage, secondary winding (according to the need Set a number of secondary windings in the last one connected with the ground. China is currently used in the voltage level of this structure type.
By the combination of voltage transformers and current transformers and the formation of one of the transformers known as the modular transformer, but also with the combination of electrical production of the transformer known as the modular transformer.
Current transformer classification
By use points
Measurement current transformer (or current transformer measurement winding. In the normal operating current range, to the measurement, measurement and other devices to provide power grid current information.
Protection current transformer (or current transformer protection winding. In the power failure state, to the relay protection and other devices to provide power grid fault current information.
According to insulation medium
Dry current transformer. Insulated by ordinary insulating material by dipping treatment.
Pouring current transformer. A current transformer molded with epoxy or other resin blends.
Oil immersed current transformer. Insulated paper and insulating oil as insulation, usually for outdoor type. At present, China in a variety of voltage levels are commonly used.
Gas Insulated Current Transformer. The main insulation is made of gas.
According to the principle of current conversion points
Electromagnetic current transformer. Current Transformer Based on Electromagnetic Induction Principle.
Photoelectric current transformer. Through the principle of photoelectric conversion to achieve the current transform of the current transformer, is still under development.
According to the installation method points
Through current transformer. A current transformer used to pass through a panel or wall.
Pillar current transformer. A current transformer mounted on a flat or pillar and used as a circuit conductor.
Casing Current Transformer. There is no current conductor and a current insulation, directly set in the insulation of the casing on a current transformer.
Bus current transformer. There is no conductor but once insulated, directly set on the bus used in a current transformer.
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