Three - phase outdoor voltage transformers for industrial grids are important electrical equipment in power systems, mainly used for voltage measurement, protection, and control in high - voltage power transmission lines and substations of industrial grids4. The following is an introduction to them:
Based on the principle of electromagnetic induction, three - phase outdoor voltage transformers for industrial grids induce the voltage of high - voltage lines on one side of the transformer to the other side, so that the secondary side generates a voltage signal proportional to the primary side. In order to ensure safety and measurement accuracy, components such as resistors, inductors, or capacitors are set in the transformer to couple or suppress interference.
Epoxy Resin Casting Structure: Many outdoor voltage transformers adopt an epoxy resin casting insulation structure, such as the JDZW - 10 and JDZXW - 10 types3. This structure has the advantages of arc resistance, ultraviolet resistance, aging resistance, and long service life3. It is also compact in size and light in weight, suitable for installation in any position and direction3.
Umbrella - Shaped Skirt Design6: The appearance of the transformer is designed with umbrella - shaped skirts, which can increase the surface creepage distance, improve the ability to resist pollution and moisture, and are suitable for use in harsh outdoor environments.
Terminal Protection: The secondary terminal is equipped with a wiring protection cover to prevent electric shock and short - circuit accidents3. At the same time, measures such as sealing can be taken to prevent theft of electricity3.
Oil - Immersed Voltage Transformers: Insulating oil is immersed between the core and winding of the transformer to improve insulation strength and thermal stability. The advantages are good insulation performance and high heat dissipation efficiency, which are suitable for high - voltage and high - capacity applications. However, they require regular inspection and maintenance of the oil level and oil quality, and there is a risk of oil leakage.
Dry - Type Voltage Transformers: The windings are wrapped with insulating materials to prevent external dust and moisture from entering. The advantages are fire - resistance, moisture - resistance, and low maintenance requirements. They are suitable for use in environments with high fire - protection requirements and relatively dry conditions. But their heat dissipation performance is relatively poor, and the capacity and voltage level are limited.
Rated Voltage: It refers to the voltage level at which the transformer is designed to operate, such as 10 kV, 35 kV, etc. For example, the rated voltage of the GFJSZW - 3, 6, 10WF five - pole outdoor three - phase voltage transformer can be 3 kV, 6 kV, or 10 kV5.
Accuracy Class: Indicates the accuracy of the transformer in measuring voltage, such as 0.2, 0.5, 1, 3, 3P, 6P, etc5. The higher the accuracy class, the smaller the measurement error.
Rated Load: The rated output capacity of the transformer, usually expressed in volt - amperes (VA). For example, the rated load of the GFJSZW - 3, 6, 10WF transformer is ≤ 3 × 600 VA5.
Power Plants and Substations: Used for voltage measurement and monitoring in power plants and substations, providing data support for the operation and control of power systems.
Industrial and Mining Enterprises: Meet the voltage measurement and protection needs of industrial and mining enterprises, ensuring the safe and stable operation of production equipment.
Railways, Oil and Gas Companies: Applicable to voltage - related applications in special industries such as railways, oil and gas, and provide reliable voltage signals for the operation of related equipment.
