Power supplying method of distribution type duplex power sources

Abstract

The invention takes following measures: station power supply and voltage transformer together provide voltage source so as to reduce burden of voltage transformer; based on properties of load to classify outputs; different combinations among station power supply, voltage transformer and current transformer undertake power supply for auxiliary function, and key protection measuring and controlling function respectively; using cascade connected mode for output ends of rectifier realizes voltage stabilized output of current source. Advantages are: no need of the dedicated current transformer, and ferro resonance type voltage stabilizer, in which secondary rated current is small current; maintaining and satisfying requirement for source power by protection measuring and controlling device in full functional electric system in middle and low voltage; guaranteeing stabilized output of current source under each short trouble within protection range.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and more precisely, the invention relates to a method for distributed multiple power supply. Background technique [0002] In the power system, in order to ensure safe and reliable operation, various relay protection, electrical measurement and automatic control equipment (referred to as protection measurement and control devices) are equipped to measure and automatically adjust operating parameters and detect and remove faults in the power system. , such as overcurrent protection relays, automatic reclosing devices, etc. [0003] It is necessary to supply power to the protection measurement and control devices to ensure their normal operation, but it cannot simply use the ordinary AC power supply in the power plant or substation (referred to as the station power supply) for power supply, because when the power system fails, the station power supply may also disappear. Therefore...

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Problems solved by technology

The main problem with this method is that a group of transformers is required to be dedicated to power supply, and auxiliary equipment such as ferromagnetic resonance voltage stabilizers must be used.

The main problem of this method is: since the ferromagnetic resonant voltage stabilizer is not used in the device to stabilize the voltage, this method requires that the main current transformer used is not a common current transformer with standard output, and the twenty-second rated current is very small dedicated current transformer

In addition, when the voltage source uses a voltage transformer, in order to make the output voltage of the voltage transformer within the allowable error range, the burden of the voltage transformer must be controlled. Therefore, the auxiliary functions (such as display and communication functions) of the protection measurement and control device must be simple. In order to ensure the low power consumption of the device, the dual power supply cannot supply power for the protection and control device with general functions

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