Distributed power supply system of relay protection device

Abstract

The invention discloses a distributed power supply system of a relay protection device. In the power supply system, a primary power source module is designed with two paths of separated 24V DC voltage outputs, wherein one path of output is used for internal power supply and the other path of output is used for external power supply. The path of output used for internal power supply is output to each functional insert (module) via a power source bus, and then the internal 24V DC is converted to be at a voltage level needed by the functional module via a secondary power source conversion module. Through the distributed power supply system of the relay protection device, some problems of a centralized power supply are effectively solved; the design complexity of the primary power source module is simplified and the reliability and the design reusability of the power supply are improved; and meanwhile, the backplane resource of the relay protection device is saved and the development cycle of the product is shortened.

Description

technical field [0001] The invention belongs to the field of power system relay protection, and in particular relates to a brand-new power supply system for a relay protection device, which can be widely used in various relay protection devices in the power system, and can also be extended to power supply schemes for other equipment types in the power system field . Background technique [0002] In the relay protection device of the power system, the centralized power supply method is currently used; that is, an independent power plug-in (or module) is used to convert the external 48VDC, 110VDC, 220VDC or even AC into the 5V, ±12 ( 15)V and 24V, and then use these output power supplies on various functional plug-ins (modules) through the backplane bus or power line. On each functional plug-in, the DC / DC module conversion mode is only used when the power supply other than the above-mentioned voltage levels, such as 3.3V, is used. [0003] The current centralized power suppl...

AI Technical Summary

Problems solved by technology

[0004] 1. There are many output channels and voltage levels of the power supply, the output voltages of each channel need to be isolated, the design is complicated, and the overall reliability of the power supply is reduced

[0005] 2. There are many output channels of the power supply, the internal inherent power loss remains high, the heat of the power plug-in part is concentrated, and the working temperature rises

[0006] 3. The power supply has many output voltage circuits, multiple voltage levels, poor design reusability, high frequency of customized development, and long product development cycle

[0008] 5. The power supply part of each functional plug-in is directly connected. When a power supply fails, it may cause abnormal operation of all plug-ins. In severe cases, it may cause abnormal operation of the device or even malfunction.

For example, when there are two CPU plug-ins, if there is a problem with the power supply system of the analog circuit, the sampling part of the dual plug-ins will be affected, and the sampling will be abnormal.

[0009] 6. With the increase of device functions, especially the number of optical fiber communication interfaces required in the intelligent station is very large, the requirements for the power supply of the 5V digital part of the device are getting higher and higher, and some peak power has exceeded 50W

In this way, the current exceeding 10A must be transmitted on the backplane power bus, and the influence of voltage drop and contact resistance on the power bus has to be considered, and the design efficiency of the entire system is low;

[0010] 7. Due to the large number of power output channels, the power of some circuits is relatively large, and the number of pins on the backplane bus occupied by the power supply part is large, which affects the overall design of the device and is susceptible to interference

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