Relay protection method and device
A relay protection and relay technology, applied in relays, instruments, circuits, etc., can solve the problems of relay main contact life loss, damage to relays, fire, etc., so as to avoid relay failure and improve high-voltage safety and reliability.
Active Publication Date: 2021-09-03
GUANGZHOU XIAOPENG MOTORS TECH CO LTD
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Problems solved by technology
The relay responsible for switching on and off the high-voltage circuit will lose the life of the main contact of the relay after repeated high-load cut-offs. Once the life of the main contact of the relay ends, it is easy to cause high temperature damage to the relay, and even cause risks such as fire.
The existing scheme uses the impedance of the main contact of the relay to evaluate the life. When the impedance of the main contact of the relay is greater than a certain value, it is regarded as the end of the life of the main contact of the relay. However, abnormal conditions of the main contact of the relay will also cause an abnormal increase in impedance. Large, this solution evaluates the life of the main contact of the relay is unstable, which is easy to cause wrong judgments and cause the relay to send wrong information
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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0052] In order to make the description of the present disclosure more detailed and complete, the following provides an illustrative description of the implementation modes and specific examples of the present invention; but this is not the only form for implementing or using the specific embodiments of the present invention. The description covers features of various embodiments as well as method steps and their sequences for constructing and operating those embodiments. However, other embodiments can also be used to achieve the same or equivalent functions and step sequences.
[0053]Th...
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The present invention relates to the technical field of life evaluation of relays, and in particular to a relay protection method and device. The relay protection method includes the following steps: collecting the working conditions when the relay is cut off with load, and the working conditions include relay circuit current signals and power The real-time voltage value signal of the battery; evaluate the life loss ratio of the main contact of the relay according to the working condition; calculate the remaining life ratio of the main contact of the relay according to the life loss ratio of the main contact of the relay; determine Whether the remaining life ratio of the main contact of the relay is less than a preset value; if so, an alarm signal is sent. The embodiment of the present invention evaluates the remaining life ratio of the main contacts of the relay by collecting the data when the relay is cut off on load. When the relay is at the end of its life, the relay can be repaired or replaced in time to avoid more serious consequences caused by the failure of the relay. , Improve high voltage safety and reliability.
Description
technical field [0001] The invention relates to the technical field of life evaluation of relays, in particular to a relay protection method and device. Background technique [0002] The high-voltage safety of the power battery assembly is currently a difficult point in the design of new energy vehicles. The relay responsible for switching on and off the high-voltage circuit will lose the life of the main contact of the relay after multiple high-load cut-offs. Once the life of the main contact of the relay ends, it is prone to high temperature damage to the relay, and even causes risks such as fire. The existing scheme uses the impedance of the main contact of the relay to evaluate the life. When the impedance of the main contact of the relay is greater than a certain value, it is regarded as the end of the life of the main contact of the relay. However, abnormal conditions of the main contact of the relay will also cause an abnormal increase in impedance. Large, this schem...
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IPC IPC(8): H01H47/00G08B21/18
CPCG08B21/18H01H47/002
Inventor 郑小凯王杭挺李林李碧雄李玉杰徐峰
Owner GUANGZHOU XIAOPENG MOTORS TECH CO LTD