Protecting-two-of-three redundancy monitoring circuit
A redundant monitoring and circuit technology, used in emergency protection circuit devices, measuring electricity, measuring electrical variables, etc., can solve the problems of high requirements for monitoring units, complex circuits, and inconvenient design of control and protection systems, and achieve simple wiring and reliable work. Effect
Active Publication Date: 2010-11-24
CHINA XD ELECTRIC CO LTD
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Problems solved by technology
[0003] Usually, the monitoring of the three guarantees and two designs mostly uses a dedicated monitoring unit. The monitoring unit uses logical judgment to complete the monitoring function of the three guarantees and two designs. The circuit is complex and has high requirements for the monitoring unit, which brings inconvenience to the design of the control and protection system.
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[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0013] see figure 1 As shown, three light-emitting units are arranged in the valve-based electronic equipment cabinet, which are respectively the first light-emitting unit U1, the second light-emitting unit U2 and the third light-emitting unit U3. U1 , U2 and U3 are correspondingly provided with a first detection module J1 , a second detection module J2 and a third detection module J3 for detecting whether the corresponding light emitting units are working normally.
[0014] The three-guarantee two-redundancy monitoring circuit of the present invention includes three first relays S1, second relays S2 and third relays S3 respectively arranged on three light emitting units U1, U2 and U3, and the first relay S1 is provided with a first The state contact switch S11 and the second state contact switch S12, the second relay S2 is provided with the third state cont...
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The invention provides a protecting-two-of-three redundancy monitoring circuit, which is used for monitoring working states of three working units. The three working units are provided with three relays, each relay is provided with two state contact switches which are connected with the state contact switches of the other two relays in series and then connected between two wire outlet ends of the monitoring circuit in parallel; each of the three working units is provided with a detection module which is connected with the corresponding relay and used for detecting whether the corresponding working unit normally works; if the working unit normally works, the detection module controls the two contact switches of the corresponding relay to be closed at the same time; if the working unit abnormally works, the detection module controls the two contact switches of the corresponding relay to be opened at the same time; and whether the three working units meet the requirements of normal working can be easily judged by monitoring the current between the two wire outlet ends. The monitoring circuit has the advantages of easy wiring and reliable working.
Description
technical field [0001] The invention relates to a redundant monitoring circuit, in particular to a three-guarantee-two redundant monitoring circuit. Background technique [0002] There are three light emission units in the valve base electronic equipment cabinet for DC transmission converter valves. In order to achieve sufficient energy, at least two of the three light emission units are required to work at the same time. The three-guarantee and two-redundancy monitoring circuit is used to monitor the three-guarantee and two-redundancy design of the light emitting unit in the valve-based electronic equipment cabinet, which is very important for the reliable operation of the DC transmission system. [0003] Usually, the monitoring of the three guarantees and two designs mostly uses a dedicated monitoring unit. The monitoring unit uses logical judgment to complete the monitoring function of the three guarantees and two designs. The circuit is complex and has high requirements ...
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IPC IPC(8): H02H7/20G01R19/00G01R31/02
Inventor 陈干郑小红
Owner CHINA XD ELECTRIC CO LTD