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Function module capable of preventing protection misoperation caused by analog quantity signal hopping

An analog signal, protection function technology, applied in emergency protection circuit devices, emergency protection devices with automatic disconnection, logic circuits with logic functions, etc. Water shortage and other problems, to facilitate maintenance, ensure safe and economical operation, and avoid unit tripping

Inactive Publication Date: 2013-11-20
高利斌
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On April 19, 2013, when the maintenance personnel of a 660MW unit in a power plant were dealing with a door failure of the water level signal of the deaerator, the water level signal of the two deaerators jumped sharply to the maximum range, and then immediately fell below zero in an instant. When the water level of the boiler is lower than 600mm, the protection signal of the steam-driven feedwater pump is sent out, and a trip signal of the steam pump is output through a two-out-of-three functional module. Due to the emergency trip of the steam pump, the boiler MFT acts after a certain delay due to the lack of water in the boiler, and the unit trips urgently

Method used

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  • Function module capable of preventing protection misoperation caused by analog quantity signal hopping
  • Function module capable of preventing protection misoperation caused by analog quantity signal hopping
  • Function module capable of preventing protection misoperation caused by analog quantity signal hopping

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Embodiment Construction

[0019] The specific implementation of the patent of the present invention is: the analog signal is converted into two switch signals after passing through two limit circuits 1 and 2, that is, an alarm signal and a protection trip signal. The specific connection circuit is as follows:

[0020] The alarm signal is divided into three ways, one way is directly used as the alarm output signal of the protection function module; one way passes through the AND gate circuit 1 and then after a delay to connect the circuit 1 (delay time 3 seconds), the S terminal of the RS flip-flop is set. , the output of the RS flip-flop is divided into two paths, one path is connected to an input terminal of AND gate circuit 4 as an input condition for allowing the protection trip signal, and the other path is connected to an input terminal of NOT gate circuit 1 and AND gate circuit 2 as a cancellation Conditions for protecting the trip signal and blocking the alarm signal; the third alarm signal is co...

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Abstract

The invention relates to a function module capable of preventing protection misoperation caused by analog quantity signal hopping. According to the invention, in allusion to the condition that a power unit trips because of instant hopping of analog quantity signals in the production process, the function module is developed to prevent the protection misoperation caused by signal instant hopping by using a logical configuration function of application software in a DCS computer control system. When instant hopping occurs in the analog quantity signals, the protection function module can retreat the analog quantity signals from a computer control logical operation circuit timely and alarm, thereby being capable of avoiding occurrence of the condition that the equipment trips because of hopping of one analog quantity signal. The protection function module provided by the invention can be widely applied to input circuits of the computer control system.

Description

technical field [0001] The patent of the present invention relates to a functional module for preventing protection malfunction caused by analog signal jumps, specifically a logic circuit module developed and generated by application software in a DCS computer control system. Background technique [0002] At present, in the application software provided by DCS computer control system manufacturers, the function of judging the quality of analog signal is generally designed, but there is no logic control circuit designed to prevent the protection from malfunction caused by the instantaneous jump of analog signal. In the actual production process, Due to the abnormality of the on-site measurement signal or manual misoperation and other reasons, the instantaneous jump of the analog signal caused by the unit tripping occurs from time to time, such as: [0003] On May 7, 2011, during the normal operation of a 350MW unit in a power plant, the signal of a feed water flow transmitter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/20H02H5/08
Inventor 高利斌
Owner 高利斌
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