CN101967997A - Method for recording incident for overspeed protection of steam turbine - Google Patents

Abstract

The invention discloses a method for recording an incident for overspeed protection of a steam turbine. The method is characterized by comprising the following steps of: 1) arranging an external standard clock timing interface and a system internal clock transferring interface in an overspeed protection device; 2) timing a self-build analog clock inside a steam turbine overspeed protection control module in a steam turbine digital electro-hydraulic system (DEH system) by a communication administrator after a controller receives the external standard clock of a clock server; 3) recording the called analog clock accurate time and generated SOE incident by the steam turbine overspeed protection control module when the rotating speed of the steam turbine reaches a warning value and a warning signal is sent out, and uploading the incident to a central monitor system by the controller so as to analyze the cause of chain actions of the system. The method can realize SOE record of the overspeed incident of the steam turbine, and the record is saved in a speed measuring device and can be transmitted to the central monitor system in a communication mode for analysis.

Description

A kind of event recording method of turbine over

Technical field

The present invention relates to the event recording method of a kind of turbine over of digital electro-hydraulic regulating system for steam turbine (vehicle economy H), specifically be applicable in the overspeed protection module of 600MW and following steam turbine of thermal power plant, feed pump turbine.

Background technique

In the digital electro-hydraulic control system (vehicle economy H) of steam turbine of thermal power plant, feed pump turbine, relate to the measurement of turbine speed; turbine speed exceed rated speed 103% and 110% o'clock; speed measurement device need provide alarm signal; send turbine emergency security system (ETS) to the quick closedown solenoid valve, realize stoppage protection.

Present big-and-middle-sized fired power generating unit has realized the integrated control of boiler, steam turbine, generator; wherein relate to a large amount of mutual interlock protection actions; this interlocking action is often finished in several milliseconds; therefore do not moving under the situation of time of origin (incident) record; the analysis of the accident of giving brings inconvenience, and can not effectively discern the reason that causes that system's interlocking action takes place.

Home and abroad existing DEH system is finished by the PLC system, and tachometric survey is finished to improve the security of system reliability by three cover speed measurement devices respectively.This pattern only need provide correct alarm signal when turbine speed exceeds the speed limit, and the time of this anomalous event not being taken place is carried out logout.

Summary of the invention

The event recording method that the purpose of this invention is to provide a kind of turbine over; when turbine speed reaches alarming value and provides alarm signal; the time of origin that should exceed the speed limit is noted simultaneously; to realize the SOE record of steam turbine hypervelocity incident, this record is retained in the speed measurement device and can be delivered to central monitoring system so that analyze by communication mode.

For realizing purpose of the present invention, the invention provides a kind of event recording method of turbine over, it is characterized in that: may further comprise the steps:

1) in overspeed governor switch, increase external perimysium reference clock (GPS) to the time interface and internal system clock passing interface, unified with the logout markers and the whole system markers that guarantee native system;

2) controller receive behind the external perimysium reference clock of clock server by communications manager to the inner self-built simulated clock simulation clock of the turbine over control module in the digital electro-hydraulic regulating system for steam turbine (DEH system) carry out to the time;

3) since the inner self-built simulated clock simulation clock of turbine over control module to the time after operation always; so when turbine speed reaches alarming value and provides alarm signal; the turbine over control module accesses the simulated clock simulation clock correct time and generates the SOE incident and carries out record; this logout is uploaded to central monitoring system by controller, so that analyze the occurrence cause that causes system's interlocking action.

The beneficial effect that the present invention reached: the present invention is when turbine speed reaches alarming value and provides alarm signal, the time of origin that should exceed the speed limit is noted simultaneously, can realize the SOE record of steam turbine hypervelocity incident, this record is retained in the speed measurement device and can be delivered to central monitoring system so that analyze by communication mode.

Description of drawings

Fig. 1 is a DEH system multi-event sequence recording station schematic representation.

Embodiment

As shown in Figure 1, be DEH system multi-event sequence recording station schematic representation, with a main website of system, two pairs of middle controllers, four OPC modules is example, gps system is linked to each other with process controller, thereby obtain the time tag of gps clock, each middle controller also send simultaneously to the time signal give OPC module in the DEH system of hanging down, the OPC module according to receive to the time signal calibration its inner millisecond clock.

When the steam turbine protection signal was exported, the OPC module was packaged into complete SOE logout active upload with the state that takes place on contact manager and process controller with corresponding clock sign.Contact manager and process controller are accurately accepted to return acknowledgement frame by communication message behind this SOE logout.As not producing acknowledgement frame, then the OPC module continues to repeat to upload this SOE incident, and after this incident accurately transmitted, OPC module logout pointer pointed to bar logout down automatically.Can roll and preserve all SOE logouts in OPC module inside, also can not lose under the dead electricity situation simultaneously.

Advantage of the present invention is turbine over to be moved time of origin (incident) note, with the convenient accidents such as the occurrence cause that causes system's interlocking action and relevance of analyzing.

Technical term:

Central monitoring system: refer to the monitoring master station in the supervisory system, generally constitute by large computer system.

Middle controller: referring to has a top-grade computer Intelligent Information Processing unit that constitute, built-in operation system in the control system.

Contact manager: refer to the average information crosspoint that DEH that some middle controllers and its are associated is connected by network

Digital electro-hydraulic control system: vehicle economy H, form by computer control part and EH hydraulic actuator, comprise OPC and VCC.

Turbine over control module: be called for short OPC; detect turbine speed; and judging whether to surpass overspeed protection and control setting value, this module also has removal of load prediction (LDA) function, power-load unbalanced (PLU) function etc. simultaneously, and can realize on-line operation overspeed protection test.

Below only the present invention is described further with most preferred embodiment, and so it is not a limitation of the invention, and protection scope of the present invention is as the criterion with the content that is illustrated in claim.

Claims (1)

1. the event recording method of a turbine over is characterized in that: may further comprise the steps:

1) in overspeed governor switch, increase the external perimysium reference clock to the time interface and internal system clock passing interface, unified with the logout markers and the whole system markers that guarantee native system;

2) controller receive behind the external perimysium reference clock of clock server by communications manager to the inner self-built simulated clock simulation clock of the turbine over control module in the digital electro-hydraulic regulating system for steam turbine carry out to the time;

3) since the inner self-built simulated clock simulation clock of turbine over control module to the time after operation always; so when turbine speed reaches alarming value and provides alarm signal; the turbine over control module accesses the simulated clock simulation clock correct time and generates the SOE incident and carries out record; this logout is uploaded to central monitoring system by controller, so that analyze the occurrence cause that causes system's interlocking action.

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