JPS63235602A - Turbine rotational speed digital converter - Google Patents

Abstract

PURPOSE:To reduce errors by subjecting a pulse signal corresponding to a turbine rotational speed to A/V conversion so as to be sent to the rotational setting circuit of mechanical trip/electrical trip besides a control system and a rotational sped digital indicator so that setting per rotation is made possible. CONSTITUTION:A pulse signal from a detection magnet attached to the rotary portion of a turbine is inputted in a pulse counter 4 through a digital converter 2 and a corrugation forming circuit 3. The pulse signal is counted at a defined time interval here so that the counted value is outputted to a distributor 5 as a digital signal showing the rotational speed of the turbine. From the distributor 5, the digital signal is distributively outputted to a turbine rotational speed display circuit as a display data 6 and to calculating machine A, B which control the rotational action of the turbine as control data 7a, 7b. In addition, it is outputted as a signal 8 for electrical trip/mechanical trip test mode through an adder 9 to a comparator 12 which set a rotational speed at the time of every test mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a turbine rotation speed digital converter applied to a turbine rotation digital control device.

[Prior Art] A control device that controls the rotation speed of a turbine detects the rotation speed of the turbine and performs control according to the detected rotation speed data. In this case, conventionally, the signal taken out from the rotation speed detector of the turbine was converted into an analog value voltage signal, and the signal was input into a control system that performs digital processing.

[Problems to be Solved by the Invention] However, when RV control is performed based on an analog voltage signal as described above, it is difficult to perform accurate control due to errors in the signal, and the control system is Even if digital processing is performed, its characteristics cannot be utilized.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a turbine rotation speed digital converter that converts a turbine rotation detection signal into a digital value and then sends it to a subsequent control system and others. .

[Means and effects for solving the problem] The present invention converts a pulse signal from a magnet detector that detects the rotation of a turbine into a digital value and sends it to a subsequent control system and a rotation speed digital display. , electrical trip (HOS
It is also sent to the comparator that sets the rotation speed during the T)/mechanical trip (MOS T) test mode, making it possible to set it for each rotation, minimizing errors and making it possible to correspond to the rotation speed of the turbine. Various precise processing operations can be performed.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows its main circuit configuration. A pulse signal (PI) 1 from a detection magnet (not shown) attached to the rotating part of the turbine is input to a digital converter 2, and is first processed into a waveform shaping circuit 3 to form a waveform. After being shaped, it is sent to the pulse converter 4. The pulse counter 4 counts the sent pulse signals at predetermined time intervals and outputs the count value to the distributor 5 as a digital signal indicating the rotation speed of the turbine. The distributor 5 distributes and outputs the digital signal from the pulse counter 4 to a downstream turbine rotation speed display circuit as display data 6, and to computers A and B that control the rotational operation of the turbine as control data 7a and 7b, respectively. On the other hand, this digital signal is also distributed and output to an adder 9 as a HOST (electrical top)/MO8T (mechanical trip) test mode signal 8. Adder 9
Then, according to the input HO3T signal IO, the EO8T/MO8T test mode signal 8 from the distributor 5 and +10%
An addition operation is performed on the bias setting data ll, and the addition result is sent to the comparator 12. A mode signal 13 indicating whether the turbine operation mode is HOST mode or MO8TO8 upper mode is input to this comparator 12, and according to this mode signal 13, the set rotation speed data 14a at the time of MOST test and Select one of the EOST setting rotation speed data 14b, and add the selected data and the adder 9.
The HOST operation signal 15 is output if the input rotation speed is larger than the input rotation speed.

[Effects of the Invention] As described above, according to the present invention, the pulse signal from the magnet detector that detects the rotation of the turbine is converted into a digital value and sent to the subsequent control system and the rotation speed digital display. At the same time, it is also sent to the comparator that sets the rotation speed during the electrical trip (HOST)/mechanical trip (MOS T) test mode, and since it is possible to set the rotation speed for each rotation, the error is extremely small, with an error of ±1 rotation. It is possible to provide a turbine rotational speed digital converter that is smaller and can more accurately execute various processing operations corresponding to the rotational speed of the turbine.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention. 1...Pulse signal, 2...Digital converter, 3...
- Waveform shaping circuit, 4...Pulse counter, 5...Distributor, 9...Adder, 12...Comparator.

Claims (1)

[Scope of Claims] A detection magnet that detects the rotation speed of the turbine and outputs it as a pulse signal, a conversion means that converts the pulse signal from the detection magnet into a digital value, and a digital signal output from the conversion means that is transmitted to a subsequent stage. 1. A turbine rotational speed digital converter comprising: a control circuit for controlling a turbine rotational speed, a digital display circuit for a turbine rotational speed, and a distributor for distributing output to a rotational speed setting circuit for a mechanical trip/electrical trip.