CN201629559U

CN201629559U - Turbine over-speed protection device with automatic self-detecting function

Info

Publication number: CN201629559U
Application number: CN2010201268058U
Authority: CN
Inventors: 吴锦伟; 曹端德; 沃丽平
Original assignee: HANGZHOU ZHEDAWELL TECHNOLOGY Co Ltd
Current assignee: HANGZHOU ZHEDAWELL TECHNOLOGY Co Ltd
Priority date: 2010-03-09
Filing date: 2010-03-09
Publication date: 2010-11-10
Anticipated expiration: 2020-03-09

Abstract

The utility model discloses a turbine over-speed protection device. A speed detecting circuit of the turbine over-speed protection device at least comprises a single chip microcomputer, a sensor signal regulating circuit and an input device. An output end of the sensor signal regulating circuit is connected with the single chip microcomputer. The input device is connected with the single chip microcomputer. The speed detecting circuit further comprises a self-detecting signal generating circuit. The self-detecting signal generating circuit comprises a pulse signal generating circuit and an input signal selection circuit. An input end of the pulse signal generating circuit is connected with the single chip microcomputer, and an output end of the pulse signal generating circuit is connected with an input end of the input signal selection circuit. An output end of the sensor signal regulating circuit is connected with the input end of the input signal selecting circuit. An output end of the input signal selection circuit is connected with the single chip microcomputer. The turbine over-speed protection device simulates rotation speed signals, detected via a sensor, of a turbine by a self-contained analogue signal generator, and realizes self-detection function under the condition of not relying on special working state of the turbine.

Description

TURBINE OVERSPEED PROTECTION DEVICE with automatic self-checking function

Technical field

The utility model relates to a kind of TURBINE OVERSPEED PROTECTION DEVICE.

Background technology

The abnormal conditions of over speed of rotation can appear in steam turbine in running, thereby should make this moment tripgear tripping operation finish protection to steam turbine rapidly.Adopted overspeed tripping device in order to be implemented in steam turbine when hypervelocity tripping operation automatically in the prior art, for example the notification number of authorizing on August 10th, 2005 is that the Chinese patent of CN2716510Y discloses the control device of patent name for the tripping operation of nanosecond turbine emergency.It comprises plurality of sensors, bus, drive circuit and tripper, it also comprises the I controller, the II controller, III controller and two-out-of-three circuit module, the output of each transducer is an end of connecting bus respectively, the other end of bus connects the I controller respectively, the input of II controller and III controller, the I controller, the output of II controller and III controller is connected three inputs of two-out-of-three circuit module respectively, the output of two-out-of-three circuit module connects the input of drive circuit, and the output of drive circuit connects the input of tripper.Though the control device of this nanosecond turbine emergency tripping operation has been realized automatic monitoring and automatic trip execution work, but when using, reality has very big deficiency, especially the checked operation of control device self the overspeed protection function that after installation the nanosecond turbine emergency is tripped bothers very much, just must start steam turbine and allow the rotating speed rising of steam turbine exceed default limit value because check the control device of nanosecond turbine emergency tripping operation when steam turbine exceeds the speed limit, normally trip, control device detect turbine speed greater than limit value after steam turbine illustrate then that as if quitting work control device can normally play the function of overspeed protection; If steam turbine is still worked and is illustrated that then problem has appearred in control device.

Manual self checking method like this implements needs the steamer function normally to start, so test condition is higher; So manual self checking method implements simultaneously needs to open steam turbine, causes inspection cost to strengthen; Need certain hour because steam turbine starts, reaching required rotating speed also needs certain hour, and stopping the steam turbine rotation also needs certain hour, and therefore round of visits is long when doing checked operation continuously.Existence condition height when in the prior art device that is used for turbine over being carried out the checked operation of overspeed protection function, cost is big, the cycle is long, labour intensity is big, inefficient shortcoming.

Summary of the invention

The technical problems to be solved in the utility model provides a kind of TURBINE OVERSPEED PROTECTION DEVICE; this protective device can be finished the work for inspection to the overspeed protection function of self automatically when halt turbines, also can finish the work for inspection to the overspeed protection function of self when steam turbine is worked automatically.

For solving the problems of the technologies described above; the utility model adopts following technical scheme: this TURBINE OVERSPEED PROTECTION DEVICE comprises three groups of velocity checking circuits that work alone; three select two circuit; the protection executive circuit; the output of described velocity checking circuits all selects the input of two circuit to be connected with three; described three select the output of two circuit to be connected with the input of protection executive circuit; described velocity checking circuits comprises single-chip microcomputer at least; sensor signal is adjusted circuit and input equipment; the output that described sensor signal is adjusted circuit is connected with single-chip microcomputer; described input equipment is connected with single-chip microcomputer; described velocity checking circuits also comprises from detecting signal generating circuit; the described signal generating circuit that detects certainly comprises pulse signal generation circuit and input signal selection circuit; the input of described pulse signal generation circuit is connected with single-chip microcomputer; the output of described pulse signal generation circuit selects the input of circuit to be connected with input signal; described sensor signal is adjusted the output of circuit and is selected the input of circuit to be connected with input signal, and described input signal selects the output of circuit to be connected with single-chip microcomputer.The utility model by certainly detect signal generating circuit simulate steam turbine when rotating sensor signal adjust electric circuit inspection to signal; check single-chip microcomputer inside to be used to realize whether the overspeed protection functional programs is moved normally by import corresponding analog signal to single-chip microcomputer; and judge whether the hardware that relates to this function moves normally, thereby finish work for inspection automatically to the overspeed protection function of self.

As of the present utility model preferred, described velocity checking circuits also comprises data display circuit, overspeed protection execution indicator light, and described data display circuit, overspeed protection are carried out indicator light and all be connected with single-chip microcomputer.Data display circuit can show turbine speed in real time, and then is convenient to the staff and learns the detected turbine speed of this velocity checking circuits intuitively.Indicator light is carried out in overspeed protection can show intuitively that this velocity checking circuits has detected steam turbine and overspeed condition occurred.

As of the present utility model preferred, described velocity checking circuits also comprises external memory, and described external memory is connected with single-chip microcomputer.External memory is convenient to velocity checking circuits and is stored more multidata, realizes more refined control process; Also help storing the logging of longer time, so that call the historic state of thumbing steam turbine in the future.

The utility model adopts technique scheme: the tach signal of the steam turbine that TURBINE OVERSPEED PROTECTION DEVICE arrives from sensor by the analog signal generator simulation that carries, realized under the situation that does not rely on steam turbine particular job state, realizing self-checking function.Thereby overcome the self check condition height that starts steam turbine and cause, the shortcoming that cost is high, shortened greatly, improved self check efficient from the overhaul period.Because whether analog signal generator starts convenient, and just begin to check the overspeed protection function of TURBINE OVERSPEED PROTECTION DEVICE self normal after starting, therefore whole self check process has realized automation fully, and then has reduced labor intensity of operating personnel.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is further specified.

Fig. 1 is the electrical block diagram that the utlity model has the TURBINE OVERSPEED PROTECTION DEVICE of automatic self-checking function;

Fig. 2 is the structural representation of velocity checking circuits that the utlity model has the TURBINE OVERSPEED PROTECTION DEVICE of automatic self-checking function.

Embodiment

As shown in Figure 1, TURBINE OVERSPEED PROTECTION DEVICE has comprised that three groups of velocity checking circuits that work alone, three select two circuit and protection executive circuit.As shown in Figure 2; velocity checking circuits has comprised sensor signal adjustment circuit, has detected signal generating circuit, single-chip microcomputer, data display circuit, overspeed protection execution indicator light, input equipment and external memory certainly, wherein selects circuit to form from detecting signal generating circuit by pulse signal generation circuit and input signal.Sensor signal is adjusted circuit and is used to receive and handle the turbine speed information that arrives from sensor monitors, sensor signal is adjusted the output of circuit and is selected the input of circuit to be connected with input signal, and input signal selects the output of circuit to be connected with single-chip microcomputer; The input of pulse signal generation circuit is connected with single-chip microcomputer, and it can be in the analog quantity of output output simulation turbine speed after the control signal that receives single-chip microcomputer, and the output of pulse signal generation circuit is connected input signal and selects on the input of circuit.Input signal selects circuit to have arbitration functions, it can allow the signal priority from pulse signal generation circuit pass through, having sensor signal to adjust circuit and pulse signal generation circuit sends under the situation of signal simultaneously like this, input signal select circuit only can allow from the signal of pulse signal generation circuit by and pass to single-chip microcomputer.Data display circuit, overspeed protection execution indicator light, input equipment, external memory all are connected with single-chip microcomputer.Data display circuit can show the turbine speed that monitors in real time, and it shows that by utilization led charactron numerical value can reach intuitively, clearly express the advantage of speed conditions.Indicator light can show this defencive function intuitively when single-chip microcomputer is made overspeed protection implementation status is carried out in overspeed protection.Input equipment mainly is a keyboard, by keyboard can set overspeed protection limit value, start from detecting signal generating circuit and being pulse signal generation circuit setting analog quantity size.The single-chip microcomputer trip signal output of three groups of velocity checking circuits selects three inputs on two circuit to be connected with three respectively, and three select the output of two circuit to be connected with the input of protection executive circuit.

When whether check overspeed protection function is normally moved; only need to select to enable the option that detects signal generating circuit certainly by input equipment; the input analog amount size confirms that back Single-chip Controlling pulse signal generation circuit produces analog quantity, selects circuit to be passed to single-chip microcomputer by input signal again.If the analog quantity size less than the promptly default trip value of limit value then overspeed protection can not start, if the analog quantity size greater than limit value then overspeed protection start, overspeed protection is carried out indicator light and is lighted, single-chip microcomputer sends trip signal at the trip signal output.After trip signal selects the logic determines of two circuit through three, judge under the effective situation of this trip signal and carry out the tripping operation action by the protection executive circuit again.

Because the analog quantity that pulse signal generation circuit produces is the turbine speed that analog sensor signal is adjusted the electric circuit inspection gained; whether check overspeed protection function is normally just moved and is no longer relied on the steam turbine real work just can realize like this, greatly reduces test condition and inspection cost.And think ratio with checkout procedure original complete manual, big artificial amount, this checkout procedure automaticity height has been saved manpower and has been opened money.Analog signal can repeat to produce, and the checked operation that closes on like this can uninterruptedly be carried out, and the analogue signal generating time can ignore, so such checkout procedure round of visits is very short, has greatly improved operating efficiency.The automatic self-checking function that this TURBINE OVERSPEED PROTECTION DEVICE had because being better than the true signal that obtains that detects, analog signal adopted, so can also realize overspeed protection functional check work to TURBINE OVERSPEED PROTECTION DEVICE when the steam turbine operate as normal by single-chip microcomputer.

Claims

1. TURBINE OVERSPEED PROTECTION DEVICE; it comprises three groups of velocity checking circuits that work alone; three select two circuit; the protection executive circuit; the output of described velocity checking circuits all selects the input of two circuit to be connected with three; described three select the output of two circuit to be connected with the input of protection executive circuit; described velocity checking circuits comprises single-chip microcomputer at least; sensor signal is adjusted circuit and input equipment; the output that described sensor signal is adjusted circuit is connected with single-chip microcomputer; described input equipment is connected with single-chip microcomputer; it is characterized in that: described velocity checking circuits also comprises from detecting signal generating circuit; the described signal generating circuit that detects certainly comprises pulse signal generation circuit and input signal selection circuit; the input of described pulse signal generation circuit is connected with single-chip microcomputer; the output of described pulse signal generation circuit selects the input of circuit to be connected with input signal; described sensor signal is adjusted the output of circuit and is selected the input of circuit to be connected with input signal, and described input signal selects the output of circuit to be connected with single-chip microcomputer.

2. according to the described TURBINE OVERSPEED PROTECTION DEVICE of claim 1, it is characterized in that: described velocity checking circuits also comprises data display circuit, overspeed protection execution indicator light, and described data display circuit, overspeed protection are carried out indicator light and all be connected with single-chip microcomputer.

3. according to claim 1 or 2 described TURBINE OVERSPEED PROTECTION DEVICE, it is characterized in that: described velocity checking circuits also comprises external memory, and described external memory is connected with single-chip microcomputer.