CN101526423B - Intelligent check gauge of steam turbine monitor protection instrument and check method - Google Patents

Abstract

The invention provides an intelligent check gauge of a steam turbine monitor protection instrument and a check method. The check gauge comprises a computer, a signal generator and a data I/O module which are all connected in a two-way mode, wherein the output end of a steam turbine monitor protection instrument monitor is connected with the input end of the data I/O module, the output end of the signal generator is connected with the input end of a signal conditioner, and the output end of the signal conditioner is connected with the input end of the steam turbine monitor protection instrument monitor. The check method comprises the following steps: the type and the measuring range of the monitor required to be checked are directly input on a computer interface, and software automatically calculates signals supposed to be output according to the type, the installation way, the installation angle and the sensitivity of a sensor, then instructs the check gauge to output a designated signal, can check all alarm set points, record the analog output of the monitor and carry out error analysis. The invention reduces the professional knowledge threshold for engineering technical personnel engaged in maintenance and more effectively enables a user to directly carry out right check on the spot.

Description

A kind of steam turbine monitor protection instrument intelligent checking instrument and method of calibration

Technical field

The present invention relates to a kind of steam turbine monitor protection instrument intelligent checking instrument and check system, be used for the running status of Turbo-generator Set is carried out the verification of continuous on line monitor table, belong to steam turbine monitor protection instrument tester and method of calibration technical field.

Background technology

Steam turbine monitor protection instrument (being designated hereinafter simply as TSI) is carried out the conventional as described below of verification:

1) verification of the axial displacement and the difference that expands:

As shown in Figure 1, be axial displacement, the difference that expands monitor verification synoptic diagram.The verification principle is: the sensitivity of the sensor that is adopted according to axial displacement, the difference that expands monitor calculates the size of corresponding direct current signal, the needed D. C. value of manual adjustment also is input to monitor, the indicated value of record monitor and be connected to the record output valve of digital multimeter by the monitor lead-out terminal.Carry out error analysis according to the method for theory of errors to recorded, judge according to the relevant standard of country whether monitor is qualified.

Install with the plagiohedral installation and need calculate the size of corresponding direct current signal respectively for superimposed type installation, offset-type, come the output of manual adjustments direct current signal to carry out verification according to different installation principles.

2) verification of vibration relatively:

As shown in Figure 2, be relative vibration monitor verification synoptic diagram.The verification principle is: calculate the output gap voltage of sensor according to the mounting distance of the sensitivity of the sensor that relative vibration monitor adopted and sensor, the output voltage and the gap voltage of manual adjustment direct-flow signal generator adapt; Calculate the size of corresponding AC signal according to the sensitivity of the sensor that is adopted, the needed alternating voltage effective value of manual adjustment is input to monitor, the indicated value of record monitor and be connected to the record output valve of digital multimeter by the monitor lead-out terminal.Carry out error analysis according to the method for theory of errors to recorded, judge according to the relevant standard of country whether monitor is qualified.

3) verification of bear vibration:

As shown in Figure 3, be bear vibration monitor verification synoptic diagram.The verification principle is: the voltage of direct-flow signal generator is transferred to+12VDC, the sensitivity of the sensor that is adopted according to the bear vibration monitor calculates the size of corresponding AC signal, the needed alternating voltage effective value of manual adjustment is input to monitor, the indicated value of record monitor and be connected to the record output valve of digital multimeter by the monitor lead-out terminal.Carry out error analysis according to the method for theory of errors to recorded, judge according to the relevant standard of country whether monitor is qualified.

4) verification of rotating speed:

As shown in Figure 4, be speed monitor verification synoptic diagram.The verification principle is: the voltage of direct-flow signal generator is transferred to-12VDC, and the AC signal of adjusting AC signal generator is effective value 3VAC, according to the number of teeth that is installed in the prototype gear on the Steam Turbine and range, the frequency of manual adjustment AC signal generator, and the indicated value of record monitor and be connected to the record output valve of digital multimeter by the monitor lead-out terminal.Carry out error analysis according to the method for theory of errors to recorded, judge according to the relevant standard of country whether monitor is qualified.

5) verification of off-centre and key phase:

As shown in Figure 5, be off-centre and key phase monitor verification synoptic diagram.

The principle of eccentric verification is: the sensitivity of the survey eccentricity sensor that is adopted according to off-centre and key phase monitor and the mounting distance of this sensor calculate the output gap voltage of sensor, the output voltage and the gap voltage of manual adjustment direct-flow signal generator adapt, calculate the size of corresponding AC signal according to the sensitivity of the survey eccentricity sensor that is adopted, the needed alternating voltage effective value of manual adjustment is input to monitor, the indicated value of record monitor and be connected to the record output valve of digital multimeter by the monitor lead-out terminal.Carry out error analysis according to the method for theory of errors to recorded, judge according to the relevant standard of country whether monitor is qualified.

The principle of strong phase verification is: the voltage of direct-flow signal generator is transferred to-12VDC, and the AC signal of adjusting AC signal generator is effective value 3VAC, according to the number of teeth that is installed in the prototype gear on the Steam Turbine and range, the frequency of manual adjustment AC signal generator, and the indicated value of record monitor and be connected to the record output valve of digital multimeter by the monitor lead-out terminal.Carry out error analysis according to the method for theory of errors to recorded, judge according to the relevant standard of country whether monitor is qualified.

The verification of 6) cylinder expansion, servomotor stroke:

As shown in Figure 6, be cylinder expansion, servomotor stroke monitor verification synoptic diagram.The verification principle is: the range of the transducer LVDT that is adopted according to cylinder expansion, servomotor stroke calculates current value, the output current of manual adjustment constant current signal generator, be input to monitor, and the indicated value of record monitor and be connected to the record output valve of digital multimeter by the monitor lead-out terminal.Carry out error analysis according to the method for theory of errors to recorded, judge according to the relevant standard of country whether monitor is qualified.

According to above-mentioned narration to TSI instrument major parameter method of calibration, can be clear that: the measurement parameter related owing to the TSI instrument is numerous, and measuring principle is also different.For monitor, required input signal is also different, and direct current signal, AC signal, constant current signal are arranged, the positive supply that superposes in addition, negative supply, even use same type of sensor, sensitivity is also different.The difference of mounting means also needs mechanical quantity is converted into electric parameters, and record data are handled needs the user to be familiar with theory of errors, so require TSI instrument maintainer to need to be grasped deep professional knowledge when monitor is carried out verification.When verification, also have many points for attention,, and can directly have influence on the accuracy and the reliability of unit Monitoring Data thus if not really specialty increases the possibility of maloperation through regular meeting.The electric power research institute that therefore present general user entrusts to the verification of TSI instrument the each province finishes, and the dismounting transportation is inconvenient also to waste time, and influences project progress, and needs expensive expense.

Summary of the invention

The purpose of this invention is to provide a kind of steam turbine monitor protection instrument intelligent checking instrument and method of calibration, thereby reduce the related professional knowledge threshold of engineering technical personnel of being engaged in maintenance, more effectively allow the user directly can carry out verification correctly at the scene.

In order to achieve the above object; product technology scheme of the present invention has provided a kind of steam turbine monitor protection instrument intelligent checking instrument; comprise computer; computer is with signal generator and data I/O module is two-way is connected; the output terminal of steam turbine monitor protection instrument monitor connects the input end of data I/O module; it is characterized in that; the output terminal of signal generator and data I/O module connects the input end of signal conditioner, and the output terminal of signal conditioner connects by the steam turbine monitor protection instrument monitor of verification.

Method and technology scheme of the present invention has provided a kind of method of calibration, it is characterized in that, step is:

Step 1, the steam turbine monitor protection instrument monitor that selection need be carried out verification on computer interface enter monitor parameter after selecting to finish the interface are set;

Step 2, be provided with in monitor parameter monitor parameter is set in the interface, computer will have the signal that the automatic calculating of formula should be exported now according to mounting means, setting angle, the transducer sensitivity foundation of set parameter, sensor, send instructions then to signal generator, perhaps send command signal to signal generator and data I/O module simultaneously, make the signal of tester output appointment;

Step 3, signal generator and data I/O module provide corresponding signal according to the checking signal that receives to signal conditioner, convert thereof into the signal that can be accepted by the steam turbine monitor protection instrument monitor by signal conditioner after, send to monitor;

After step 4, data I/O module collect signal from the steam turbine monitor protection instrument monitor, send the analog quantity output of computer record monitor to and carry out error analysis, judge that promptly the analog quantity receive is whether in the allowed band of relative national standards, if in this scope, then data presentation is a black, otherwise shown in red;

Step 5, generation test report.

A kind of method of calibration provided by the invention come down to move with a kind of steam turbine monitor protection instrument intelligent checking instrument provided by the invention on system software; after both combine; form the automatic checkout system of a TSI instrument, generate the verification report automatically, and carry out error analysis.

Advantage of the present invention is: reduce the related professional knowledge threshold of engineering technical personnel of being engaged in maintenance, more effectively allow the user directly can carry out verification correctly at the scene.

Description of drawings

Fig. 1 is axial displacement, the difference that expands monitor verification synoptic diagram;

Fig. 2 is relative vibration monitor verification synoptic diagram;

Fig. 3 is a bear vibration monitor verification synoptic diagram;

Fig. 4 is a speed monitor verification synoptic diagram;

Fig. 5 is off-centre and key phase monitor verification synoptic diagram;

Fig. 6 is cylinder expansion, servomotor stroke monitor verification synoptic diagram;

Fig. 7 is a kind of steam turbine monitor protection instrument intelligent checking instrument structural representation provided by the invention;

Fig. 8 is the signal conditioner structural representation;

Fig. 9 is the circuit diagram of a DC-DC change-over circuit;

Figure 10 is the circuit diagram of the 2nd DC-DC change-over circuit;

Figure 11 is the circuit diagram of the 3rd DC-DC change-over circuit;

Figure 12 is the circuit diagram of V/I change-over circuit;

Figure 13 is the circuit diagram of TTL pulse wave signal change-over circuit;

Figure 14 is the circuit diagram of I/V change-over circuit;

Figure 15 is the method for calibration process flow diagram;

Figure 16 is the means of communication process flow diagram of computer and signal generator;

Figure 17 is that computer sends the data communication method flow diagram to data I/O module;

Figure 18 is that data I/O module sends the data communication method flow diagram to computer.

Embodiment

Specify the present invention below in conjunction with embodiment.

As shown in Figure 7; be a kind of steam turbine monitor protection instrument intelligent checking instrument structural representation provided by the invention; comprise computer; signal generator and data I/two-way connection of O module; the output terminal of steam turbine monitor protection instrument monitor connects the input end of data I/O module; the output terminal of signal generator and data I/O module connects the input end of signal conditioner, and the output terminal of signal conditioner connects by the input end of the steam turbine monitor protection instrument monitor of verification.

In the present embodiment, computer is selected notebook for use, the 33220A signal generator that signal generator selects for use Agilent company to produce, the USB6009 data acquisition card that data I/O module selects for use NI company to produce.Connect by the USB mouth between these three parts.

As shown in Figure 8, be the signal conditioner structural representation, form by six separate modules.These six modules are respectively: a DC-DC change-over circuit, the 2nd DC-DC change-over circuit, the 3rd DC-DC change-over circuit, V/I change-over circuit, TTL pulse wave signal change-over circuit and I/V change-over circuit.

The effect of the one DC-DC change-over circuit be the 0～5VDC DC voltage with USB6009 data acquisition card input convert 0 to～-20VDC; The effect of the 2nd DC-DC change-over circuit be the 0～5VDC DC voltage with USB6009 data acquisition card input convert 0 to～-20VDC and superimposed with the AC signal of 33220A signal generator output; The 3rd DC-DC change-over circuit is to convert 0～5VDC DC voltage that the USB6009 data acquisition card is imported to 0～20VDC and superimposed with the AC signal of 33220A signal generator output; The DC voltage of USB6009 data acquisition card input is converted to the V/I change-over circuit of 4～20mADC; The effect of TTL pulse wave signal change-over circuit be the TTL conversion of signals with 33220A signal generator output become high level be-the 10V low level is-20V pulsating wave; Because the USB6009 data acquisition card can only be gathered the magnitude of voltage of 1～5VDC, so the effect of I/V change-over circuit is that current signal with 4～20mA of monitor output converts 1～5VDC to.

As shown in Figure 9, it is the circuit diagram of a DC-DC change-over circuit, comprise first voltage follower circuit, the input end of first voltage follower circuit connects the output terminal of USB6009 data acquisition card, the inverting input of first see-saw circuit connects the output terminal of first voltage follower circuit, first zeroing circuit, the in-phase input end ground connection of first see-saw circuit, the output terminal of first see-saw circuit connects the input end of second voltage follower circuit.

Operational amplifier A 1 and operational amplifier A 3 are respectively as first voltage follower and second voltage follower, in order to change circuit input impedance and output impedance.Operational amplifier A 2 is as first inverting amplifier.For 0～5VDC is converted to 0～-20VDC, the gain of operational amplifier A 2 should be 4, so resistance R 2, resistance R 5 are got 7.5K, 30K respectively.The output maximal value of operational amplifier A 2 is-20V so adopt the asymmetrical power supply power supply at this, might produce bigger offset voltage like this.Therefore, resistance R 6, resistance R 7, variable resistor Rw1 ,+15V supply voltage VCC1 and-15V supply voltage VEE1 forms first zeroing circuit, is used for adjusting the output offset voltage of operational amplifier A 2.The imbalance setting range is:

$u_{\mathrm{io}}=\±15\frac{R5//R2}{R4}=\±15\mathrm{mV};$

R3=R2//R5=6K Ω, getting nominal value here is 6.2K.Relation between this circuit input and the output is as follows:

$u_o=-\frac{R5}{R2}{u}_i=-4u_i;$

In order to determine the precision of each resistance among Fig. 9, according to the transfer theory of average error and relative error, be provided with a physical quantity N, by variable u1, u2 ... the .un decision:

N＝f(u1，u2，…，un)

U1, u2 ..., the un error is Δ u1, Δ u2 ..., Δ un has so:

$\mathrm{dN}={\left(\frac{\&PartialD;f}{{\&PartialD;u}_1}\right)}_{u1\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">u</figure-callout>}2....u_{\mathrm{<figure-callout\; id="1"\; label="n\; d\; u"\; filenames="H2008102075581E00052.png,H2008102075581E00061.png"\; state="\{\{state\}\}">n</figure-callout>}}}d{u}_{}{}_1+{\left(\frac{\&PartialD;f}{\&PartialD;u_2}\right)}_{u1\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">u</figure-callout>}2....\mathrm{<figure-callout\; id="2"\; label="un\; d\; u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">un</figure-callout>}}d{u}_{}{}_2+....{\left(\frac{\&PartialD;f}{{\&PartialD;u}_n}\right)}_{u1\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">u</figure-callout>}2....\mathrm{un}}{\mathrm{du}}_n$

Replace dui with variable error Δ ui separately, and consider that under the worst situation, error can not be offset, thereby cause the accumulation of error, so take absolute value.Following formula becomes:

$\mathrm{\&Delta;N}=\left|\frac{\&PartialD;f}{{\&PartialD;\mathrm{<figure-callout\; id="1"\; label="u"\; filenames="H2008102075581E00052.png,H2008102075581E00061.png"\; state="\{\{state\}\}">u</figure-callout>}}_1}\right|\left|\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="1"\; label="u"\; filenames="H2008102075581E00052.png,H2008102075581E00061.png"\; state="\{\{state\}\}">u</figure-callout>}}_1\right|+\left|\frac{\&PartialD;f}{\&PartialD;{\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">u</figure-callout>}}_2}\right|\left|\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">u</figure-callout>}}_2\right|+....\left|\frac{\&PartialD;f}{{\&PartialD;u}_n}\right|\left|\mathrm{\&Delta;}{u}_n\right|;$

With N=f (u1, u2 ..., un) be divided by, get relative error:

$\frac{\mathrm{\&Delta;N}}{N}=\frac{1}{f}\left[\right|\frac{\&PartialD;f}{{\&PartialD;\mathrm{<figure-callout\; id="1"\; label="u"\; filenames="H2008102075581E00052.png,H2008102075581E00061.png"\; state="\{\{state\}\}">u</figure-callout>}}_1}\left|\right|\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="1"\; label="u"\; filenames="H2008102075581E00052.png,H2008102075581E00061.png"\; state="\{\{state\}\}">u</figure-callout>}}_1|+|\frac{\&PartialD;f}{{\&PartialD;\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">u</figure-callout>}}_2}\left|\right|\mathrm{\&Delta;}{\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">u</figure-callout>}}_2|+....|\frac{\&PartialD;f}{{\&PartialD;u}_n}\left|\right|\mathrm{\&Delta;}{u}_n\left|\right]$

Utilization following formula direct measured value open to discussion and result's different functional relations, and carry out the calculating of error transfer.

When funtcional relationship is multiplication and division method: N=u1*u2 or N=u1/u2

$\frac{\mathrm{\&Delta;N}}{N}=\left|\frac{{\mathrm{\&Delta;u}}_1}{{\mathrm{<figure-callout\; id="1"\; label="u"\; filenames="H2008102075581E00052.png,H2008102075581E00061.png"\; state="\{\{state\}\}">u</figure-callout>}}_1}\right|+\left|\frac{\mathrm{\&Delta;}{u}_2}{{\mathrm{<figure-callout\; id="2"\; label="u"\; filenames="H2008102075581E00051.png,H2008102075581E00052.png"\; state="\{\{state\}\}">u</figure-callout>}}_2}\right|;$

Because output accuracy is less than 1%, so require:

$\left|\frac{\mathrm{\&Delta;}{R}_5}{R_5}\right|+\left|\frac{\mathrm{\&Delta;}{R}_4}{R_4}\right|<1\%;$

Selecting resistance R 5, resistance R 4 at this is respectively that precision is 0.1% precision resistance.Resistance precision system of selection in the following circuit is identical therewith, is 0.5% with the related resistance precision of output voltage, and all the other all resistance are the metalfilmresistor of precision 1%.

As shown in figure 10, it is the circuit diagram of the 2nd DC-DC change-over circuit, comprise first voltage follower circuit and tertiary voltage follow circuit, the input end of first voltage follower circuit connects the output terminal of USB6009 data acquisition card, the input end of tertiary voltage follow circuit connects the output terminal of 33220A signal generator, the inverting input of first see-saw circuit connects first voltage follower circuit, the output terminal of the tertiary voltage follow circuit and first zeroing circuit, the in-phase input end ground connection of first see-saw circuit, the output terminal of first see-saw circuit connects the input end of second voltage follower circuit.

Part is identical with circuit shown in Figure 9 in the circuit shown in Figure 10, and identical part does not have design iterations in the side circuit design,, for simple and clear identical circuit is also drawn at this.Difference is exactly that inverting input in operational amplifier A 2 has superposeed from the AC signal of 33220A signal generator output, and this AC signal is by operational amplifier A 4 inputs as the tertiary voltage follower.The output and the relation between the input circuit of this circuit diagram are as follows:

$u_o=-(\frac{R5}{R2}{u}_{\mathrm{DC}}+\frac{R5}{R8}{u}_{\mathrm{AC}})=-(4u_{\mathrm{DC}}+u_{\mathrm{AC}}).$

As shown in figure 11, it is the circuit diagram of the 3rd DC-DC change-over circuit, comprise first voltage follower circuit and tertiary voltage follow circuit, the input end of first voltage follower circuit connects the output terminal of data I/O module, the input end of tertiary voltage follow circuit connects the output terminal of 33220A signal generator, the inverting input of first see-saw circuit connects the output terminal of first voltage follower circuit and first zeroing circuit, the in-phase input end ground connection of first see-saw circuit, the output terminal of first see-saw circuit connects the inverting input of second see-saw circuit, the inverting input of second see-saw circuit connects the output terminal of second zeroing circuit and tertiary voltage follow circuit, second see-saw circuit in-phase input end ground connection, the output terminal of second see-saw circuit connects the input end of second voltage follower circuit.

Part is identical with circuit shown in Figure 9 in the circuit shown in Figure 11, and identical part does not have design iterations in the side circuit design,, for simple and clear identical circuit is also drawn at this.Difference is exactly that output terminal in operational amplifier A 2 has added operational amplifier A 5 as the second anti-phase adder calculator, and it is superimposed with the AC signal of the output of A2 and the output of 33220A signal generator.The output maximal value of A5 is 20V, so adopt the asymmetrical power supply power supply at this, might produce bigger offset voltage like this, therefore, the supply voltage of resistance R 13, resistance R 14, variable resistor Rw2,15V and-supply voltage of 15V forms second zeroing circuit, is used for adjusting the output offset voltage of A5.Imbalance rectification scope is:

$u_{\mathrm{io}}=\&PlusMinus;15\frac{\mathrm{<figure-callout\; id="10"\; label="R"\; filenames="H2008102075581E00051.png,H2008102075581E00061.png"\; state="\{\{state\}\}">R</figure-callout>}10//R11}{\mathrm{<figure-callout\; id="15"\; label="R"\; filenames="H2008102075581E00061.png"\; state="\{\{state\}\}">R</figure-callout>}15}=\&PlusMinus;15\mathrm{mV};$

Relation between the output of this circuit diagram and the input is as follows:

$u_o=\frac{R5}{R2}\frac{R11}{R10}{u}_{\mathrm{DC}}+\frac{R11}{R8}{u}_{\mathrm{AC}}=4u_{\mathrm{DC}}+u_{\mathrm{AC}}.$

As shown in figure 12, circuit diagram for the V/I change-over circuit, comprise the 3rd see-saw circuit, the inverting input of the 3rd see-saw circuit connects the input end of data I/O module, the in-phase input end ground connection of the 3rd see-saw circuit, the output terminal of the 3rd see-saw circuit connects the inverting input of the 4th anti-phase adding circuit, the inverting input of the 4th anti-phase adding circuit connects the 3rd mu balanced circuit, the in-phase input end ground connection of the 4th anti-phase adding circuit, the output terminal of the 4th see-saw circuit connects the inverting input of the 5th see-saw circuit, the output terminal of the 5th see-saw circuit connects the in-phase input end of the 4th follower, the 4th follower output terminal and inverting input between be connected.

Operational amplifier A 5 is as the 3rd inverting amplifier of gain 2, and operational amplifier A 6 is as the 4th anti-phase totalizer, and operational amplifier A 7 is 1 the 5th inverting amplifier as gain, and operational amplifier A 8 is as anti-adverse current operational amplifier.Resistance R 24, variable resistor Rw4, voltage stabilizing diode D1 constitute first mu balanced circuit.The series of the optional burning voltage of stabilivolt between between 2～4V is selected the 1N4728A of Motorola Inc. here, its burning voltage 3.3V, and working current is about 76mA.Operational amplifier A 6 is introduced voltage as anti-phase totalizer, obtains by the burning voltage of adjusting variable resistor Rw4 dividing potential drop stabilivolt D1.Here I _Rw2=3.3V/5K=0.66mA,

(15V-u is then arranged _z)/R24=Iz+I _Rw4So,

$R24=\frac{15V-u_z}{I_z+I_{\mathrm{Rw}4}}=\frac{15-3.3}{76+0.66}=0.1526\mathrm{K\&Omega;};$ Get nominal value R24=154 Ω.

The input and the output relation of this circuit are as follows:

$\mathrm{Io}=\frac{1}{R26}(-\frac{R17+R18}{R16}\frac{R21}{R20}\frac{R22}{R23}{u}_{\mathrm{DC}}-\frac{R21}{R19}\frac{R22}{R23}{u}_z)=-3.2u_{\mathrm{DC}}-4$

As shown in figure 13, circuit diagram for TTL pulse wave signal change-over circuit, comprise the 6th see-saw circuit, the inverting input of the 6th see-saw circuit connects the output terminal of signal generator, the 3rd zeroing circuit and second mu balanced circuit, the in-phase input end ground connection of the 6th see-saw circuit.

Operational amplifier A 9 is as the 6th anti-phase totalizer, and resistance R 33, variable resistor Rw5, voltage stabilizing diode D3 constitute second mu balanced circuit.The series of the optional burning voltage of stabilivolt between between 8～12V is selected the 1N4740A of Motorola Inc. here, burning voltage 10V, and working current is about 25mA.It is 10V that operational amplifier A 9 is introduced voltage, obtains through electric resistance partial pressure by stabilivolt.Here I _Rw5=10V/5K=2mA,

(15V-uz)/R33=Iz+IRW5 is then arranged, so

$R33=\frac{15V-u_z}{I_z+I_{\mathrm{Rw}5}}=\frac{15-10}{25+2.0}=0.185\mathrm{K\&Omega;};$

Get nominal value R33=187 Ω.

The input and the output relation of this circuit are as follows:

$u_o=-(\frac{R30}{R29}{u}_{\mathrm{TTL}}+\frac{R30}{R31}{u}_z)=-(u_{\mathrm{TTL}}+10).$

As shown in figure 14; circuit diagram for the I/V change-over circuit; comprise the 7th see-saw circuit; the inverting input of the 7th see-saw circuit connects the record output terminal of steam turbine monitor protection instrument monitor; the in-phase input end ground connection of the 7th see-saw circuit; the output of the 7th see-saw circuit connects the inverting input of the 8th see-saw circuit, the in-phase input end ground connection of the 8th see-saw circuit, and the output of the 8th see-saw circuit connects the input end of USB6009 data acquisition card.

Operational amplifier A 10 is 1 the 7th inverting amplifier as gain, adopts differential input, and its changing voltage is used resistance R37 two termination electric current loop two ends, and resistance is 250 Ω.Input current 4mA corresponding voltage 1V like this, input current 20mA corresponding voltage 5V.A10 gain is 1, corresponding output voltage is-1～-5V.So require resistance R 38, R40 and R39+Rw6 resistance to equate.Here select R38=R40=10k Ω; Select R39=9.1K Ω, Rw6=2K Ω.Rw6 is used to adjust because the asymmetric error that causes of resistive element, make the output voltage correspondence should be-1 in output～-5V, operational amplifier A 11 is 1 the 8th inverting amplifier as gain, the power taking resistance is: R41=R42=R43=10k Ω.

Be the method for calibration FB(flow block) as shown in figure 15, its step is as follows:

Step 1, the steam turbine monitor protection instrument monitor that selection need be carried out verification on computer interface enter monitor parameter after selecting to finish the interface are set;

Step 2, be provided with in monitor parameter monitor parameter is set in the interface, computer will have the signal that the automatic calculating of formula should be exported now according to mounting means, setting angle, the transducer sensitivity foundation of set parameter sensors, send instructions then to signal generator, perhaps, make the signal of tester output appointment simultaneously to signal generator and the data I/O module signal that sends instructions;

Step 3, signal generator and data I/O module provides corresponding signal according to the command signal that receives to signal conditioner, convert thereof into and to be sent to monitor by behind the receptible signal of steam turbine monitor protection instrument monitor by signal conditioner;

After step 4, data I/O module collect signal from the steam turbine monitor protection instrument monitor, send the analog quantity output of computer record monitor to and carry out error analysis, judge that promptly the analog quantity receive is whether in the allowed band of relative national standards, if in this scope, then data presentation is a black, otherwise shown in red;

Step 5, generation test report.

As shown in figure 16, the means of communication process flow diagram for computer and signal generator the steps include:

Being connected between step 2.1, foundation and the signal generator;

Step 2.2, if the mistake that connects then withdraws from, otherwise continue;

Step 2.3, the USB interface address is set;

Step 2.4, send the SCPI instruction, output signal frequency, amplitude, DC biasing, output unit and output impedance parameter are set to signal generator; Wherein send different SCPI instructions and just obtain sinusoidal wave effective value output module, sinusoidal wave peak-to-peak value output module, synchronizing signal output module or reseting module to signal generator;

Sinusoidal wave effective value output module obtains through the following steps:

Step 2.4.1, output signal is set for sinusoidal wave;

Step 2.4.2, appointment sinewave output value are effective value;

Step 2.4.3, according to monitor parameter described in the step 2 monitor parameter that is provided with in the interface is set and specifies output frequency, DC biasing and output impedance.

Sinusoidal wave peak-to-peak value output module obtains through the following steps:

Step 2.4.1, output signal is set for sinusoidal wave;

Step 2.4.2, appointment sinewave output value are peak-to-peak value;

Step 2.4.3, according to monitor parameter described in the step 2 monitor parameter that is provided with in the interface is set and specifies output frequency, DC biasing and output impedance.

The synchronizing signal output module is provided with the output of On/Off synchronizing signal by the SCPI instruction and obtains.

Reseting module is a SCPI instruction reseting signal generator.

Step 2.5, the signal that sets by step 2.4 to signal conditioner output by signal generator;

Step 2.6, withdraw from, wait for operation next time.

As shown in figure 17, for computer sends the data communication method flow diagram to data I/O module, the steps include:

Step 2.1, establishment data I/O task;

Step 2.2, if task creation is made mistakes, then withdraw from, otherwise continue;

Step 2.3, appointment output channel; Data I/O module has two output channels, i.e. passage 0, passage 1, different lead-out terminal on corresponding and the data I/O module.Come dedicated tunnel according to the selected interface that is provided with by verification steam turbine monitor protection instrument monitor.

Step 2.4, according to monitor parameter the monitored parameter that is provided with in the interface is set and specifies voltage to signal conditioner output;

Step 2.5, withdraw from task, wait for operation next time.

As shown in figure 18, for data I/O module sends the data communication method flow diagram to computer, the steps include:

Step 3.1, establishment data I/O task;

Step 3.2, if task creation is made mistakes, then withdraw from, otherwise continue;

Step 3.3, appointment input channel; Data I/O module has eight input channels, passage 0～7, and different input terminal on corresponding and the I/O module is specified input channel according to the selected interface that is provided with by verification steam turbine monitor protection instrument monitor.

Step 3.4, because the output signal of I/V change-over circuit is connected to the signal input terminal of data I/O module, therefore acquisition mode being set is single-phase input mode;

Step 3.5, read collection numerical value;

Step 3.6, withdraw from task, wait for operation next time.

Claims (17)

1. steam turbine monitor protection instrument intelligent checking instrument; it is characterized in that; comprise computer; signal generator is connected with data I/O module is two-way; the output terminal of steam turbine monitor protection instrument monitor connects the input end of data I/O module; the output terminal of signal generator and data I/O module connects the input end of signal conditioner; the output terminal of signal conditioner connects by the input terminal of the steam turbine monitor protection instrument monitor of verification; described signal conditioner by the DC voltage with the input of data I/O module convert 0 to～-the DC-DC change-over circuit of 20VDC; convert the DC voltage of data I/O module input to 0～-20VDC and with the 2nd superimposed DC-DC change-over circuit of AC signal of signal generator output; the 3rd superimposed DC-DC change-over circuit of AC signal that the DC voltage that data I/O module is imported converts 0～20VDC to and exports with signal generator; convert the DC voltage of data I/O module input the V/I change-over circuit of 4～20mADC to; become high level to be-10V the TTL conversion of signals of signal generator output; low level is formed for the TTL pulse wave signal change-over circuit of-20V pulsating wave and with the I/V change-over circuit that the current signal of 4～20mA of steam turbine monitor protection instrument monitor output converts the voltage signal in data I/O module tolerance interval to, and is separate between each change-over circuit.

2. a kind of steam turbine monitor protection instrument intelligent checking instrument as claimed in claim 1; it is characterized in that; a described DC-DC change-over circuit comprises first voltage follower circuit; the input end of first voltage follower circuit connects the output terminal of data I/O module; the inverting input of first see-saw circuit connects the output terminal of first voltage follower circuit, first zeroing circuit; the in-phase input end ground connection of first see-saw circuit, the output terminal of first see-saw circuit connects the input end of second voltage follower circuit.

3. a kind of steam turbine monitor protection instrument intelligent checking instrument as claimed in claim 1; it is characterized in that; described the 2nd DC-DC change-over circuit comprises first voltage follower circuit and tertiary voltage follow circuit; the input end of first voltage follower circuit connects the output terminal of data I/O module; the input end of tertiary voltage follow circuit connects the output terminal of signal generator; the inverting input of first see-saw circuit connects first voltage follower circuit; the output terminal of the tertiary voltage follow circuit and first zeroing circuit; the in-phase input end ground connection of first see-saw circuit, the output terminal of first see-saw circuit connects the input end of second voltage follower circuit.

4. a kind of steam turbine monitor protection instrument intelligent checking instrument as claimed in claim 1; it is characterized in that; described the 3rd DC-DC change-over circuit comprises first voltage follower circuit and tertiary voltage follow circuit; the input end of first voltage follower circuit connects the output terminal of data I/O module; the input end of tertiary voltage follow circuit connects the output terminal of signal generator; the inverting input of first see-saw circuit connects the output terminal of first voltage follower circuit and first zeroing circuit; the in-phase input end ground connection of first see-saw circuit; the output terminal of first see-saw circuit connects the inverting input of second see-saw circuit; the inverting input of second see-saw circuit connects the output terminal of second zeroing circuit and tertiary voltage follow circuit; second see-saw circuit in-phase input end ground connection, the output terminal of second see-saw circuit connects the input end of second voltage follower circuit.

5. a kind of steam turbine monitor protection instrument intelligent checking instrument as claimed in claim 1; it is characterized in that; described V/I change-over circuit comprises the 3rd see-saw circuit; the inverting input of the 3rd see-saw circuit connects the output terminal of data I/O module; the in-phase input end ground connection of the 3rd see-saw circuit; the output terminal of the 3rd see-saw circuit connects the inverting input of the 4th anti-phase adding circuit; the inverting input of the 4th anti-phase adding circuit connects the 3rd mu balanced circuit; the in-phase input end ground connection of the 4th anti-phase adding circuit; the output terminal of the 4th see-saw circuit connects the inverting input of the 5th see-saw circuit; the output terminal of the 5th see-saw circuit connects the in-phase input end of the 4th follower, the 4th follower output terminal and inverting input between be connected.

6. a kind of steam turbine monitor protection instrument intelligent checking instrument as claimed in claim 1; it is characterized in that; described TTL pulse wave signal change-over circuit comprises the 6th see-saw circuit; the inverting input of the 6th see-saw circuit connects the output terminal of signal generator, the 3rd zeroing circuit and second mu balanced circuit, the in-phase input end ground connection of the 6th see-saw circuit.

7. a kind of steam turbine monitor protection instrument intelligent checking instrument as claimed in claim 1; it is characterized in that; described I/V change-over circuit comprises the 7th see-saw circuit; the inverting input of the 7th see-saw circuit connects the record output terminal of steam turbine monitor protection instrument monitor; the in-phase input end ground connection of the 7th see-saw circuit; the output of the 7th see-saw circuit connects the inverting input of the 8th see-saw circuit; the in-phase input end ground connection of the 8th see-saw circuit, the output of the 8th see-saw circuit connects the input end of data I/O module.

8. as each described a kind of steam turbine monitor protection instrument intelligent checking instrument in the claim 1 to 7, it is characterized in that computer is connected by USB interface with signal generator and data I/O module.

9. an application is characterized in that as the method for calibration of steam turbine monitor protection instrument intelligent checking instrument as described in the claim 8 step is:

Step 1, the steam turbine monitor protection instrument monitor that selection need be carried out verification on computer interface enter monitor parameter after selecting to finish the interface are set;

Step 2, be provided with in monitor parameter monitor parameter is set in the interface, computer will have the signal that the automatic calculating of formula should be exported now according to mounting means, setting angle, the transducer sensitivity foundation of set parameter, sensor, the signal that sends instructions is then given signal generator, perhaps send command signal to signal generator and data I/O module simultaneously, make the signal of steam turbine monitor protection instrument intelligent checking instrument output appointment;

Step 3, signal generator or signal generator and data I/O module provides corresponding signal according to the command signal that receives to signal conditioner, after converting thereof into the signal that to be accepted by the steam turbine monitor protection instrument monitor by signal conditioner, send to the steam turbine monitor protection instrument monitor;

Step 4, data I/O module send computer to after the steam turbine monitor protection instrument monitor collects signal, the analog quantity output of record steam turbine monitor protection instrument monitor is also carried out error analysis, judge that promptly the analog quantity receive is whether in the allowed band of relative national standards, if in this scope, then data presentation is a black, otherwise shown in red;

Step 5, generation test report.

10. a kind of method of calibration as claimed in claim 9 is characterized in that, the means of communication of computer and signal generator are in the step 2:

Being connected between step 2.1, foundation and the signal generator;

Step 2.2, if the mistake that connects then withdraws from, otherwise continue;

Step 2.3, the USB interface address is set;

Step 2.4, send the SCPI instruction, output signal frequency, amplitude, DC biasing, output unit and output impedance are set to signal generator; Wherein send different SCPI instructions and just obtain sinusoidal wave effective value output module, sinusoidal wave peak-to-peak value output module, synchronizing signal output module or reseting module to signal generator;

Step 2.5, the signal that sets by step 2.4 to signal conditioner output by signal generator;

Step 2.6, withdraw from, wait for operation next time.

11. a kind of method of calibration as claimed in claim 10 is characterized in that, described sinusoidal wave effective value output module obtains through the following steps:

Step 2.4.1, output signal is set for sinusoidal wave;

Step 2.4.2, appointment sinewave output value are effective value;

Step 2.4.3, according to monitor parameter described in the step 2 monitor parameter that is provided with in the interface is set and specifies output frequency, DC biasing and output impedance.

12. a kind of method of calibration as claimed in claim 10 is characterized in that, described sinusoidal wave peak-to-peak value output module obtains through the following steps:

Step 2.4.1, output signal is set for sinusoidal wave;

Step 2.4.2, appointment sinewave output value are peak-to-peak value;

Step 2.4.3, according to monitor parameter described in the step 2 monitor parameter that is provided with in the interface is set and specifies output frequency, DC biasing and output impedance.

13. a kind of method of calibration as claimed in claim 10 is characterized in that, described synchronizing signal output module is provided with the output of On/Off synchronizing signal by the SCPI instruction and obtains.

14. a kind of method of calibration as claimed in claim 10 is characterized in that, described reseting module is a SCPI instruction reseting signal generator.

15. a kind of method of calibration as claimed in claim 9 is characterized in that, computer to the means of communication that data I/O module sends instruction is in the step 2:

Step 2.1, establishment data I/O task;

Step 2.2, if task creation is made mistakes, then withdraw from, otherwise continue;

Step 2.3, come specific data I/O module output channel according to the selected interface that is provided with by verification steam turbine monitor protection instrument monitor;

Step 2.4, according to monitor parameter the monitored parameter that is provided with in the interface is set and specifies voltage to signal conditioner output;

Step 2.5, withdraw from task, wait for operation next time.

16. a kind of method of calibration as claimed in claim is characterized in that, data I in the step 4/O module sends the data communication method to computer and is:

Step 4.1, establishment data I/O task;

Step 4.2, if task creation is made mistakes, then withdraw from, otherwise continue;

Step 4.3, according to selected by the input channel that specific data I/O module is come at the interface that is provided with of verification steam turbine monitor protection instrument monitor;

Step 4.4, acquisition mode is set;

Step 4.5, read collection numerical value;

Step 4.6, withdraw from task, wait for operation next time.

17. a kind of method of calibration as claimed in claim 16 is characterized in that, the acquisition mode described in the step 3.4 is single-phase input mode, and its method to set up is: the signal input terminal that the output signal of I/V change-over circuit is connected to data I/O module.

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