CN109444625A - Reliability steam turbine pitch driving device and method with secondary readback monitoring circuit - Google Patents
Reliability steam turbine pitch driving device and method with secondary readback monitoring circuit Download PDFInfo
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- CN109444625A CN109444625A CN201811249846.3A CN201811249846A CN109444625A CN 109444625 A CN109444625 A CN 109444625A CN 201811249846 A CN201811249846 A CN 201811249846A CN 109444625 A CN109444625 A CN 109444625A
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- circuit
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- readback
- current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of reliability steam turbine pitch driving devices of the secondary readback monitoring circuit of band, including source driving signal, internal signal conditioning circuit and voltage-to-current conversion circuit, source driving signal, internal signal conditioning circuit and voltage-to-current conversion circuit are successively linked in sequence, and are provided with first amplitude read back circuit and polarity read back circuit between internal signal conditioning circuit and source driving signal；The second amplitude read back circuit is provided between voltage-to-current conversion circuit and source driving signal；The application is primary, secondary readback measurement monitoring circuit shares same polarity observation circuit to differentiate the polar correctness of output drive signal.The abnormal read back waveform monitored can carry out alarm operation at the first time.
Description
Technical field
The present invention relates to technical field of industrial control, and in particular to a kind of reliability steamer of the secondary readback monitoring circuit of band
The realization of machine pitch driving device.
Background technique
Steam turbine is also referred to as steam turbine engine, is a kind of rotary steam power device, and high temperature and high pressure steam passes through solid
Nozzle is determined as being ejected on blade after the air-flow accelerated, makes the rotor rotation equipped with blade row, while external work done.Steam turbine
It is the capital equipment of modern thermal power plant, is also used for metallurgical industry, chemical industry, in ship's powerplant.Steam turbine goes out
The development of power industry is now greatly pushed.
Steam turbine is the external combustion rotary machinery that can convert steam thermal energy to mechanical work.Steam from boiler enters vapour
After turbine, successively the nozzle and movable vane Jing Guo a series of loop configurations, convert turbine rotor rotation for the thermal energy of steam
Mechanical energy.Steam carries out energy conversion in different ways, just constitutes the steam turbine of different operating principle in steam turbine.
Safety, the Eco-power requirement of unit are also got in the increase of thermoelectric generator pool-size, the raising of steam parameter
Come higher.In Large-scale machine set, digital electro-hydraulic control system (DEH) is widely used.Steam Turhine Adjustment porthole conduct
The main executing agency of DEH system, the quantity of steam into steam turbine is increased or decreased by the increase and reduction of its aperture, from
And the revolving speed and power of unit are controlled, failure will lead to generating unit speed or power swing, even adjust machine, directly threaten machine
The safe and economic operation of group.
Steam turbine pitch driving device exports bipolar drive electric current and gives steam turbine pitch servo valve, the driving of positive polarity electric current
Steam turbine pitch carries out out operation, negative polarity electric current driving steam turbine pitch carries out pass operation, the size of electric current influences pitch and opens
The speed of pass.Traditional steam turbine pitch driving device, often can not be real-time while output driving current to steam turbine pitch
The loop works correctness of monitoring driving output loop, or simple circuit monitoring function is only provided, to internal circuit abnormality and
Situations such as external circuit is broken can not often be monitored at the first time and provide warning message to operator.
Summary of the invention
It is an object of the invention to overcome deficiency in the prior art, provide a kind of secondary readback monitoring circuit of band can
By property steam turbine pitch driving device, the technical issues of solution.
Technical solution of the present invention is as follows:
A kind of reliability steam turbine pitch driving device of the secondary readback monitoring circuit of band, including source driving signal, inside
Signal condition circuit and voltage-to-current conversion circuit, source driving signal, internal signal conditioning circuit and voltage to electric current are converted
Circuit is successively linked in sequence, and is provided with first amplitude read back circuit and polarity between internal signal conditioning circuit and source driving signal
Read back circuit；The second amplitude read back circuit is provided between voltage-to-current conversion circuit and source driving signal.
Internal signal conditioning circuit includes that the first amplifier and first follows circuit；
First amplitude read back circuit follows circuit and the second rectification circuit including the second amplifier, second；
Second amplitude read back circuit includes that third amplifier, third follow circuit, third rectification circuit and sampling resistor；
Polarity read back circuit follows circuit and isolation circuit including the 4th；
Source driving signal, the first amplifier, first follow circuit and voltage-to-current conversion circuit to be successively linked in sequence；
Voltage-to-current conversion circuit, the second amplifier, second follow circuit, the second rectification circuit and source driving signal according to
Secondary sequential connection；
Voltage-to-current conversion circuit, sampling resistor, third amplifier, third follow circuit, third rectification circuit and drive
Dynamic signal source is successively linked in sequence；
Voltage-to-current conversion circuit, the 4th follow circuit, isolation circuit and source driving signal to be successively linked in sequence.
Source driving signal exports bipolar voltage signal, and bipolar voltage signal follows electricity through the first amplifying circuit, first
It will be within the scope of the voltage scaling to stop voltage value of source driving signal output behind road；
Voltage after scaling follows circuit, the second rectification circuit to be back to source driving signal through the second amplifying circuit, second
Place carries out amplitude readback measurement monitoring, the work correctness in reliable monitoring driving circuit itself；
Voltage after scaling generates bipolar current signal through voltage to current converter circuit and carrys out driving steam turbine pitch, just
Operation is carried out out to electric current driving pitch, negative current can drive pitch to carry out pass operation；
The current signal for flowing through sampling resistor returns after third amplifying circuit, third follow circuit, third rectification circuit
It is back at source driving signal and carries out secondary amplitude readback measurement monitoring, reliable monitoring device builtin voltage to current converter circuit
The circuit patency of the correctness that works and the entire driving circuit to steam turbine pitch.
Stop voltage value range is the stop voltage of voltage-to-current conversion circuit.
Voltage-to-current conversion circuit includes current-limiting resistance, can configure different current limliting current limlitings.
It more preferably, further include warning device, warning device connects source driving signal.
A kind of reliability steam turbine pitch driving method of the secondary readback monitoring circuit of band, based on a kind of secondary readback prison of band
The reliability steam turbine pitch driving device on survey time road carries out the driving of steam turbine pitch, specifically includes the following steps:
Control source driving signal export bipolar voltage signal, bipolar voltage signal through the first amplifying circuit, first with
With within the scope of the voltage scaling to stop voltage value for exporting source driving signal after circuit；
Voltage after scaling follows circuit, the second rectification circuit to be back to source driving signal through the second amplifying circuit, second
Place carries out amplitude readback measurement monitoring, the work correctness in reliable monitoring driving circuit itself；
Voltage after scaling generates bipolar current signal through voltage to current converter circuit and carrys out driving steam turbine pitch, just
Operation is carried out out to electric current driving pitch, negative current can drive pitch to carry out pass operation；
Bipolar current signal flows through sampling resistor, flows through the current signal of sampling resistor by third amplifying circuit, the
Three follow to be back to after circuit, third rectification circuit at source driving signal and carry out secondary amplitude readback measurement monitoring, reliable to monitor
The circuit of work correctness of the device builtin voltage to current converter circuit and the entire driving circuit to steam turbine pitch is logical
Smooth property.
Compared with prior art, the beneficial effects obtained by the present invention are as follows including: that the present invention passes through first order readback measurement prison
The work correctness and second level readback for surveying driving circuit itself measure monitoring device builtin voltage to electric current conversing circuits
Work correctness and to steam turbine pitch entire driving circuit circuit patency second level readback measure monitoring mode, prison
It measures abnormal read back waveform and provides warning message at the first time to operator.Can effectively improve steam turbine pitch driving device can
Monitoring property, to improve the operational reliability of entire unit.
Detailed description of the invention
Fig. 1 is a kind of reliability steam turbine pitch driving device structure signal of secondary readback monitoring circuit of band of the present invention
Figure；
Fig. 2 is the driving of reliability steam turbine pitch driving device and readback of a kind of secondary readback monitoring circuit of band of the present invention
Schematic diagram；
Fig. 3 is that a kind of reliability steam turbine pitch driving device voltage and current of the secondary readback monitoring circuit of band of the present invention turns
Change schematic diagram.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of reliability steam turbine pitch driving device of the secondary readback monitoring circuit of band, including driving letter
Number source, internal signal conditioning circuit and voltage-to-current conversion circuit, source driving signal, internal signal conditioning circuit and voltage are extremely
Current converter circuit is successively linked in sequence, and voltage-to-current conversion circuit is connected with steam turbine pitch, and internal signal improves back
First amplitude read back circuit and polarity read back circuit are provided between road and source driving signal；Voltage-to-current conversion circuit and drive
The second amplitude read back circuit is provided between dynamic signal source.
Internal signal conditioning circuit includes that the first amplifier and first follows circuit；
First amplitude read back circuit follows circuit and the second rectification circuit including the second amplifier, second；
Second amplitude read back circuit includes that third amplifier, third follow circuit, third rectification circuit and sampling resistor；
Polarity read back circuit follows circuit and isolation circuit including the 4th；
Source driving signal, the first amplifier, first follow circuit and voltage-to-current conversion circuit to be successively linked in sequence；
Voltage-to-current conversion circuit, the second amplifier, second follow circuit, the second rectification circuit and source driving signal according to
Secondary sequential connection；
Voltage-to-current conversion circuit, sampling resistor, third amplifier, third follow circuit, third rectification circuit and drive
Dynamic signal source is successively linked in sequence；
Voltage-to-current conversion circuit, the 4th follow circuit, isolation circuit and source driving signal to be successively linked in sequence.
As shown in Fig. 2, source driving signal export bipolar voltage signal, bipolar voltage signal through the first amplifying circuit,
First follows within the scope of the voltage scaling to stop voltage value for exporting source driving signal after circuit；
Voltage after scaling follows circuit, the second rectification circuit to be back to source driving signal through the second amplifying circuit, second
Place carries out amplitude readback measurement monitoring, the work correctness in reliable monitoring driving circuit itself；
Voltage after scaling generates bipolar current signal through voltage to current converter circuit and carrys out driving steam turbine pitch, just
Operation is carried out out to electric current driving pitch, negative current can drive pitch to carry out pass operation；
The current signal for flowing through sampling resistor returns after third amplifying circuit, third follow circuit, third rectification circuit
It is back at source driving signal and carries out secondary amplitude readback measurement monitoring, reliable monitoring device builtin voltage to current converter circuit
The circuit patency of the correctness that works and the entire driving circuit to steam turbine pitch.
Stop voltage value range is the stop voltage of voltage-to-current conversion circuit, and the present embodiment is [- 3v ,+3v].
Voltage-to-current conversion circuit includes current-limiting resistance, can configure different current limliting current limlitings.
It further include warning device, warning device connects source driving signal.
Reliability steam turbine pitch driving device based on a kind of secondary readback monitoring circuit of band carries out the drive of steam turbine pitch
It is dynamic, specifically includes the following steps:
Control source driving signal export bipolar voltage signal, bipolar voltage signal through the first amplifying circuit, first with
With within the scope of the voltage scaling to stop voltage value for exporting source driving signal after circuit；
Voltage after scaling follows circuit, the second rectification circuit to be back to source driving signal through the second amplifying circuit, second
Place carries out amplitude readback measurement monitoring, the work correctness in reliable monitoring driving circuit itself；
Voltage after scaling generates bipolar current signal through voltage to current converter circuit and carrys out driving steam turbine pitch, just
Operation is carried out out to electric current driving pitch, negative current can drive pitch to carry out pass operation；
Bipolar current signal flows through sampling resistor, flows through the current signal of sampling resistor by third amplifying circuit, the
Three follow to be back to after circuit, third rectification circuit at source driving signal and carry out secondary amplitude readback measurement monitoring, reliable to monitor
The circuit of work correctness of the device builtin voltage to current converter circuit and the entire driving circuit to steam turbine pitch is logical
Smooth property.
First and second readback measurement monitoring circuit shares same polarity observation circuit to differentiate that output drive signal is polar just
True property.The abnormal read back waveform monitored can provide warning message to operator at the first time.
As shown in figure 3, in the present embodiment, source driving signal output ± 15V bipolar voltage signal, bipolar voltage letter
Number ± 3V bipolar voltage signal is zoomed to by the first amplifying circuit, follow circuit output to voltage to electric current to convert through first
Circuit.
± 3V the signal that ± 15V voltage signal scaling comes passes through the second amplifying circuit, and second follows circuit, the second rectified current
0-3V electrode signal is generated behind road and is back to source driving signal progress readback monitoring, and monitoring signals are the width of voltage
Value.
Meanwhile ± 3V the signal that ± 15V voltage signal scaling comes returns after the 4th follows circuit, the 4th isolation circuit
Readback monitoring is carried out to source driving signal, monitoring signals are the polarity of voltage, common pole of the polarity as first and second readback
Property.
Difference of the voltage-to-current conversion circuit according to required output driving current, the different current-limiting resistance of inside configuration,
With voltage value divided by resistance value for required current value.Usually ± 40mA and two kinds of ± 50mA.
The current signal of voltage-to-current conversion circuit road output first passes through sampling resistor, rear to pass through live hardwire connection
To live steam turbine pitch, to control opening for live pitch by output opposed polarity, different size of current value to realize
Close direction and switching rate.
Electric current flows through sampling resistor, can generate voltage signal at resistance both ends by I*R, this voltage signal amplifies by third
Circuit, third follow circuit, third rectification circuit to generate 0-3V electrode signal, which measures as secondary readback and supervise
Signal is surveyed, monitoring signals are the amplitude of voltage.The work correctness and device that voltage-to-current conversion circuit can effectively be detected are extremely
Whether the hardwire current loop of steam turbine pitch unobstructed, if there are virtual connection, broken string and so on.
Succeed at present by the reliability steam turbine pitch driving device with secondary readback monitoring circuit that this method designs
It is actually used applied to DEH system engineering, passes through the work correctness and external drive of on-Line Monitor Device driving circuit itself
The reliability of circuit connection, and abnormal conditions are reported to the placement of operator by type of alarm at the first time, it greatly improves
The detectability of steam turbine pitch driving device obtains good engineering using effect to provide the reliability of unit entirety.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.The above is only the preferred embodiment of the present invention, it should be pointed out that: for the art
Those of ordinary skill for, various improvements and modifications may be made without departing from the principle of the present invention, these change
It also should be regarded as protection scope of the present invention into retouching.
Claims (7)
1. a kind of reliability steam turbine pitch driving device of the secondary readback monitoring circuit of band, it is characterised in that:
Including source driving signal, internal signal conditioning circuit and voltage-to-current conversion circuit, source driving signal, internal signal tune
Reason circuit and voltage-to-current conversion circuit are successively linked in sequence, and are provided between internal signal conditioning circuit and source driving signal
First amplitude read back circuit and polarity read back circuit；The second width is provided between voltage-to-current conversion circuit and source driving signal
It is worth read back circuit.
2. a kind of reliability steam turbine pitch driving device of the secondary readback monitoring circuit of band according to claim 1,
It is characterized in that:
Internal signal conditioning circuit includes that the first amplifier and first follows circuit；
First amplitude read back circuit follows circuit and the second rectification circuit including the second amplifier, second；
Second amplitude read back circuit includes that third amplifier, third follow circuit, third rectification circuit and sampling resistor；
Polarity read back circuit follows circuit and isolation circuit including the 4th；
Source driving signal, the first amplifier, first follow circuit and voltage-to-current conversion circuit to be successively linked in sequence；
Voltage-to-current conversion circuit, the second amplifier, second follow circuit, the second rectification circuit and source driving signal successively suitable
Sequence connection；
Voltage-to-current conversion circuit, sampling resistor, third amplifier, third follow circuit, third rectification circuit and driving letter
Number source is successively linked in sequence；
Voltage-to-current conversion circuit, the 4th follow circuit, isolation circuit and source driving signal to be successively linked in sequence.
3. a kind of reliability steam turbine pitch driving device of the secondary readback monitoring circuit of band according to claim 2,
It is characterized in that:
Source driving signal exports bipolar voltage signal, and bipolar voltage signal is after the first amplifying circuit, first follow circuit
It will be within the scope of the voltage scaling to stop voltage value of source driving signal output；
Voltage after scaling through the second amplifying circuit, second follow circuit, the second rectification circuit be back at source driving signal into
Amplitude readback of row measurement monitoring；
Voltage after scaling generates bipolar current signal through voltage to current converter circuit and comes driving steam turbine pitch, positive electricity
Stream driving pitch carries out out operation, and negative current can drive pitch to carry out pass operation；
The current signal for flowing through sampling resistor is back to after third amplifying circuit, third follow circuit, third rectification circuit
Secondary amplitude readback measurement monitoring is carried out at source driving signal.
4. a kind of reliability steam turbine pitch driving device of the secondary readback monitoring circuit of band according to claim 2,
It is characterized in that:
Stop voltage value range is the stop voltage of voltage-to-current conversion circuit.
5. a kind of reliability steam turbine pitch driving device of the secondary readback monitoring circuit of band according to claim 2,
It is characterized in that:
Voltage-to-current conversion circuit includes current-limiting resistance, can configure different current limliting current limlitings.
6. a kind of reliability steam turbine pitch driving device of the secondary readback monitoring circuit of band according to claim 1,
It is characterized in that:
It further include warning device, warning device connects source driving signal.
7. a kind of reliability steam turbine pitch driving method of the secondary readback monitoring circuit of band, it is characterised in that:
Reliability steam turbine pitch driving device based on a kind of secondary readback monitoring circuit of band carries out the driving of steam turbine pitch, tool
Body the following steps are included:
It controls source driving signal and exports bipolar voltage signal, bipolar voltage signal follows electricity through the first amplifying circuit, first
It will be within the scope of the voltage scaling to stop voltage value of source driving signal output behind road；
Voltage after scaling through the second amplifying circuit, second follow circuit, the second rectification circuit be back at source driving signal into
Amplitude readback of row measurement monitoring；
Voltage after scaling generates bipolar current signal through voltage to current converter circuit and comes driving steam turbine pitch, positive electricity
Stream driving pitch carries out out operation, and negative current can drive pitch to carry out pass operation；
Bipolar current signal flows through sampling resistor, flow through the current signal of sampling resistor by third amplifying circuit, third with
Secondary amplitude readback measurement monitoring is carried out with being back at source driving signal after circuit, third rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811249846.3A CN109444625A (en) | 2018-10-25 | 2018-10-25 | Reliability steam turbine pitch driving device and method with secondary readback monitoring circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811249846.3A CN109444625A (en) | 2018-10-25 | 2018-10-25 | Reliability steam turbine pitch driving device and method with secondary readback monitoring circuit |
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| CN109444625A true CN109444625A (en) | 2019-03-08 |
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|---|---|---|---|
| CN201811249846.3A Pending CN109444625A (en) | 2018-10-25 | 2018-10-25 | Reliability steam turbine pitch driving device and method with secondary readback monitoring circuit |
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Application publication date: 20190308 |