CN213398613U - Black start does not have tacho sensor generator rotational speed measuring device - Google Patents

Abstract

The utility model relates to a black start generator rotating speed measuring device without a speed measuring sensor, which comprises a power supply module, a rotating speed measuring module, a main control module and a display module; the device inserts the signal input part of rotational speed measurement module in original generator frequency changer standby channel to convert the 4-20mA frequency signal of generator frequency changer standby channel output into 0-5V voltage signal, carry out the voltage volume collection and restore by host system, obtained generator frequency physical value, through electric power system frequency and rotational speed conversion relation with electrical frequency conversion for electric rotational speed, host system will survey electric rotational speed and transmit to display module communication port through the communication port and carry out the field display, the utility model discloses not restricted by the service condition of acceleration sensor, also overcome the defect and not enough that current generator rotational speed measurement exists, can provide accurate generator electricity gas rotational speed volume for generator normal operating or when carrying out black start, make things convenient for field work personnel to read and record.

Description

Black start does not have tacho sensor generator rotational speed measuring device

Technical Field

The utility model belongs to the technical field of black start, concretely relates to black start does not have tacho sensor generator rotational speed measuring device.

Background

Before the generator in the power system is not connected to the grid, the speed regulator is in a speed control mode, namely, the rotating speed of the generator is always maintained at a rated rotating speed, after the generator is connected to the grid, the rotating speed is maintained to be consistent with that of the full-grid synchronous generator, the speed regulator is in a power control mode, and the power of a prime motor is changed to follow a schedule to issue a plan curve. The rotating speed of the synchronous generator is an important parameter in a power plant, the rotating speed must be constantly maintained within a specified and allowed rated rotating speed range of a power grid, and therefore the power grid adopts the technical means of primary frequency modulation, secondary frequency modulation and tertiary frequency modulation to ensure that the frequency of the whole power grid is within the allowed range, namely all synchronous generators in the power grid adjust the self output according to the change of load. When the generator is started in black, the output line is in an idle mode, the rotating speed of the generator after constant speed is an important judgment parameter, if the rotating speed of the generator is too high or even cannot be controlled, the generator can be quickly stopped by overspeed protection, if overspeed protection cannot be operated due to reasons, serious accidents of generator runaway can be caused, too many runaway accidents caused by people or other reasons happen in the history of a power system, in order to ensure the safety of the generator, two sets of speed measuring devices are required to be configured in the regulation system of a small generator, one set adopts a mechanical rotating fluted disc quantity prime motor rotating speed method, the other set needs to measure the rotating speed of the generator, at present, devices for measuring the rotating speed of the generator by adopting light diffuse reflection and electric eddy current are adopted, and after a period of operation, the sealed oil of the generator shaft is thrown out, so that the speed measuring sensor fails, the staff must clear up sensor dirt, but still can also appear the same condition in a period of time again, need install extra speed measuring support at the generator body simultaneously, is unfavorable for generator body mechanical safety, has caused the on-the-spot installation extremely difficult in addition.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a black start does not have tacho sensor generator rotational speed measuring device, realize the electric rotational speed that does not have tacho sensor measuring generator, the reserve output channel of current generator frequency changer of ingenious utilization, by the accurate conversion and the measurement of device realization frequency to rotational speed, and show by display module display, the device is installed on the next door that tests the speed with traditional mechanical fluted disc, do benefit to two kinds of rotational speed parameter contrast, in time discover the difference reason of physics rotational speed and electric rotational speed, for generator safety and stability operation driving protection.

The utility model discloses a realize through following technical scheme:

the utility model provides a black start does not have tacho sensor generator rotational speed measuring device, includes rotational speed measuring module, host system and display module, rotational speed measuring module current signal input port links to each other with the reserve output channel of generator frequency changer, and rotational speed measuring module voltage signal output port links to each other with host system analog quantity acquisition port, rotational speed measuring module is used for converting the reserve 4-20mA current signal of output of generator frequency changer into 0-5V voltage signal, host system is used for gathering, converting the 0-5V voltage signal of rotational speed measuring module transmission into generator electrical speed value, host system communication port links to each other with display module's communication port, and display module is used for showing the electrical volume signal of generator rotational speed.

Preferably, the power supply module outputs a 5V power supply, the rotating speed measuring module, the main control module and the display module, and is used for supplying power to the rotating speed measuring module, the main control module and the display module, and the input end of the power supply module is connected with a 220V single-phase alternating current power supply.

Preferably, the rotating speed measuring module comprises a current input interface and an I/V current-voltage conversion module, two pins of the current input interface are connected with the standby output channel of the generator frequency transmitter, two pins of the current input interface are connected with the 4-20mA current channel of the I/V current-voltage conversion module, and the 0-5V voltage output end of the I/V current-voltage conversion module is connected with the analog input port of the main control module.

Furthermore, the I/V current-voltage conversion module adopts a TE1660N type I/V current-voltage conversion module, the precision reaches 0.1%, and the linearity is 0.1%.

Preferably, the main control module comprises a power interface, a processor and a display interface, the power interface is connected with an output power of the power supply module, the power interface is connected with power pins of the processor and the display interface, a serial communication port of the processor is connected with a serial communication pin of the display interface, and an output 0-5V voltage end of the I/V current-voltage conversion module of the analog quantity acquisition port of the processor is connected.

Furthermore, the processor in the main control module adopts an STC8G1K08A type 8-bit single chip microcomputer with 8 pins, the packaging form is SOP patch packaging, the Flash space is 8KB, the SRAM cache space is 1.2KB, the EEPROM space is 4KB, and the ADC analog quantity acquisition separation rate is 10 bits.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model connects the signal input end of the rotating speed measuring module to the standby channel of the original generator frequency transmitter, and converts the 4-20mA frequency signal output by the standby channel of the generator frequency transmitter into a 0-5V voltage signal, the main control module collects and restores the voltage quantity to obtain the physical value of the generator frequency, convert electrical frequency into electric rotational speed through electric power system frequency and rotational speed conversion relation, host system will survey electric rotational speed through the communication port and transmit to display module communication port and carry out the on-the-spot demonstration, the utility model discloses not restricted by the service condition of speedtransmitter, also overcome the defect and not enough that current generator rotational speed measurement exists, can provide accurate generator electrical speed volume for generator normal operating or when carrying out black start, make things convenient for the field work personnel to read and take notes. The utility model discloses need not to install the support that tests the speed, be favorable to the safety of generator body equipment very much, the on-the-spot installation work load is little, and the field usage of being convenient for can have very strong spreading value in various power fields popularization and application, has solved two sets of problems of testing the speed simultaneously, can be long-time reliable, the operation of non-maintaining.

Further, the utility model discloses the reserve output channel of original generator frequency changer is inserted to the rotational speed measurement module, has reduced the expense of purchasing special tacho sensor, has reduced the on-the-spot installation degree of difficulty, also easily later maintenance operation.

Furthermore, the utility model discloses with the accurate conversion of the 4-20mA current signal of the reserve output channel output of original generator frequency changer, keep apart output 0-5V voltage signal, strengthened the interference killing feature of device.

Further, the utility model discloses power module output 5V direct current voltage can satisfy all power supply demands of work to adopt ripe switching power supply product.

Further, the utility model discloses main control module simple structure only has analog quantity to gather port and communication port, and the download procedure of being convenient for realizes converting rotational speed electric quantity signal into electrical physics volume rotational speed to the transmission shows for display module.

Further, the utility model discloses display module adopts integrated charactron display module, simple structure, and job stabilization easily ready-made and mechanical rotational speed measuring device's contrast in time discovers the problem of rotational speed difference reason and mechanical rotational speed to the electric volume rotational speed conversion link of generator.

Drawings

Fig. 1 is a schematic block diagram of the device of the present invention.

Fig. 2 is a circuit diagram of the rotation speed measuring module of the present invention.

Fig. 3 is a circuit diagram of the main control module of the present invention.

In the figure: a power supply module 1; a rotating speed measuring module 2; a main control module 3; a display module 4.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

The utility model discloses can solve optic fibre diffuse reflection and eddy current sensor and measure that there is sensor inefficacy and the inconvenient problem of field installation in the generator rotational speed, provide a black start that is convenient for install, does not have tacho sensor, long-time operation is reliable does not have tacho sensor generator rotational speed measuring device.

The utility model relates to a black start generator rotation speed measuring device without a tachometer sensor, which comprises a rotation speed measuring module 2, a main control module 3 and a display module 4 as shown in figure 1, the current signal input port of the rotating speed measuring module 2 is connected with the standby output channel of the generator frequency transmitter, the voltage signal output port of the rotating speed measuring module 2 is connected with the analog quantity acquisition port of the main control module 3, the rotating speed measuring module 2 is used for converting a 4-20mA current signal output by the generator frequency transmitter standby into a 0-5V voltage signal, the main control module 3 is used for collecting and converting the 0-5V voltage signal transmitted by the rotating speed measuring module 2 into an electric rotating speed value of the generator, the communication port of the main control module 3 is connected with the communication port of the display module 4, and the display module 4 is used for displaying the electric quantity signal of the rotating speed of the generator.

In this embodiment, still include power module 1, power module 1 outputs 5V power and rotational speed measurement module 2, host system 3, display module 4 for rotational speed measurement module 2, host system 3, display module 4 power supply, power module 1 input links to each other with 220V single-phase alternating current power.

In this embodiment, the rotation speed measuring module 2 includes a current input interface and an I/V current-voltage conversion module, two pins of the current input interface are connected to the standby output channel of the generator frequency transmitter, two pins of the current input interface are connected to the 4-20mA current channel of the I/V current-voltage conversion module, and the 0-5V voltage output end of the I/V current-voltage conversion module is connected to the analog input port of the main control module 3.

In this embodiment, as shown in fig. 2, the rotation speed measuring module 2 includes a current input interface J1 and an I/V current-voltage converting module I1, a 1 st pin of the current input interface J1 is connected to a positive polarity end of a standby output channel of a generator frequency transmitter, a 2 nd pin of the current input interface J1 is connected to a negative polarity end of the standby output channel of the generator frequency transmitter, a 1 st pin and a 2 nd pin of the current input interface J1 are respectively connected to a 3 rd pin and a 4 th pin of the I/V current-voltage converting module I1, a 1 st pin of the I/V current-voltage converting module I1 is connected to a 5V voltage output by the power supply module 1, and a 2 nd pin and a 6 th pin of the I/V current-voltage converting module I1 and a 2 nd pin of the current input interface J1 are connected to a negative; the 5 th pin and the 6 th pin of the I/V current-voltage conversion module I1 are connected with the analog quantity acquisition port of the main control module 3.

In this embodiment, the I/V current-voltage conversion module adopts a TE1660N type I/V current-voltage conversion module, with an accuracy of 0.1% and a linearity of 0.1%.

In this embodiment, the main control module 3 includes a power interface, a processor and a display interface, the power interface is connected to the output power of the power supply module 1, the power interface is connected to the processor and the power pin of the display interface, the serial communication port of the processor is connected to the serial communication pin of the display interface, and the I/V current-voltage conversion module of the analog quantity acquisition port of the processor is connected to the output voltage of 0-5V.

In this embodiment, the main control module 3 converts the Nc-60 (Ux) (fmax-fmin)/5 into the electrical rotating speed of the generator, where the Nc converts the electrical rotating speed of the generator, the unit is r/min, Ux is a measured voltage value, fmax is the maximum range of the frequency transmitter, fmin is the minimum range of the frequency transmitter, and the main control module 3 transmits the measured Nc to the display module 4 for display.

In this embodiment, the processor in the main control module 3 adopts an STC8G1K08A type 8-bit single chip microcomputer, which has 8 pins, and the package form is an SOP patch package, the Flash space is 8KB, the SRAM cache space is 1.2KB, the EEPROM space is 4KB, and the ADC analog acquisition resolution is 10 bits.

In this embodiment, as shown in fig. 3, the main control module 3 includes a power interface D1, a processor U1, a capacitor C1, and a display interface XS1, a 1 st pin of the power interface D1 is connected to a 5V voltage output by the power module 1, a 2 nd pin of the power interface D1 is connected to a negative electrode output by the power module 1, a 2 nd pin and a 4 th pin of the processor U1 are respectively connected to a 1 st pin and a 2 nd pin of the power interface D1, a 1 st pin and a 4 th pin of the display interface XS1 are respectively connected to a 1 st pin and a 2 nd pin of the power interface D1, an 8 th pin of the processor U1 is connected to a 5 th pin of the I/V current-voltage conversion module I1, a 6 th pin and a 5 th pin of the processor U1 are respectively connected to a 2 nd pin and a 3 rd pin of the display interface XS1, and two ends of the capacitor C are connected in parallel between a 2 nd pin and a; the 8 th pin of the processor U1 is an analog quantity acquisition port, the 6 th pin and the 5 th pin of the processor U1 are serial communication ports, the 2 nd pin and the 3 rd pin of the display interface XS1 are serial communication ports, and the display interface XS1 is connected with an external integrated red light nixie tube display module.

The utility model relates to a black start does not have tacho sensor generator rotational speed measuring device, when carrying out rotational speed measurement, including following step:

1) installing a black-start generator rotating speed measuring device without a tachometer sensor beside a mechanical rotating speed measuring device, and entering the step 2);

2) connecting a current input interface in the rotating speed measuring module 2 to a standby output channel of the generator frequency transmitter through a cable, and entering the step 3);

3) setting fmax as the maximum range of the frequency transmitter and fmin as the minimum range of the frequency transmitter in the main control module 3, and entering the step 4);

4) turning on a switch of the power supply module 1, and entering the step 5);

5) the main control module 3 converts the input frequency current signal into the generator electrical quantity rotating speed through Nc ═ 60(Ux) (fmax-fmin)/5, and displays the rotating speed through the display module 4.

When the black start or normal operation is carried out, the rotating speed of the electric quantity of the generator is read through the display module 4, and compared with the rotating speed measured by the mechanical rotating speed device, the accuracy requirement can be met.

The above, only the utility model discloses a preferred embodiment, it is not right the utility model discloses a do any restriction, all according to the utility model discloses any simple modification, change and the equivalent structure change of technical essence to doing above embodiment all still belong to the utility model discloses technical scheme's within the scope of protection.

Claims (6)

1. A black start generator rotating speed measuring device without a tachometer sensor is characterized by comprising a rotating speed measuring module (2), a main control module (3) and a display module (4), wherein a current signal input port of the rotating speed measuring module (2) is connected with a standby output channel of a generator frequency transmitter, a voltage signal output port of the rotating speed measuring module (2) is connected with an analog quantity acquisition port of the main control module (3), the rotating speed measuring module (2) is used for converting a 4-20mA current signal output by the generator frequency transmitter into a 0-5V voltage signal, the main control module (3) is used for acquiring and converting a 0-5V voltage signal transmitted by the rotating speed measuring module (2) into a generator electrical rotating speed value, a communication port of the main control module (3) is connected with a communication port of the display module (4), the display module (4) is used for displaying the rotating speed of the electric quantity of the rotating speed of the generator.

2. The generator speed measuring device of claim 1, further comprising a power supply module (1), wherein the power supply module (1) outputs a 5V power supply and speed measuring module (2), a main control module (3), and a display module (4) for supplying power to the speed measuring module (2), the main control module (3), and the display module (4), and an input end of the power supply module (1) is connected to a 220V single-phase ac power supply.

3. The generator speed measuring device of claim 1, wherein the speed measuring module (2) comprises a current input interface and an I/V current-voltage conversion module, two pins of the current input interface are connected to the standby output channel of the generator frequency transmitter, two pins of the current input interface are connected to the 4-20mA current channel of the I/V current-voltage conversion module, and the 0-5V voltage output end of the I/V current-voltage conversion module is connected to the analog input port of the main control module (3).

4. The device of claim 3, wherein the I/V current-to-voltage conversion module is a TE1660N I/V current-to-voltage conversion module, the accuracy is 0.1%, and the linearity is 0.1%.

5. The device for measuring the rotating speed of the generator without the tachometer sensor in the black start according to claim 1, wherein the main control module (3) comprises a power interface, a processor and a display interface, the power interface is connected with the output power of the power supply module (1), the power interface is connected with the power pins of the processor and the display interface, the serial communication port of the processor is connected with the serial communication pin of the display interface, and the I/V current-voltage conversion module of the analog quantity acquisition port of the processor is connected with the output voltage end of 0-5V.

6. The device for measuring the rotation speed of the generator without the tachometer sensor in the black start as claimed in claim 5, wherein the processor in the main control module (3) adopts an STC8G1K08A type 8-bit single chip microcomputer with 8 pins, the package form is an SOP chip package, the Flash space is 8KB, the SRAM buffer space is 1.2KB, the EEPROM space is 4KB, and the ADC analog quantity acquisition resolution is 10 bits.

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