CN215804742U - Turbine overspeed protection system - Google Patents
Turbine overspeed protection system Download PDFInfo
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- CN215804742U CN215804742U CN202122178766.7U CN202122178766U CN215804742U CN 215804742 U CN215804742 U CN 215804742U CN 202122178766 U CN202122178766 U CN 202122178766U CN 215804742 U CN215804742 U CN 215804742U
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Abstract
The utility model provides a turbine overspeed protection system; the device comprises a rotating speed detection module, a low-pass module, a high-pass module and a comparison module, wherein the rotating speed detection module detects the rotating speed of the steam turbine, the rotating speed detection module amplifies signals, then the signals are filtered by the low-pass module and then input to the high-pass module for amplification in the same proportion, and the amplified signals are input to a comparison circuit and then input to a controller after being compared. The utility model can compare the change condition of the rotor rotation speed with the normal threshold value of the rotor in the operation process of the steam turbine, thereby avoiding the fault of the steam turbine caused by the fact that the rotor is not noticed by people after the abnormality occurs.
Description
Technical Field
The utility model relates to a turbine overspeed protection system.
Background
The domestic research on the aspect of the vibration fault diagnosis of the steam turbine originates from the eighties of the last century, and due to the particularity of the vibration of the domestic turbine, technicians have unique insights on the aspects of the vibration fault diagnosis method and the fault mechanism research compared with foreign technicians, and abundant knowledge is accumulated on the aspect of the vibration fault characteristics of the turbine through the practice of field fault diagnosis for many years. The fault diagnosis is divided from the specific implementation modes into online diagnosis and offline diagnosis, wherein the online diagnosis is used for roughly diagnosing the vibration fault reason of the steam turbine unit in the operating state so that an operator can make corrective operation to prevent the accident from expanding, and therefore the diagnosis time requirement is very urgent. In the prior art, automatic equipment for online vibration fault detection is available, and the equipment systematizes, organizes and integrates scattered expert experience, so that the vibration fault is detected through a logic device. Compared with off-line diagnosis, on-line diagnosis in the prior art has certain timeliness, but the abnormal vibration is found based on artificial observation, and then the abnormal vibration is detected through instrument equipment, so that the on-line diagnosis mode still has obvious hysteresis and is not suitable for the production and development requirements of modern enterprises.
The causes of the abnormal vibration of the steam turbine generally include the following aspects: improper rotor installation, uneven rotor mass distribution, wear of components due to motion friction, and the like. The abnormal vibration of the steam turbine caused by the reasons can be shown in a specific form, but in the prior art, no comprehensive and reasonably designed equipment can judge whether the abnormal vibration occurs or not by detecting weak and special working conditions when the abnormal vibration occurs.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a turbine overspeed protection system.
The utility model is realized by the following technical scheme.
The utility model provides a turbine overspeed protection system; the device comprises a rotating speed detection module, a low-pass module, a high-pass module and a comparison module, wherein the rotating speed detection module detects the rotating speed of the steam turbine, the rotating speed detection module amplifies signals, then the signals are filtered by the low-pass module and then input to the high-pass module for amplification in the same proportion, and the amplified signals are input to a comparison circuit and then input to a controller after being compared.
The rotating speed detection module comprises an amplifier A1, a positive phase input end of the amplifier A1 is connected with the rotating speed detection device through a resistor R7, an inverse phase input end of the amplifier A1 is sequentially connected with a resistor R7 and a capacitor C3 and then is grounded, a positive power supply end of the amplifier A1 is connected with a power supply VCC, and a negative power supply end of the amplifier A1 is grounded.
The output end of the amplifier A1 is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the low-pass module.
The low-pass module comprises a resistor R1 and a capacitor C1, one end of the resistor R1 is connected with the negative electrode of the diode D1, the other end of the resistor R1 is connected with the capacitor C1, and the other end of the capacitor C1 is grounded.
The high-pass module comprises a resistor R3 and a capacitor C2, one end of the capacitor C2 is connected with the other end of the resistor R1, the other end of the capacitor C2 is connected with one end of the resistor R3 and the positive-phase input end of an amplifier A2, and the other end of the resistor R3 is grounded.
The non-inverting input end of the amplifier A2 is connected with the other end of the capacitor C2, the inverting input end of the operational amplifier A2 is respectively connected with one end of a resistor R4 and one end of a resistor R5, and the other end of the resistor R4 is grounded; the other end of the resistor R5 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a capacitor C2, the output end of the operational amplifier A2 is connected to the connection between the other end of the resistor R5 and one end of the resistor R2, and the output end of the amplifier A2 is connected with the comparison circuit.
The comparison circuit comprises a comparator U1A, wherein the inverting input end of the comparator U1A is connected with the output end of an amplifier A2, the non-inverting input end of the comparator U1 is connected with a programmable threshold, the output end of the comparator U1 is connected with a controller, the positive pole of the power supply end of the comparator U1 is connected with a power supply VCC, and the negative pole of the power supply end of the comparator U1 is grounded.
The utility model has the beneficial effects that: the change condition of the rotating speed of the rotor can be detected in the operation process of the steam turbine to be compared with the normal threshold value of the rotor, and the problem that the steam turbine fails because the rotor is not noticed by people after abnormality occurs is avoided.
Drawings
FIG. 1 is a circuit schematic of the present invention;
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A turbine overspeed protection system; the device comprises a rotating speed detection module, a low-pass module, a high-pass module and a comparison module, wherein the rotating speed detection module detects the rotating speed of the steam turbine, the rotating speed detection module amplifies signals, then the signals are filtered by the low-pass module and then input to the high-pass module for amplification in the same proportion, and the amplified signals are input to a comparison circuit and then input to a controller after being compared.
The rotating speed detection module comprises an amplifier A1, a positive phase input end of the amplifier A1 is connected with the rotating speed detection device through a resistor R7, an inverse phase input end of the amplifier A1 is sequentially connected with a resistor R7 and a capacitor C3 and then is grounded, a positive power supply end of the amplifier A1 is connected with a power supply VCC, and a negative power supply end of the amplifier A1 is grounded.
The output end of the amplifier A1 is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the low-pass module.
The low-pass module comprises a resistor R1 and a capacitor C1, one end of the resistor R1 is connected with the negative electrode of the diode D1, the other end of the resistor R1 is connected with the capacitor C1, and the other end of the capacitor C1 is grounded.
The high-pass module comprises a resistor R3 and a capacitor C2, one end of the capacitor C2 is connected with the other end of the resistor R1, the other end of the capacitor C2 is connected with one end of the resistor R3 and the positive-phase input end of an amplifier A2, and the other end of the resistor R3 is grounded.
The non-inverting input end of the amplifier A2 is connected with the other end of the capacitor C2, the inverting input end of the operational amplifier A2 is respectively connected with one end of a resistor R4 and one end of a resistor R5, and the other end of the resistor R4 is grounded; the other end of the resistor R5 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a capacitor C2, the output end of the operational amplifier A2 is connected to the connection between the other end of the resistor R5 and one end of the resistor R2, and the output end of the amplifier A2 is connected with the comparison circuit.
The comparison circuit comprises a comparator U1A, wherein the inverting input end of the comparator U1A is connected with the output end of an amplifier A2, the non-inverting input end of the comparator U1 is connected with a programmable threshold, the output end of the comparator U1 is connected with a controller, the positive pole of the power supply end of the comparator U1 is connected with a power supply VCC, and the negative pole of the power supply end of the comparator U1 is grounded.
The utility model detects the rotating speed of the steam turbine in the operation process, the rotating speed signal is amplified in the first stage and low-pass filtered, then the rotating speed signal is amplified in the second stage in the same proportion and enters the comparator, the threshold value signal of the normal rotating speed of the steam turbine preset by the programmable threshold value device is also input into the comparator, the comparator compares the two signals and then inputs the abnormal signal into the controller, and the controller gives an alarm and the like to protect the action of the steam turbine.
Claims (7)
1. A turbine overspeed protection system characterized in that: the device comprises a rotating speed detection module, a low-pass module, a high-pass module and a comparison module, wherein the rotating speed detection module detects the rotating speed of the steam turbine, the rotating speed detection module amplifies signals, then the signals are filtered by the low-pass module and then input to the high-pass module for amplification in the same proportion, and the amplified signals are input to a comparison circuit and then input to a controller after being compared.
2. The turbine overspeed protection system of claim 1, wherein: the rotating speed detection module comprises an amplifier A1, a positive phase input end of the amplifier A1 is connected with the rotating speed detection device through a resistor R7, an inverse phase input end of the amplifier A1 is sequentially connected with a resistor R7 and a capacitor C3 and then is grounded, a positive power supply end of the amplifier A1 is connected with a power supply VCC, and a negative power supply end of the amplifier A1 is grounded.
3. The turbine overspeed protection system of claim 2, wherein: the output end of the amplifier A1 is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the low-pass module.
4. The turbine overspeed protection system of claim 1, wherein: the low-pass module comprises a resistor R1 and a capacitor C1, one end of the resistor R1 is connected with the negative electrode of the diode D1, the other end of the resistor R1 is connected with the capacitor C1, and the other end of the capacitor C1 is grounded.
5. The turbine overspeed protection system of claim 1, wherein: the high-pass module comprises a resistor R3 and a capacitor C2, one end of the capacitor C2 is connected with the other end of the resistor R1, the other end of the capacitor C2 is connected with one end of the resistor R3 and the positive-phase input end of an amplifier A2, and the other end of the resistor R3 is grounded.
6. The turbine overspeed protection system of claim 5, wherein: the non-inverting input end of the amplifier A2 is connected with the other end of the capacitor C2, the inverting input end of the amplifier A2 is respectively connected with one end of a resistor R4 and one end of a resistor R5, and the other end of the resistor R4 is grounded; the other end of the resistor R5 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with one end of a capacitor C2, the output end of the amplifier A2 is connected to the connection of the other end of the resistor R5 and one end of the resistor R2, and the output end of the amplifier A2 is connected with the comparison circuit.
7. The turbine overspeed protection system of claim 1, wherein: the comparison circuit comprises a comparator U1A, wherein the inverting input end of the comparator U1A is connected with the output end of an amplifier A2, the non-inverting input end of the comparator U1 is connected with a programmable threshold, the output end of the comparator U1 is connected with a controller, the positive pole of the power supply end of the comparator U1 is connected with a power supply VCC, and the negative pole of the power supply end of the comparator U1 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122178766.7U CN215804742U (en) | 2021-09-09 | 2021-09-09 | Turbine overspeed protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122178766.7U CN215804742U (en) | 2021-09-09 | 2021-09-09 | Turbine overspeed protection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215804742U true CN215804742U (en) | 2022-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122178766.7U Active CN215804742U (en) | 2021-09-09 | 2021-09-09 | Turbine overspeed protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215804742U (en) |
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2021
- 2021-09-09 CN CN202122178766.7U patent/CN215804742U/en active Active
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