The frequency domain analysis of the abnormal signal of the feedwater pump turbine speed sensor CS-I-D-065-05-01 needs to focus on the characteristic frequency and noise distribution. The output pulse signal of the sensor corresponds to the speed base frequency, and the spectrum under normal conditions is a single peak within the range of ±2% of the base frequency. When abnormal, the spectrum diagram often shows three types of characteristics:

 

First, the fundamental frequency amplitude attenuation is greater than 30% accompanied by the enhancement of the 2nd/3rd harmonics, indicating that the rotor dynamic balance is deteriorated or the coupling is misaligned;

 

Second, the high-frequency noise cluster that is irrelevant to the speed appears, which is mostly caused by oil mist contamination or electromagnetic interference of the sensor air gap;

 

Third, the low-frequency modulation side frequency usually reflects the looseness of the bearing seat or the gearbox meshing defect.

 

Based on the results of the frequency domain analysis, three-stage optimization is required: First, the sweep frequency vibration test is used to verify that the natural frequency of the speed sensor CS-I-D-065-05-01 avoids the resonance area of ​​the unit during the installation stage; second, the signal processing end is embedded with an adaptive notch filter to track and suppress the characteristic interference frequency in real time; finally, a spectrum baseline database is established to identify early abnormal patterns through machine learning.

 

YOYIK is located in Deyang, Sichuan Province, China. It is a well-known equipment and parts manufacturer in the power industry, focusing on the supply of parts for steam turbines, generators and hydroelectric generator sets. The company adheres to the principle of "technological innovation, quality first", adopts advanced production equipment and strict quality control system to provide high-quality products that meet international standards to global customers. YOYIK not only provides products, but also provides professional and comprehensive solutions for industries such as power, metallurgy, and chemical industry, helping customers improve equipment performance and optimize operating costs.

 

Yoyik can offer many spare parts for power plants as below:

 

#DF-Turbine pump on-site speed sensor CS-I-D-065-05-01-DF

Axial Displacement Sensor WT0112-A90-B00-C01

potentiometer for linear and angular position TDZ-1E-05 0-300

eddy current probe types PR6423/010-110

Bolt electric heating rod ZJ-14-2R

Linear variable differential transformer of the MSV valve C9231014

LVDT 4000TD-30-01

potentiometric position sensors HTD-350-3

LEVEL SWITCH LOW RC861CZ084HYR

LVDT Sensor TDZ-1E-12B

Limit switch 802T-AMTP

Speed monitoring display device NE9011

MINI D1 PRO DEVELOPMENT BOARD ESP8266 16M

Sensor DF312580-90-10-02

Serial Communication Card PCL-745B

Pressure Switch 9NN-K45-M4-C1A

LVDT Sensor Z96200WN

high pressure limit switch 453941-N12065

speed sensor DSD1820.19 S22HW

Turbidity meter 1720E

velocity sensor PR9268/015-100

Power board ME8.530.031 V1.514.6

LVDT transmitter XCBSQ-02/50-01-22

LVDT transmitter XCBSQ-02/250-01-00

Eddy Current Sensor PR6424/100-121

Pressure Differential Switch 12NN-EE5-N4-C2A

Sensor DF312580-90-08-02

Power supply HSDS-30/D

thermocouple WZPK2-333

Thermal expansion monitor DF9032

Sensor DF312580-90-10-00

Hydrogen leakage detection transmitter LH1500-C

LVDT Sensor 3000TDGN-25-01

Bearing Vibration Probe 9200-01-05-10-00

Expanda Cable Coil for soot blower IK-530

Pressure Switch 9B3-K5-M4-C1A-BB-CL-TT-YY

boiler thermal coupler TC03A2-KY-2B/S19

proximity price CWY-DO-811102

Turbine pump on-site speed sensor CS-I-D-065-05-01

 

Sealing subssembly for double color gauge 0019 BMA.T.BBK.G

Seal Oil Pressure Switch 6SC-KK5-N4-C2A

LVDT DEA-LVDT-150-3

Hall Current Sensor HEC 75-A3(A4, ±12)

Switch(YELLOW) ABFS201NY

thermal interface resistance WZP2MA

High Speed Bus Power Transfer System MFC2000-3A

RTD sensor WZP-230 Pt100

HRC Fuse Link for VCF breaker IEC 60282-1, 100 A

Sensor DF310880-50-08-02

LVDT Sensor FRD.WJA2-301H

speed sensor UKCSG-01-075-05-01-03-01

Axis vibration module DF2062

lvdt displacement transducer HTD-50-6

tachometer sensor working principle CS-1 G-100-02-01

TEXT DISPLAYER FD101

Temperature Transmitter JM-B-T010-562D2

Position switch 328A7435P001

Turbine TSI speed card DF2018

Eddy Current Sensor PR6422/103-111

Level gauge UHZ-10 C01N

Eddy Current Sensor PR6426/010-121

lvdt linear variable displacement transducer 5000TD-15-01-01

linear differential sensor (Linear variable differential transformer) of valve ICV 4000TDZ-A

Handle for LOTO OHBS2RJ

Current transducer WBI414S01

thermocouple WRNR-010

Input and output module 140DAJ74000

Sensor DF310030-40-00-01-00

Pressure Transmitters 3051GP4A2B21AHR5

Sensor DF310880-50-04-00

Ultrasonic Level Transmitter MPM626W6E22C3

FTV Actuator YF-A18-5A-2-15

Battery Holder Storage Box with Gold Plated Phosphor Bronze Pins 2x18650

transducer for displacement measurement DET400A

LVDT Sensor B151.36.09.G17

DC AUXILIARY RELAY JT3-12

Turbine pump on-site speed sensor CS-I-D-065-05-01

 

MY-DFYL-2025-3-4