SAMPLE TRANSFORMER/RECTIFIER FLEET CONDITION ASSESSMENT. for. NWL Transformers. January 4, Written by:

Transcription

1 TRNSORMR/RTIIR LT ONITION SSSSMNT for NWL Transformers January 4, 2010 Written by: Norman ield Senior ngineer Weidmann iagnostic Solutions

2 XUTIV SUMMRY Transformer/Rectifier leet ondition ssessment was performed for a fleet of 64 lectrostatic Precipitator (SP) Transformer/Rectifiers (T/Rs), operated by Progress nergy at the Roxboro Power Plant in Roxboro, N. This project evaluated the selected fleet of transformer/rectifiers in terms of their condition as interpreted from studying their insulating oil test results. ll 64 T/Rs belonged to Unit 4 SPs at the Roxboro Plant. Specifically, there are eight SPs (namely 41, 42, 43,,,,, and ) each being supplied power from eight T/Rs (designated through ), totalling sixty-four T/Rs. The transformer/rectifier condition assessment included a review of dissolved gas-in-oil analyses and general oil quality tests, from two points in time. One set of test results were from oil samples taken on 11/6/2009 and tested by the Weidmann iagnostic Solutions lab in ensalem, P. second set of test results were from 9/13/2007 and tested by the Progress nergy oil lab at the Roxboro Plant. Using this information, an lectrostatic Precipitator Transformer/Rectifier Oil nalysis and iagnostic valuation report was created for each T/R (copies provided herein). ach report provided diagnostic statements regarding the condition of the T/R, and summarized this condition by producing a condition code of either Normal, aution, or Warning. summary of the condition codes for each T/R, sorted by severity, is provided herein. It is important to note that the iagnostic valuation of each T/R took into account not only the results of the most recent oil tests for the samples taken on 11/6/2009, but also the results of the older oil tests for the samples taken on 9/13/2007. This was accomplished by using the dissolved gas-in-oil analysis results from both dates to calculate a rate of change (in parts-per-million per month) for each of the combustible gasses. While knowing the actual gas concentrations in the oil at a given point in time is informative, it is the rate of change of these gas concentrations over time that allow interpretation to be made as to whether there is an active problem inside the T/R or not. Weidmann iagnostic Solutions Page 1

3 SUMMRY O RSULTS The following pages of this section show two tables. The first is a listing of all 64 T/Rs sorted by their designation code (for example, 41 ) and shows the corresponding ondition ode and comments about the condition. The second table is the same list but sorted by ondition ode and then by severity of gassing, for ease of identification of the T/Rs with poorest condition. Weidmann iagnostic Solutions Page 2

4 Table 1: T/Rs sorted by esignation ode T/R ondition ode omments 41 Normal Resample oil in 6 months. 41 aution Resample oil in 3 months. igh gas concentration. 41 aution Resample oil in 3 months. igh gas concentration. 41 Normal Resample oil in 6 months. 41 Normal Resample oil in 6 months. 41 Normal Resample oil in 6 months. 41 Warning onsider internal inspection. Resample oil in 1 month. Very high gas concentration. bnormal gas increase. 41 Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. 42 aution Resample oil in 3 months. Very high gas concentration. 42 aution Resample oil in 3 months. igh gas concentration. 42 aution Resample oil in 3 months. igh gas concentration. 43 Normal Resample oil in 6 months. 43 aution Resample oil in 3 months. Very high gas concentration. 43 aution Resample oil in 3 months. igh gas concentration. ielectric breakdown strength low. 43 aution Resample oil in 3 months. igh gas concentration. 43 aution Resample oil in 3 months. Moisture very excessive. ielectric breakdown strength very low. 43 aution Resample oil in 3 months. Very high gas concentration. Moisture excessive. 43 Normal Resample oil in 6 months. 43 Warning onsider internal inspection. Resample oil in 1 month. Very high gas concentration. bnormal gas increase. Moisture very excessive. Interfacial tension low. ielectric breakdown strength low. cid high. aution Resample oil in 3 months. igh gas concentration. Normal Resample oil in 6 months. Weidmann iagnostic Solutions Page 3

5 T/R ondition ode omments aution Resample oil in 3 months. Moisture very excessive. ielectric breakdown strength low. Normal Resample oil in 6 months. Normal Resample oil in 6 months. aution Resample oil in 3 months. Moisture very excessive. Normal Resample oil in 6 months. aution Resample oil in 3 months. Moisture very excessive. Interfacial tension low. Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. aution Resample oil in 3 months. Interfacial tension very low. Warning onsider internal inspection. Resample oil in 1 month. Very high gas concentration. igh gas increase. Normal Resample oil in 6 months. aution Resample oil in 3 months. igh gas concentration. Normal Resample oil in 6 months. Normal Resample oil in 6 months. aution Resample oil in 3 months. igh gas concentration. Normal Resample oil in 6 months. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. Very high gas concentration. aution Resample oil in 3 months. igh gas concentration. Normal Resample oil in 6 months. Normal Resample oil in 6 months. aution Resample oil in 3 months. igh gas concentration. Warning onsider internal inspection. Resample oil in 1 month. Very high gas concentration. bnormal gas increase. Strong indication of overheating. autiion Resample oil in 3 months. igh gas concentration. Moisture very excessive. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. Normal Resample oil in 6 months. aution Resample oil in 3 months. igh gas concentration. Weidmann iagnostic Solutions Page 4

6 T/R ondition ode omments Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. aution Resample oil in 3 months. Very high gas concentration. aution Resample oil in 3 months. igh gas concentration. Moisture excessive. aution Resample oil in 3 months. Moisture very excessive. ielectric breakdwon strength low. aution Resample oil in 3 months. igh gas concentration. Moisture very excessive. ielectric breakdown strength low. Weidmann iagnostic Solutions Page 5

7 Table 2: T/Rs sorted by ondition ode and Severity of assing T/R ondition ode omments Warning onsider internal inspection. Resample oil in 1 month. Possible internal arcing activity. Very high gas concentration. igh gas increase. 43 Warning onsider internal inspection. Resample oil in 1 month. Possible arcing activity. Very high gas concentration. bnormal gas increase. Moisture very excessive. Interfacial tension low. ielectric breakdown strength low. cid high. 41 Warning onsider internal inspection. Resample oil in 1 month. Possible arcing activity. Very high gas concentration. bnormal gas increase. Warning onsider internal inspection. Resample oil in 1 month. Very high gas concentration. bnormal gas increase. Strong indication of overheating. aution Resample oil in 3 months. Very high gas concentration. 43 aution Resample oil in 3 months. Very high gas concentration. Moisture excessive. 43 aution Resample oil in 3 months. Very high gas concentration. 42 aution Resample oil in 3 months. Very high gas concentration. aution Resample oil in 3 months. Very high gas concentration. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. 43 aution Resample oil in 3 months. igh gas concentration. ielectric breakdown strength low. 43 aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. Weidmann iagnostic Solutions Page 6

8 T/R ondition ode omments aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. Moisture very excessive. ielectric breakdown strength low. 42 aution Resample oil in 3 months. igh gas concentration. 41 aution Resample oil in 3 months. igh gas concentration. autiion Resample oil in 3 months. igh gas concentration. Moisture very excessive. aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. 41 aution Resample oil in 3 months. igh gas concentration. aution Resample oil in 3 months. igh gas concentration. Moisture excessive. aution Resample oil in 3 months. Moisture very excessive. ielectric breakdown strength low. 43 aution Resample oil in 3 months. Moisture very excessive. ielectric breakdown strength very low. aution Resample oil in 3 months. Interfacial tension very low. aution Resample oil in 3 months. Moisture very excessive. aution Resample oil in 3 months. Moisture very excessive. Interfacial tension low. aution Resample oil in 3 months. Moisture very excessive. ielectric breakdwon strength low. 42 aution Resample oil in 3 months. igh gas concentration. Normal Resample oil in 6 months. Normal Resample oil in 6 months. 41 Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. 43 Normal Resample oil in 6 months. 41 Normal Resample oil in 6 months. Normal Resample oil in 6 months. 43 Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. Weidmann iagnostic Solutions Page 7

9 T/R ondition ode omments Normal Resample oil in 6 months. 41 Normal Resample oil in 6 months. 41 Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. 41 Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. 42 Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. Normal Resample oil in 6 months. Weidmann iagnostic Solutions Page 8

10 pictorial representation of the ondition odes for each T/R, grouped by their corresponding precipitator, follows. red color represents a Warning condition code, yellow a aution condition code, and green a Normal condition code Weidmann iagnostic Solutions Page 9

11 Weidmann iagnostic Solutions Page 10

12 ONLUSIONS Out of the sixty-four T/Rs, four had a ondition ode of Warning as of 11/6/2009. These four T/Rs were given this condition assessment due to their severity of gas concentrations and active gassing rates. It is highly recommended to immediately resample the oil from these T/Rs for updated and OQ testing. Internal inspection of these T/Rs should also be seriously considered. nother thirty T/Rs received a ondition ode of aution. While these T/Rs did not have sufficiently high gassing rates to be classified as Warning, they did have higher than normal gas concentrations in most cases. In a few cases, the T/Rs were given a aution designation due to their poor OQ test results, and not as a result of the figures. It is recommended that the oil from these thirty T/Rs is resampled within three months from the previous sampling for updated and OQ testing. final thirty T/Rs received a ondition ode of Normal. These T/Rs did not have high gassing rates nor did they have higher than normal gas concentrations, nor oil quality problems. It is recommended that the oil from these thirty T/Rs is resampled within six months from the previous sampling for updated and OQ testing. Weidmann iagnostic Solutions Page 11

13 WIMNN INOSTI SOLUTIONS 3580 PRORSSIV RIV, SUIT K1 + NSLM, P LTROSTTI PRIPITTOR TRNSORMR/RTIIR Oil nalysis & iagnostic valuation NWL Transformers Location: Progress nergy Plant Mfr.: eneral lectric ccount No.: Rising Sun Road Serial No.: 41 ustomer I: - ordentown, NJ ank / Phase: - Year: - Order No.: LT ompartment: Transformer/Rectifier ontrol No.: reathing Type: Sealed ate Received: 11/9/2009 TTN: Joe Koszyk luid: Mineral Oil Sample ontainer I: ate Reported: 12/14/2009 PO No.: S allons: - Project I: - STM Lab ontrol Number: ate Sampled: 11/6/2009 9/13/2007 WS Report Number: Report Oil Temp. (): - - ydrogen (2) (ppm): 0 10 Methane (4) (ppm): 1 5 thane (26) (ppm): 0 5 thylene (24) (ppm): cetylene (22) (ppm): 0 0 arbon Monoxide (O) (ppm): arbon ioxide (O2) (ppm): Nitrogen (N2) (ppm): Oxygen (O2) (ppm): Total issolved as (ppm): Total issolved ombustible as (ppm): quivalent eadspace T (%): STM Moisture In Oil (ppm): STM -971 Interfacial Tension (dynes/cm): STM -974 cid Number (mg KO/g): STM olor Number (Relative): STM Visual xam (Relative): LR&SPRK - STM Sediment xam (Relative): N - STM ielectric reakdown at 1mm (kv): 38 - ondition ode as of 11/06/2009: Recommended ction: Rate of hange nalysis: issolved-as oncentration nalysis: issolved-as Ratio nalysis: Physical valuation: Normal Resample oil within 6 months. ll relevant gas concentrations are stable. ll gasses within normal limits. Ratio calculations not necessary. Moisture content acceptable. IT acceptable. ielectric reakdown Strength acceptable. Oil clear and sparkling. The analyses, opinions or interpretations contained in this report are based upon material and information supplied by the client. Weidmann iagnostic Solutions does not imply that the contents of the sample received by this laboratory are the same as all such material in the environment from which the sample was taken. Our test results relate only to the sample or samples tested. ny interpretations or opinions expressed represent the best judgement of Weidmann iagnostic Solutions. Weidmann iagnostic Solutions assumes no responsibility and makes no warranty or representation, expressed or implied, as to the condition, productivity or proper operation of any equipment or other property for which this report may be used or relied upon for any reason whatsoever.

14 WIMNN INOSTI SOLUTIONS 3580 PRORSSIV RIV, SUIT K1 + NSLM, P LTROSTTI PRIPITTOR TRNSORMR/RTIIR Oil nalysis & iagnostic valuation NWL Transformers Location: Progress nergy Plant Mfr.: eneral lectric ccount No.: Rising Sun Road Serial No.: 41 ustomer I: - ordentown, NJ ank / Phase: - Year: - Order No.: LT ompartment: Transformer/Rectifier ontrol No.: reathing Type: Sealed ate Received: 11/9/2009 TTN: Joe Koszyk luid: Mineral Oil Sample ontainer I: ate Reported: 12/14/2009 PO No.: S allons: - Project I: - STM Lab ontrol Number: ate Sampled: 11/6/2009 9/13/2007 WS Report Number: Report Oil Temp. (): - - ydrogen (2) (ppm): 3 10 Methane (4) (ppm): 3 5 thane (26) (ppm): 0 5 thylene (24) (ppm): cetylene (22) (ppm): 0 0 arbon Monoxide (O) (ppm): arbon ioxide (O2) (ppm): Nitrogen (N2) (ppm): Oxygen (O2) (ppm): Total issolved as (ppm): Total issolved ombustible as (ppm): quivalent eadspace T (%): STM Moisture In Oil (ppm): STM -971 Interfacial Tension (dynes/cm): STM -974 cid Number (mg KO/g): STM olor Number (Relative): STM Visual xam (Relative): LR&SPRK - STM Sediment xam (Relative): N - STM ielectric reakdown at 1mm (kv): 41 - ondition ode as of 11/06/2009: Recommended ction: Rate of hange nalysis: issolved-as oncentration nalysis: issolved-as Ratio nalysis: Physical valuation: UTION Resample oil within 3 months. ll relevant gas concentrations are stable. t least one gas exceeds normal limits. Ratio analysis not used due to overall low gas quantities. Moisture content acceptable. IT acceptable. ielectric reakdown Strength acceptable. Oil clear and sparkling. The analyses, opinions or interpretations contained in this report are based upon material and information supplied by the client. Weidmann iagnostic Solutions does not imply that the contents of the sample received by this laboratory are the same as all such material in the environment from which the sample was taken. Our test results relate only to the sample or samples tested. ny interpretations or opinions expressed represent the best judgement of Weidmann iagnostic Solutions. Weidmann iagnostic Solutions assumes no responsibility and makes no warranty or representation, expressed or implied, as to the condition, productivity or proper operation of any equipment or other property for which this report may be used or relied upon for any reason whatsoever.

15 WIMNN INOSTI SOLUTIONS 3580 PRORSSIV RIV, SUIT K1 + NSLM, P LTROSTTI PRIPITTOR TRNSORMR/RTIIR Oil nalysis & iagnostic valuation NWL Transformers Location: Progress nergy Plant Mfr.: eneral lectric ccount No.: Rising Sun Road Serial No.: 41 ustomer I: - ordentown, NJ ank / Phase: - Year: - Order No.: LT ompartment: Transformer/Rectifier ontrol No.: reathing Type: Sealed ate Received: 11/9/2009 TTN: Joe Koszyk luid: Mineral Oil Sample ontainer I: ate Reported: 12/14/2009 PO No.: S allons: - Project I: - STM Lab ontrol Number: ate Sampled: 11/6/2009 9/13/2007 WS Report Number: Report Oil Temp. (): - - ydrogen (2) (ppm): Methane (4) (ppm): thane (26) (ppm): thylene (24) (ppm): cetylene (22) (ppm): 2 3 arbon Monoxide (O) (ppm): arbon ioxide (O2) (ppm): Nitrogen (N2) (ppm): Oxygen (O2) (ppm): Total issolved as (ppm): Total issolved ombustible as (ppm): quivalent eadspace T (%): STM Moisture In Oil (ppm): 8 39 STM -971 Interfacial Tension (dynes/cm): STM -974 cid Number (mg KO/g): STM olor Number (Relative): STM Visual xam (Relative): LR&SPRK - STM Sediment xam (Relative): N - STM ielectric reakdown at 1mm (kv): 46 - ondition ode as of 11/06/2009: WRNIN Recommended ction: onsider internal inspection of Transformer/Rectifier. Resample oil within 1 month. Rate of hange nalysis: t least one gas has an abnormal rate of increase. issolved-as oncentration nalysis: t least one gas far exceeds normal limits. issolved-as Ratio nalysis: Indication of high temperature overheating. Physical valuation: Moisture content acceptable. IT acceptable. ielectric reakdown Strength acceptable. Oil clear and sparkling. The analyses, opinions or interpretations contained in this report are based upon material and information supplied by the client. Weidmann iagnostic Solutions does not imply that the contents of the sample received by this laboratory are the same as all such material in the environment from which the sample was taken. Our test results relate only to the sample or samples tested. ny interpretations or opinions expressed represent the best judgement of Weidmann iagnostic Solutions. Weidmann iagnostic Solutions assumes no responsibility and makes no warranty or representation, expressed or implied, as to the condition, productivity or proper operation of any equipment or other property for which this report may be used or relied upon for any reason whatsoever.