Patent SG-11201808504U-A (SG)
Title: Non-clamping method and apparatus for identification of dead underground power utility cable from spatially adjacent power utility cables
Inventor: WANG AIMIN
IPC: G01V3/11
Filed: 2017-04-05
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property -, Organization 11111111011110111010101111101011111011101011111110101110111011111101111011111 International Bureau ... ..... ..Yi j (10) International Publication Number ..... .„,,,, (43) International Publication Date WO 2017/176212 Al 12 October 2017(12.10.2017) WIPO I PCT (51) International Patent Classification: (81) Designated States (unless otherwise indicated, for every GO1R 31/02 (2006.01) GO1R 19/145 (2006.01) kind of national protection available): AE, AG, AL, AM, GO1V 3/11 (2006.01) AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, (21) International Application Number: DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, PCT/SG2017/050193 HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, (22) International Filing Date: KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, 5 April 2017 (05.04.2017) MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, (25) Filing Language: English RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, (26) Publication Language: English TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (30) Priority Data: 10201602767R 8 April 2016 (08.04.2016) SG (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, (71) Applicant: SINGAPORE POWER LIMITED [SG/SG]; GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, 10 Pasir Panjang Road, #03-01, Mapletree Business City, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, Singapore 117438 (SG). TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, (72) Inventors: WANG, Aimin; 10, Mapletree Business City, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, Pasir Panjang Road, #03-01, Singapore 117438 (SG). LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, S LEE, Kim Hoong Alvis; 10, Mapletree Business City, M, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, _ Pasir Panjang Road, #03-01, Singapore 117438 (SG). LI, GW, KM, ML, MR, NE, SN, TD, TG). — Hongqun; 10, Mapletree Business City, Pasir Panjang Published: — Road, #03-01, Singapore 117438 (SG). — with international search report (Art. 21(3)) — Agent: AMICA LAW LLC; 30 Raffles Place, #14-01 = (74) Chevron House, Singapore 048622 (SG). = = = (54) Title: NON-CLAMPING METHOD AND APPARATUS FOR IDENTIFICATION OF DEAD UNDERGROUND POWER CABLE FROM SPATIALLY ADJACENT POWER UTILITY CABLES UTILITY (57) : The present disclosure = = To 1,4 relates to non-clamping method and appar- ,--„, atus for identification of dead underground -= of ft ';' ''''\"• - power utility cable. The method comprises: 4 --- iL forming a complete circuit by connecting a = ft I transmitter to two of a plurality of conduct- , ors of a target dead power cable at a first = 1 I • • -, end thereof; short-circuiting and grounding the plurality of conductors at a second end of the dead power cable; injecting an audio = = _ .. ,,,,, .,. - ,,,,,,, frequency current signal from the transmit- = t ,,, .. — , ter into the complete circuit; within a pit :,-- R 'd i. which at least partially exposes a plurality rot . — I w of underground power cables: detecting a first audio frequency magnetic flux signal i on a surface of a random first one of the un- Il .4 1 4- Z derground power cables; detecting a second of audio frequency magnetic flux plurality I b' ei 1-1 IN 11 IN 11 0 G Figure 1A signal on respective surfaces of some of the underground power cables being spa- tially-adjacent to the first one of the under- ground power cables; identifying the first one of the underground power cables as the target dead power cable if a peak amplitude of the first audio frequency magnetic flux signal as displayed on a display device ex- el ceeds any peak amplitude of the second plurality of audio frequency magnetic flux signals as displayed on the display device by t I 1 more than about 50%.