Pomona

General Purpose Passive Oscilloscope Probes Models 4550B, 5795A, 5800A, 5803A, 5806A, 5827A, 6049A, 6069A, 6265, 6266, SP150B
FEATURES: Pomonas latest design of Passive Oscilloscope probes feature a one piece (monolithic) design for robust probe life. Probe bandwidth ratings are specified as a system bandwidth. System bandwidth includes both probe and oscilloscope together as a system. The result is a probe frequency response that can essentially can be considered transparent. For ease of use, Readout Actuator for probe attenuation sensing and a Ground Reference switch are featured on some probe models. Full set a accessories are included with each probe. All probes meet IEC1010-2-031, 300V, CAT I
Model #: Attention: System Bandwidth (3dB) MHz.: 15/20/60 20/60 15/150 System Risetime ns 23.33/3.5 3.5 11.66 1.75 17.5/1.75 1.75 2.33 1.75 5.83 17.5/5.83 23.33/2.33 Compensation Range (pf.): 10-60 10-60 N/A 10-60 10-60 15-50 10-30 10-30 10-60 10-60 10-60 Voltage Max. (Note 2) 300 Input Res. (M ) 1/1/10 1/10 1/10 Input Cap. (pf.): 64/10.5 9.10 77/11.5 5.5 10.10.5 65/11 50/15 Readout Actuator Pin: Gnd. Ref.: X
4550B 5795A 5800A 5803A 5806A 5827A 6049A 6069A SP150B
X1/X10 X10 X1 X10 X1/X10 X100 X10 X10 X10 X1/X10 X1/X10
1.) Measurements based on 1M Ohm, 20 pf. Oscilloscope.
All dimensions are in inches. Tolerances (except noted):.xx =.02 (,51 mm),.xxx = .005 (,127 mm). All specifications are to the latest revisions. Specifications are subject to change without notice. Registered trademarks are the property of their respective companies. Made in USA

6/9/99 SY/EH/LS

Sales: 800-490-2361 Fax: 888-403-3360 Technical Assistance: 800-241-2060
PomonaACCESS 90474 (800) 444-6785 or (425) 446-6010 More drawings available at www.pomonaelectronics.com

Page 1 of 6

S:\Engineering \Release\DataSheets\FlukeDataSheet\d4550B-SP150B_6_01.doc
2.) Maximum probe input voltage is limited to the lesser of 300VDC (includes AC peak to 1.3MHz.) or on X1, to the driven equipments input rating. * Oscilloscope Model # 5827 has a cable length of 2.0 Meters.

Model #:

Attention:

6101A 6102A

X10 X10
System Bandwidth (3dB) MHz.: 150 250
System Risetime ns 2.33 1.4
Compensation Range (pf.): 10-30 10-30
Voltage Max. (Note 2) 300 300

Input Res. (M ) 10 10

Input Cap. (pf.): 10.5 10
Readout Actuator Pin: X X

Gnd. Ref.:

5809A 5812A
System Bandwidth (3dB) MHz.: 300 300
System Risetime ns 1.17 1.17
Compensation Range (pf.): 10-60 10-60

Input Cap. (pf.): 17 17

Readout Actuator Pin: X
1.) Measurements based on 1M Ohm, 20 pf. Oscilloscope. 2.) Maximum probe input voltage is limited to the lesser of 300VDC (includes AC peak to 1.3MHz.) or on X1, to the driven equipments input rating.

Page 2 of 6

Low Frequency Trimmer Adjustment: (Model 5800A is not adjustable) Low frequency response can be matched to the oscilloscope by adjusting the compensation trimmer on the head of the probe. 1.) Connect the probe to the oscilloscope and to a 1 KHz. Square wave source, the rise time should not exceed 10 microseconds (most oscilloscopes provide a probe compensation output). For X1/X10 probes, switch to the X10 position. 2.) Set the oscilloscope to display two to three cycles and two to six vertical divisions. 3.) Carefully adjust the trimmer tool to obtain the flattest tops to the square waves displayed on the oscilloscope, see illustrations.

High Frequency Trimmer Adjustment: (Models 5809A and 5812A only) The high frequency compensation has been preadjusted at the factory, however if adjustment is required, use the following procedure. 1.) Remove the compensation box cover located near the connector. Using the BNC adapter, connect the probe to a square wave generator operating between 10 to 100 KHz terminated into 50 ohms. The square wave generator rise time should be approximately.125 ns. Adjust each control until the leading edge of the waveform is as flat, square and horizontal as possible (see high frequency illustrations). 2.) Readjust the low frequency compensation if necessary.

Page 3 of 6

Replacement Accessory Kit Part Number: 6267
Pomona Oscilloscope to Probe Cross Reference:
Manf. B&K B&K B&K B&K B&K B&K B&K B&K Fluke Fluke Fluke Fluke Fluke Fluke Fluke Fluke Fluke Fluke Fluke Fluke Fluke Model Series 1422, 1443 2120, 2125, 2522 5020, 5024, 5034 5100, 1541B 90, 105 Series PM3050, PM3052 PM3055, PM3057 PM3065, PM3067 PM3070, PM3072 PM3092, PM33094 PM3208, PM3209 PM3335, PM3337 PM3350A, PM3352A PM3355, PM3357 PM3365A, PM3367A PM3375, PM3377 PM3382, PM3384 x1 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A x10 x1/x10 x6266 5827A 5827A 5795A 4550B 5827A 5827A 5827A 5795A 4550B 5827A 6049A SP150B 5827A 5827A 6006* & 6033 6035* 5827A 5827A 5795A 4550B 5827A 5795A 4550B 5827A 5803A 5806A 5827A 5827A 5827A 5827A 5827A 5795A 4550B 5827A 5795A 4550B 5827A 5795A 4550B 5827A

Page 4 of 6

PM3392, PM3394 V-1060, V-1065A V-1100A V-1150 V-209, V-212 V-222, V-223, V-225 V-422 V-509, V-522 V-523, V-525 V-6155 V-660, V-665A VC-5025 VC-5410, VC-5430 VC-5460 VC-6023, VC-6024 VC-6025A VC-6045, VC-6045A VC-6155 VC-7102, VC-7104 54600B, 54601B 54602B 54603B 54645A, 54645D SS-7811, SS-7821 COR5500U, COR5501U COR5502U COR5520U, COR5521U COR5540U, COR5541U COR5560U, COR5561U 2250 8020, 8060, 8063 8060, 8063 8100, 8101, 8103, 8104 3060D 3100A 313A, 315A, 323A, 325A LBO-5825 9304A,9340AM 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5800A 5803A 5795A 5795A 6049A 6265 5795A 6265 6049A 5795A 5795A 6049A 5795A 6049A 6265 5795A 5795A 5795A 5795A 6265 5795A 6265 6069A 5795A 6265 5795A 5803A 5806A 4550B 4550B SP150B 6266 4550B 6266 SP150B 4550B 4550B SP150B 4550B SP150B 6266 4550B 4550B 4550B 4550B 6266 4550B 6266 4550B 6266 4550B 5806A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A 5827A

Recent Trends in Ultralarge-capacity Three-phase Transformer Technology
Naoki Amano Kenichi Kawamura Masakazu Yokoyama Hiroaki Kojima, Dr. Eng. OVERVIEW: Large capacity transformers have evolved to meet the changing needs of electric power companies. For example, the need to reduce the transportation cost to the site and the trend towards smaller installation spaces have led to the introduction of on-site assembly technology. In addition, plans to double the voltage rating will increase considering future long-distance transmission, and the need for a routine supervisory system will grow as transformer operating conditions become severe due to extended operating life of equipment, overload operation, etc. Hitachi is meeting these needs with its computer analysis technology and verification testing using trial production. The result of our efforts is highly efficient large capacity transformers. In particular, we have just completed delivery of a 281.25-kV (525-kV) 1,060-MVA double-rating voltage transformer for the Hitachinaka Power Station of Tokyo Electric Power Co., Inc., as well as Hitachis firstever on-site assembly of transformers (500 kV 1,000 MVA) for the Chizu Substation of the Chugoku Electric Power Co., Inc. Hitachi uses the newest diagnostic technology for its apparatus supervisory system and provides rational maintenance and support. extension of the operating voltage range for the future long-distance transmission. Moreover, there are transportation restrictions especially regarding substations in mountainous areas, etc., for which the introduction of an on-site assembly system is seen as a solution to this problem while also minimizing
INTRODUCTION THE market for large capacity transformers is highly dependent on the needs of the electric power companies to which they are supplied. Consequently, with cost-effectiveness as the driving concern there has been a doubling of the voltage specification and
Fig. 1View of Shop Test of 281.25kV (525-kV) 1,060-MVA Double Rating Voltage Transformer. The shop test would be carried out by using test bushings, although the secondary side was connected with power cable. The test was first carried out in the 525-kV connection state and was repeated after changing to the 281.25-kV connection.
Hitachi Review Vol. 51 (2002), No. 5
installation space. Of equal importance is the need for stable operation over long period. Thus preventive maintenance is a necessary aspect of controlling the investment in the equipment. This paper reviews Hitachis efforts to meet the challenges described above. In particular, we discuss our 281.25-kV(525kV) 1,060-MVA double-rating voltage transformer for power stations and our 500-kV 1,000-MVA siteassembled transformer for substations. We also discuss the latest apparatus supervisory system we provide, which can support preventive maintenance systems. HISTORY OF HITACHIS LARGE-CAPACITY TRANSFORMERS The historical trend in Hitachis transformer technology is shown in Fig. 2. Hitachi established 500kV transformer insulation design technology in the 1970s. This eventually led to a UHV (ultra-high voltage) insulation design technology, and to a practical UHV transformer in 1993. Moreover, the evolution of computer analysis technology has led to significant efficiencies. For instance, the optimum core design can be found by magnetic flux distribution
analysis and a high-accuracy stray loss evaluation is also possible through detailed magnetic field analyses. The result is the present low-noise, high-efficiency transformer technology. Development of a doublerating voltage transformer started with the 250-/154(77-)/22-kV 300-MVA transformer in 1973. Larger capacity ones, the 225-kV (520-kV) 730-MVA transformer and 220-kV (500-kV) 250-MVA transformer, were supplied in 1994 for the Reihoku Power Station of Kyushu Electric Power Co., Inc. Onsite assembled transformers for substation began in 1989 with the 220-kV 250-MVA site-assembly transformer. The technique used in 1989 is similar to the present one. The 500-kV 1,000-MVA siteassembled transformer was completed in 2000. LARGE CAPACITY DOUBLE-RATING VOLTAGE TRANSFORMER Specification The specification of a double-rating voltage transformer for the Hitachinaka Power Station of the Tokyo Electric Power Co., Inc. is shown in Table 1. The feature of this transformer is that capacity is
Establishment of computer analysis technology and improvement of accuracy

Application of 500-kV transformer technology Down sizing
Design rationalization by using computer and CAD
Rationalization by using 3D-CAD
Establishment Application of 2nd UHV Low loss 500-kV site-assembled of high-impedance and down development technology technology technology sizing possible by application of new materials Completion of large capacity Multi-duct insulation Hybrid insulation Permittivity DC insulation double rating voltage transformer matching technology Solution of electrification phenomenon problem insulation Insulation harmony and resonance analysis CC Shield technology by EMTP Gradient capacitance interleaved winding Hitachi self-bonded TRW Accumulation of lightning data Ultra-large core Large capacity non-divided winding Establishment of low loss structure and subsequent improvement to it Ultra-low-noise structure, 4050 dB Establishment of on-site assembly
CC: condenser coupling TRW: transposed rectangular wire EMPT: electro-magnetic transients program

Reduction of stray loss

Development of high efficiency noise insulating panel
Technology area Specific technologies
Fig. 2Historical Trend in Hitachis Large-capacity Transformer Technology. Hitachi has developed high-reliability transformers by accumulating test data from trial productions and applying computer analysis that has evolved over time.
TABLE 1. Specification of 281.25-kV (525 kV) 1,060-MVA Transformer The short-circuit impedances under both operating voltages are equal.
Item Type Capacity Voltage Frequency Connection Specification Three-phase ODAF 1,060 MVA Primary: 18.525 kV Secondary: F287.5-R281.25-F275 kV (F550-F537.5-R525-F512.5 kV) 50 Hz Primary: Delta Secondary: Star Primary: AC 50 kV LI 150 kV Secondary: AC 330 kV LI 950 kV (AC 635 kV LI 1,300 kV ) 14% (both 281.25-kV and 525-kV connections) T a p H V 2 L V T a p H V 2 L V

Distributed current

(a) 281.25-kV connection Internal connection point
Insulation level Impedance
ODAF: direct oil forced-air cooled type LI [LIWL: lightning impulse withstand level]
maximized as the double-rating voltage transformer and moreover the short-circuit impedances under both operating voltages (281.25 kV and 525 kV) are equal. Structure The high voltage winding consists of two windings. Two high-voltage windings are used in parallel for the 281.25-kV connection and are used in series for the 525-kV connection. By changing the internal lead line, the connection can be changed. The composition of the windings is shown in Fig. 3.
HV: high-voltage winding LV: low-voltage winding

(b) 525-kV connection

Fig. 3Winding Arrangement of Double Rating Voltage Transformer. The high-voltage windings are used in parallel for the 281.25kV connection and in series for the 525-kV connection.

The three-phase five-legs core of the conventional large capacity transformer was adopted. The optimum joint structure was used to ensure the magnetic flux would be uniform and the local loss would not become concentrated. The cross-sectional ratio of the up-anddown yoke and side yoke was also optimized.

Winding

between each high-voltage winding and the lowvoltage winding would be almost equal. To design the insulation of the high-voltage windings, the generating voltages between coils and an internal connection point were analyzed using EMTP (electro-magnetic transients program). The EMTP analysis was carried out not only for standard waves but also for long-tail waves, and attenuation oscillating waves. A lowvoltage helical winding consisting of many parallel transposed rectangular wires was adopted, and it was designed to control circulating current by using the optimum transposition method.

Reliability Verification

The windings are arranged in the order of tap winding, high-voltage winding 2, low-voltage winding, and high-voltage winding 1 from the inner side. In order to make the short-circuit impedance the same for both operating voltages, the current distribution needs to be made the same. For the parallel 281.25kV connection of the high-voltage winding 1 and 2, the low-voltage windings among the high-voltage windings 1 and 2 are connected so that current distribution ratio can be about 50%. Furthermore, analysis of the main gaps ensured that the impedance
To verify the reliability of the transformer, the current distribution ratio of the two high-voltage windings and the voltage distribution characteristics of the windings in air against low-voltage surge were checked in the manufacturing stage. It was found that there were no problems regarding performance. In the shop test, the connection was changed after the test for the 525-kV connection and the test for the 281.25kV connection was carried out. Good results were obtained for both connection states.

as one unit. Windings were covered with film to prevent them from absorbing moisture and protect them against dust. The number of divisions of the tank was determined taking into account the transportation restriction of a low floor trailer. A low-mounted tank simplifies assembly of the core and reduces the force of lifting. It also simplifies the core assembly work that has to be done on site (see Table 2). Transportation Test Prior to full-scale manufacture of the 500-kV 1,000MVA transformer, trial production of the 500-kV 1,000/3-MVA transformer was carried out. To determine the optimum safe division of the winding and core, a run test, bad-road test, sudden blast-off and sudden braking test with a vehicle acceleration of more than 29.4 m/s2 were carried out, and a fall test using a wrecker was also carried out. These tests showed that the units would remain undamaged in typical mishaps. Moreover, an electrical characteristic test was carried out before and after the transportation test, and it showed that there was no change in characteristics. The transportation test is shown in Fig. 5. Tests carried out after transportation and assembly revealed no differences compared with electrical characteristics measured before transportation. PREVENTIVE MAINTENANCE SYSTEM Preventive maintenance for the substation can be enhanced with the supervisory equipment for oil level, oil temperature, diagnosis of unusual events, etc. An example is the operation supervisory technology of the on-load tap changer, which is much more troublesome than other transformer parts.
Fig. 4500-kV 1,000-MVA Site-assembled Transformer for the Chizu Substation of the Chugoku Electric Power Co., Inc. The first-ever on-site assembly of a 500-kV transformer for Hitachi.
500-KV SITE-ASSEMBLED TRANSFORMER Completion Hitachis first-ever on-site assembly of a 500-kV transformer (500 kV 1,000-MVA) was done at the Chizu Substation of the Chugoku Electric Power Co., Inc. in 2000 (see Fig. 4). Transportation costs have been reduced, and also, installation space could be reduced to about 50 to 60% compared with three units of the conventional single-phase transformer. Main Features of On-site Assembly Technology The main features of the technology applied to the 500-kV site-assembled transformer are as follows: (1) The main leg non-division method is adopted for the core. This minimized the transportation size and mass, without deteriorating the core characteristics (see Table 2). (2) All windings of the same core leg were transported
TABLE 2. Features of Site-assembled Transformer The optimum division method is adopted for each part.
Core division method Low-mounted tank serves as both a tank and a mount for the core Lowmounted Core tank Lifting
Main-leg non-division method Contents
Fig. 5Transportation Test. An electrical characteristic test was carried out before and after the transportation test.
Strain gage Four-arm bridge

Rotation side

Fixed side Induction source
Receiver Power source Indicator Demodulator Filter Output CPU
Transmitter Constantvoltage source FM transmitter Antenna loop Coaxial cable
AC 100 V RS232 Mode Telephone circuit

Converter

Transmitter
Fig. 6Measuring Driving Torque of On-load Tap Changer. Detecting fault phenomena and locating fault locations are possible.
Torque Supervisory System of On-load Tap Changer Hitachi has created supervisory equipment that can diagnose unusual states of the on-load tap changer at an early stage by detecting driving torque, operation time, motor current, etc. In the measurement system shown in Fig. 6, a torque sensor and a torque measurement value are transmitted to a distant central control room by using a telephone circuit. Locating the fault position in addition to detecting the fault phenomenon is also possible through accumulation of the transmitted torque data. Moreover, abnormalities originating in deformation of the tap changer drive system, jams between a shaft and bearings, and wear are detectable by analyzing the trend and pattern of the driving torque data. CONCLUSIONS A large-capacity double rating voltage transformer and a 500-kV site-assembled transformer were described as examples of transformers reflecting the latest needs of electric power companies. The need to control equipment investment is a serious concern for electric power companies. Hitachi is committed to improving the design, manufacture, and maintenance resume of our transformers, which we believe to meet our customer needs.

REFERENCES

(1) K. Maruyama et al., Preventive Maintenance Technology for Substations, Hitachi Hyoron 75, pp. 855-860 (Dec. 1993) in Japanese. (2) H. Sampei et al., Development of a Site-Assembly Transformer, Hitachi Hyoron 82, pp. 191-194 (Feb. 2000) in Japanese.

ABOUT THE AUTHORS

Naoki Amano
Joined Hitachi, Ltd. in 1977, and now works at the Transformer Department of Kokubu Engineering & Product Division in Japan AE Power Systems Corporation. He is currently engaged in the development of transformers. Mr. Amano is a member of the Institute of Electrical Engineers of Japan (IEEJ), the Japan Society of Mechanical Engineers (JSME) and the Institute of Electrical and Electronics Engineers, Inc. (IEEE), and he can be reached by e-mail at naoki_amano@pis.hitachi.co.jp.

Kenichi Kawamura

Joined Hitachi, Ltd. in 1994, and now works at the Transformer Department of Kokubu Engineering & Product Division in Japan AE Power Systems Corporation. He is currently engaged in the development of transformers. Mr. Kawamura is a member of the IEEJ, and can be reached by e-mail at kenichi-a_kawamura@pis.hitachi.co.jp.

Masakazu Yokoyama

Joined Hitachi, Ltd. in 1991, and now works at the Transformer Department of Kokubu Engineering & Product Division in Japan AE Power Systems Corporation. He is currently engaged in the development of transformers. Mr. Yokoyama can be reached by e-mail at masakazu_yokoyama@pis.hitachi.co.jp.

Hiroaki Kojima

Joined Hitachi, Ltd. in 1986, and now works at the 1st Department of Power & Industrial Systems R&D Laboratory, Power & Industrial Systems. He is currently engaged in research and development of transformers. Dr. Kojima is a member of the IEEJ, and can be reached by e-mail at hiroaki_kojima@pis.hitachi.co.jp.