Related Manuals for ABB PBA2
Summary of Contents for ABB PBA2
- Page 1 Bushing Potential Device,Type PBA2 PTAE-APD903 IZUA 7711-210 Instructions for Installation and Maintenance...
- Page 2 All possible contingencies which may arise during installation, operation, or maintenance, and all details and variations of this equipment do not purport to be covered by these instructions. If further information is desired by purchaser regarding his particular installation, operation or maintenance of his equipment, the local ABB Inc representative should be contacted.
- Page 3 Standardized mounting dimensions permit the interchangeability used to energize synchroscopes, voltmeters, and voltage with most standard ABB or Westinghouse units sold since responsive relays. The device accuracy is not adequate the middle of 1934. The standard device is electrically usable for use with metering instruments where revenue is involved.
- Page 4 See page 10 “Calculation of Approximate Adjustment.” Table 1 Performance System System Max. Watts* Device The Type PBA2 Potential Device is a Class”“A” device as Voltage Voltage Total Style** defined by AIEE Standard # 31 and NEMA Standards Line-To-Line Line-To-Ground Burden SG4-1968.
- Page 5 Erection 1. If the bushing is ABB O plus C or other type that permits addition of transformer oil to the test tap with The potential device may be lifted from its crate or pallet the tap cover in place, you may choose to fill the PBA and handled by means of the two lifting lugs on the side of connector housing with transformer oil.
- Page 6 (one reading about 150 volts, and the other about 5 volts) by connecting the ground of the reference The Type PBA2 is a ‘resonant’ or ‘in-phase’ device having and the ground of the device output together and then Class’“A”...
- Page 7 Figure 3: Connection Diagram For this adjustment the device must be connected to its shall be adjusted so that the total deflection in each the final condenser bushing, with normal line-to-ground voltage vertical and the horizontal directions is roughly the same. on the bushing stud, and with a reference voltage available The reference and the output voltages are in phase when for comparison.
- Page 8 Make up the circuit of Fig. 4 with the ground switch of the straight line trace on the oscilloscope. Start by first trying the device in the closed position, which de-energizes the device. larger steps (192 turns is the largest step) and if any step is in Place all of the rotary switches and the toggle switch of the excess of that required then drop back to the next lower turns phase angle adjustment in the zero position and set the...
- Page 9 Figure 5: Curve of Ohms versus Turns of Reactance...
- Page 10 Excessive transformer reactance (refer to Fig. 5) will result in When final adjustment is accomplished, with the burden a lagging voltage at the burden, and vice versa. connected, check voltage H2-H3. This voltage shall not exceed 172V. Voltage in excess of 172V indicates excess When a straight line is being approached on the oscilloscope, burden connected to the device and excess voltage on the output voltage shall be checked and readjusted to the...
- Page 11 Where e is the open circuit tap voltage in volts and E is the total turns are the same as that determined from the curve. actual system line-to-ground voltage at the condenser bushing. Figure 7: Nomograph for PBA2 Potential Device...
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Page 12: Application Notes
Constant K from empirical equation K = .95 + .078XC/ C3 scale and the C1 scale extending to the reference line. 100,000 but not less than 11. 4. Locate the system voltage, which the PBA2 device is Application Notes measuring on the line volts scale. -
Page 13: Auxiliary Winding
Figure 8: Transformer Tap and Ratio Chart bushing, a potential device and a burden. Therefore, Operating Tap Voltage since any one of these is not a perfect duplicate of any The primary of the device transformer is designed for other of its own kind, it is necessary to completely continuous operation at voltages not in excess of 7600 re-adjust when any one of the combination is changed. -
Page 14: Troubleshooting
Grounding 4. Recheck degree of power factor correction. Any one terminal of either the “S” winding or the “Z” 5. Calculate the approximate adjustment in line with winding of a device may be grounded (it is not necessary), sections on “Calculation of Approximate Adjustment” if desirable for the purposes of the connected burden. - Page 15 Notes...
- Page 16 TRADE, ARE MADE REGARDING THE INFORMATION, RECOMMENDATIONS, DESCRIPTIONS, AND SAFETY NOTATIONS CONTAINED HEREIN. IN NO EVENT WILL ABB INC. BE RESPONSIBLE TO THE USER IN CONTRACT, IN TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGE OR LOSS WHATSOEVER...