WO2014027318A4

WO2014027318A4 - Meter testing device

Info

Publication number: WO2014027318A4
Application number: PCT/IB2013/056638
Authority: WO
Inventors: Vinay WADKE; Ajit Patil; Rajan KORAGAONKAR; Arvind RAI
Original assignee: Reliance Infrastructure Ltd.
Priority date: 2012-08-17
Filing date: 2013-08-14
Publication date: 2014-04-17
Also published as: WO2014027318A1

Abstract

The present invention provides a device and method for meter testing. The device comprising an optical sensor (5) connected with a meter to be tested; a pulse counter (1) connected with said optical sensor (5); a controller means having a comparator means (2) connected with said pulse counter (1); a standard meter pulse means (3) connected with said controller means providing standard meter pulses to said controller means; a meter constant means; an inbuilt phantom load (4) connected with CC of the said meter; a display means operatively connected with said controller means. When LED of meter to be tested starts blinking the pulses are sensed by optical sensor and associated pulse counter counts the pulses and these pulses are provided as input to the controller with standard meter pulses. Comparator compares both pulses and displays the error percentage on said display.

Claims

1 AMENDED CLAIMS received by the International Bureau on 3 February 2014 (03.02.2014).

1. A device for meter testing, said device comprising: at least one optical sensor connected with a meter to be tested; a pulse counter connected with said optical sensor; a controller means having a comparator means connected with said pulse counter; a standard meter pulse means connected with said controller means providing standard meter pulses to said controller means; a meter constant means; an inbuilt phantom load connected with CC of the said meter; a display means operatively connected with said controller means; and further an inbuilt memory chip for data storage wherein said sensor sensing the pulse of the meter provides input pulses to said pulse counter which in turn feeds the pulses to said controller means along with standard meter pulses; wherein said comparator means compares both the pulses and displays the error percentage on said display means.

2. The device as claimed in claim 1, wherein said comparator means adapted to logically compare the number of pulses obtained at the output of the pulse counter and the number of pulses given by the standard meter.

3. The device as claimed in claim 1 further comprising a current transducer connected to the standard meter output for load current sampling to be fed into the controller means. 2

4. The device as claimed in claim 1, wherein said meter constant means comprising providing a predetermined value for comparison of inputs received by the controller from the standard meter and the pulse counter.

5. The device as claimed in claim 1, wherein said device optionally connectable to a computer or a group of computers connected in a network.

6. The device as claimed in claim 1, wherein said device is adapted to be used for single phase applications.

7. The device as claimed in claim 6 is optionally adapted to be used for three phase meters using Phase Looping method.

8. The device as claimed in claim 1 further comprising an inbuilt thermal printer.

9. A method for meter testing by the said device as claimed in claim 1, wherein said method comprising; an inbuilt Phantom load being connected across a CC of a meter to be tested, sensing LED pulses of said meter by an optical sensor, determining said LED pulses of said meter by a pulse counter, comparing the said pulses with a standard meter pulses by a comparator and displaying the error percentage on a display means.

10. The method as claimed in claim 9, wherein said comparator means logically compares the number of pulses obtained at the output of the pulse counter and the number of pulses given by the standard meter.

11. The method as claimed in claim 9 further comprising sampling of load currents by means of current transducer connected to the standard meter output for feeding into the controller means. 3

12. The method as claimed in claim 9, wherein said comparison of inputs received by the controller from the standard meter and the pulse counter is performed with reference to a predetermined value provide by the meter constant means.

13. A device for meter testing substantially as herein described with reference to the accompanying drawings and the description.

14. A method for meter testing substantially as herein described with reference to the accompanying drawings and the description.

4

STATEMENT UNDER ARTICLE 19 (1 )

In regard to the findings of the ISA in the International Search Report and the Written Opinion with respect to the claims of the instant application, the applicant respectfully submits and amends the claims as discussed herein under.

Re Item V and VIII

Amendments:

Claim 1 has been amended by incorporating features of claim 5.

Subsequently, claim 5 has been deleted.

Claims have been renumbered.

The dependencies have been changed in the dependent claims. ,

It is respectfully submitted that US 4646003 (D1) as cited by the Examiner has already been acknowledged in the specification. It is respectfully submitted that the meter testing device as disclosed in US 4646003 uses Phantom loading transformer in the current loop which causes variable current to circulate resulting in poor thermal stability and makes the device bulky and therefore it is not possible to inbuilt the Phantom load. Further the use of photo pickup instead of photosensor makes the scanner attachment complicated and bulky and is also less accurate. For error calculations gate control and calculators are used which take more time as compared to the advanced embedded systems including microcontrollers. And as a result the overall testing period increases. US20030038621 (D2) does not teach use of an inbuilt Phantom load which is to be connected across the current terminal (CC) of the meter under test instead of customer load. KR2008/001017 does not teach use of an inbuilt Phantom load. It is submitted that XP032064323 and XP031843219 5

do not disclose inbuilt phantom load and the features of the present invention as discussed herein above.

The above mentioned points make the instrument bulky and less^" accurate. But the proposed invention discards all this drawbacks by using a reduced size Phantom Load with current transformer (a distinguishing feature) instead of the use of potential transformers (Loading Transformer). Further features like Internal Reference Watt-hour Meter for computing of reference energy and feeding same to comparator unit for further arithmetic calculation of pulses, External Optical port for sensing static watt hour meters pulse output 20X4 LCD Display for inputting MUT details and displaying % Error, Numerical keypad for user input and detail entry of MUT, thermal Printers and Ethernet / RS232 compatible communication for data downloading and further storage in PC are not found in D1 and D2 and the rest of the documents cited in the ISR.

The amended claims enclosed herewith may kindly be taken as amended claims under Article 19 of the PCT.