Deviation compensation method of potential transformer

Patent metadata

Field	Value
Publication number	US-9866137-B2
Application number	US-201514693742-A
Country	US
Kind code	B2
Filing date	Apr 22, 2015
Priority date	May 13, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A deviation compensation method of a potential transformer is provided. The deviation compensation method includes: providing first to Nth potential transformers to be installed at different locations in a high voltage direct current (HVDC) transmission system; supplying a first voltage to the first to Nth potential transformers provided; measuring voltage values output through the first to Nth transformers by the first voltage supplied; determining whether there is a deviation between the measured voltage values; and determining compensation values for correcting the measured voltage values to the same voltage value when there is the deviation.

First claim

What is claimed is:

1. A deviation compensation method of a potential transformer, the deviation compensation method comprising:
supplying, by an integrated measurement panel, a first voltage to first to Nth potential transformers, wherein the first voltage is a voltage for measuring a voltage output from each of the first to Nth potential transformers;
measuring, by the integrated measurement panel, the voltage output from each of the first to Nth potential transformers;
determining, by the integrated measurement panel, for each of the first to Nth potential transformers, whether a deviation of the voltage output exists between any of the first to Nth potential transformers;
when the deviation of the voltage output exists between any of the first to Nth potential transformers, determining, by the integrated measurement panel, for each of the first to Nth potential transformers, a compensation value which is used to make same the voltage output from each of the first to Nth potential transformers, and
when any of the first to Nth potential transformers on which compensation values have been determined has a fault that requires replacement of such potential transformer having the fault with a new potential transformer, determining, by the integrated measurement panel, a new compensation value for the new potential transformer based on the determined compensation value of each of the first to Nth potential transformers.

2. The deviation compensation method according to claim 1 , wherein the first to Nth potential transformers are connected to the integrated measurement panel in common.

3. The deviation compensation method according to claim 1 , wherein the method further comprises:
calculating an average value of the measured voltage output of at least some of the first to Nth transformers; and
determining, for each of the first to Nth potential transformers, the compensation value based on the average value.

4. The deviation compensation method according to claim 3 , further comprising storing the average value in memory as a reference value.

5. The deviation compensation method according to claim 4 , further comprising determining the compensation value of a N+1th potential transformer to be newly installed based on the stored reference value.

6. The deviation compensation method according to claim 3 , further comprising:
calculating, by the integrated measurement panel, the average value of the measured voltage output of all of the first to Nth potential transformers.

7. The deviation compensation method according to claim 1 , wherein the compensation value, for each of the first to Nth potential transformers, standardizes the voltage output from each of the first to Nth potential transformers relative to the first voltage.

8. The deviation compensation method according to claim 1 , wherein the compensation value, for each of the first to Nth potential transformers, is at least any one of a transformation ratio, an offset value, or a grain value to be applied to the first to Nth potential transformers.

9. A deviation compensation method of a potential transformer, the deviation compensation method comprising:
supplying, by an integrated measurement panel, a first voltage to first to Nth potential transformers, wherein the first voltage is a voltage for measuring a voltage output from each of the first to Nth potential transformers;
measuring, by the integrated measurement panel, the voltage output from each of the first to Nth potential transformers;
determining, by the integrated measurement panel, for each of the first to Nth potential transformers, whether a deviation of the voltage output exists between of any the first to Nth potential transformers;
when the deviation of the voltage output exists between any of the first to Nth potential transformers, determining, by the integrated measurement panel, for each of the first to Nth potential transformers, a compensation value which is used to make the voltage output from each of the first to Nth potential transformers to be within a voltage range to which the first voltage belongs, and
when any of the first to Nth potential transformers on which compensation values have been determined has a fault that requires replacement of such potential transformer having the fault with a new potential transformer, determining, by the integrated measurement panel, a new compensation value for the new potential transformer based on the determined compensation value of each of the first to Nth potential transformers.

Assignees

• Lsis Co Ltd

Inventors

• Choi Yong Kil

Classifications

• G01R31/62

  Testing of transformers · CPC title

• G01R15/14

  Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks · CPC title

• H02M5/458 Primary

  using semiconductor devices only · CPC title

• G01R35/00 Primary

  Testing or calibrating of apparatus covered by the other groups of this subclass · CPC title

• G01R31/027

  Physics · mapped topic