System for locating power faults based on a direction of current flow

Patent metadata

Field	Value
Publication number	US-12332292-B2
Application number	US-202218057122-A
Country	US
Kind code	B2
Filing date	Nov 18, 2022
Priority date	Nov 18, 2022
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

Systems and methods, and computing platforms for determining a fault in a power system, executing on a controller are disclosed. Exemplary implementations can receive, from the plurality of system control modules, a plurality of power flow directions as measured by the plurality of line current sensors, receive, from the plurality of system control modules, a plurality of voltage measurements based on measurements of a plurality of potential transformers, determine a location of a power fault using the plurality of power flow directions, and determine a phase of the power fault using the plurality of voltage measurements.

First claim

What is claimed is:

1. A power system for identifying power faults, the power system comprising:
a plurality of line current sensors each disposed between a load bus and one or more power sources;
a plurality of system control modules, each operatively coupled to one or more of the plurality of line current sensors; and
one or more controllers configured to:
receive, from the plurality of system control modules, a plurality of power flow directions as measured by the plurality of line current sensors;
receive, from the plurality of system control modules, a plurality of voltage measurements based on measurements of a plurality of potential transformers;
determine a location of a power fault using the plurality of power flow directions; and
determine a phase of the power fault using the plurality of voltage measurements.

2. The power system of claim 1 , further comprising a respective plurality of line current sensors between a first neutral bus and each of the one or more power sources, wherein the one or more power sources comprise a plurality of power sources.

3. The power system of claim 2 , wherein the one or more controllers is further configured to:
receive, from the plurality of system control modules, current values measured by the plurality of line current sensors between the first neutral bus and a respective second neutral bus of each of a plurality of generators of the one or more power sources;
determine the location of the power fault further based on respective directions of power flow at each of the plurality of line current sensors between the first neutral bus and each of the second neutral buses; and
determine the phase of the power fault further based on respective directions of power flow at each of the plurality of line current sensors between the first neutral bus and each of the second neutral buses.

4. The power system of claim 2 , wherein the one or more controllers is further configured to determine no power fault present in the power system based on the respective directions of power flow at each respective line current sensor.

5. The power system of claim 2 , wherein the plurality of line current sensors comprises a first line current sensor and a second line current sensor, and wherein the one or more controllers are further configured to:
receive a first value of current flow from the first line current sensor, the first line current sensor electrically coupled between a first power source of the one or more power sources and the load bus;
receive a second value of current flow from the second line current sensor, the second line current sensor electrically coupled between the first power source and the first neutral bus;
receive a first value of voltage from a first potential transformer; receive a second value of voltage from a second potential transformer;
determine a first direction of power flow in the first line current sensor using the first value of current flow;
determine a second direction of power flow in the second line current sensor using the second value of current flow;
determine, based on the first direction of power flow and the second direction of power flow, a power fault is located on one of:
a first generator bus coupling the first power source with the load bus; or
the load bus; and

determine, based on the first value of voltage and the second value of voltage, a phase of the power fault is located on one of:
the first generator bus; or
the load bus.

6. The power system of claim 5 , wherein the one or more controllers are further configured to:
receive a third value of current flow from a third line current sensor, the third line current sensor electrically coupled between a second power source of the one or more power sources, and the load bus;
receive a third value of voltage from a third potential transformer;
determine a third direction of power flow in the third line current sensor using the third value of current flow;
determine, based on the third direction of power flow, the power fault is located on one of:
the first generator bus; or
the load bus; and

determine, based on the third value of voltage, a phase of the power fault is located on one of:
the first generator bus; or
the load bus.

7. The power system of claim 6 , wherein the one or more controllers are further configured to determine if the power fault is located on a second generator bus coupling the second power source with the load bus.

8. The power system of claim 5 , further comprising a circuit breaker installed on the first generator bus, wherein the one or more controllers are further configured to:
determine the power fault is located on the first generator bus, and
trip the circuit breaker installed on the first generator bus.

9. The power system of claim 1 , further comprising a single grounding point.

10. The power system of claim 1 , further comprising a plurality of grounding points.

11. The power system of claim 3 , wherein one of the one or more controllers is a controller integrated into one of the plurality of generators.

12. A method of determining a fault in a power system, executing on a controller, the method comprising:
receiving a first value of current flow from a first line current sensor, the first line current sensor electrically coupled between a first generator bus and a load bus;
receiving a second value of current flow from a second line current sensor, the second line current sensor electrically coupled between a second generator bus and the load bus;
receiving a first value of voltage from a first potential transformer;
receiving a second value of voltage from a second potential transformer;
determining a first direction of power flow in the first line current sensor using the first value of current flow;
determining a second direction of power flow in the second line current sensor using the second value of current flow;
determining, based on the first direction of power flow and the second direction of power flow, a power fault is located on one of:
the first generator bus or the second generator bus; or
the load bus; and

determining, based on the first value of voltage and the second value of voltage, a phase of the power fault is located on one of:
the first generator bus or the second generator bus; or
the load bus.

13. The method of claim 12 , further comprising:
operatively connecting the first generator bus to a first generator; and
operatively connecting the second generator bus to a second generator.

14. The method of claim 13 , further comprising:
receiving a third value of current flow from a third line current sensor, the third line current sensor electrically coupled on between a second generator bus and the load bus;
receiving a third value of voltage from a third potential transformer;
determining a third direction of power flow in the third line current sensor using the third value indicative of current flow;
determining, based on the third direction of power flow, the power fault is located on one of:
the first generator bus; or
the second generator bus; and

determining, based on the third value of voltage, a phase of the power fault is located on one of:
the first generator bus or the second generator bus; or
the load bus.

15. The method of claim 13 , further comprising:
tripping, based on determining the phase of the power fault and the power fault is located on one of the first generator bus of the power system or the second generator bus of the power system, a respective circuit breaker operatively connected to:
the first generator bus; or
the

Assignees

• Cummins Power Generation Inc

Inventors

• Verma Shubhranshu
• Dorough John
• Lee Der Ueng
• Karim Saklain
• Schultz Mark H

Classifications

• H02H7/261

  involving signal transmission between at least two stations (transmission of signals in general H02H1/0061) · CPC title

• H02H3/382

  involving phase comparison between current and voltage or between values derived from current and voltage · CPC title

• G01R31/086 Primary

  in power transmission or distribution networks, i.e. with interconnected conductors · CPC title

• G01R19/0092

  Measuring current only · CPC title

• G01R19/0084

  Measuring voltage only · CPC title