Preventing out-of-synchronism reclosing between power systems

Patent metadata

Field	Value
Publication number	US-9478378-B2
Application number	US-201313734041-A
Country	US
Kind code	B2
Filing date	Jan 4, 2013
Priority date	Jan 4, 2013
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

The present disclosure provides apparatus, systems, and methods for preventing out-of-synchronism closing between power systems. An intelligent electronic device (IED) apparatus may include a control component and a delay component. The control component is configured to selectively control opening and closing of a breaker. The control component selectively outputs a close signal to cause the breaker to connect a first portion of a power delivery system to another portion of the power delivery system. The delay component is configured to delay output of the close signal to the breaker. The delay component includes circuitry independent from control by the control component and the delay component is inconfigurable from a remote location.

First claim

What is claimed:

1. An intelligent electronic device (IED), comprising:
a control component configured to selectively control opening and closing of a breaker, wherein the control component selectively outputs a close signal to cause the breaker to connect a first portion of a power delivery system to another portion of the power delivery system, the control component comprising:
a synchronization component in communication with the power delivery system, the synchronization component configured to determine whether the first portion of the power delivery system is synchronized with the another portion of the power delivery system and output a synchronization signal when the first portion of the power delivery system is synchronized with the another portion of the power delivery system; and,
a delay component in communication with the control component, configured to delay for a delay time, an output of the close signal to the breaker until both the synchronization signal is received from the synchronization component and the delay time ends, wherein the delay component comprises circuitry independent from control by the control component and wherein the delay component is only configurable by physical alteration of the IED;

wherein the delay component is configured to output the close signal to the breaker without delay upon receipt thereof until a predetermined number of close signals within a predetermined time period have been provided by the control component, after which the delay component is configured to delay further control commands.

2. The IED of claim 1 , wherein the delay component comprises a hardware configuration component and wherein the delay component is configurable on-site using the hardware configuration component.

3. The IED of claim 2 , wherein the hardware configuration component comprises a switch.

4. The IED of claim 2 , wherein the hardware configuration component comprises a jumper terminal.

5. The IED of claim 2 , wherein the delay component is configurable to a no-delay state wherein the output of the close signal is not delayed.

6. The IED of claim 2 , wherein the control component issues an alarm upon detecting a change in configuration of the hardware configuration component.

7. The IED of claim 1 , wherein the delay component comprises an analog timer circuit.

8. The IED of claim 1 , wherein the delay component comprises a time delay on pick up (TDPU) delay.

9. The IED of claim 1 , wherein the delay component comprises a counter component that allows a fixed number of reclose attempts before delaying output of the close signal.

10. The IED of claim 1 , further comprising an isolation component to detect isolation of the first portion of the power delivery system from the second portion of the power delivery system.

11. The IED of claim 10 , wherein the isolation component detects opening of the breaker.

12. The IED of claim 10 , wherein the first portion of the power delivery system comprises a portion of a power delivery grid isolatable by opening of the breaker and one or more additional breakers and wherein the isolation component detects opening of the breaker and the one or more additional breakers.

13. The IED of claim 1 , wherein the delay component is configured to delay the output of the close signal for a delay time measured from a time of isolation of the first portion of the power delivery system from the second portion of the power delivery system.

14. The IED of claim 1 , wherein the control component is configured to communicate over a communication link with a remote device.

15. A control system for controlling connection of a first portion of a power delivery system to a second portion of the power delivery system, the control system comprising:
a breaker;
a synchronization component in communication with the power delivery system, configured to determine whether the first portion of the power delivery system is synchronized with the second portion of the power delivery system and output a synchronization signal when the first portion of the power delivery system is synchronized with the second portion of the power delivery system; and
a microprocessor based relay comprising:
a control component configured to selectively control opening and closing of a breaker, wherein the control component selectively outputs a close signal to the breaker to connect the first portion of the power delivery system to the second portion of the power delivery system; and
a delay component in communication with the control component and the synchronization component, configured to delay for a delay time, output of the close signal to the breaker until both the synchronization signal is received from the synchronization component and the delay time ends, wherein the delay component comprises circuitry independent from control by the control component and wherein the delay component is only configurable by physical alteration of the control system;

wherein the delay component is configured to output the close signal to the breaker without delay upon receipt thereof until a predetermined number of close signals within a predetermined time period have been provided by the control component, after which the delay component is configured to delay further control commands.

16. The control system of claim 15 wherein the synchronization component is internal to the control system.

17. The control system of claim 15 , wherein the synchronization component is external to the control system.

18. The control system of claim 15 , wherein first and second portions of the power delivery system are isolatable by the breaker and one or more additional breakers.

19. The control system of claim 15 , wherein the first portion of the power delivery system comprises a rotating machine.

20. The control system of claim 19 , further comprising wherein the rotating machine comprises a generator.

21. The control system of claim 15 , wherein the delay component comprises a hardware configuration component and wherein the delay component is configurable on-site using the hardware configuration component.

22. The control system of claim 21 , wherein the control component issues an alarm upon detecting a change in configuration of the hardware configuration component.

23. A method for preventing out-of-synchronism closing, the method comprising:
determining whether a first portion of a power delivery system is synchronized with a second portion of the power delivery system with a synchronization component; outputting a synchronization signal when the first portion of the power delivery system is synchronized with a second portion of the power delivery system;
selectively controlling opening and closing of a breaker using a control component of an IED, wherein the control component selectively outputs a close signal to cause the breaker to connect the first portion of the power delivery system to the second portion of the power delivery system; and
delaying, for a delay time, output of the close signal to the breaker using a delay component of the IED until both the synchronization signal is received from the synchronization component and the delay time ends, wherein the delay component comprises circuitry independent from control by the control component and wherein the delay component is only configurable by physical alteration of the IED;
wherein the delay component outputs the close signal to the breaker without delay upon receipt thereof until a p

Assignees

• Schweitzer Engineering Lab Inc

Inventors

• Kasztenny Bogdan Z
• Finney Dale S

Classifications

• H01H47/00 Primary

  Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current · CPC title

• H02J3/44 Primary

  with means for ensuring correct phase sequence · CPC title

• H01H2071/006

  Provisions for user interfaces for electrical protection devices · CPC title

• H02J3/42

  with automatic parallel connection when synchronisation is achieved · CPC title

• H02J3/40

  Synchronisation of generators for connection to a network or to another generator · CPC title