Secure communication for commissioning and decommissioning circuit breakers and panel system

Patent metadata

Field	Value
Publication number	US-12212968-B2
Application number	US-201816487482-A
Country	US
Kind code	B2
Filing date	Feb 27, 2018
Priority date	Feb 28, 2017
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

Communication enabled circuit breakers are described. Methods associated with secure communication between communication enabled circuit breakers and a panel system are described. Additionally, methods for commissioning and decommissioning such communication enabled circuit breakers in the panel system are described. The communication enabled circuit breakers may be paired with a controller and information regarding such breakers can be added to a database.

First claim

We claim:

1. A method for commissioning a communicating circuit breaker, comprising:
executing, by a processor of the circuit breaker, commissioning instructions upon initially powering the circuit breaker in a circuit breaker panel, the commissioning instructions to cause the processor to:
electronically retrieve a unique identifier of the communicating circuit breaker, the unique identifier comprising a serial number of a wireless radio or a serial number of the processor;
calculate a delay time based on the unique identifier, wherein calculation of the delay time involves performance of a mathematical operation with a random number and at least part of the unique identifier, wherein calculating the delay based on the unique identifier comprises:
generating a first random number;
generate a second random number, wherein the unique identifier is a seed for the generation of the first and the second random numbers; and
deriving the delay based on a sum of the first and the second random numbers;

periodically broadcast a pairing beacon after the delay time has lapsed until a quiet command is received from a circuit breaker controller in the circuit breaker panel;
receive a channel ID assignment from the circuit breaker controller;
receive an encryption key pair from the circuit breaker controller;
initialize secure communication with the circuit breaker controller using the encryption key pair across the assigned channel ID;
receive a device information command from the circuit breaker controller, and
transmit device information from the communicating circuit breaker to the circuit breaker controller.

2. The method of claim 1 , the pairing beacon comprising an indication of at least one of an address of the communicating circuit breaker, a device access code, or an inquiry access code.

3. A method for commissioning communicating circuit breakers, comprising:
receiving, by a circuit breaker controller in a circuit breaker panel, from two or more of the communicating circuit breakers in the circuit breaker panel, pairing beacons;
sending an acknowledgement to each of the two or more communicating circuit breakers to acknowledge receipt of the pairing beacons, wherein the acknowledgements comprise an indication to stop broadcasting pairing beacons;
sending a channel ID assignment to a first communicating circuit breaker of the two or more communicating circuit breakers;
after sending the acknowledgement to each of the two or more communicating circuit breakers, receiving an encryption key pair from the first communicating circuit breaker, wherein receiving the encryption key pair comprises:
receiving a public key of an encryption key pair from the first communicating circuit breaker and
receiving a random number generated by the first communicating circuit breaker based on a private key of the first communicating circuit breaker and a public key received from the circuit breaker controller to allow the circuit breaker controller to calculate the private key of the first communicating circuit breaker;

initializing secure communication with the first communicating circuit breaker using the encryption key pair across the assigned channel ID;
sending a device information command to the first communicating circuit breaker; and
receiving device information from the first communicating circuit breaker in response to the sent device information command.

4. The method of claim 3 , wherein each of the pairing beacons comprise an indication of at least one of an address of one of the two or more communicating circuit breakers, a device access code of the one of the two or more communicating circuit breakers, or an inquiry access code of the one of the two or more communicating circuit breakers.

5. The method of claim 3 , comprising receiving the pairing beacons via wireless communications.

6. The method of claim 5 , wherein the wireless communications are Bluetooth, Bluetooth Low Energy, ZigBee, near field communication, or WiFi.

7. The method of claim 3 , wherein the encryption key pair is generated based in part on the pretty good privacy (PGP) encryption scheme or the elliptic-curve diffie-hellman (ECDH) encryption scheme.

8. A circuit breaker, comprising:
a wireless radio;
a processor coupled to the wireless radio; and
a memory coupled to the processor, the memory comprising commissioning instructions, which when executed by the processor,
cause the wireless radio to periodically broadcast a pairing beacon upon initially powering the circuit breaker, after a delay calculated based on a random number and a unique identifier of the circuit breaker, until a quiet command is received from a circuit breaker controller in the circuit breaker panel, the unique identifier comprising a serial number of a wireless radio or a serial number of the processor, wherein calculation of a delay time for the delay involves performance of a mathematical operation with a random number and at least part of the unique identifier, wherein calculating the delay based on the unique identifier comprises:
generating a first random number;
generate a second random number, wherein the unique identifier is a seed for the generation of the first and the second random numbers; and
deriving the delay based on a sum of the first and the second random numbers;

receive a channel ID assignment from the circuit breaker controller;
receive an encryption key pair from the circuit breaker controller;
initialize secure communication with the circuit breaker controller using the encryption key pair across the assigned channel ID;
receive a device information command from the circuit breaker controller; and
transmit device information from the circuit breaker to the circuit breaker controller.

9. The circuit breaker of claim 8 , the pairing beacon comprising an indication of at least one of an address of the circuit breaker, a device access code, or an inquiry access code.

10. The circuit breaker of claim 8 , the circuit breaker comprising a light emitting diode (LED), the memory further comprising commissioning instructions, which when executed by the processor cause the processor to illuminate the LED.

11. The circuit breaker of claim 8 , the memory further comprising commissioning instructions, which when executed by the processor cause the processor to generate an encryption key pair and initialize a secure communication channel with the circuit breaker controller based on the encryption key pair.

12. The circuit breaker of claim 8 , wherein once paired, the wireless radio ceases to broadcast the pairing beacon.

13. The circuit breaker of claim 8 , wherein the commissioning instructions, when executed by the processor cause the processor to pair with the circuit breaker controller for communication using the secure communication channel.

14. The circuit breaker of claim 8 , wherein the wireless radio is a Bluetooth radio, a WiFi radio, a ZigBee radio, or a near field communication radio.

15. A circuit breaker controller, comprising:
a wireless radio;
a processor coupled to the wireless radio; and
a memory coupled to the processor, the memory comprising commissioning instructions, which when executed by the processor, cause the wireless radio to:
receive pairing beacons from more than one circuit breakers with in a circuit breaker panel, wherein the circuit breaker controller is installed in the circuit breaker panel, wherein receipt of the pairing beacons from the more than one circuit breakers comprises receipt of a first pairing beacon broadcast from the first one of the more than one circuit breakers, the pairing beaco

Assignees

• Leviton Manufacturing Co

Inventors

• Freeman Scott
• Golwala Abhishek
• Monir Rejaul
• Keser Ozgur

Classifications

• H04W12/0471

  Key exchange · CPC title

• H04W12/03

  Protecting confidentiality, e.g. by encryption · CPC title

• H04Q2209/43

  using wireless personal area networks [WPAN], e.g. 802.15, 802.15.1, 802.15.4, Bluetooth® or Zigbee® · CPC title

• H04Q9/00

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title

• H02H1/0007

  concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445) · CPC title