Supplementary isolating device for remote operation of a circuit breaker for electrical equipment

Patent metadata

Field	Value
Publication number	US-10879018-B2
Application number	US-201716316238-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	Jul 8, 2016
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

The present disclosure relates to a supplementary isolating device for remote operation of a circuit breaker with interlocking functionality. The supplementary isolating device includes: an electrical disconnection switch manoeuvrable between a mechanically lockable first position and a mechanically lockable second position, which electrical disconnection switch is configured to be connected in the control circuit of a circuit breaker for an electrical drive system, wherein the supplementary isolating device is configured to send a first control voltage to the circuit breaker to provide an electrical disconnect and interlocking the operation of the circuit breaker, when the electrical disconnection switch is in the first position, an electric terminal configured to be connected to an auxiliary contact of the circuit breaker to obtain an operational status of the circuit breaker, and an indicator configured to indicate the operational status of the circuit breaker.

First claim

The invention claimed is:

1. A supplementary isolating device for remote operation of a circuit breaker with interlocking functionality, wherein the supplementary isolating device comprises:
an electrical disconnection switch manoeuvrable between a mechanically lockable first position and a mechanically lockable second position, which electrical disconnection switch is configured to be connected in the control circuit of a circuit breaker for an electrical drive system,
wherein the supplementary isolating device is configured to send a first control voltage to the circuit breaker to provide an electrical disconnect and interlocking the operation of the circuit breaker, when the electrical disconnection switch is in the first position,
an electric terminal, configured to be connected to an auxiliary contact of the circuit breaker to obtain an operational status of the circuit breaker, and
an indicator configured to indicate the operational status of the circuit breaker.

2. The supplementary isolating device as claimed in claim 1 , wherein the supplementary isolating device is configured to send a second control voltage to the circuit breaker to close the circuit breaker when the electrical disconnection switch is in the second position.

3. The supplementary isolating device as claimed in any of claim 2 , comprising a first switch terminal configured to be connected to an opening coil and to an undervoltage coil of the control circuit for providing the first control voltage, and a second switch terminal configured to be connected to a closing coil of the control circuit for providing the second control voltage.

4. The supplementary isolating device as claimed in claim 2 , wherein the electrical disconnection switch is configured to be locked in the first position and in the second position by means of a padlock.

5. The supplementary isolating device as claimed in claim 2 , wherein the indicator is a visual indicator.

6. The supplementary isolating device as claimed in claim 2 , comprising a first low voltage electric wire and a second low voltage electric wire each having a length in the order of a plurality of metres, the first electric wire and the second electric wire being configured to be connected between the electrical disconnection switch and the control circuit of the circuit breaker to send the first control voltage and the second control voltage, respectively, from the supplementary isolating device to the control circuit.

7. The supplementary isolating device as claimed in claim 2 , comprising a signal cable having a length in the order of a plurality of metres, the signal cable being configured to be connected between the electric terminal and the auxiliary contact to obtain the operational status of the circuit breaker.

8. The supplementary isolating device as claimed in claim 1 , wherein the electrical disconnection switch is configured to be locked in the first position and in the second position by means of a padlock.

9. The supplementary isolating device as claimed in claim 8 , comprising a first switch terminal configured to be connected to an opening coil and to an undervoltage coil of the control circuit for providing the first control voltage, and a second switch terminal configured to be connected to a closing coil of the control circuit for providing the second control voltage.

10. The supplementary isolating device as claimed in claim 1 , wherein the indicator is a visual indicator.

11. The supplementary isolating device as claimed in claim 1 , comprising a first low voltage electric wire and a second low voltage electric wire each having a length in the order of a plurality of metres, the first electric wire and the second electric wire being configured to be connected between the electrical disconnection switch and the control circuit of the circuit breaker to send the first control voltage and the second control voltage, respectively, from the supplementary isolating device to the control circuit.

12. The supplementary isolating device as claimed in claim 11 , wherein each of the first low voltage electric wire and the second low voltage wire has a length in the order of a plurality of metres.

13. The supplementary isolating device as claimed in claim 1 , comprising a signal cable having a length in the order of a plurality of metres, the signal cable being configured to be connected between the electric terminal and the auxiliary contact to obtain the operational status of the circuit breaker.

14. An electrical system for a motor, comprising:
an electrical drive system configured to drive the motor,
a circuit breaker with interlocking functionality,
wherein the circuit breaker is configured to disconnect the electrical drive system from a power source configured to power the electrical drive system, and
a supplementary isolating device configured to operate the circuit breaker from a remote location relative to the circuit breaker and the electrical drive system including:
an electrical disconnection switch manoeuvrable between a mechanically lockable first position and a mechanically lockable second position, which electrical disconnection switch is configured to be connected in the control circuit of a circuit breaker for an electrical drive system,
wherein the supplementary isolating device is configured to send a first control voltage to the circuit breaker to provide an electrical disconnect and interlocking the operation of the circuit breaker, when the electrical disconnection switch is in the first position,
an electric terminal configured to be connected to an auxiliary contact of the circuit breaker to obtain an operational status of the circuit breaker, and
an indicator configured to indicate the operational status of the circuit breaker.

15. The electrical system as claimed in claim 14 , wherein the circuit breaker includes a first button, a second button, an opening coil, an undervoltage coil and a closing coil, wherein the first button is configured to operate only the opening coil and the second button is configured to operate only the closing coil.

16. The electrical system as claimed in claim 15 , wherein the opening coil is configured to be operated with the first control voltage from the supplementary isolating device to provide an electrical disconnect of the circuit breaker, the closing coil being configured to be operated with the second control voltage from the supplementary isolating device to provide a closing of the circuit breaker, wherein the undervoltage coil is configured to be operated by the first control voltage to disconnect the opening coil from the first button and to disconnect the closing coil from the second button and to be operated by the second control voltage to connect the closing coil to the second button and the opening coil to the first button.

17. The electrical system as claimed in claim 16 , comprising a time delay device configured to be connected to the control circuit of the circuit breaker, and configured to be connected to the supplementary isolating device for receiving the first control voltage and the second control voltage and to operate the opening coil and the undervoltage coil and the closing coil, of the control circuit in accordance with the first control voltage and the second control voltage.

18. The electrical system as claimed in claim 17 , wherein the time delay device has a delay functionality configured to provide a delay from receiving the first control voltage to operating the opening coil, wherein the time delay device is configured to operate the undervoltage

Assignees

• Abb Schweiz Ag

Inventors

• Göransson Bertil
• Hansson Anders

Classifications

• H01H83/12

  operated by voltage falling below a predetermined value, e.g. for no-volt protection · CPC title

• H01H9/281

  making use of a padlock (H01H9/287 takes precedence) · CPC title

• H01H71/10

  Operating or release mechanisms · CPC title

• H01H2071/086

  Low power connections for auxiliary switches, e.g. shunt trip · CPC title

• H01H3/02 Primary

  Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch · CPC title