Residual current protection device and tripper

Patent metadata

Field	Value
Publication number	US-10892128-B2
Application number	US-201916366181-A
Country	US
Kind code	B2
Filing date	Mar 27, 2019
Priority date	Mar 30, 2018
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

The present application provides a residual-current protection device and a tripper. The residual-current protection device comprises: a flux transformer receiving a residual-current signal; a tripping output element outputting ON/OFF signals; an energy storage mechanism adapted to switch between an energy storage state and an energy release state, the energy storage mechanism having a locking unit that locks the energy storage mechanism in the energy storage state; and a transmission mechanism braked by the flux transformer, which drives the tripping output element to move and drives state of the energy storage mechanism to switch; the transmission mechanism comprising: a first rack cooperating with the locking unit, a second rack driving the tripping output element, and a reduction gear with a big gear engaged with the first rack and a small gear engaged with the second rack. By means of the gear rack transmission mechanism of the residual-current protection device, reduction transmission can be effected, driving force needed by energy storage may be reduced, and thus design requirements as high transmission efficiency, easy processing and assembly as well as low costs can be satisfied.

First claim

We claim:

1. A residual-current protection device, comprising:
a flux transformer receiving a residual-current signal;
a tripping output element outputting ON/OFF signals;
an energy storage mechanism adapted to switch between an energy storage state and an energy release state, the energy storage mechanism having a locking unit that locks the energy storage mechanism in the energy storage state; and
a transmission mechanism braked by the flux transformer, which drives the tripping output element to move and drives the energy storage mechanism to switch its state, the transmission mechanism including:
a first rack cooperating with the locking unit;
a second rack driving the tripping output element; and
a reduction gear, having a big gear engaged with the first rack and a small gear engaged with the second rack.

2. The residual-current protection device according to claim 1 , wherein the transmission mechanism comprises a button and a slot body for the button to slide.

3. The residual-current protection device according to claim 2 , wherein the locking unit comprises a U-shaped swing bar arranged within the slot body and a locking member adapted to change the shape of the slot body so as to control swing amplitude of the swing bar when the button is sliding.

4. The residual-current protection device according to claim 3 , wherein the locking member comprises a stepped structure arranged on the first rack and a wedge linked with the button via a reset spring, step faces of the stepped structure being provided opposite to a wedge face of the wedge.

5. The residual-current protection device according to claim 2 , wherein the button and an end face of the first rack opposite thereto have overlapped portions.

6. The residual-current protection device according to claim 2 , wherein the button comprises an integrally extended push rod that triggers the flux transformer to reset.

7. The residual-current protection device according to claim 1 , wherein the second rack is linked with the tripping output element via an energy storage spring.

8. The residual-current protection device according to claim 1 , wherein the device comprises a micro-switch mounted on a side of the first rack.

9. A tripper, comprising:
a residual-current protection device comprising:
a flux transformer receiving a residual-current signal;
a tripping output element outputting ON/OFF signals;
an energy storage mechanism adapted to switch between an energy storage state and an energy release state, the energy storage mechanism having a locking unit that locks the energy storage mechanism in the energy storage state; and
a transmission mechanism braked by the flux transformer, which drives the tripping output element to move and drives the energy storage mechanism to switch its state, the transmission mechanism including:
a first rack cooperating with the locking unit;
a second rack driving the tripping output element; and
a reduction gear, having a big gear engaged with the first rack and a small gear engaged with the second rack; and

a circuit breaker having a trip lever;
the tripping output element striking the trip lever when the energy storage mechanism is in energy release state.

10. The tripper according to claim 9 , wherein the tripper comprises a transformer, the residual-current protection device being mounted on a casing of the transformer.

11. The tripper according to claim 9 , wherein the transmission mechanism comprises a button and a slot body for the button to slide.

12. The tripper according to claim 11 , wherein the locking unit comprises a U-shaped swing bar arranged within the slot body and a locking member adapted to change the shape of the slot body so as to control swing amplitude of the swing bar when the button is sliding.

13. The tripper according to claim 12 , wherein the locking member comprises a stepped structure arranged on the first rack and a wedge linked with the button via a reset spring, step faces of the stepped structure being provided opposite to a wedge face of the wedge.

14. The tripper according to claim 11 , wherein the button and an end face of the first rack opposite thereto have overlapped portions.

15. The tripper according to claim 11 , wherein the button comprises an integrally extended push rod that triggers the flux transformer to reset.

16. The tripper according to claim 11 , wherein the second rack is linked with the tripping output element via an energy storage spring.

17. The tripper according to claim 9 , wherein the device comprises a micro-switch mounted on a side of the first rack.

Assignees

• Abb Spa

Inventors

• Liu Wensheng
• Ren Jiancheng
• Liang Baiqin

Classifications

• H01H83/144

  with differential transformer · CPC title

• H01H71/128 Primary

  Manual release or trip mechanisms, e.g. for test purposes (two similar push buttons for closing or resetting and opening or tripping H01H71/58; test switches for earth fault circuit breakers H01H83/04) · CPC title

• H01H71/125 Primary

  characterised by sensing elements, e.g. current transformers (for differential protection H01H83/144) · CPC title

• H01H71/58

  actuated by push-button, pull-knob, or slide · CPC title

• H01H71/1009

  Interconnected mechanisms (H01H71/1045 takes precedence; operated by excess current and other electrical conditions H01H83/20) · CPC title