Box-type substation, energy storage power supply system, and photovoltaic power generation system

Patent metadata

Field	Value
Publication number	US-12500413-B2
Application number	US-202418817537-A
Country	US
Kind code	B2
Filing date	Aug 28, 2024
Priority date	Aug 28, 2023
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A box-type substation, an energy storage power supply system, and a photovoltaic power generation system. The box-type substation includes a low-voltage cabinet, a high-voltage cabinet, a transformer, a first keychain, and a second keychain. When two circuit breakers in the low-voltage cabinet are in a switched-on state, each of the first keychain and the second keychain is locked at a corresponding circuit breaker. Therefore, when maintenance is performed on the transformer, the circuit breakers in the low-voltage cabinet are switched off first to remove the first keychain and the second keychain. Then, the first keychain and the second keychain are used together to switch off a disconnector in the high-voltage cabinet, and the first keychain and the second keychain are locked at the disconnector when the disconnector is in a switched-off state. Mechanical lock logic of the box-type substation is simple with high efficiency.

First claim

What is claimed is:

1 . A box-type substation comprising:
a low-voltage cabinet that comprises a first circuit breaker and a second circuit breaker; a high-voltage cabinet that comprises a disconnector; a transformer; a first keychain configured to switch on or switch off the first circuit breaker; and a second keychain configured to switch on or switch off the second circuit breaker, wherein the first circuit breaker is configured to control connection or disconnection between a low-voltage input of the box-type substation and one low-voltage winding of the transformer, the second circuit breaker is configured to control connection or disconnection between the low-voltage input of the box-type substation and the other low-voltage winding of the transformer, and the disconnector is configured to control connection or disconnection between a high-voltage winding of the transformer and an output of the box-type substation; when the first circuit breaker is switched on, the first keychain is locked at the first circuit breaker, when the second circuit breaker is switched on, the second keychain is locked at the second circuit breaker, and when the first circuit breaker and the second circuit breaker are both switched off, the first keychain and the second keychain are configured to simultaneously switch off the disconnector and are both locked at the disconnector.

2 . The box-type substation according to claim 1 , further comprising:
a first door; a second door; a third keychain; and a fourth keychain, wherein the high-voltage cabinet further comprises a grounding switch; when the disconnector is switched on, the grounding switch is switched off, when the disconnector is switched off, the grounding switch is switched on, when the grounding switch is switched on, the third keychain is configured to open the first door, and the fourth keychain is configured to open the second door, when the first door is in an open state, the third keychain is locked at the first door, and when the second door is in an open state, the fourth keychain is locked at the second door.

3 . The box-type substation according to claim 2 , wherein the first keychain comprises a first key, the second keychain comprises a second key, and the first circuit breaker comprises a first lock, and
when the first circuit breaker is switched on, the first key is locked at the first lock; and the second circuit breaker comprises a second lock, and when the second circuit breaker is switched on, the second key is locked at the second lock.

4 . The box-type substation according to claim 3 , wherein the disconnector further comprises a third lock and a fourth lock;
when the disconnector is switched off, the first key is locked at the third lock, and when the disconnector is switched off, the second key is locked at the fourth lock.

5 . The box-type substation according to claim 3 , wherein the disconnector further comprises a third lock and a fourth lock, the first keychain further comprises a third key, and the second keychain further comprises a fourth key;
when the disconnector is switched off, the third key is locked at the third lock; and when the disconnector is switched off, the fourth key is locked at the fourth lock.

6 . The box-type substation according to claim 5 , wherein the third lock and the fourth lock are locks of a same type, and the third key and the fourth key are keys of a same type.

7 . The box-type substation according to claim 1 , wherein the first lock and the second lock are locks of a same type, and the first key and the second key are keys of a same type.

8 . The box-type substation according to claim 2 , wherein the third keychain further comprises a fifth key, the fourth keychain further comprises a sixth key, and the grounding switch further comprises a fifth lock and a sixth lock; and
when the grounding switch is switched off, the fifth key is locked at the fifth lock, and the sixth key is locked at the sixth lock.

9 . The box-type substation according to claim 8 , wherein the first door further comprises a seventh lock, and the second door further comprises an eighth lock;
when the grounding switch is switched on, the fifth key is configured to open the first door and the sixth key is configured to open the second door; when the first door is opened, the fifth key is locked at the seventh lock; and when the second door is opened, the sixth key is locked at the eighth lock.

10 . The box-type substation according to claim 8 , wherein the first door further comprises a seventh lock, the second door further comprises an eighth lock, the third keychain further comprises a seventh key, and the fourth keychain further comprises an eighth key;
when the grounding switch is switched on, the seventh key is configured to open the first door and the eighth key is configured to open the second door; when the first door is opened, the seventh key is locked at the seventh lock; and when the second door is opened, the eighth key is locked at the eighth lock.

11 . The box-type substation according to claim 10 , wherein the seventh lock and the eighth lock are locks of a same type, and the seventh key and the eighth key are keys of a same type.

12 . The box-type substation according to claim 8 , wherein the fifth lock and the sixth lock are locks of a same type, and the fifth key and the sixth key are keys of a same type.

13 . An energy storage power supply system, comprising an energy storage apparatus, an energy storage converter, and the box-type substation which comprises
a low-voltage cabinet that comprises a first circuit breaker and a second circuit breaker; a high-voltage cabinet that comprises a disconnector; a transformer, a first keychain configured to switch on or switch off the first circuit breaker; and a second keychain configured to switch on or switch off the second circuit breaker, wherein the first circuit breaker is configured to control connection or disconnection between a low-voltage input of the box-type substation and one low-voltage winding of the transformer, the second circuit breaker is configured to control connection or disconnection between the low-voltage input of the box-type substation and the other low-voltage winding of the transformer, and the disconnector is configured to control connection or disconnection between a high-voltage winding of the transformer and an output of the box-type substation; when the first circuit breaker is switched on, the first keychain is locked at the first circuit breaker, when the second circuit breaker is switched on, the second keychain is locked at the second circuit breaker, and when the first circuit breaker and the second circuit breaker are both switched off, the first keychain and the second keychain are configured to simultaneously switch off the disconnector and are both locked at the disconnector.

14 . The energy storage power supply system of claim 13 , wherein the energy storage converter is configured to:
convert a direct current output by the energy storage apparatus into an alternating current; and output the alternating current to the box-type substation.

15 . The energy storage power supply system of claim 13 , wherein the energy storage converter is configured to:
convert an alternating current input by the box-type substation into a direct current; and input the direct current to the energy storage apparatus.

16 . The energy storage power supply system of claim 13 , wherein the box-type substation is configured to:
perform voltage boosting proces

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Huang Qiang
• Zhao Yazhu
• Pan Haiyang
• Zhou Peng
• Wang Xishan

Classifications

• H02J2101/24

  Photovoltaics · CPC title

• H02J3/381

  Dispersed generators · CPC title

• H02J3/32

  using batteries or super capacitors with converting means · CPC title

• H02B1/46

  Boxes; Parts thereof or accessories therefor · CPC title

• H02B1/24

  Circuit arrangements for boards or switchyards · CPC title