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Breaking device and inverter system

A breaking device and breaking unit technology, applied in the direction of automatic disconnection emergency protection device, circuit device, emergency protection circuit device, etc., can solve the problem of shortening the service life of the fuse, affecting the reliability of the breaking device, and low reliability of the breaking device problem, to achieve the effect of alleviating the fever phenomenon, alleviating the fever phenomenon, and high reliability

Inactive Publication Date: 2019-07-23
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] but, figure 1 The breaking device shown has the following problems in practical application: During normal operation, the output current of the photovoltaic string is shunted according to the internal resistance ratio of the relay and the fuse, so a considerable part of the current flows through the fuse, causing the fuse to heat up. , which shortens the service life of the fuse, thereby affecting the reliability of the breaking device
[0006] In summary, in the solutions provided in the prior art, there is a problem of low reliability of the breaking device

Method used

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  • Breaking device and inverter system
  • Breaking device and inverter system

Examples

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Effect test

example 1

[0095] see Image 6 , a breaking device provided in the embodiment of the present application. The breaking device is connected in series between the DC input terminal and the protected circuit, and when the protected circuit fails, the breaking device disconnects the electrical connection between the DC input terminal and the protected circuit.

[0096] Image 6 Disconnecting devices shown include fuses, current limiting resistors, relays and controllers. Among them, after the fuse and the current limiting resistor are connected in series, they are connected in parallel with the relay; the controller is used to control the pull-in or disconnection of the relay.

[0097] Image 6 The working principle of the shown breaking device is as follows: During normal operation, the controller controls the relay to pull in, and the current is shunted through the two branches of the fuse and the current limiting resistor series branch and the relay branch. The impedance of the resist...

example 2

[0106] see Figure 7 , a breaking device provided in the embodiment of the present application. The breaking device is connected in series between the DC input terminal and the protected circuit, and when the protected circuit fails, the breaking device disconnects the electrical connection between the DC input terminal and the protected circuit.

[0107] Figure 7 The disconnecting devices shown include fuses, diodes, relays and controllers. Among them, after the fuse and the diode are connected in series, they are connected in parallel with the relay; the controller is used to control the pull-in or disconnection of the relay.

[0108] Figure 7 The working principle of the shown breaking device is as follows: During normal operation, the controller controls the relay to pull in, and the current is shunted through the fuse and the diode series branch and the two branches of the relay branch. The conduction voltage drop acts on the relay branch. At this time, most of the ...

example 3

[0117] see Figure 8 , is a breaking device provided in the embodiment of this application. The breaking device is connected in series between the DC input terminal and the protected circuit. When the protected circuit fails, the breaking device disconnects the electrical connection between the DC input terminal and the protected circuit.

[0118] Figure 8 The breaking device shown includes a fuse, an oxide film removal circuit, a first relay, a controller, and a first current limiting resistor. The oxide film removal circuit is composed of a second relay and a second current limiting resistor connected in parallel, and the second relay is a normally closed relay. Wherein, the fuse, the first current limiting resistor, and the oxide film removal circuit are connected in parallel with the first relay after being connected in series; the controller is used to control the first relay to be turned on or off, and the second relay to be turned on or off.

[0119] Wherein, the de...

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Abstract

The embodiment of the invention discloses a breaking device and an inverter system which are used for cutting off electrical connection when a fault occurs in a protected circuit. The breaking deviceis connected in series with the protected circuit and is used for cutting off the electrical connection when the fault occurs in the protected circuit. The breaking device comprises a first branch, asecond branch and a controller, wherein the first branch comprises an overcurrent automatic breaking unit and a first current limiting unit, the overcurrent automatic breaking unit is used for automatically breaking when a passing current exceeds a breaking current threshold, the first current limiting unit is used for limiting a current on the first branch, the second branch is connected in parallel with the first branch and comprises a first controllable switch unit, a control end of the first controllable switch unit is connected with the controller and is used for breaking or attracting under control of the controller, and the controller is connected with the control end of the first controllable switch unit and the protected circuit and is used for controlling the first controllable switch unit to attract under normal working of the protected circuit and controlling the first controllable switch unit to break when the fault occurs in the protected circuit.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a breaking device and an inverter system. Background technique [0002] At present, large-scale photovoltaic power plants are generally connected to inverters in series through photovoltaic modules, and the inverter converts the direct current output from photovoltaic modules into alternating current, and then transmits it to the grid. Among them, the DC voltage output by the photovoltaic module is as high as hundreds of volts or even thousands of volts. When a fault occurs inside the inverter, if the photovoltaic module continues to inject energy into the inverter, it is easy to cause the fault to spread or even damage the inverter. Therefore, it is necessary to reliably and quickly cut off the electrical connection between the photovoltaic module and the inverter. Connected breaking device. [0003] In addition, for other power systems other than the above...

Claims

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Application Information

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IPC IPC(8): H02H7/12H02H7/122H02H9/02
CPCH02H7/122H02H7/1213H02H9/02H02H7/1225H02H3/08H02H3/06Y02E10/56
Inventor 王勋曹震高拥兵
Owner HUAWEI TECH CO LTD
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