CN217522580U - Energy consumption branch circuit and direct current circuit breaker - Google Patents

Abstract

This application belongs to the circuit breaker field, concretely relates to power consumption branch road and direct current circuit breaker, the power consumption branch road includes: the energy consumption module is connected with the energy storage element in parallel, the energy consumption module comprises a control switch and an energy consumption element which are connected in series, the comparison module can detect the voltage at two ends of the energy storage element, the controller is used for controlling the control switch to be switched on when the comparison module detects that the voltage at two ends of the energy storage element is larger than a first preset value, and controlling the control switch to be switched off when the comparison module detects that the voltage at two ends of the energy storage element is smaller than a second preset value. In this application, the voltage at comparison module real-time supervision energy storage component both ends, the controller breaks off or switches on according to the voltage control switch at energy storage component both ends, falls energy consumption of energy storage component gradually, compares with the scheme through the arrester energy-absorbing, and this power consumption branch road has prolonged direct current breaker's life-span, has reduced the maintenance cost.

Description

Energy consumption branch circuit and direct current circuit breaker

Technical Field

The application belongs to the circuit breaker field, concretely relates to power consumption branch road and direct current circuit breaker.

Background

The direct current circuit breaker is used as main protection of a traction power supply system protection unit and is a key device for overall protection of the traction power supply system. At present, a direct current circuit breaker adopts a metal oxide arrester (MOV) energy consumption branch circuit for energy absorption, and when overvoltage reaches the action voltage of the metal oxide arrester, the metal oxide arrester acts to dissipate energy stored by an inductor in an electric system. The metal oxide arrester is easy to damage when bearing overvoltage for many times, thereby reducing the reliability of the direct current breaker and shortening the service life of the direct current breaker.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide an energy consumption branch road and direct current breaker to improve direct current breaker's quick breaking capacity, improve direct current breaker's reliability, prolong direct current breaker's life.

In order to achieve the above object, the present application provides an energy consuming branch comprising:

the energy consumption module can be connected with the energy storage element in parallel and dissipates the energy stored by the energy storage element, and comprises a control switch and an energy consumption element which are connected in series;

the comparison module is connected with the energy consumption module in parallel and can detect the voltage at two ends of the energy storage element;

the controller is connected with the comparison module and the control switch, and is used for controlling the control switch to be switched on when the comparison module detects that the voltage at the two ends of the energy storage element is greater than a first preset value, and controlling the control switch to be switched off when the comparison module detects that the voltage at the two ends of the energy storage element is less than a second preset value; the second preset value is smaller than the first preset value.

Optionally, the control switch comprises an integrated gate-commutated thyristor, and/or the energy-consuming element comprises an energy-consuming resistor.

Optionally, the energy consumption module further includes a protector, and the protector is connected in parallel with the control switch.

Optionally, the energy consumption module further includes a rectifying unit, the rectifying unit is connected in parallel with the control switch, and the rectifying unit is configured to enable a direction of a conduction current of the control switch to be the same as a direction of a current of the energy storage element.

Optionally, the rectification unit includes a first diode, a second diode, a third diode, and a fourth diode, a cathode of the first diode and a cathode of the third diode are both connected to the first node, an anode of the fourth diode and an anode of the second diode are both connected to the second node, an anode of the first diode and a cathode of the fourth diode are both connected to the energy consumption element, and a cathode of the second diode and an anode of the third diode are both connected to the energy storage element;

the protector with the control switch all connects between the first node with the second node, the protector with the control switch connects in parallel.

Optionally, the protector includes a metal oxide arrester, the metal oxide arrester is connected between the first node and the second node, and the metal oxide arrester is connected in parallel with the control switch.

Optionally, the protector includes a buffer unit, the buffer unit is connected between the first node and the second node, and the buffer unit is connected in parallel with the control switch;

the buffer unit comprises a first capacitor and a first resistor which are connected in series.

Optionally, the comparison module includes a second resistor, a third resistor, and a load cell, where the second resistor and the third resistor are connected in series, and the load cell is connected in parallel with the third resistor.

Optionally, the third resistor includes a sliding rheostat, the sliding rheostat includes a resistance wire and a sliding end slidably disposed on the resistance wire, two ends of the resistance wire are connected to the second resistor and the energy storage element in a one-to-one correspondence, and the load cell is connected to the energy storage element and the sliding end.

The present application further provides a direct current circuit breaker, including:

an energy consumption branch;

the controller is connected with the main flow branch, and can control the main flow branch to disconnect the system current provided by the power utilization system when the power utilization system fails;

the current conversion branch is connected with the controller in parallel, the current conversion branch can generate reverse current when the main flow branch is disconnected with the system current under the control of the controller, the reverse current is opposite to the system current in direction, the current conversion branch comprises an inductor, a thyristor unit and a second capacitor which are connected in series, and the energy consumption module is connected with the second capacitor in parallel.

The application discloses power consumption branch road and direct current breaker has following beneficial effect:

in the application, the comparison module monitors voltages at two ends of the energy storage element in real time, when the comparison module detects that the voltages at the two ends of the energy storage element are larger than a first preset value, the controller controls the control switch to be switched on, current passes through the energy consumption element, and the energy consumption element consumes energy of the energy storage element; when the comparison branch circuit detects that the voltage at the two ends of the energy storage element is smaller than a second preset value, the controller controls the control switch to be switched off, the voltage at the two ends of the energy storage element rises again due to charging of system current, and the energy of the energy storage element is gradually consumed through the switch control switch for a plurality of times.

Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structure diagram of an energy consumption branch in the embodiment of the present application.

Fig. 2 is a schematic structural diagram of a dc circuit breaker in the embodiment of the present application.

Description of reference numerals:

100. a main flow branch; 110. a second current detection element; 120. a vacuum switch;

200. a current conversion branch circuit; 210. an inductance; 220. a thyristor unit; 221. a first thyristor; 222. a second thyristor; 230. a second capacitor;

300. a controller;

400. an energy consumption branch circuit; 410. an energy consumption module; 411. a control switch; 412. an energy dissipating element; 413. a protector; 4131. a metal oxide arrester; 4132. a buffer unit; 41321. a first capacitor; 41322. a first resistor; 414. a rectifying unit; 4141. a first diode; 4142. a second diode; 4143. a third diode; 4144. a fourth diode; 420. a comparison module; 421. a second resistor; 422. a third resistor; 423. a load cell;

500. testing the branch circuit; 510. testing the contactor; 520. testing the resistance; 530. a first current detection element;

600. an isolating switch;

11. a positive bus; 12. and a negative bus.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.

The present application is further described in detail below with reference to the following figures and specific examples. It should be noted that the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present application and should not be construed as limiting the present application.

Referring to fig. 1 and 2, the energy consumption branch 400 includes: an energy consuming module 410 and a comparison module 420. The energy consuming module 410 is capable of being connected in parallel with the energy storage element and dissipating the energy stored by the energy storage element. The energy consuming module 410 includes a control switch 411 and an energy consuming element 412 connected in series. The comparing module 420 is connected in parallel with the energy consuming module 410, and the comparing module 420 can detect the voltage across the energy storage element. The controller 300 is connected with the comparing module 420 and the control switch 411, the controller 300 is configured to control the control switch 411 to be turned on when the comparing module 420 detects that the voltage across the energy storage element is greater than a first preset value, and the controller 300 is configured to control the control switch 411 to be turned off when the comparing module 420 detects that the voltage across the energy storage element is less than a second preset value; the second preset value is smaller than the first preset value.

It should be noted that the energy consumption branch 400 may include a comparison module 420, but is not limited thereto, the comparison module 420 is used for detecting the voltage across the energy storage element, and the comparison module 420 may also be replaced with other voltage detection elements, such as a voltmeter or a voltage sensor, as the case may be.

In this application, the comparing module 420 monitors the voltages at the two ends of the energy storage element in real time, when the comparing module 420 detects that the voltages at the two ends of the energy storage element are greater than the first preset value, the controller 300 controls the control switch 411 to be turned on, the current passes through the energy consumption element 412, and the energy consumption element 412 consumes the energy of the energy storage element; when the comparing branch detects that the voltage across the energy storage element is smaller than the second preset value, the controller 300 controls the control switch 411 to be switched off, the voltage across the energy storage element rises again due to charging of the system current, and the energy of the energy storage element is gradually consumed through the control switch 411 which is switched on and off for many times.

Referring to fig. 1 and 2, the control switch 411 includes an integrated gate-commutated thyristor (i.e., IGCT), and the energy dissipation element 412 includes an energy dissipation resistor.

It should be noted that the energy dissipation element 412 may include an energy dissipation resistor, but is not limited thereto, and the energy dissipation element 412 may also be other electronic elements, as the case may be. The control switch 411 may include an integrated gate commutated thyristor, but is not limited thereto, and the control switch 411 may also be other types of switching elements, such as an insulated gate bipolar transistor (i.e., IGBT), a turn-off thyristor (i.e., GTO), and the like, as the case may be.

The control switch 411 comprises an integrated gate commutated thyristor, which combines the advantages of an insulated gate bipolar transistor with a turn-off thyristor, and has a capacity comparable to that of the turn-off thyristor, but a switching speed faster than that of the turn-off thyristor, and a bulky and complex buffer circuit of the turn-off thyristor can be omitted. The energy dissipation element 412 includes an energy dissipation resistor, which has a low cost and a long life, and can be applied to a dc circuit breaker to prolong the life of the dc circuit breaker.

Referring to fig. 1 and 2, the energy consumption module 410 further includes a protector 413, and the protector 413 is connected in parallel with the control switch 411.

The protector 413 is connected with the control switch 411 in parallel, the control switch 411 can be protected by the protector 413, the control switch 411 is prevented from being damaged due to overhigh voltage at two ends of the control switch 411 or overlarge current passing through the control switch 411, the service life of the energy consumption branch circuit 400 is prolonged, and the service life of the direct current breaker can be prolonged when the energy consumption branch circuit 400 is applied to the direct current breaker.

Referring to fig. 1 and 2, the energy consumption module 410 further includes a rectifying unit 414, the rectifying unit 414 is connected in parallel with the control switch 411, and the rectifying unit 414 is configured to enable a direction of a conducting current of the control switch 411 to be the same as a direction of a current of the energy storage element.

Since the rectifying unit 414 adjusts the direction of the current, when the energy consumption branch 400 is connected to the dc circuit breaker, the current direction is not limited, that is, the forward short-circuit current and the reverse short-circuit current can be switched off.

Referring to fig. 1 and 2, the rectifying unit 414 includes a first diode 4141, a second diode 4142, a third diode 4143, and a fourth diode 4144, a cathode of the first diode 4141 and a cathode of the third diode 4143 are both connected to the first node, an anode of the fourth diode 4144 and an anode of the second diode 4142 are both connected to the second node, an anode of the first diode 4141 and a cathode of the fourth diode 4144 are both connected to the energy consuming component 412, and a cathode of the second diode 4142 and an anode of the third diode 4143 are both connected to the energy storing component. That is, the rectifying unit 414 is a bridge rectifier circuit. The protector 413 and the control switch 411 are both connected between the first node and the second node, and the protector 413 and the control switch 411 are connected in parallel.

It should be noted that the rectifying unit 414 may be a bridge rectifying circuit, but is not limited thereto, and the rectifying unit 414 may also be another rectifying circuit, as the case may be. The first node and the second node are connection points of a plurality of electronic elements, and may be a terminal of an electronic element, such as the terminal of the first diode 4141, or may be a conductive line.

The rectifying unit 414 is a bridge rectifier circuit, which has a simple structure and adapts to the current direction through the rectifying unit 414.

Referring to fig. 1 and 2, the protector 413 includes a metal oxide arrester 4131, the metal oxide arrester 4131 is connected between the first node and the second node, and the metal oxide arrester 4131 is connected in parallel with the control switch 411. The number of the metal oxide arresters 4131 may be plural, for example, 2 to 3 metal oxide arresters 4131 may be provided and are all connected in parallel to the control switch 411.

It should be noted that the protector 413 may include the metal oxide arrester 4131, but is not limited thereto, and the protector 413 may also include other types of arresters or overvoltage protection circuits, as the case may be.

The metal oxide arrester 4131 has the advantages of fast response, stable performance, large current capacity, low residual voltage and simple structure, and the metal oxide arrester 4131 can protect the control switch 411 and prevent the control switch 411 from being damaged due to overhigh voltage at two ends of the control switch 411.

Referring to fig. 1 and 2, the protector 413 further includes a buffer unit 4132, the buffer unit 4132 being connected between the first node and the second node, the buffer unit 4132 being connected in parallel with the control switch 411. The buffer unit 4132 includes a first capacitor 41321 and a first resistor 41322 connected in series.

The buffer unit 4132 is connected in parallel with the control switch 411 to protect the control switch 411 and prevent the control switch 411 from being damaged due to the over-high voltage across the control switch 411. The metal oxide arrester 4131 and the buffer unit 4132 are combined to protect the control switch 411, so that the safety of the control switch 411 is further improved, and the risk of damage to the control switch 411 is reduced.

Referring to fig. 1 and 2, the comparison module 420 includes a second resistor 421, a third resistor 422, and a load cell 423, the second resistor 421 and the third resistor 422 are connected in series, and the load cell 423 is connected in parallel with the third resistor 422. The load cell 423 may include a fourth resistor.

It should be noted that the load cell 423 may include a fourth resistor, but is not limited thereto, the load cell 423 is used for detecting a voltage across the third resistor 422, and the load cell 423 may also include a voltmeter or a voltage sensor, etc., as the case may be.

The voltage across the energy storage element can be indirectly measured by detecting the voltage across the third resistor 422 through the load cell 423, so that the controller 300 controls the switch 411 to be turned off or on according to the voltage across the energy storage element, thereby consuming the energy stored in the energy storage element.

Referring to fig. 1 and fig. 2, the third resistor 422 may be a sliding varistor, which includes a resistance wire and a sliding end slidably disposed on the resistance wire, two ends of the resistance wire are connected to the second resistor 421 and the energy storage element in a one-to-one correspondence, and the load cell 423 is connected to the energy storage element and the sliding end.

The third resistor 422 is a sliding rheostat, the resistance value of the sliding rheostat can be adjusted, the voltage on the third resistor 422 can be adjusted, the voltage on the two ends of the energy storage element can be indirectly measured by detecting the voltage on the two ends of the third resistor 422 through the load cell 423, and the detectable voltage range is larger.

The present application also provides a dc circuit breaker, as shown in fig. 1 and 2, the dc circuit breaker including: the main flow branch 100, the commutation branch 200 and the energy consumption branch 400. The main flow branch 100 is used for connecting an electric system, when the dc circuit breaker normally works, a system current of the electric system can pass through the main flow branch 100, and after the electric system fails, the controller 300 can control the main flow branch 100 to disconnect the system current of the electric system. The commutation branch 200 is connected in parallel with the main flow branch 100, the commutation branch 200 is connected with the controller 300, and the commutation branch 200 can generate a reverse current after the main flow branch 100 disconnects the system current under the control of the controller 300, wherein the reverse current is opposite to the system current. The system current and the reverse current are superposed, so that the system current of the main flow branch 100 is suddenly increased at the time of fault and passes through the zero point. The commutation branch 200 comprises an inductance 210, a thyristor cell 220 and a second capacitance 230 in series. The aforementioned energy storage element may include a second capacitor 230, and the energy consumption module 410 is connected in parallel with the second capacitor 230, and the energy consumption branch 400 is capable of consuming energy of the second capacitor 230 under the control of the controller 300.

It should be noted that the energy consumption module 410 may be connected in parallel with the second capacitor 230, that is, the energy consumption module 410 is connected in parallel with some components in the commutation branch 200, but is not limited thereto, and the energy consumption module 410 may also be connected in parallel with the whole commutation branch 200, as the case may be.

In this application, change of current branch road 200 and mainstream branch road 100 and connect in parallel, when the system current surge appears in the power consumption system trouble, the controller 300 control mainstream branch road 100 and break off the system current, control change of current branch road 200 simultaneously and produce reverse current, reverse current and system current opposite direction, system current and reverse current can superpose and make mainstream branch road 100 system current zero crossing, the current transfer of mainstream branch road 100 changes current on branch road 200, energy consumption module 410 consumes the remaining energy on the branch road 200 that changes current, thereby protect the direct current circuit breaker, the life-span of extension direct current circuit breaker.

Referring to fig. 1 and 2, the main flow branch 100 may include a second current sensing element 110 and a vacuum switch 120, the second current sensing element 110 being used to sense a current on the main flow branch 100, and the vacuum switch 120 being used to disconnect the main flow branch 100.

It should be noted that the main flow branch 100 may include a vacuum switch 120, but is not limited thereto, and other types of switches may be used for the main flow branch 100, as the case may be. The second current detecting element 110 may include a current sensor, but is not limited thereto, and the second current detecting element 110 may also include an ammeter, as the case may be.

The vacuum switch 120 can rapidly cut off the system current when the power utilization system fails, and simultaneously the current converting branch circuit 200 generates reverse current, and the system current and the reverse current are superposed to rapidly extinguish the electric arc of the vacuum arc extinguishing chamber of the vacuum switch 120, so that the vacuum switch 120 is protected, the service life of the vacuum switch 120 is prolonged, and the service life of the direct current breaker is also prolonged.

Referring to fig. 1 and 2, the commutation branch 200 includes an inductor 210, a thyristor cell 220 and a second capacitor 230 connected in series. The thyristor cell 220 has a first state in which the second capacitor 230 discharges to generate a reverse current through the thyristor cell 220, and a second state in which a system current passes through the thyristor cell 220. The energy consumption branch 400 is connected in parallel with the second capacitor 230, that is, the energy consumption branch 400 is connected in parallel with some components in the commutation branch 200.

It should be noted that the commutation branch 200 may include a thyristor unit 220, but is not limited thereto, the thyristor unit 220 is used to control the direction of the current, and the commutation branch 200 may also control the direction of the current through other switch circuits, as the case may be.

After the main flow branch 100 disconnects the system current, the controller 300 controls the thyristor unit 220 to be in the first state, the second capacitor 230 is a pre-charging capacitor, the pre-charging second capacitor 230 discharges to generate a reverse current, the reverse current is a reverse resonance current, and the reverse resonance current is superposed with the system current, so that the current of the main flow branch 100 passes through a zero point, and an arc of a vacuum arc extinguish chamber of the vacuum switch 120 is rapidly extinguished at the current passing through the zero point;

after the arc of the vacuum arc-extinguishing chamber of the vacuum switch 120 is extinguished, the system current is transferred to the commutation branch 200, the controller 300 controls the thyristor unit 220 to be in the second state again, the second capacitor 230 is charged, and the energy is consumed through the energy consumption branch 400 connected in parallel with the second capacitor 230.

The second capacitor 230 and the inductor 210 can be used as energy storage elements to store energy, the second capacitor 230 is a pre-charging capacitor, after the main flow branch 100 disconnects the system current, the pre-charging second capacitor 230 discharges to generate a reverse current, so that an electric arc of a vacuum arc extinguish chamber of the vacuum switch 120 is rapidly extinguished, the service life of the vacuum switch 120 is prolonged, after the current zero crossing point of the main flow branch 100, the system current is transferred to the commutation branch 200 to charge the second capacitor 230, the energy consumption branch 400 consumes redundant electric energy of the second capacitor 230, the second capacitor 230 can be prevented from being damaged, and the service life of the direct current circuit breaker is prolonged.

Referring to fig. 1 and 2, the thyristor unit 220 includes a first thyristor 221 and a second thyristor 222 connected in inverse parallel, and in a first state, the controller 300 controls the first thyristor 221 to be turned on and the second thyristor 222 to be turned off, and in a second state, the controller 300 controls the second thyristor 222 to be turned on and the first thyristor 221 to be turned off.

The thyristor unit 220 includes a first thyristor 221 and a second thyristor 222 connected in parallel in reverse direction, the structure is simple by controlling the current direction through the two thyristors, and the thyristors can work under the conditions of high voltage and large current, and the control of the working process is convenient.

Referring to fig. 1 and 2, the power system has a positive bus bar 11 and a negative bus bar 12, and the main flow-through branch 100 is connected to the positive bus bar 11 and the negative bus bar 12 at both ends thereof, so as to be connected to the power system. The comparing module 420 detects the voltage across the second capacitor 230, and may indirectly detect the voltage across the positive bus 11 and the negative bus 12. The comparing module 420 may be connected in parallel with the second capacitor 230, but is not limited thereto, and both ends of the comparing module 420 may also be connected with the positive bus 11 and the negative bus 12 to directly detect voltages at both ends of the positive bus 11 and the negative bus 12, as the case may be.

The operating principle of the direct current circuit breaker in this application is as follows:

stage I: when the power utilization system fails, the fault current rises exponentially, and the controller 300 detects that the power utilization system fails and sends a brake-off signal to the vacuum switch 120;

and stage II: the vacuum switch 120 receives a switching-off signal sent by the controller 300, and completes switching-off to disconnect the main flow branch 100;

stage III: the controller 300 controls the first thyristor 221 to be switched on and the second thyristor 222 to be switched off, the second capacitor 230 is precharged to discharge, reverse current is generated in the current conversion branch 200, the reverse current is superposed with system current, the current of the main current branch 100 passes through the zero crossing point, and the electric arc of the vacuum arc extinguish chamber of the vacuum switch 120 is rapidly extinguished at the current zero crossing point;

and stage IV: after the current of the main flow branch 100 crosses the zero point, the controller 300 controls the first thyristor 221 to be disconnected and the second thyristor 222 to be connected, the system current is transferred to the commutation branch 200 to charge the second capacitor 230, and the voltage at two ends of the second capacitor 230 is increased;

and (5) stage V: the comparison module 420 monitors voltages at two ends of the positive bus 11 and the negative bus 12 in real time, when the voltages at two ends of the positive bus 11 and the negative bus 12 exceed a certain threshold, the controller 300 controls the control switch 411 to be switched on, the current passes through the energy consumption element 412, the energy consumption element 412 consumes energy of the commutation branch 200, when the voltages at two ends of the positive bus 11 and the negative bus 12 are reduced to the certain threshold, the controller 300 controls the control switch 411 to be switched off, the voltage at two ends of the second capacitor 230 is increased again due to charging of the system current, the energy of the commutation branch 200 is gradually consumed through the multiple-time switch control switch 411 until the energy stored in the inductor 210 and the second capacitor 230 is released finally, and the dc circuit breaker completes one current switching operation.

Referring to fig. 1 and 2, the dc circuit breaker further includes a test branch 500, the test branch 500 is connected in parallel with the main flow branch 100, the test branch 500 is connected to the controller 300, the test branch 500 can detect a fault of the power consumption system, and the controller 300 controls the main flow branch 100 to be conducted after the test branch 500 detects that the fault of the power consumption system is eliminated. The dc circuit breaker may further include a disconnecting switch 600, wherein the disconnecting switch 600 connects the positive and negative buses and the main flow branch 100, that is, the positive bus 11 is connected to one end of the main flow branch 100 through the disconnecting switch 600, and the negative bus 12 is connected to the other end of the main flow branch 100 through another disconnecting switch 600.

After the power utilization system breaks down, the isolating switch 600 is disconnected, after the fault of the power utilization system is eliminated, after the isolating switch 600 is switched on, the line of the power utilization system needs to be tested through the testing branch 500, and the vacuum switch 120 is allowed to be switched on after the test is qualified, so that the direct current breaker can be prevented from being communicated with the power utilization system with the fault, and the components of the power utilization system are prevented from being damaged.

Illustratively, the test branch 500 includes a test contactor 510, a test resistor 520, and a first current sensing element 530 in series.

It should be noted that the first current detecting element 530 may include a current sensor, but is not limited thereto, and the first current detecting element 530 may also include an ammeter, as the case may be.

The test resistor 520 is used as a load of the test branch 500, so that the test current can be prevented from being too large; the first current detection element 530 is configured to detect a test current, and indirectly determine whether a fault of the power consumption system is eliminated through the test current, and when the fault of the power consumption system is eliminated, the controller 300 controls the vacuum switch 120 to switch on; the test contactor 510 is used to quickly turn on or off to prevent a fault line from being closed.

The terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description herein, references to the description of the terms "some embodiments," "exemplary," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or exemplary is included in at least one embodiment or exemplary of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described, it is understood that the above embodiments are illustrative and should not be construed as limiting the present application and that various changes, modifications, substitutions and alterations can be made therein by those skilled in the art within the scope of the present application, and therefore all changes and modifications that come within the meaning of the claims and the description of the invention are to be embraced therein.

Claims (10)

1. An energy dissipating branch, comprising:

the energy consumption module can be connected with the energy storage element in parallel and dissipates the energy stored by the energy storage element, and comprises a control switch and an energy consumption element which are connected in series;

the comparison module is connected with the energy consumption module in parallel and can detect the voltage at two ends of the energy storage element;

the controller is connected with the comparison module and the control switch, and is used for controlling the control switch to be switched on when the comparison module detects that the voltage at the two ends of the energy storage element is greater than a first preset value, and controlling the control switch to be switched off when the comparison module detects that the voltage at the two ends of the energy storage element is less than a second preset value; the second preset value is smaller than the first preset value.

2. The energy dissipating branch of claim 1, wherein the control switch comprises an integrated gate commutated thyristor, and/or wherein the energy dissipating element comprises an energy dissipating resistor.

3. The energy dissipating branch of claim 1, wherein the energy dissipating module further comprises a protector connected in parallel with the control switch.

4. The energy consumption branch circuit according to claim 3, wherein the energy consumption module further comprises a rectifying unit, the rectifying unit is connected in parallel with the control switch, and the rectifying unit is configured to enable a direction of a conducting current of the control switch to be the same as a direction of a current of the energy storage element.

5. The energy consumption branch circuit according to claim 4, wherein the rectifying unit comprises a first diode, a second diode, a third diode and a fourth diode, a cathode of the first diode and a cathode of the third diode are both connected to the first node, an anode of the fourth diode and an anode of the second diode are both connected to the second node, an anode of the first diode and a cathode of the fourth diode are both connected to the energy consumption element, and a cathode of the second diode and an anode of the third diode are both connected to the energy storage element;

the protector and the control switch are connected between the first node and the second node, and the protector and the control switch are connected in parallel.

6. The energy dissipating branch of claim 5, wherein the protector comprises a metal oxide arrester connected between the first node and the second node, the metal oxide arrester being connected in parallel with the control switch.

7. The energy dissipating branch of claim 5, wherein the protector comprises a snubber unit connected between the first node and the second node, the snubber unit being connected in parallel with the control switch;

the buffer unit comprises a first capacitor and a first resistor which are connected in series.

8. The energy dissipating branch of claim 1, wherein the comparison module comprises a second resistor, a third resistor, and a load cell, the second resistor and the third resistor being connected in series, the load cell being connected in parallel with the third resistor.

9. The energy dissipating branch of claim 8, wherein the third resistor comprises a sliding rheostat, the sliding rheostat comprises a resistance wire and a sliding end slidably disposed on the resistance wire, two ends of the resistance wire are connected to the second resistor and the energy storage element in a one-to-one correspondence, and the load cell is connected to the energy storage element and the sliding end.

10. A direct current circuit breaker, comprising:

the energy dissipating branch of any one of claims 1 to 9;

the controller is connected with the main flow branch, and can control the main flow branch to disconnect the system current provided by the power utilization system when the power utilization system fails;

the current conversion branch is connected with the controller in parallel, the current conversion branch can generate reverse current after the system current is disconnected by the main flow branch under the control of the controller, the reverse current is opposite to the system current in direction, the current conversion branch comprises an inductor, a thyristor unit and a second capacitor which are connected in series, and the energy consumption module is connected with the second capacitor in parallel.

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