On-off control circuit of electromagnetic high-speed circuit breaker

Abstract

The utility model discloses an opening and closing control circuit for an electromagnetic high-speed circuit breaker, which belongs to the field of electromagnetic high-speed circuit breaker control in the locomotive vehicle field and comprises an opening relay K13, a closing relay K12, a high-speed circuit breaker HB1 and a current-limiting resistor R1. A normally open contact 14 of the closed relay K12 is connected with a positive electrode of a high-breaking coil of the high-speed circuit breaker HB1; a normally-closed contact 12 of the disconnection relay K13 is connected with one end of a current-limiting resistor R1, the other end of the current-limiting resistor R1 is connected with a normally-open auxiliary contact A3 of the high-speed circuit breaker HB1, and a normally-open auxiliary contact A4 is connected with the positive electrode of a high-breaking coil of the high-speed circuit breaker HB1; and a normally open auxiliary contact B4 of the high-speed circuit breaker HB1 is connected with a high open / close feedback signal DI port of the controller. According to the utility model, by reducing the large-current control relay of the pull-in loop, not only is the safe closing control of the high-voltage switch realized, but also the sequential logic of the control instruction of the high-voltage switch can be simplified, and meanwhile, the device cost and the cabinet space occupied by the device are reduced.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic high-speed circuit breaker control in the field of locomotives and rolling stock, in particular to an electromagnetic high-speed circuit breaker switching control circuit. Background Art

[0002] The electromagnetic high-speed circuit breakers in rolling stock have the ability to quickly trip under short-circuit and high-current conditions. They are typically installed at the front end of the vehicle's main circuit to provide short-circuit and overload protection for electrical equipment on the vehicle's main electrical circuit. During the closing process of the high-speed circuit breaker, the coil's instantaneous pull-in current is relatively high. Once the high-break main contacts close, a low holding current is required to prevent burnout. Typically, the pull-in current is over 20 times the holding current. Given this characteristic, the high-break closing control circuit must provide the required pull-in and holding currents for the coil according to the closing sequence.

[0003] Existing high-trip control circuits typically use two relays to switch between the high-trip coil's pickup and holding circuits. For example, in the on-off control method for a rail transit vehicle and its high-speed circuit breaker described in patent CN109515197A, KM1 and KM2 are simultaneously closed during pickup, forming a pickup circuit that provides pickup current to the high-trip coil Q01. After the holding sequence begins, KM2 opens, forming a holding circuit via R02 to provide low-holding current protection to the coil. Alternatively, a time-delay relay circuit can be used to switch between the pickup and current-limiting circuits by setting the delay time of time-delay relay KM3, thereby safely closing the high-speed circuit breaker.

[0004] The above-mentioned existing technology's pull-in circuits are all designed with two high-current relays. Since the high-break pull-in current is large, which can instantly exceed more than ten amperes, the relays arranged in this circuit need to be selected with contacts that can withstand the large pull-in current. Compared with conventional ordinary intermediate relays, the high-current relays are larger in size, inconvenient to arrange in the limited space of the electrical cabinet, and the cost is also higher. Utility Model Content

[0005] In view of the above problems existing in the prior art, the purpose of the present invention is to provide an electromagnetic high-speed circuit breaker opening and closing control circuit to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An electromagnetic high-speed circuit breaker opening and closing control circuit includes an opening relay K13, a closing relay K12, a high-speed circuit breaker HB1 and a current-limiting resistor R1;

[0008] One end of the coil of the disconnect relay K13 is connected to the high-break disconnect signal DO interface of the controller, and the other end of the coil of the disconnect relay K13 is connected to the negative electrode of the power supply;

[0009] One end of the coil of the closing relay K12 is connected to the high-break closing signal DO interface of the controller, and the other end of the coil of the closing relay K12 is connected to the negative electrode of the power supply;

[0010] The normally open contact 11 of the closing relay K12 is connected to the positive electrode of the power supply, the normally open contact 14 of the closing relay K12 is connected to the positive electrode of the high-speed trip coil of the high-speed circuit breaker HB1, and the negative electrode of the high-speed trip coil of the high-speed circuit breaker HB1 is connected to the negative electrode of the power supply, forming a high-speed trip closing control circuit;

[0011] The normally closed contact 11 of the disconnect relay K13 is connected to the positive electrode of the power supply. The normally closed contact 12 of the disconnect relay K13 is connected to one end of the current limiting resistor R1. The other end of the current limiting resistor R1 is connected to the normally open auxiliary contact A3 of the high-speed circuit breaker HB1. The normally open auxiliary contact A4 of the high-speed circuit breaker HB1 is connected to the positive electrode of the high-speed circuit breaker HB1's high-break coil, forming a high-break closing, current limiting and disconnection control circuit.

[0012] The normally open auxiliary contact B3 of the high-speed circuit breaker HB1 is connected to the positive pole of the power supply, and the normally open auxiliary contact B4 of the high-speed circuit breaker HB1 is connected to the high-speed opening and closing feedback signal DI interface of the controller.

[0013] As a further solution of the present invention: the power supply is a DC or AC power supply.

[0014] As a further solution of the present invention: the closing relay K12 used in the high-break closing control loop is a high-current relay.

[0015] As a further solution of the present invention: the high-break closing current limiting and opening control circuit includes a high-break closing current limiting circuit and a high-break opening control circuit connected in series in the same circuit loop.

[0016] As a further solution of the present invention: the disconnect relay K13 for realizing disconnect control in the high-break disconnect control circuit is a low-current relay.

[0017] As a further solution of the present invention: the high-break closed current limiting circuit is a self-locking circuit.

[0018] As a further solution of the present invention: the high-break closing signal provided by the controller is a pulse signal, and the pulse time range is between 0.5S-2S.

[0019] As a further solution of the present invention: the high-break disconnect signal given by the controller is a pulse signal.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The utility model reduces the high-current control relay of the pull-in circuit and adopts an ordinary intermediate relay as the disconnection control relay of the high-voltage disconnection, which not only realizes the safe closing control of the high-voltage disconnection, but also simplifies the control instruction timing logic of the high-voltage disconnection and closing, while also reducing the device cost and the cabinet space occupied by the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a circuit diagram of an electromagnetic high-speed circuit breaker opening and closing control circuit disclosed in an embodiment. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention; it is obvious that the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," and "connected" should be understood in a broad sense; for example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] See also Figure 1 , an electromagnetic high-speed circuit breaker opening and closing control circuit, comprising an opening relay K13, a closing relay K12, a high-speed circuit breaker HB1 and a current-limiting resistor R1;

[0026] One end of the coil of the disconnect relay K13 is connected to the high-break disconnect signal DO interface of the controller to receive the high-break disconnect signal given by the controller, and the other end of the coil of the disconnect relay K13 is connected to the negative electrode of the power supply;

[0027] One end of the coil of the closing relay K12 is connected to the high-break closing signal DO interface of the controller to receive the high-break closing signal given by the controller, and the other end of the coil of the closing relay K12 is connected to the negative electrode of the power supply;

[0028] The high-break closing signal given by the controller is a pulse signal, and the pulse time range is between 0.5S-2S. The specific value of the pulse signal is determined according to the characteristics of different high-breaks and actual debugging conditions.

[0029] The high-break disconnect signal given by the controller is a pulse signal. After the controller gives the disconnect signal and receives the high-break disconnect feedback signal, a certain delay processing is performed to turn off the high-break disconnect pulse signal. The specific delay time can be confirmed according to actual debugging.

[0030] The normally open contact 11 of the closing relay K12 is connected to the positive electrode of the power supply, the normally open contact 14 of the closing relay K12 is connected to the positive electrode of the high-speed trip coil of the high-speed circuit breaker HB1, and the negative electrode of the high-speed trip coil of the high-speed circuit breaker HB1 is connected to the negative electrode of the power supply, forming a high-speed trip closing control circuit;

[0031] The closing relay K12 used in the high-break closing control loop is a high-current relay, and the high-break closing control is achieved by closing the closing relay K12.

[0032] The normally closed contact 11 of the disconnect relay K13 is connected to the positive electrode of the power supply. The normally closed contact 12 of the disconnect relay K13 is connected to one end of the current limiting resistor R1. The other end of the current limiting resistor R1 is connected to the normally open auxiliary contact A3 of the high-speed circuit breaker HB1. The normally open auxiliary contact A4 of the high-speed circuit breaker HB1 is connected to the positive electrode of the high-speed circuit breaker HB1's high-break coil, forming a high-break closing, current limiting and disconnection control circuit.

[0033] The high-break closing current limiting and disconnection control circuit comprises a high-break closing current limiting circuit and a high-break disconnection control circuit connected in series in the same circuit loop.

[0034] The high-break disconnect control circuit is controlled by opening K13, a low-current relay. The high-break closed current-limiting circuit is self-locking, achieved by the normally open auxiliary contact pair of high-speed circuit breaker HB1 and its control coil.

[0035] The normally open auxiliary contact B3 of the high-speed circuit breaker HB1 is connected to the positive pole of the power supply, and the normally open auxiliary contact B4 of the high-speed circuit breaker HB1 is connected to the high-open / close feedback signal DI interface of the controller, which is used to feedback the high-open / close status to the controller.

[0036] Furthermore, the power supply is a DC or AC power supply, and the voltage of the power supply is 110V or other voltage levels.

[0037] When the high-voltage circuit breaker has the closing conditions, the vehicle outputs a closing permission instruction, the closing relay K12 is energized, the normally open contact pair 11 and 14 of the closing relay K12 are closed, the high-speed circuit breaker HB1 coil is energized, the high-voltage circuit breaker main contact closes, the two pairs of normally open auxiliary contact pairs A3 and A4 and B3 and B4 of the high-speed circuit breaker HB1 are closed, and the vehicle will receive the high-voltage circuit breaker closing feedback signal. At this time, the vehicle will turn off the closing permission instruction, and the closed circuit provided by the normally open contact pair of the closing relay K12 is disconnected. The self-locking current limiting circuit formed by the normally closed contact pair of the disconnecting relay K13, the current limiting resistor R1 and the normally open contact pair A3 and A4 of HB1 provides a small holding current to the high-speed circuit breaker HB1 coil.

[0038] When the high-voltage circuit breaker meets the disconnection conditions, the vehicle outputs a disconnection command, the disconnection relay K13 is energized, the normally closed contact pair 11 and 12 of the disconnection relay K13 are disconnected, the high-speed circuit breaker HB1 coil loses power, the high-voltage circuit breaker main contact is disconnected, and the two pairs of normally open auxiliary contact pairs A3 and A4 as well as B3 and B4 of the high-speed circuit breaker HB1 are disconnected. The vehicle will receive a high-voltage circuit breaker disconnection feedback signal, and the vehicle will then close the disconnection command.

[0039] The closed circuit of this utility model only has one high-current relay, K12. The other disconnect relay can be a conventional low-current relay, saving costs and reducing electrical cabinet layout space. The current-limiting circuit utilizes the auxiliary contacts of the high-voltage disconnector to form a self-locking circuit. Once closed, the high-voltage disconnector remains closed until it receives a disconnect signal, eliminating the need for the vehicle to provide a long closing signal. Similarly, the disconnect signal of the high-voltage disconnector does not need to be provided for a long time. The control logic is clear and simple.

[0040] The utility model reduces the high-current control relay of the pull-in circuit and adopts an ordinary intermediate relay as the disconnection control relay of the high-voltage disconnection, which not only realizes the safe closing control of the high-voltage disconnection, but also simplifies the control instruction timing logic of the high-voltage disconnection and closing, while also reducing the device cost and the cabinet space occupied by the device.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims, not the foregoing description, and is intended to encompass all variations within the meaning and range of equivalents of the claims, and any reference numerals in the claims should not be construed as limiting the claims to which they relate.

[0042] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An electromagnetic high-speed circuit breaker opening and closing control circuit, characterized in that: It includes an opening relay K13, a closing relay K12, a high-speed circuit breaker HB1 and a current-limiting resistor R1; One end of the coil of the disconnect relay K13 is connected to the high-break disconnect signal DO interface of the controller, and the other end of the coil of the disconnect relay K13 is connected to the negative electrode of the power supply; One end of the coil of the closing relay K12 is connected to the high-break closing signal DO interface of the controller, and the other end of the coil of the closing relay K12 is connected to the negative electrode of the power supply; The normally open contact at one end of the closing relay K12 is connected to the positive electrode of the power supply, the normally open contact at the other end of the closing relay K12 is connected to the positive electrode of the high-speed trip coil of the high-speed circuit breaker HB1, and the negative electrode of the high-speed trip coil of the high-speed circuit breaker HB1 is connected to the negative electrode of the power supply, forming a high-speed trip closed control circuit; The normally closed contact at one end of the disconnect relay K13 is connected to the positive electrode of the power supply, and the normally closed contact at the other end of the disconnect relay K13 is connected to one end of the current-limiting resistor R1. The other end of the current-limiting resistor R1 is connected to the normally open auxiliary contact A3 of the high-speed circuit breaker HB1. The normally open auxiliary contact A4 of the high-speed circuit breaker HB1 is connected to the positive electrode of the high-speed circuit breaker HB1's high-break coil, forming a high-break closing, current-limiting, and disconnection control circuit. The normally open auxiliary contact B3 of the high-speed circuit breaker HB1 is connected to the positive pole of the power supply, and the normally open auxiliary contact B4 of the high-speed circuit breaker HB1 is connected to the high-speed opening and closing feedback signal DI interface of the controller.

2. The electromagnetic high-speed circuit breaker opening and closing control circuit according to claim 1, characterized in that: The power supply is a DC or AC power supply.

3. The electromagnetic high-speed circuit breaker opening and closing control circuit according to claim 2, characterized in that: The closing relay K12 used in the high-break closing control loop is a high-current relay.

4. The electromagnetic high-speed circuit breaker opening and closing control circuit according to claim 3, characterized in that: The high-break closing current limiting and disconnection control circuit comprises a high-break closing current limiting circuit and a high-break disconnection control circuit connected in series in the same circuit loop.

5. The electromagnetic high-speed circuit breaker opening and closing control circuit according to claim 4, characterized in that: The disconnect relay K13 for realizing disconnect control in the high-break disconnect control loop is a low-current relay.

6. The electromagnetic high-speed circuit breaker opening and closing control circuit according to claim 5, characterized in that: The high-break closed current limiting circuit is a self-locking circuit.

7. The electromagnetic high-speed circuit breaker opening and closing control circuit according to claim 1, characterized in that: The high-break closing signal given by the controller is a pulse signal, and the pulse time range is between 0.5S-2S.

8. The electromagnetic high-speed circuit breaker opening and closing control circuit according to claim 7, characterized in that: The high-break disconnect signal given by the controller is a pulse signal.

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