Middle-high voltage circuit breaker power-loss automatic tripping loop and power supply system

Abstract

The utility model relates to a middle-high voltage circuit breaker power-loss automatic tripping loop and a power supply system, the middle-high voltage circuit breaker power-loss automatic tripping loop comprises an energy storage element and an intermediate relay, one end of the energy storage element is connected with one end of a tripping coil of the middle-high voltage circuit breaker, and the other end of the energy storage element is connected with the intermediate relay; the other end of the energy storage element is connected to the other end of the coil of the high-voltage relay through a normally open contact of the intermediate relay; one end of a coil of the intermediate relay is connected to one end of the power supply, and the other end of the intermediate relay is connected to the other end of the power supply. When the power supply is powered off, the middle-high voltage circuit breaker is in a switched-off state, and when the power supply is recovered, a loop or a load which needs to be manually switched off cannot be electrified, so that damage to equipment and personnel is avoided, and normal operation of the equipment and personal safety are ensured.

Description

Technical Field

[0001] The present application relates to the technical field of power supply, and in particular to a medium- and high-voltage circuit breaker power-off automatic tripping circuit and a power supply system. Background Art

[0002] like Figure 1 The control circuit of the existing medium and high voltage circuit breaker shown in the figure, in some 6-10KV power consumption places, there is no DC panel and UPS power supply to provide control power. The control power is taken from the low-voltage side of the primary element voltage transformer. When the primary circuit loses power due to a fault or other reasons, the control circuit has no control power, and the microcomputer protection cannot perform protection tripping. At the same time, the 6-10KV circuit breaker generally does not have the function of tripping due to loss of pressure, so the circuit breaker will be in the closed position after the power outage. Some circuits or special loads must be manually powered on to restore power after a power outage. When the power supply is restored, if the circuit breaker is in the closed state, the circuit will be powered, which may cause great harm to the equipment or personnel. Utility Model Content

[0003] In view of the above problems, the present application provides a medium- and high-voltage circuit breaker automatic tripping circuit and power supply system in the event of power failure, which solves the problem that in existing 6-10KV power usage sites, after a power outage, the medium- and high-voltage circuit breakers are in the closed position. When the power supply is restored, the medium- and high-voltage circuit breakers are in the closed state, so that the circuits that require manual power supply will be energized, which may cause damage to equipment or personnel.

[0004] To achieve the above purpose, the inventor provides a medium and high voltage circuit breaker power failure automatic tripping circuit, including an energy storage element and an intermediate relay:

[0005] An energy storage element, one end of which is connected to one end of the trip coil of the medium- and high-voltage circuit breaker, and the other end of which is connected to the other end of the coil of the high-voltage relay through the normally open contact of the intermediate relay;

[0006] One end of the coil of the intermediate relay is connected to one end of the power supply, and the other end of the intermediate relay is connected to the other end of the power supply.

[0007] In some embodiments, the energy storage element is an energy storage capacitor, and the other end of the energy storage capacitor is connected to a power supply.

[0008] In some embodiments, the other end of the energy storage capacitor is connected to the power supply through a diode, the anode of the diode is connected to the power supply, and the cathode of the diode is connected to the energy storage capacitor.

[0009] Another technical solution is provided, a power supply system, including a power supply, a switch, a medium-high voltage circuit breaker and a medium-high voltage circuit breaker power failure automatic tripping circuit;

[0010] One end of the trip coil of the medium and high voltage circuit breaker is connected to the power supply through a switch;

[0011] The medium and high voltage circuit breaker power failure automatic tripping circuit includes an energy storage element and an intermediate relay;

[0012] An energy storage element, one end of which is connected to one end of the trip coil of the medium- and high-voltage circuit breaker, and the other end of which is connected to the other end of the coil of the medium- and high-voltage circuit breaker through the normally open contact of the intermediate relay;

[0013] One end of the coil of the intermediate relay is connected to one end of the power supply, and the other end of the intermediate relay is connected to the other end of the power supply.

[0014] In some embodiments, the energy storage element is an energy storage capacitor, and the other end of the energy storage capacitor is connected to a power supply.

[0015] In some embodiments, the other end of the energy storage capacitor is connected to the power supply through a diode, the anode of the diode is connected to the power supply, and the cathode of the diode is connected to the energy storage capacitor.

[0016] In some embodiments, the switch is a push button switch.

[0017] Different from the prior art, the above technical scheme is that when the power supply is working normally, the coil of the intermediate relay supplies power normally. At this time, the normally open contact of the intermediate relay is in an open and closed state, and the trip coil of the medium and high voltage circuit breaker is in a normal power supply state. When the power supply is cut off, the coil of the intermediate relay loses power, and the normally open contact of the intermediate relay is closed. The normally open contact of the intermediate relay, the energy storage element and the trip coil of the medium and high voltage circuit breaker form a circuit. The trip coil of the medium and high voltage circuit breaker is discharged through the energy storage element, so that the medium and high voltage circuit breaker trips, ensuring that when the power supply is cut off, the medium and high voltage circuit breaker is in a disconnected state. When the power is restored, the circuit or load that requires manual power supply will not be energized, avoiding damage to equipment and personnel, and ensuring the normal operation of equipment and personal safety.

[0018] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation method and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.

[0020] In the drawings of the specification:

[0021] Figure 1 A circuit diagram of a control circuit of an existing medium and high voltage circuit breaker described in the background technology;

[0022] Figure 2 A circuit diagram of a power-off automatic tripping circuit of a medium- and high-voltage circuit breaker described in a specific implementation manner;

[0023] Figure 3 Another circuit diagram of the automatic tripping circuit of the medium and high voltage circuit breaker when power is lost as described in the specific implementation method;

[0024] Figure 4 Another circuit diagram of the automatic tripping circuit of the medium and high voltage circuit breaker upon power failure described in the specific implementation method. DETAILED DESCRIPTION

[0025] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0026] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0027] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0028] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0029] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0030] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0031] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0032] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0033] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0034] See also Figure 2 This embodiment provides a medium- and high-voltage circuit breaker power-off automatic tripping circuit, including an energy storage element P and an intermediate relay:

[0035] An energy storage element P, one end of which is connected to one end of the trip coil KC of the medium and high voltage circuit breaker, and the other end of which is connected to the other end of the coil of the high voltage relay through the normally open contact ZJ2 of the intermediate relay;

[0036] One end of the coil ZJ1 of the intermediate relay is connected to one end of the power supply, and the other end of the intermediate relay is connected to the other end of the power supply.

[0037] When the power supply is working normally, the coil ZJ1 of the intermediate relay supplies power normally. At this time, the normally open contact ZJ2 of the intermediate relay is in an open and closed state, and the trip coil KC of the medium and high voltage circuit breaker is in a normal power supply state. When the power supply is cut off, the coil ZJ1 of the intermediate relay loses power, and the normally open contact ZJ2 of the intermediate relay is closed. The normally open contact ZJ2 of the intermediate relay, the energy storage element P and the trip coil KC of the medium and high voltage circuit breaker form a circuit. The trip coil KC of the medium and high voltage circuit breaker is discharged through the energy storage element P, so that the medium and high voltage circuit breaker trips, ensuring that when the power supply is cut off, the medium and high voltage circuit breaker is in a disconnected state, and when the power is restored, the circuit or load that requires manual power supply will not be energized, avoiding damage to equipment and personnel, and ensuring the normal operation of equipment and personal safety.

[0038] Among them, medium and high voltage circuit breakers include medium voltage circuit breakers and high voltage circuit breakers. High voltage circuit breakers are electrical appliances used in power grids with rated voltages of 110kV and above for opening and closing conductive circuits. Medium voltage circuit breakers are electrical appliances used in power grids with rated voltages of 3KV-35KV for opening and closing conductive circuits.

[0039] See also Figure 3 In some embodiments, the energy storage element P is an energy storage capacitor C, and the other end of the energy storage capacitor C is connected to a power supply.

[0040] When the power supply is operating normally, the energy storage capacitor C is charged with energy. When the power supply is lost, a circuit is formed by the normally open contact ZJ2 of the intermediate relay, the energy storage capacitor C and the tripping coil of the medium and high voltage circuit breaker. The energy storage capacitor C is discharged to trip the medium and high voltage circuit breaker.

[0041] See also Figure 4 In some embodiments, the other end of the energy storage capacitor C is connected to the power supply through a diode D, the anode of the diode D is connected to the power supply, and the cathode of the diode D is connected to the energy storage capacitor C.

[0042] The energy storage capacitor C is connected to the power supply through the diode D. By utilizing the single-phase conduction of the diode D, the energy storage capacitor C can be charged when the power supply is normal. When the power supply fails, due to the unidirectional conduction characteristic of the diode D, the charge released by the energy storage capacitor C cannot pass through the diode D, and the charge released by the energy storage capacitor C is sent to the tripping coil KC of the medium and high voltage circuit breaker, ensuring that the medium and high voltage circuit breaker can trip normally when the power supply fails.

[0043] In other embodiments, the energy storage element P may also be an energy storage battery. Under normal power supply, the normally open contact ZJ2 of the intermediate relay is in a disconnected state, and the energy storage battery will not discharge the trip coil KC of the medium and high voltage circuit breaker. When the mains power is on, the normally open contact ZJ2 of the intermediate relay is connected, so that the energy storage battery can discharge the trip coil KC of the medium and high voltage circuit breaker. The energy storage battery may be a solar cell, a rechargeable battery, a dry cell, etc.

[0044] In some embodiments, a medium-voltage and medium-high voltage circuit breaker is provided, which can automatically trip when both the primary circuit and the control circuit lose power. A capacitor energy storage circuit is added to the circuit. When the control circuit is powered, the energy storage capacitor is charged. When the control circuit loses power, the normally open contacts of the intermediate relay, the energy storage capacitor and the tripping coil form a circuit, and the medium-voltage and medium-high voltage circuit breaker is tripped by discharging the energy storage capacitor. The circuit breaker needs to be automatically opened after a power outage, which ensures product quality and the safety and reliability of user electricity use.

[0045] See also Figure 2 , a power supply system, including a power supply, a switch TA, a medium-high voltage circuit breaker and a medium-high voltage circuit breaker power failure automatic tripping circuit;

[0046] One end of the trip coil KC of the medium and high voltage circuit breaker is connected to the power supply through a switch TA;

[0047] The medium and high voltage circuit breaker power failure automatic tripping circuit includes an energy storage element P and an intermediate relay;

[0048] An energy storage element P, one end of which is connected to one end of the trip coil KC of the medium- and high-voltage circuit breaker, and the other end of which is connected to the other end of the coil of the medium- and high-voltage circuit breaker through the normally open contact ZJ2 of the intermediate relay;

[0049] One end of the coil ZJ1 of the intermediate relay is connected to one end of the power supply, and the other end of the intermediate relay is connected to the other end of the power supply.

[0050] When the power supply is working normally, the coil ZJ1 of the intermediate relay supplies power normally. At this time, the normally open contact ZJ2 of the intermediate relay is in an open and closed state, and the trip coil KC of the medium and high voltage circuit breaker is in a normal power supply state. When the power supply is cut off, the coil ZJ1 of the intermediate relay loses power, and the normally open contact ZJ2 of the intermediate relay is closed. The normally open contact ZJ2 of the intermediate relay, the energy storage element P and the trip coil KC of the medium and high voltage circuit breaker form a circuit. The trip coil KC of the medium and high voltage circuit breaker is discharged through the energy storage element P, so that the medium and high voltage circuit breaker trips, ensuring that when the power supply is cut off, the medium and high voltage circuit breaker is in a disconnected state, and when the power is restored, the circuit or load that requires manual power supply will not be energized, avoiding damage to equipment and personnel, and ensuring the normal operation of equipment and personal safety.

[0051] See also Figure 3 In some embodiments, the energy storage element P is an energy storage capacitor C, and the other end of the energy storage capacitor C is connected to a power supply.

[0052] When the power supply is operating normally, the energy storage capacitor C is charged with energy. When the power supply is lost, a circuit is formed by the normally open contact ZJ2 of the intermediate relay, the energy storage capacitor C and the tripping coil of the medium and high voltage circuit breaker. The energy storage capacitor C is discharged to trip the medium and high voltage circuit breaker.

[0053] See also Figure 4 In some embodiments, the other end of the energy storage capacitor C is connected to the power supply through a diode D, the anode of the diode D is connected to the power supply, and the cathode of the diode D is connected to the energy storage capacitor C.

[0054] The energy storage capacitor C is connected to the power supply through the diode D. By utilizing the single-phase conduction of the diode D, the energy storage capacitor C can be charged when the power supply is normal. When the power supply fails, due to the unidirectional conduction characteristic of the diode D, the charge released by the energy storage capacitor C cannot pass through the diode D, and the charge released by the energy storage capacitor C is sent to the tripping coil KC of the medium and high voltage circuit breaker, ensuring that the medium and high voltage circuit breaker can trip normally when the power supply fails.

[0055] In other embodiments, the energy storage element P may also be an energy storage battery. Under normal power supply, the normally open contact ZJ2 of the intermediate relay is in a disconnected state, and the energy storage battery will not discharge the trip coil KC of the medium and high voltage circuit breaker. When the mains power is on, the normally open contact ZJ2 of the intermediate relay is connected, so that the energy storage battery can discharge the trip coil KC of the medium and high voltage circuit breaker. The energy storage battery may be a solar cell, a rechargeable battery, a dry cell, etc.

[0056] In some embodiments, the switch TA is a push button switch. A push button switch, also known as a control button (referred to as a button), is a low-voltage electrical appliance that is manually and generally automatically reset. A button is generally used in a circuit to issue a start or stop command to control the connection and disconnection of the coil current of an electrical appliance such as an electromagnetic starter, a contactor, or a relay. In other embodiments, the switch TA may also be a self-resetting switch of other types.

[0057] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A medium and high voltage circuit breaker automatic tripping circuit when power is lost, characterized in that: Including energy storage elements and intermediate relays: An energy storage element, one end of which is connected to one end of the trip coil of the medium- and high-voltage circuit breaker, and the other end of which is connected to the other end of the coil of the high-voltage relay through the normally open contact of the intermediate relay; One end of the coil of the intermediate relay is connected to one end of the power supply, and the other end of the intermediate relay is connected to the other end of the power supply.

2. The medium and high voltage circuit breaker power failure automatic tripping circuit according to claim 1 is characterized in that: The energy storage element is an energy storage capacitor, and the other end of the energy storage capacitor is connected to a power supply.

3. The medium and high voltage circuit breaker power failure automatic tripping circuit according to claim 2 is characterized in that: The other end of the energy storage capacitor is connected to the power supply through a diode, the anode of the diode is connected to the power supply, and the cathode of the diode is connected to the energy storage capacitor.

4. A power supply system, characterized in that: Including power supply, switch, medium and high voltage circuit breaker and medium and high voltage circuit breaker power failure automatic tripping circuit; One end of the trip coil of the medium and high voltage circuit breaker is connected to the power supply through a switch; The medium and high voltage circuit breaker power failure automatic tripping circuit includes an energy storage element and an intermediate relay; An energy storage element, one end of which is connected to one end of the trip coil of the medium- and high-voltage circuit breaker, and the other end of which is connected to the other end of the coil of the medium- and high-voltage circuit breaker through the normally open contact of the intermediate relay; One end of the coil of the intermediate relay is connected to one end of the power supply, and the other end of the intermediate relay is connected to the other end of the power supply.

5. The power supply system according to claim 4, characterized in that: The energy storage element is an energy storage capacitor, and the other end of the energy storage capacitor is connected to a power supply.

6. The power supply system according to claim 5, characterized in that: The other end of the energy storage capacitor is connected to the power supply through a diode, the anode of the diode is connected to the power supply, and the cathode of the diode is connected to the energy storage capacitor.

7. The power supply system according to claim 4, characterized in that: The switch is a push button switch.

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