A high voltage switching system for a high voltage circuit
By introducing a time-delay component into the high-voltage switch system, the problem of instantaneous tripping during voltage fluctuations in the high-voltage switch system was solved, achieving delayed tripping, reducing the risk of large-scale power outages in the mine, and ensuring safe production in the mine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGXIA BAOFENG ENERGY GROUP CO LTD
- Filing Date
- 2025-08-27
- Publication Date
- 2026-08-04
AI Technical Summary
The existing high-voltage switch system lacks a delay function when the voltage fluctuates, which causes the undervoltage release device to trip instantaneously, resulting in a safety hazard of large-scale power outages in the mine.
Design a high-voltage switch system comprising a conductive device, an arc-extinguishing device, and an operating mechanism, wherein the undervoltage tripping device in the operating mechanism is connected in parallel with a time-delay component, including a time-delay capacitor or a time-delay relay, for tripping after a delay when the voltage is lower than a preset voltage.
The delayed tripping function reduces the possibility of large-scale power outages in mines, ensures safe production in mines, provides time for subsequent operations, and avoids short circuits and leakage.
Smart Images
Figure CN224595440U_ABST
Abstract
Description
Technical Field
[0001] This application generally relates to the field of coal mining technology. More specifically, this application relates to a high-voltage switching system for high-voltage circuits. Background Technology
[0002] A high-voltage switchgear system is a complete set of switchgear with a rated voltage of 3kV and above, used for connecting, carrying, disconnecting, or isolating high-voltage circuits. It integrates circuit breakers, disconnecting switches, instrument transformers, busbars, protection systems, control systems, interlocking systems, and enclosures into a single unit. It can supply power normally and automatically trip in case of faults such as short circuits, overloads, undervoltage, and leakage, while meeting safety requirements such as explosion-proof and anti-misoperation measures.
[0003] In existing technologies, common underground high-voltage switchgear systems in coal mines can include 10kV high-voltage switchgear systems. These systems distribute 10kV power from surface 35kV substations to central substations, mining area substations, mobile substations, and then to coal mining machines, tunneling machines, main drainage pumps, belt conveyors, etc. The 10kV high-voltage switchgear system can be linked with methane sensors and wind speed sensors: when methane levels exceed limits or local ventilation fans stop operating, the high-voltage switchgear system automatically cuts off power to prevent electrical sparks from igniting the methane. Furthermore, when cables are damaged, insulation breaks down, or internal equipment malfunctions, the 10kV high-voltage switchgear system can trip promptly to prevent the accident from escalating. Similarly, it can trip promptly in the event of widespread voltage dips or voltage drops to prevent multiple motors from burning out. However, existing high-voltage switch systems generally do not have a delay function during the undervoltage tripping process. When the voltage fluctuation is too large and the voltage drops to the release voltage of the undervoltage tripping device of the high-voltage switch system, the undervoltage tripping device will trip instantaneously, causing safety hazards such as large-scale power outages in the mine.
[0004] In view of this, there is an urgent need to provide a high-voltage switching system for high-voltage circuits, so that when faced with a voltage lower than the release voltage of the undervoltage release device, the undervoltage release device can trip with a delay, thereby reducing the possibility of large-scale power outages in mines. Utility Model Content
[0005] In order to at least solve one or more of the technical problems mentioned above, this application proposes a high-voltage switching system for high-voltage circuits in one aspect.
[0006] In a first aspect, this application provides a high-voltage switching system for a high-voltage circuit, the high-voltage switching system comprising a conductive device, an arc-extinguishing device, and an operating mechanism; wherein the conductive device comprises a stationary contact and a moving contact detachably connected to the stationary contact, the conductive device being used to realize the switching of the high-voltage switching system; the arc-extinguishing device being used to extinguish the electric arc generated when the stationary contact and the moving contact separate; the operating mechanism being used to provide power to drive the stationary contact and the moving contact to contact, wherein the operating mechanism includes an undervoltage release device, the undervoltage release device being disposed within the operating mechanism being used to trigger the operating mechanism to separate the stationary contact and the moving contact when the voltage of the high-voltage circuit is lower than a preset voltage, wherein the undervoltage release device includes an undervoltage coil, the undervoltage coil being connected in parallel with a time-delay component to realize time-delay protection of the high-voltage switching system.
[0007] In some embodiments, the delay component includes a delay capacitor and a delay resistor connected in series.
[0008] In some embodiments, the high-voltage switch system further includes an insulation system for preventing short circuits or leakage in the high-voltage switch system.
[0009] In some embodiments, the conductive device further includes a first conductive rod and a second conductive rod, one end of the first conductive rod being connected to the stationary contact and the other end of the first conductive rod being connected to the external circuit of the high-voltage switch system, one end of the second conductive rod being connected to the moving contact and the other end of the second conductive rod being connected to the external circuit of the high-voltage switch system.
[0010] In some embodiments, the arc extinguishing device includes an arc extinguishing chamber, in which the stationary contact and the moving contact are disposed, and the arc extinguishing chamber is used to provide an environment for extinguishing the electric arc generated when the stationary contact and the moving contact separate.
[0011] In some embodiments, the operating mechanism includes a transmission mechanism for transmitting power to the moving contact.
[0012] In some embodiments, the operating mechanism further includes a spring mechanism connected to the moving contact for controlling the movement of the moving contact.
[0013] With the high-voltage switching system for high-voltage circuits provided above, the solution of this application enables the undervoltage release device to trip with a delay when the voltage is lower than the release voltage of the undervoltage release device, thereby reducing the possibility of large-scale power outages in mines. Attached Figure Description
[0014] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein: Figure 1 Exemplary block diagrams of high-voltage switching systems for high-voltage circuits according to some embodiments of this application are shown; Figure 2 Exemplary circuit diagrams of high-voltage switching systems for high-voltage circuits according to other embodiments of this application are shown. Detailed Implementation
[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0016] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.
[0017] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.
[0018] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."
[0019] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0020] Figure 1 Exemplary block diagrams of high-voltage switching systems for high-voltage circuits according to some embodiments of this application are shown; Figure 2 Exemplary circuit diagrams of high-voltage switching systems for high-voltage circuits, representing other embodiments of this application, are shown. (See diagram for example.) Figure 1 and Figure 2 As shown, the high-voltage switch system includes a conductive device, an arc-extinguishing device, and an operating mechanism. The conductive device includes a stationary contact and a moving contact detachably connected to the stationary contact, and is used to switch the high-voltage switch system on and off. The arc-extinguishing device is used to extinguish the electric arc generated when the stationary contact and the moving contact separate. The operating mechanism provides the power to drive the stationary contact and the moving contact into contact. The operating mechanism includes a voltage-loss release device, which is disposed within the operating mechanism and is used to trigger the operating mechanism to separate the stationary contact and the moving contact when the voltage of the high-voltage circuit is lower than a preset voltage. The voltage-loss release device includes a voltage-loss coil connected in parallel with a time-delay component to achieve time-delay protection for the high-voltage switch system.
[0021] In some embodiments, the conductive device further includes a first conductive rod and a second conductive rod, one end of the first conductive rod being connected to the stationary contact and the other end of the first conductive rod being connected to the external circuit of the high-voltage switch system, one end of the second conductive rod being connected to the moving contact and the other end of the second conductive rod being connected to the external circuit of the high-voltage switch system.
[0022] In some embodiments, the operating mechanism further includes a spring mechanism connected to the moving contact for controlling the movement of the moving contact.
[0023] In some embodiments, the conductive device may include a stationary contact and a moving contact. It is understood that when the stationary contact and the moving contact are in contact, the circuit may be in a connected state, and when the stationary contact and the moving contact are in contact, the circuit may be in a disconnected state.
[0024] In some embodiments, the stationary contact can be fixed to the body of the high-voltage switch system or the arc-extinguishing chamber housing of the arc-extinguishing device, and its position is immovable. Further, the stationary contact can be a flat plate type, which can be a flat or curved metal plate, and its surface can be plated with silver or a silver alloy. The stationary contact can also be a plum blossom type stationary contact, which consists of multiple elastic contact fingers (e.g., 6-8 fingers) forming a ring, with a central space reserved for the insertion of the moving contact, and the outer sides of the contact fingers can be clamped by springs. The stationary contact can also be a cup-shaped longitudinal stationary contact, which can have a cup-shaped structure with inclined slots, and the current path is designed as a longitudinal magnetic field to control the high-speed rotation of the arc.
[0025] In some embodiments, the moving contact can be configured to be movable, and can be linked to the operating mechanism via an insulating rod to achieve linear or rotary movement. The moving contact can be a rod-shaped contact, which can be a cylindrical conductive rod with a spherical or conical end, and can be inserted into the stylus fingers of the stationary contact to form contact. The moving contact can also be a cup-shaped moving contact, paired with the stationary contact, and its cup wall has oblique grooves to induce a rotating electric arc in the magnetic field.
[0026] Understandably, since the moving contact is movable, when it moves to the position of contact with the stationary contact, the internal circuit of the high-voltage switch system can be turned on. At this time, current can flow through the stationary contact, then through the contact surface between the stationary and moving contacts to the moving contact, and finally be conducted to the output terminal. When the moving contact moves to the position of separation from the stationary contact, the internal circuit of the high-voltage switch system can be turned off.
[0027] In some embodiments, the conductive device may further include a conductive rod that can connect the aforementioned contacts to an external circuit, thereby enabling current conduction.
[0028] In some embodiments, the arc extinguishing device includes an arc extinguishing chamber, in which the stationary contact and the moving contact are disposed, and the arc extinguishing chamber is used to provide an environment for extinguishing the electric arc generated when the stationary contact and the moving contact separate.
[0029] In some embodiments, the aforementioned stationary and moving contacts can be disposed within the arc-extinguishing chamber. In some embodiments, the arc-extinguishing chamber contains an arc-extinguishing medium, which may include vacuum, SF6 gas, insulating oil, etc., and can utilize the insulating and arc-extinguishing capabilities of the arc-extinguishing medium to block the arc. It is understood that when the moving and stationary contacts separate, the moving contact can detach from the stationary contact at high speed. At this time, a metal vapor arc or a high-temperature plasma arc will be generated between the moving and stationary contacts. It is necessary to extinguish the aforementioned arc; otherwise, the arc may cause problems such as short circuits. The use of an arc-extinguishing chamber and an arc-extinguishing medium can reduce the hazards caused by arcs.
[0030] In some embodiments, the operating mechanism may include an energy storage device, which may include an energy storage spring and an energy storage motor, etc. Further, the energy storage spring may include a closing spring and a opening spring, wherein the closing spring can be used to provide closing power, and the opening spring can be used to provide opening power.
[0031] In some embodiments, the operating mechanism may include a transmission device, which may include a gear set that converts motor speed into high torque, thereby slowly compressing the spring. In some embodiments, the transmission device may include a cam or linkage mechanism that converts the linear / rotational motion of the spring into the linear motion required by the contact. In some embodiments, the aforementioned transmission device may further include a ratchet-lock mechanism that can lock and store energy after the spring is fully compressed.
[0032] In some embodiments, the operating mechanism may further include a pressure-loss release device. It should be understood that when the spring mechanism is in an energy-storing and locked state, it can be pre-energized by compression or tension driven by a motor. This energy is maintained by the locking mechanism, and the moving contact closes with the stationary contact under the spring force, at which point the circuit is connected. Furthermore, at this time, the trip coil of the pressure-loss release device is energized with the rated voltage, and the electromagnetic force attracts the iron core, causing the release device's latch to engage with the spring mechanism's latch, further reinforcing the locked state of the spring mechanism and preventing accidental energy release that could cause the contacts to break.
[0033] When the line loses voltage (e.g., voltage disappears or drops suddenly), the trip coil of the undervoltage release device loses power, the electromagnetic force disappears, and the iron core resets under the action of the spring, causing the release device's latch to disengage. At this time, the spring mechanism's latch is released under the action of the release device, and the energy stored in the closing spring is released instantaneously. This energy drives the aforementioned moving contact and stationary contact to separate through transmission components (e.g., insulating pull rod and crank arm), thereby achieving circuit disconnection.
[0034] In some embodiments, a time-delay component may be connected in parallel across the two ends of the aforementioned undervoltage coil. In some embodiments, the aforementioned time-delay component may include a capacitor. It is understood that by connecting a capacitor in parallel across the two ends of the undervoltage coil, when the line loses voltage (e.g., voltage drops or disappears), if a capacitor is connected in parallel across the two ends of the coil, the capacitor will discharge through the coil, maintain the coil current for a short time, delay the time when the electromagnetic force disappears, thereby delaying the release and tripping action of the iron core, and achieving the function of delayed tripping.
[0035] In some embodiments, the rated voltage of the aforementioned capacitor can be 200 volts, the capacitance can be 3000 microfarads, and the undervoltage delay time can meet the requirement of 3 seconds. Furthermore, the capacitor leads can be fitted with insulating tubing, and the capacitor can be fixedly mounted to avoid affecting the electrical clearance and creepage distance of the switch.
[0036] In some embodiments, the aforementioned delay component may further include a delay relay or a smart protection device. When a voltage loss is detected, the aforementioned delay relay or smart protection device may delay the issuance of a trip signal, thereby enabling delay control.
[0037] It is understandable that the aforementioned high-voltage circuit can be equipped with dual circuits or be powered by multiple power sources, and it can also be connected to an automatic power switching (ATS) system. When the main circuit trips due to loss of voltage, the backup power supply can be quickly put into use to avoid power outages.
[0038] The solution proposed in this application enables the undervoltage release device to trip with a delayed trip when the voltage is lower than its release voltage, allowing time for subsequent operations. Furthermore, by setting up dual circuits or using multiple power sources, switching can be performed within the aforementioned timeframe, thereby preventing large-scale power outages in the mine.
[0039] In some embodiments, the delay component includes a delay capacitor and a delay resistor connected in series.
[0040] In some embodiments, a time-delay capacitor and a time-delay resistor can be connected in parallel and in series across the two ends of the aforementioned undervoltage coil. It is understood that by connecting the time-delay capacitor in parallel across the undervoltage coil, when the line loses voltage (e.g., a sudden drop or disappearance of voltage), the capacitor discharges through the coil, maintaining a short-term current in the coil and delaying the disappearance of the electromagnetic force, thereby delaying the release and tripping action of the iron core, achieving the function of delayed tripping. Furthermore, by connecting the time-delay resistor and the time-delay capacitor in series, a large current can be instantaneously discharged from the capacitor, potentially burning out the coil. Additionally, when the voltage recovers, a discharge path can be provided for the capacitor, preventing residual charge from causing failure to trip.
[0041] In some embodiments, the high-voltage switch system further includes an insulation system for preventing short circuits or leakage in the high-voltage switch system.
[0042] In some embodiments, the insulation system may include an insulating sleeve for supporting the conductive rod and isolating the live part from the housing; the sleeve may be made of ceramic or epoxy resin, etc. The insulation system may also include an insulating pull rod for connecting the operating mechanism and the moving contact, transmitting power while providing mechanical insulation. The insulation system may also include an insulating bracket for securing internal components and ensuring a safe distance between the live part and the grounding frame.
[0043] By setting up an insulation system, it can isolate the current between high-voltage live parts and grounded parts, as well as between different systems, to prevent short circuits or leakage.
[0044] In some embodiments, the operating mechanism includes a transmission mechanism for transmitting power to the moving contact.
[0045] The aforementioned transmission device may include a gear set that converts motor speed into high torque, thereby slowly compressing the spring. In some embodiments, the transmission device may include a cam or linkage mechanism that converts the linear / rotational motion of the spring into the linear motion required by the contact. In some embodiments, the aforementioned transmission device may further include a ratchet-lock mechanism that can lock and store energy after the spring is fully compressed.
[0046] In summary, the solution proposed in this application enables the undervoltage release device to trip with a delayed trip when the voltage is lower than its release voltage, allowing time for subsequent operations. Furthermore, by setting up dual circuits or using multiple power sources, switching can be performed within the aforementioned timeframe, thus preventing large-scale power outages in the mine. This provides effective support for the operation of ventilation and gas extraction equipment in underground mine roadways, thereby ensuring safe production in the mine.
[0047] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.
Claims
1. A high-voltage switching system for high-voltage circuits, characterized in that, The high-voltage switch system includes a conductive device, an arc-extinguishing device, and an operating mechanism; wherein... The conductive device includes a stationary contact and a movable contact that can be detachably connected to the stationary contact. The conductive device is used to realize the switching on and off of the internal circuit of the high-voltage switching system. The arc-extinguishing device is used to extinguish the electric arc generated when the stationary contact and the moving contact separate; The operating mechanism is used to provide power to drive the stationary contact and the moving contact into contact. The operating mechanism includes a de-voltage release device, used to trigger the operating mechanism when the voltage of the high-voltage circuit is lower than a preset voltage, thereby causing the stationary contact and the moving contact to separate. The undervoltage release device includes an undervoltage coil, which is connected in parallel with a time delay component to achieve time delay protection for the high-voltage switch system.
2. The high-voltage switchgear system according to claim 1, characterized in that, The delay component includes a delay capacitor and a delay resistor connected in series.
3. The high-voltage switchgear system according to claim 1, characterized in that, The high-voltage switch system also includes an insulation system to prevent short circuits in the high-voltage switch system.
4. The high-voltage switchgear system according to claim 1, characterized in that, The conductive device further includes a first conductive rod and a second conductive rod. One end of the first conductive rod is connected to the stationary contact, and the other end of the first conductive rod is connected to the external circuit of the high-voltage switch system. One end of the second conductive rod is connected to the moving contact, and the other end of the second conductive rod is connected to the external circuit of the high-voltage switch system.
5. The high-voltage switchgear system according to claim 1, characterized in that, The arc extinguishing device includes an arc extinguishing chamber, in which the stationary contact and the moving contact are disposed. The arc extinguishing chamber is used to provide an environment for extinguishing the electric arc generated when the stationary contact and the moving contact separate.
6. The high-voltage switchgear system according to claim 1, characterized in that, The operating mechanism includes a transmission mechanism for transmitting power to the moving contact.
7. The high-voltage switchgear system according to claim 1, characterized in that, The operating mechanism also includes a spring mechanism connected to the moving contact for controlling the movement of the moving contact.