Circuit protection system and electronic equipment
Through the design circuit protection system, the zero -sequential current protection module is used to detect the failure of the power consumption module and disconnect the connection, which solves the problem that the neutral point non -grounding system cannot automatically discover the fault signal. damage.
Patent Information
- Application Number
- CN202411418116.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-01-28
AI Technical Summary
The neutral point ungrounded system cannot automatically detect the fault signal when there is a fault, causing the accident to expand, affecting the previous level of protection, and burning the equipment in serious cases.
A circuit protection system is designed, including electric modules and zero -sequential current protection modules. The box -type substation of the box -type substation of the power consumption module and the neutral point non -grounding system is connected. The zero -sequential current protection module is used to detect the failure of the power consumption module, and the power consumption module is disconnected from the bare line of the box -type substation to protect other power consumption. Module.
When the power consumption module is faulty, the fault protection is automatically protected, the disconnection of the connection between the electric module and the box of the box -type substation, avoiding the expansion of the accident and the damage of the equipment. ability.
Smart Images
Figure CN119382036A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of circuit technology, and in particular to a circuit protection system and electronic equipment. Background Art
[0002] The Neutral Point Unearthed System in the power system belongs to the low-current grounding system. The Neutral Point Unearthed System is a configuration method of the power system, in which the neutral point of the power system (usually the center point of the three-phase system) is not directly connected to the earth. Its failure has little effect on the stability of the system, and when a system failure occurs, the system line voltage is symmetrical and allowed to run for 1-2 hours.
[0003] At present, zero-sequence voltage protection is mainly used for circuit protection of ungrounded neutral point systems. Specifically, zero-sequence voltage is used as a protection signal, and an insulation monitoring device or a grounding line selection device is used to detect single-phase grounding faults. In the event of a fault, the operator can find the grounded line by disconnecting the lines one by one.
[0004] However, when using this circuit protection method, in the event of a fault in the neutral point ungrounded system, it is necessary to rely on the operating personnel to promptly discover the fault and handle it. The neutral point ungrounded system cannot detect the fault signal, and thus cannot take action based on the fault signal, causing the accident to expand, affecting the upper level of protection, and in severe cases burning the equipment. Summary of the invention
[0005] In view of this, the present application provides a circuit protection system and electronic equipment, the main purpose of which is to improve the technical problem that the current existing technology of ungrounded neutral point system cannot detect fault signals, and thus cannot take action on the fault signals, causing the accident to expand, affecting the upper level protection, and in serious cases burning the equipment.
[0006] In a first aspect, the present application provides a circuit protection system, comprising: a power consumption module and a zero-sequence current protection module;
[0007] The first end of the power module is connected to the busbar of the box-type substation in the neutral point ungrounded system, the second end of the power module is connected to the first end of the zero-sequence current protection module, the third end of the power module is connected to the second end of the zero-sequence current protection module, and the fourth end of the power module is connected to the power equipment;
[0008] The zero-sequence current protection module is used to control the power module to disconnect from the box-type substation busbar when a fault is detected in the power module, so as to protect other power modules connected to the box-type substation busbar.
[0009] Optionally, the zero-sequence current protection module includes a zero-sequence current transformer and a microcomputer protection device;
[0010] The first end of the zero-sequence current transformer is connected to the third end of the power consumption module, and the second end of the zero-sequence current transformer is connected to the first end of the microcomputer protection device.
[0011] Optionally, the zero-sequence current transformer is used to detect the power module when a fault occurs in the power module;
[0012] The zero-sequence current transformer is also used to adjust the zero-sequence current according to a predetermined transformation ratio when it is detected that the power module generates a zero-sequence current, and to reflect the adjusted zero-sequence current to the microcomputer protection device.
[0013] Optionally, the zero-sequence current protection module further includes a tripping coil;
[0014] The second end of the microcomputer protection device is connected to the first end of the trip coil, and the second end of the trip coil is connected to the second end of the power module.
[0015] Optionally, the microcomputer protection device is used to trigger a protection action and control the tripping coil to trip when the adjusted zero-sequence current reflected by the zero-sequence current transformer is detected.
[0016] Optionally, the tripping coil is used to disconnect the power-consuming module from the busbar of the box-type substation after tripping, so as to protect other power-consuming modules connected to the busbar of the box-type substation.
[0017] Optionally, the power module includes an isolating switch and a circuit breaker;
[0018] The first end of the isolating switch is connected to the busbar of the box-type substation, and the second end of the isolating switch is connected to the first end of the circuit breaker;
[0019] The second end of the circuit breaker is connected to the second end of the trip coil, and the third end of the circuit breaker is connected to the electrical equipment through a cable.
[0020] Optionally, the circuit breaker is used to disconnect the power-consuming module from the busbar of the box-type substation when the trip coil trips, so as to protect other power-consuming modules connected to the busbar of the box-type substation.
[0021] In a second aspect, the present application provides an electronic device, comprising the circuit protection system described in the first aspect.
[0022] By means of the above technical scheme, the present application provides a circuit protection system and an electronic device, wherein the power protection system comprises: a power consumption module and a zero-sequence current protection module; the first end of the power consumption module is connected to the busbar of a box-type substation in a neutral point ungrounded system, the second end of the power consumption module is connected to the first end of the zero-sequence current protection module, the third end of the power consumption module is connected to the second end of the zero-sequence current protection module, and the fourth end of the power consumption module is connected to the power consumption equipment; the zero-sequence current protection module is used to control the power consumption module to disconnect from the box-type substation busbar when a fault is detected in the power consumption module, so as to protect other power consumption modules connected to the box-type substation busbar. Compared with the current existing technology, the present application connects the power-consuming module with the zero-sequence current protection module. When the zero-sequence current protection module detects a fault in the power-consuming module, it controls the power-consuming module to be disconnected from the busbar of the box-type substation to protect other power-consuming modules connected to the busbar of the box-type substation. When a fault occurs in the power-consuming module, fault protection can be automatically performed to disconnect the connection between the power-consuming module and the busbar of the box-type substation. There is no need to rely on operating personnel to discover the fault and then deal with it. Fault protection can be performed in time for unmanned substations and open-pit coal mines with poor working environment and underdeveloped communications to avoid the expansion of accidents, affecting the upper-level protection, and burning equipment in serious cases. The normal operation of the neutral point non-grounded system can be guaranteed to a greater extent. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] 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 present application.
[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0025] Figure 1 A schematic diagram of the structure of a circuit protection system provided by an embodiment of the present application is shown;
[0026] Figure 1 middle:
[0027] 1-power module, 11-isolating switch, 12-circuit breaker;
[0028] 2-zero-sequence current protection module, 21-zero-sequence current transformer, 22-microcomputer protection device, 23-tripping coil. DETAILED DESCRIPTION
[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0032] The embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.
[0033] Combine the following Figure 1 A circuit protection system according to some embodiments of the present application is described.
[0034] The present application provides a circuit protection system, such as Figure 1 As shown, it includes: a power module 1 and a zero-sequence current protection module 2; the first end of the power module 1 is connected to the busbar of the box-type substation in the neutral point ungrounded system, the second end of the power module 1 is connected to the first end of the zero-sequence current protection module 2, the third end of the power module 1 is connected to the second end of the zero-sequence current protection module 2, and the fourth end of the power module 1 is connected to the power equipment; the zero-sequence current protection module 2 is used to control the power module to disconnect from the box-type substation busbar when a fault is detected in the power module, so as to protect other power modules connected to the box-type substation busbar.
[0035] In an embodiment of the present application, a neutral point ungrounded system is a configuration mode of an electric power system, in which the neutral point of the electric power system (usually the center point of a three-phase system) is not directly connected to the earth. Exemplarily, in a three-phase AC power system, the neutral point can be a common connection point of the three-phase windings. A neutral point grounded system refers to connecting the neutral point directly to the earth, while a neutral point ungrounded system does not directly connect the neutral point to the earth.
[0036] In some examples, in a neutral point ungrounded system, when a single-phase grounding fault occurs, the fault current flowing is relatively small because no complete loop is formed. When a single-phase grounding fault occurs, the voltage of the non-fault phase will rise to the level of the line voltage, which places higher requirements on the insulation of the equipment. Since the current during a single-phase grounding fault is small, fault detection becomes more difficult and requires special detection methods. The neutral point ungrounded system can continue to operate for a period of time during a single-phase grounding fault, which improves the stability of the system and reduces the damage to the equipment caused by the large current caused by the single-phase grounding fault.
[0037] For the embodiments of the present application, the box-type substation busbar or box-type transformer busbar (Distribution Box or Transformer Substation Busbar) refers to the main conductor installed inside the distribution box or transformer substation for distributing electricity. The function of the box-type transformer busbar is to distribute electricity from the high-voltage side to the low-voltage side inside the box-type transformer, or from the power supply to each load device. Specifically, the box-type transformer busbar can distribute electricity from the high-voltage side to the low-voltage side, or distribute electricity from the power supply to each load device. It can also bring together the currents of multiple power supplies or generators, and protect electrical equipment from overcurrent and short circuit by using it in conjunction with protective equipment (such as circuit breakers and fuses). Current transformers (CT) and voltage transformers (PT) are usually installed on the box-type transformer busbar to measure and monitor current and voltage.
[0038] As an alternative, zero sequence current is a special current component in the power system, which plays an important role in the fault analysis, protection and monitoring of the power system. The existence of zero sequence current usually means that there is some form of asymmetric fault or ground fault in the system.
[0039] Furthermore, situations where zero-sequence current is generated may include the following, but are not limited to these, for example: 1. In a single-phase grounding fault, when a short circuit occurs between one phase in the power system and the earth, a zero-sequence current will be generated. 2. In a two-phase grounding fault, when a short circuit occurs between the two phases and the earth at the same time, a zero-sequence current will also be generated. 3. In a system with a direct grounding of the neutral point, a single-phase grounding fault will cause a zero-sequence current to flow through the neutral line. 4. In a system with an ungrounded neutral point, when a single-phase grounding fault occurs, the zero-sequence current is small, but it can still form a loop through the earth. It should be noted that the present application is based on the zero-sequence current to determine whether there is a fault in a neutral point ungrounded system. For a neutral point ungrounded system with a fault, it is necessary to use a zero-sequence current transformer. When it is detected that the zero-sequence current exceeds the set threshold, the protection relay will operate to cut off the fault circuit.
[0040] In some examples, zero sequence current protection is a common relay protection technology in power systems, mainly used to detect and remove single-phase grounding faults. This protection method is particularly suitable for power systems with ungrounded neutral points or grounded via arc suppression coils, because in these systems, the fault current of single-phase grounding faults is relatively small and difficult to detect by conventional overcurrent protection.
[0041] In an embodiment of the present application, it is determined whether there is a fault in the power module by detecting the zero-sequence current of the power module, and when it is determined that there is a fault in the power module, the power module is controlled to be disconnected from the busbar of the box-type substation to protect other power modules connected to the busbar of the box-type substation.
[0042] It should be noted that the busbar of a box-type substation can be connected to multiple power modules, and each power module can be connected to a zero-sequence current protection module. Among the multiple power modules connected to the busbar of the box-type substation, if one or several power modules fail, the zero-sequence current protection module corresponding to the faulty power module can be used to cut off the connection between the faulty power module and the busbar of the box-type substation, thereby ensuring the normal operation of other power modules connected to the busbar of the box-type substation.
[0043] Compared with the current existing technology, this embodiment connects the power module with the zero-sequence current protection module. When the zero-sequence current protection module detects a fault in the power module, it controls the power module to be disconnected from the box-type substation bus to protect other power modules connected to the box-type substation bus. When a fault occurs in the power module, fault protection can be automatically performed to disconnect the power module from the box-type substation bus. There is no need to rely on operating personnel to discover the fault and then deal with it. Fault protection can be performed in time for unmanned substations and open-pit coal mines with poor working environment and underdeveloped communications to avoid the expansion of accidents, affecting the upper level protection, and burning equipment in serious cases. The normal operation of the neutral point non-grounded system can be guaranteed to a greater extent, and the risk resistance of the neutral point fault grounding system can be improved.
[0044] Optionally, the zero-sequence current protection module 2 includes a zero-sequence current transformer 21 and a microcomputer protection device 22; the first end of the zero-sequence current transformer 21 is connected to the third end of the power module 1, and the second end of the zero-sequence current transformer 21 is connected to the first end of the microcomputer protection device 22.
[0045] In the embodiment of the present application, a zero sequence current transformer (ZCT) is a device specifically used to detect zero sequence current in a power system. Specifically, under normal circumstances, the three-phase current is balanced and the zero sequence current is zero. When a single-phase grounding fault occurs in the system, the three-phase current is no longer balanced and a zero sequence current appears. The zero sequence current transformer detects the vector sum of the three-phase currents through formula 1, and formula 1 is specifically as follows:
[0046] I_0=I_a+I_b+I_c (Formula 1)
[0047] In formula 1, I_a, I_b and I_c represent the three-phase currents respectively.
[0048] Optionally, the zero-sequence current transformer 21 is used to detect the power module 1 when a fault occurs in the power module 1; the zero-sequence current transformer 21 is also used to adjust the zero-sequence current according to a predetermined transformation ratio when it is detected that the power module 1 generates a zero-sequence current, and to reflect the adjusted zero-sequence current to the microcomputer protection device 22.
[0049] Furthermore, when the three-phase current is balanced, the zero-sequence current is zero, and there is no current in the secondary winding of the transformer. When a single-phase grounding fault occurs, a zero-sequence current appears, and a current is generated in the secondary winding of the transformer. The current in the secondary winding is transmitted through a cable to a protective relay or other monitoring device, that is, the microcomputer protection device 22 in the present application. When the detected zero-sequence current exceeds a preset value, the protective relay is activated, triggering corresponding protection measures, such as cutting off the fault circuit.
[0050] Optionally, the zero-sequence current protection module 2 further includes a tripping coil 23 ; the second end of the microcomputer protection device 22 is connected to the first end of the tripping coil 23 , and the second end of the tripping coil 23 is connected to the second end of the power module 1 .
[0051] In some examples, the microcomputer protection device 22 is used to trigger a protection action and control the tripping coil to trip when the adjusted zero-sequence current reflected by the zero-sequence current transformer 21 is detected.
[0052] For this embodiment, the microprocessor-based protection device is a relay protection device based on microprocessor technology, which is used to detect faults in the power system and take prompt measures when a fault occurs to protect the safety of power equipment and systems. Specifically, the microprocessor protection device collects electrical parameters such as current, voltage, frequency, etc. in the neutral point ungrounded system, and analyzes and processes them through a built-in algorithm. When an abnormal situation (such as overcurrent, short circuit, ground fault, etc.) is detected, the device will trigger a corresponding protection action, such as cutting off the power supply or issuing an alarm.
[0053] Optionally, the tripping coil is used to disconnect the power-consuming module from the busbar of the box-type substation after tripping, so as to protect other power-consuming modules connected to the busbar of the box-type substation.
[0054] Furthermore, the tripping coil is a key component used to control circuit breakers or other switching devices in the power system. When a fault occurs in the power system, the tripping coil activates the circuit breaker through electromagnetic action, thereby cutting off the faulty circuit and protecting the safety of the power equipment and system. Specifically, when a protection device (such as a relay, a microcomputer protection device, etc.) detects a fault in the power system (such as overcurrent, short circuit, ground fault, etc.), an electrical signal is sent to the tripping coil. This electrical signal generates a magnetic field in the tripping coil, thereby driving the mechanical mechanism to operate, causing the contacts of the circuit breaker to separate and cut off the circuit.
[0055] Correspondingly, after receiving the electrical signal sent by the microcomputer protection device 22, the trip coil 23 in the embodiment of the present application will control the power module 1 to disconnect from the box-type substation bus to protect other power modules connected to the box-type substation bus.
[0056] Optionally, the power module 1 includes an isolating switch 11 and a circuit breaker 12; the first end of the isolating switch 11 is connected to the busbar of the box-type substation, and the second end of the isolating switch 11 is connected to the first end of the circuit breaker 12; the second end of the circuit breaker 12 is connected to the second end of the tripping coil 23, and the third end of the circuit breaker 12 is connected to the power equipment through a cable.
[0057] In the embodiment of the present application, an isolating switch (Isolating Switch or Isolator) is a switch device used in a power system, which is mainly used to ensure that the electrical equipment is completely isolated from the live parts when the electrical equipment is repaired or replaced, thereby ensuring the safety of the staff. Specifically, the isolating switch cuts off the circuit by disconnecting the contacts (usually the static contact and the moving contact). In the disconnected state, there is a sufficient air gap between the contacts of the isolating switch to ensure that no breakdown occurs even under high voltage.
[0058] Optionally, the circuit breaker 12 is used to disconnect the power module 1 from the busbar of the box-type substation when the trip coil 23 trips, so as to protect other power modules connected to the busbar of the box-type substation.
[0059] In some examples, a circuit breaker is an important device used to control and protect circuits in power systems. The circuit breaker can close, carry and disconnect current under normal conditions, and when a circuit fault occurs (such as a short circuit, overload, ground fault, etc.), it can quickly cut off the current to prevent the accident from expanding. Specifically, the circuit breaker closes and disconnects the circuit through mechanical mechanisms and electromagnetic effects. When a fault current is detected, the protection mechanism inside the circuit breaker (such as an overcurrent release) will trigger the circuit breaker to operate and quickly cut off the current.
[0060] It should be noted that, in the present application, when a single-phase grounding fault occurs in a cable or coupler, a dedicated transformer senses the zero-sequence current and reacts to the protection device, which causes the circuit breaker to trip, disconnecting the faulty line and protecting the non-faulty line.
[0061] Exemplarily, examples of load shovel, hydraulic shovel, drilling rig cable and cable coupler failures carried by the left and right ring box transformers of the power supply section after zero-sequence current protection is activated may include but are not limited to the following, as shown in Table 1 below:
[0062] Table 1
[0063]
[0064] It should be noted that the zero-sequence current of a system with an ungrounded neutral point is very small during a fault. This application utilizes a dedicated zero-sequence current transformer in conjunction with a sensitive protection device, requiring that the zero-sequence current setting range of the protection device be between 0.02-12A, and that the transformation ratio of the zero-sequence current transformer be as small as possible to ensure that the zero-sequence secondary current that can be collected during a fault is as large as possible.
[0065] In the prior art, the power system with ungrounded neutral point belongs to a small current grounding system, and its fault has little effect on the stability of the system. Moreover, when a fault occurs in the system, the system line voltage is symmetrical and allowed to run for 1-2 hours. Most of them configure current protection as the main protection, or use zero-sequence voltage protection as a signal, and cooperate with insulation monitoring devices or grounding line selection devices to detect single-phase grounding faults. The operating personnel can find the grounded line by disconnecting the lines one by one. Using this method, the operating personnel cannot find the fault alarm in time, cannot remove the faulty equipment in time, and there will be problems such as inaccurate line selection of the grounding line selection device and easy false operation of the zero-sequence voltage protection. For unmanned substations and open-pit coal mines with poor working environment and underdeveloped communications, the operating personnel cannot find the fault signal in time and cannot withdraw the faulty equipment from the operating system in time, resulting in the expansion of the accident, affecting the upper level protection, and burning the equipment in serious cases.
[0066] Compared with the current existing technology, this embodiment connects the power module with the zero-sequence current protection module. When the zero-sequence current protection module detects a fault in the power module, it controls the power module to be disconnected from the box-type substation bus to protect other power modules connected to the box-type substation bus. When a fault occurs in the power module, fault protection can be automatically performed to disconnect the power module from the box-type substation bus. There is no need to rely on operating personnel to discover the fault and then deal with it. For unmanned substations and open-pit coal mines with poor working environment and underdeveloped communications, fault protection can be performed in time to avoid the expansion of accidents, affecting the upper-level protection, and burning equipment in serious cases. The normal operation of the neutral point non-grounded system can be guaranteed to a greater extent, and the risk resistance of the neutral point fault grounding system can be improved.
[0067] Based on the above Figure 1 The system shown in the embodiment of the present application also provides an electronic device, such as a smart phone, a tablet computer, a drone, an intelligent robot, a wearable smart terminal, etc., the device includes Figure 1 The system shown.
[0068] Optionally, the above-mentioned physical device may also include a user interface, a network interface, a camera, a radio frequency (RF) circuit, a sensor, an audio circuit, a WI-FI module, etc. The user interface may include a display, an input unit such as a keyboard, etc., and the optional user interface may also include a USB interface, a card reader interface, etc. The network interface may optionally include a standard wired interface, a wireless interface (such as a WI-FI interface), etc.
[0069] Those skilled in the art will appreciate that the above-mentioned physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or a combination of certain components, or different arrangements of components.
[0070] Based on the above Figure 1 The system shown in the embodiment further provides a chip, including one or more interface circuits and one or more processors; the interface circuit is used to receive a signal from a memory of an electronic device and send the signal to the processor, the signal including a computer instruction stored in the memory; when the processor executes the computer instruction, the electronic device includes the above-mentioned Figure 1 The system shown.
[0071] Through the description of the above implementation methods, the technicians in this field can clearly understand that the present application can be implemented by means of software plus the necessary general hardware platform, or by hardware. By applying the scheme of this embodiment, compared with the current prior art, this embodiment connects the power module with the zero-sequence current protection module, and controls the power module to disconnect from the box-type substation busbar when the zero-sequence current protection module detects that the power module has a fault, so as to protect other power modules connected to the box-type substation busbar. In the case of a fault in the power module, fault protection can be automatically performed, and the connection between the power module and the box-type substation busbar is disconnected. There is no need to rely on the operating personnel to find the fault and then deal with it. For unmanned substations and open-pit coal mines with poor working environment and underdeveloped communication, fault protection can be performed in time to avoid the expansion of accidents, affecting the upper level protection, and burning equipment in serious cases. The normal operation of the neutral point non-grounded system can be guaranteed to a greater extent, and the risk resistance of the neutral point fault grounding system can be improved.
[0072] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0073] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features applied for herein.
Claims
1. A circuit protection system, characterized in that: include: Power consumption module and zero-sequence current protection module; The first end of the power module is connected to the busbar of the box-type substation in the neutral point ungrounded system, the second end of the power module is connected to the first end of the zero-sequence current protection module, the third end of the power module is connected to the second end of the zero-sequence current protection module, and the fourth end of the power module is connected to the power equipment; The zero-sequence current protection module is used to control the power module to disconnect from the box-type substation busbar when a fault is detected in the power module, so as to protect other power modules connected to the box-type substation busbar.
2. The system according to claim 1, characterized in that The zero-sequence current protection module includes a zero-sequence current transformer and a microcomputer protection device; The first end of the zero-sequence current transformer is connected to the third end of the power consumption module, and the second end of the zero-sequence current transformer is connected to the first end of the microcomputer protection device.
3. The system according to claim 2, characterized in that The zero-sequence current transformer is used to detect the power module when a fault occurs in the power module; The zero-sequence current transformer is also used to adjust the zero-sequence current according to a predetermined transformation ratio when it is detected that the power module generates a zero-sequence current, and to reflect the adjusted zero-sequence current to the microcomputer protection device.
4. The system according to claim 3, characterized in that The zero-sequence current protection module also includes a trip coil; The second end of the microcomputer protection device is connected to the first end of the trip coil, and the second end of the trip coil is connected to the second end of the power module.
5. The system according to claim 4, characterized in that The microcomputer protection device is used to trigger a protection action and control the tripping coil to trip when the adjusted zero-sequence current reflected by the zero-sequence current transformer is detected.
6. The system according to claim 5, characterized in that The tripping coil is used to disconnect the power-consuming module from the busbar of the box-type substation after tripping, so as to protect other power-consuming modules connected to the busbar of the box-type substation.
7. The system according to claim 6, characterized in that The power consumption module includes an isolating switch and a circuit breaker; The first end of the isolating knife switch is connected to the busbar of the box-type substation, and the second end of the isolating knife switch is connected to the first end of the circuit breaker.
8. The system according to claim 7, characterized in that The second end of the circuit breaker is connected to the second end of the trip coil, and the third end of the circuit breaker is connected to the electrical equipment through a cable.
9. The system according to claim 8, characterized in that The circuit breaker is used to disconnect the power-consuming module from the busbar of the box-type substation when the tripping coil is tripped, so as to protect other power-consuming modules connected to the busbar of the box-type substation.
10. An electronic device comprising the system according to any one of claims 1 to 9.