Novel relay protection device for power distribution network

Abstract

The invention relates to the related technical field of relay protection, in particular to a novel relay protection device for a power distribution network, which comprises an incoming line, and a modular layering mechanism is arranged on the surface of one side of the incoming line. And a current detection device, a voltage detection device, a phase detector, a tripping device, a frequency power detector and an equipment power supply are arranged on the inner side surface of the modular layering mechanism. The device adopts a modular layered design, and compared with a traditional non-modular relay protection device, each instrument is fixed on the support plates of different layers through the fixing angle grooves and the fixing caps, when a certain component breaks down, a maintainer can quickly position the module layer where the fault component is located by opening the front door or the rear door, and the maintenance is convenient. And only the module is overhauled or replaced, and the whole device does not need to be overhauled, so that the maintenance cost is greatly reduced, and meanwhile, the power failure time is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field related to relay protection, and in particular to a novel relay protection device for a power distribution network. Background Art

[0002] In modern power systems, the safe and stable operation of distribution networks is of vital importance. With the continuous growth of power load and the large-scale access of distributed power sources, the structure and operating characteristics of distribution networks have become increasingly complex. With the rapid development of electronic technology and computer technology, digital relay protection devices have gradually become popular. They use the powerful computing and processing capabilities of microprocessors to more quickly and accurately collect and analyze parameters such as voltage and current in power systems. At the same time, more complex protection algorithms can be implemented to improve the accuracy of fault judgment. Although significant progress has been made in relay protection technology, it still faces some challenges. Therefore, there is a special need for a new type of relay protection device for distribution networks.

[0003] However, existing relay protection devices often do not have a modular and hierarchical design when in use. This non-modular structure makes the maintenance and upgrade of the device extremely inconvenient. Once a component fails, the entire device may need to be overhauled, increasing maintenance costs and power outage time. At the same time, the lack of a hierarchical architecture makes the device inefficient in processing fault information at different levels, and it is impossible to effectively perform targeted protection actions based on the severity and impact range of the fault. Summary of the invention

[0004] The object of the present invention is to provide an intelligent power distribution network system and method with fault self-healing capability, so as to solve the problem that the existing relay protection devices proposed in the above background technology often do not have a modular and hierarchical design when in use. This non-modular structure makes the maintenance and upgrading of the device extremely inconvenient. Once a component fails, the entire device may need to be repaired, which increases the maintenance cost and power outage time. At the same time, the lack of a hierarchical architecture makes the device inefficient in processing fault information at different levels, and it is impossible to effectively perform targeted protection actions according to the severity and impact range of the fault.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides an intelligent power distribution network system and method with fault self-healing capability, comprising an incoming line, a modular layered mechanism is provided on one side surface of the incoming line, an outgoing line is provided on one side surface of the modular layered mechanism, a current detection device is provided on the inner side surface of the modular layered mechanism, a voltage detection device is provided on the inner side surface of the modular layered mechanism, a phase detector is provided on the inner side surface of the modular layered mechanism, a tripping device is provided on the inner side surface of the modular layered mechanism, a tripping knife is rotatably connected to one side surface of the tripping device, a frequency power detector is provided on the inner side surface of the modular layered mechanism, and a device supply power supply is provided on the inner side surface of the modular layered mechanism;

[0007] The modular layered mechanism includes a chassis shell, a front hinge, a front door, a hidden handle, a rear hinge, a rear door, a limit strip, a support plate, a fixed angle slot and a fixing cap; one side surface of the incoming line is fixedly connected to the chassis shell, one side surface of the chassis shell is fixedly connected to the front hinge, one side surface of the front hinge is fixedly connected to the front door, one side surface of the front door is fixedly connected to the hidden handle, one side surface of the chassis shell is fixedly connected to the rear hinge, one side surface of the rear hinge is fixedly connected to the rear door, the inner side surface of the chassis shell is fixedly connected to the limit strip, one side surface of the limit strip is snap-connected to the support plate, one side surface of the support plate is slidably connected to the fixed angle slot, and the lower surface of the fixed angle slot is slidably connected to the fixing cap.

[0008] Preferably, the front hinge and the rear hinge are symmetrically arranged in a group on one side surface of the chassis shell, and explosion-proof glass is installed on one side surface of the front door.

[0009] Preferably, the hidden handle pops out after the anti-slip pattern is pressed, making it convenient to open the front door, and four groups of the limit strips are symmetrically arranged around the mid-vertical line of the chassis shell.

[0010] Preferably, the support plate is connected with three groups of upper and lower clamping strips inside the four groups of limit strips, and the clamping strips on the edges of the support plate are relatively raised, which can prevent the support plate from sliding out due to the tilt of the chassis shell.

[0011] Preferably, both sides of the chassis shell and one side surface of the front door are provided with heat dissipation holes for dissipating heat when the instrument is working. The surface of the support plate is provided with multiple groups of holes, which can cooperate with the fixed angle grooves and fixed caps to modularize and layer the instrument and fix it to a certain extent.

[0012] Preferably, the inner side of the fixed angle groove is provided with silicone rubber so as to fit tightly to the surface of the instrument, and the outer surface of the fixed cap is provided with a plurality of groups of anti-slip grooves.

[0013] Preferably, the current detection device and the voltage detection device are arranged above the topmost support plate and are fixed in position by fixing angle grooves and fixing caps. A model indicator light is provided on one side surface of the current detection device and the voltage detection device. When a cable current or voltage fault is detected, the indicator light lights up and the tripping device is controlled to perform adjustment processing to protect the power grid.

[0014] Preferably, the phase detector and the tripping device are arranged above the support plate of the middle layer and fixed in position by fixed angle slots and fixed caps. The phase detector monitors the phase relationship between current and voltage in real time. If a fault occurs, the phase difference changes and the phase detector can issue a warning alarm.

[0015] Preferably, the frequency power detector and the equipment power supply are arranged above the bottom support plate and are fixed in position by fixing angle slots and fixing caps. The frequency power detector monitors the operating frequency of the power grid and the power transmission direction in real time. When an abnormal situation occurs, the frequency power detector and the equipment power supply will control the tripping device to make adjustments to protect the power grid.

[0016] Preferably, a tripping knife is provided on one side surface of the tripping device, and the user can manually control the tripping knife to disconnect the circuit. The power supply for the equipment comes from the power grid. Under normal circumstances, all equipment uses electricity from the power grid. When the power grid fails and the power is cut off, the power supply of the equipment starts to provide power for various instruments.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the novel relay protection device for distribution network, through the setting of modular layered mechanism, the chassis shell of the modular layered mechanism can provide physical protection for the internal instruments, the heat dissipation holes continuously dissipate heat to maintain the normal working temperature, the front door and the rear door can be opened by hidden handles, which is convenient for operators to inspect and maintain the internal modules, and the internal limit strips, support plates, fixed angle grooves and fixed caps ensure that each instrument maintains a stable position and connection state during normal operation and external impact, ensuring the reliable operation of the device. The device adopts a modular layered design. Compared with the traditional non-modular relay protection device, each instrument The device is fixed on the support plates at different levels through the fixing angle slots and fixing caps. When a component fails, the maintenance personnel can quickly locate the module layer where the faulty component is located by opening the front door or the rear door, and only repair or replace the module, without repairing the entire device, which greatly reduces the maintenance cost and the power outage time. When the distribution network fails, such as abnormal increase or decrease of current, voltage fluctuation beyond the normal range, the current detection device and the voltage detection device first detect these abnormal parameter changes, and the corresponding signal indicator lights up to remind the operator of the possible fault, and send the fault signal to the tripping device. If the fault causes the current and voltage to fluctuate, the current detection device and the voltage detection device will detect the abnormal parameter changes first, and the corresponding signal indicator lights up to remind the operator of the possible fault, and send the fault signal to the tripping device. If the phase difference between the two layers changes, the phase detector in the middle layer will quickly detect the change and immediately issue a warning alarm, and at the same time transmit the fault information to the tripping device. If the operating frequency of the power grid fluctuates abnormally or the power transmission direction is abnormal, the frequency and power detector in the bottom layer will detect these problems and transmit the fault signal to the tripping device, and at the same time interact with the power supply of the equipment. After the tripping device receives the fault signal from the current detection device, voltage detection device, phase detector or frequency and power detector, it will make a comprehensive judgment on the severity of the fault based on the built-in protection algorithm and the preset protection strategy. These algorithms will take into account multiple factors, such as fault type, fault duration, etc. , the changing trends of multiple parameters, etc. If it is determined that the power grid needs to be protected to prevent the fault from expanding, the tripping device will be started, driving the tripping knife to make the circuit short-circuited, thereby cutting off the faulty part, effectively isolating the fault, and protecting the normal operation of other parts of the distribution network. In this process, the power supply of the equipment continues to provide power to the key instruments in the device to ensure the smooth completion of the protection action. Due to the layered architecture, detection instruments with different functions are distributed in different layers, which can more effectively perform targeted protection actions according to the severity and impact range of the fault. This layered processing method improves the efficiency of processing fault information at different levels, making the protection action more accurate and timely. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the side appearance structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the cooperation between the mechanisms in the box of the present invention;

[0021] Figure 3 This is a schematic diagram of the outer box and the front and rear doors cooperating with each other in the present invention;

[0022] Figure 4 This is a schematic diagram of the cooperation between the limit strip and the support plate of the present invention;

[0023] Figure 5 This is a schematic diagram of the cooperation between the support plate, the fixed angle groove and the fixed cap of the present invention;

[0024] Figure 6 It is a schematic diagram of the cooperation between the current detection device and the voltage detection device of the present invention;

[0025] Figure 7 It is a schematic diagram of the cooperation between the phase detector and the tripping device of the present invention;

[0026] Figure 8 This is a schematic diagram of the coordination between the frequency power detector and the power supply of the device of the present invention.

[0027] The description of the accompanying drawings is as follows: 1. Incoming line; 2. Modular layered structure; 201. Chassis shell; 202. Front hinge; 203. Front door; 204. Hidden handle; 205. Rear hinge; 206. Rear door; 207. Limit strip; 208. Support plate; 209. Fixed angle groove; 210. Fixed cap; 3. Outgoing line; 4. Current detection device; 5. Voltage detection device; 6. Phase detector; 7. Tripping device; 8. Tripping knife; 9. Frequency and power detector; 10. Equipment power supply. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-8 The present invention provides a technical solution: a novel relay protection device for a power distribution network, comprising an incoming line 1, a modular layered mechanism 2 is arranged on one side surface of the incoming line 1, an outgoing line 3 is arranged on one side surface of the modular layered mechanism 2, a current detection device 4 is arranged on the inner side surface of the modular layered mechanism 2, a voltage detection device 5 is arranged on the inner side surface of the modular layered mechanism 2, a phase detector 6 is arranged on the inner side surface of the modular layered mechanism 2, a tripping device 7 is arranged on the inner side surface of the modular layered mechanism 2, a tripping knife 8 is rotatably connected to one side surface of the tripping device 7, a frequency power detector 9 is arranged on the inner side surface of the modular layered mechanism 2, and an equipment supply power source 10 is arranged on the inner side surface of the modular layered mechanism 2;

[0030] The modular layered mechanism 2 includes a chassis shell 201, a front hinge 202, a front door 203, a hidden handle 204, a rear hinge 205, a rear door 206, a limit strip 207, a support plate 208, a fixed angle slot 209 and a fixed cap 210. One side surface of the incoming line 1 is fixedly connected to the chassis shell 201, one side surface of the chassis shell 201 is fixedly connected to the front hinge 202, one side surface of the front hinge 202 is fixedly connected to the front door 203, one side surface of the front door 203 is fixedly connected to the hidden handle 204, and one side surface of the chassis shell 201 is fixedly connected to The rear hinge 205 is fixedly connected to the rear door 206 on one side surface of the rear hinge 205, and the inner side surface of the chassis shell 201 is fixedly connected to the limit strip 207, and the one side surface of the limit strip 207 is snap-connected to the support plate 208, and the one side surface of the support plate 208 is slidably connected to the fixed angle groove 209, and the lower surface of the fixed angle groove 209 is slidably connected to the fixed cap 210. With the setting of the fixed cap 210, when in use, the chassis shell 201 of the modular layered mechanism 2 can provide physical protection for the internal instruments, and the heat dissipation holes continuously dissipate heat to maintain the normal operating temperature. The front door 203 and the rear door 206 can be opened through the hidden handle 204. The front door 203 is connected to the chassis shell 201 through the front hinge 202, and the rear door 206 is connected to the chassis shell 201 through the rear hinge 205, which is convenient for operators to check and maintain the internal modules. The internal limit strip 207, support plate 208, fixed angle groove 209 and fixed cap 210 ensure that each instrument is in the correct position. The device can maintain a stable position and connection state during normal operation and when subjected to external impact to ensure reliable operation of the device. The device adopts a modular layered design. Compared with traditional non-modular relay protection devices, each instrument is fixed on a support plate 208 at different levels through a fixed angle slot 209 and a fixed cap 210. When a component fails, maintenance personnel can quickly locate the module layer where the faulty component is located by opening the front door 203 or the rear door 206, and only need to inspect or replace the module without inspecting the entire device, which greatly reduces maintenance costs and reduces power outage time.

[0031] Furthermore, a group of front hinges 202 and a group of rear hinges 205 are symmetrically arranged on one side surface of the chassis shell 201, and explosion-proof glass is installed on one side surface of the front door 203. Through the arrangement of the front hinge 202, the rear hinge 205 and the front door 203, when in use, the front hinge 202 and the rear hinge 205 are symmetrically arranged in a group, so that the connection between the front door 203 and the rear door 206 is more stable, and the symmetrical layout can evenly share the weight of the door to ensure the stability of the door during frequent opening and closing. Through the explosion-proof glass, the staff can observe the working status of the internal instruments without opening the chassis, such as whether the indicator light is normally on, etc., which is convenient for daily inspection work.

[0032] Furthermore, the hidden handle 204 pops out after pressing the anti-slip pattern, making it convenient to open the front door 203. Four groups of limit strips 207 are symmetrically arranged with the median vertical line of the chassis shell 201. Through the arrangement of the hidden handle 204 and the limit strips 207, when in use, the design of the hidden handle 204 can prevent the front door 203 from being accidentally opened due to accidental collision of the handle by a person during the normal operation of the device. The handle can only be opened by pressing the anti-slip pattern and then popping it out. This adds a layer of safety protection mechanism to ensure that the door is opened intentionally. Four groups of limit strips 207 are symmetrically arranged with the median vertical line of the chassis shell 201. This symmetrical distribution can provide uniform support and positioning for the support plate 208 inside the chassis.

[0033] Furthermore, there are three groups of support plates 208 that are connected by upper and lower snap-fitting on the inner sides of the four groups of limit strips 207, and the snap-fitting strips on the edges of the support plates 208 are relatively raised, which can prevent the chassis shell 201 from tilting and causing the support plates 208 to slide out. Through the setting of the support plates 208, when in use, there are three groups of support plates 208 that are connected by upper and lower snap-fitting on the inner sides of the four groups of limit strips 207. This layered design provides an orderly placement space for instruments inside the device, and instruments with different functions can be placed on different support plates 208 respectively, realizing modular layered management. In this way, the layout between instruments is clearer, wiring and signal transmission are convenient, and the possibility of line crossing and interference is reduced. The raised snap-fitting strips can effectively fix the support plates 208, ensuring that the internal instruments still maintain a stable position in unexpected situations such as chassis tilting, thereby ensuring the reliability and safety of the device and reducing the risk of device failure due to external interference.

[0034] Furthermore, heat dissipation holes are provided on both sides of the chassis shell 201 and one side surface of the front door 203 for dissipating heat when the instrument is working. A plurality of groups of holes are provided on the surface of the support plate 208, which can cooperate with the fixed angle grooves 209 and the fixed caps 210 to modularize and layer the instrument and fix it to a certain extent. Through the arrangement of the chassis shell 201, the front door 203 and the support plate 208, when in use, the heat dissipation holes can effectively dissipate the heat generated inside, so that the internal temperature of the device is maintained within a suitable range, thereby ensuring the normal operation of the instrument and improving the reliability and stability of the device.

[0035] Furthermore, silicone rubber is provided on the inner side of the fixed angle groove 209, which can fit tightly to the surface of the instrument. The outer surface of the fixed cap 210 is provided with multiple groups of anti-slip grooves. Through the setting of the fixed angle groove 209 and the fixed cap 210, when in use, the silicone rubber on the inner side of the fixed angle groove 209 can fit tightly to the surface of the instrument. During the operation of the relay protection device, it will inevitably be subjected to vibrations, such as operating vibrations from surrounding electrical equipment or vibrations caused by external environmental factors. The conformability of the silicone rubber can effectively buffer the impact of these vibrations on the instrument and prevent the instrument from loosening or being damaged due to vibrations.

[0036] Furthermore, the current detection device 4 and the voltage detection device 5 are arranged above the uppermost support plate 208, and are fixed in position by fixing angle grooves 209 and fixing caps 210. Model indicator lights are arranged on one side surface of the current detection device 4 and the voltage detection device 5. When a cable current or voltage fault is detected, the indicator lights up, and at the same time, the trip device 7 is controlled to perform adjustment processing to protect the power grid. Through the arrangement of the current detection device 4 and the voltage detection device 5, when in use, the model indicator lights arranged on the surface of one side can light up in time when a cable current or voltage fault is detected, providing an intuitive fault prompt for the operator. This allows the staff to quickly determine whether there is a current or voltage fault by observing the indicator light status during the inspection or monitoring process without complicated detection equipment and operations, thereby facilitating the preliminary diagnosis of the fault. When a fault is detected, the current detection device 4 and the voltage detection device 5 can control the trip device 7 to perform adjustment processing, thereby realizing a fast fault response mechanism. This automatic control method can cut off the fault line in the shortest time, prevent the fault from further expanding, and effectively protect the safe operation of the power grid.

[0037] Furthermore, the phase detector 6 and the tripping device 7 are arranged above the support plate 208 of the middle layer, and are fixed in position by the fixed angle slot 209 and the fixed cap 210. The phase detector 6 monitors the phase relationship between the current and the voltage in real time. If a fault occurs, the phase difference changes, and the phase detector 6 issues a warning alarm. Through the setting of the phase detector 6 and the tripping device 7, when in use, these potential fault hazards can be discovered in time by real-time monitoring of the phase relationship, which provides an important guarantee for the safe operation of the power grid. If a fault occurs, the phase difference changes, and the phase detector 6 issues a warning alarm. This rapid alarm mechanism can promptly notify the operator or trigger other protection actions at the early stage of the fault. Compared with manual inspections or other detection methods with higher delays, it can respond to faults more quickly and gain time for subsequent fault handling.

[0038] Furthermore, the frequency power detector 9 and the equipment power supply 10 are arranged above the bottom support plate 208, and are fixed in position by fixing angle slots 209 and fixing caps 210. The frequency power detector 9 monitors the operating frequency of the power grid and the power transmission direction in real time. When an abnormal situation occurs, the frequency power detector 9 and the equipment power supply 10 will control the tripping device 7 to make adjustments to protect the power grid. Through the setting of the frequency power detector 9 and the equipment power supply 10, when in use, the frequency power detector 9 can promptly detect abnormal situations such as motor failure and sudden load changes. When an abnormal situation occurs, the frequency power detector 9 and the equipment power supply 10 will control the tripping device 7 to make adjustments. This joint control mechanism enhances the device's ability to respond to power grid failures. The participation of the equipment power supply 10 in control can ensure that during the fault handling process, even if there is a problem with the power supply of the power grid, it can still provide sufficient power support for key equipment such as the tripping device 7 to ensure the smooth completion of the tripping action.

[0039] Furthermore, a tripping knife 8 is provided on one side surface of the tripping device 7, and the user can manually control the tripping knife 8 to short-circuit the circuit. The power supply of the equipment power supply 10 comes from the power grid. Under normal circumstances, all equipment uses electricity from the power grid. When the power grid fails and the power is cut off, the equipment power supply 10 starts to provide power for various instruments. Through the setting of the tripping device 7, when in use, a direct and effective emergency measure is provided in an emergency situation. The operator can manually operate the tripping knife 8 to short-circuit the circuit, quickly cut off the faulty circuit, prevent the fault range from expanding, and avoid causing more serious damage to the power grid equipment.

[0040] With the above structure, the working principle of this case is: when a fault occurs in the distribution network, such as an abnormal increase or decrease in current, or a voltage fluctuation beyond the normal range, the current detection device 4 and the voltage detection device 5 first keenly detect these abnormal parameter changes. At this time, the model indicator light set on one side of the surface immediately lights up, intuitively reminding the operator of the possible fault, and quickly sends the fault signal to the trip device 7. If the fault causes the phase difference between the current and voltage to change, the phase detector 6 in the middle layer will monitor this change in real time and immediately issue a warning alarm, and at the same time transmit the fault information to the trip device 7. If the operating frequency of the power grid fluctuates abnormally or the power transmission direction does not conform to the normal operation In the case of the power distribution mode, the frequency and power detector 9 at the bottom will detect these problems in time and transmit the fault signal to the tripping device 7. If it is determined that the power grid needs to be protected to prevent the fault from expanding, the tripping device 7 is started, driving the tripping knife 8 connected to the rotating surface on one side to operate, so that the circuit forms a short-circuit state, thereby quickly cutting off the faulty part, effectively isolating the fault, and protecting the normal operation of other parts of the distribution network. In this process, the equipment power supply 10 continues to provide power to the key instruments in the device to ensure the smooth completion of the protection action. In addition, a tripping knife 8 is provided on one side of the tripping device 7. In some special emergency situations, such as the failure of the automatic protection system to respond in time to a serious In case of a serious fault, the user can manually control the tripping knife 8 to short-circuit the circuit, quickly cut off the faulty circuit, prevent the fault range from further expanding, and avoid causing more serious damage to the power grid equipment. Through the setting of the modular layered mechanism 2, the chassis shell 201 of the modular layered mechanism 2 can provide physical protection for the internal instruments, and the heat dissipation holes can continuously dissipate heat to maintain the normal working temperature. The front door 203 and the rear door 206 can be opened by the hidden handle 204. The front door 203 is connected to the chassis shell 201 by the front hinge 202, and the rear door 206 is connected to the chassis shell 201 by the rear hinge 205, which is convenient for the operator to check and maintain the internal modules. The positioning strip 207, the support plate 208, the fixed angle slot 209 and the fixed cap 210 ensure that each instrument maintains a stable position and connection state during normal operation and when subjected to external impact, thereby ensuring reliable operation of the device. The device adopts a modular layered design. Compared with the traditional non-modular relay protection device, each instrument is fixed on the support plate 208 at different levels through the fixed angle slot 209 and the fixed cap 210. When a component fails, the maintenance personnel can quickly locate the module layer where the faulty component is located by opening the front door 203 or the rear door 206, and only need to inspect or replace the module without inspecting the entire device, which greatly reduces the maintenance cost and reduces the power outage time.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel relay protection device for a power distribution network, comprising an incoming line (1), characterized in that: A modular layered mechanism (2) is provided on one side surface of the incoming line (1), an outgoing line (3) is provided on one side surface of the modular layered mechanism (2), a current detection device (4) is provided on the inner side surface of the modular layered mechanism (2), a voltage detection device (5) is provided on the inner side surface of the modular layered mechanism (2), a phase detector (6) is provided on the inner side surface of the modular layered mechanism (2), a tripping device (7) is provided on the inner side surface of the modular layered mechanism (2), a tripping knife (8) is rotatably connected to one side surface of the tripping device (7), a frequency power detector (9) is provided on the inner side surface of the modular layered mechanism (2), and a device supply power (10) is provided on the inner side surface of the modular layered mechanism (2); The modular layered structure (2) comprises a chassis shell (201), a front hinge (202), a front door (203), a hidden handle (204), a rear hinge (205), a rear door (206), a limit strip (207), a support plate (208), a fixed angle groove (209) and a fixed cap (210); one side surface of the incoming line (1) is fixedly connected to the chassis shell (201); one side surface of the chassis shell (201) is fixedly connected to the front hinge (202); one side surface of the front hinge (202) is fixedly connected to the front door (203); and the front door (210) is fixedly connected to the front door (203). 03) is fixedly connected to a hidden handle (204) on one side surface, the case shell (201) is fixedly connected to a rear hinge (205) on one side surface, the rear hinge (205) is fixedly connected to a rear door (206) on one side surface, the inner side surface of the case shell (201) is fixedly connected to a limit strip (207), one side surface of the limit strip (207) is snap-connected to a support plate (208), one side surface of the support plate (208) is slidably connected to a fixed angle groove (209), and a fixed cap (210) is slidably connected to the lower surface of the fixed angle groove (209).

2. A novel relay protection device for distribution network according to claim 1, characterized in that: The front hinge (202) and the rear hinge (205) are symmetrically arranged in a group on a side surface of the chassis shell (201), and explosion-proof glass is installed on a side surface of the front door (203).

3. A novel relay protection device for distribution network according to claim 1, characterized in that: The hidden handle (204) pops out after the anti-slip pattern is pressed, making it convenient to open the front door (203). Four groups of limit strips (207) are symmetrically arranged around the mid-vertical line of the chassis shell (201).

4. A novel relay protection device for distribution network according to claim 1, characterized in that: The support plate (208) is connected with three groups of upper and lower clamping strips inside the four groups of limit strips (207). The clamping strips at the edges of the support plate (208) are relatively raised, which can prevent the support plate (208) from sliding out due to the tilt of the chassis shell (201).

5. A novel relay protection device for distribution network according to claim 1, characterized in that: Both sides of the chassis shell (201) and one side of the front door (203) are provided with heat dissipation holes for dissipating heat when the instrument is working. The surface of the support plate (208) is provided with multiple groups of holes, which can cooperate with the fixing angle grooves (209) and the fixing caps (210) to modularize and layer the instrument and fix it to a certain extent.

6. A novel relay protection device for distribution network according to claim 1, characterized in that: The inner side of the fixing angle groove (209) is provided with silicon rubber so as to be closely fitted to the surface of the instrument, and the outer side surface of the fixing cap (210) is provided with a plurality of groups of anti-slip grooves.

7. A novel relay protection device for distribution network according to claim 1, characterized in that: The current detection device (4) and the voltage detection device (5) are arranged above the uppermost support plate (208) and are fixed in position by means of a fixing angle slot (209) and a fixing cap (210). A signal indicator light is arranged on one side surface of the current detection device (4) and the voltage detection device (5). When a cable current or voltage fault is detected, the indicator light is turned on and the tripping device (7) is controlled to perform adjustment processing to protect the power grid.

8. A novel relay protection device for distribution network according to claim 1, characterized in that: The phase detector (6) and the tripping device (7) are arranged above the support plate (208) of the middle layer and are fixed in position by means of a fixing angle slot (209) and a fixing cap (210). The phase detector (6) monitors the phase relationship between current and voltage in real time. If a fault occurs, the phase difference changes, causing the phase detector (6) to issue a warning alarm.

9. A novel relay protection device for distribution network according to claim 1, characterized in that: The frequency power detector (9) and the equipment power supply (10) are arranged above the bottom support plate (208) and are fixed in position by means of a fixing angle slot (209) and a fixing cap (210). The frequency power detector (9) monitors the operating frequency and power transmission direction of the power grid in real time. When an abnormal situation occurs, the frequency power detector (9) and the equipment power supply (10) control the tripping device (7) to adjust and process so as to protect the power grid.

10. A novel relay protection device for distribution network according to claim 1, characterized in that: A tripping knife (8) is provided on one side surface of the tripping device (7), and a user can manually control the tripping knife (8) to short-circuit the circuit. The power supply of the equipment power supply (10) comes from the power grid. Under normal circumstances, all equipment uses electricity from the power grid. When the power grid fails and the power is cut off, the equipment power supply (10) starts to provide power for various instruments.

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