Urban rail transit relay protection practical training device

Abstract

The utility model provides a kind of urban rail transit relay protection practical training device, the device includes: fault simulation module, setting and output analog fault signal, the analog fault signal includes abnormal current, abnormal voltage;Relay protection module is connected the fault simulation module, receives the analog fault signal, and whether output action signal is judged according to the protection logic set;Control management module is connected the fault simulation module, relay protection module and external device respectively, receives the logic judgment result of the relay protection module and the state signal of the external device, the action of the external device is controlled when the relay protection module meets action condition, and the external device includes analog circuit breaker.The utility model equipment concentrates design, can flexibly set multiple fault scenes, easy to operate, improve training efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power supply and distribution technology for rail transit, and in particular to a training device for relay protection of urban rail transit. Background Technology

[0002] In urban rail transit power supply and distribution systems, training and testing of relay protection devices currently rely primarily on actual equipment. This traditional approach has significant drawbacks: First, the dispersed distribution of equipment and complex operating procedures make centralized management difficult, directly impacting the efficiency of training. Second, existing equipment lacks flexibility in setting fault scenarios, making it difficult to adapt to diverse and personalized training needs, thus limiting the comprehensiveness and relevance of training content. Third, actual equipment operation carries high risks; improper operation can easily damage equipment, adversely affecting the normal operation of the power supply and distribution system.

[0003] In summary, the relay protection training equipment for rail transit power supply and distribution systems generally suffers from problems such as scattered equipment layout, limited fault simulation functions, and poor ease of operation, and can no longer meet the needs of efficient, safe, and diversified modern training. Utility Model Content

[0004] To address the aforementioned issues, this utility model proposes a training device for relay protection in urban rail transit. The device features a centralized design, allows for flexible setup of various fault scenarios, is easy to operate, and improves training efficiency.

[0005] This utility model proposes a training device for relay protection in urban rail transit, comprising:

[0006] The fault simulation module sets and outputs simulated fault signals, including abnormal current and abnormal voltage.

[0007] The relay protection module is connected to the fault simulation module, receives the simulated fault signal, and determines whether to output an action signal according to the set protection logic.

[0008] The control and management module is connected to the fault simulation module, the relay protection module, and the external device, respectively. It receives the logic judgment result of the relay protection module and the status signal of the external device. When the relay protection module meets the action conditions, it controls the action of the external device, which includes a simulated circuit breaker.

[0009] In one embodiment, the relay protection module includes a first overcurrent protection relay, a second overcurrent protection relay, a third overcurrent protection relay, a first differential relay, and a second differential relay;

[0010] The first, second, and third overcurrent protection relays monitor whether the current is abnormal, trigger an action when the current exceeds the set value, and provide overvoltage, undervoltage, and phase loss protection.

[0011] The first differential relay and the second differential relay detect whether there is a current fault by comparing the current difference at both ends, provide voltage differential protection, and locate the fault location.

[0012] In one embodiment, the first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay each include a fault analog input terminal, an action signal output terminal, and an operating status terminal;

[0013] The fault analog input terminal receives the simulated fault signal from the fault simulation module;

[0014] The action signal output terminal outputs an action signal;

[0015] The operating status terminal outputs the current operating status signal of the relay.

[0016] In one embodiment, the fault analog input terminals of the first overcurrent protection relay and the second overcurrent protection relay both include a three-phase current input terminal for detecting the three-phase current, a zero-sequence current input terminal for detecting the zero-sequence current, and a voltage input terminal for detecting the voltage.

[0017] The fault analog input terminals of the first differential relay and the second differential relay both include a current input terminal for detecting current signals at different positions and a voltage input terminal for detecting voltage conditions;

[0018] The fault analog input terminal of the third overcurrent protection relay includes four current input terminals for detecting current signals at different locations and a voltage input terminal for detecting voltage conditions.

[0019] In one embodiment, the first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay each further include a grounding terminal, and the grounding terminals of the first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay are respectively grounded.

[0020] In one embodiment, the control management module includes a digital input terminal, a digital output terminal, an analog input terminal, and an analog output terminal;

[0021] The digital input terminal receives the logic judgment result of the relay protection module and the status signal of the external device;

[0022] The digital output terminal sends a status indication signal to control the action of the external device when the action conditions are met.

[0023] The analog input terminal receives the simulated fault signal from the fault simulation module;

[0024] The analog output terminal outputs real-time simulated fault information.

[0025] In one embodiment, the urban rail transit relay protection training device further includes a human-machine interface, the human-machine interface includes a communication interface, and the control management module further includes a communication terminal;

[0026] The human-machine interface is connected to the control and management module, providing a visual operation and display interface for setting protection parameters, viewing the status of external devices, and fault information.

[0027] In one embodiment, the urban rail transit relay protection training device further includes a power switch module. The first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay each include a power supply terminal. The power switch module is connected to the power supply terminals of the first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay respectively, and controls the power supply on and off of the first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay respectively.

[0028] In one embodiment, the control management module includes a power supply terminal, and the power switch module is connected to the power supply terminal of the control management module, simultaneously controlling the power supply on / off of the control management module and the human-machine interface.

[0029] In one embodiment, the relay protection module and the control management module are installed inside the cabinet.

[0030] Compared with existing technologies, the beneficial effects of this utility model's urban rail transit relay protection training device are as follows:

[0031] 1) The urban rail transit relay protection training device of this utility model adopts an integrated design, which integrates the scattered relay protectors into a unified cabinet and is equipped with a convenient operation interface to realize centralized management of equipment. This can significantly shorten the training preparation time, reduce the operation complexity, support efficient training, greatly improve training efficiency, and facilitate daily maintenance and management.

[0032] 2) The urban rail transit relay protection training device of this utility model can flexibly simulate a variety of fault scenarios. Trainees can repeatedly practice fault diagnosis, protection device verification and setting in a safe environment, become familiar with various fault handling methods, and strengthen their ability to cope with actual working conditions.

[0033] 3) The urban rail transit relay protection training device of this utility model can avoid the risks of operating on actual equipment, ensure the safety of the training process, and there is no need to worry about affecting the operation of the actual power supply and distribution system. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of an urban rail transit relay protection training device according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the circuit terminals of a first overcurrent protection relay according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the circuit terminals of a second overcurrent protection relay according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the circuit terminals of a first differential relay according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the circuit terminals of a second differential relay according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the circuit terminals of a third overcurrent protection relay according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the circuit terminals of a human-machine interface according to an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the circuit terminals of the control and management module according to an embodiment of the present invention;

[0042] Figure 9 This is a front view of the urban rail transit relay protection training device assembled inside the cabinet according to an embodiment of the present invention.

[0043] Figure 10 This is a rear view of the assembly of an urban rail transit relay protection training device in a cabinet, according to an embodiment of the present invention.

[0044] Figure Labels

[0045] 100. Fault simulation module; 200. Relay protection module; 300. Control management module; 400. Human-machine interface; 500. Power switch module; 201. Fault analog input terminal; 202. Action signal output terminal; 203. Operating status terminal; 204. Grounding terminal; 205. Power supply terminal; 210. First overcurrent protection relay; 220. Second overcurrent protection relay; 230. Third overcurrent protection relay; 240. First differential relay; 250. Second differential relay; 301. Digital input terminal; 302. Digital output terminal; 303. Analog input terminal; 304. Analog output terminal; 305. Communication terminal; 401. Communication interface. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0047] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0048] Furthermore, the term "an embodiment" or "embodiment" in this application refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.

[0049] This utility model proposes a relay protection training device for urban rail transit, including a fault simulation module 100, a relay protection module 200, and a control and management module 300. (See attached diagram.) Figure 1The fault simulation module 100 is used to set and output simulated fault signals, including abnormal currents (such as three-phase short-circuit currents), abnormal voltages (such as single-phase grounding voltages, open-circuit voltages, etc.), and phase offsets. The fault simulation module 100 can further set parameters such as fault time, fault location, and fault severity (by adjusting current and voltage amplitudes) to simulate various possible fault scenarios in the urban rail transit power system and send the corresponding fault signals to the relay protection module 200. The relay protection module 200 has functions such as overcurrent protection, overload protection, and fault detection. It is connected to the fault simulation module 100, receives simulated fault signals, and determines whether to output an action signal based on the set protection logic. The control management module 300 is connected to the fault simulation module 100, the relay protection module 200, and external devices. It receives the logic judgment results (whether an action signal is output) from the relay protection module 200 and the status signals of the external devices (such as the opening and closing status of circuit breakers, etc.). When the relay protection module 200 meets the action conditions, it controls the action of the external devices. External devices include simulated circuit breakers, etc.

[0050] One embodiment of the relay protection module 200 of this utility model includes a first overcurrent integrated protection relay 210 (see...) Figure 2 ), Second overcurrent protection relay 220 (see Figure 3 ), third overcurrent protection relay 230 (see Figure 6 ), First differential relay 240 (see Figure 4 ) and second differential relay 250 (see Figure 5 The first overcurrent integrated protection relay 210, the second overcurrent integrated protection relay 220, and the third overcurrent integrated protection relay 230 are used to monitor whether the current (including phase current and zero-sequence current) is abnormal. They trigger an action (such as tripping) when the current exceeds a set value (time-definite or inverse-time-definite). In actual power supply lines, they provide line overcurrent and busbar protection, detect overload or short-circuit faults in power supply lines (such as contact networks and cables), and provide overvoltage, undervoltage, and phase loss protection. The first differential relay 240 and the second differential relay 250 detect current faults by comparing the current difference between their two ends, providing voltage differential protection, locating fault positions, and providing 35kV fiber optic differential protection in actual power supply lines.

[0051] In one embodiment of this utility model, the first overcurrent integrated protection relay 210, the second overcurrent integrated protection relay 220, the third overcurrent integrated protection relay 230, the first differential relay 240, and the second differential relay 250 each include a fault analog input terminal 201, an action signal output terminal 202, and a running status terminal 203. The fault analog input terminal 201 is used to receive simulated fault signals from the fault simulation module 100. The action signal output terminal 202 is used to output action signals. The running status terminal 203 is used to output the current running status signal of the relay, such as normal operation or fault operation, facilitating monitoring of the relay's operation by the user. By inputting simulated fault signals through these terminals, trigger conditions for various protection functions of the relay protection module 200 are provided. Commands, signals, and controls from the relay protection device are transmitted and received to control the operation of external equipment, providing a logical basis for the operation and protection of the power supply equipment.

[0052] In one embodiment of this utility model, the fault analog input terminals 201 of the first overcurrent integrated protection relay 210 and the second overcurrent integrated protection relay 220 both include a three-phase current input terminal for detecting three-phase current, a zero-sequence current input terminal for detecting zero-sequence current, and a voltage input terminal for detecting voltage. The fault analog input terminals 201 of the first differential relay 240 and the second differential relay 250 both include a current input terminal for detecting current signals at different locations and a voltage input terminal for detecting voltage. The fault analog input terminal 201 of the third overcurrent integrated protection relay 230 includes four current input terminals for detecting current signals at different locations and a voltage input terminal for detecting voltage.

[0053] The first overcurrent integrated protection relay 210, the second overcurrent integrated protection relay 220, the third overcurrent integrated protection relay 230, the first differential relay 240, and the second differential relay 250 each include a grounding terminal 204. The grounding terminals 204 of the first overcurrent integrated protection relay 210, the second overcurrent integrated protection relay 220, the third overcurrent integrated protection relay 230, the first differential relay 240, and the second differential relay 250 are respectively grounded to prevent the relay from causing harm to personnel and equipment when it leaks current, and to play the role of electrical safety grounding.

[0054] One embodiment of the present invention includes a control management module 300 (see [link]). Figure 8The control management module 300 includes a digital input terminal 301, a digital output terminal 302, an analog input terminal 303, and an analog output terminal 304. The digital input terminal 301 receives the logic judgment results (such as action signals) from the relay protection module 200, the operating status signals of each relay, and the status signals of external devices (such as the opening and closing status of a simulated circuit breaker). The digital output terminal 302 sends status indication signals to control the action of external devices when the action conditions are met. For example, when a fault is detected and the protection action conditions are met, the digital output terminal 302 can send a trip signal to the trip coil of the circuit breaker, causing the circuit breaker to trip and clear the fault. The analog input terminal 303 receives the simulated fault signals and environmental analog signals (such as temperature and pressure) from the fault simulation module 100. The analog output terminal 304 outputs real-time simulated fault information (such as the current waveform during a fault) for training personnel to analyze the protection action process. It should be noted that the physical terminals of the control management module 300 are arranged in layers. Figure 8 This is only for illustrative purposes; all terminals are arranged in a row.

[0055] One embodiment of the urban rail transit relay protection training device of this utility model also includes a human-machine interface 400 (see...). Figure 7 The human-machine interface 400 includes a communication interface 401, and the control management module 300 also includes a communication terminal 305. The human-machine interface 400 is connected to the control management module 300, providing a visual operation and display interface, which facilitates operators in setting protection parameters (such as overcurrent settings, differential action thresholds, etc.), viewing the status of external equipment and fault information, and facilitating observation and analysis by trainees.

[0056] Each relay in the relay protection module 200 also includes a display interface for viewing, operating, modifying, and connecting the relays.

[0057] In one embodiment of this utility model, the communication interface 401 is a serial port. The communication terminal 305 of the control management module 300 includes a serial port and a network port, used for configuring protection parameters and data interaction. The human-machine interface 400 and the control management module 300 transmit data such as protection settings, operating parameters, and fault information through the serial port. The control management module 300 can communicate with remote devices through the network port, facilitating remote monitoring, data transmission, and centralized management. In addition, both the human-machine interface 400 and the control management module 300 include grounding terminals to ensure equipment safety.

[0058] One embodiment of the urban rail transit relay protection training device of this utility model further includes a power switch module 500. The first overcurrent integrated protection relay 210, the second overcurrent integrated protection relay 220, the third overcurrent integrated protection relay 230, the first differential relay 240, and the second differential relay 250 each include a power supply terminal 205. The power switch module 500 is connected to the power supply terminals 205 of the first overcurrent integrated protection relay 210, the second overcurrent integrated protection relay 220, the third overcurrent integrated protection relay 230, the first differential relay 240, and the second differential relay 250, respectively, and controls the power supply on / off of the first overcurrent integrated protection relay 210, the second overcurrent integrated protection relay 220, the third overcurrent integrated protection relay 230, the first differential relay 240, and the second differential relay 250. The control management module 300 includes a power supply terminal, and the power switch module 500 is connected to the power supply terminal of the control management module 300, simultaneously controlling the power supply on / off of the control management module 300 and the human-machine interface 400.

[0059] Specifically, the power switch module 500 includes six power switches, namely 1ZK to 6ZK (see...). Figure 10 ), 1ZK to 6ZK are all DC switches. 1ZK to 5ZK correspond to the first overcurrent protection relay 210, the second overcurrent protection relay 220, the first differential relay 240, the second differential relay 250, and the third overcurrent protection relay 230, respectively, controlling the power-off and power-on operations of the relays. The protection devices can be opened and closed independently for easy maintenance. The control management module 300 and the human-machine interface 400 share a power supply and are simultaneously controlled by switch 6ZK.

[0060] The control management module 300 can also be equipped with an auxiliary power output terminal, which can provide auxiliary power to some external low-power devices, such as connected sensors, indicator lights, etc., so that these devices can work normally and cooperate with the control management module 300.

[0061] In addition, the urban rail transit relay protection training device can also be equipped with lighting, etc. At the same time, the power switch module 500 also needs to be equipped with a corresponding power switch, and the lighting power switch is generally an AC switch.

[0062] In one embodiment of this utility model, the relay protection module 200 and the control management module 300 are installed inside a cabinet, participating in... Figure 9 , Figure 10 This integrated design facilitates operation and management.

[0063] In one embodiment of this utility model, the relay protection module 200 uses a Siemens 7SJ60 series relay protector. The first overcurrent protection relay 210 is a Siemens 7SJ622, the second overcurrent protection relay 220 is a Siemens 7SJ632, the third overcurrent protection relay 230 is a Siemens 7SJ683, the first differential relay 240 is a Siemens 7SD610, the second differential relay 250 is a Siemens 7SD610, the human-machine interface 400 is a Siemens Sitras PRO HMI, and the control management module 300 is a Siemens Sitras PRO CU. Figure 9 and Figure 10 The power switch module 500, various relays, and control management module 300 are installed at the locations shown to meet the normal operation and fault setting requirements of the urban rail transit relay protection training device.

[0064] When using the urban rail transit relay protection training device of this utility model for training, the fault simulation module 100 can output various simulated fault signals (such as different types of short circuit and open circuit faults). By connecting to the relay protection module 200 (e.g., connecting to the fault simulation input terminal of an overcurrent integrated protection relay or differential relay), the simulated fault signal is injected into the protection device. After receiving the fault signal, the relay and other protection devices make judgments according to their own set protection logic. If the action conditions are met, the action signal output terminal will output an action signal, such as driving a simulated circuit breaker to trip. Simultaneously, the control and management module 300 can monitor the operation of each protection device in real time and record relevant data.

[0065] The urban rail transit relay protection training device of this utility model can meet the training needs of relay protection parameter setting and verification, current-type and voltage-type relay characteristic experiments, intermediate relay, time relay and signal relay characteristic experiments, three-stage current protection experiments, directional current protection experiments, differential protection experiments, reclosing experiments and other functions.

[0066] When setting and verifying relay protection parameters, protection parameters (such as overcurrent settings and differential action thresholds) are written to relay protection modules such as overcurrent integrated protection relays and differential relays through the human-machine interface. After writing, simulated fault signals can be injected through the fault simulation module to observe the operation of the relay protection modules and compare them with the theoretical operating values ​​to verify the accuracy of the parameter settings.

[0067] When conducting characteristic tests on current-type and voltage-type relays, the fault simulation module outputs variable current and voltage signals to the current and voltage input terminals of the overcurrent protection relay. By changing the signal magnitude, the relay's operation is observed (through the human-machine interface), and its operating characteristics (such as operating value, return value, and operating time) are analyzed.

[0068] During the three-stage current protection experiment, three-stage current protection settings (generally instantaneous trip, time-limited instantaneous trip, and overcurrent protection settings) are set on the first, second, and third overcurrent integrated protection relays. The fault simulation module simulates different fault types and fault current magnitudes, causing the fault current to sequentially reach the operating values ​​of the three-stage protection. The relays are observed to operate sequentially according to the set operating logic (different delays), allowing for an understanding of the tiered protection coordination principle and achieving practical training in three-stage current protection function testing.

[0069] During the directional current protection experiment, relevant parameters for directional current protection (such as the power direction element setting) are set in the overcurrent protection relay. The fault simulation module outputs current and voltage signals with different phases to simulate forward and reverse faults. The relay determines the fault direction based on the power direction element and only operates when there is a forward fault and the current exceeds the set value, thus verifying the directional current protection function.

[0070] During differential protection testing, for the differential relay, the fault simulation module inputs current signals from both sides (simulating currents during normal operation and internal / external faults). During normal operation or external faults, the current difference between the two sides is small, and the relay does not operate; during internal faults, the current difference exceeds the operating value, the relay output operates, driving the simulated circuit breaker to trip, thus completing the differential protection test.

[0071] During the reclosing test, reclosing parameters (such as reclosing delay and number of reclosing attempts) are set in the control management module via the human-machine interface. The fault simulation module simulates a transient fault (such as a transient short circuit) to cause the protection device to trip. After the set reclosing delay, the control management module controls the relay to reclose, verifying whether the reclosing function is normal.

[0072] It should be noted that, in this application, unless otherwise explicitly specified and limited, terms such as "connection," "setup," and "assembly" should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can also refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0073] The constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described herein. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of this utility model. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0074] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0075] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0076] This utility model has the following beneficial effects:

[0077] 1) The urban rail transit relay protection training device of this utility model adopts an integrated design, which integrates the scattered relay protectors into a unified cabinet and is equipped with a convenient operation interface to realize centralized management of equipment. This can significantly shorten the training preparation time, reduce the operation complexity, support efficient training, greatly improve training efficiency, and facilitate daily maintenance and management.

[0078] 2) The urban rail transit relay protection training device of this utility model can flexibly simulate a variety of fault scenarios. Trainees can repeatedly practice fault diagnosis, protection device verification and setting in a safe environment, become familiar with various fault handling methods, and strengthen their ability to cope with actual working conditions.

[0079] 3) The urban rail transit relay protection training device of this utility model can avoid the risks of operating on actual equipment, ensure the safety of the training process, and there is no need to worry about affecting the operation of the actual power supply and distribution system.

[0080] The embodiments described above are merely further illustrations of the present invention and are not intended to limit the present invention in any other way. The present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and changes based on the present invention, but all such modifications and changes should fall within the protection scope of the present invention.

Claims

1. A training device for relay protection in urban rail transit, characterized in that, include: The fault simulation module sets and outputs simulated fault signals, including abnormal current and abnormal voltage. The relay protection module is connected to the fault simulation module, receives the simulated fault signal, and determines whether to output an action signal according to the set protection logic. The control and management module is connected to the fault simulation module, the relay protection module, and the external device, respectively. It receives the logic judgment result of the relay protection module and the status signal of the external device. When the relay protection module meets the action conditions, it controls the action of the external device, which includes a simulated circuit breaker.

2. The urban rail transit relay protection training device according to claim 1, characterized in that, The relay protection module includes a first overcurrent integrated protection relay, a second overcurrent integrated protection relay, a third overcurrent integrated protection relay, a first differential relay, and a second differential relay; The first, second, and third overcurrent protection relays monitor whether the current is abnormal, trigger an action when the current exceeds the set value, and provide overvoltage, undervoltage, and phase loss protection. The first differential relay and the second differential relay detect whether there is a current fault by comparing the current difference at both ends, provide voltage differential protection, and locate the fault location.

3. The urban rail transit relay protection training device according to claim 2, characterized in that, The first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay each include a fault analog input terminal, an action signal output terminal, and an operating status terminal; The fault analog input terminal receives the simulated fault signal from the fault simulation module; The action signal output terminal outputs an action signal; The operating status terminal outputs the current operating status signal of the relay.

4. The urban rail transit relay protection training device according to claim 3, characterized in that, The fault analog input terminals of the first and second overcurrent protection relays both include a three-phase current input terminal for detecting the three-phase current, a zero-sequence current input terminal for detecting the zero-sequence current, and a voltage input terminal for detecting the voltage. The fault analog input terminals of the first differential relay and the second differential relay both include a current input terminal for detecting current signals at different positions and a voltage input terminal for detecting voltage conditions; The fault analog input terminal of the third overcurrent protection relay includes four current input terminals for detecting current signals at different locations and a voltage input terminal for detecting voltage conditions.

5. The urban rail transit relay protection training device according to claim 3, characterized in that, The first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay each include a grounding terminal, and the grounding terminals of the first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay are respectively grounded.

6. The urban rail transit relay protection training device according to claim 3, characterized in that, The control and management module includes digital input terminals, digital output terminals, analog input terminals, and analog output terminals; The digital input terminal receives the logic judgment result of the relay protection module and the status signal of the external device; The digital output terminal sends a status indication signal to control the action of the external device when the action conditions are met. The analog input terminal receives the simulated fault signal from the fault simulation module; The analog output terminal outputs real-time simulated fault information.

7. The urban rail transit relay protection training device according to claim 6, characterized in that, It also includes a human-machine interface, which includes a communication interface, and the control and management module also includes a communication terminal; The human-machine interface is connected to the control and management module, providing a visual operation and display interface for setting protection parameters, viewing the status of external devices, and fault information.

8. The urban rail transit relay protection training device according to claim 7, characterized in that, It also includes a power switch module. The first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay each include a power supply terminal. The power switch module is connected to the power supply terminals of the first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay respectively, and controls the power supply on and off of the first overcurrent integrated protection relay, the second overcurrent integrated protection relay, the third overcurrent integrated protection relay, the first differential relay, and the second differential relay respectively.

9. The urban rail transit relay protection training device according to claim 8, characterized in that, The control management module includes a power supply terminal, and the power switch module is connected to the power supply terminal of the control management module, and simultaneously controls the power supply to and from the control management module and the human-machine interface.

10. The urban rail transit relay protection training device according to claim 1, characterized in that, The relay protection module and the control management module are installed inside the cabinet.

Images