Monitoring terminal of power distribution cabinet

Abstract

The invention discloses a monitoring terminal for a power distribution cabinet, and the terminal comprises an environment monitoring module which is used for the information collection of access control, water immersion, smoke sensing and gas in a power distribution room; the power distribution cabinet monitoring module is used for monitoring operation parameters, overvoltage, undervoltage, current, power and operation state of a power distribution loop; and the video monitoring module is used for real-time monitoring in the power distribution room. Through cooperative operation of the environment monitoring module, the power distribution cabinet monitoring module and the fault alarm module, breakthrough improvement of safety protection and operation and maintenance efficiency of the power distribution system is realized, and when environmental parameters are abnormal, the system is linked with video monitoring focusing and executes power cut-off / ventilation operation in an extremely short time, so that the rate of environment-related accidents is reduced, and the safety of the power distribution system is improved. And the circuit breaker health degree analysis module constructs an Hcb quantitative model based on parameters such as contact wear rate and operation times, so that the prediction accuracy is improved, the replacement period of the circuit breaker is prolonged, and the cost of spare parts is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution cabinets, and in particular to a monitoring terminal for a power distribution cabinet. Background Art

[0002] The distribution cabinet is a general term for the motor control center. The distribution cabinet is used in situations where the load is relatively dispersed and there are fewer circuits, while the motor control center is used in situations where the load is concentrated and there are more circuits. In the environment where the distribution cabinet is installed, many factors are related to the safe use of the distribution cabinet.

[0003] Currently, environmental monitoring (water / smoke detection), electrical parameters (voltage / current), and equipment health diagnosis (circuit breakers / transformers) in distribution rooms belong to independent subsystems. As a result, the power supply cannot be cut off in the event of water immersion in the guide column, and manual intervention is required. When the circuit breaker status is abnormal, the associated video cannot be automatically retrieved. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a monitoring terminal for a power distribution cabinet to solve the problems raised in the above background technology.

[0005] A monitoring terminal for a power distribution cabinet, comprising:

[0006] Environmental monitoring module, used for access control, water immersion, smoke detection, and gas information collection in the power distribution room;

[0007] The power distribution cabinet monitoring module is used to monitor the power distribution circuit operating parameters, voltage overvoltage, undervoltage, current, power, and operating status;

[0008] Video surveillance module, used for real-time monitoring in the power distribution room;

[0009] The circuit breaker health analysis module is used to evaluate the health status of the intelligent circuit breaker, including contact wear rate, number of operations, number of trips, and aging rate analysis;

[0010] Transformer monitoring module, used to monitor the real-time operation of the transformer;

[0011] Power quality analysis module, integrating harmonic distortion calculation module and three-phase imbalance analysis module;

[0012] Transmission module, supporting dual-channel communication of Modbus TCP protocol and IEC 61850 protocol;

[0013] A display module is used to display information transmitted by the environmental monitoring module, the distribution cabinet monitoring module, the video monitoring module, the circuit breaker health analysis module, the transformer monitoring module, and the power quality analysis module through the transmission module;

[0014] The fault alarm module is used to issue an alarm when the information displayed on the display module exceeds the set value.

[0015] Preferably, the environment monitoring module includes an access control sensor, a smoke sensor, a water immersion sensor and a gas sensor.

[0016] Preferably, the power distribution cabinet monitoring module includes a circuit operation parameter module, a voltage overvoltage monitoring module, a voltage undervoltage monitoring module, a current monitoring module, a power monitoring module and an operation status monitoring module.

[0017] Preferably, the transformer monitoring module includes a winding temperature sensing module, a core temperature sensing module and an oil level monitoring module.

[0018] Preferably, the calculation model of the circuit breaker health analysis module is: H_cb=1-(α·W+β·O+γ·T+δ·A), where:

[0019] W = (R_c - R_{c0}) / R_{cmax} (contact wear rate)

[0020] O = N_{op} / 10000 (operation number coefficient)

[0021] T = N_{trip} / 500 (tripping frequency coefficient)

[0022] A = (T_{current} - 25) / 60 (aging rate, T_{current} is the current temperature)

[0023] Weight coefficient α=0.35, β=0.25, γ=0.3, δ=0.1;

[0024] When H_cb≤0.6, a maintenance alarm is triggered.

[0025] Preferably, the overload prediction algorithm of the distribution cabinet monitoring module is: Overload_Risk=0.7×|dI / dt|+0.2×ΔT+0.1×|dU / dt|;

[0026] When Overload_Risk>0.85 and lasts for 5 seconds, a LEVEL_1 alarm is triggered.

[0027] Beneficial effects of the present invention: The present invention achieves a breakthrough improvement in the safety protection and operation and maintenance efficiency of the distribution system through the coordinated operation of the environmental monitoring module, the distribution cabinet monitoring module and the fault alarm module. When the environmental parameters are abnormal, the system links the video monitoring focus and executes the power cut-off / ventilation operation in a very short time, thereby reducing the rate of environmental-related accidents. The circuit breaker health analysis module constructs an H_cb quantitative model based on parameters such as contact wear rate and number of operations, which improves the prediction accuracy, promotes the extension of the circuit breaker replacement cycle, reduces the spare parts cost, and warns of overload risks 5 seconds in advance. The power quality analysis module uses a 4096-point FFT for precise harmonic calculation. When THD is greater than 8%, it automatically generates a treatment plan, which helps improve the power quality qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of the present invention.

[0029] In the figure: 101-environmental monitoring module, 1011-access control sensor, 1012-smoke sensor, 1013-water immersion sensor, 1014-gas sensor, 102-distribution cabinet monitoring module, 1021-circuit operation parameter module, 1022-voltage overvoltage monitoring module, 1023-undervoltage monitoring module, 1024-current monitoring module, 1025-power monitoring module, 1026-operation status monitoring module, 103-video monitoring module, 104-circuit breaker health analysis module, 105-transformer monitoring module, 106-power quality analysis module, 107-transmission module, 108-display module, 109-fault alarm module. DETAILED DESCRIPTION

[0030] In order to better understand the purpose, structure and function of the present invention, a monitoring terminal for a power distribution cabinet of the present invention is further described in detail below with reference to the accompanying drawings.

[0031] See also Figure 1 , a monitoring terminal for a power distribution cabinet, comprising:

[0032] Environmental monitoring module 101, which includes an access control sensor 1011, a smoke sensor 1012, a water immersion sensor 1013, and a gas sensor 1014, and is used to collect access control, water immersion, smoke, and gas information in the power distribution room. The access control sensor 1011, the water immersion sensor 1013, and the smoke sensor 1012 collect environmental data in real time. The water immersion sensor 1013 detects changes in ground impedance every 500ms, and the threshold is triggered when the impedance value is ≤50kΩ. The smoke sensor 1012 uses the laser scattering principle and issues an alarm when the particle concentration is greater than 0.5dB / m for 2s. The gas sensor 1014 detects combustible / toxic gases. The gas sensor 1014 detects H2 / CO with a resolution of 1ppm. Exceeding the concentration limit triggers the ventilation system.

[0033] The power distribution cabinet monitoring module 102 includes a circuit operating parameter module 1021, a voltage overvoltage monitoring module 1022, a voltage undervoltage monitoring module 1023, a current monitoring module 1024, a power monitoring module 1025, and an operating status monitoring module 1026, which are used to monitor the operating parameters, voltage overvoltage, undervoltage, current, power, and operating status of the distribution circuit. The overload prediction algorithm of the power distribution cabinet monitoring module 102 is: Overload_Risk = 0.7×|dI / dt|+0.2×ΔT+0.1×|dU / dt|;

[0034] When Overload_Risk>0.85 and lasts for 5 seconds, a LEVEL_1 alarm is triggered;

[0035] Video monitoring module 103, used for real-time monitoring in the power distribution room;

[0036] The circuit breaker health analysis module 104 is used to evaluate the health status of the intelligent circuit breaker, including contact wear rate, number of operations, number of trips, and aging rate analysis. The calculation model of the circuit breaker health analysis module 104 is: H_cb = 1-(α·W+β·O+γ·T+δ·A), where:

[0037] W = (R_c - R_{c0}) / R_{cmax} (contact wear rate)

[0038] O = N_{op} / 10000 (operation number coefficient)

[0039] T = N_{trip} / 500 (tripping frequency coefficient)

[0040] A = (T_{current} - 25) / 60 (aging rate, T_{current} is the current temperature)

[0041] Weight coefficient α=0.35, β=0.25, γ=0.3, δ=0.1;

[0042] When H_cb≤0.6, a maintenance alarm is triggered;

[0043] Transformer monitoring module 105, which includes a winding temperature sensing module, a core temperature sensing module, and an oil level monitoring module, and is used to monitor the real-time operation of the transformer;

[0044] Power quality analysis module 106, integrating harmonic distortion rate calculation module and three-phase imbalance analysis module;

[0045] The transmission module 107 supports dual-channel communication of the Modbus TCP protocol and the IEC 61850 protocol;

[0046] Display module 108, used to display information transmitted by environment monitoring module 101, distribution cabinet monitoring module 102, video monitoring module 103, circuit breaker health analysis module 104, transformer monitoring module 105, and power quality analysis module 106 through transmission module 107;

[0047] The fault alarm module 109 is used to generate an alarm when the information displayed on the display module 108 exceeds a set value.

[0048] The power distribution cabinet monitoring terminal of the present invention achieves panoramic monitoring and intelligent decision-making of the power distribution system through a highly integrated modular architecture. After the terminal is started, the environmental monitoring module 101 is the first to enter the working state. The access control sensor 1011 detects the opening and closing status of the cabinet door in real time and records the timestamp. The water immersion sensor 1013 measures the ground impedance value with a 500ms period (threshold ≤ 50kΩ triggers an alarm). The smoke sensor 1012 monitors the concentration of particulate matter in the air based on the laser scattering principle (>0.5dB / m for 2s to trigger an alarm). The gas sensor 1014 detects the H2 / CO concentration using an electrochemical cell (resolution 1ppm). The above environmental data is synchronously transmitted to the display module 108 via the transmission module 107 along with the electrical parameters collected by the power distribution cabinet monitoring module 102 for display. The current monitoring unit 1024 captures the instantaneous current at a sampling rate of 10kHz and calculates the differential value dI / dt. The voltage overvoltage / undervoltage monitoring unit samples 128 points per cycle to track voltage fluctuations. When |dU / dt| > 5V / ms is detected, it is marked as a voltage mutation event.

[0049] The key algorithm layer then initiates dynamic analysis: In the circuit breaker health analysis module 104, the microprocessor calculates the health index according to the formula H_cb = 1-(0.35W + 0.25O + 0.3T + 0.1A) based on parameters such as contact wear rate W = (R_c-R_c0) / R_cmax (R_c0 is the initial contact resistance), operation number coefficient O = N_op / 10000, tripping number coefficient T = N_trip / 500, and temperature aging rate A = (T_current-25) / 60. When H_cb ≤ 0.6, a maintenance work order is immediately generated.

[0050] At the same time, the distribution cabinet monitoring module 102 performs overload risk prediction: Overload_Risk=0.7×|dI / dt|+0.2×ΔT+0.1×|dU / dt| (ΔT is taken from the temperature sensor in the cabinet) is updated every 100ms. If the value is greater than 0.85 and lasts for 5 seconds (50 consecutive samplings exceed the standard), a LEVEL_1 level warning is sent to the fault alarm module (109).

[0051] The transformer monitoring module 105 monitors the winding temperature gradient through an embedded PT100 platinum resistor (accuracy ±0.5°C), and activates the cooling system when the temperature change rate is greater than 15°C / h.

[0052] The power quality analysis module 106 simultaneously processes high-frequency data: it collects 256 power frequency cycle waveforms (approximately 5.12 seconds) and performs a 4096-point FFT transform. If the THD is greater than 8%, it automatically outputs a filter capacitor configuration plan (such as a 200μF @ 7th harmonic filter in parallel on the bus side). All data is aggregated to the display module 108 via dual communication channels (Modbus TCP protocol is used for conventional data transmission, and IEC 61850 protocol ensures emergency instructions with a delay of less than 4ms) via the transmission module 107. When the environmental monitoring module triggers an alarm (such as a flood alarm), the system completes a three-level linkage within 0.5 seconds:

[0053] 1. Instruct the video monitoring module (103) to focus on the event area;

[0054] 2. Send a trip command to the intelligent circuit breaker;

[0055] 3. Start the drainage pump.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A monitoring terminal for a power distribution cabinet, characterized in that: include: Environmental monitoring module (101), used for collecting access control, water immersion, smoke detection and gas information in the power distribution room; A power distribution cabinet monitoring module (102) is used to monitor the power distribution circuit operating parameters, voltage overvoltage, undervoltage, current, power, and operating status; Video monitoring module (103), used for real-time monitoring in the power distribution room; A circuit breaker health analysis module (104) is used to evaluate the health status of the intelligent circuit breaker, including contact wear rate, number of operations, number of trips and aging rate analysis; A transformer monitoring module (105) is used to monitor the real-time operation of the transformer; A power quality analysis module (106) integrating a harmonic distortion rate calculation module and a three-phase imbalance analysis module; A transmission module (107) supports dual-channel communication of Modbus TCP protocol and IEC 61850 protocol; A display module (108) is used to display information transmitted by the environment monitoring module (101), the power distribution cabinet monitoring module (102), the video monitoring module (103), the circuit breaker health analysis module (104), the transformer monitoring module (105), and the power quality analysis module (106) via the transmission module (107); The fault alarm module (109) is used to issue an alarm when the information displayed on the display module (108) exceeds a set value.

2. The monitoring terminal for a power distribution cabinet according to claim 1, characterized in that: The environment monitoring module (101) comprises an access control sensor (1011), a smoke sensor (1012), a water immersion sensor (1013) and a gas sensor (1014).

3. The monitoring terminal for a power distribution cabinet according to claim 1, characterized in that: The power distribution cabinet monitoring module (102) comprises a circuit operation parameter module (1021), an overvoltage monitoring module (1022), an undervoltage monitoring module (1023), a current monitoring module (1024), a power monitoring module (1025) and an operation status monitoring module (1026).

4. The monitoring terminal for a power distribution cabinet according to claim 1, characterized in that: The transformer monitoring module (105) comprises a winding temperature sensing module, an iron core temperature sensing module and an oil level monitoring module.

5. The monitoring terminal for a power distribution cabinet according to claim 1, characterized in that: The calculation model of the circuit breaker health analysis module (104) is: H_cb=1-(α·W+β·O+γ·T+δ·A), where: W = (R_c - R_{c0}) / R_{cmax} (contact wear rate) O = N_{op} / 10000 (operation number coefficient) T = N_{trip} / 500 (tripping frequency coefficient) A = (T_{current} - 25) / 60 (aging rate, T_{current} is the current temperature) Weight coefficient α=0.35, β=0.25, γ=0.3, δ=0.1; When H_cb≤0.6, a maintenance alarm is triggered.

6. The monitoring terminal for a power distribution cabinet according to claim 1, characterized in that: The overload prediction algorithm of the distribution cabinet monitoring module (102): Overload_Risk=0.7×|dI / dt|+0.2×ΔT+0.1×|dU / dt|; When Overload_Risk>0.85 and lasts for 5 seconds, a LEVEL_1 alarm is triggered.

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