Capacitor impedance monitoring system

Abstract

The utility model discloses a capacitor impedance monitoring system, including the sampling circuit board, CPU circuit board, communication circuit board, switching value circuit board of setting in the shell, sampling circuit board, CPU circuit board, communication circuit board and switching value circuit board all are provided with the connecting row female, be provided with the flat cable for connecting together in the shell of circuit board, both ends of flat cable all are provided with the connecting row pin matched with the connecting row female, and the connecting row pin is fixed on the lateral surface of shell, and each connecting row pin is fixed at the position corresponding with the corresponding circuit board in the shell and sets up towards the connecting row female of corresponding circuit board. Through setting sampling circuit board, CPU circuit board, communication circuit board, switching value circuit board, can detect each electric power operation data through connecting with the sensor in the electric cabinet, when appearing abnormal parameter, can deliver abnormal information, and can cut off electric power fast, avoid the accident to take place.

Description

Technical Field

[0001] This utility model relates to the field of electrical system technology. Specifically, it relates to a capacitor impedance monitoring system. Background Technology

[0002] In engineering applications, parallel capacitor banks inevitably encounter problems such as capacitor capacitance decay, capacitor breakdown, inter-turn short circuits in reactors, and discharge coil failures. These issues cause the system's operating frequency to approach the resonant frequency, resulting in series resonance. Under series resonance conditions, the circuit impedance formed by the capacitor bank and reactor bank is very low, leading to a sharp increase in current, excessive voltage, further damage to internal components, and even a fire in the compensation cabinet, causing significant property damage and safety hazards. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to provide a capacitor impedance monitoring system that can monitor various parameters of a capacitor in real time.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a capacitor impedance monitoring system, including a sampling circuit board, a CPU circuit board, a communication circuit board, and a switching circuit board disposed within a housing. Each of the sampling circuit board, CPU circuit board, communication circuit board, and switching circuit board is provided with a connecting female. A ribbon cable for connecting the circuit boards is disposed within the housing. Both ends of the ribbon cable are provided with connecting pins that match the connecting females. The connecting pins are fixed to one side wall of the housing. Each connecting pin is fixed at a position corresponding to the corresponding circuit board within the housing and faces the connecting female of the corresponding circuit board. After the sampling circuit board, CPU circuit board, communication circuit board, and switching circuit board are inserted into the housing, the connecting females on the sampling circuit board, CPU circuit board, communication circuit board, and switching circuit board respectively connect to the corresponding connecting pins to achieve interconnection of the circuit boards. A touch screen is disposed on the front panel of the housing. The touch screen is communicatively connected to the CPU circuit board. Limiting blocks are provided on the front panel corresponding to each circuit board. When the front panel is mounted on the housing, the limiting blocks abut against the circuit board.

[0005] In the above-mentioned capacitor impedance monitoring system, the sampling circuit board is communicatively connected to the CPU circuit board, and the CPU circuit board is communicatively connected to the communication circuit board and the switch circuit board.

[0006] In the aforementioned capacitor impedance monitoring system, sampling circuit board slots, communication circuit board slots, and switching circuit board slots are arranged sequentially from top to bottom on both sides of the outer casing. Sliding protective sleeves are fitted on both sides of the sampling circuit board, the communication circuit board, and the switching circuit board. The two sides of the sampling circuit board are respectively inserted into two sampling circuit board slots, the two sides of the communication circuit board are respectively inserted into two communication circuit board slots, and the two sides of the switching circuit board are respectively inserted into two switching circuit board slots.

[0007] In the aforementioned capacitor impedance monitoring system, fixing holes are provided on both sides of the outer casing, and the fixing holes are located between the sampling circuit board slot and the communication circuit board slot; fixing plates are fixedly installed on both sides of the CPU circuit board, and locking pins are slidably provided through the fixing plates; the fixing plates are attached to the inner side wall of the outer casing, and the locking pins pass through the fixing plates and are inserted into the fixing holes.

[0008] In the aforementioned capacitor impedance monitoring system, the sampling circuit board, CPU circuit board, communication circuit board, and switch circuit board are all provided with connection females on the side of the rear base plate facing the housing. Connection pins are fixed on the rear base plate at positions corresponding to the sampling circuit board, the CPU circuit board, the communication circuit board, and the switch circuit board, and the connection pins are plugged into the connection females.

[0009] In the aforementioned capacitor impedance monitoring system, the rear base plate is fastened to the rear end face of the housing and fixedly connected by screws, and the front panel is fastened to the front end face of the housing and fixedly connected by screws.

[0010] In the aforementioned capacitor impedance monitoring system, connector mounting holes are provided on the rear bottom plate of the housing at positions corresponding to the sampling circuit board, communication circuit board, and switch circuit board. Connectors are installed on the sampling circuit board, the communication circuit board, and the switch circuit board. The connectors extend out of the housing through the connector mounting holes. The sampling circuit board is connected to the sensor through the connector, the communication circuit board is connected to the communication module through the connector, and the switch circuit board is connected to the electrical system execution component through the connector.

[0011] In the aforementioned capacitor impedance monitoring system, an elastic locking block is provided on the bottom of the connector. After the connector passes through the connector mounting hole, the elastic locking block is attached to the outer wall surface of the rear base plate.

[0012] In the aforementioned capacitor impedance monitoring system, a row of heat dissipation holes is provided on both sides of the housing near the sampling circuit board, communication circuit board, and switch circuit board.

[0013] In the aforementioned capacitor impedance monitoring system, the limiting top block is a rubber column, and an opening is provided on one end of the limiting top block facing into the outer shell. The direction of the opening is parallel to that of the circuit board, and the edge of the circuit board is inserted into the opening at the end of the limiting top block.

[0014] The technical solution of this utility model has achieved the following beneficial technical effects:

[0015] By setting up sampling circuit boards, CPU circuit boards, communication circuit boards, and switch circuit boards, various power operation data can be detected after connecting with sensors inside the electrical cabinet. When abnormal parameters occur, abnormal information can be transmitted, and power can be quickly cut off to prevent accidents.

[0016] By setting up circuit board slots that facilitate assembly, and using pre-positioned connector pins and connector nuts, the circuit board can be connected simultaneously after it is installed in place, achieving efficient assembly without any assembly errors. Attached Figure Description

[0017] Figure 1 A front perspective view of this utility model;

[0018] Figure 2 Rear perspective view of this utility model;

[0019] Figure 3 A three-dimensional schematic diagram of the interior of the outer shell of this utility model;

[0020] Figure 4 A three-dimensional schematic diagram of the front panel of this utility model;

[0021] Figure 5 A three-dimensional schematic diagram of the switching circuit board of this utility model;

[0022] Figure 6 A three-dimensional schematic diagram of the CPU circuit board of this utility model;

[0023] Figure 7 A schematic diagram of the circuit board connection of this utility model.

[0024] The reference numerals in the diagram are as follows: 1-Outer shell; 2-Front panel; 3-Rear base plate; 4-Heat dissipation hole; 5-Touch screen; 6-Connector mounting hole; 7-Sampling circuit board slot; 8-Communication circuit board slot; 9-Switching circuit board slot; 10-Fixing hole; 11-Connecting pin header; 12-Limiting top block; 13-Switching circuit board; 14-CPU circuit board; 15-Connector; 16-Connecting female connector; 17-Sliding protective sleeve; 18-Fixing plate; 19-Locking pin; 20-Elastic locking block. Detailed Implementation

[0025] The capacitor impedance monitoring system in this embodiment, such as Figure 1-3 As shown, the system includes a sampling circuit board, a CPU circuit board 14, a communication circuit board, and a digital input circuit board 13, all housed within the housing 1. Each of these circuit boards has a connector 16. A ribbon cable is installed inside the housing 1 to connect the circuit boards. Both ends of the ribbon cable have connector pins 11 that match the connector 16. The connector pins 11 are fixed to one side wall of the housing 1. Each connector pin 11 is fixed at a position corresponding to the corresponding circuit board within the housing 1 and faces the connector 16 of that circuit board. After the sampling circuit board, CPU circuit board 14, communication circuit board, and digital input circuit board 13 are inserted into the housing 1, the connector 16 on each circuit board connects to the corresponding connector pin 11, thus connecting the circuit boards. A touchscreen 5 is installed on the front panel 2 of the housing 1. The touchscreen 5 is communicatively connected to the CPU circuit board 14. Limiting blocks 12 are provided on the front panel 2 for each circuit board. When the front panel 2 is mounted on the housing 1, the limiting blocks 12 abut against the circuit board.

[0026] Specifically, such as Figure 3 As shown, sampling circuit board slots 7, communication circuit board slots 8, and switch circuit board slots 9 are arranged sequentially from top to bottom on both sides of the outer casing 1. Sliding protective sleeves 17 are fitted on both sides of the sampling circuit board, communication circuit board, and switch circuit board 13. Each circuit board is inserted into the outer casing 1 from front to back, and the two sides of the circuit board slide into the circuit board slots 8. The two sides of the sampling circuit board are respectively inserted into two sampling circuit board slots 7, the two sides of the communication circuit board are respectively inserted into two communication circuit board slots 8, and the two sides of the switch circuit board 13 are respectively inserted into two switch circuit board slots 9.

[0027] like Figure 2-3 As shown, mounting holes 10 are provided on both sides of the outer casing 1, located between the sampling circuit board slot 7 and the communication circuit board slot 8. Mounting plates 18 are fixedly mounted on both sides of the CPU circuit board 14, with locking pins 19 extending through and sliding on the mounting plates 18. The mounting plates 18 are fitted against the inner sidewalls of the outer casing 1, and the locking pins 19 pass through the mounting plates 18 and are inserted into the mounting holes 10. Each circuit board is installed inside the outer casing 1 using a quick-plug method, making assembly simple and fast, and improving efficiency during subsequent maintenance.

[0028] like Figure 3 , Figure 5 and Figure 6As shown, the sampling circuit board, CPU circuit board 14, communication circuit board, and switch circuit board 13 are all equipped with connecting nuts 16 on the side of the rear base plate 3 facing the housing 1. Connecting pins 11 are fixed on the rear base plate 3 at positions corresponding to the sampling circuit board, the CPU circuit board 14, the communication circuit board, and the switch circuit board 13. The connecting pins 11 are inserted into the connecting nuts 16. By adopting a circuit board insertion method, since the position and direction of movement of each circuit board are fixed, the circuit board, after being installed in place, is synchronously connected to the preset pins to achieve electrical connection. Each position is preset, providing a foolproof design. If the circuit board is misaligned, it cannot be installed correctly; only correct installation will ensure proper placement and connection. The mechanical connection of the pins and nuts achieves the positioning of the circuit board. The pins and nuts are 2.54mm in diameter.

[0029] The sampling circuit board is communicatively connected to the CPU circuit board 14, and the CPU circuit board 14 is communicatively connected to the communication circuit board and the switch circuit board 13. A connector nut 16 is also provided on the side of the CPU circuit board 14 near the front panel 2. Connecting pins 11 are installed on the touch screen 5 facing the connector nut 16. When the front panel 2 is fastened to the housing 1, the connection is automatically established. The rear bottom plate 3 is fastened to the rear end face of the housing 1 and fixed with screws, and the front panel 2 is fastened to the front end face of the housing 1 and fixed with screws.

[0030] like Figure 2 , Figure 3 and Figure 5 As shown, connector mounting holes 6 are provided on the rear base plate 3 of the housing 1 at the positions corresponding to the sampling circuit board, communication circuit board, and switch circuit board 13. Connectors 15 are installed on the sampling circuit board, communication circuit board, and switch circuit board 13. The connectors 15 extend out of the housing 1 through the connector mounting holes 6. The sampling circuit board is connected to the sensor through the connectors 15, the communication circuit board is connected to the communication module through the connectors 15, and the switch circuit board 13 is connected to the electrical system execution components through the connectors 15. An elastic locking block 20 is provided on the bottom of the connector 15. After the connector 15 passes through the connector mounting hole 6, the elastic locking block 20 fits against the outer wall of the rear base plate 3. One side of the elastic locking block is inclined. When the connector 15 passes through the connector mounting hole 6, the hole wall compresses the elastic locking block through the inclined surface, causing it to contract. After the connector 15 passes through the mounting hole, the elastic locking block resets and locks the rear base plate 3.

[0031] The sampling circuit board connects to the PT and CT transformers installed in the compensation cabinet, receiving voltage and current signals and converting them into signals accepted by the CPU. Simultaneously, the sampling circuit board provides the DC power required for the entire system. Furthermore, it can be configured with temperature sensors to acquire temperature parameters at corresponding locations. The CPU circuit board 14 is responsible for collecting and calculating voltage and current parameters, calculating capacitance values ​​based on set parameters, and predicting whether the capacitance value will decay. The communication circuit board handles 485 communication and online program upgrades. The digital input circuit board 13 has 16 output channels and 4 input channels, connecting to external fast circuit breakers and other actuators to control the fast circuit breaker's operation and monitor its status. Upon detecting abnormal signals, it quickly cuts off the power supply to prevent accidents. The touchscreen 5 is used to set parameters and display parameters such as voltage, current, power, and capacitance value. By monitoring the operating parameters of the compensation cabinet, overcurrent protection, capacitor overvoltage protection, undervoltage protection, capacitor breakdown protection, phase loss protection, inter-turn short circuit protection of series reactor, and discharge coil fault protection are realized. Through the calculation and built-in prediction program of CPU circuit board 14, capacitance attenuation protection is further realized. The capacitance value change of capacitor bank is monitored in real time, and voltage harmonic over-limit protection, current harmonic over-limit protection, voltage imbalance protection, current imbalance protection, and open delta fault protection are also realized. When an abnormality occurs, the external fast circuit breaker is controlled by the switch circuit board 13 to cut off the power supply.

[0032] A row of heat dissipation holes 4 are provided on both sides of the outer casing 1, near the sampling circuit board, communication circuit board and switch circuit board 13. The limiting top block 12 is a rubber pillar. An opening is provided on the end of the limiting top block 12 facing the inside of the outer casing 1. The opening direction is parallel to the circuit board. The edge of the circuit board is inserted into the opening at the end of the limiting top block 12.

[0033] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A capacitor impedance monitoring system, characterized by, The system includes a sampling circuit board, a CPU circuit board (14), a communication circuit board, and a switch circuit board (13) housed within a housing (1). Each of these circuit boards has a connector (16). A ribbon cable for connecting the circuit boards is housed within the housing (1). Both ends of the ribbon cable have connector pins (11) that match the connector (16). The connector pins (11) are fixed to one side wall of the housing (1). Each connector pin (11) is fixed at a position corresponding to the corresponding circuit board within the housing (1) and faces the connector pin (16) of the corresponding circuit board. After the CPU circuit board (14), the communication circuit board and the switch circuit board (13) are inserted into the housing (1): the connecting pins (16) on the sampling circuit board, the CPU circuit board (14), the communication circuit board and the switch circuit board (13) are respectively connected to the corresponding connecting pins (11) to realize the interconnection of the circuit boards; a touch screen (5) is provided on the front panel (2) on the front of the housing (1), the touch screen (5) is connected to the CPU circuit board (14), and a limit block (12) is provided on the front panel (2) for each circuit board. When the front panel (2) is installed on the housing (1): the limit block (12) abuts against the circuit board.

2. The capacitor impedance monitoring system of claim 1, wherein, The sampling circuit board is communicatively connected to the CPU circuit board (14), and the CPU circuit board (14) is communicatively connected to the communication circuit board and the switch circuit board (13).

3. The capacitor impedance monitoring system of claim 1, wherein, The outer casing (1) has sampling circuit board slots (7), communication circuit board slots (8) and switching circuit board slots (9) arranged from top to bottom on both sides of its side walls. Sliding protective sleeves (17) are fitted on both sides of the sampling circuit board, the communication circuit board and the switching circuit board (13). The two sides of the sampling circuit board are respectively inserted into two sampling circuit board slots (7), the two sides of the communication circuit board are respectively inserted into two communication circuit board slots (8), and the two sides of the switching circuit board (13) are respectively inserted into two switching circuit board slots (9).

4. The capacitor impedance monitoring system of claim 3, wherein, Fixing holes (10) are provided on both sides of the outer casing (1). The fixing holes (10) are located between the sampling circuit board slot (7) and the communication circuit board slot (8). Fixing plates (18) are fixedly installed on both sides of the CPU circuit board (14). Locking pins (19) are slidably provided through the fixing plates (18). The fixing plates (18) are attached to the inner side wall of the outer casing (1). The locking pins (19) pass through the fixing plates (18) and are inserted into the fixing holes (10).

5. The capacitor impedance monitoring system of claim 4, wherein, The sampling circuit board, CPU circuit board (14), communication circuit board and switch circuit board (13) are all provided with a connecting nut (16) on the side of the rear base plate (3) facing the outer shell (1). The rear base plate (3) is fixed with a connecting pin (11) at the position corresponding to the sampling circuit board, the position corresponding to the CPU circuit board (14), the position corresponding to the communication circuit board and the position corresponding to the switch circuit board (13). The connecting pin (11) is inserted into the connecting nut (16).

6. The capacitor impedance monitoring system of claim 5, wherein, The rear bottom plate (3) is fastened to the rear end face of the outer shell (1) and fixedly connected by screws, and the front panel (2) is fastened to the front end face of the outer shell (1) and fixedly connected by screws.

7. The capacitor impedance monitoring system of claim 1, wherein, Connector mounting holes (6) are provided on the rear bottom plate (3) of the housing (1) at the positions corresponding to the sampling circuit board, communication circuit board and switch circuit board (13). Connectors (15) are installed on the sampling circuit board, the communication circuit board and the switch circuit board (13). The connectors (15) extend out of the housing (1) through the connector mounting holes (6). The sampling circuit board is connected to the sensor through the connectors (15). The communication circuit board is connected to the communication module through the connectors (15). The switch circuit board (13) is connected to the electrical system execution component through the connectors (15).

8. The capacitor impedance monitoring system of claim 7, wherein, An elastic locking block (20) is provided on the bottom of the connector (15). After the connector (15) passes through the connector mounting hole (6), the elastic locking block (20) is attached to the outer wall of the rear bottom plate (3).

9. The capacitor impedance monitoring system of claim 1, wherein, A row of heat dissipation holes (4) is provided on both sides of the outer casing (1) near the sampling circuit board, communication circuit board and switch circuit board (13).

10. The capacitor impedance monitoring system of claim 1, wherein, The limiting top block (12) is a rubber column. The limiting top block (12) has an opening at one end facing the inside of the outer shell (1). The opening is parallel to the circuit board, and the edge of the circuit board is inserted into the opening at the end of the limiting top block (12).

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