Online monitoring device for mechanical characteristics of high-voltage switch cabinet

Abstract

The utility model discloses an on-line monitoring device for mechanical characteristics of a high-voltage switch cabinet. The on-line monitoring device comprises a closing command access signal, an opening command access signal, an A-phase displacement sensor, a B-phase displacement sensor, a C-phase displacement sensor, a microprocessor module, a power supply module, an address module, a storage module and a clock module. The device provided by the utility model is combined with an opening and closing command signal, obtains the opening and closing time by measuring the time difference between the jump start and the change end of the voltage division signal output after the excitation voltage is applied to the stroke displacement sensor, and can greatly improve the index precision of measuring the average opening and closing speed, the opening and closing time and the like of the mechanical characteristics of the circuit breaker.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -voltage switchgear's monitoring technical field, concretely is a kind of high -voltage switchgear mechanical characteristic on -line monitoring device. BACKGROUND

[0002] Mechanical characteristic is the important index reflecting the mechanical performance of switchgear equipment, and for high-voltage switchgear, the mechanical characteristic parameters of its circuit breaker are crucial to ensure the stable operation of power system. The traditional measurement method controls the opening and closing coil through intermediate relay, and measures the time difference from opening and closing command sending time to position signal feedback time to calculate opening and closing action time, but due to the delay of intermediate relay action time, there is a certain deviation in the measurement result. SUMMARY

[0003] In order to solve the above problems, the utility model provides a kind of high -voltage switchgear mechanical characteristic on -line monitoring device, the device obtains the opening and closing time by measuring the time difference of the jump start and change end of the voltage division signal output after the excitation voltage of stroke displacement sensor, thereby improving the measurement accuracy.

[0004] The technical scheme of the utility model is as follows:

[0005] A kind of high -voltage switchgear mechanical characteristic on -line monitoring device, including opening command access signal, closing command access signal, A phase displacement sensor, B phase displacement sensor, C phase displacement sensor, microprocessor module, power module, address module, storage module and clock module.

[0006] Opening command access signal and closing command access signal are connected with the input end I / O port of microprocessor module respectively, for receiving opening and closing command.

[0007] A phase displacement sensor, B phase displacement sensor, C phase displacement sensor are connected with the input end A / D port of microprocessor module respectively, for measuring the stroke displacement of circuit breaker.

[0008] Power module, its output end is connected with the power interface of microprocessor module corresponding, for providing the power required by device;

[0009] Address module, its output end is connected with the input end I / O port of microprocessor module, for setting and identifying device address;

[0010] Storage module, its input end is connected with the output end I / O port of microprocessor module, for storing monitoring data;

[0011] Clock module, its output end is connected with the input end I / O port of microprocessor module, for providing time information.

[0012] Further, the opening command access signal and the closing command access signal adopt passive contact relays to ensure the stability and reliability of the signals. The A-phase displacement sensor, the B-phase displacement sensor and the C-phase displacement sensor adopt 10kΩ slide wire potentiometers with a length of 50mm and are installed on the pull rod at the lower end of the vacuum bubble of the circuit breaker to measure the displacement of the circuit breaker.

[0013] The power module adopts an AP12N24-ZERO type high-performance isolation power module to convert the 220V / 50Hz AC power into 12VDC, and includes a lightning protection and surge protection circuit, a differential mode / common mode filter circuit, and circuit elements for suppressing surge current and overvoltage, to improve the electromagnetic interference immunity and electromagnetic compatibility of the device.

[0014] The clock module adopts a DS1302 chip to provide accurate time information. The address module adopts a 12-bit dial switch to set and identify the device address. The storage module adopts a 32GB U disk to store a large amount of monitoring data. The microprocessor module adopts an STM32F407VGT6 as a microprocessor to process and analyze the data collected by the sensor and control the work of other modules.

[0015] The beneficial effects of the utility model are:

[0016] The device can monitor the mechanical characteristic parameters of the circuit breaker in the high-voltage switch cabinet in real time, such as the opening and closing time and the average opening and closing speed, and improve the measurement accuracy. At the same time, the device has the advantages of strong anti-electromagnetic interference ability, good electromagnetic compatibility, etc., and is suitable for monitoring the needs of various high-voltage switch cabinets. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of an embodiment of the utility model;

[0018] Figure 2 is a closing moving contact stroke curve diagram;

[0019] Figure 3 is an opening moving contact stroke curve diagram;

[0020] Figure 4 is a 220VAC to 12VDC circuit schematic diagram;

[0021] Figure 5 is a 12VDC to 5VDC circuit schematic diagram;

[0022] Figure 6 is a 5VDC to 3.3VDC circuit schematic diagram;

[0023] Figure 7 is a microprocessor module schematic diagram. DETAILED DESCRIPTION

[0024] The utility model will be described further in connection with the drawings. The following examples are only used to make the technical scheme of the utility model more clear, and cannot limit the protection scope of the utility model. Embodiment

[0025] The embodiment provides a high-voltage switch cabinet mechanical characteristic on-line monitoring device, and its structure is shown in the figure. Figure 1 The device comprises a tripping command access signal, a closing command access signal, an A-phase displacement sensor, a B-phase displacement sensor, a C-phase displacement sensor, a microprocessor module, a power module, an address module, a storage module and a clock module.

[0026] As shown in the figure, the tripping command access signal and the closing command access signal are respectively passive contact relays, and are connected with the input I / O port of the microprocessor module. The A-phase displacement sensor, the B-phase displacement sensor and the C-phase displacement sensor are respectively 10kΩ slide wire potentiometers with a length of 50mm, and are installed on the lower end pull rod of the circuit breaker vacuum bubble by using a support, and are connected with the input A / D port of the microprocessor module. Figures 2-3

[0027] The power module adopts an AP12N24-ZERO type high-performance isolation power module, converts 220V / 50Hz alternating current into 12VDC, and comprises a lightning protection surge protection circuit and a differential mode / common mode filter circuit, and circuit elements for suppressing surge current and overvoltage (as shown in the figure). Figure 4 At the same time, the 220VAC to 12VDC circuit has an input side fuse F1 and a power type thermistor R29 in series at the input end, so as to suppress the surge current in the power-on moment; when there is an abnormal overvoltage input, the varistor R30 will immediately reduce the resistance value, so as to suppress the interference of overvoltage on the subsequent circuit; the common mode inductor LCM1 can not only attenuate external common mode electromagnetic interference, but also suppress the electromagnetic interference released by the receiver itself.

[0028] Since the external equipment needs 5V voltage, and the working voltage of the STM32 is 3.3V, the LM2596-5.0 and LMS1117-3.3 power chip are adopted to realize the conversion of 12VDC to 5VDC (as shown in the figure), and 5VDC to 3.3VDC (as shown in the figure). Figure 5 Figure 6

[0029] ​​​The clock module adopts a DS1302 chip and is connected with the input I / O port of the microprocessor module. The address module adopts a 12-bit dial switch and is connected with the input I / O port of the microprocessor module. The storage module adopts a 32GB U disk and is connected with the output I / O port of the microprocessor module. The microprocessor module adopts an STM32F407VGT6 as a microprocessor (as shown in Figure 7 indicated), which is responsible for processing and analyzing the data collected by the sensor and controlling the work of other modules.

[0030] Through the technical scheme of the embodiment, the mechanical characteristic parameters of the circuit breaker in the high-voltage switch cabinet, such as the opening and closing time and the average opening and closing speed, can be monitored in real time, and the measurement accuracy is improved. Meanwhile, the device has the advantages of strong anti-electromagnetic interference ability and good electromagnetic compatibility, and is suitable for the monitoring requirements of various high-voltage switch cabinets.

[0031] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and deformations can be made without departing from the technical principles of the present application, and these improvements and deformations should also be regarded as the protection scope of the present application.

Claims

1. A high-voltage switchgear mechanical property on-line monitoring device, characterized in that, The device comprises a tripping command access signal, a closing command access signal, an A-phase displacement sensor, a B-phase displacement sensor, a C-phase displacement sensor, a microprocessor module, a power module, an address module, a storage module, and a clock module. The tripping command access signal and the closing command access signal are connected with the input I / O port of the microprocessor module. The A-phase displacement sensor, the B-phase displacement sensor, and the C-phase displacement sensor are connected with the input A / D port of the microprocessor module, and are used for measuring the displacement of the circuit breaker. The power module is connected with the corresponding power interface of the microprocessor module, and is used for providing the power required by the device. The address module is connected with the input I / O port of the microprocessor module, and is used for setting and identifying the address of the device. The storage module is connected with the output I / O port of the microprocessor module, and is used for storing the monitoring data. The clock module is connected with the input I / O port of the microprocessor module, and is used for providing time information.

2. The online monitoring device for mechanical properties of high voltage switchgear according to claim 1, characterized in that, The tripping command access signal and the closing command access signal are passive contact relays.

3. The online monitoring device for mechanical properties of high voltage switchgear according to claim 1, characterized in that, The A-phase displacement sensor, the B-phase displacement sensor, and the C-phase displacement sensor are 10kΩ slide wire potentiometers, which are installed on the pull rod at the lower end of the vacuum bubble of the circuit breaker.

4. The online monitoring device for mechanical properties of high voltage switchgear according to claim 1, characterized in that, The power module is an AP12N24-ZERO high-performance isolation power module, which converts the 220V / 50Hz AC power into 12VDC, and contains lightning protection, surge protection, differential mode / common mode filter circuits, and circuit elements for suppressing surge current and overvoltage.

5. The online monitoring device for mechanical properties of high voltage switchgear according to claim 1, characterized in that, The clock module uses a DS1302 chip.

6. The online monitoring device for mechanical properties of high voltage switchgear according to claim 1, characterized in that, The address module uses a 12-bit dial switch.

7. The online monitoring device for mechanical properties of high voltage switchgear according to claim 1, characterized in that, The microprocessor module uses an STM32F407VGT6 as the microprocessor.

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