CN205844484U - A kind of portable high-pressure breaker mechanic property tester - Google Patents

Abstract

The utility model discloses a portable high-voltage circuit breaker mechanical characteristic tester. The closing control circuit, the opening control circuit, the signal acquisition circuit, the optocoupler circuit, the SD card module, the display module, the real-time clock module and the key module are respectively connected with the main control The input terminals of the three optocoupler circuits are respectively connected to the A-phase, B-phase, and C-phase fracture signals, the Hall current sensor and the linear displacement sensor are respectively connected to the signal acquisition circuit, and the output terminal of the closing control circuit is connected to the closing coil , the output end of the opening control circuit is connected to the opening coil, the two Hall current sensors are used to collect the current of the closing coil and the opening coil, and the three linear displacement sensors are used to collect the A phase, B phase, and C phase respectively. The contact stroke, the aforementioned current value and stroke value are all sent to the signal acquisition circuit. This kind of tester can improve the problems of many operating procedures, complicated wiring and high cost of the existing test platform.

Description

A portable high-voltage circuit breaker mechanical characteristic tester

technical field

The utility model relates to a test device, in particular to a tester for the mechanical characteristics of a high-voltage circuit breaker.

Background technique

With the increasing development of smart grid, new requirements are constantly being put forward for the reliable operation of electrical equipment. High-voltage circuit breaker is the most important and complex electrical equipment in the power system, and it plays a key role in control and protection in the power system. The biggest feature of the circuit breaker is to disconnect the load current and short-circuit current in the circuit. Once the circuit breaker fails, it is easy to cause major accidents and seriously affect the stable operation of the power system. However, most of the faults of the circuit breaker occur in the mechanical part, including the jamming of the closing iron core, the loosening of the insulating rod, the falling off of the connecting rod pin of the operating mechanism, and the burning of the opening coil. The coil current waveform can reflect the movement state of the iron core and the state of the iron latch and valve connected to the core ejector rod, etc. After testing, these mechanical characteristic parameters should meet the standard requirements of IEC62271-100-2001:05 and GB1984-2003. By measuring the mechanical characteristics of the circuit breaker, on the one hand, it can be judged whether the technical parameters of the circuit breaker meet the requirements of the regulations, and provide a basis for whether the circuit breaker can be put into operation reliably. The focus of the overhaul.

At present, the circuit breaker mechanical characteristic testers developed at home and abroad mainly have the following disadvantages: 1) can only store the test data once, and the storage capacity of the internal memory is limited, which cannot meet the storage and query of large-capacity data; 2) Most of the data processing in the measuring instrument adopts PC, and the communication between the measuring instrument and the PC is carried out by serial port. With the increase of test data, the transmission data will become slower and slower, and the communication will take a long time, which cannot meet the system requirements; 3) The tester is bulky and inconvenient to carry, so it is not suitable for outdoor testing.

Utility model content

The purpose of this utility model is to provide a portable high-voltage circuit breaker mechanical characteristic tester, which can improve the problems of many operating procedures, complicated wiring and high cost of the existing test platform.

In order to achieve the above object, the solution of the present utility model is:

A portable high-voltage circuit breaker mechanical characteristic tester, including a main controller, a closing control circuit, an opening control circuit, a signal acquisition circuit, a Hall current sensor, a linear displacement sensor, an optocoupler circuit, an SD card module, a display module, The real-time clock module and the key module, wherein, the closing control circuit, the opening control circuit, the signal acquisition circuit, the optocoupler circuit, the SD card module, the display module, the real-time clock module and the key module are respectively connected with the main controller, and the 3 optical The input terminals of the coupling circuit are respectively connected to the A-phase, B-phase, and C-phase fracture signals, the Hall current sensor and the linear displacement sensor are respectively connected to the signal acquisition circuit, the output terminal of the closing control circuit is connected to the closing coil, and the opening control circuit The output end is connected to the opening coil, 2 Hall current sensors are used to collect the current of the closing coil and the opening coil, and 3 linear displacement sensors are used to collect the contact strokes of phase A, phase B, and phase C respectively. Values and travel values are sent to the signal acquisition circuit.

The above-mentioned main controller adopts TMS320F28335.

The above-mentioned signal acquisition circuit uses a 16-bit high-precision AD7606 sampling chip.

The optocoupler circuit includes a diode, a first optocoupler and a pull-up resistor. The anode of the diode is connected to the A-phase, B-phase or C-phase interface signal, and the cathode of the diode is connected to the first input terminal of the first optocoupler. The second input terminal is connected to the anode of the diode, the first output terminal of the first optocoupler is connected to the power supply through a pull-up resistor, the first output terminal of the first optocoupler is also connected to the main controller, and the second output terminal of the first optocoupler is grounded .

The optocoupler circuit above also includes a current limiting resistor connected between the A-phase, B-phase or C-phase breakout signal and the anode of the diode.

The above closing control circuit includes a second optocoupler, a voltage follower and a solid state relay, the first input end of the second optocoupler is connected to the power supply, the second input end is connected to the main controller, and the first output end of the second optocoupler is connected to the power supply , the second output terminal is connected to the negative input terminal of the voltage follower, the positive input terminal of the voltage follower is connected to the output terminal, and the output terminal of the voltage follower is also connected to the positive input terminal of the solid state relay, the negative input terminal of the solid state relay is grounded, and the solid state relay The output end of the relay is connected to the closing coil.

The above SD card module adopts Kingston 4GB SD card.

The SPI communication mode is adopted between the above-mentioned main controller and the SD card module.

The above-mentioned real-time clock module adopts DS1302 clock chip.

The SPI communication mode is adopted between the above-mentioned main controller and the real-time clock module.

After adopting the above scheme, the utility model considers storage, portability, and processing accuracy, uses the Hall current sensor GSM010-GT to detect the current signal of the closing (opening) gate coil, and uses the linear displacement sensor TS-0050 to detect the stroke of the moving contact. And use the 16-bit high-precision AD converter AD7606 to collect the above-mentioned signals to realize the measurement of parameters such as closing (opening) coil current and moving contact stroke, and at the same time use the optocoupler circuit to collect the opening and closing state of the fracture to realize the closing and opening time of the circuit breaker , Closing and opening synchronous parameter measurement. In addition, the system is expanded with LCD display, SD card storage and DS1302 clock circuit, the parameter measurement results can be directly displayed on the LCD, and the SD card storage of a large number of measurement parameters and measurement times can be realized. Finally, taking ABB's VD4/CX vacuum circuit breaker as the test object, the test results show that the tester can accurately measure the mechanical characteristic parameters of the circuit breaker, thus providing a reliable basis for judging the performance of the circuit breaker.

Description of drawings

Fig. 1 is a hardware structural diagram of the present utility model;

Fig. 2 is the circuit diagram of signal acquisition circuit in the utility model;

Fig. 3 is the circuit diagram of optocoupler circuit in the utility model;

Fig. 4 is the circuit diagram of closing control circuit in the utility model;

Fig. 5 is the circuit diagram of SD card module in the utility model;

Fig. 6 is the circuit diagram of the real-time clock module in the utility model;

Fig. 7 is the flow chart of the utility model work;

Fig. 8 is a graph of closing stroke and fracture state;

Fig. 9 is a closing current curve;

Fig. 10 is a graph of opening stroke and fracture state;

Fig. 11 is a graph of opening current.

detailed description

The technical solutions of the present utility model will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the utility model provides a portable high-voltage circuit breaker mechanical characteristic tester, including a main controller, a closing control circuit, an opening control circuit, a signal acquisition circuit, a Hall current sensor, a linear displacement sensor, an optical Coupling circuit, SD card module, display module, real-time clock module and key module, wherein, closing control circuit, opening control circuit, signal acquisition circuit, optocoupler circuit, SD card module, display module, real-time clock module and key module They are respectively connected to the main controller, the Hall current sensor and the linear displacement sensor are respectively connected to the signal acquisition circuit, the output end of the closing control circuit is connected to the closing coil, the output end of the opening control circuit is connected to the opening coil, and two Hall The current sensors are used to collect the current of the closing coil and the opening coil respectively, and the three linear displacement sensors are used to collect the strokes of the A-phase, B-phase, and C-phase contacts respectively, and the aforementioned current values and stroke values are sent to the signal collection circuit; Several of these components are described below.

1. Signal acquisition circuit

The signal acquisition circuit can use a 16-bit high-precision AD7606 sampling chip, which contains a second-order anti-aliasing filter. The voltage output by the Hall current sensor and the linear displacement sensor can be directly connected to the analog signal input pin of the chip, and can The 8-way analog channel signals are sampled synchronously, which solves the shortcoming that the TMS320F28335 controller can only realize synchronous sampling of two channels. The circuit diagram of AD7606 signal acquisition is shown in Figure 2. Among them, DB0~DB15 are 16-bit data buses, which are respectively connected to 16 external interface data terminals XD0 to XD15 of DSP. RANGE is the analog input range control pin. When connected to a high level, the acquisition voltage range can be set within the range of -10 to 10V. CS is the chip selection signal terminal, and BUSY is the AD conversion status terminal. When BUSY changes from high level to When it is low level, the AD conversion ends, and the data can be read from the output register of the control register. The AD conversion formula is as follows:

${\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; D.</span>}<span\; class="notranslate">\; *</span>{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; 32768</span>}}$

Wherein, U _o represents the output voltage of the sensor, D represents the AD sampling value, U ₁ represents the sampling range, and U ₁ =10V.

Pins V1, V2, and V3 are respectively connected to the voltage output terminals of A, B, and C three-phase TS-0050 linear displacement sensors. The sensor has a range of 51.8mm and is powered by 10V voltage. S is:

$\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; L</span>}}{{\mathrm{<span\; class="notranslate">\; u</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, U _o represents the output voltage of the sensor; L represents the full scale of the linear displacement sensor, and L=51.8mm; U ₂ represents the full scale voltage value of the linear displacement sensor, and U ₂ =10V.

Pins V4 and V5 are respectively connected to the converted output voltage signal of the GSM010GT Hall current sensor. The sensor outputs a reference voltage of 2.5V. According to the technical parameters of the sensor, the input-output relationship is as follows:

U _o ＝I _in *0.1+2.5

Among them, I _in represents the input current, that is, the coil current; U _o represents the output voltage of the sensor.

2. Optocoupler circuit

The utility model collects the state of the fracture through the optocoupler circuit. The schematic diagram is shown in Figure 3. Taking phase A as an example, R16 is the current limiting resistor, which limits the input current of the optocoupler and protects the optocoupler. When the circuit breaker is closed, phase A is connected to the ground, the optocoupler works, the transistor on the output side is turned on, and the GPIO10 pin of the DSP is at low level; otherwise, there is no voltage difference between the two ends of the optocoupler input side, and the optocoupler does not work , the transistor on the output side is not conducting, and the GPIO10 pin of the DSP is at a high level. The moment when the level of the GPIO10 pin changes is the closing (opening) moment of the circuit breaker. The optocoupler can realize the isolation between the input side of the optocoupler and the main controller, and reduce electromagnetic interference.

3. Closing/opening control circuit

The structure and principle of the closing control circuit and the opening control circuit are the same. Taking the closing control circuit as an example, the principle is shown in Figure 4. When the TMS320F28335 sends a closing command, the GPIO60 pin in the figure is at low level, the optocoupler works, and the voltage follower outputs the voltage to drive the solid state relay to work. When the gate circuit is turned on, the circuit breaker performs the closing action; on the contrary, when the GPIO60 pin is at a high level, the optocoupler does not work, the solid state relay does not conduct, and the mechanism does not perform the closing action.

4. SD card module

In order to realize the large-capacity storage of the test parameters, Kingston 4GB SD card is used to expand the system storage. The hardware wiring diagram of the SD card is shown in Figure 5. TMS320F28335 is the host, SD card is the slave, and SPI communication is used between the two. SPISOMIA is the host input/slave output line, SPISIMOA is the host output/slave output line, SPICLKA is the clock signal, and SPISTEA is the chip selection signal.

5. Real-time clock module

In order to record the test time and facilitate the analysis and integration of later data, this embodiment uses the DS1302 clock chip launched by DALLAS company to record the second, minute, hour, date, month and year information of the operation. The DS1302 clock circuit is shown in Figure 6. VCC1 is the main power supply of the system, and VCC2 is the backup power supply of the system. The internal trickle charger can be used to delay the service life of the backup battery. The SPI communication mode is used between DS1302 and TMS320F28335. RST is the reset terminal, which allows the I/O port to transmit data when it is high; I/O is the serial data input/output terminal; CLK is the synchronous clock pulse terminal, and the rising edge writes the I/O terminal data bit by bit into DS1302 , the falling edge makes DS1302 output data bit by bit to the I/O port.

When the utility model works, the flow chart can refer to shown in Figure 7. After the system is powered on, the system is initialized, including the initialization of the I/O port of the RS1302 clock chip, liquid crystal module, and SD card module, and the internal SPI module of the main controller. Initialization, the initialization of the timer T0, set the timer sampling period to 0.1ms; after the initialization is completed, perform corresponding operations according to the buttons, call the button query subroutine, and complete the setting of the test parameters, mainly including closing (opening) gates Sampling time setting and closing (opening) speed definition mode selection; then wait for the controller to issue a closing (opening) control command, taking closing as an example, when the closing command is detected, the RS1302 clock program is called to record the action At the same time, the closing sampling program is called to collect the current, stroke, and three-phase fracture status information of the closing coil. When the number of sampling times reaches the set value, the sampling ends; the parameter calculation subroutine is called to calculate the opening distance, closing (point) Brake time, closing (opening) speed, synchronism and other characteristic parameters; call the liquid crystal display program to display the fracture signal, travel curve, current waveform and report of closing and opening parameters; call the SD card subroutine to store the current value, travel value and characteristic parameters.

After the system is powered on, press the button to complete the system parameter setting, select the type of circuit breaker and the calculation method of closing (opening) speed, and then the main controller TMS320F28335 sends a closing (opening) control command, and the circuit breaker performs closing (opening) Action, to synchronously detect the closing (opening) three-phase moving contact stroke, closing (opening) coil current and fracture state of the circuit breaker. Among them, the stroke signal of the three-phase moving contact is converted into a three-way voltage signal by using a TS-0050 linear displacement sensor, and the current signal of the closing (opening) coil is converted into a voltage signal by using a GSM010GT Hall current sensor. These voltage analogs are all passed through the AD7606 It is collected and converted into digital quantity; the three-phase fracture state signal is converted into high and low level switching signal by optocoupler circuit. Then, TMS320F28335 synchronously collects digital and switch signals, and calculates the circuit breaker closing (opening) time, closing (opening) speed, stroke, synchronism, opening distance and other characteristic parameters according to the definition of high-voltage switch mechanical characteristic parameters in Table 1. . While measuring the mechanical characteristic parameters of the circuit breaker, the system uses the RS1302 clock module to record the time of the measurement. After the measurement, the mechanical characteristic parameters and measurement time are displayed on the LCD240128 and stored in the SD card storage module. Finally, in order to facilitate the tester to carry, the system power supply module is powered by a large-capacity battery.

Table 1

Taking ABB's VD4/CX 12.12.32 vacuum circuit breaker as the test object, the test closing (opening) trip, fracture status, and coil current information are displayed on the LCD, as shown in Figures 8 to 11. Through multiple closing (opening) gate experiments, the closing (opening) gate characteristic parameters were obtained, and compared with the test data of the GYT-07 characteristic tester of Xiamen Guoyi Technology Co., Ltd., as shown in Table 2-3, the obtained contact The maximum error of opening distance is 1.09%, the maximum error of stroke is 1.24%, the maximum error of closing (opening) gate time is 0.64%, the maximum error of synchronism is 3.61%, and the maximum error of maximum closing (opening) gate current is 2.33%. Experimental results show that the test results of this system have small error and high precision, which can correctly reflect the mechanical characteristics of the circuit breaker.

Table 2

Table 2

Based on the above, the utility model is a portable high-voltage circuit breaker mechanical characteristic tester, which integrates control, testing, data display, data processing, graphic display, and data storage, and can control the closing (opening) action of the circuit breaker, and can realize high-voltage Circuit breaker closing (opening) coil current, moving contact stroke, and fracture state signals are collected synchronously, and the data can be saved on the SD card, eliminating the dependence on the PC. The test results have high precision, the interface is simple and intuitive, easy to operate, and the system is stable. The system can accurately test the mechanical characteristics of the circuit breaker, thereby providing a reliable basis for condition-based maintenance, and has very broad market prospects and research significance.

The above embodiments are only to illustrate the technical ideas of the utility model, and cannot limit the protection scope of the utility model with this. Any changes made on the basis of the technical solutions according to the technical ideas proposed by the utility model all fall into the scope of the utility model. within the scope of the new protection.

Claims (10)

1. a portable high-pressure breaker mechanic property tester, it is characterised in that: include master controller, shutting-brake control electricity Road, sub-gate control circuit, signal acquisition circuit, Hall current sensor, linear displacement transducer, photoelectric coupled circuit, SD card module, Display module, real-time clock module and key-press module, wherein, contacting controling circuit, sub-gate control circuit, signal acquisition circuit, Photoelectric coupled circuit, SD card module, display module, real-time clock module and key-press module are connected with master controller respectively, 3 optocoupler electricity The input on road connects A phase, B phase, C phase fracture signal respectively, Hall current sensor and linear displacement transducer respectively with letter Number Acquisition Circuit connects, and the outfan of contacting controling circuit connects closing coil, and the outfan of sub-gate control circuit connects separating brake Coil, 2 Hall current sensors are respectively used to the electric current gathering closing coil with switching winding, 3 linear displacement transducers Being respectively used to gather A phase, B phase, C phase contact travel, aforementioned currents value and stroke value all send into signal acquisition circuit.

2. a kind of portable high-pressure breaker mechanic property tester as claimed in claim 1, it is characterised in that: described master control Device processed uses TMS320F28335.

3. a kind of portable high-pressure breaker mechanic property tester as claimed in claim 1, it is characterised in that: described signal Acquisition Circuit uses 16 high-precision AD 7606 sampling A/D chip.

4. a kind of portable high-pressure breaker mechanic property tester as claimed in claim 1, it is characterised in that: described optocoupler Circuit includes diode, the first optocoupler and pull-up resistor, and the anode of diode connects A phase, B phase or C phase fracture signal, diode Negative electrode connect the first input end of the first optocoupler, the second input of the first optocoupler connects the anode of diode, the first optocoupler The first outfan connect power supply via pull-up resistor, the first outfan of the first optocoupler is also connected with master controller, the first optocoupler The second output head grounding.

5. a kind of portable high-pressure breaker mechanic property tester as claimed in claim 4, it is characterised in that: described optocoupler Circuit also includes current-limiting resistance, and current-limiting resistance is connected between A phase, B phase or C phase fracture signal and the anode of diode.

6. a kind of portable high-pressure breaker mechanic property tester as claimed in claim 1, it is characterised in that: described combined floodgate Control circuit includes the second optocoupler, voltage follower and solid-state relay, the first input end connection power supply of the second optocoupler, second Input connects master controller, and the first outfan of the second optocoupler connects power supply, and the second outfan connects the negative of voltage follower Input, the positive input terminal of voltage follower connects outfan, and the outfan of voltage follower is also connected with solid-state relay Positive input terminal, the negative input end ground connection of solid-state relay, the outfan of solid-state relay connects closing coil.

7. a kind of portable high-pressure breaker mechanic property tester as claimed in claim 1, it is characterised in that: described SD card Module uses the SD card of Jin Shidun 4GB.

8. a kind of portable high-pressure breaker mechanic property tester as claimed in claim 7, it is characterised in that: described master control SPI communication pattern is used between device processed and SD card module.

9. portable high-pressure breaker mechanic property tester as claimed in claim 1 a kind of, it is characterised in that: described in real time Clock module uses DS1302 clock chip.

10. a kind of portable high-pressure breaker mechanic property tester as claimed in claim 9, it is characterised in that: described master SPI communication pattern is used between controller and real-time clock module.