CN216649229U - Phase difference type comprehensive protector for coal mine motor - Google Patents
Phase difference type comprehensive protector for coal mine motor Download PDFInfo
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- CN216649229U CN216649229U CN202220189395.4U CN202220189395U CN216649229U CN 216649229 U CN216649229 U CN 216649229U CN 202220189395 U CN202220189395 U CN 202220189395U CN 216649229 U CN216649229 U CN 216649229U
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Abstract
The utility model discloses a phase difference type comprehensive protector for a coal mine motor, belonging to the technical field of coal mine motor comprehensive protection; the technical problem to be solved is as follows: the improvement of the hardware structure of the phase difference type comprehensive protector for the coal mine motor is provided; the technical scheme for solving the technical problems is as follows: the detection system comprises an MCU (microprogrammed control unit) main controller and at least one detection module, wherein each detection module comprises a line voltage detection unit, two line current detection units and two rising edge detection units; the utility model is applied to coal mine motors.
Description
Technical Field
The utility model discloses a phase difference type comprehensive protector for a coal mine motor, and belongs to the technical field of phase difference type comprehensive protectors for coal mine motors.
Background
The mining motor is widely applied to equipment such as a belt conveyer, a reversed loader, a fan and the like in a coal mine. Due to the special underground working condition, electromagnetic starter products have the defects of large occupied area, heavy weight and the like, the electromagnetic starter is particularly obvious on products such as a multi-loop combination switch and the like, one multi-combination electromagnetic starter can realize the centralized control of a plurality of belts, the sequential starting and the reverse-order parking of the plurality of belts are realized, the multi-path combination switch is too large in size and not easy to transport, and the internal detection circuits are multiple, so that the maintenance is not facilitated. Therefore, in order to guarantee the normal operation of the motor, the circuit of the motor needs to be detected regularly, but the underground motor comprehensive protection mostly uses detection three-phase current, and the phase failure is judged according to the magnitude of the current, so that three current transformers and three current transmitters are needed, the comprehensive protection of one motor can be realized, the electromagnetic starter products have the defects of large occupied area, heavy weight and the like, and the detection is particularly obvious on the products such as a multi-way combination switch.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model aims to solve the technical problems that: the improvement of the hardware structure of the phase difference type comprehensive protector for the coal mine motor is provided.
In order to solve the technical problems, the utility model adopts the technical scheme that: a phase difference type comprehensive protector for a coal mine motor comprises an explosion-proof shell, wherein at least one detection interface area is arranged on the explosion-proof shell, the detection interface area comprises a line voltage detection interface and two line current detection interfaces, the line voltage detection interface is connected with the line voltage of a motor main loop after voltage reduction through a transformer through a lead, the two line current detection interfaces are connected with two current transformers, and currents of A, B, C phases of the motor main loop are respectively adopted;
the anti-explosion shell is internally provided with a detection circuit board, the detection circuit board is integrated with an MCU main controller and at least one detection module, each detection module comprises a line voltage detection unit, two line current detection units and two rising edge detection units, the MCU main controller is respectively connected with the line voltage detection unit, the two line current detection units and the output ends of the two rising edge detection units through wires, the input end of the line voltage detection unit is connected with the line voltage of a motor main circuit through a line voltage detection interface, and the input ends of the two line current detection units and the two rising edge detection units are respectively connected with two current transformers through two line current detection interfaces.
The line voltage detection unit converts the voltage after voltage reduction into a 0-5 VDC signal after sequentially passing through a diode rectification circuit, a capacitor filtering circuit and a transmitting circuit and transmits the signal to the MCU main controller.
After the current transformer converts the acquired current into voltage, the line current detection unit converts the converted voltage into a 0-5 VDC signal and sends the signal to the MCU main controller through diode rectification, capacitor filtering and a transmitting circuit in sequence.
The rising edge detection unit carries out zero-crossing comparison on a current signal acquired by the current transformer, converts a sine wave signal into a square wave signal and sends the square wave signal to the MCU main controller.
The line voltage detection interface is connected with the voltage reduction end of the transformer through a lead, the voltage increase end of the transformer is connected with any two phases of the three-phase alternating current A, B, C through leads, and the line voltage between any two phases of the three-phase electricity is collected.
The two lines of line current detection interfaces are respectively connected with current transformers arranged on any two phases of the three-phase alternating current A, B, C through leads.
And the detection circuit board is also provided with an electric leakage protection circuit.
The MCU main controller is also connected with the wireless communication module through a wire.
And the explosion-proof shell is also provided with a liquid crystal display screen, and the liquid crystal display screen is connected with the MCU main controller through a wire.
Compared with the prior art, the utility model has the beneficial effects that: the phase difference type comprehensive protector for the coal mine motor can be applied to various electromagnetic starters, and can realize comprehensive protection of the motor by only detecting one path of voltage and two paths of current. Each motor loop saves 1/3 space and cost compared with the traditional electromagnetic starter, and the internal wiring is simple, and the maintenance is convenient.
Drawings
The utility model is further described below with reference to the accompanying drawings:
fig. 1 is a wiring diagram of a main circuit of a motor provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the internal testing of the novel integrated protector of the present invention;
FIG. 3 is a schematic circuit diagram of a line current detection unit according to the present invention;
FIG. 4 is a schematic circuit diagram of a rising edge detection unit according to the present invention;
FIG. 5 is a phase sequence waveform diagram under normal conditions;
FIG. 6 is a waveform of the phase sequence after a C-phase short circuit;
in the figure: the circuit board comprises an explosion-proof shell 1, a line current detection interface 2, a line voltage detection interface 3, an MCU main controller 4, a line voltage detection unit 5, a line current detection unit 6 and a rising edge detection unit 7, wherein the line voltage detection unit is connected with the MCU main controller, and the rising edge detection unit/8 is connected with the MCU main controller.
Detailed Description
As shown in fig. 1 to 6, the phase difference type comprehensive protector for the coal mine motor of the present invention includes an explosion-proof housing 1, where the explosion-proof housing 1 is provided with at least one detection interface area, the detection interface area includes a line voltage detection interface 3 and two line current detection interfaces 2, where the line voltage detection interface 3 is connected to a line voltage of a motor main loop stepped down by a transformer through a wire, the two line current detection interfaces 2 are connected to two current transformers TA1 and TA2, and the currents of two phases of the motor main loop A, B, C are respectively adopted;
a detection circuit board 8 is arranged inside the explosion-proof shell 1, an MCU main controller 4 and at least one detection module are integrated on the detection circuit board 8, each detection module comprises a line voltage detection unit 5, two line current detection units 6 and two rising edge detection units 7, wherein the MCU main controller 4 is respectively connected with the output ends of the line voltage detection unit 5, the two line current detection units 6 and the two rising edge detection units 7 through leads, the input end of the line voltage detection unit 5 is connected with the line voltage of a motor main loop through a line voltage detection interface 3, and the input ends of the two line current detection units 6 and the two rising edge detection units 7 are respectively connected with two current transformers TA1 and TA2 through two line current detection interfaces 2; the phase difference of the two loop currents is detected by the two-path rising edge detection unit 7.
The line voltage detection unit 5 converts the voltage after voltage reduction into a 0-5 VDC signal after sequentially passing through a diode rectification circuit, a capacitor filtering circuit and a transmitting circuit, and transmits the signal to the MCU main controller 4.
After the current transformer converts the acquired current into voltage, the line current detection unit 6 converts the converted voltage into a 0-5 VDC signal and sends the signal to the MCU main controller 4 through diode rectification, capacitor filtering and a transmitting circuit in sequence.
The rising edge detection unit 7 performs zero-crossing comparison on the current signal acquired by the current transformer, converts the sine wave signal into a square wave signal and sends the square wave signal to the MCU main controller 4.
The line voltage detection interface 3 is connected with the voltage reduction end of the transformer through a lead, the voltage increase end of the transformer is connected with any two phases of the three-phase alternating current A, B, C through leads, and the line voltage between any two phases of the three-phase alternating current is collected.
The two lines of line current detection interfaces 2 are respectively connected with current transformers arranged on any two phases of the three-phase alternating current A, B, C through leads.
And the detection circuit board 8 is also provided with an electric leakage protection circuit.
The MCU main controller 4 is also connected with the wireless communication module through a wire.
And the explosion-proof shell 1 is also provided with a liquid crystal display screen, and the liquid crystal display screen is connected with the MCU main controller 4 through a wire.
The utility model provides a detecting circuit board in a phase difference type integrated protector for a coal mine motor, which is arranged in an explosion-proof shell and meets the safety requirement under a mine, and a main control circuit part of the phase difference type integrated protector for the coal mine motor mainly comprises: a line voltage detection unit 5, two line current detection units 6, two rising edge detection units 7 and the MCU main controller 4. Taking fig. 1 as an example, the present invention detects the line voltages of the B-phase and the C-phase through the transformer TC 1. The current of A phase and C phase is detected by a current transformer, and an isolating reversing switch QS1 is installed at the inlet end of the motor, wherein the A phase and the B phase can switch the phase sequence. Fig. 2 is a schematic diagram of the internal phase difference type integrated protector for the coal mine motor, wherein:
and the line voltage detection unit 5 converts high voltage into low voltage through a transformer, then carries out comprehensive protection, carries out diode rectification, carries out capacitor filtering, converts a signal into a 0-5 VDC signal through a transmitting circuit, and transmits the signal to the MCU main controller 4. The voltage detection circuit is used for detecting the voltage of a main loop and realizing protection such as overvoltage and undervoltage. The line voltage detecting unit 5 can pick up a line voltage between any two phases.
The two line current detection units 6 convert current into voltage through the current transformer, then enter the comprehensive protector, perform diode rectification, perform capacitance filtering, convert signals into 0-5 VDC signals through the transmitting circuit, and transmit the signals to the MCU main controller 4. The circuit is used for detecting the current of the main circuit and realizing the protection of overload, short circuit and the like. The current transformer of the line current detection unit can collect line currents of any two phases.
And the two rising edge detection units 7 are used for carrying out zero-crossing comparison on current signals acquired by the current transformer, changing sine waves into square waves and transmitting the square waves to the MCU main controller 4 for realizing open-phase protection.
FIG. 3 shows a current transformer input transmitting circuit, which reverses the potential through U1A, then removes the negative half-wave through U1B, converts the waveform into a wave form through U1D, filters the collected alternating current signal through U1C, and obtains the potential signal which can be calculated by the MCU main controller through adjusting the potentiometer.
Fig. 4 shows that after the current transformer is input, the sine wave is adjusted to be a square wave through the zero-crossing comparison circuit, and the square wave is used for the MCU main controller to calculate the phase difference: and after the rising edge of the loop A is detected, starting a timer until the rising edge of the loop C is detected, considering that the sampling is finished, and recording the current phase time.
As optimization, the utility model also increases the leakage protection and enriches the protection function of the product.
As optimization, the utility model also adds an external communication function, realizes remote start and stop, and realizes the purposes of unattended operation and automatic production in the underground coal mine.
As optimization, the utility model also adds a color liquid crystal display screen to more intuitively carry out human-computer interaction.
As optimization, the utility model can also detect more loop current signals simultaneously, which is equivalent to one comprehensive protection and can realize the protection of a plurality of motors.
The main realization method for detecting the motor utilizes the phase sequence characteristic of three-phase power. Whether the phase sequence is normal is detected firstly, and when the phase sequence is normal, the third path of current is calculated according to the principle that the vector sum Ia + Ib + Ic =0 of three-phase power, so that complete protection of phase failure, overload, short circuit and the like can be realized.
The specific implementation method comprises the following steps: according to the real-time data measured by the current transformer, the phase difference of the current of each two loops can be measured by the rising edge detection unit. When the three-phase power normally turns on the motor, the phase difference between each two-phase power is 120 °. According to the electricity frequency 50hz in China, the rising edge of any two-phase electricity is 20 × 1 × 3=6.66ms or 20 × 2/3=13.2ms different. And if the phase sequence difference of the two phases is not in the range of 6.66 +/-1 ms or 13.2 +/-1 ms, judging that the phase is broken.
Further exemplified by the absence of a phase: when three-phase power lacks one phase, two situations are distinguished: a. the phase difference of the two phases can become 180 degrees, namely the two phases which are just not broken are detected, and the phase difference of the two phases is 10ms, so that the two phases are judged to be broken; b. the phase difference of two phases cannot be detected, namely, only one phase of the two phases is detected to have current, and the phase is judged to be open.
If there is no open-phase fault, then a current calculation is performed. And according to real-time data measured by the current transformer, two paths of current signals for the MCU main controller to calculate are obtained through the rectification → filtering → transmitting circuit. And calculating a third path of current according to the principle that the vector sum Ia + Ib + Ic =0 of the three-phase power. The accurate current values of the three loops can be obtained, and compared with the rated current, whether the motor has faults of overcurrent, short circuit and the like is judged.
Fig. 5 shows the phase sequence waveform under normal conditions, where the rising edges of any two phases are different by 120 ° (for example, phase a and phase B) or 240 ° (for example, phase a and phase C), and it can be known that the rising edge of the phase C loop can be detected after 6.66ms or 13.2ms after the rising edge of the phase a loop is detected.
Fig. 6 shows the phase sequence waveform after the phase C is broken, and it can be seen that the rising edges of any two terms are 180 ° apart (e.g., phase a and phase B) or cannot be detected (e.g., phase a and phase C, because phase C has no waveform).
According to real-time line voltage data measured by the transformer, voltage signals for the MCU main controller to calculate are obtained through the rectification → filtering → transmitting circuit, and are compared with rated voltage to judge whether faults such as overvoltage and undervoltage exist in the motor.
As an optimization, because the square wave rectified by the zero-crossing comparator has burrs, fuzzy control is adopted, that is, the times of 120 degrees (6 ms-7 ms) or 240 degrees (13 ms-14 ms) of the rising edges of the two terms in five seconds are detected every five seconds, and if the times are less than 125 times, the phase failure is determined.
The utility model realizes the phase failure, overload, overcurrent and overvoltage protection of the motor with the least space and cost. The cost is low, the motor is not easy to damage, and the motor is widely applicable to various coal mine motors.
It should be noted that, regarding the specific structure of the present invention, the connection relationship between the modules adopted in the present invention is determined and can be realized, except for the specific description in the embodiment, the specific connection relationship can bring the corresponding technical effect, and the technical problem proposed by the present invention is solved on the premise of not depending on the execution of the corresponding software program.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a colliery is phase difference formula comprehensive protector for motor, includes explosion-proof casing, its characterized in that: the explosion-proof shell is provided with at least one detection interface area, the detection interface area comprises a line voltage detection interface and two line current detection interfaces, the line voltage detection interface is connected with the line voltage of the motor main loop after being reduced by the transformer through a lead, the two line current detection interfaces are connected with two current transformers, and the currents of two phases of the motor main loop A, B, C are respectively collected;
the anti-explosion shell is internally provided with a detection circuit board, the detection circuit board is integrated with an MCU main controller and at least one detection module, each detection module comprises a line voltage detection unit, two line current detection units and two rising edge detection units, the MCU main controller is respectively connected with the line voltage detection unit, the two line current detection units and the output ends of the two rising edge detection units through wires, the input end of the line voltage detection unit is connected with the line voltage of a motor main circuit through a line voltage detection interface, and the input ends of the two line current detection units and the two rising edge detection units are respectively connected with two current transformers through two line current detection interfaces.
2. The phase difference type integrated protector for the coal mine motor according to claim 1, which is characterized in that: the line voltage detection unit converts the voltage after voltage reduction into a 0-5 VDC signal after sequentially passing through a diode rectification circuit, a capacitor filtering circuit and a transmitting circuit and transmits the signal to the MCU main controller.
3. The phase difference type integrated protector for the coal mine motor according to claim 1, which is characterized in that: after the current transformer converts the acquired current into voltage, the line current detection unit converts the converted voltage into a 0-5 VDC signal and sends the signal to the MCU main controller through diode rectification, capacitor filtering and a transmitting circuit in sequence.
4. The phase difference type integrated protector for the coal mine motor according to claim 1, which is characterized in that: the rising edge detection unit carries out zero-crossing comparison on a current signal acquired by the current transformer, converts a sine wave signal into a square wave signal and sends the square wave signal to the MCU main controller.
5. The phase difference type integrated protector for the coal mine motor according to claim 1, which is characterized in that: the line voltage detection interface is connected with the voltage reduction end of the transformer through a lead, the voltage increase end of the transformer is connected with any two phases of the three-phase alternating current A, B, C through leads, and the line voltage between any two phases of the three-phase electricity is collected.
6. The phase difference type integrated protector for the coal mine motor according to claim 1, which is characterized in that: the two lines of line current detection interfaces are respectively connected with current transformers arranged on any two phases of the three-phase alternating current A, B, C through leads.
7. The phase difference type integrated protector for the coal mine motor according to claim 1, which is characterized in that: and the detection circuit board is also provided with an electric leakage protection circuit.
8. The phase difference type integrated protector for the coal mine motor according to claim 1, which is characterized in that: the MCU main controller is also connected with the wireless communication module through a wire.
9. The phase difference type integrated protector for the coal mine motor according to claim 1, which is characterized in that: and the explosion-proof shell is also provided with a liquid crystal display screen, and the liquid crystal display screen is connected with the MCU main controller through a wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220189395.4U CN216649229U (en) | 2022-01-24 | 2022-01-24 | Phase difference type comprehensive protector for coal mine motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220189395.4U CN216649229U (en) | 2022-01-24 | 2022-01-24 | Phase difference type comprehensive protector for coal mine motor |
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| CN216649229U true CN216649229U (en) | 2022-05-31 |
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| CN202220189395.4U Active CN216649229U (en) | 2022-01-24 | 2022-01-24 | Phase difference type comprehensive protector for coal mine motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116243043A (en) * | 2023-02-07 | 2023-06-09 | 泰安市众诚自动化软件有限公司 | Explosion-proof type voltage current transformer of motor side |
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2022
- 2022-01-24 CN CN202220189395.4U patent/CN216649229U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116243043A (en) * | 2023-02-07 | 2023-06-09 | 泰安市众诚自动化软件有限公司 | Explosion-proof type voltage current transformer of motor side |
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