Microcomputer protection grounding verification device

Abstract

The utility model relates to a microcomputer protection grounding verification device. The utility model aims to avoid misoperation of an opening-closing coil of power equipment. According to the technical scheme, the device comprises a battery, a double-pole-double-throw switch, a slide rheostat, an ohmmeter and a measurement reality judgment circuit. The double-pole-double-throw switch is connected with the ohmmeter, the ohmmeter is connected with the slide rheostat, the battery supplies power to the ohmmeter and the measurement and judgment circuit, the measurement and judgment circuit is connected with the Hall device H which is connected in series with a working loop, and the Hall device H is connected with the double-pole-double-throw switch.

Description

Technical Field

[0001] The utility model relates to a microcomputer protection grounding verification device. Background Art

[0002] With the upgrading of the national power grid and the continuous optimization of the grid structure, there are a large number of line opening Π, T-connection, relocation and other works. In the field of relay protection, it is necessary to re-align the renamed equipment to ensure that the signals sent to the monitoring personnel are accurate.

[0003] In the traditional alignment process, generally, the signals generated by the device itself are used for alignment, or connecting wires are directly used to cross the nodes for alignment. When using connecting wires for alignment, if the alignment position is incorrect or accidentally touches the operating terminals, it will cause the misoperation of the operating equipment, resulting in serious power grid accidents or equipment damage. Summary of the Invention

[0004] The utility model provides a microcomputer protection grounding verification device to avoid the misoperation of the closing and opening coils of power equipment.

[0005] The technical solution adopted by the utility model is: a microcomputer protection grounding verification device, which includes a battery, a double-pole double-throw switch, a sliding rheostat, an ohmmeter, and a measurement and reality judgment circuit;

[0006] The double-pole double-throw switch is connected to the ohmmeter, the ohmmeter is connected to the sliding rheostat, the battery supplies power to the ohmmeter and the measurement and judgment circuit, the measurement and reality judgment circuit is connected to the Hall device H connected in series in the working circuit, and the Hall device H is connected to the double-pole double-throw switch.

[0007] Further, the measurement and reality judgment circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a potentiometer P1, a potentiometer P2, a capacitor C1, a light-emitting diode GLED, a light-emitting diode RLED, a comparator U1, and a comparator U2; the output pole of the Hall device H is connected in parallel with the resistor R1 and the capacitor C1, and is connected to the 2nd and 1st pins of the comparator U1 and the comparator U2. The 3rd and 4th pins of the comparator U1 are connected to the potentiometer P1, the 3rd and 4th pins of the comparator U2 are connected to the potentiometer P2, the 5th pins of the comparator U1 and the comparator U2 are connected to the power supply, the 4th and 1st pins of the comparator U1 are connected to the power supply ground, the 7th pin of the comparator U1 and the resistor R2 are connected to the positive pole of the light-emitting diode GLED together, the other end of the resistor R2 is connected to the power supply, one end of the resistor R3 is connected to the power supply, and the other end and the 7th pin of the comparator U2 are connected to the connection point of the negative pole of the light-emitting diode GLED and the positive pole of the light-emitting diode RLED together. The negative pole of the light-emitting diode RLED is grounded through the resistor R4 and the 7th pin of the comparator U2 together.

[0008] Advantages of the Utility Model

[0009] 1) The utility model is a device that can prevent the circuit breaker from malfunctioning and ensure the normal transmission of signals.

[0010] 2) The utility model can realize self-detection, ensure the normal connection of the measurement circuit, and accurate resistance.

[0011] 3) Through the display of different colors of the LED lights, the utility model can judge whether the wiring of the circuit is normal. Description of the Drawings

[0012] Figure 1 is the circuit diagram of the utility model.

[0013] Figure 2 is the circuit diagram of the measurement display and judgment circuit of the utility model.

[0014] Reference Numerals: 1, 5V battery; 2, double-pole double-throw switch; 3, sliding rheostat; 4, ohmmeter; 5, alignment position; 6, measurement position; 7, measurement display and judgment circuit. Detailed Embodiment

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0016] The utility model provides a microcomputer protection grounding verification device, including a battery 1, a double-pole double-throw switch 2, a sliding rheostat 3, an ohmmeter 4, and a measurement and reality judgment circuit 7, as Figure 1 shown;

[0017] The double-pole double-throw switch 2 is connected to the ohmmeter 4, the ohmmeter 4 is connected to the sliding rheostat 3, the battery supplies power to the ohmmeter 4 and the measurement judgment circuit 7, the measurement and reality judgment circuit 7 is connected to the Hall device H connected in series in the working circuit, and the Hall device H is connected to the double-pole double-throw switch 2.

[0018] The described measurement reality judgment circuit 7 includes resistor R1, resistor R2, resistor R3, resistor R4, potentiometer P1, potentiometer P2, capacitor C1, light-emitting diode GLED, light-emitting diode RLED, comparator U1, and comparator U2; the output pole of Hall device H is connected in parallel with resistor R1 and capacitor C1, and is connected to pins 2 and 1 of comparator U1 and comparator U2. The 3rd and 4th pins of comparator U1 are connected to potentiometer P1, and the 3rd and 4th pins of comparator U2 are connected to potentiometer P2. The 5th pins of comparator U1 and comparator U2 are connected to the power supply. The 4th and 1st pins of comparator U1 are connected to the power supply ground. The 7th pin of comparator U1 and resistor R2 are connected to the positive pole of light-emitting diode GLED together, and the other end of resistor R2 is connected to the power supply. One end of resistor R3 is connected to the power supply, and the other end and the 7th pin of comparator U2 are connected to the connection point of the negative pole of light-emitting diode GLED and the positive pole of light-emitting diode RLED. The negative pole of light-emitting diode RLED is grounded together with the 7th pin of comparator U2 through resistor R4, as Figure 2 shown.

[0019] Two working states of the present utility model

[0020] I. Measuring its own resistance

[0021] The double-pole double-throw switch 2 is in position 6. The battery 1 supplies power to the ohmmeter 4, and the ohmmeter 4 measures the resistance of the rheostat 3. At this time, adjust the rheostat 3 so that the resistance value is the resistance value required by the device for point-to-point connection.

[0022] At this time, the rheostat has the following two functions:

[0023] 1. According to the investigation of the breaker coil impedance and the input impedance of the microcomputer protection in the principle, the number of samples is limited and cannot represent all the breaker coil impedances and the input impedances of the microcomputer protection on the market. In order for the device to adapt to more devices, a rheostat is used.

[0024] 2. By changing the resistance value of the rheostat, the resistance value change on the ohmmeter can be seen to ensure the normal line and resistance value, and to ensure the normal use of the device.

[0025] II. Point-to-point connection

[0026] The double-pole double-throw switch 2 is in position 5. The battery 1 disconnects the power supply to the ohmmeter 4. Both ends of the rheostat 3 are connected to the point-to-point interface AB to complete the point-to-point connection work. The normal or faulty wiring of the line is judged by detecting the current value, and different color LEDs are used to display normal or faulty.

[0027] The specific working method of the present utility model:

[0028] Step 1: Calculate the resistance value R

[0029] According to the resistance value R1 of the circuit breaker coil and the minimum starting voltage U1 of the circuit breaker at the device usage site, the resistance R2 of the anti-misoperation point device should be: R2 ≥ ((220 - U1) * R1) / U1

[0030] According to the minimum driving current I2 input by the microcomputer protection and the voltage specification U2 at the input end of the microcomputer protection at the device usage site, the R3 to ensure normal transmission of the point signal should be: R3 ≤ U2 / I2

[0031] The resistance R of the device should be between R2 and R3

[0032] R2 ≤ R ≤ R3

[0033] Step 2: Adjust the device resistance

[0034] Toggle the switch 2 of the device so that the switch position is at position 6. At this time, the ohmmeter 3 is powered on, and the device resistance can be adjusted according to the screen display.

[0035] According to Step 1, adjust the sliding rheostat 3 of the device so that the resistance R meets the requirements of Step 1.

[0036] Step 3: Point-to-point

[0037] Toggle the switch 2 of the device so that the switch position is at position 5. At this time, the screen of the ohmmeter 3 is powered off.

[0038] Keep the position of the sliding rheostat unchanged. That is, keep the resistance unchanged.

[0039] Both ends of the resistance are already connected to the test leads AB.

[0040] The point-to-point work can be completed.

[0041] The wire connecting the test lead A passes through the Hall device H and sends the detected DC current signal to the detection circuit 7. There are two sets of comparison circuits in the detection circuit 7. By adjusting the resistance values of P1 and P2, when the current of the Hall device H is between 0 - 0.1 mA, it is considered that there is no current and both the light-emitting diodes GLED and RLED are not lit, indicating that the tested line is not connected; if the current of the Hall device H is between 0.1 - 14 mA, it is considered that the line has not triggered any switch-type line. If the background signal reacts normally, it is considered that the wiring at this point is correct and the light-emitting diode GLED is lit; if the current of the Hall device H is greater than 14 mA, it is considered that the line has triggered a switch-type line, obviously it is a mispointed line or the line wiring is incorrect and the light-emitting diode RLED is lit.

[0042] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A microcomputer protection grounding verification device, characterized in that, It includes a battery (1), a double-pole double-throw switch (2), a sliding rheostat (3), an ohmmeter (4), and a measurement and reality judgment circuit (7); The double-pole double-throw switch (2) is connected to the ohmmeter (4), the ohmmeter (4) is connected to the sliding rheostat (3), the battery (1) supplies power to the ohmmeter (4) and the measurement and judgment circuit (7), the measurement and reality judgment circuit (7) is connected to the Hall device H connected in series in the working circuit, and the Hall device H is connected to the double-pole double-throw switch (2); The measurement and reality judgment circuit (7) includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a potentiometer P1, a potentiometer P2, a capacitor C1, a light-emitting diode GLED, a light-emitting diode RLED, a comparator U1, and a comparator U2; the output pole of the Hall device H is connected in parallel with the resistor R1 and the capacitor C1, and is connected to the 2nd and 1st pins of the comparator U1 and the comparator U2. The 3rd and 4th pins of the comparator U1 are connected to the potentiometer P1, the 3rd and 4th pins of the comparator U2 are connected to the potentiometer P2, the 5th pins of the comparator U1 and the comparator U2 are connected to the power supply, the 4th and 1st pins of the comparator U1 are connected to the power supply ground, the 7th pin of the comparator U1 and the resistor R2 are connected to the positive electrode of the light-emitting diode GLED together, the other end of the resistor R2 is connected to the power supply, one end of the resistor R3 is connected to the power supply, and the other end and the 7th pin of the comparator U2 are connected to the connection point of the negative electrode of the light-emitting diode GLED and the positive electrode of the light-emitting diode RLED together. The negative electrode of the light-emitting diode RLED is grounded together with the 7th pin of the comparator U2 through the resistor R4.

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