Intelligent electroscope

Abstract

The utility model discloses an intelligent electroscope comprising a single-chip microcomputer, the single-chip microcomputer is respectively connected with a signal receiving circuit, a high voltage generating circuit, a live-line indicating circuit and a signal generating circuit, and the signal receiving circuit and the signal generating circuit are respectively connected with two spaced live-line indicators. The high-voltage generating circuit and the electrification indicating circuit are both electrically connected with the electrification indicator, and the electrification indicator is connected with the high-voltage sensor. In view of loopholes and problems of high-voltage switch cabinet live-line indication in current operation and maintenance work, the high-voltage switch cabinet live-line indication device is used for detecting problems of live-line indicator damage, high-voltage sensor damage, live-line indication loop open circuit and the like, and the safety of operation and maintenance work of the high-voltage switch cabinet is improved.

Description

Technical Field

[0001] The utility model relates to the field of electricity use safety, and particularly relates to an intelligent electrical detector. Background Art

[0002] Operation and maintenance personnel and maintenance personnel are two major high-risk groups in power companies, and electric shock casualties are a large proportion of power operation safety accidents. The live indication of switch cabinets gives an important reminder to operation and maintenance personnel and maintenance personnel. However, the actual situation is that there are problems such as damage to high-voltage live display devices, damage to high-voltage sensors, and open circuits in live indication circuits, making it uncertain whether the bus is live, increasing the work burden of operation and maintenance personnel and maintenance personnel.

[0003] There are mainly the following three problems with the live indication of high-voltage switch cabinets:

[0004] First, the high-voltage live display device is damaged. Since the live display device is an electronic circuit, especially with LED lights, these are very easily damaged by electrostatic interference;

[0005] Second, the high-voltage sensor is damaged. Its essence is a high-voltage capacitor;

[0006] Third, the live indication circuit is open;

[0007] The above situations will all cause the live indicator not to flash. Therefore, it is urgent to develop an intelligent electrical detector to assist in detecting whether the high-voltage sensor and live indicator in the high-voltage switch cabinet are normal. Content of the Utility Model

[0008] In view of the above deficiencies of the prior art, the utility model provides an intelligent electrical detector to solve the above problems of the prior art.

[0009] To achieve the above invention purpose, the technical solution adopted by the utility model is as follows:

[0010] Provide an intelligent electrical detector, which includes a single-chip microcomputer. The single-chip microcomputer is respectively connected to a signal receiving circuit, a high-voltage generating circuit, a live indication circuit, and a signal generating circuit. The signal receiving circuit and the signal generating circuit are respectively connected to two spaced live indicators. The high-voltage generating circuit and the live indication circuit are both electrically connected to the live indicator, and the live indicator is connected to the high-voltage sensor.

[0011] Further, the signal generation circuit includes an operational amplifier B. The positive input terminal of the operational amplifier B is connected to the single-chip microcomputer through a second-order low-pass filter. The negative input terminal of the operational amplifier B is grounded through a resistor R19 and a capacitor C18. The output terminal of the operational amplifier B is connected to a capacitor C15 through a resistor R15. The capacitor C15 is connected to the live indicator through a terminal block P3. A resistor R17 is provided between the positive and negative poles of the terminal block P3. A resistor R16 and a diode D7 are sequentially connected between the resistor R15 and the capacitor C15, and both the resistor R16 and the diode D7 are connected to the negative pole of the terminal block P3.

[0012] Further, the second-order low-pass filter includes a resistor R14 connected to the single-chip microcomputer. The resistor R14 is connected to the positive input terminal of the operational amplifier B through a resistor R13. A capacitor C16 is connected between the resistor R14 and the resistor R13, and the capacitor C16 is grounded. A capacitor C17 is connected between the resistor R13 and the positive input terminal of the operational amplifier B, and the capacitor C17 is grounded.

[0013] Further, the signal receiving circuit includes an operational amplifier A and an operational amplifier C. The positive input terminal of the operational amplifier A is connected to the terminal block P2 through a band-pass filter. A diode D8 is connected between the band-pass filter and the terminal block P2, and the diode D8 is in parallel with a resistor R8. A resistor R4 and a resistor R5 are connected between the band-pass filter and the operational amplifier A;

[0014] The negative input terminal of the operational amplifier A is sequentially connected to a resistor R11 and a capacitor C10, and the capacitor C10 is grounded. The output terminal of the operational amplifier A is connected to the negative input terminal of the operational amplifier C through a resistor R7. A capacitor C9 and a resistor R10 are sequentially connected in parallel between the resistor R7 and the operational amplifier C, and both the capacitor C9 and the resistor R10 are grounded. A variable resistor R12 is connected in parallel between the output terminal and the negative input terminal of the operational amplifier A; The positive input terminal of the operational amplifier C is connected to a resistor R1 and a resistor R2, the output terminal of the operational amplifier C is connected to the single-chip microcomputer, the terminal block P2 is connected to the live indicator, and a resistor R3 is connected in parallel between the output terminal and the positive input terminal of the operational amplifier C.

[0015] Further, the band-pass filter includes a capacitor C6, a resistor R6, a capacitor C5, and a capacitor C7 connected in sequence. The capacitor C7 is connected to the positive input terminal of the operational amplifier A, the capacitor C6 is connected to the terminal block P2, a capacitor C8 is connected between the resistor R6 and the capacitor C6, a resistor R9 is connected between the capacitor C5 and the capacitor C7, and both the resistor R9 and the capacitor C8 are grounded.

[0016] Further, the live indication circuit includes a terminal P4 connected to the live indicator, the terminal P4 is connected to a rectifier D6, the rectifier D6 is connected to an optocoupler G2, the optocoupler G2 is respectively connected to a triode Q1 and a buzzer LS1; a light-emitting diode LED4 and a light-emitting diode LED5 are connected in parallel on the buzzer LS1;

[0017] It further includes a self-check terminal J2 and a self-check terminal J3, the self-check terminal J2 is connected to the triode Q1, and the self-check terminal J3 is connected to the buzzer LS1 and the optocoupler G2.

[0018] Further, the high-voltage generation circuit includes an optocoupler G1 connected to the single-chip microcomputer, the optocoupler G1 is connected to the primary side of a transformer T3, and diodes D1, D2, D4 and D3 are connected in parallel in sequence on the secondary side of the transformer T3;

[0019] It further includes a terminal P5, one end of the terminal P5 is connected between the diode D1 and the secondary side of the transformer T3, the other end is connected between the diodes D4 and D3, and the terminal P5 is connected to the live indicator.

[0020] The beneficial effects of the present utility model are as follows: In view of the loopholes and problems existing in the live indication of high-voltage switch cabinets in current operation and maintenance work, the present utility model is used to detect problems such as damage to the live indicator, damage to the high-voltage sensor, and open circuit of the live indication loop, so as to improve the safety of the operation and maintenance and repair work of high-voltage switch cabinets. Description of the Drawings

[0021] Figure 1 It is the system schematic diagram of the intelligent electrical detector.

[0022] Figure 2 It is the circuit diagram of the high-voltage generation circuit.

[0023] Figure 3 It is the circuit diagram of the live indication circuit.

[0024] Figure 4 It is the circuit diagram of the signal receiving circuit.

[0025] Figure 5 It is the circuit diagram of the signal generation circuit. Specific Embodiments

[0026] The specific embodiments of the present utility model will be described below to facilitate those skilled in the art of the present technology to understand the present utility model. However, it should be clear that the present utility model is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present utility model defined and determined by the appended claims, these changes are obvious, and all utility models created using the concept of the present utility model are within the scope of protection.

[0027] As Figure 1 shown, an intelligent electroscope includes a single-chip microcomputer, which is respectively connected to a signal receiving circuit, a high-voltage generating circuit, a live indication circuit and a signal generating circuit. The signal receiving circuit and the signal generating circuit are respectively connected to two spaced live indicators. The high-voltage generating circuit and the live indication circuit are both electrically connected to the live indicator, and the live indicator is connected to a high-voltage sensor.

[0028] The single-chip microcomputer uses an STM32F103R8 chip to generate two PWM waveforms, one for the 100V high-voltage generating circuit and one for the live indication circuit.

[0029] In view of the loopholes and problems existing in the live indication of high-voltage switch cabinets in current operation and maintenance work, the utility model is used to detect problems such as damage to the live indicator, damage to the high-voltage sensor, and open circuit in the live indication loop, so as to improve the safety of the operation and maintenance and repair work of high-voltage switch cabinets.

[0030] The signal receiving circuit and the signal generating circuit are used to detect whether the loop between the high-voltage bus and the high-voltage sensor and between the high-voltage sensor and the live indicator is open or whether the high-voltage sensor is damaged.

[0031] As Figure 5 shown, the signal generating circuit includes an operational amplifier B. The positive input terminal of the operational amplifier B is connected to the single-chip microcomputer through a second-order low-pass filter. The negative input terminal of the operational amplifier B is grounded through a resistor R19 and a capacitor C18. The output terminal of the operational amplifier B is connected to a capacitor C15 through a resistor R15. The capacitor C15 is connected to the live indicator through a terminal block P3. A resistor R17 is provided between the positive and negative poles of the terminal block P3. A resistor R16 and a diode D7 are sequentially connected between the resistor R15 and the capacitor C15, and both the resistor R16 and the diode D7 are connected to the negative pole of the terminal block P3.

[0032] The second-order low-pass filter includes a resistor R14 connected to the single-chip microcomputer. The resistor R14 is connected to the positive input terminal of the operational amplifier B through a resistor R13. A capacitor C16 is connected between the resistor R14 and the resistor R13, and the capacitor C16 is grounded. A capacitor C17 is connected between the resistor R13 and the positive input terminal of the operational amplifier B, and the capacitor C17 is grounded.

[0033] For the signal generating circuit, the single-chip microcomputer forms a PWM square wave (50KHz) with a duty cycle of 50%. The rectangular square wave signal PWM passes through a second-order low-pass filter composed of a resistor R14, a capacitor C16, a resistor R13, and a capacitor C17 to form a sine wave, and then is amplified by a voltage follower composed of an operational amplifier B (LMV358 operational amplifier) to enhance its driving ability.

[0034] As Figure 4 shown, the signal receiving circuit includes operational amplifier A and operational amplifier C. The positive input terminal of operational amplifier A is connected to terminal P2 through a band-pass filter. A diode D8 is connected between the band-pass filter and terminal P2. Diode D8 is in parallel with resistor R8. Resistors R4 and R5 are connected between the band-pass filter and operational amplifier A.

[0035] The negative input terminal of operational amplifier A is sequentially connected to resistor R11 and capacitor C10. Capacitor C10 is grounded. The output terminal of operational amplifier A is connected to the negative input terminal of operational amplifier C through resistor R7. Capacitor C9 and resistor R10 are sequentially in parallel between resistor R7 and operational amplifier C. Both capacitor C9 and resistor R10 are grounded. A variable resistor R12 is in parallel between the output terminal and the negative input terminal of operational amplifier A; The positive input terminal of operational amplifier C is connected to resistors R1 and R2. The output terminal of operational amplifier C is connected to the single-chip microcomputer. Terminal P2 is connected to the live indicator. A resistor R3 is in parallel between the output terminal and the positive input terminal of operational amplifier C.

[0036] The band-pass filter includes capacitors C6, R6, C5, and C7 connected in sequence. Capacitor C7 is connected to the positive input terminal of operational amplifier A. Capacitor C6 is connected to terminal P2. A capacitor C8 is connected between resistor R6 and capacitor C6. A resistor R9 is connected between capacitor C5 and capacitor C7. Both resistor R9 and capacitor C8 are grounded.

[0037] For the signal receiving circuit, the weak sine wave electrical signal received by terminal P2 is filtered by the band-pass filter composed of resistor R6, capacitor C8, capacitor C5, and resistor R9, amplified and filtered by operational amplifier A (LMV358), and shaped into a PWM square wave, which enters the single-chip microcomputer. The square wave is counted to determine whether the square wave frequency is 50KHz, so as to know whether the entire circuit for detecting live wire is unobstructed.

[0038] During use, connect the 1st pin of terminal P3 to one of the A, B, and C phases of a spaced live indicator, and the 2nd pin to ground. Connect the 2nd pin of terminal P2 to the corresponding phase of another spaced live indicator. If the high-voltage live indication circuits of the two spaces are not open and the high-voltage sensor is not damaged, the single-chip microcomputer will light up the corresponding indicator light at this time, indicating that this circuit is good.

[0039] As Figure 3 shown, the live indication circuit includes terminal P4 connected to the live indicator. Terminal P4 is connected to rectifier D6. Rectifier D6 is connected to optocoupler G2. Optocoupler G2 is respectively connected to triode Q1 and buzzer LS1. Light-emitting diodes LED4 and LED5 are in parallel on buzzer LS1.

[0040] It also includes a self-check terminal J2 and a self-check terminal J3. The self-check terminal J2 is connected to the triode Q1, and the self-check terminal J3 is connected to the buzzer LS1 and the optocoupler G2.

[0041] The live indication circuit is used to verify whether the high-voltage bus is live. The 1st pin of the terminal block P4 is connected to the phase-check hole of the live indicator, and the 2nd pin is grounded. If the high-voltage bus is live, the low-voltage alternating current induced from the bus is rectified by the rectifier D6, making the optocoupler G2 conduct, and at the same time the triode Q1 also conducts, so that the buzzer LS1, the light-emitting diodes LED4 and LED5 have current passing through. The buzzer LS1 emits sound, and the light-emitting diodes LED4 and LED5 light up. On the contrary, if the bus is not live, the buzzer LS1 does not sound, and the light-emitting diodes LED4 and LED5 do not light up. To ensure the reliability of the operation of this circuit, two self-check terminals J2 and J3 are provided. Insert the 1st pin and the 2nd pin of the terminal block P4 into the self-check holes respectively. At this time, if the circuit is normal, the buzzer LS1 will emit sound, and the light-emitting diodes LED4 and LED5 will light up.

[0042] Such as Figure 2 As shown, the high-voltage generation circuit includes an optocoupler G1 connected to the single-chip microcomputer. The optocoupler G1 is connected to the primary side of the transformer T3. The secondary side of the transformer T3 is connected in parallel with a diode D1, a diode D2, a diode D4 and a diode D3 in sequence.

[0043] It also includes a terminal block P5. One end of the terminal block P5 is connected between the diode D1 and the secondary side of the transformer T3, and the other end is connected between the diode D4 and the diode D3. The terminal block P5 is connected to the live indicator.

[0044] The single-chip microcomputer drives the transformer T3 through the optocoupler G1. The single-chip microcomputer emits rectangular pulses to make the triode in the optocoupler G1 (TLP127) conduct and cut off. When the triode in the optocoupler G1 conducts, there is current flowing through the primary side of the transformer T3. At this time, a voltage of the same phase is generated on the secondary side. When the primary side cuts off, a reverse voltage is generated on the secondary side. In this way, a sine wave is generated on the secondary side. The turns ratio of the transformer is 1:3. Then, through the voltage-doubling circuit composed of diodes and capacitors, a high voltage of about 100V is generated. Connect the 2nd pin of the terminal block P5 to the ground, and the 1st pin to the phase-check hole of the live indicator. If the live indicator is in good condition, the light of the indicator will flash; otherwise, it will not light up. This circuit is used to test the quality of the live indicator.

Claims

1. An intelligent electroscope, characterized in that: It includes a single-chip microcomputer, which is respectively connected to a signal receiving circuit, a high-voltage generating circuit, a charged indication circuit and a signal generating circuit, and the signal receiving circuit and the signal generating circuit are respectively connected to two spaced charged indicators, the high-voltage generating circuit and the charged indication circuit are both electrically connected to the charged indicator, and the charged indicator is connected to a high-voltage sensor.

2. The intelligent electroscope according to claim 1, characterized in that: The signal generating circuit includes an operational amplifier B, a positive input terminal of the operational amplifier B is connected to the single-chip microcomputer through a second-order low-pass filter, a negative input terminal of the operational amplifier B is grounded through a resistor R19 and a capacitor C18, an output terminal of the operational amplifier B is connected to a capacitor C15 through a resistor R15, and the capacitor C15 is connected to a charged indicator through a terminal P3, a resistor R17 is arranged between the positive and negative electrodes of the terminal P3, a resistor R16 and a diode D7 are connected between the resistor R15 and the capacitor C15 in sequence, and the resistor R16 and the diode D7 are both connected to the negative electrode of the terminal P3.

3. The intelligent electroscope according to claim 2, characterized in that: The second-order low-pass filter includes a resistor R14 connected to the single-chip microcomputer, the resistor R14 is connected to the positive input terminal of the operational amplifier B through the resistor R13, a capacitor C16 is connected between the resistor R14 and the resistor R13, the capacitor C16 is grounded, and a capacitor C17 is connected between the resistor R13 and the positive input terminal of the operational amplifier B, the capacitor C17 is grounded.

4. The intelligent electroscope according to claim 1, characterized in that: The signal receiving circuit includes an operational amplifier A and an operational amplifier C, wherein the positive input terminal of the operational amplifier A is connected to the wiring terminal P2 through a bandpass filter, a diode D8 is connected between the bandpass filter and the wiring terminal P2, the diode D8 is connected in parallel with a resistor R8, and resistors R4 and R5 are connected between the bandpass filter and the operational amplifier A; The negative input terminal of the operational amplifier A is connected to the resistor R11 and the capacitor C10 in sequence, and the capacitor C10 is grounded. The output terminal of the operational amplifier A is connected to the negative input terminal of the operational amplifier C through the resistor R7. The capacitor C9 and the resistor R10 are connected in parallel between the resistor R7 and the operational amplifier C in sequence, and the capacitor C9 and the resistor R10 are both grounded. A variable resistor R12 is connected in parallel between the output terminal and the negative input terminal of the operational amplifier A; the positive input terminal of the operational amplifier C is connected to the resistor R1 and the resistor R2, the output terminal of the operational amplifier C is connected to the single-chip microcomputer, the wiring terminal P2 is connected to the charged indicator, and the output terminal and the positive input terminal of the operational amplifier C are connected in parallel with the resistor R3.

5. The intelligent electroscope according to claim 4, characterized in that: The bandpass filter includes a capacitor C6, a resistor R6, a capacitor C5 and a capacitor C7 connected in sequence, the capacitor C7 is connected to the positive input terminal of the operational amplifier A, the capacitor C6 is connected to the wiring terminal P2, a capacitor C8 is connected between the resistor R6 and the capacitor C6, a resistor R9 is connected between the capacitor C5 and the capacitor C7, and the resistor R9 and the capacitor C8 are both grounded.

6. The intelligent electroscope according to claim 1, characterized in that: The charged indicator circuit includes a connection terminal P4 connected to the charged indicator, the connection terminal P4 is connected to the rectifier D6, the rectifier D6 is connected to the optical coupler G2, the optical coupler G2 is connected to the transistor Q1 and the buzzer LS1 respectively, and the buzzer LS1 is connected in parallel with the light emitting diode LED4 and the light emitting diode LED5; The device further comprises a self-test terminal J2 and a self-test terminal J3 , wherein the self-test terminal J2 is connected to the transistor Q1 , and the self-test terminal J3 is connected to the buzzer LS1 and the optical coupler G2 .

7. The intelligent electroscope according to claim 1, characterized in that: The high voltage generating circuit includes an optical coupler G1 connected to the single chip microcomputer, the optical coupler G1 is connected to the primary side of the transformer T3, and the secondary side of the transformer T3 is sequentially connected in parallel with a diode D1, a diode D2, a diode D4 and a diode D3; It also includes a connection terminal P5, one end of which is connected between the diode D1 and the secondary side of the transformer T3, and the other end of which is connected between the diode D4 and the diode D3. The connection terminal P5 is connected to a power indicator.

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