CN206696333U - A kind of Capacitive current tester - Google Patents

Abstract

It the utility model is related to a kind of Capacitive current tester,Tester mainly includes guidance panel,Measuring circuit and power circuit,Tester controls measuring circuit by guidance panel,Power circuit provides stabilized power source input for tester,Guidance panel includes LCD screen earth terminal,Printer,LCDs,Signal output terminal,SR,Measure output switch,Power switch and attaching plug,The LCD screen earth terminal is arranged on the upper left corner of guidance panel,The printer is arranged on the left side of guidance panel,The LCDs is arranged on the middle seat of guidance panel,The signal output terminal is arranged on guidance panel right hand top,The SR and measurement output switch are disposed side by side on signal output terminal bottom,The power switch and attaching plug are disposed side by side on guidance panel bottom right side,Securely and reliably,Preferably promote the use of.

Description

A kind of Capacitive current tester

Technical field

It the utility model is related to circuitry field, more particularly to a kind of Capacitive current tester.

Background technology

At present, the mains neutral point of China's distribution system is not directly grounded usually, so when circuit single-phase earthing The electric current for flowing through trouble point is really capacitance current caused by line mutual-ground capacitor.According to statistics, the failure of power distribution network is largely Capacitance current is excessive when being due to circuit single-phase earthing causes the starting the arc and electric arc can not be voluntarily caused by blow-out.Therefore, China Electric power code is provided when 10kV and 35kV system capacitive currents are respectively greater than 30A and 10A, should install arc suppression coil to compensate electricity Capacitance current, this requires to measure the capacitance current of distribution to make a decision.In addition, the direct-to-ground capacitance of power distribution network and PT ginseng Number produces PT ferro-resonance over-voltages with credit unions, in order to verify whether the distribution system can occur PT resonance and what property occurs Resonance, it is also necessary to the direct-to-ground capacitance value of accurate measurement power distribution network.

The method of traditional measurement distribution network capacitance current test has direct method, the additional electric capacity indirect method of measurement that Single Phase Metal is grounded Primary equipment will be touched Deng, these methods, thus has that experiment is dangerous, trivial operations, the shortcomings such as operating efficiency is low.

Utility model content

The purpose of this utility model is to provide a kind of Capacitive current tester, using following technical scheme：

A kind of Capacitive current tester, tester mainly include guidance panel, measuring circuit and power circuit, and tester leads to Guidance panel control measuring circuit is crossed, power circuit provides stabilized power source input for tester；The guidance panel includes liquid crystal Screen earth terminal, printer, LCDs, signal output terminal, SR, measurement output switch, power switch and electricity Source plug, the LCD screen earth terminal are arranged on the upper left corner of guidance panel, and the printer is arranged on a left side for guidance panel Side, the LCDs are arranged on the middle seat of guidance panel, and the signal output terminal is arranged on the right side of guidance panel Top, the SR and measurement output switch are disposed side by side on signal output terminal bottom, the power switch and power supply Plug is disposed side by side on guidance panel bottom right side.

On the basis of above-mentioned technical proposal, power positive cathode connects battery plus-negative plate in the measuring circuit, and anode connects K1a is switched, switch K1a meets button S through resistance R1, and button S connects GND, and resistance R1 connects NAND gate through NAND gate IC2a IC2b, resistance R1 meet NAND gate IC2b through resistance R2, and resistance R2 connects GND through electric capacity C1, and NAND gate IC2b meets chip IC 1a 6 ports, switch K1a meets switch K2a, switchs K2a three ports and through resistance R3, resistance R4 and resistance R5 while connects electricity respectively Hold CX, electric capacity CX connects GND, and switch K2a connects chip IC 1a 1 and 2 port simultaneously, and chip IC 1a 4 ports connect core Piece IC1a 14 ports, chip IC 1a 14 ports connect battery E negative poles through electric capacity C5, and electric capacity C5 connects chip IC 1a 7 ports, Chip IC 1a 5 ports meet NAND gate IC2c, and NAND gate IC2c connects chip IC 3a 7 ports and chip IC 3b 15 ends respectively Mouthful, while NAND gate IC2c connects 8 ports of chip IC 4 and 8 ports of chip IC 5 respectively, switch K1a is through switching K2b connecting resistances R7, switch K1a meet slide rheostat RP1 through resistance R6, and slide rheostat RP1 connecting resistance R7, resistance R7 connect slide rheostat RP2, slide rheostat RP2 connect chip IC 1b 13 ports, while slide rheostat RP2 connects chip IC 1b 12 ends through resistance R8 Mouthful, slide rheostat RP2 connects battery E negative pole through electric capacity C2, and chip IC 1b 8 ports meet switch K1b, and switch K1b is passed through respectively Electric capacity C3 and electric capacity C4 connects battery E negative pole, and chip IC 1b 9 ports connect chip IC 3a 1 port chip IC3a 14 ports Chip IC 3b 10 ports are connect, chip IC 3a 16 ports and 2 ports connect switch K1a, chip IC 3a 14 ports, 13 ends simultaneously Mouth, 12 ports and 11 ports connect 6 ports, 2 ports, 1 port and 7 ports of chip IC 4,14 ports, 15 ends of chip IC 4 respectively Mouth, 9 ports, 10 ports, 11 ports, 12 ports and 13 ports meet LED1 through resistance respectively, and LED1 connects battery E negative pole, chip IC3b 8 ports and 9 ports meet switch K1a through electric capacity C6, and chip IC 3b 8 ports and 9 ports connect battery E negative pole, chip IC3b 6 ports, 5 ports, 4 ports and 3 ports connect 6 ports, 2 ports, 1 port and 7 ports of chip IC 5, chip IC 5 respectively 14 ports, 15 ports, 9 ports, 10 ports, 11 ports, 12 ports and 13 ports meet LED2 through resistance respectively, LED2 connects battery E negative pole.

On the basis of above-mentioned technical proposal, 220V meets electric capacity C1 through fuse FU in the power circuit, and electric capacity C1 connects change Depressor T input, transformer T output termination rectifier bridge U, rectifier bridge U output termination capacitor C2, electric capacity C2 both ends electricity in parallel Hold C3, the VIN ports of rectifier bridge U output termination chip IC, the GND ports ground connection of chip IC, the VOUT ports warp of chip IC Electric capacity C4 is grounded, electric capacity C4 both ends parallel resistance R1, and the VOUT ports of chip IC meet output head anode, Simultaneous Switching K through switching K Output negative pole is connect through battery E.

The utility model can accurate measurement transmission line of electricity testing capacitance, so as to calculate capacitance current, in capacitance measuring tester Digital frequency conversion inverter is put, with output frequency is accurate, output current is adjustable, delivery efficiency is high, caloric value is small, volume It is small, in light weight, be convenient for carrying use, be provided simultaneously with output short circuit protection function, possess multiple zero sequence overvoltage crowbar, test Instrument output end can tolerate AC100V 50HZ voltages without damaging.

Brief description of the drawings

Fig. 1 is the structural representation of guidance panel.

Fig. 2 is measuring circuit figure.

Fig. 3 is power circuit diagram.

Fig. 4 is measuring principle figure.

Fig. 5 is simplified model figure.

In figure：1- LCD screen earth terminal 2- printer 3- LCDs 4- signal output terminal 5- SRs 6- measures output switch 7- power switch 8- attaching plugs.

Embodiment

The utility model is further elaborated with specific embodiment below in conjunction with the accompanying drawings.

A kind of Capacitive current tester, tester mainly include guidance panel, measuring circuit and power circuit, and tester leads to Guidance panel control measuring circuit is crossed, power circuit provides stabilized power source input for tester；The guidance panel includes liquid crystal Screen earth terminal 1, printer 2, LCDs 3, signal output terminal 4, SR 5, measurement output switch 6, power supply are opened 7 and attaching plug 8 are closed, the LCD screen earth terminal 1 is arranged on the upper left corner of guidance panel, and the printer 2 is arranged on behaviour Make the left side of panel, the LCDs 3 is arranged on the middle seat of guidance panel, and the signal output terminal 4 is arranged on Guidance panel right hand top, the SR 5 and measurement output switch 6 are disposed side by side on signal output terminal bottom, described Power switch 7 and attaching plug 8 are disposed side by side on guidance panel bottom right side.

Power positive cathode connects battery plus-negative plate in the measuring circuit, and anode meets switch K1a, and switch K1a is through resistance R1 meets button S, and button S connects GND, and resistance R1 meets NAND gate IC2b through NAND gate IC2a, resistance R1 through resistance R2 connect with it is non- Door IC2b, resistance R2 connect GND through electric capacity C1, and NAND gate IC2b connects chip IC 1a 6 ports, and switch K1a meets switch K2a, Three ports for switching K2a meet electric capacity CX simultaneously through resistance R3, resistance R4 and resistance R5 respectively, and electric capacity CX connects GND, opened The 1 and 2 port that K2a meets chip IC 1a simultaneously is closed, chip IC 1a 4 ports meet chip IC 1a 14 ports, chip IC 1a 14 ports connect battery E negative poles through electric capacity C5, electric capacity C5 connects chip IC 1a 7 ports, and chip IC 1a 5 ports connect NAND gate IC2c, NAND gate IC2c connect chip IC 3a 7 ports and chip IC 3b 15 ports respectively, while NAND gate IC2c connects core respectively Piece IC4 8 ports and 8 ports of chip IC 5, switch K1a connect slip through resistance R6 and become through switching K2b connecting resistance R7, switch K1a Device RP1 is hindered, slide rheostat RP1 connecting resistance R7, resistance R7 meet slide rheostat RP2, and slide rheostat RP2 connects chip IC 1b's 13 ports, while slide rheostat RP2 connects chip IC 1b 12 ports through resistance R8, slide rheostat RP2 connects electricity through electric capacity C2 Pond E negative pole, chip IC 1b 8 ports meet switch K1b, and switch K1b connects battery E negative pole through electric capacity C3 and electric capacity C4 respectively, 14 ports that chip IC 1b 9 ports meet chip IC 3a 1 port chip IC3a connect chip IC 3b 10 ports, chip IC 3a's 16 ports and 2 ports meet switch K1a simultaneously, and chip IC 3a 14 ports, 13 ports, 12 ports and 11 ports connect chip respectively IC4 6 ports, 2 ports, 1 port and 7 ports, 14 ports, 15 ports, 9 ports, 10 ports, 11 ports, 12 ends of chip IC 4 Mouth and 13 ports meet LED1 through resistance respectively, and LED1 connects battery E negative pole, and chip IC 3b 8 ports and 9 ports connect through electric capacity C6 K1a is switched, chip IC 3b 8 ports and 9 ports connect battery E negative pole, chip IC 3b 6 ports, 5 ports, 4 ports and 3 ends Mouth connects 6 ports, 2 ports, 1 port and 7 ports of chip IC 5,14 ports, 15 ports, 9 ports, 10 ends of chip IC 5 respectively Mouth, 11 ports, 12 ports and 13 ports meet LED2 through resistance respectively, and LED2 connects battery E negative pole.

220V meets electric capacity C1 through fuse FU in the power circuit, and electric capacity C1 meets transformer T input, transformer T Output termination rectifier bridge U, rectifier bridge U output termination capacitor C2, electric capacity C2 both ends shunt capacitance C3, rectifier bridge U output end The VIN ports of chip IC, the GND ports ground connection of chip IC are connect, the VOUT ports of chip IC are grounded through electric capacity C4, electric capacity C4 both ends Parallel resistance R1, the VOUT ports of chip IC connect output head anode through switching K, and Simultaneous Switching K connects output negative pole through battery E.

The Capacitive current tester of the utility model design, can be accurately to be measured in safe measurement transmission line of electricity, With reference to measuring principle figure, injected at bis- open deltas of PT different frequency current signal (the non-50Hz of frequency, in order to Eliminate the interference of power frequency component), in PT high-pressure sides, A, B, C three-phase induction go out 3 sense of current identical current signals, this electric current For zero-sequence current, therefore it can not circulate in power supply and load side, loop can only be formed by PT and direct-to-ground capacitance, with reference to letter Change illustraton of model, three-phase ground capacitance value 3C0 is measured by detecting measurement signal can, further according to formula I=3 ω COU φ (U φ are the phase voltage of system under test (SUT)) calculates the capacitance current of distribution network systems.

Described above is the utility model preferred embodiment, for the ordinary skill in the art, according to this reality With new teaching, in the case where not departing from principle of the present utility model and spirit, the change that is carried out to embodiment, repair Change, replace and modification is still fallen within the scope of protection of the utility model.

Claims (3)

1. a kind of Capacitive current tester, it is characterised in that tester mainly includes guidance panel, measuring circuit and power supply electricity Road, tester control measuring circuit by guidance panel, and power circuit provides stabilized power source input for tester；The operating surface Plate include LCD screen earth terminal (1), printer (2), LCDs (3), signal output terminal (4), SR (5), Measurement output switch (6), power switch (7) and attaching plug (8), the LCD screen earth terminal (1) are arranged on guidance panel The upper left corner, the printer (2) is arranged on the left side of guidance panel, and the LCDs (3) is arranged on guidance panel Middle seat, the signal output terminal (4) are arranged on guidance panel right hand top, the SR (5) and measurement output Switch (6) is disposed side by side on signal output terminal bottom, and the power switch (7) and attaching plug (8) are disposed side by side on operation Panel bottom right side.

2. a kind of Capacitive current tester according to claim 1, it is characterised in that power supply is positive and negative in the measuring circuit Pole connects battery plus-negative plate, and anode meets switch K1a, and switch K1a meets button S through resistance R1, and button S connects GND, resistance R1 meets NAND gate IC2b through NAND gate IC2a, and resistance R1 meets NAND gate IC2b through resistance R2, and resistance R2 connects battery through electric capacity C1 and born Pole, NAND gate IC2b connect chip IC 1a 6 ports, and switch K1a meets switch K2a, switchs K2a three ports respectively through resistance R3, resistance R4 and resistance R5 meet electric capacity CX simultaneously, and electric capacity CX connects GND, switch K2a connect simultaneously chip IC 1a 1 port and 2 ports, chip IC 1a 4 ports connect chip IC 1a 14 ports, and chip IC 1a 14 ports connect battery E negative poles through electric capacity C5, Electric capacity C5 connects chip IC 1a 7 ports, and chip IC 1a 5 ports meet NAND gate IC2c, and NAND gate IC2c connects chip respectively IC3a 7 ports and chip IC 3b 15 ports, at the same NAND gate IC2c connect respectively chip IC 48 ports and chip IC 58 Port, switch K1a meet slide rheostat RP1 through switching K2b connecting resistance R7, switch K1a through resistance R6, and slide rheostat RP1 connects Resistance R7, resistance R7 meet slide rheostat RP2, and slide rheostat RP2 connects chip IC 1b 13 ports, while slide rheostat RP2 connects chip IC 1b 12 ports through resistance R8, and slide rheostat RP2 connects battery E negative pole through electric capacity C2, and the 8 of chip IC 1b Port meets switch K1b, and switch K1b connects battery E negative pole through electric capacity C3 and electric capacity C4 respectively, and chip IC 1b 9 ports connect chip IC3a 1 port chip IC3a 14 ports connect chip IC 3b 10 ports, and chip IC 3a 16 ports and 2 ports connect out simultaneously K1a is closed, chip IC 3a 14 ports, 13 ports, 12 ports and 11 ports connect 6 ports, 2 ports, 1 port of chip IC 4 respectively And 7 ports, 14 ports, 15 ports, 9 ports, 10 ports, 11 ports, 12 ports and 13 ports of chip IC 4 connect through resistance respectively LED1, LED1 connect battery E negative pole, and chip IC 3b 8 ports and 9 ports connect switch K1a, chip IC 3b 8 ends through electric capacity C6 Mouth and 9 ports connect battery E negative pole, and chip IC 3b 6 ports, 5 ports, 4 ports and 3 ports connect 6 ends of chip IC 5 respectively Mouth, 2 ports, 1 port and 7 ports, 14 ports, 15 ports, 9 ports, 10 ports, 11 ports, 12 ports and 13 ends of chip IC 5 Mouth meets LED2 through resistance respectively, and LED2 connects battery E negative pole.

3. a kind of Capacitive current tester according to claim 1, it is characterised in that 220V is through protecting in the power circuit Dangerous silk FU meets electric capacity C1, and electric capacity C1 connects transformer T input, transformer T output termination rectifier bridge U, rectifier bridge U output ends Connect electric capacity C2, the VIN ports of electric capacity C2 both ends shunt capacitance C3, rectifier bridge U output termination chip IC, the GND ends of chip IC Mouth ground connection, the VOUT ports of chip IC are grounded through electric capacity C4, and electric capacity C4 both ends parallel resistance R1, the VOUT ports of chip IC are through opening Close K and connect output head anode, Simultaneous Switching K connects output negative pole through battery E.