CN207851196U - A kind of alternating current-direct current single-phase-to-earth fault analysis instrument and grounding fault positioning system - Google Patents
A kind of alternating current-direct current single-phase-to-earth fault analysis instrument and grounding fault positioning system Download PDFInfo
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- CN207851196U CN207851196U CN201820094514.1U CN201820094514U CN207851196U CN 207851196 U CN207851196 U CN 207851196U CN 201820094514 U CN201820094514 U CN 201820094514U CN 207851196 U CN207851196 U CN 207851196U
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Abstract
The utility model discloses a kind of alternating current-direct current single-phase-to-earth fault analysis instrument and grounding fault positioning system, the alternating current-direct current single-phase-to-earth fault analysis instrument include：Current detection circuit, for controlling the variation of electric current to detect the variation of current system under test (SUT) voltage-to-ground；Voltage sampling circuit is connected to current detection circuit, and data processing is carried out for acquiring current system under test (SUT) voltage-to-ground, and to voltage-to-ground；Ground resistance calculates module, is connected to current detection circuit, for calling corresponding detection algorithm to calculate ground resistance according to the voltage type of current system under test (SUT)；Voltage deviation amplitude Acquisition Circuit, the amplitude of voltage magnitude and current system under test (SUT) voltage-to-ground deviation for acquiring alternating current-direct current single-phase-to-earth fault analysis instrument itself；Microcontroller is used for control circuit, and carries out analysis calculating to earth fault.The present embodiment realizes the detection to ac and dc systems earth fault, improves the compatibility and accuracy of alternating current-direct current Earth Fault Detection, more fully meets the needs of users.
Description
Technical field
The utility model embodiment is related to grounding fault location technology more particularly to a kind of alternating current-direct current earth fault point
Analyzer and grounding fault positioning system.
Background technology
Earth design instrument is widely present in the every field such as electric power, telecommunications, metallurgy, petrochemical industry, weaving, and is played
Important function.If system earth failure cannot solve in time, huge security risk can be brought to generation.
Earthing searching instrument currently on the market is commonly DC system earth fault and searchs and locates instrument, mainly for direct current system
The earth fault occurred in system is searched.However, there is also earth fault hidden danger for AC system, but it is directed to currently not yet
The instrument of AC system grounding fault cannot meet the needs of active user, on the market for the ground connection of AC/DC universal
Trouble shoot instrument is even more a blank.
Utility model content
A kind of alternating current-direct current single-phase-to-earth fault analysis instrument of the utility model offer and grounding fault positioning system, are handed over realizing
Detection, analysis and the positioning of DC system earth fault.
In a first aspect, the utility model embodiment provides a kind of alternating current-direct current single-phase-to-earth fault analysis instrument, including：
Current detection circuit, for controlling the variation of electric current to detect the variation of current system under test (SUT) voltage-to-ground；
Voltage sampling circuit is connected to current detection circuit, for identification the voltage type of current system under test (SUT), acquires institute
Current system under test (SUT) voltage-to-ground is stated, and data processing is carried out to the current system under test (SUT) voltage-to-ground；
Ground resistance calculates module, is connected to the voltage sampling circuit, for different according to the current system under test (SUT)
Voltage type and voltage class call corresponding detection algorithm to calculate the ground resistance of the current system under test (SUT)；
Voltage deviation amplitude Acquisition Circuit, is connected to current detection circuit, for acquiring the alternating current-direct current earth fault point
The voltage magnitude of analyzer itself and the current system under test (SUT) voltage-to-ground deviation amplitude；
Microcontroller, be connected to the current detection circuit, the voltage sampling circuit, the ground resistance calculate module and
The voltage deviation amplitude Acquisition Circuit, for the current detection circuit, the voltage sampling circuit, the ground resistance
Computing module and the voltage deviation amplitude Acquisition Circuit are controlled, and are carried out to the earth fault of the current system under test (SUT)
Analysis calculates.
Second aspect, the utility model embodiment additionally provide a kind of grounding fault positioning system, including survey meter
With previously described alternating current-direct current single-phase-to-earth fault analysis instrument.
The utility model, can by a kind of alternating current-direct current single-phase-to-earth fault analysis instrument of offer and grounding fault positioning system
The Earth Fault Detection of compatible direct current system and AC system fills up the blank of current AC system grounding fault searching instrument device,
More fully meet needs of the user to Earth Fault Detection.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram for alternating current-direct current single-phase-to-earth fault analysis instrument that the utility model embodiment one provides；
Fig. 2 is the current detection circuit in a kind of alternating current-direct current single-phase-to-earth fault analysis instrument that the utility model embodiment one provides
Circuit diagram；
Fig. 3 is the voltage sampling circuit in a kind of alternating current-direct current single-phase-to-earth fault analysis instrument that the utility model embodiment one provides
Circuit diagram；
Fig. 4 is the voltage deviation amplitude in a kind of alternating current-direct current single-phase-to-earth fault analysis instrument that the utility model embodiment one provides
The circuit diagram of Acquisition Circuit；
Fig. 5 is a kind of structural schematic diagram for grounding fault positioning system that the utility model embodiment two provides.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, it illustrates only for ease of description, in attached drawing and the relevant part of the utility model rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of structural schematic diagram for alternating current-direct current single-phase-to-earth fault analysis instrument that the utility model embodiment one provides, such as
Shown in Fig. 1, which includes：
Current detection circuit 110, for controlling the variation of electric current to detect the variation of current system under test (SUT) voltage-to-ground；
Voltage sampling circuit 120 is connected to current detection circuit 110, for identification the voltage type of current system under test (SUT),
Current system under test (SUT) voltage-to-ground is acquired, and data processing is carried out to current system under test (SUT) voltage-to-ground；
Ground resistance calculates module 130, is connected to voltage sampling circuit 120, for different according to current system under test (SUT)
Voltage type and voltage class call corresponding detection algorithm to calculate the ground resistance of current system under test (SUT)；
Voltage deviation amplitude Acquisition Circuit 140, is connected to current detection circuit 110, for acquiring alternating current-direct current earth fault
The amplitude of the voltage magnitude of analyzer itself and current system under test (SUT) voltage-to-ground deviation；
Microcontroller 150 is connected to current detection circuit 110, voltage sampling circuit 120, ground resistance and calculates 130 and of module
Voltage deviation amplitude Acquisition Circuit 140, for calculating mould to current detection circuit 110, voltage sampling circuit 120, ground resistance
Block 130 and voltage deviation amplitude Acquisition Circuit 140 are controlled, and carry out analysis meter to the earth fault of current system under test (SUT)
It calculates.
Fig. 2 is the current detection circuit in a kind of alternating current-direct current single-phase-to-earth fault analysis instrument that the utility model embodiment one provides
Circuit diagram, as shown in Fig. 2, the current detection circuit includes：The operational amplifier IC7 of model OPA454, model
Triode T1, resistance R19, resistance R23, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, the electricity of 2N3439
Hinder R30, resistance R31, resistance R32, resistance R36, resistance R37, resistance R39, capacitance C35, capacitance C36, capacitance C37, capacitance
Light coupling relay U1, U2 and U3 of C38, model AQV259.
Wherein, the pin 3 of the operational amplifier IC7 is connected to microcontroller, and the pin 1 of the operational amplifier IC7 connects
Ground, the pin 6 of the operational amplifier IC7 are connected to the base stage of the triode T1, the emitter connection of the triode T1
To the first end of the resistance R30, the first end of the resistance R23, the first end of the resistance R25, the resistance R26 the
One end, the resistance R28 first end and the resistance R29 first end, the second end of the resistance R30 is connected to the fortune
The pin 2 of calculation amplifier IC7, the first of the first end of the resistance R36, the first end of the capacitance C35 and the capacitance C36
End, the second end of the resistance R36 are connected to the first end of the resistance R39, the second end of the resistance R39, the capacitance
The second end of C35 and the second end of the capacitance C36 ground connection, the second end of the resistance R23, the second end of the resistance R25,
The second end of the second end of the resistance R26, the second end of the resistance R28 and the resistance R29 is connected to the resistance R31
First end, described light coupling relay U1, U2 and U3 pin 4, the pin 1 of described light coupling relay U1, U2 and U3 connects respectively
It is connected to the first end of the resistance R19, the first end of the first end and the resistance R32 of the resistance R27, the resistance R19
Second end, the second end of the second end of the resistance R27 and the resistance R32 be respectively connected to microcontroller, the optocoupler after
The pin 2 of electric appliance U1, U2 and U3 is grounded, the pin 6 of described light coupling relay U1, U2 and U3 be respectively connected to APHASE,
The ends BPHASE and CPHASE, this end APHASE, BPHASE and CPHASE correspond to the three of the alternating current-direct current single-phase-to-earth fault analysis instrument respectively
The second end of a voltage detecting access port, the resistance R31 is respectively connected to the first end of the resistance R37, the capacitance C37
First end and the capacitance C38 first end, the second end of the resistance R37, the second end of the capacitance C37 and the electricity
Hold the second end ground connection of C38.
The voltage Uout of the pin PA4 outputs of microcontroller is transmitted to the pin of model OPA454 operational amplifiers IC7
3, wherein voltage Uout is 0~2.5V.A model is connected on the output pin 6 of operational amplifier IC7
The triode of 2N3439, in the first end of the emitter connection resistance R30 of the triode, the second end of resistance R30 is connected to this
On the pin 2 of operational amplifier IC7, feedback network is thus formed, what formation one was controlled by the pin 3 of operational amplifier IC7
One amplifying circuit.
The operation principle of the circuit diagram is：The adjustable voltage of 0~2.5V of pin PA4 control outputs of microcontroller is put to operation
The pin 3 of big device IC7 is exported extremely after the feedback network of operational amplifier IC7 compositions by the pin 6 of operational amplifier IC7
The base stage of triode T1, the amplification factor for controlling triode T1 so that the emitter of triode T1 exports the electricity of 0~50V
Pressure value, the electricity after voltage value output by being composed in parallel by resistance R23, resistance R25, resistance R26, resistance R28 and resistance R29
The current value obtained after resistance is output to light coupling relay U1, U2 and U3, and light coupling relay U1, U2 and U3 herein serve as switch
Effect.The controlling switch of light coupling relay U1, U2 and U3 of model AQY259 are pin 1 and pin 2, with light coupling relay
For U1, the pin 2 of light coupling relay U1 is grounded, when pin 1 is high level, the pin 4 and pin 6 of light coupling relay U1
Conducting, when pin 1 is low level, the pin 4 and pin 6 of light coupling relay U1 disconnect, the work of light coupling relay U2 and U3
Principle and light coupling relay U1 it is identical, the pin of light coupling relay U1, U2 and U3 6 corresponding APHASE,
BPHASE and CPHASE is respectively connected to three voltage detecting access ports on alternating current-direct current single-phase-to-earth fault analysis instrument.It needs to illustrate
, the controlling switch 1 of light coupling relay U1, U2 and U3 is respectively connected to pin PA5, PA6 and PA7 of microcontroller, microcontroller
Low and high level by controlling the controlling switch 1 of light coupling relay U1, U2 and U3 connects respectively to control the pin 4 of light coupling relay
Enter corresponding the be connected to alternating current-direct current of APHASE, BPHASE and CPHASE of 6 institute of pin to light coupling relay U1, U2 and U3
On three detection access ports on single-phase-to-earth fault analysis instrument, when the pin 4 of light coupling relay is linked into alternating current-direct current earth fault point
When three voltage detecting access ports in analyzer, current system under test (SUT) voltage-to-ground value can change.
Fig. 3 is the voltage sampling circuit in a kind of alternating current-direct current single-phase-to-earth fault analysis instrument that the utility model embodiment one provides
Circuit diagram, as shown in figure 3, the voltage sampling circuit includes：Resistance R6, resistance R7, resistance R8, resistance R9, resistance
R11, resistance R70, resistance R71, capacitance C18, capacitance C19, capacitance C20, resistance C23, diode D5, diode D6, diode
The operational amplifier IC2 of D7 and model OP-07.
Wherein, the first end of the resistance R8 be connected to the operational amplifier IC2 pin 3 and capacitance C23 first
End, the second end of the resistance R8 are connected to the first end of the first end and the capacitance C18 of the resistance R7, the capacitance
The second end of C18 is connected to the first end of the pin 2 of the operational amplifier IC2, pin 6 and resistance R9, the resistance R9
Second end be connected to the cathode and microcontroller of the anode of the diode D5, diode D6, the cathode of the diode D5 connects
It is connected to+3.3V power supplys, the plus earth of the diode D6, the second end ground connection of the capacitance C23, the operational amplifier
The pin 7 of IC2 is connected to+5V power supplys, and the pin 4 of the operational amplifier IC2 is connected to -5V power supplys, the resistance R7's
Second end is connected to the first end of the resistance R11, the first end of the capacitance C19, the first end of the capacitance C20 and institute
State the first end of resistance R6, the second end of the resistance R11, the second end of the capacitance C19, the second end of the capacitance C20
It is grounded with the second end of the capacitance C23, the second end of the resistance R6 is connected to the cathode of the diode D7, two pole
The anode of pipe D7 is connected to the first end of the resistance R70 first ends and the resistance R71, the resistance R70 second ends and institute
State the second end ground connection of resistance R71.
Wherein, PC5 is the acquisition pin of microcontroller, and the ends BPHASE are connected to the alternating current-direct current single-phase-to-earth fault analysis instrument wherein
One voltage detecting access port.It should be noted that being connected to the other two voltage detecting of alternating current-direct current single-phase-to-earth fault analysis instrument
The voltage sampling circuit of access port is identical with this, and is no longer illustrated herein.
Voltage sampling circuit identifies the voltage type and voltage class of current system under test (SUT), electric over the ground to current system under test (SUT)
Pressure is acquired, and wherein voltage type is DC voltage or alternating voltage, voltage class 220V, 380V, 450V, 750V
And 1000V.The collected voltage of voltage detecting access port carries out rectification by rectifier diode, and alternating voltage is converted to direct current
Voltage solves the difference of alternating voltage and DC voltage in acquisition, two different circuits need not be respectively adopted to acquire
Alternating voltage and DC voltage.As shown in figure 3, the voltage that BPHASE is terminated after diode D7 rectifications by obtaining direct current
Pressure, is then divided by resistance R6 and resistance R11, which passes through operational amplifier IC2, the resistance of model OP-07
The second-order low-pass filter circuit of R7, resistance R8, capacitance C18 and capacitance C23 compositions, voltage acquisition mouth is reached using resistance R9
Afterwards, digital signal is converted from analog into the voltage collected using the analog-digital converter in microcontroller.Its
In, diode D5 and diode D6 play clamper protective effects, prevent the excessive microcontroller that burns out of voltage during voltage sample
Acquire pin.
Ground resistance calculates module, is connected to voltage sampling circuit, for according to the different electricity of the current system under test (SUT)
The ground resistance for pressing type and voltage class that corresponding detection algorithm is called to calculate the current system under test (SUT).Wherein, ground connection electricity
Resistance computing module is the calculating that ground resistance is executed in microcontroller.Microcontroller is by controlling light coupling relay U1, U2 and U3
The low and high level of controlling switch 1 controls the pin that the pin 4 of light coupling relay is respectively connected to light coupling relay U1, U2 and U3
6 three voltages inspection on corresponding the be connected to alternating current-direct current single-phase-to-earth fault analysis instrument of APHASE, BPHASE and CPHASE
It surveys on access port.These three light coupling relays U1, U2 and U3 are to open one by one, when the pin 4 of light coupling relay is linked into friendship directly
When flowing three detection access ports on single-phase-to-earth fault analysis instrument, voltage value over the ground can change, and microcontroller passes through acquisition
Voltage value before changing and the voltage value after changing, can calculate these three detections by corresponding algorithm and connect
The resistance value size of entrance over the ground judges that current inspection systems whether there is failure according to the size of the resistance value.
It should be noted that in order to realize that AC system and Design of DC System Grounding Fault Detection have good compatibility,
AC system and immediate system earth fault use the detection method of same principle.Detection method provided in this embodiment is balance
Bridge method is combined with nonequilibrium bridge method.After the voltage type that alternating current-direct current single-phase-to-earth fault analysis instrument identifies access to its into
Then row sampling is directed to the different types of electrical voltage system identified and uses different detection algorithms, wherein voltage type is divided into
DC voltage and alternating voltage.By the detection algorithm, the setting and startup of nonequilibrium bridge, inspection are carried out according to the parameter of setting
The variation of current system under test (SUT) voltage-to-ground is surveyed, then according to the corresponding respective algorithms of different types of current system under test (SUT) to it
Carry out the calculating of ground resistance.
Fig. 4 is the voltage deviation amplitude in a kind of alternating current-direct current single-phase-to-earth fault analysis instrument that the utility model embodiment one provides
The circuit diagram of Acquisition Circuit, as shown in figure 4, the voltage deviation amplitude Acquisition Circuit includes：Resistance R20, resistance R21, electricity
Hinder the operational amplifier of R22, resistance R24, capacitance C32, capacitance C33, diode D12, diode D13 and model OP-07
IC6。
Wherein, the pin 3 of the operational amplifier IC6 connects the of the resistance R21 first ends and the capacitance C33
One end, the second end ground connection of the capacitance C33, the second end of the resistance R21 are connected to first end and the institute of the resistance R20
The first end of capacitance C32 is stated, the pin 2 of the operational amplifier IC6 connects the second end of the capacitance C32, the resistance
The second end of the pin 6 of the first end of R22 and the operational amplifier IC6, the resistance R22 is connected to the diode D12
Positive, described diode D13 cathode and the resistance R24 first end, the cathode of the diode D12 connects+3.3V electricity
The pin 7 in source, the plus earth of the diode D13, the operational amplifier IC6 connects+5V power supplys, the operational amplifier
The pin 4 of IC6 connects -5V power supplys.
Wherein, voltage deviation amplitude Acquisition Circuit includes：The voltage magnitude of alternating current-direct current single-phase-to-earth fault analysis instrument itself acquires
Circuit and current system under test (SUT) voltage-to-ground deviation amplitude Acquisition Circuit, the circuit structures of the two Acquisition Circuits be it is identical,
As shown in Figure 4.In conjunction with the circuit diagram of Fig. 2 and Fig. 4, in detection process, alternating current-direct current single-phase-to-earth fault analysis instrument itself
Voltage is divided by resistance R36 and R39, and the voltage after partial pressure is input into the voltage amplitude of alternating current-direct current single-phase-to-earth fault analysis instrument itself
It is worth Acquisition Circuit, which passes through operational amplifier IC6, resistance R20, resistance R21, capacitance C32 and the capacitance of model OP-07
After the second-order low-pass filter of C33 compositions, is divided, obtained final with reference voltage using resistance R22 and resistance R24
Voltage value, which directly passes back to the included analog-digital converter of microcontroller, after analog signal conversion digital signal,
It is shown on the display screen of alternating current-direct current single-phase-to-earth fault analysis instrument after numerical algorithm is handled.Likewise, in detection process
In, the acquisition of current system under test (SUT) voltage-to-ground deviation amplitude also uses above-mentioned identical principle, by resistance R31 and resistance
R37 is divided, and the voltage after partial pressure is input into current system under test (SUT) voltage-to-ground deviation amplitude Acquisition Circuit, by above-mentioned identical
Processing after, the voltage deviation amplitude by obtained current system under test (SUT) includes the display screen in alternating current-direct current single-phase-to-earth fault analysis instrument
On.
In existing grounding fault device, without device provide detection device from detection failure process in because
The size of voltage is needed to cut the voltage fluctuation amplitude of bridge generation and starting device itself detection in detection process, therefore is much used
Whether family can not assess the grounding fault device latent to system under test (SUT) presence in detecting current system under test (SUT) failure process
It is threatening.Therefore, the present embodiment to alternating current-direct current single-phase-to-earth fault analysis instrument by detecting required voltage size and in detection process
In current system under test (SUT) voltage-to-ground deviation amplitude carry out real-time display, the voltage deviation amplitude assessment that user passes through the display is handed over
Whether to current system under test (SUT), there are potential threats for DC ground fault analyzer；Furthermore it is also possible to by checking detection process
In current system under test (SUT) voltage-to-ground deviation amplitude size, adjusted accordingly in conjunction with the nature of trouble of current system under test (SUT)
It is whole, to be applicable in the fault types of all systems under test (SUT), working efficiency is improved in detecting failure process, better ensures that and is
The safe operation of system.
The present embodiment passes through electricity by providing a kind of alternating current-direct current single-phase-to-earth fault analysis instrument, the alternating current-direct current single-phase-to-earth fault analysis instrument
Current detection circuit controls the variation of electric current to detect the variation of current system under test (SUT) voltage-to-ground；Voltage sampling circuit is connected to
Current detection circuit identifies the voltage type and voltage class of current system under test (SUT), acquires current system under test (SUT) voltage-to-ground, and
Data processing is carried out to current system under test (SUT) voltage-to-ground；Ground resistance calculates module, voltage sampling circuit is connected to, according to institute
It states the different voltage type of current system under test (SUT) and voltage class calls corresponding detection algorithm to calculate the current system under test (SUT)
Ground resistance；Voltage deviation amplitude Acquisition Circuit is connected to the current detection circuit, acquires the alternating current-direct current earth fault point
The amplitude of the voltage magnitude of analyzer and the system under test (SUT) voltage-to-ground deviation；Microcontroller is connected to voltage sampling circuit, electric current
Detection circuit, ground resistance calculate module and voltage deviation amplitude Acquisition Circuit, real for carrying out analysis calculating to earth fault
Show the detection to AC system and DC system earth fault, improves the compatible and accurate of alternating current-direct current Earth Fault Detection
Property, more fully meet the needs of users.
Embodiment two
Fig. 5 is a kind of structural schematic diagram for grounding fault positioning system that the utility model embodiment two provides, such as
Shown in Fig. 5, on the basis of the above embodiments, which includes survey meter and above-mentioned alternating current-direct current ground connection
Fault analysis instrument.
The grounding fault positioning system further includes indicator light (not shown), display screen and voice broadcast module
(not shown), wherein indicator light is for indicating the fault state of current system under test (SUT)；Display screen is worked as showing
The fault message of preceding system under test (SUT)；Voice broadcast module is used for the fault message of the current system under test (SUT) of voice broadcast.
With continued reference to Fig. 5, as shown in figure 5, the figure on the left side is alternating current-direct current single-phase-to-earth fault analysis instrument, the figure on the right is detection
Device, wherein 1 is the display screen on alternating current-direct current single-phase-to-earth fault analysis instrument, and 2 be power interface, and 3,4,5 and 6 interfaces are worked as acquiring
The voltage of preceding system under test (SUT), 7 be switch button, and 8 be current acquisition interface, and 9 be the display screen on survey meter, and 10,11 and 12 are
Function button corresponds to different test functions respectively, wherein and 6 interfaces are the ground wires of alternating current-direct current single-phase-to-earth fault analysis instrument, if
Current system under test (SUT) is straight-flow system, then what is accessed herein is the ground wire of straight-flow system；If current system under test (SUT) is exchange system
System, then what is accessed herein is the zero curve of AC system.
When detecting that current system under test (SUT) breaks down, the event using survey meter to the circuit to be measured of current system under test (SUT)
Barrier electric current is detected.Current acquisition interface 8 connects current collector, which is used to treat the failure in survey time road
Electric current is detected, if there are fault current in circuit to be measured, current collector can detect current circuit to be measured
In current value size, wherein current collector can be sine-wave current collector and square wave current collector.According to phase
The type for the collected current signal of current collector answered, after corresponding filter amplifying processing, analog-to-digital conversion, gained
Digital data transmission to microcontroller carries out data processing, and the digital signal is after Fast Fourier Transform (FFT) is handled with the shape of waveform
Formula is transmitted to survey meter, which is handled according to the data received according to corresponding algorithm, obtains corresponding failure
Information is shown on display screen 9, and is reported to fault message by voice broadcast module.
In the present embodiment, grounding fault positioning system includes：Alternating current-direct current single-phase-to-earth fault analysis instrument and survey meter,
In, alternating current-direct current single-phase-to-earth fault analysis instrument mainly analyze by the information such as the insulation status to current system under test (SUT) and current voltage
And judgement, survey meter is for the lookup and positioning to fault point.The survey meter passes through wireless with alternating current-direct current single-phase-to-earth fault analysis instrument
Mode connects.The information for acquiring, detecting and being calculated is sent to survey meter by alternating current-direct current single-phase-to-earth fault analysis instrument, the detection
The size of current that instrument is detected according to the fault message combination current collector that the analyzer is sent is obtained carries out fault point
Positioning.
Present embodiments provide a kind of Earth design system, the grounding fault positioning system include survey meter and
Alternating current-direct current single-phase-to-earth fault analysis instrument can realize the detection, lookup and positioning of ac and dc systems earth fault, improve alternating current-direct current and connect
The compatibility and accuracy of earth fault positioning system, more fully meet the needs of users.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious variation is readjusted and is substituted without departing from the scope of protection of the utility model.Therefore, although passing through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
Can also include other more equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Right determine.
Claims (10)
1. a kind of alternating current-direct current single-phase-to-earth fault analysis instrument, which is characterized in that including：
Current detection circuit, for controlling the variation of electric current to detect the variation of current system under test (SUT) voltage-to-ground；
Voltage sampling circuit is connected to current detection circuit, for identification the voltage type and voltage class of current system under test (SUT),
The current system under test (SUT) voltage-to-ground is acquired, and data processing is carried out to the current system under test (SUT) voltage-to-ground；
Ground resistance calculates module, is connected to the voltage sampling circuit, for according to the different electricity of the current system under test (SUT)
It presses type and voltage class to call corresponding detection algorithm, calculates the ground resistance of the current system under test (SUT)；
Voltage deviation amplitude Acquisition Circuit, is connected to current detection circuit, for acquiring the alternating current-direct current single-phase-to-earth fault analysis instrument
The voltage magnitude of itself and the current system under test (SUT) voltage-to-ground deviation amplitude；
Microcontroller is connected to the current detection circuit, the voltage sampling circuit, the ground resistance and calculates module and described
Voltage deviation amplitude Acquisition Circuit, for calculating the current detection circuit, the voltage sampling circuit, the ground resistance
Module and the voltage deviation amplitude Acquisition Circuit are controlled, and are analyzed the earth fault of the current system under test (SUT)
It calculates.
2. alternating current-direct current single-phase-to-earth fault analysis instrument according to claim 1, which is characterized in that the current detection circuit packet
It includes：The operational amplifier IC7 of model OPA454, the triode T1 of model 2N3439, resistance R19, resistance R23, resistance
R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R36, resistance R37,
Light coupling relay U1, U2 and U3 of resistance R39, capacitance C35, capacitance C36, capacitance C37, capacitance C38, model AQV259；
The pin 3 of the operational amplifier IC7 is connected to microcontroller, and the pin 1 of the operational amplifier IC7 is grounded, the fortune
The pin 6 for calculating amplifier IC7 is connected to the base stage of the triode T1, and the emitter of the triode T1 is connected to the resistance
It is the first end of R30, the first end of the resistance R23, the first end of the resistance R25, the first end of the resistance R26, described
The second end of the first end of the first end of resistance R28 and the resistance R29, the resistance R30 is connected to the operational amplifier
The first end of the pin 2 of IC7, the first end of the resistance R36, the first end and the capacitance C36 of the capacitance C35, it is described
The second end of resistance R36 is connected to the first end of the resistance R39, the second end of the resistance R39, the capacitance C35
The second end of two ends and the capacitance C36 are grounded, the second end of the resistance R23, the second end of the resistance R25, the electricity
The second end for hindering the second end of R26, the second end of the resistance R28 and the resistance R29 is connected to the first of the resistance R31
It holds, the pin 4 of described light coupling relay U1, U2 and U3, the pin 1 of described light coupling relay U1, U2 and U3 are respectively connected to institute
State the first end of resistance R19, the first end of the first end and the resistance R32 of the resistance R27, the second of the resistance R19
End, the second end of the resistance R27 and the resistance R32 second end be respectively connected to microcontroller, the light coupling relay U1,
The pin 2 of U2 and U3 is grounded, and the pin 6 of described light coupling relay U1, U2 and U3 are respectively connected to the alternating current-direct current earth fault
The voltage detecting access port of analyzer, the second end of the resistance R31 are respectively connected to the first end of the resistance R37, described
The first end of the first end of capacitance C37 and the capacitance C38, the second end of the resistance R37, the second end of the capacitance C37
It is grounded with the second end of the capacitance C38.
3. alternating current-direct current single-phase-to-earth fault analysis instrument according to claim 1, which is characterized in that the voltage sampling circuit packet
It includes：Resistance R6, resistance R7, resistance R8, resistance R9, resistance R11, resistance R70, resistance R71, capacitance C18, capacitance C19, capacitance
The operational amplifier IC2 of C20, resistance C23, diode D5, diode D6, diode D7 and model OP-07；
The first end of the resistance R8 is connected to the first end of the pin 3 and capacitance C23 of the operational amplifier IC2, the electricity
The second end of resistance R8 is connected to the first end of the first end and the capacitance C18 of the resistance R7, the second end of the capacitance C18
It is connected to the pin 2 of the operational amplifier IC2, the first end of pin 6 and resistance R9, the second end connection of the resistance R9
The cathode of the extremely cathode and microcontroller of the anode of the diode D5, diode D6, the diode D5 is connected to+3.3V electricity
Source, the plus earth of the diode D6, the second end ground connection of the capacitance C23, the pin 7 of the operational amplifier IC2 connect
+ 5V power supplys are connected to, the pin 4 of the operational amplifier IC2 is connected to -5V power supplys, and the second end of the resistance R7 is connected to institute
State the first end of resistance R11, the first end of the capacitance C19, the first end of the capacitance C20 and the resistance R6 first
End, the second end of the resistance R11, the second end of the capacitance C19, the second end of the capacitance C20 and the capacitance C23
Second end is grounded, and the second end of the resistance R6 is connected to the cathode of the diode D7, the anode connection of the diode D7
The second of the extremely first end of the resistance R70 first ends and the resistance R71, the resistance R70 second ends and the resistance R71
End ground connection.
4. alternating current-direct current single-phase-to-earth fault analysis instrument according to claim 2, which is characterized in that the voltage deviation amplitude acquisition
Circuit includes：Resistance R20, resistance R21, resistance R22, resistance R24, capacitance C32, capacitance C33, diode D12, diode D13
With the operational amplifier IC6 of model OP-07；
The pin 3 of the operational amplifier IC6 connects the first end of the resistance R21 first ends and the capacitance C33, the electricity
Hold the second end ground connection of C33, the second end of the resistance R21 is connected to the first end of the resistance R20 and the capacitance C32
First end, the pin 2 of the operational amplifier IC6 connect the second end of the capacitance C32, the first end of the resistance R22 and
The pin 6 of the operational amplifier IC6, the second end of the resistance R22 are connected to positive, described the two of the diode D12
The second end of the first end of the cathode of pole pipe D13 and the resistance R24, the resistance R24 is connected to reference voltage, two pole
The cathode of pipe D12 connects+3.3V power supplys, and the pin 7 of the plus earth of the diode D13, the operational amplifier IC6 meets+5V
The pin 4 of power supply, the operational amplifier IC6 connects -5V power supplys.
5. alternating current-direct current single-phase-to-earth fault analysis instrument according to claim 4, which is characterized in that if the second of the resistance R20
End is connected to the first end of resistance R37, and the voltage deviation amplitude Acquisition Circuit acquires the system under test (SUT) voltage-to-ground at this time
The amplitude of deviation；
If the second end of the resistance R20 is connected to the first end of resistance R39, the voltage deviation amplitude Acquisition Circuit is adopted at this time
Collect the voltage magnitude of the alternating current-direct current single-phase-to-earth fault analysis instrument.
6. a kind of grounding fault positioning system, which is characterized in that including survey meter and claim 1-5 any one of them
Alternating current-direct current single-phase-to-earth fault analysis instrument；
The survey meter is wirelessly connect with the alternating current-direct current single-phase-to-earth fault analysis instrument.
7. grounding fault positioning system according to claim 6, which is characterized in that the survey meter is according to getting
The alternating current-direct current single-phase-to-earth fault analysis instrument send fault message, fault point is positioned.
8. grounding fault positioning system according to claim 6, which is characterized in that the grounding fault positioning
System further includes indicator light, is indicated for the fault state to current system under test (SUT).
9. grounding fault positioning system according to claim 6, which is characterized in that the grounding fault positioning
System further includes display screen, the fault message for showing current system under test (SUT).
10. grounding fault positioning system according to claim 6, which is characterized in that the grounding fault is fixed
Position system further includes voice broadcast module, is used for the fault message of the current system under test (SUT) of voice broadcast.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820094514.1U CN207851196U (en) | 2018-01-18 | 2018-01-18 | A kind of alternating current-direct current single-phase-to-earth fault analysis instrument and grounding fault positioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820094514.1U CN207851196U (en) | 2018-01-18 | 2018-01-18 | A kind of alternating current-direct current single-phase-to-earth fault analysis instrument and grounding fault positioning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456210A (en) * | 2019-09-16 | 2019-11-15 | 西安太世德航空电器有限公司 | 1553B network-bus trouble point checking method, apparatus and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456210A (en) * | 2019-09-16 | 2019-11-15 | 西安太世德航空电器有限公司 | 1553B network-bus trouble point checking method, apparatus and system |
| CN110456210B (en) * | 2019-09-16 | 2024-03-26 | 西安太世德航空电器有限公司 | 1553B network bus fault point detection method, device and system |
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