CN206411193U - A kind of voltage and current conversion equipment of mesh grounding impedance measurement - Google Patents
A kind of voltage and current conversion equipment of mesh grounding impedance measurement Download PDFInfo
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- CN206411193U CN206411193U CN201720124113.1U CN201720124113U CN206411193U CN 206411193 U CN206411193 U CN 206411193U CN 201720124113 U CN201720124113 U CN 201720124113U CN 206411193 U CN206411193 U CN 206411193U
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Abstract
This application discloses a kind of voltage and current conversion equipment of mesh grounding impedance measurement, including：Input interface to be measured, transmitter and output interface to be measured；The input interface to be measured includes：Control source interface and electric current input interface；The transmitter includes：It is to be measured to compare interface, voltage transmitter and current transducer；The voltage transmitter includes：Voltage amplifier circuit and voltage attenuation circuit；The current transducer includes：Current amplification circuit and the 5th resistance.The automatic conversioning broad of mesh grounding testing impedance voltage and current is efficiently solved, the electric current and voltage automatic measurement of gamut is realized.
Description
Technical field
The utility model is related to mesh grounding impedance measurement device field, more particularly to a kind of mesh grounding impedance measurement
Voltage and current conversion equipment.
Background technology
Power plant, grounding net of transformer substation except for various electrical equipments common reference is provided, it is prior, system hair
Raw earth fault is divided by the fault current that can fast and effeciently be released when being struck by lightning, improvement grounded screen and place earth's surface ground potential
Cloth, ensures a secondary device and personal security, is the weight for safeguarding power system security reliability service, support personnel and equipment safety
Want measure.
Impedance ground (custom is referred to as " grounding resistance ", the actually impedance value with perceptual weight) be reaction grounded screen performance and
The most important parameter of state quality, the definition of impedance ground is, to power network injection test electric current Im, then to measure ground with voltmeter
Net corresponding current potential lifting U, impedance ground Z=U/Im.It can be seen that, all test structures of grounded screen set up the injection in earth mat
In the basic data for testing electric current Im and current potential U.Therefore, the value for accurately obtaining injection test electric current Im and current potential U is extremely important,
Directly affect test result.
But, injection test electric current Im is relevant with on-site soil resistivity, electric current infusion circuit impedance magnitude, the electricity of injection
Stream is bigger, and the voltage of test is bigger, and the electric current of injection is smaller, and the voltage of test is smaller, existing mesh grounding impedance measurement dress
Put detection range single, and the precision tested is low, is that onsite application brings inconvenience.
Utility model content
The utility model provides a kind of voltage and current conversion equipment of mesh grounding impedance measurement, is connect with solving earth mat
The problem of voltage and current detection range is single during ground testing impedance.
According to embodiments herein, there is provided a kind of voltage and current converter device of mesh grounding impedance measurement, bag
Include：Input interface to be measured, transmitter and output interface to be measured；
The input interface to be measured includes：Control source interface and electric current input interface；
The transmitter includes：It is to be measured to compare interface, voltage transmitter and current transducer；
The voltage transmitter includes：Voltage amplifier circuit and voltage attenuation circuit；
The current transducer includes：Current amplification circuit and the 5th resistance；
The output end of the control source interface is connected with the input of the voltage transmitter；
The output end of the electric current input interface is connected with the input of the current transducer；
The interface to be measured that compares is put with the voltage amplifier circuit, the voltage attenuation circuit, the electric current respectively
Big circuit and the output interface connection to be measured；
The voltage amplifier circuit is in parallel with the voltage attenuation circuit；
Connected with the output end of the electric current input interface one end of 5th resistance；
The other end of 5th resistance is connected with the current amplification circuit.
Further, the voltage attenuation circuit includes：First switch, the first relay, the second relay, the 3rd relay
Device, the 4th relay, first resistor, second resistance, 3rd resistor and the 4th resistance；
The output end to be measured for comparing interface is connected with the first switch and the output interface to be measured respectively；
The first resistor, the second resistance, the 3rd resistor constitute main line of connecting with the 4th resistant series；
First relay, second relay, the 3rd relay and the 4th relay are parallel with one another
Constitute parallel branch；
One end of second relay is connected with the output end of the first resistor, the other end of second relay
Connected with the input to be measured for being compared interface；
One end of 3rd relay is connected with the output end of the second resistance, the other end of the 3rd relay
Connected with the input to be measured for being compared interface；
One end of 4th relay is connected with the output end of the 3rd resistor, the other end of the 4th relay
Connected with the input to be measured for being compared interface.
Further, the voltage amplifier circuit includes：First switch, second switch, third switch, the 5th relay,
6th relay, the 7th relay, the first amplifier, the second amplifier and the 3rd amplifier；
The output end to be measured for comparing interface is connected with the first switch and the output interface to be measured respectively；
First amplifier, second amplifier, the 3rd amplifier, the second switch and the described 3rd are opened
Pass is composed in series series connection main line；
5th relay, the 6th relay and the 7th relay composition parallel branch parallel with one another；
One end of 5th relay is connected with the output end of first amplifier, the 5th relay it is another
Hold and connected with the input to be measured for being compared interface；
One end of 6th relay is connected with the output end of second amplifier, the 6th relay it is another
Hold and connected with the input to be measured for being compared interface；
One end of 7th relay is connected with the output end of the 3rd amplifier, the 7th relay it is another
Hold and connected with the input to be measured for being compared interface.
Further, the current amplification circuit includes：4th switch, the 5th switch, the 6th switch, the 8th relay,
9th relay, the tenth relay, the 11st relay, the 5th resistance, the 4th amplifier, the 5th amplifier and the 6th amplification
Device；
The output end to be measured for comparing interface is connected with the described 4th switch and the output interface to be measured respectively；
4th amplifier, the 5th amplifier, the 6th amplifier, the 5th switch and the described 6th are opened
Pass is composed in series series connection main line；
9th relay, the tenth relay and the 11st relay composition parallel branch parallel with one another；
One end of 9th relay is connected with the output end of the 4th amplifier, the 9th relay it is another
Hold and connected with the input to be measured for being compared interface；
One end of tenth relay is connected with the output end of the 5th amplifier, the tenth relay it is another
Hold and connected with the input to be measured for being compared interface；
One end of 11st relay is connected with the output end of the 6th amplifier, the 11st relay
The other end is connected with the input to be measured for being compared interface.
From above technology, this application provides a kind of voltage and current conversion equipment of mesh grounding impedance measurement,
Including：Input interface to be measured, transmitter and output interface to be measured；The input interface to be measured includes：Control source connects
Mouth and electric current input interface；The transmitter includes：It is to be measured to compare interface, voltage transmitter and current transducer；The electricity
Pressure transmitter includes：Voltage amplifier circuit and voltage attenuation circuit；The current transducer includes：Current amplification circuit and the 5th
Resistance；The output end of the control source interface is connected with the input of the voltage transmitter；The electric current input interface
Output end is connected with the input of the current transducer；It is described it is to be measured compare interface respectively with the voltage amplifier circuit,
The voltage attenuation circuit, the current amplification circuit and the output interface connection to be measured；The voltage amplifier circuit with
The voltage attenuation circuit is in parallel；Connected with the output end of the electric current input interface one end of 5th resistance；Described
The other end of five resistance is connected with the current amplification circuit.
In use, staff sends virtual voltage or current signal to described treat by the input interface to be measured
Measurement is compared interface and is compared, and the voltage amplifier circuit, the voltage attenuation circuit or described are selected according to comparative result
Current amplification circuit；The transmitter is changed；Voltage signal after conversion is by the interface to be measured that compares with presetting
Reference voltage level is compared, if meeting the predetermined reference voltage value, the voltage signal after conversion is treated by described
Measure output interface output；If not meeting the predetermined reference voltage value, it is retransmitted to the transmitter and is changed,
It is then that the voltage signal after conversion is defeated by the output interface to be measured untill meeting the predetermined reference voltage value
Go out.
Brief description of the drawings
In order to illustrate more clearly of the technical solution of the utility model, below by the required accompanying drawing used in embodiment
It is briefly described, it should be apparent that, for those of ordinary skills, do not paying the premise of creative labor
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of the voltage and current conversion equipment of mesh grounding impedance measurement of the utility model；
Fig. 2 connects for input to be measured in a kind of voltage and current conversion equipment of mesh grounding impedance measurement of the utility model
The structural representation of mouth；
Fig. 3 is voltage transmitter in a kind of voltage and current conversion equipment of mesh grounding impedance measurement of the utility model
Internal structure schematic diagram；
Fig. 4 is current transducer in a kind of voltage and current conversion equipment of mesh grounding impedance measurement of the utility model
Internal structure schematic diagram；
Fig. 5 is voltage transmitter in a kind of voltage and current conversion equipment of mesh grounding impedance measurement of the utility model
Circuit theory diagrams；
Fig. 6 is current transducer in a kind of voltage and current conversion equipment of mesh grounding impedance measurement of the utility model
Circuit theory diagrams.
Illustrate：
Wherein：1- input interfaces to be measured, 11- control source interfaces, 12- electric current input interfaces, 2- transmitters, 3- is to be measured
Amount compares interface, and 4- output interfaces to be measured, 5- voltage transmitters, 6- voltage amplifier circuits, 61- second switches, 62- the 3rd is opened
Close, the relays of 63- the 5th, the relays of 64- the 6th, the relays of 65- the 7th, the amplifiers of 66- first, the amplifiers of 67- second, 68-
3rd amplifier, 7- voltage attenuation circuits, 71- first switches, the relays of 72- first, the relays of 73- second, the relays of 74- the 3rd
Device, the relays of 75- the 4th, 76- first resistors, 77- second resistances, 78- 3rd resistors, the resistance of 79- the 4th, 8- electric current pick-ups
Device, 9- current amplification circuits, 901- the 4th is switched, the amplifiers of 902- the 4th, and 903- the 5th is switched, the amplifiers of 904- the 5th,
905- the 6th is switched, the amplifiers of 906- the 6th, the relays of 907- the 8th, the relays of 908- the 9th, the relays of 909- the tenth, 910-
11st relay, the resistance of 911- the 5th.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clear, complete description, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
With reference to Fig. 1, a kind of structural representation of the voltage and current conversion equipment of mesh grounding impedance measurement, with reference to Fig. 2,
The structural representation of input interface to be measured in a kind of voltage and current conversion equipment of mesh grounding impedance measurement, with reference to Fig. 3,
The internal structure schematic diagram of voltage transmitter in a kind of voltage and current conversion equipment of mesh grounding impedance measurement, and refer to
The internal structure schematic diagram of current transducer in Fig. 4, a kind of voltage and current conversion equipment of mesh grounding impedance measurement.
A kind of voltage and current conversion equipment for mesh grounding impedance measurement that the present embodiment is provided, including：It is to be measured defeated
Incoming interface 1, transmitter 2 and output interface to be measured 4；
The input interface to be measured 1 includes：Control source interface 11 and electric current input interface 12；
The transmitter 2 includes：It is to be measured to compare interface 3, voltage transmitter 5 and current transducer 8；
The voltage transmitter 5 includes：Voltage amplifier circuit 6 and voltage attenuation circuit 7；
The current transducer 8 includes：The resistance 91 of current amplification circuit 9 and the 5th；
The output end of the control source interface 11 is connected with the input of the voltage transmitter 5；
The output end of the electric current input interface 12 is connected with the input of the current transducer 8；
It is described it is to be measured compare interface 3 respectively with the voltage amplifier circuit 6, the voltage attenuation circuit 7, the electric current
Amplifying circuit 9 and the output interface to be measured 4 are connected；
The voltage amplifier circuit 6 is in parallel with the voltage attenuation circuit 7；
Connected with the output end of the electric current input interface 12 one end of 5th resistance 91；
The other end of 5th resistance 91 is connected with the current amplification circuit 9.
From above-described embodiment as can be seen that the voltage transmitter 5 can realize the amplification to actual voltage signal simultaneously
Or decay；Staff can independently select the circuit mould needed according to the scope where actual voltage signal absolute value
Formula, so that the voltage signal after conversion meets the scope of predetermined reference voltage value, meets the measurement range of measurement apparatus；It is described
Current amplification circuit 9 can be amplified to actual current signal, because the current transducer 8 first believes actual current
Voltage signal number is converted to, and the voltage signal after changing is typically small, so the current transducer 8 only needs to the electric current
Amplifying circuit 9 can meet the conversion requirements to actual current signal.
In use, staff virtual voltage or current signal are sent to by the input interface 1 to be measured it is described
The interface 3 to be measured that compares is compared, according to comparative result select the voltage amplifier circuit 6, the voltage attenuation circuit 7 or
The current amplification circuit 9；The transmitter 2 is changed；Voltage signal after conversion to be measured compares interface 3 by described
It is compared, if meeting the predetermined reference voltage value, the voltage signal after conversion is passed through with predetermined reference voltage value
The output interface to be measured 4 is exported；If not meeting the predetermined reference voltage value, the transmitter 2 is retransmitted to
Changed, untill meeting the predetermined reference voltage value, then passed through the voltage signal after conversion described to be measured
Output interface 4 is exported.A kind of voltage and current conversion equipment of mesh grounding impedance measurement described in the present embodiment can solve the problem that
The problem of automatic conversioning broad of mesh grounding testing impedance voltage and current.
Alternatively, the resistance for the 5th resistance 91 that the present embodiment is provided is 0.1 Ω.
Further, with reference to Fig. 5, the voltage attenuation circuit 7 includes：First switch 71, the first relay 72, second after
Electrical equipment 73, the 3rd relay 74, the 4th relay 75, first resistor 76, second resistance 77, the resistance of 3rd resistor 78 and the 4th
79；
The output end to be measured for comparing interface 3 respectively with the first switch 71 and the output interface to be measured 4
Connection；
The first resistor 76, the second resistance 77, the 3rd resistor 78 are composed in series with the 4th resistance 79
Series connection main line；
First relay 72, second relay 73, the 3rd relay 74 and the 4th relay 75
Composition parallel branch parallel with one another；
One end of second relay 73 is connected with the output end of the first resistor 76, second relay 73
The other end is connected with the input to be measured for being compared interface 3；
One end of 3rd relay 74 is connected with the output end of the second resistance 77, the 3rd relay 74
The other end is connected with the input to be measured for being compared interface 3；
One end of 4th relay 75 is connected with the output end of the 3rd resistor 78, the 4th relay 75
The other end is connected with the input to be measured for being compared interface 3.
From above-described embodiment as can be seen that actual voltage signal by it is described it is to be measured compare interface 3 with it is set in advance
Reference voltage level compares, and the actual voltage signal that will be greater than reference voltage level is sent to the first switch 71, and described first opens
Close 71 and be connected to the voltage attenuation circuit 7.The decay gear of the voltage attenuation circuit 7 has four kinds：Close the described 4th after
Electrical equipment 75, disconnects first relay 72, second relay 73 and the 3rd relay 74, actual voltage signal warp
Cross after the first resistor 76, the second resistance 77, the 3rd resistor 78 and the 4th relay 75 is to described to be measured
Amount compares interface 3, if the voltage signal virtual value after decay is bigger than reference voltage level set in advance, the ratio to be measured
High level is exported compared with interface 3, illustrates that actual voltage signal exceedes the conversion range of this experimental provision, actual voltage signal needs pre-
First inputted again into the input interface 1 to be measured by voltage transformer reduction, if the voltage signal virtual value after decay is than pre-
The reference voltage level first set is small, then the interface 3 to be measured that compares exports low level, illustrates that actual voltage signal decayed
Degree, should again be decayed using low-grade location, if the voltage signal virtual value after decay meets reference voltage level model set in advance
Enclose, then the voltage signal after decaying is exported by the output interface 4 to be measured；The 3rd relay 74 is closed, is disconnected described
First relay 72, second relay 73 and the 4th relay 75, actual voltage signal pass through the first resistor
76th, the relay 74 of second resistance 77 and the 3rd to it is described it is to be measured compare interface 3, if decay after voltage signal virtual value ratio
Reference voltage level set in advance is big, then the interface 3 to be measured that compares exports high level, illustrates actual voltage signal decay not
Foot, should take high tap position to decay again, if the voltage signal virtual value after decay is smaller than reference voltage level set in advance,
The interface 3 to be measured that compares exports low level, illustrates actual voltage signal overdamping, should again be decayed using low-grade location,
If the voltage signal virtual value after decay meets reference voltage level scope set in advance, the voltage signal after decay is by institute
Output interface 4 to be measured is stated to export；Second relay 73 is closed, first relay 72, the 3rd relay is disconnected
Device 74 and the 4th relay 75, actual voltage signal is by the first resistor 76 and second relay 73 to described
It is to be measured to compare interface 3, it is described to be measured if the voltage signal virtual value after decay is bigger than reference voltage level set in advance
Amount compares the output high level of interface 3, illustrates that actual voltage signal decay is not enough, high tap position should be taken to decay again, if decay
Voltage signal virtual value afterwards is smaller than reference voltage level set in advance, then the interface 3 to be measured that compares exports low level, says
Bright actual voltage signal overdamping, should again be decayed using low-grade location, if the voltage signal virtual value after decay meets pre-
The reference voltage level scope first set, the then voltage signal after decaying is exported by the output interface 4 to be measured；Close described
One relay 72, disconnects second relay 73, the 3rd relay 74 and the 4th relay 75, virtual voltage letter
Number process first relay 72 to it is described it is to be measured compare interface 3, if the voltage signal virtual value after decay is than advance
The reference voltage level of setting is big, then the interface 3 to be measured that compares exports high level, illustrates that actual voltage signal decay is not enough,
High tap position should be taken to decay again, if the voltage signal virtual value after decay is smaller than reference voltage level set in advance, institute
State the interface 3 to be measured that compares and export low level, illustrate actual voltage signal overdamping, should again be decayed using low-grade location, such as
Voltage signal virtual value after fruit decays meets reference voltage level scope set in advance, then the voltage signal after decaying is by described
Output interface 4 to be measured is exported.The conversion equipment acquiescence that the present embodiment is provided is by actual voltage signal from highest decays gear
Start decay, route choosing has logicality, will not produce unnecessary attenuation step, needed for accurately actual voltage signal is decayed to
While range of voltage values, artificial selection and operation are saved.
Alternatively, the present embodiment passes through the decay that sets first resistor, second resistance, the resistance of 3rd resistor to provide shelves
Position range of choice is 1,0.1,0.01 and 0.001 four kind, and reference voltage level scope set in advance is -5V~5V.
Further, with reference to Fig. 5, the voltage amplifier circuit 6 includes：First switch 71, second switch the 61, the 3rd are switched
62nd, the 5th relay 63, the 6th relay 64, the 7th relay 65, the first amplifier 66, the second amplifier 67 and the 3rd amplification
Device 68；
The output end to be measured for comparing interface 3 respectively with the first switch 71 and the output interface to be measured 4
Connection；
First amplifier 66, second amplifier 67, the 3rd amplifier 68, the second switch 61 and institute
State the 3rd switch 62 and be composed in series series connection main line；
5th relay 63, the 6th relay 64 and the 7th relay 65 composition parallel with one another branch in parallel
Road；
One end of 5th relay 63 is connected with the output end of first amplifier 66, the 5th relay 63
The other end and it is described it is to be measured compared interface 3 input connect；
One end of 6th relay 64 is connected with the output end of second amplifier 67, the 6th relay 64
The other end and it is described it is to be measured compared interface 3 input connect；
One end of 7th relay 65 is connected with the output end of the 3rd amplifier 68, the 7th relay 65
The other end and it is described it is to be measured compared interface 3 input connect.
From above-described embodiment as can be seen that actual voltage signal by it is described it is to be measured compare interface 3 with it is set in advance
Reference voltage level compares, and the actual voltage signal less than reference voltage level is sent into the first switch 71, and described first opens
Close 71 and be connected to the voltage amplifier circuit 6.The amplification gear of the voltage amplifier circuit 6 has four kinds：Close the described 5th after
Electrical equipment 63, disconnects the 6th relay 64, the 7th relay 65, the second switch 61 and the 3rd switch 62,
Actual voltage signal by first amplifier 66 and the 5th relay 63 to it is described it is to be measured compare interface 3, if
Voltage signal virtual value after amplification is bigger than reference voltage level set in advance, illustrates actual voltage signal overamplification, Ying Cai
Take low-grade location to amplify again, if the voltage signal virtual value after amplification is smaller than reference voltage level set in advance, illustrate actual
Voltage signal amplification is not enough, high tap position should be taken to amplify again, is preset if the voltage signal virtual value after amplification meets
Reference voltage level scope, then amplify after voltage signal exported by the output interface 4 to be measured；Close the 6th relay
Device and the second switch 61, disconnect the 5th relay, the 7th relay and the 3rd switch 62, virtual voltage
Signal to be measured compares interface by first amplifier 66, second amplifier 67 and the 6th relay to described
3, if the voltage signal virtual value after amplification is bigger than reference voltage level set in advance, illustrate that actual voltage signal is amplified
Degree, should take low-grade location to amplify again, if the voltage signal virtual value after amplification is smaller than reference voltage level set in advance, say
Bright actual voltage signal amplification is not enough, high tap position should be taken to amplify again, if the voltage signal virtual value after amplification meets pre-
The reference voltage level scope first set, the then voltage signal after amplifying is exported by the output interface 4 to be measured；Close described
Seven relays 65, the second switch 61 and the 3rd switch 62, disconnect the 5th relay 63 and the 6th relay
Device 64, actual voltage signal is by first amplifier 66, second amplifier 67, the 3rd amplifier 68 and described
7th relay 65 to it is described it is to be measured compare interface 3, if amplification after voltage signal virtual value than reference set in advance
Magnitude of voltage is big, illustrates actual voltage signal overamplification, low-grade location should be taken to amplify again, if the voltage signal after amplification has
Valid value meets reference voltage level scope set in advance, then the voltage signal after amplifying is exported by the output interface 4 to be measured.
The conversion equipment acquiescence that the present embodiment is provided by actual voltage signal since minimum amplification gear amplify, route choosing patrols
Property is collected, unnecessary amplification procedure will not be produced, needed for accurately actual voltage signal is amplified to while range of voltage values, is saved
Artificial selection and operation.
Alternatively, the amplification that the present embodiment is provided by the first amplifier of setting, the second amplifier and the 3rd amplifier
Gear range of choice is 1,10,100 and 1,000 four kind, and reference voltage level scope set in advance is -5V~5V.
Further, with reference to Fig. 6, the current amplification circuit 9 includes：The switch the 903, the 6th of 4th switch the 901, the 5th is opened
Close the 905, the 8th relay 907, the 9th relay 908, the tenth relay 909, the 11st relay 910, the 5th resistance 911,
4th amplifier 902, the 5th amplifier 904 and the 6th amplifier 906；
The output end to be measured for comparing interface 3 switchs 901 and the output interface to be measured 4 with the described 4th respectively
Connection；
4th amplifier 902, the 5th amplifier 904, the 6th amplifier 906, the 5th switch 903
Series connection main line is composed in series with the described 6th switch 905；
9th relay 908, the tenth relay 909 and the composition parallel with one another of the 11st relay 910
Parallel branch；
One end of 9th relay 908 is connected with the output end of the 4th amplifier 902, the 9th relay
908 other end is connected with the input to be measured for being compared interface 3；
One end of tenth relay 909 is connected with the output end of the 5th amplifier 904, the tenth relay
909 other end is connected with the input to be measured for being compared interface 3；
One end of 11st relay 910 is connected with the output end of the 6th amplifier 906, the described 11st after
The other end of electrical equipment 910 is connected with the input to be measured for being compared interface 3.
From above-described embodiment as can be seen that the voltage signal that is converted into of actual current to be measured compares interface 3 by described
Compared with reference voltage level set in advance, the actual voltage signal less than reference voltage level is sent to the 4th switch
901, the 4th switch 901 is closed to the current amplification circuit 9, and the amplification gear of the current amplification circuit 9 has four kinds：
The 8th relay 907 is closed, the 9th relay 908, the tenth relay 909, the 11st relay is disconnected
The switch 905 of the switch of device the 910, the 5th 903 and the 6th, the current signal for being converted to voltage signal passes through the 8th relay 907
To it is described it is to be measured compare interface 3, if the voltage signal virtual value after amplification is bigger than reference voltage level set in advance, explanation
Actual current is excessive, more than conversion equipment range, and by changing the 5th resistance 911 of smaller resistance, actual current is turned
Become smaller voltage, if the voltage signal virtual value after amplification is smaller than reference voltage level set in advance, account for voltage letter
Number amplification is not enough, more high tap position should be taken to amplify again, if the voltage signal virtual value after amplification meets ginseng set in advance
Range of voltage values is examined, then the voltage signal after amplifying is exported by the output interface 4 to be measured；Close the 9th relay
908, disconnect the tenth relay 909, the 11st relay 910, the 5th switch 903 and the 3rd switch
62, actual voltage signal by the 4th amplifier 902 and it is described 6th switch 905 to it is described it is to be measured compare interface 3, such as
Voltage signal virtual value after fruit is amplified is bigger than reference voltage level set in advance, illustrates actual voltage signal overamplification, should
Take low-grade location to amplify again, if the voltage signal virtual value after amplification is smaller than reference voltage level set in advance, illustrate real
Border voltage signal amplification is not enough, high tap position should be taken to amplify again, is set in advance if the voltage signal virtual value after amplification meets
Fixed reference voltage level scope, the then voltage signal after amplifying is exported by the output interface 4 to be measured；Close the described 6th after
Electrical equipment and the 5th switch 903, disconnect the 9th relay 908, the 11st relay 910 and the 6th switch
905, actual voltage signal is by the 4th amplifier 902, the 5th amplifier 904 and the tenth relay 909 to described
It is to be measured to compare interface 3, if the voltage signal virtual value after amplification is bigger than reference voltage level set in advance, illustrate actual electricity
Signal overamplification is pressed, low-grade location should be taken to amplify again, if the voltage signal virtual value after amplification is than ginseng set in advance
Examine magnitude of voltage small, illustrate that actual voltage signal amplification is not enough, high tap position should be taken to amplify again, if the voltage signal after amplification
Virtual value meets reference voltage level scope set in advance, then the voltage signal after amplifying is defeated by the output interface 4 to be measured
Go out；The 11st relay 910, the switch 905 of the 5th switch 903 and the 6th are closed, the 9th relay 908 is disconnected
With the tenth relay 909, actual voltage signal is by the 4th amplifier 902, the 5th amplifier 904, described
6th amplifier 906 and the 11st relay 910 to it is described it is to be measured compare interface 3, if the voltage signal after amplification
Virtual value is bigger than reference voltage level set in advance, illustrates actual voltage signal overamplification, low-grade location should be taken to amplify again,
If the voltage signal virtual value after amplification meets reference voltage level scope set in advance, the voltage signal after amplification is by institute
Output interface 4 to be measured is stated to export.The conversion equipment acquiescence that the present embodiment is provided is by actual voltage signal from minimum amplification gear
Rise and start amplification, route choosing has logicality, will not produce unnecessary amplification procedure, and actual voltage signal accurately is amplified into institute
While needing range of voltage values, artificial selection and operation are saved.
Alternatively, the amplification gear range of choice that the present embodiment is provided is 1,10,100 and 1,000 four kind, set in advance
Reference voltage level scope is -5V~5V.
A kind of voltage and current conversion of the mesh grounding impedance measurement provided from above technical scheme, the present embodiment
Device, including：Input interface 1 to be measured, transmitter 2 and output interface to be measured 4；The input interface to be measured 1 includes：Electricity
Press input interface 11 and electric current input interface 12；The transmitter 2 includes：It is to be measured to compare interface 3, voltage transmitter 5 and electricity
Flow transmitter 8；The voltage transmitter 5 includes：Voltage amplifier circuit 6 and voltage attenuation circuit 7；The current transducer 8 is wrapped
Include：The resistance 91 of current amplification circuit 9 and the 5th；The output end of the control source interface 11 is defeated with the voltage transmitter 5
Enter end connection；The output end of the electric current input interface 12 is connected with the input of the current transducer 8；The ratio to be measured
Compared with interface 3 respectively with the voltage amplifier circuit 6, the voltage attenuation circuit 7, the current amplification circuit 9 and described to be measured
Amount output interface 4 is connected；The voltage amplifier circuit 6 is in parallel with the voltage attenuation circuit 7；One end of 5th resistance 91
Connected with the output end of the electric current input interface 12；The other end of 5th resistance 91 is gone here and there with the current amplification circuit 9
Connection.
From above-described embodiment as can be seen that in use, staff virtual voltage or current signal are passed through it is described to be measured
Amount input interface 1 sends the interface 3 to be measured that compares to and is compared, and the voltage amplifier circuit is selected according to comparative result
6th, the voltage attenuation circuit 7 or the current amplification circuit 9；The transmitter 2 is changed；Voltage signal after conversion leads to
The interface 3 to be measured that compares is crossed to be compared with predetermined reference voltage value, will if meeting the predetermined reference voltage value
Voltage signal after conversion is exported by the output interface 4 to be measured；If not meeting the predetermined reference voltage value, weigh
Newly it is sent to the transmitter 2 to be changed, untill meeting the predetermined reference voltage value, then by the voltage after conversion
Signal is exported by the output interface 4 to be measured.The voltage and electricity of a kind of mesh grounding impedance measurement described in the present embodiment
The problem of stream conversion device can solve the problem that the automatic conversioning broad of mesh grounding testing impedance voltage and current.
This conversion equipment and voltage transformer, current transformer, 16 A/D converters, host computer CPU, slave computers are common
Constitute mesh grounding impedance measurement device.Staff is first confirmed whether to use when using mesh grounding impedance measurement device
Voltage transformer (TV) or current transformer (TC), first will be by ground if having used one of which or both of which to use
The voltage data and the voltage and current of current data input mesh grounding impedance measurement that net base impedance measurement device is measured turn
The voltage and current conversion equipment of changing device, voltage data and current data Jing Guo the mesh grounding impedance measurement is converted into symbol
Close preset to reference voltage level numerical value；Then the measurement main interface of mesh grounding impedance measurement device, in edit box
The frequency of interior setting input power, click starts to measure button, and slave computer starts to sample and A/D transformation results are uploaded into twoport
RAM, is read by CPU main frames；Result of calculation button is clicked on, result of calculation is shown in operation interface；Click data save button,
Preserved opening after data session frame, import file name, preserve measurement data；Print result button is clicked on, printer can be meter
Result is calculated to print on paper.
Those skilled in the art will readily occur to this practicality after considering specification and putting into practice utility model disclosed herein
New other embodiments.The application is intended to any modification of the present utility model, purposes or adaptations, these
Modification, purposes or adaptations follow general principle of the present utility model and including undocumented skill of the utility model
Common knowledge or conventional techniques in art field.Description and embodiments be considered only as it is exemplary, it is of the present utility model
True scope and spirit are pointed out by following claim.
It should be appreciated that the accurate knot that the utility model is not limited to be described above and is shown in the drawings
Structure, and various modifications and changes can be being carried out without departing from the scope.Scope of the present utility model only will by appended right
Ask to limit.
Claims (4)
1. a kind of voltage and current conversion equipment of mesh grounding impedance measurement, it is characterised in that including：Input interface to be measured
(1), transmitter (2) and output interface to be measured (4)；
The input interface to be measured (1) includes：Control source interface (11) and electric current input interface (12)；
The transmitter (2) includes：It is to be measured to compare interface (3), voltage transmitter (5) and current transducer (8)；
The voltage transmitter (5) includes：Voltage amplifier circuit (6) and voltage attenuation circuit (7)；
The current transducer (8) includes：Current amplification circuit (9) and the 5th resistance (91)；
The output end of the control source interface (11) is connected with the input of the voltage transmitter (5)；
The output end of the electric current input interface (12) is connected with the input of the current transducer (8)；
It is described it is to be measured compare interface (3) respectively with the voltage amplifier circuit (6), the voltage attenuation circuit (7), the electricity
Current amplifier (9) and the output interface to be measured (4) connection；
The voltage amplifier circuit (6) is in parallel with the voltage attenuation circuit (7)；
Connected with the output end of the electric current input interface (12) one end of 5th resistance (91)；
The other end of 5th resistance (91) is connected with the current amplification circuit (9).
2. a kind of voltage and current conversion equipment of mesh grounding impedance measurement according to claim 1, it is characterised in that
The voltage attenuation circuit (7) includes：First switch (71), the first relay (72), the second relay (73), the 3rd relay
(74), the 4th relay (75), first resistor (76), second resistance (77), 3rd resistor (78) and the 4th resistance (79)；
The output end to be measured for comparing interface (3) respectively with the first switch (71) and the output interface to be measured
(4) connect；
The first resistor (76), the second resistance (77), the 3rd resistor (78) are connected with the 4th resistance (79)
Composition series connection main line；
First relay (72), second relay (73), the 3rd relay (74) and the 4th relay
(75) composition parallel branch parallel with one another；
One end of second relay (73) is connected with the output end of the first resistor (76), second relay (73)
The other end and it is described it is to be measured compared interface (3) input connect；
One end of 3rd relay (74) is connected with the output end of the second resistance (77), the 3rd relay (74)
The other end and it is described it is to be measured compared interface (3) input connect；
One end of 4th relay (75) is connected with the output end of the 3rd resistor (78), the 4th relay (75)
The other end and it is described it is to be measured compared interface (3) input connect.
3. a kind of voltage and current conversion equipment of mesh grounding impedance measurement according to claim 2, it is characterised in that
The voltage amplifier circuit (6) includes：First switch (71), second switch (61), the 3rd switch (62), the 5th relay
(63), the 6th relay (64), the 7th relay (65), the first amplifier (66), the second amplifier (67) and the 3rd amplifier
(68)；
The output end to be measured for comparing interface (3) respectively with the first switch (71) and the output interface to be measured
(4) connect；
First amplifier (66), second amplifier (67), the 3rd amplifier (68), the second switch (61)
Series connection main line is composed in series with the described 3rd switch (62)；
5th relay (63), the 6th relay (64) and the 7th relay (65) composition parallel with one another are in parallel
Branch road；
One end of 5th relay (63) is connected with the output end of first amplifier (66), the 5th relay
(63) the other end is connected with the input to be measured for being compared interface (3)；
One end of 6th relay (64) is connected with the output end of second amplifier (67), the 6th relay
(64) the other end is connected with the input to be measured for being compared interface (3)；
One end of 7th relay (65) is connected with the output end of the 3rd amplifier (68), the 7th relay
(65) the other end is connected with the input to be measured for being compared interface (3).
4. a kind of voltage and current conversion equipment of mesh grounding impedance measurement according to claim 3, it is characterised in that
The current amplification circuit (9) includes：4th switch (901), the 5th switch (903), the 6th switch (905), the 8th relay
(907), the 9th relay (908), the tenth relay (909), the 11st relay (910), the 5th resistance (911), the 4th are put
Big device (902), the 5th amplifier (904) and the 6th amplifier (906)；
The output end to be measured for comparing interface (3) switchs (901) and the output interface to be measured with the described 4th respectively
(4) connect；
4th amplifier (902), the 5th amplifier (904), the 6th amplifier (906), the 5th switch
(903) and it is described 6th switch (905) be composed in series series connection main line；
9th relay (908), the tenth relay (909) and parallel with one another group of the 11st relay (910)
Into parallel branch；
One end of 9th relay (908) is connected with the output end of the 4th amplifier (902), the 9th relay
(908) the other end is connected with the input to be measured for being compared interface (3)；
One end of tenth relay (909) is connected with the output end of the 5th amplifier (904), the tenth relay
(909) the other end is connected with the input to be measured for being compared interface (3)；
One end of 11st relay (910) is connected with the output end of the 6th amplifier (906), the described 11st after
The other end of electrical equipment (910) is connected with the input to be measured for being compared interface (3).
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| CN201720124113.1U CN206411193U (en) | 2017-02-10 | 2017-02-10 | A kind of voltage and current conversion equipment of mesh grounding impedance measurement |
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|---|---|---|---|
| CN201720124113.1U CN206411193U (en) | 2017-02-10 | 2017-02-10 | A kind of voltage and current conversion equipment of mesh grounding impedance measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988089A (en) * | 2019-12-16 | 2020-04-10 | 江西农业大学 | Wide-range digital electrochemical analysis device and detection method |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988089A (en) * | 2019-12-16 | 2020-04-10 | 江西农业大学 | Wide-range digital electrochemical analysis device and detection method |
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Effective date of registration: 20210416 Address after: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee after: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Address before: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee before: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Patentee before: WUHAN University |