CN208921826U - A kind of multi-thread core insulation automatic tester and system - Google Patents
A kind of multi-thread core insulation automatic tester and system Download PDFInfo
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- CN208921826U CN208921826U CN201821477419.6U CN201821477419U CN208921826U CN 208921826 U CN208921826 U CN 208921826U CN 201821477419 U CN201821477419 U CN 201821477419U CN 208921826 U CN208921826 U CN 208921826U
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Abstract
This application provides a kind of multi-thread core insulation automatic tester and systems, including input-switching circuit, measurement sample circuit, analog to digital conversion circuit and processing unit, the input-switching circuit is electrically connected with the measurement sample circuit, the measurement sample circuit is electrically connected with analog-digital conversion circuit as described, and the processing unit is electrically connected with input-switching circuit, measurement sample circuit and analog to digital conversion circuit respectively.By the multi-thread core insulation automatic tester of design workload greatly reduces for staff, and provide safety guarantee so that the insulation resistance of multi-thread chipware can automatically detect and the core detected is not in omission phenomenon in the application.
Description
Technical field
This application involves fields such as power plant, substations, a kind of multi-thread core insulation automatic tester and system are related generally to.
Background technique
If the insulation of substation secondary cable core is unsatisfactory for requiring, current sample accuracy will affect, even make when serious
Lead to protection misoperation extremely at control loop." south electric network relay protection examination regulation " requirement, new mounting device screen cabinet connect
Must be measured with 1000V megameter before line each circuit (core) over the ground with each circuit (core) mutual insulation resistance, and its resistance value
It should be greater than 10M Ω.
And during site operation, relay protection personnel are difficult to realize station by whole process and check and accept, and the cruelty during cable laying is dragged
Hidden danger will be brought to the safe operation of transformer equipment with the fraud of construction personnel's insulation measurement data by dragging, in recent years, due to cable
Insulation Problems and caused by electric power safety accident happen occasionally.
Utility model content
The application's is designed to provide a kind of multi-thread core insulation automatic tester and system, effectively solves to survey for solving
Measure core insulation resistance workload it is huge and easily mistakes and omissions the problem of.
To achieve the goals above, it is as follows that this application provides following technical schemes:
First aspect: this application provides a kind of multi-thread core insulation automatic tester, the multi-thread core insulation detects automatically
Instrument includes input-switching circuit, measurement sample circuit, analog to digital conversion circuit and processing unit, the input-switching circuit and institute
Measurement sample circuit electrical connection is stated, the measurement sample circuit is electrically connected with analog-digital conversion circuit as described, the processing unit point
It is not electrically connected with input-switching circuit, measurement sample circuit and analog to digital conversion circuit；
The input-switching circuit, for cable connection column to be accessed the measurement sample circuit；
The measurement sample circuit, for measuring voltage signal and current signal between core and/or between core and ground,
And analog-digital conversion circuit as described is sent by the voltage signal of measurement and the current signal；
Analog-digital conversion circuit as described, for voltage signal based on the received and current signal be converted into voltage digital signal with
And current digital signal, and it is sent to processing unit；
The processing unit, the voltage digital signal and current digital signal meter sent by analog-digital conversion circuit as described
Calculate insulation resistance.
The multi-thread core insulation automatic tester of above scheme design, so that the insulation resistance of multi-thread chipware can automatically detect
And the core of detection is not in omission phenomenon, workload greatly reduces for staff, and provide safety guarantee.
In the optional implementation of first aspect, the input-switching circuit include the first triode, the second triode,
The emitter of first relay and the second relay, first triode is connect with ground terminal, first triode
Base stage is connect with the processing unit, and the collector of first triode is connect with one end of the first relay coil, described
The other end of first relay coil connects to power supply, and the common end of first relay is connect with cable connection column, described
The normally closed node of first relay is connect with one end of the measurement sample circuit；The emitter of second triode and ground connection
End connection, the base stage of second triode connect with the processing unit, the collector of second triode and second after
One end of electric apparatus coil connects, and the other end of second relay coil connects to power supply, second relay it is public
End is connect with cable connection column, and the normally closed node of second relay is connect with the other end of the measurement sample circuit；
First triode and the second triode are after receiving the electric signal that the processing unit is sent, the triode
Conducting, and then there is electric current to flow through in first relay and the coil of the second relay, make the normally closed contact of the relay
It is closed with the common end of the relay.
The automatic tester of above scheme design, input-switching circuit ensure that multi-thread core access automonitor and carry out
The switching of input.
In the optional embodiment of first aspect, the input-switching circuit further includes first resistor and second resistance,
The first resistor connects the base stage of the processing unit Yu first triode, and it is single that the second resistance connects the processing
First base stage with second triode, the first resistor and second resistance are used to limit each of the input-switching circuit
Road electric current.
The multi-thread core insulation automatic tester of above scheme design, first resistor and second resistance in input-switching circuit
It runs with enabling input-switching circuit accurate stable.
In the optional embodiment of first aspect, the input-switching circuit further includes 3rd resistor and the 4th resistance,
Described 3rd resistor one end connects the first resistor close to one end of first triode, the 3rd resistor other end with
Ground terminal is connected；Described 4th resistance one end connects the second resistance close to one end of second triode, and the described 4th
The resistance other end is connected with ground terminal, and the 3rd resistor and the 4th resistance are used to not receive what the processing unit was sent
When electric signal, end first triode and the second triode.
The multi-thread core insulation automatic tester of above scheme design, 3rd resistor and the 4th resistance make the first triode with
And second triode cut-off, guarantee receive processing unit transmission signal when just conducting.
In the optional embodiment of first aspect, the input-switching circuit further includes first diode and the two or two pole
The anode of pipe, the first diode is connect with the collector of first triode, the cathode of the first diode and institute
The coil for stating the first relay is connected far from one end of first triode；The anode and described second of second diode
The collector of triode connects, and the coil of the cathode of second diode and second relay is far from the two or three pole
One end of pipe connects, and the first diode and the second diode are for protecting the input-switching circuit.
The multi-thread core insulation automatic tester of above scheme design, first diode and the input of the second diode protection switch
Circuit.
In the optional embodiment of first aspect, the measurement sample circuit includes third transistor, step-up transformer
And operational amplifier, the third transistor emitter are connect with ground terminal, the base stage of the third transistor and the place
Unit connection is managed, the collector of the third transistor is connect with one end of the step-up transformer low-voltage coil, the boosting
The other end of low voltage winding in transformers connects to power supply, step-up transformer high-tension coil one end and first relay
Normally closed node side connection, the normally closed node side of second relay is connect with the input negative terminal of the operational amplifier, described
The step-up transformer high-tension coil other end is connect with the input anode of the operational amplifier, the step-up transformer high-tension coil
The output end of one end and the operational amplifier for connecting with operational amplifier input negative terminal is electric with the analog-to-digital conversion respectively
Road connection.
The multi-thread core insulation automatic tester of above scheme design, measurement sample circuit ensure that the signal between core is accurate
Analog to digital conversion circuit is passed to be calculated.
In the optional embodiment of first aspect, the measurement sample circuit further includes voltage doubling rectifing circuit, and described times
Voltage rectifier includes first capacitor, the second capacitor, third diode and the 4th diode, the first capacitor both ends difference
The input negative terminal of step-up transformer high-tension coil one end and operational amplifier is connected, second capacitor both ends are separately connected boosting
Transformer high-voltage coil both ends, third diode both ends are separately connected step-up transformer high-tension coil both ends, described
The anode of 4th diode is connected with the cathode of third diode, one end phase of the cathode and the second capacitor of the 4th diode
Even.
The multi-thread core insulation automatic tester of above scheme design, being obtained using voltage doubling rectifing circuit can measure insulation resistance
High-voltage dc voltage.
In the optional embodiment of first aspect, the measurement sample circuit further includes bleeder circuit, the partial pressure electricity
Road includes the 5th resistance and the 6th resistance, and the 5th resistance is connected with the 6th resistance, the 5th resistance other end and the 4th
The cathode of diode is connected, and the other end of the 6th resistance is connected with the input anode of the operational amplifier.
The multi-thread core insulation automatic tester of above scheme design can get the electricity of tested insulation resistance using bleeder circuit
Press signal.
In the optional embodiment of first aspect, first triode, the second triode and third transistor are all
For npn type triode.
Second aspect: this application provides a kind of multi-thread core insulation automatic checkout systems, and the system comprises inputs to switch
Device, measurement sampler, analog-digital commutator and processing unit, the input switching device are electrically connected with measurement sampler
It connects, the measurement sampler is electrically connected with analog-digital commutator, and the processing unit takes with input switching device, measurement respectively
Sampling device and analog-digital commutator electrical connection.
The input switching device, for making cable connection column access the measurement sampler；
The measurement sampler, for measuring voltage signal and current signal between core and/or between core and ground,
And send it to the analog-digital commutator；
The analog-digital commutator, for by received voltage signal and current signal be converted into voltage digital signal and
Current digital signal, and it is sent to processing unit；
The processing unit, the voltage digital signal sent by the analog-digital commutator and current digital signal meter
Calculate insulation resistance.
The multi-thread core insulation automatic checkout system of above scheme design, enables the insulation resistance of multi-thread chipware to examine automatically
It surveys and the core of detection is not in omission phenomenon, workload greatly reduces for staff, and provide safe guarantor
Barrier.
The beneficial effect of the application includes: the multi-thread core insulation automatic tester that the application obtains by above-mentioned design, is made
Much the insulation resistance of core part can automatically detect and the core detected is not in omission phenomenon, greatly for staff
Workload is reduced, and provides safety guarantee.
Other feature and advantage of the application will be illustrated in subsequent specification, also, partly be become from specification
It is clear that being understood and implementing the embodiment of the present application.The purpose of the application and other advantages can be by written
Specifically noted structure is achieved and obtained in specification, claims and attached drawing.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the application
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.By the way that shown in attached drawing, above and other purpose, the feature and advantage of the application will be more clear.In whole
Identical appended drawing reference indicates identical part in attached drawing.Attached drawing, emphasis deliberately are not drawn by actual size equal proportion scaling
It is that the purport of the application is shown.
Fig. 1 is the multi-thread core insulation automatic tester structure chart that the application first embodiment provides；
Fig. 2 is the input-switching circuit physical circuit figure that the application first embodiment provides；
Fig. 3 is the measurement sample circuit physical circuit figure that the application first embodiment provides.
Fig. 4 is the multi-thread core insulation automatic checkout system structure chart that the application second embodiment provides.
Icon: 110- processing unit；120- input-switching circuit；The first triode of 1201-；The second triode of 1202-；
The first relay of 1203-；The second relay of 1204-；1205- first resistor；1206- second resistance；1207- 3rd resistor；
The 4th resistance of 1208-；1209- first diode；The second diode of 1210-；130- measures sample circuit；The three or three pole 1301-
Pipe；1302- step-up transformer；1303- operational amplifier；1304- first capacitor；The second capacitor of 1305-；The three or two pole 1306-
Pipe；The 4th diode of 1307-；The 5th resistance of 1308-；The 6th resistance of 1309-；140- analog to digital conversion circuit；150- input is cut
Changing device；160- measures sampler；170- analog-digital commutator；180- processing unit.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application embodiment clearer, implement below in conjunction with the application
The technical solution in the application embodiment is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is a part of embodiment of the application, rather than whole embodiments.Based on the embodiment in the application, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the application
The range of protection.Therefore, the detailed description of the presently filed embodiment provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present application of protection is sought, but is merely representative of the selected embodiment of the application.Based on the embodiment in the application,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Apply for the range of protection.
In the description of the present application, it is to be understood that term " center ", " length ", " width ", " thickness ", "upper",
The orientation or positional relationship of the instructions such as "lower", "front", "rear", "left", "right", "inner", "outside" is orientation based on the figure
Or positional relationship, it is merely for convenience of description the application and simplifies description, rather than the equipment or element of indication or suggestion meaning
It must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relatively important
Property or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can be expressed
Or implicitly include one or more of the features.In the description of the present application, the meaning of " plurality " is two or two
More than, unless otherwise specifically defined.
In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be direct phase
Even, can also indirectly connected through an intermediary, the interaction that can be connection or two elements inside two elements is closed
System.For the ordinary skill in the art, above-mentioned term in this application specific can be understood as the case may be
Meaning.
In this application unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
First embodiment
As shown in Figure 1, the application provides a kind of multi-thread core insulation automatic tester, comprising:
Processing unit 110, input-switching circuit 120, measurement sample circuit 130 and analog to digital conversion circuit 140, input is cut
It changes circuit 120 to be electrically connected with measurement sample circuit 130, measurement sample circuit 130 is electrically connected with analog to digital conversion circuit 140, is handled
Unit 110 is electrically connected with input-switching circuit 120, measurement sample circuit 130 and analog to digital conversion circuit 140 respectively；Input is cut
Circuit 120 is changed, for making cable connection column access measurement sample circuit 130；Measurement sample circuit 130 is used to measure between core
And/or voltage signal and current signal between core and ground, and send it to analog to digital conversion circuit 140；Analog-to-digital conversion electricity
Road 140 is used to received voltage signal and current signal insulation resistance is calculated, and sends it to processing unit 110；
Processing unit 110 is for controlling input-switching circuit 120, measurement sample circuit 130 and analog to digital conversion circuit 140.
The scheme of above-mentioned design, specifically, cable connection column accesses input-switching circuit by using spring clamp, at this time
Processing unit 110 sends control signal and carries out input switching by I/O port control input-switching circuit 120, inputs switching table
Show, processing unit can be controlled input-switching circuit switching by control signal and access different cores, and be accessed measurement control
Circuit 130 processed；Processing unit 110 sends a signal to circuit of measurement and control 130 immediately, and circuit of measurement and control obtains between multi-thread core
Voltage signal and circuit signal, and send it to analog to digital conversion circuit 140；Processing unit 110 sends control signal immediately
To analog to digital conversion circuit 140, analog to digital conversion circuit 140 is calculated using received voltage signal and current signal between multi-thread core
Insulation resistance.
The scheme of above-mentioned design, so that the insulation resistance of multi-thread chipware can automatically detect and the core detected is not in
Phenomenon is omitted, workload greatly reduces for staff, and provide safety guarantee.
In the application alternative embodiment, input-switching circuit includes the first triode 1201, the second triode 1202, the
One relay 1203 and the second relay 1204, the emitter of the first triode 1201 are connect with ground terminal, the first triode
1201 base stage is connect with processing unit 110, one end of 1203 coil of collector and the first relay of the first triode 1201
Connection, the other end of 1203 coil of the first relay connect to power supply, the common end of the first relay 1203 and cable connection column
The normally closed node of connection, the first relay 1203 is connect with the first end of measurement sample circuit 130；The hair of second triode 1202
Emitter-base bandgap grading is connect with ground terminal, and the base stage of the second triode 1202 is connect with processing unit 110, the collector of the second triode 1202
It is connect with one end of 1204 coil of the second relay, the other end of 1204 coil of the second relay connects to power supply, the second relay
The common end of device 1204 is connect with cable connection column, and the of the normally closed node of the second relay 1204 and measurement sample circuit 130
The connection of two ends.
Wherein, it should be noted that as shown in Fig. 2, its end L and the end E it is practical just for the first end of measurement sample circuit with
Second end.
It specifically, two control signals that processing unit 110 is sent are respectively ZJL1 and ZJE1, and is all high level,
After being driven respectively by the first triode 1201 and the amplification of the second triode 1202, electric current flows through the first relay 1203 and the
The coil of two relays 1204, so that the first relay 1203 and 1204 normally closed contact of the second relay closure, so that by core
It is respectively connected to the end L and the end E of measurement sample circuit.
In the application alternative embodiment, 120 physical circuit of input-switching circuit is as shown in Figure 2.
Input-switching circuit 120 further includes first resistor 1205 and second resistance 1206,1205 connection of first resistor processing
The base stage of unit 110 and the first triode 1201, second resistance 1206 connect the base stage of processing unit and the second triode 1202,
First resistor 1205 and second resistance 1206 are used to limit each branch current of the input-switching circuit.
Optionally, input-switching circuit 120 further includes 3rd resistor 1207 and the 4th resistance 1208,3rd resistor 1,207 1
Close to one end of the first triode 1201,1207 other end of 3rd resistor is connected end connection first resistor 1205 with ground terminal；The
Four resistance, 1208 one end connects second resistance 1206 close to one end of the second triode 1202,1208 other end of the 4th resistance with
Ground terminal is connected, and 3rd resistor 1207 and the 4th resistance 1208 are used for when not receiving the electric signal of the transmission of processing unit 110,
End the first triode 1201 and the second triode 1202.
Optionally, input-switching circuit 120 further includes the 1210, the 1st pole of first diode 1209 and the second diode
The anode of pipe 1209 is connect with the collector of the first triode 1201, the cathode of first diode 1209 and the first relay 1203
Coil far from the first triode 1201 one end connect；The current collection of the anode and the second triode 1202 of second diode 1210
The coil of pole connection, the cathode of the second diode 1210 and the second relay 1204 connects far from one end of the second triode 1202
It connects, first diode 1209 and the second diode 1210 are for protecting the input-switching circuit.
In the application alternative embodiment, measurement 130 physical circuit of sample circuit is as shown in Figure 3.
It measures sample circuit 130 and includes third transistor 1301, step-up transformer 1302 and operational amplifier 1303, the
Three triodes, 1301 emitter is connect with ground terminal, and the base stage of third transistor 1301 is connect with processing unit 110, and the three or three
The collector of pole pipe 1301 is connect with one end of 1302 low-voltage coil of step-up transformer, 1302 low-voltage coil of step-up transformer
The other end connects to power supply, and 1302 high-tension coil one end of step-up transformer is connect with the end L, and the end L is connected with the end E, and the end E is put with operation
The input negative terminal connection of big device 1303, the input anode of the step-up transformer 1302 high-tension coil other end and operational amplifier 1303
Connection, one end and analog to digital conversion circuit that 1302 high-tension coil of step-up transformer is connect with 1303 input negative terminal of operational amplifier
140 connections (I is expressed as in figure), the output end of operational amplifier 1303 is connect with analog to digital conversion circuit 140 (to be expressed as in figure
U)。
Optionally, measurement sample circuit 130 further includes voltage doubling rectifing circuit, and voltage multiplying rectifier electric current includes first capacitor
1304, the second capacitor 1305, third diode 1306 and the 4th diode 1307,1304 both ends of first capacitor are separately connected liter
The input negative terminal of pressure transformer 1302 high-tension coil one end and operational amplifier 1303,1305 both ends of the second capacitor are separately connected
1302 high-tension coil both ends of step-up transformer；1306 both ends of third diode are separately connected 1302 high-tension coil two of step-up transformer
The anode at end, the 4th diode 1307 is connected with the cathode of third diode 1306, the cathode and second of the 4th diode 1307
One end of capacitor 1305 is connected.
Optionally, measurement sample circuit 130 further includes bleeder circuit, and bleeder circuit includes the 5th resistance 1308 and the 6th
Resistance 1309, the 5th resistance 1308 are connected with the 6th resistance 1309,1308 other end of the 5th resistance and the 4th diode 1307
Cathode is connected, and the other end of the 6th resistance 1309 is connected with the input anode of operational amplifier 1303.
Specifically, processing unit 110 can generate frequency and the adjustable PWM waveform of duty ratio, and sends it to measurement and take
Sample circuit enters step-up transformer 1302 after third transistor 1301 amplifies electric current, is boosted by step-up transformer 1302
Later, it recycles voltage doubling rectifing circuit to obtain the high-voltage dc voltage for the measurement insulation resistance that can be set, this voltage is accessed
The both ends L and E for needing to test insulation resistance, can get voltage signal using bleeder circuit, can using operational amplifier 1303
The current signal for flowing through tested insulation resistance is obtained, voltage signal and current signal are inputed into analog to digital conversion circuit.
Optionally, multicore automatic tester further includes the display and printer connecting with processing unit 110, every time absolutely
Edge measures automatic output test result and shows over the display, and generates report and print, and has been effectively prevented measurement data
Fraud, and can observe data whether in zone of reasonableness constantly.
Second embodiment
As shown in figure 4, the present embodiment provides a kind of multi-thread core insulation automatic checkout system, including input switching device 150,
Measure sampler 160, analog-digital commutator 170 and processing unit 180, input switching device 150 and measurement sampler
160 electrical connections, measurement sampler 160 are electrically connected with analog-digital commutator 170, and processing unit 180 is filled with input switching respectively
It sets 150, measurement sampler 160 and analog-digital commutator 170 is electrically connected；Switching device 150 is inputted, for making cable connection
Column access measurement sampler 160；Sampler 160 is measured, for measuring the voltage letter between core and/or between core and ground
Number and current signal, and be transmitted to analog-digital commutator 170；Analog-digital commutator 170 is used for received voltage signal
It is converted into voltage digital signal and current digital signal with current signal, and is sent to processing unit 180；Processing unit 180,
The voltage digital signal and current digital signal sent by the analog-digital commutator calculates insulation resistance.
The multi-thread core insulation automatic checkout system of above-mentioned design so that the insulation resistance of multi-thread chipware can automatically detect and
The core of detection is not in omission phenomenon, workload greatly reduces for staff, and provide safety guarantee.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application shall be subject to the protection scope of the claim.
Claims (10)
1. a kind of multi-thread core insulation automatic tester, which is characterized in that the multi-thread core insulation automatic tester includes that input is cut
Change circuit, measurement sample circuit, analog to digital conversion circuit and processing unit, the input-switching circuit and measurement sampling electricity
Road electrical connection, the measurement sample circuit are electrically connected with analog-digital conversion circuit as described, and the processing unit switches with input respectively
Circuit, measurement sample circuit and analog to digital conversion circuit electrical connection；
The input-switching circuit, for cable connection column to be accessed the measurement sample circuit；
The measurement sample circuit, for measuring voltage signal and current signal between core and/or between core and ground, and will
The voltage signal and the current signal of measurement are sent to analog-digital conversion circuit as described；
Analog-digital conversion circuit as described is converted into voltage digital signal and electricity for voltage signal based on the received and current signal
Streaming digital signal, and it is sent to processing unit；
The processing unit, the voltage digital signal and current digital signal sent by analog-digital conversion circuit as described calculate exhausted
Edge resistance.
2. multi-thread core insulation automatic tester according to claim 1, which is characterized in that the input-switching circuit includes the
One triode, the second triode, the first relay and the second relay, the emitter and ground terminal of first triode connect
It connects, the base stage of first triode is connect with the processing unit, the collector and the first relay of first triode
One end of coil connects, and the other end of first relay coil connects to power supply, the common end of first relay with
The connection of cable connection column, the normally closed node of first relay are connect with one end of the measurement sample circuit；Described second
The emitter of triode is connect with ground terminal, and the base stage of second triode is connect with the processing unit, and the described 2nd 3
The collector of pole pipe is connect with one end of the second relay coil, and the other end of second relay coil connects to power supply,
The common end of second relay is connect with cable connection column, and the normally closed node of second relay and the measurement sample
The other end of circuit connects；
After receiving the electric signal that the processing unit is sent, the triode is led for first triode and the second triode
It is logical, and then there is electric current to flow through in first relay and the coil of the second relay, make the relay normally closed contact and
The common end of the relay is closed.
3. multi-thread core insulation automatic tester according to claim 2, which is characterized in that the input-switching circuit further includes
First resistor and second resistance, the first resistor connect the base stage of the processing unit Yu first triode, and described
Two resistance connect the base stage of the processing unit Yu second triode, the first resistor and second resistance for limiting institute
State each branch current of input-switching circuit.
4. multi-thread core insulation automatic tester according to claim 3, which is characterized in that the input-switching circuit further includes
3rd resistor and the 4th resistance, described 3rd resistor one end connect the first resistor close to one end of first triode,
The 3rd resistor other end is connected with ground terminal；Described 4th resistance one end connects the second resistance close to the described 2nd 3
One end of pole pipe, the 4th resistance other end are connected with ground terminal, and the 3rd resistor is with the 4th resistance for not receiving
To the processing unit send electric signal when, make first triode and the second triode cut-off.
5. multi-thread core insulation automatic tester according to claim 4, which is characterized in that the input-switching circuit further includes
The anode of first diode and the second diode, the first diode is connect with the collector of first triode, described
The cathode of first diode is connect with the coil of first relay far from one end of first triode；Described 2nd 2
The anode of pole pipe is connect with the collector of second triode, the cathode of second diode and second relay
Coil is connected far from one end of second triode, and the first diode is with the second diode for protecting the input to cut
Change circuit.
6. the multi-thread core insulation automatic tester according to any one of claim 2-5, which is characterized in that the measurement takes
Sample circuit includes third transistor, step-up transformer and operational amplifier, and the third transistor emitter and ground terminal connect
It connects, the base stage of the third transistor is connect with the processing unit, and the collector of the third transistor and the boosting become
One end of depressor low-voltage coil connects, and the other end of the step-up transformer low-voltage coil connects to power supply, the boosting transformation
Device high-tension coil one end is connect with the normally closed node side of first relay, the normally closed node side of second relay and institute
State the input negative terminal connection of operational amplifier, the input of the step-up transformer high-tension coil other end and the operational amplifier
Anode connection, one end and the operation amplifier that the step-up transformer high-tension coil is connect with operational amplifier input negative terminal
The output end of device is connect with analog-digital conversion circuit as described respectively.
7. multi-thread core insulation automatic tester according to claim 6, which is characterized in that the measurement sample circuit further includes
Voltage doubling rectifing circuit, the voltage doubling rectifing circuit include first capacitor, the second capacitor, third diode and the 4th diode,
The first capacitor both ends are separately connected the input negative terminal of step-up transformer high-tension coil one end and operational amplifier, and described second
Capacitor both ends are separately connected step-up transformer high-tension coil both ends, and third diode both ends are separately connected the boosting transformation
The anode at device high-tension coil both ends, the 4th diode is connected with the cathode of third diode, and the 4th diode is born
Pole is connected with one end of the second capacitor.
8. multi-thread core insulation automatic tester according to claim 7, which is characterized in that the measurement sample circuit further includes
Bleeder circuit, the bleeder circuit include the 5th resistance and the 6th resistance, and the 5th resistance connects with the 6th resistance, and described the
The five resistance other ends are connected with the cathode of the 4th diode, the other end of the 6th resistance and the input anode of the operational amplifier
It is connected.
9. multi-thread core insulation automatic tester according to claim 8, which is characterized in that first triode, the two or three
Pole pipe and third transistor are npn type triode.
10. a kind of multi-thread core insulation automatic checkout system, which is characterized in that the system comprises input switching device, measurements to take
Sampling device, analog-digital commutator and central processing unit, the input switching device is electrically connected with measurement sampler, described
Measurement sampler is electrically connected with analog-digital commutator, and the central processing unit is sampled with input switching device, measurement respectively
Device and analog-digital commutator electrical connection；
The input switching device, for making cable connection column access the measurement sampler；
The measurement sampler, for measuring voltage signal and current signal between core and/or between core and ground, and will
It is sent to the analog-digital commutator；
The analog-digital commutator, for converting voltage digital signal and electric current for received voltage signal and current signal
Digital signal, and it is sent to processing unit；
The processing unit, the voltage digital signal sent by the analog-digital commutator and current digital signal calculate exhausted
Edge resistance.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031075A (en) * | 2018-09-10 | 2018-12-18 | 广东电网有限责任公司 | A kind of multi-thread core insulation automatic tester and system |
| CN110376492A (en) * | 2019-07-12 | 2019-10-25 | 中国铁路北京局集团有限公司北京车辆段 | A kind of insulation tester |
-
2018
- 2018-09-10 CN CN201821477419.6U patent/CN208921826U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031075A (en) * | 2018-09-10 | 2018-12-18 | 广东电网有限责任公司 | A kind of multi-thread core insulation automatic tester and system |
| CN110376492A (en) * | 2019-07-12 | 2019-10-25 | 中国铁路北京局集团有限公司北京车辆段 | A kind of insulation tester |
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