CN109541286A - A kind of pick-up current detection method and tester - Google Patents
A kind of pick-up current detection method and tester Download PDFInfo
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- CN109541286A CN109541286A CN201811606037.3A CN201811606037A CN109541286A CN 109541286 A CN109541286 A CN 109541286A CN 201811606037 A CN201811606037 A CN 201811606037A CN 109541286 A CN109541286 A CN 109541286A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The present invention relates to a kind of testers, specifically a kind of pick-up current detection method and tester, including the switching of sample power filtering module, isolating transformer, polarity switching module, sample power output socket, measurement position and ground wire disconnect module, measurement network, measurement network and switching module, the first shielding line, secondary shielding line, instrument power supply filter module, instrument power source, electromagnetic isolation cabin, traffic filter, general-purpose interface, oscilloscope module, sample power supply line, metallic shield cabinet are used alone.Method and instrument of the invention is by the optimization to apparatus structure, and the Touch current tester produced using the theory of electromagnetic shielding, filtering etc. is small by Environmental Noise Influence, it is accurate to stablize；Method and instrument of the invention can bear high test input voltage in short-term, it is ensured that the stability of instrument；Measurement Web vector graphic is flexible, and the sample for being adaptable to different power and environmental requirement uses.
Description
Technical field
The present invention relates to a kind of tester, specifically a kind of pick-up current detection method and tester.
Background technique
All electricity consumption products can all generate human contact's electric current, will lead to the person if pick-up current value is excessive and get an electric shock, is straight
To dead danger.There is the test of human body pick-up current in substantially each security appliance examination criteria, it is desirable that in sample work
The pick-up current situation for making its each position of state measurement is a very important safety test.Multiple product safety standard
The test item is still remained after experienced the update of multiple versions, it is contemplated that in the test item in the future by long-term existence.
In the prior art, what most laboratory was equipped with is that triumph company, the U.S. produces, designs by U.S.'s UL standard
Pointer leakage current table, the Lauren that this indicator type current meter generates in pointer coil by the DC component of tested electric current
Thatch power deflection gauge pointer simultaneously provides reading, it is clear that it can only measure pick-up current average value (direct current).Electronic product has been at present
Switching Power Supply is generallyd use, and human contact's electric current that Switching Power Supply generates is various nonsinusoidal waveforms, this feelings
Under condition, pointer ammeter cannot be measured accurately.
Since measured human contact's electric current is usually very low, it is no more than several milliamperes of zero point to safety standard requirement, letter
It is number faint, and human contact's electric current frequency itself is also very high, along with the electronic product in surrounding enviroment includes laboratory instrument
High power switching power supply used in Switching Power Supply, especially laboratory is widely used in device, so that measured by oscillograph
Human contact's electric current generally entails that ambient noise interferes, and is difficult to judge its peak amplitude or keeps measurement result inaccurate.
Due to insufficient or sample circuit complexity that tester understands test, generation that can be regular is contact
Current measurement network misconnection is on the high pressures such as line voltage, high power line road, so as to cause certain in pick-up current measurement network
A little elements are burnt.In view of the ambiguity of pick-up current value, therefore pick-up current measures burning for certain elements in network
Caused numerical value is not allowed to be difficult to be found in usually test.
Currently on the market there are no the independent contact current measurement network of commercialization and can prevent interference pick-up current survey
Measuring appratus, and laboratory is essentially all to build simple tooling and measuring circuit by engineer, and used circuit and equipment are existed
Together, not only measurement process is unreliable for external connection on testing stand, and all 220V components be all it is exposed, in test operation
There is very big risk；The influence of electromagnetic interference will be will receive and causes test result inaccurate.Therefore the prior art is up for changing
Into and development.
Summary of the invention
The purpose of the present invention is to provide a kind of pick-up current detection method and testers, to solve in above-mentioned background technique
The problem of proposition.
To achieve the above object, the invention provides the following technical scheme:
A kind of Touch current tester, including sample power filtering module, isolating transformer, polarity switching module, sample
Power output socket, measurement position switching and ground wire disconnect module, measurement network, measurement network and switching module, the are used alone
It is one shielding line, secondary shielding line, instrument power supply filter module, instrument power source, electromagnetic isolation cabin, traffic filter, general
Interface, oscilloscope module, sample power supply line, metallic shield cabinet, the sample power filtering module are mounted on metal chassis,
The power supply line powered to sample is entered in metallic shield cabinet by sample power filtering module, sample power output socket peace
On metallic shield cabinet, the sample power filtering module is sequentially connected isolating transformer, polarity switching module and sample
Power output socket, sample power output socket connect sample by sample power supply line, and isolating transformer is also respectively connected with
Measurement position switching and ground wire disconnect module and switching module is used alone in measurement network, and measurement position switching and ground wire disconnect mould
Block is also respectively connected with sample power output socket and measurement network, and measurement network is also connected with measurement network and switching mould is used alone
Block, measurement network also pass through secondary shielding line connection signal filter, and traffic filter is mounted on before general-purpose interface, general to connect
Mouth is BNC connector, is mounted between electromagnetic isolation cabin and metallic shield cabinet inside, and traffic filter passes through general-purpose interface and connects
Oscilloscope module, oscilloscope module also connect instrument power supply filter module, the filtering of instrument power supply by instrument power source
Module is mounted on metal chassis, and the power supply line powered to instrument enters metallic shield by instrument power supply filter module
In electromagnetic isolation cabin in cabinet, the measurement position switching and ground wire disconnect module and measurement network exclusive use switching module
It is also connected on the first shielding line；One or more electromagnetic isolations cabin is equipped in the metallic shield cabinet, with just
Often work when can generate the device of electromagnetic interference, or will lead to the device that metallic shield cabinet conducting continuity is destroyed be placed in every
From in cabin.
As a further solution of the present invention: the sample power filtering module is the corresponding low-pass filter of 400Hz, institute
Stating instrument power supply filter module is the corresponding low-pass filter of 50Hz, and instrument power source is linear transformation electricity of the 220V to low pressure
Source, the oscilloscope module are the oscilloscope module with 10MHz bandwidth, and the metallic shield cabinet, which is one, to be had and lead
The metal box of electric continuity.
As a further solution of the present invention: the sample power filtering module is the corresponding low-pass filter of 400Hz, institute
Stating instrument power supply filter module is the corresponding low-pass filter of 50Hz, and instrument power source is linear transformation electricity of the 220V to low pressure
Source, the oscilloscope module are the oscilloscope module with 10MHz bandwidth, and the metallic shield cabinet, which is one, to be had and lead
The metal box of electric continuity.
As a further solution of the present invention: the isolating transformer is the isolating transformer of 1:1.
As a further solution of the present invention: the measurement network may include 1 or more pick-up current measurement network,
It is selected by stacked switch, it is primary only to connect one of measurement network.
As a further solution of the present invention: the sample power output socket is also placed in an electromagnetic isolation cabin.
As a further solution of the present invention: first shielding line is that double braid adds aluminum foil shielded line, described second
Shielding line is double braid line.
As the present invention further scheme: a kind of detection method of Touch current tester, include the following steps: by
Be arranged outside measuring instrument to the power supply that sample is powered, power supply by after the good voltage of featured configuration of sample, frequency by L, N power supply line
It is connected by sample power filtering module and measuring instrument, and is connect by sample power output socket with sample power supply line, it is real
Power supply now is provided to sample, switches the pole of a sample power supply by polarity switching module in normal condition test process
Property, disconnect a N line as required in simulated failure test process or without disconnecting N line；
Measurement position switching and ground wire disconnect module and keep isolating transformer to sample electricity in normal condition test process
Ground wire is connected between the accessory power outlet of source, while keeping the connection between the core wire in measurement network and the first shielding line, is being simulated
A ground wire is disconnected in fault test process as required, and in measurement network connection to the ground wire of sample power output socket；
Switching module is used alone in measurement network 2 kinds of working conditions as needed, the first is using measuring instrument to sample
Product power supply, measures network at this time and isolating transformer is connected, rather than is connected on the shielded layer of the first shielding line；Second is single
Solely using measurement network, the power supply or measurement point that are detached from tester at this time are two accessible points on sample, measurement network
It is disconnected with isolating transformer, and the connecting line on measurement network is switched on the shielded layer of the first shielding line.
As a further solution of the present invention: the measurement network include resistance R1, resistance RS, resistance RB, capacitor CS and
Capacitor C1, the measurement terminal A for measuring network are separately connected resistance RS and capacitor CS, and it is another that the resistance RS other end is separately connected capacitor CS
One end, resistance RB and resistance R1, the resistance R1 other end connect capacitor C1, the capacitor C1 other end be separately connected the resistance RB other end and
Measure the measurement terminal B of network；The voltage at the both ends the resistance RB is set as U1, and the voltage at the both ends capacitor C1 is set as U2
As further scheme of the invention: the oscilloscope module when in use will be according to selected measurement network
Type the type of shown value is set, display real available value voltage value be set as when selection measures U1, surveyed in selection
It is set as peak value display voltage value when measuring U2, display DC voltage value will be set as when measuring direct current sample.
Compared with prior art, the beneficial effects of the present invention are: method and instrument of the invention passes through to apparatus structure
Optimization, the Touch current tester produced using the theory of electromagnetic shielding, filtering etc. is small by Environmental Noise Influence, it is quasi- to stablize
Really；Method and instrument of the invention can bear high test input voltage in short-term, it is ensured that the stability of instrument；Measure Web vector graphic spirit
Living, the sample for being adaptable to different power and environmental requirement uses.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Touch current tester of the present invention.
Fig. 2 is the circuit diagram that network is measured in Touch current tester of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1~2, in the embodiment of the present invention, a kind of Touch current tester, including sample power filtering module 1,
Isolating transformer 2, polarity switching module 3, sample power output socket 4, measurement position switching and ground wire disconnect module 5, measurement
Switching module 7, the first shielding line 8, secondary shielding line 9, instrument power supply filter module is used alone in network 6, measurement network
10, instrument power source 11, electromagnetic isolation cabin 12, traffic filter 13, general-purpose interface 14, oscilloscope module 15, sample power supply line 17,
Metallic shield cabinet 18, the sample power filtering module 1 are mounted on metal chassis 18, and the power supply line powered to sample passes through
Sample power filtering module 1 enters in metallic shield cabinet 18, and sample power output socket 4 is mounted on metallic shield cabinet 18
On, the sample power filtering module 1 is sequentially connected isolating transformer 2, polarity switching module 3 and sample power output socket 4,
Sample power output socket 4 connects sample 16 by sample power supply line 17, and isolating transformer 2 is also respectively connected with measurement position
Switching and ground wire disconnect module 5 and switching module 7 is used alone in measurement network, and measurement position switching and ground wire disconnect module 5 also
It is separately connected sample power output socket 4 and measurement network 6, measurement network 6 is also connected with measurement network and switching module is used alone
7, measurement network 6 also by 9 connection signal filter 13 of secondary shielding line, traffic filter 13 be mounted on general-purpose interface 14 it
Before, general-purpose interface 14 is BNC connector, is mounted between 18 inside of electromagnetic isolation cabin 12 and metallic shield cabinet, traffic filter
13 connect oscilloscope module 15 by general-purpose interface 14, and oscilloscope module 15 also connects instrument power supply by instrument power source 11
Filter module 10, instrument power supply filter module 10 are mounted on metal chassis 18, and the power supply line powered to instrument passes through instrument
Device power supply filter module 10 enters in the electromagnetic isolation cabin 12 in metallic shield cabinet 18, measurement position switching and
Ground wire disconnects module 5 and measurement network is used alone switching module 7 and is also connected on the first shielding line 8；The metallic shield
One or more electromagnetic isolations cabin 12 is equipped in cabinet 18, having in normal work the device that can generate electromagnetic interference, or
It will lead to the device that 18 conducting continuity of metallic shield cabinet is destroyed to be placed in cofferdam.
In the winding displacement mode of 18 inside conductor of metallic shield cabinet, sample power filtering module 1, isolating transformer 2, polarity
Switching module 3, sample power output socket 4, measurement position switching and ground wire disconnect module 5, measurement network 6, measurement network list
Solely needed using the connecting line between switching module 7, the first shielding line 8 it is short as far as possible, and with the parallel mode abutted mutually or double
The mode of strand is routed, to reduce the spatial area for being included between circuit to the greatest extent.
Sample power filtering module 1 is mounted on metal chassis 18, is the corresponding low-pass filter of 400Hz, is supplied to sample
The power supply line of electricity is entered in metallic shield cabinet 18 by sample power filtering module 1.
Isolating transformer 2 is the isolating transformer of 1:1.It provides a kind of protection method for the electric shock of personnel.
The function of L, N power supply line reversal can be achieved in switch in polarity switching module 3, is also responsible for simulation N line failure
The function of disconnection N line in test.
Sample power output socket 4 is mounted on metallic shield cabinet 18, using nonstandard Universal Socket, is responsible for having
The sample of various countries' plug provides test power supply.
Measurement position switching and ground wire, which disconnect module 5, to be responsible for realizing disconnection isolation transformation in the test that simulation ground wire disconnects
Device 2 arrives the function of ground wire between sample power output socket 4, while the line between measurement network 6 and the first shielding line 8 is broken
It opens, and measurement network 6 is connected on the ground wire of sample power output socket 4.
Measurement network 6 may include 1 or more pick-up current measurement network, be selected by stacked switch, primary
Connect one of measurement network.There is a metal shielding box in the outside of this core component, to carry out in metallic shield cabinet
Secondary shield in 18.The end A of measurement network is connected to measurement position switching and ground wire disconnects module 5, and the end B is connected to measurement net
Switching module 7 is used alone in network, and signal end is connected to secondary shielding line 9.
Switching module 7, which is used alone, in measurement network is responsible in the power supply or measurement point for needing to be detached from tester being on sample
When two accessible points, measurement network can be used alone, to measurement network 6 is disconnected with isolating transformer 2, and measurement net
Connecting line on network 6 is switched on the shielded layer of the first shielding line 8.
First shielding line 8 is that double braid adds aluminum foil shielded line, to reduce the spatial area for being included between circuit to the greatest extent,
And the tightness of shielded layer is kept during the swing.It is responsible for for the input terminal for measuring network being connected to being measured on sample
Point on.Its needed outside measuring instrument with the mode cabling of mode or multiple twin abutted mutually parallel of sample power supply line 17, with to the greatest extent
Amount reduces the spatial area for being included between circuit, reduces the influence of spacing electromagnetic radiation.Its end is drawn in core wire and shielded layer
Banana plug formula terminal can be had in outlet, and equipped with the clip that can be used together with banana insertion terminal.
Secondary shielding line 9 is double braid line, is responsible for measurement network 6 to the connection between general-purpose interface 14, secondary shielding
Traffic filter 13 is installed between line 9 and general-purpose interface 14.Traffic filter 13 is the corresponding low-pass filter of 1MHz.It uses
The effect of shielding line is to be further reduced received electromagnetic interference noise.
Instrument power supply filter module 10 is mounted on metal chassis 18, is the corresponding low-pass filter of 50Hz, is given instrument
The power supply line of device power supply enters the electromagnetic isolation cabin 12 in metallic shield cabinet 18 by instrument power supply filter module 10
It is interior.
Instrument power source 11 is 220V to the linear variable-voltage power supply of low pressure, is mounted in electromagnetic isolation cabin 12, is oscillograph
Module 15 provides the power supply needed for working normally.
Electromagnetic isolation cabin 12 is the gold with conducting continuity individually separated in metallic shield cabinet 18
Belong to cabin, the electromagnetic interference generated during the work time due to information process unit, that is, oscilloscope module 15 it acts as shielding is to survey
Measure the influence of network 6 and all connecting wires.Since oscilloscope module 15 includes display panel, which was being worked normally
Needing to open a display window in journey on cabinet, the conductive connection which will lead to metallic shield cabinet 18 is destroyed, from
And substantially reduce the shield effectiveness of metallic shield cabinet 18.Oscilloscope module 15, which is placed in electromagnetic isolation cabin 12, to be excluded
This influences and keeps the shield effectiveness of metallic shield cabinet 18.
Traffic filter 13 is the corresponding low-pass filter of 1MHz, is mounted on before general-purpose interface 14, is responsible for further
Electromagnetic interference noise received by measurement network 6 and all connecting wires is filtered out, is provided for oscilloscope module 15 purer
Test signal.
General-purpose interface 14 is common BNC or similar connector, is mounted between electromagnetic isolation cabin 12 and cabinet inside.To show
Wave device module 15 or external oscillograph provide test signal.Can be used oscilloscope module 15 as signal in the test method and its
The display interface of waveform, can also external advanced oscillograph as the display interface of signal and its waveform with to measuring signal make into
The analysis and research of one step.
Oscilloscope module 15 is the oscilloscope module with 10MHz bandwidth.It is received after traffic filter 13
Measuring signal, can be shown by built-in function switch or simultaneously measurement network output peak value, D. C. value and real available value
Voltage value.
Metallic shield cabinet 18 is the metal box with conducting continuity, for internal component provide rigid support and
Electromagnetic shielding, while certain insulation being provided to dangerous voltage component and conducting wire.One or more electromagnetic isolation cabins are wherein set
12, the device of electromagnetic interference can be generated having in normal work, or will lead to 18 conducting continuity quilt of metallic shield cabinet
The device of destruction is placed in cofferdam.Metallic shield cabinet 18 can be earth-free, or reinforces the shield effectiveness to electric field
And it is connected to the earth.
The detection method of Touch current tester of the present invention is further elaborated below, the method includes walking as follows
It is rapid: the power supply powered to sample is arranged outside measuring instrument, power supply by after the good voltage of featured configuration of sample, frequency by L, N
Power supply line is connected by sample power filtering module 1 and measuring instrument, and passes through sample power output socket 4 and sample power supply line
17 connections, realize and provide power supply to sample, switch a sample by polarity switching module 3 in normal condition test process and supply
The polarity of power supply disconnects a N line or without disconnecting N line as required in simulated failure test process；
Measurement position switching and ground wire disconnect module 5 and keep isolating transformer 2 to sample in normal condition test process
Ground wire is connected between power output socket 4, while keeping the connection between the core wire in measurement network 6 and the first shielding line 8,
A ground wire is disconnected in simulated failure test process as required, and measurement network 6 is connected to the ground of sample power output socket 4
On line；
Switching module 7, which is used alone, in measurement network has 2 kinds of working conditions as needed, the first is using measuring instrument to sample
Product power supply, measures network 6 at this time and isolating transformer 2 is connected, rather than is connected on the shielded layer of the first shielding line 8；Second
It is single use measurement network 6, the power supply or measurement point that are detached from tester at this time are two accessible points on sample, measurement
Network 6 and isolating transformer 2 disconnect, and the connecting line on measurement network 6 is switched on the shielded layer of the first shielding line 8.
The measurement network 6 includes resistance R1, resistance RS, resistance RB, capacitor CS and capacitor C1, measures the measurement of network 6
Terminal A is separately connected resistance RS and capacitor CS, and the resistance RS other end is separately connected the capacitor CS other end, resistance RB and resistance R1,
The resistance R1 other end connects capacitor C1, and the capacitor C1 other end is separately connected the resistance RB other end and measures the measurement terminal of network 6
B；The voltage at the both ends the resistance RB is set as U1, and the voltage at the both ends capacitor C1 is set as U2.
When in use shown value will be arranged according to the type of selected measurement network in the oscilloscope module 15
Type, selection measure U1 when be set as display real available value voltage value, selection measure U2 when be set as peak value display electricity
Pressure value will be set as display DC voltage value when measuring direct current sample.
Other than outer used first shielding line 8 of the shielding of instrument internal ready made arrangement, winding displacement and machine, surveying
It needs constantly to pay attention to during amount to reduce the area for being included between the first shielding line 8 and sample power supply line/wiring.Sample power supply
Line 17 shortens length as far as possible, for the sample of appliance coupler power supply, then prepares short power supply line by laboratory.
This method scheme also provide it is a kind of can make pick-up current measurement network 6 bear high input voltage and improve device precision
Extremely economic method, referring specifically to Fig. 2.Prevent the target high voltage of overload for the alternating current of 300V virtual value in the case
Pressure.In order to produce antioverloading pick-up current measurement network, used in the component selection of measurement network it is high pressure resistant and
High-power component, specific component parameter value and its to reach mode as follows.
1) resistance RS, using line around power resistor, this kind of resistance has the characteristic of low inductance parameters, Low Drift Temperature.It is adopted at this
It is carried out with the resistance of two 3k 20W used in parallel, takes processing mode in parallel to be easy to get precision and be up to 0.1% or more
Target resistance values.
2) resistance RB, using line around power resistor, this kind of resistance has the characteristic of low inductance parameters, Low Drift Temperature.It is adopted at this
It is carried out with the resistance of two 1k 10W used in parallel, takes processing mode in parallel to be easy to get precision and be up to 0.1% or more
Target resistance values.
3) capacitor CS, using the thin film capacitor with extension structure of metal foil figure, such as CBB electric capacity, the capacitor of the type
Device has the characteristic of low parasitic inductance.It is used in parallel using the capacitor progress of two 0.11uF 400V at this, take place in parallel
Reason mode is easy to get the target capacitance value that precision is up to 0.1% or more, and can be reduced inductance error.
4) resistance R1, using metal film resistor, this kind of resistance has the characteristic of low inductance parameters, Low Drift Temperature.It is adopted at this
It is carried out with the resistance of two 20k 0.5W used in parallel, takes processing mode in parallel to be easy to get precision and be up to 0.1% or more
Target resistance values.
5) capacitor C1, using the thin film capacitor with extension structure of metal foil figure, such as CBB electric capacity, the capacitor of the type
Device has the characteristic of low parasitic inductance.It is used in parallel using the capacitor progress of two 0.011uF 200V at this, take parallel connection
Processing mode is easy to get the target capacitance value that precision is up to 0.1% or more, and can be reduced inductance error.
The shielded layer of measurement network 6 in present case has used sheet metal, is being surveyed by conductive continuous encapsulated by structures
It measures outside circuit, to play the purpose of shielding space electromagnetic radiation.The end B of the shielded layer and measuring circuit is conductively connected.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (9)
1. a kind of Touch current tester, including sample power filtering module (1), isolating transformer (2), polarity switching module
(3), sample power output socket (4), measurement position switching and ground wire disconnect module (5), measurement network (6), measurement network list
Solely using switching module (7), the first shielding line (8), secondary shielding line (9), instrument power supply filter module (10), instrument electricity
Source (11), electromagnetic isolation cabin (12), traffic filter (13), general-purpose interface (14), oscilloscope module (15), sample power supply line
(17), metallic shield cabinet (18), the sample power filtering module (1) are mounted on metal chassis (18), power to sample
Power supply line entered in metallic shield cabinet (18) by sample power filtering module (1), which is characterized in that the sample electricity
Source accessory power outlet (4) is mounted on metallic shield cabinet (18), and the sample power filtering module (1) is sequentially connected isolation transformation
Device (2), polarity switching module (3) and sample power output socket (4), sample power output socket (4) pass through sample power supply line
(17) sample (16) are connected, isolating transformer (2) is also respectively connected with measurement position switching and ground wire disconnects module (5) and surveys
It measures network and switching module (7) is used alone, measurement position switching and ground wire disconnect module (5) and be also respectively connected with the output of sample power supply
Socket (4) and measurement network (6), measurement network (6) are also connected with measurement network and switching module (7) are used alone, measure network (6)
Also by secondary shielding line (9) connection signal filter (13), traffic filter (13) is mounted on before general-purpose interface (14), is led to
It is BNC connector with interface (14), is mounted between electromagnetic isolation cabin (12) and metallic shield cabinet (18) inside, traffic filter
(13) by general-purpose interface (14) connection oscilloscope module (15), oscilloscope module (15) also connects instrument by instrument power source (11)
Device power supply filter module (10), instrument power supply filter module (10) are mounted on metal chassis (18), are supplied to instrument
The power supply line of electricity enters the electromagnetic isolation cabin in metallic shield cabinet (18) by instrument power supply filter module (10)
(12) in, the measurement position switching and ground wire disconnect module (5) and measure network exclusive use switching module (7) and also all connect
To on the first shielding line (8)；
It is equipped with one or more electromagnetic isolation cabins (12) in the metallic shield cabinet (18), can be produced having in normal work
The device of raw electromagnetic interference, or will lead to the device that metallic shield cabinet (18) conducting continuity is destroyed and be placed in cofferdam.
2. Touch current tester according to claim 1, which is characterized in that the sample power filtering module (1) is
The corresponding low-pass filter of 400Hz, the instrument power supply filter module (10) are the corresponding low-pass filter of 50Hz, instrument
Power supply (11) is linear variable-voltage power supply of the 220V to low pressure, and the oscilloscope module (15) is showing with 10MHz bandwidth
Wave device module, the metallic shield cabinet (18) are the metal boxes with conducting continuity.
3. Touch current tester according to claim 1, which is characterized in that the isolating transformer (2) be 1:1 every
From transformer.
4. Touch current tester according to claim 1, which is characterized in that the measurement network (6) may include 1 or
Above pick-up current measures network, is selected by stacked switch, primary only to connect one of measurement network.
5. Touch current tester according to claim 1, which is characterized in that the sample power output socket (4)
It is placed in an electromagnetic isolation cabin (12).
6. Touch current tester according to claim 1, which is characterized in that first shielding line (8) is double-deck compiles
It knits plus aluminum foil shielded line, the secondary shielding line (9) is double braid line.
7. a kind of detection method using the Touch current tester as described in claim 1-6 is any, which is characterized in that including
Following steps: the power supply powered to sample is arranged outside measuring instrument, after power supply presses the good voltage of featured configuration of sample, frequency
L, N power supply line are connected by sample power filtering module (1) and measuring instrument, and by sample power output socket (4) with
Sample power supply line (17) connection, realizes and provides power supply to sample, passes through polarity switching module (3) in normal condition test process
The polarity for switching a sample power supply disconnects a N line or without disconnecting N as required in simulated failure test process
Line；
Measurement position switching and ground wire disconnect module (5) and keep isolating transformer (2) to arrive sample in normal condition test process
Ground wire is connected between power output socket (4), while being kept between the core wire in measurement network (6) and the first shielding line (8)
It connects, disconnects a ground wire as required in simulated failure test process, and measurement network (6) is connected to the output of sample power supply
On the ground wire of socket (4)；
Switching module (7), which are used alone, in measurement network has 2 kinds of working conditions as needed, the first is using measuring instrument to sample
Power supply measures network (6) and isolating transformer (2) at this time and connects, rather than is connected on the shielded layer of the first shielding line (8)；The
Two kinds are single use measurement network (6), and the power supply or measurement point that are detached from tester at this time are two accessible points on sample,
Measurement network (6) and isolating transformer (2) are disconnected, and the connecting line on measurement network (6) is switched to the first shielding line (8)
Shielded layer on.
8. the detection method of Touch current tester according to claim 7, which is characterized in that the measurement network (6)
Including resistance R1, resistance RS, resistance RB, capacitor CS and capacitor C1, the measurement terminal A for measuring network (6) is separately connected resistance RS
With capacitor CS, the resistance RS other end is separately connected the capacitor CS other end, resistance RB and resistance R1, and the resistance R1 other end connects capacitor
C1, the capacitor C1 other end are separately connected the resistance RB other end and measure the measurement terminal B of network (6)；The both ends the resistance RB
Voltage is set as U1, and the voltage at the both ends capacitor C1 is set as U2.
9. the detection method of Touch current tester according to claim 8, which is characterized in that the oscilloscope module
(15) type of shown value will be set according to the type of selected measurement network when in use, when selection measures U1
It is set as display real available value voltage value, peak value display voltage value is set as when selection measures U2, when measuring direct current sample
It will be set as display DC voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811606037.3A CN109541286B (en) | 2018-12-27 | 2018-12-27 | Contact current detection method and tester |
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