CN110286334A - A kind of DC power supply analogue ground test device - Google Patents
A kind of DC power supply analogue ground test device Download PDFInfo
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- CN110286334A CN110286334A CN201910554718.8A CN201910554718A CN110286334A CN 110286334 A CN110286334 A CN 110286334A CN 201910554718 A CN201910554718 A CN 201910554718A CN 110286334 A CN110286334 A CN 110286334A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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Abstract
The invention discloses a kind of DC power supply analogue ground test devices, device includes box body, the test circuit set on tray interior, test circuit includes the first circuit where voltage acquisition mechanism, the first end of first circuit is connected at the first conductor of box portion outside, first conductor can connect direct current system, second end is connected at the second conductor of box portion outside, and the second conductor can connect the earth, and the display unit that voltage obtains mechanism is emerging in box portion outside.The present invention passes through the first circuit of setting, and the first end of the first circuit is enabled to be connected at the first conductor of box portion outside, second end is connected at the second conductor of box portion outside, and the display unit of voltage acquisition mechanism is emerging in box portion outside, test device is set to have the function of showing alternating voltage and DC voltage, tester no longer needs to by multimeter, to facilitate tester's observation.
Description
Technical field
The invention belongs to DC power supply analogue ground test device fields, specifically, being related to a kind of DC power supply simulation
Earthing test device.
Background technique
Direct current system is mainly used in power plant, power station, wind power station, nuclear power station and all kinds of power transformations in electric system
It stands, there are also other users's (such as power distribution station, petrochemical industry, steel, electric railway, communication system) using DC equipment.
For electric system, direct current system is the very important component part of substation, its main task be exactly to
Protective relaying device, breaker operator, various types of signal circuit provide power supply.Whether the normal operation of direct current system, be related to after
Can electric protection and breaker correctly act, and will affect the safe operation of substation or even entire power grid.Certainly with electric system
The needs that dynamicization, computer control and the development of power electronic technique and actual field run and safeguard, to direct current system safety
The requirement of property also correspondinglys increase.Moreover, because field condition is complicated, direct-flow electricity utilization apparatus is more, what direct current system was grounded
Situation is more.In order to ensure the normal operation of equipment, according to the requirement of related regulation, need periodically to simulate direct current system
Earthing test is normal to ensure its function.
The device for being currently applied to analogue ground test is the resistance of a fixed resistance value, simply by fixed resistance value
Resistance accesses between DC power system positive and negative electrode and the earth, is unable to adjust resistance sizes, and testing crew afterwards cannot over the ground by hand
Intuitive display voltage-to-ground exists to go to the wrong way to be spaced and accidentally tests exchange as direct current, can not judge that test connection is
It is no good, not only low efficiency, test is imperfect but also there are security risks.There are no dedicated direct current system moulds currently on the market
Quasi- earthing test device.
In view of this present invention is specifically proposed.
Summary of the invention
The technical problem to be solved in the present invention is that overcoming the deficiencies of the prior art and provide a kind of DC power supply analogue ground
Test device, to solve to operate relatively complicated technical problem when tester observes direct current system voltage-to-ground.
In order to solve the above technical problems, the present invention is using the basic conception of technical solution:
A kind of DC power supply analogue ground test device, device include box body, the test circuit set on tray interior, test
Circuit includes that voltage obtains the first circuit where mechanism, and what the first end of the first circuit was connected at box portion outside first leads
Body, the first conductor can connect direct current system, and second end is connected at the second conductor of box portion outside, and the second conductor can connect greatly
Ground, the display unit that voltage obtains mechanism are emerging in box portion outside.
Further, it includes the first protective resistance being set on the first circuit, two input terminals and first that voltage, which obtains mechanism,
The concatenated rectifier bridge of protective resistance and connect with two DC output ends of rectifier bridge forming circuit, constitute voltage and obtain mechanism it is aobvious
Showing the magnetoelectricity series ammeter in portion, wherein two input terminal of rectifier bridge shares for AC and DC, and the first protective resistance is both range resistance,
It is the protective resistance of the first circuit again, can effectively protect rectifier bridge internal short circuit fault.
Further, the first protective resistance is 100 kilo-ohms of resistance；Magnetoelectricity series ammeter is 40 micro aning ammeter of magnetoelectricity series.
Further, test circuit further includes first resistor and the concatenated second circuit of adjustable resistance, second circuit and the
One circuit in parallel, the first end of second circuit connect the first conductor, and second end connects the second conductor, and the adjustment portion of adjustable resistance is aobvious
It is exposed at box portion outside；First resistor is 10 kilo-ohms of resistance；Adjustable resistance is 50 kilo-ohms of potentiometers.
Further, the second protective resistance that can protect second circuit is additionally provided on second circuit；Second protective resistance is
10 kilo-ohms, 1/16W resistance.
Further, the switch of the first circuit of on-off is additionally provided on the first circuit, the switching part of switch is emerging in outside box body
Portion use device can separately as 0~250V AC and DC adaptive voltage detection table.
Further, test circuit further includes the first light emitting diode and the second light emitting diode reverse parallel connection and and second
The first end of the concatenated tertiary circuit of resistance, tertiary circuit and the first circuit in parallel, tertiary circuit connects the first conductor, second end
Connect the second conductor, the illumination region of the illumination region of the first light emitting diode and the second light emitting diode is emerging in box portion outside；The
Two resistance are 330 kilo-ohms of resistance, so that the first light emitting diode and the second light emitting diode is can be used as electrification display, simultaneously also
As AC and DC power supply type, polarity instruction.
Preferably, the first light emitting diode and the second light emitting diode are heterochromatic.
Further, the third protective resistance that can protect tertiary circuit is additionally provided on tertiary circuit；Third protective resistance is
10 kilo-ohms, 1/16W resistance.
Preferably, third protective resistance and the second protective resistance are same resistance.
Further, it tests and is additionally provided with can protect the first circuit and/or second circuit and/or tertiary circuit the on circuit
Four protective resistances.Preferably, device is pen type structure.
After adopting the above technical scheme, compared with the prior art, the invention has the following beneficial effects:
The present invention is enabled the first end of the first circuit be connected at the first of box portion outside and is led by the first circuit of setting
Body, second end is connected at the second conductor of box portion outside, and the display unit of voltage acquisition mechanism is emerging in box portion outside, makes to survey
Trial assembly, which is set, has the function of showing that alternating voltage and DC voltage, tester are no longer needed to by multimeter, to facilitate survey
Examination personnel observation.
A specific embodiment of the invention is described in further detail with reference to the accompanying drawing.
Detailed description of the invention
Attached drawing is as a part of the invention, and for providing further understanding of the invention, of the invention is schematic
Examples and descriptions thereof are used to explain the present invention, but does not constitute an undue limitation on the present invention.Obviously, the accompanying drawings in the following description
Only some embodiments to those skilled in the art without creative efforts, can be with
Other accompanying drawings can also be obtained according to these attached drawings.In the accompanying drawings:
Fig. 1 shows the schematic diagram of DC power supply analogue ground test device provided by one embodiment of the invention；
Fig. 2 shows it is normal provided by one embodiment of the invention when direct current system equivalent circuit over the ground；
Direct current system equivalent circuit over the ground when Fig. 3 shows test for ground provided by one embodiment of the invention；
Direct current system equivalent circuit over the ground when Fig. 4 shows failure provided by one embodiment of the invention；
Fig. 5-6 shows the structural representation of DC power supply analogue ground test device provided by one embodiment of the invention
Figure.
In figure: the first circuit of 1-, 2- second circuit, 3- tertiary circuit, 4- box body, the first conductor of 5-, the second conductor of 6-, 7-
Voltage obtains the display unit of mechanism, and the illumination region of the first light emitting diode of 8-, the illumination region of the second light emitting diode of 9-, 10- can
Adjust the adjustment portion of resistance, the switching part of 11- switch.
It should be noted that these attached drawings and verbal description are not intended to the design model limiting the invention in any way
It encloses, but illustrates idea of the invention by referring to specific embodiments for those skilled in the art.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in embodiment is clearly and completely described, the following examples are intended to illustrate the invention, but
It is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, it can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As shown in Figure 1, the embodiment of the present invention describes a kind of DC power supply analogue ground test device, device includes box
Body 4, the test circuit inside box body 4, test circuit include the first circuit 1 where voltage acquisition mechanism, the first circuit 1
First end be connected at the first conductor 5 outside box body 4, the first conductor 5 can connect direct current system, and second end is connected at box
The second conductor 6 outside body 4, the second conductor 6 can connect the earth, and the display unit 7 that voltage obtains mechanism is emerging in outside box body 4.
The present invention enables the first end of the first circuit 1 be connected at first outside box body 4 by the first circuit 1 of setting
Conductor 5, second end is connected at the second conductor 6 outside box body 4, and the display unit 7 of voltage acquisition mechanism is emerging in outside box body 4
Portion makes test device have the function of showing that alternating voltage and DC voltage, tester are no longer needed to by multimeter, thus side
Tester observation.
Embodiment one
As shown in Figure 1, it includes the first protective resistance being set on the first circuit 1, two that voltage, which obtains mechanism, in the present embodiment
Input terminal connect forming circuit, structure with the concatenated rectifier bridge AB of the first protective resistance and with two DC output ends of rectifier bridge AB
The magnetoelectricity series ammeter G of mechanism display unit is obtained at voltage, wherein two input terminal of rectifier bridge shares for AC and DC, the first protection
Resistance is both the protective resistance of range resistance and the first circuit 1, can effectively protect rectifier bridge internal short circuit fault.
Specifically, 1 part is tension measuring circuit in schematic diagram.The tension measuring circuit is different from zero frequency span, exchange shelves
The tension measuring circuit of position can directly measure alternating voltage and DC voltage, and DC voltage measurement input is without examining
Consider positive-negative polarity.The present invention enables devices to measure and shows AC or DC over the ground and voltage between phases value by above-mentioned setting,
It can also test and judge whether to occur in when experimentation and non-experiment and test point (or testing site) homopolarity or corresponding
Pole ground fault.
Preferably, the first protective resistance Fa is 100 kilo-ohms of resistance；Magnetoelectricity series ammeter G is 40 micro aning ammeter of magnetoelectricity series.
Specifically, the Fa of 1 part is voltage measurement circuit range resistance in schematic diagram.The resistive element is protected using 1/16W
Resistance is protected, in the certain time under working state of device, if there is outranging, rectify in ground fault or rectification module AB
It can fuse automatically when shorted diode, cut off voltage measurement circuit to realize the defencive function to tension measuring circuit.
Embodiment two
As shown in Figure 1, the difference of the present embodiment and above-described embodiment one is, test circuit further include first resistor F1 and
The concatenated second circuit 2 of adjustable resistance, second circuit 2 and the first circuit 1 are in parallel, and the first end connection first of second circuit 2 is led
Body 5, second end connect the second conductor 6, and the adjustment portion 10 of adjustable resistance is emerging in outside box body 4；First resistor F1 is 10 kilo-ohms
Resistance；Adjustable resistance is 50 kilo-ohms of potentiometers.
Preferably, the second protective resistance Fb that can protect second circuit 2 is additionally provided on second circuit 2；Second protective resistance
Fb is 10 kilo-ohms, 1/16W resistance.
Specifically, 2 parts are DC simulation test for ground circuits in schematic diagram, and device is made to have DC simulation earthing test
Electroscope function.Wherein, which is realized using 1/16W protective resistance Fb, if it is extremely pure to occur in test other one
Its fusible when ground fault cuts off hookup.Furthermore it is possible to according to different manufacturers, the need of different tests standard and requirement
It to be adjusted by the grounding resistance that 50K potentiometer is tested, keep direct current system analogue ground test scope adjustable, Neng Gouman
The needs of sufficient different manufacturers, different circuit criterias and requirement are adjusted.
It is further preferred that being additionally provided with the switch K of the first circuit of on-off 1 on the first circuit 1, the switching part 11 of switch K is aobvious
It is exposed at outside box body 4, use device can separately as 0~250V AC and DC adaptive voltage detection table.
Specifically, switch K is switching switch in schematic diagram.The switch realizes voltage detecting function and test for ground function
Switching.K is switched into voltage detecting function end (connecting terminal being separately provided in schematic diagram), detection system wiring before the test
Whether end is correct, and K is switched to test for ground function end (connecting the connecting terminal of circuit in schematic diagram) after confirmation is correct and is carried out
Test.The work for eliminating frequently replacement instrument in this way, has saved the time, has simplified operating procedure, and the maloperation avoided guarantees
The safety of testing crew and equipment.
Embodiment three
As shown in Figure 1, the difference of the present embodiment and above-described embodiment one, two is, test circuit further includes first luminous
Diode D1 and the second light emitting diode D2 reverse parallel connection and and the concatenated tertiary circuit 3 of second resistance F2, tertiary circuit 3 and the
One circuit 1 is in parallel, and the first end of tertiary circuit 3 connects the first conductor 5, and second end connects the second conductor 6, the first light emitting diode
The illumination region 9 of the illumination region 8 of D1 and the second light emitting diode D2 are emerging in outside box body 4；Second resistance F2 is 330 kilo-ohms of electricity
Resistance makes the first light emitting diode D1 and the second light emitting diode D2 can be used as electrification display, while being also used as AC DC electric
Source Type, polarity instruction.
Specifically, 3 parts are AC and DC voltage identification indicating circuits in schematic diagram, and device is made to have (alternating current-direct current low tension
Road) electroscope function.The circuit can be with the polarity of automatic identification AC and DC power supply type and direct-flow input end.The present invention passes through upper
The property (being exchange or direct current) that automatic identification circuit-under-test is capable of in setting is stated, can indicate that polarity of ground if it is direct current
(positive or negative pole).Realize that (illumination region 8 of the first light emitting diode D1 is bright to shine for anode, second especially by indicator light
The bright illumination region 9 of diode D2 is cathode, the illumination region of the illumination region 8 of the first light emitting diode D1 and the second light emitting diode D2
9 is bright for alternating current circuit), additionally it is possible to judge whether test connection is good, especially by the illumination region of the first light emitting diode D1
8, whether the illumination region 9 of the second light emitting diode D2 shines and is judged.
Preferably, the first light emitting diode D1 and the second light emitting diode D2 are heterochromatic.Such as, the first light emitting diode D1 is red
Color, the second light emitting diode D2 are heterochromatic for green.
It is furthermore preferred that being additionally provided with the third protective resistance that can protect tertiary circuit 3 on tertiary circuit 3；Third protective resistance
For 10 kilo-ohms, 1/16W resistance.
It is further preferred that third protective resistance and the second protective resistance Fb are same resistance.Specifically, the second protection electricity
The component that Fb is most upstream on second circuit 2 is hindered, the first end of tertiary circuit 3 connects the second protective resistance Fb and protects with second
Resistance Fb is adjacent, the first circuit 1 between the component in the second downstream protective resistance Fb, and second end connects the second conductor 6,
Make the second protective resistance Fb and the same resistance of third protective resistance.
Example IV
As shown in Figure 1, the difference of the present embodiment and above-described embodiment one to three is, tests on circuit and be additionally provided with and can protect
4th protective resistance FU of the first circuit 1 and/or second circuit 2 and/or tertiary circuit 3.4th protective resistance FU is fuse.
Specifically, FU is way circuit insurance in schematic diagram.The present invention makes device have defencive function by above-mentioned setting,
Under circuit-under-test over-voltage condition, protective resistance can fuse, with protective device and circuit-under-test.
Wherein, the first circuit 1, second circuit 2 and tertiary circuit 3 are protected through the first conductor of same connection circuit connection 5, the 4th
Resistance FU is protected to be set on above-mentioned connection circuit.
Embodiment five
As seen in figs. 5-6, the difference of the present embodiment and above-described embodiment one to four is, device is pen type structure.
Specifically, box body 4 is strip, and 4 first end end face of box body is equipped with mounting hole, and second end end face is equipped with connection
Hole, connecting hole internal sleeve are equipped with connecting cylinder, and connecting cylinder first end is at the same level with outer peripheral surface on the outside of connecting hole, and second end extends to box
Inside body 4, to connect circuit, and it is connected to cylinder fixed setting；First conductor 5 is the bar extended in the same direction with box body 4, the first conductor 5
First end is freely set to outside box body 4, and second end self installation hole is penetrated to box body 4, to connect circuit, and the first conductor
5 fixed settings；Second conductor 6 is the line that both ends are respectively provided with connected structure, and one of connected structure is inserted into connecting cylinder
And it is fixed, to connect circuit through connecting cylinder.Wherein, when box body is laterally arranged, be oppositely arranged by setting up and down and opening the
One cavity and the second cavity dock, and mounting hole is by the first notch of the first cavity opening first end and the second cavity opening
Second notch of one end docks, connecting hole by the first cavity opening second end third notch and the second cavity opening second
4th notch at end docks.
The present invention is not necessarily to device itself power supply (battery or external power supply) by above-mentioned setting, reduces maintenance, volume
Small, it is convenient to carry and use.
Following experiment has been carried out in invention DC power supply analogue ground test device:
The effect of protective resistance F2 (10 kilohms of resistance value) in schematic diagram: when we are when testing anode, when
When cathode ground fault and resistance value occurs lower than certain numerical value, F1 will fuse, and play a protective role to equipment.
How the power of protective resistance F2 (10 kilohms of resistance value) selects in schematic diagram:
As in Figure 2-4, it is tested by the DC simulation test for ground of many years, test for ground is done with 20k Ω, measurement connects
Earth-current is less than 2mA.We are calculated with 1/16 watt of protective resistance.
Its rated current I=(1/16) W/10000 Ω=2.5mA
It is scaled namely to reach its specified electricity because protective resistance fusing condition is 9 times for reaching its rated power
3 times, i.e. 2.5 × 3=7.5mA, 20k Ω+R ground connection=220V/0.0075A of stream show that R is grounded=9333 Ω
Acquire: F1 selects 1/16 watt of protective resistance, when analogue ground test is done in a certain pole, if sent out in another pole
When raw insulation against ground is less than 9000 Ω ground fault, F1 can fuse, and play a protective role to equipment.
It is analyzed in direct current system over the ground equivalent circuit, for test pencil under voltage detection mode, positive and negative electrode should be voltage
110V (live reference instrument actual measurement: voltage 115V, this test pencil indicate 110V) is in view of multifunctional DC analogue ground is tested
The sensitivity and error of 40 micro aning ammeter G of magnetoelectricity series in pen, so direct current system is worked normally under voltage detection mode
Instruction (green) section is set as 75V~125V, 75V the following are there is ground fault (yellow) section with test point same polarity,
125V or more is that the polarity opposite with test point ground fault (red) section occurs.
Test pencil is in DC system grounding test model, by analysis voltage Ying Yuan little in direct current system over the ground equivalent circuit
Pass through live reference instrument actual measurement: voltage 45V in 110V, this test pencil indicates 40V, examines the wave that In situ DC voltage value is arrived in filter
The sensitivity and error of 40 micro aning ammeter G of magnetoelectricity series in dynamic and test pencil, therefore direct current system is determined in the case where being grounded die trial formula
It works normally instruction (green) section and is set as 25V~75V, the following are ground fault (yellow) occur with test point same polarity by 25V
Section, 75V or more are that the polarity opposite with test point ground fault (red) section occurs.
The above is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this patent
Member without departing from the scope of the present invention, when the technology contents using above-mentioned prompt make it is a little change or be modified to
The equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, it is right according to the technical essence of the invention
Any simple modification, equivalent change and modification made by above embodiments, in the range of still falling within the present invention program.
Claims (10)
1. a kind of DC power supply analogue ground test device, it is characterised in that: device includes box body, the test set on tray interior
Circuit, test circuit include the first circuit where voltage acquisition mechanism, and the first end of the first circuit is connected at box portion outside
The first conductor, the first conductor can connect direct current system, and second end is connected at the second conductor of box portion outside, and the second conductor can
Connection the earth, the display unit that voltage obtains mechanism are emerging in box portion outside.
2. a kind of DC power supply analogue ground test device according to claim 1, it is characterised in that: voltage obtains mechanism
Including the first protective resistance, two input terminals and the concatenated rectifier bridge of the first protective resistance and and rectifier bridge being set on the first circuit
Two DC output ends connection forming circuit, constitute voltage obtain mechanism display unit magnetoelectricity series ammeter.
3. a kind of DC power supply analogue ground test device according to claim 2, it is characterised in that: the first protective resistance
For 100 kilo-ohms of resistance；Magnetoelectricity series ammeter is 40 micro aning ammeter of magnetoelectricity series.
4. a kind of DC power supply analogue ground test device according to claim 1, it is characterised in that: test circuit also wraps
First resistor and the concatenated second circuit of adjustable resistance, second circuit and the first circuit in parallel are included, the first end of second circuit connects
The first conductor is connect, second end connects the second conductor, and the adjustment portion of adjustable resistance is emerging in box portion outside；First resistor is 10 kilo-ohms
Resistance；Adjustable resistance is 50 kilo-ohms of potentiometers.
5. a kind of DC power supply analogue ground test device according to claim 4, it is characterised in that: on second circuit also
Equipped with the second protective resistance that can protect second circuit；Second protective resistance is 10 kilo-ohms, 1/16W resistance.
6. a kind of DC power supply analogue ground test device according to claim 4, it is characterised in that: on the first circuit also
The switching part of switch equipped with the first circuit of on-off, switch is emerging in box portion outside.
7. a kind of DC power supply analogue ground test device according to claim 1, it is characterised in that: test circuit also wraps
Include the first light emitting diode and the second light emitting diode reverse parallel connection and and the concatenated tertiary circuit of second resistance, tertiary circuit and
First circuit in parallel, the first end of tertiary circuit connect the first conductor, and second end connects the second conductor, the first light emitting diode
The illumination region of illumination region and the second light emitting diode is emerging in box portion outside；Second resistance is 330 kilo-ohms of resistance.
8. a kind of DC power supply analogue ground test device according to claim 7, it is characterised in that: on tertiary circuit also
Equipped with the third protective resistance that can protect tertiary circuit.
9. a kind of DC power supply analogue ground test device according to claim 8, it is characterised in that: third protective resistance
For 10 kilo-ohms, 1/16W resistance.
10. -9 any a kind of DC power supply analogue ground test device according to claim 1, it is characterised in that: test
The 4th protective resistance that can protect the first circuit and/or second circuit and/or tertiary circuit is additionally provided on circuit.
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| CN201910554718.8A CN110286334A (en) | 2019-06-25 | 2019-06-25 | A kind of DC power supply analogue ground test device |
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| CN201910554718.8A CN110286334A (en) | 2019-06-25 | 2019-06-25 | A kind of DC power supply analogue ground test device |
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| CN105866720A (en) * | 2016-05-23 | 2016-08-17 | 国网浙江省电力公司紧水滩水力发电厂 | Fault simulation device for direct-current system |
| CN210347884U (en) * | 2019-06-25 | 2020-04-17 | 哈尔滨锐驰风力发电有限责任公司 | DC power supply simulation grounding test device |
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- 2019-06-25 CN CN201910554718.8A patent/CN110286334A/en active Pending
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