CN201622315U - Grounding detector for locomotive electric circuits - Google Patents
Grounding detector for locomotive electric circuits Download PDFInfo
- Publication number
- CN201622315U CN201622315U CN2010201267074U CN201020126707U CN201622315U CN 201622315 U CN201622315 U CN 201622315U CN 2010201267074 U CN2010201267074 U CN 2010201267074U CN 201020126707 U CN201020126707 U CN 201020126707U CN 201622315 U CN201622315 U CN 201622315U
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- locomotive
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- time controller
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Abstract
The utility model relates to a grounding detector for locomotive circuits, which comprises a current measuring probe, a multifunctional measuring instrument and the like. Time controllers are connected to the positive end and the negative end of a circuit; measuring buttons are serially connected to control circuits of the time controllers; outlets of the time controllers are respectively connected with coils of two contactors; normally open contacts of the two contactors are respectively connected to connection points of the time controllers in the circuit; then the two normally open contacts are jointly connected to one end of a testing resistor; the other end of the testing resistor is connected with a socket; and a signal feedback detecting circuit, the multifunctional measuring instrument and the current measuring probe are sequentially connected among the two normally open contacts and the testing resistor. The grounding detector can safely, rapidly and accurately find a grounding point in states of no wire throwing for the locomotive circuit and without power failure, greatly lowers time and energy in looking for failures, improves working efficiency and ensures safety of railway transportation.
Description
Technical field
The utility model relates to a kind of electric fault somascope, specifically relates to a kind of locomotive electric cad system line-to-ground somascope, belongs to the pick-up unit technical field.
Background technology
Railway is the lifeblood of national economy, and safety of railway transportation, the influence to the transport power of railway on time are very big, and is therefore, most important as the kilter of the locomotive of the power of transportation by railroad.But in actual shipment, locomotive can on the way not break down, and in order to reduce the influence to whole transportation by railroad system, resolves problem as early as possible, to recover power extremely important.On locomotive, the easiest part that breaks down is exactly an electric wiring, is exactly electric wiring earth fault and be difficult to search, handle the most consuming time in the electric fault the most.
Now, all locomotive depot in the whole nation in locomotive electric cad system line-to-ground fault investigation, all neither one safety, modernized detection means accurately and fast.Common way is to go investigation and judgement by the worker with charged fishing line method and not charged fishing line insulation measurement method.These two kinds of methods operate all very loaded down with trivial details, and workload is also very big, and are consuming time also very long, have a lot of unsafe factors in investigation.As: locomotive electric wiring negativing ending grounding, the worker at first will judge regional negative wire investigation fishing line roughly, find after the approximate region again to each branch road investigation, fishing line judges, finds again each contact on the branch road to be carried out fishing line behind the ground path of branch road and judge earth point.Lacked in investigation like this and will get rid of tens lines, many will get rid of tens lines, workload is big.An earth point is looked into, the fast dozens of minutes of wanting, and the slow several hrs, operating personnel wanted wants at least that two people are above to be cooperated.Can be bigger as not charged investigation workload.Also can adopt when said method overhauls in storehouse, but in the operation way, permission on the time causes transporting slow possibly or machine is broken, machine story part.
The utility model content
For solving the deficiencies in the prior art, it is a kind of when earth fault appears in the locomotive electric cad system circuit that the utility model provides, can safety under not to locomotive circuit fishing line and the state that do not cut off the power supply, find the locomotive electric cad system line-to-ground somascope of earth point fast and accurately.
For achieving the above object, the technical solution of the utility model is:
A kind of locomotive electric cad system line-to-ground somascope, it is characterized in that comprising current measurement probe, polymeter, the signal feedback observation circuit, test resistance, time controller and testing button, described time controller is connected on the positive and negative two ends of circuit, in the control circuit of time controller, be in series with testing button, the outlet of time controller connects the coil of two contactors respectively, the normally open contact of two contactors is connected on respectively after the contact of time controller in the circuit, two normally open contacts are connected an end of test resistance jointly, the other end gang socket of test resistance; Between two normally open contacts and test resistance, connect signal feedback observation circuit, polymeter and current measurement probe successively.
Aforesaid locomotive electric cad system line-to-ground somascope is characterized in that also being connected with LCDs on described signal feedback observation circuit.
Aforesaid locomotive electric cad system line-to-ground somascope is characterized in that also being connected with hummer on described signal feedback observation circuit.
Aforesaid locomotive electric cad system line-to-ground somascope is characterized in that being in series with overcurrent relay between the normally open contact of the contact of time controller in described circuit and contactor.
Aforesaid locomotive electric cad system line-to-ground somascope is characterized in that being in series with insurance between the normally open contact of the contact of time controller in described circuit and contactor.
Aforesaid locomotive electric cad system line-to-ground somascope is characterized in that also being connected with the test resistance fan electromotor in the outlet of described time controller.
The beneficial effects of the utility model are: the utility model utilizes the phenomenon of locomotive car body as the earth point consubstantiality difference of a carrying object and locomotive electric cad system circuit, increasing an electric current outside the locomotive electric cad system circuit is connected with car body, connection in series-parallel principle of work according to circuit, when earth point, the circuit of locomotive earth point and impressed current have electric current to be changed, investigate according to the variation of electric current on the earth point of grounding circuit, safety like this, accurately, fast, convenient, simply, can be when earth fault appears in the locomotive electric cad system circuit, can safety under not to locomotive circuit fishing line and the state that do not cut off the power supply, fast, find earth point exactly, greatly reduce the time and efforts of searching fault, improve work efficiency, guaranteed safety of railway transportation.
Description of drawings
Fig. 1 is a circuit theory synoptic diagram of the present utility model;
Fig. 2 is pure negativing ending grounding channel check judgment task principle;
Fig. 3 is pure end ground connection channel check judgment task principle
Fig. 4 is an electrical appliance positive ending grounding channel check judgment task principle.
The implication of mark among the figure:
SJ: the time relay, KS: testing button, MD: test resistance fan electromotor, R: test resistance, RA: insurance, KC: overcurrent relay, KM1, KM2: contactor coil, KM1-1, KM2-1: contactor normally open contact, AC: signal feedback observation circuit, JK: polymeter, SC: current measurement probe.
Embodiment
Below in conjunction with accompanying drawing the utility model is done concrete being described below:
When certain circuit of locomotive had grounding phenomenon, this tester can safety under not to locomotive circuit fishing line and the state that do not cut off the power supply, fast, accurately find earth point.
Principle of work of the present utility model:
Fig. 1 is a circuit theory synoptic diagram of the present utility model.As shown in the figure, the utility model has polymeter JK, test resistance R, time controller SJ, signal feedback observation circuit AC, current measurement probe SC, contactor, overcurrent relay KC, testing button KS, test resistance fan electromotor MD, insurance RA etc.Time controller SJ is connected on the positive and negative two ends of circuit, in the control circuit of time controller SJ, be in series with testing button KS, the outlet of time controller SJ connects coil KM1, the KN2 of two contactors respectively, normally open contact KM1-1, the KM2-1 of two contactors is connected on respectively after the contact of time controller SJ in the circuit, two normally open contact KM1-1, KM2-1 are connected the end of test resistance R jointly, the other end gang socket of test resistance R; Between two normally open contact KM1-1, KM2-1 and test resistance R, connect signal feedback observation circuit AC, polymeter JK and current measurement probe SC successively.The utlity model has automatic measurement, warning automatically, positive and negative metering circuit conversion and multi-functional automatic measuring ability automatically.It mainly is the measuring resistance that one 80 Europe is arranged.About rated current 1A, be to provide ground current with detected, have two positive and negative 110V attaching plugs to be connected to locomotive 110V power supply, for the utility model provides working power to grounding circuit.Other has a plug is current measurement probe, and also having a plug is that ground wire of the present utility model is connected with locomotive car body, and the earth point that is formed at the locomotive electric cad system circuit constitutes a loop.The rated current that the utility model is provided, by car body and two earth points locomotive grounding circuit and the utility model circuit are linked up, grounding circuit generation electric current is changed, by current measurement probe SC of the present utility model, record electric current and change, find earth point.
Characteristics of the present utility model:
1, the utility model is inserted the positive and negative power supply of locomotive 110V, as the working power of test circuit, another aspect is as the positive and negative ground loop power supply of test resistance R.The other end of test resistance is connected with locomotive car body.When needs were tested circuit, current measurement probe SC blocked the line of certain circuit, press testing button KS simultaneously, time relay sj work, and contactor coil KM1, KM2 replace.KM1-1, the exchange of KM2-1 normally open contact are connected.As locomotive is negativing ending grounding, and electric current is got back to the negative terminal circuitry lines in the grounding circuit by overcurrent relay KC, contactor KM1, test resistance R.The main track of synchronous signal feedback monitoring circuit AC detects a current signal, gives polymeter JK.Change increase (more than 1A) if current measurement probe records electric current, explanation is pure negativing ending grounding, the negativing ending grounding of buzzer warning, and demonstration simultaneously.As record electric current less than 1A, and earth point being described before electrical appliance, hummer is also reported to the police simultaneously, but shows the position positive ending grounding.
2, be provided with three protective devices in the circuit of the present utility model: one is overcurrent relay KC, for preventing that disconnected not the convincing by patient analysis of certain contact causes the protection that short circuit is established among contactor normally open contact KM1-1 and the KM2-1; Another is insurance RA, also is to prevent among contactor normally open contact KM1-1 and the KM2-1 that certain contact breaks not open short circuit and establishes; The 3rd is test resistance fan electromotor MD, and it mainly is to test resistance R heat radiation, prevents that test resistance R from crossing cause thermal damage.
1), in order to show conveniently 3, polymeter JK has following function:, has LCD liquid crystal display function, 2), programmable functions, 3), alternating current-direct current, voltage, current measurement function, 4), functions such as resistance, frequency, break-make, diode, temperature survey, 5), automatic range, automatically warning, automatic zero set (AZS), function such as outage and auto polarity demonstration automatically.Hummer is installed is realized automatic warning function.
Be described in detail below in conjunction with specific embodiment.
Fig. 2 is pure negativing ending grounding channel check judgment task principle, and as shown in the figure, its principle of work is that the A1 and the A2 termination of locomotive electric cad system line-to-ground somascope gone into locomotive 110V positive-negative power.A3 inserts locomotive car body (title earth point).When the locomotive circuit has negativing ending grounding, remove to measure the total negative terminal line of locomotive → each subregion negative terminal line → each branch road negative terminal line successively with the A4 current measurement probe SC of ground connection detector, when certain line has 1A or during greater than the variation of 1A electric current, illustrates that this circuit has earth point.How to judge earth point: at first use the A4 current measurement probe of somascope, the variation of measuring electric current according to the grounding circuit segmentation.As shown in this figure, 1A is arranged when the A4 solid line snaps into first point or, illustrate that earth point also in front greater than the electricity of 1A, when the A4 dotted line snaps into second point, no current or less than 1A proves earth point between first and second, its current path is+and end → A1 → polymeter JK → A3 → D1 → D2 →-end.
Fig. 3 is pure end ground connection channel check judgment task principle, and as shown in the figure, its principle of work is identical with Fig. 2, current measurement probe SC test that different is be positive terminal line, current path is :+end → D2 → D1 → A3 → polymeter JK → A2 →-hold.
Fig. 4 is an electrical appliance positive ending grounding channel check judgment task principle, and as shown in the figure, its principle of work is: the A1 of earth tester and A2 insert locomotive 110V positive-negative power, and A3 inserts locomotive car body (title earth point).When before the locomotive circuit has the electrical appliance anode, ground connection being arranged between after K switch, remove to measure this circuit with current measurement probe A 4.
Phenomenon one: K switch is being opened the position, and the second point is not have the electric current process, and the first point has the electric current process, but electric current is less than 1A, and its size of current depends on the internal resistance of electrical appliance, and internal resistance is big more, on the contrary electric current is more little or.Electric current can be greater than 1A in a word.Current path :+end → A1 → JK → A3 → D1 → D2 → R →-end.
Phenomenon two: K switch is being connected the position, and the second point has the electric current process greater than 1A, and the first point has only the electric current process of electrical appliance, so less than 1A.Current path :+end → K → D2 → D1 → A3 → JK → A2 →-end.
Main circuit ground connection is detected principle
Main circuit ground connection mainly is divided into: main Power Generation Road ground connection, main rectifier cabinet ground connection are also referred to as noble potential ground connection.Be exactly traction motor ground connection, resistive braking ground connection and other instrument protection circuit grounds in addition.Operation steps is as follows:
1, detects preceding preliminary work: (locomotive is under stopped status)
At first grounding switch is got to neutral position, check whether auxiliary circuit has positive and negative grounding phenomenon,, get rid of the ground connection of auxiliary circuit earlier if having.(mainly being to prevent in the circuit that 2 ground connection cause the generation of other fault) power condition switch is in the traction position.
2, judge it is ground connection behind preceding ground connection of main rectifier cabinet or the main rectifier cabinet earlier.Principle is that step is as follows with the unidirectional conduction of main rectifier cabinet, commutation diode:
1), connects a positive electricity and be connected on the output terminal of main rectifier cabinet to positive electricity of traction electric machine and resistive braking system from locomotive storage batteries.The negative electricity of locomotive storage batteries is connected on the power end of somascope, and the other end of somascope is connected on the car body of locomotive (title earth point).At this moment measure the six roots of sensation with somascope and draw big line, as do not have electric current to show, illustrate that this lateral circuit does not have grounding phenomenon.Otherwise measuring some circuit has electric current to show, prove that this circuit has earth point, at this moment main rectifier cabinet does not have positive electricity to pass through.
2), positive electricity that accumulator is added on the main rectifier cabinet takes off, and is connected on the negative terminal of accumulator, the negative terminal line of the somascope of accumulator end is taken off on the anode that is connected on accumulator.At this moment the commutation diode of main rectifier cabinet is a reverse-conducting.So the negative terminal of main rectifier cabinet has negative electricity, measure the big line of the six roots of sensation with somascope, as detect certain root line and have electric current to show, illustrate that this branch road has earth point.Do not have electric current to show as this six roots of sensation line, prove earth point not on electronegative potential, be noble potential ground connection.
3), find the grounding phenomenon of certain branch road, segmentation is measured again, up to earth point.
The foregoing description does not limit the utility model in any form, and all employings are equal to the technical scheme that mode obtained of replacement or equivalent transformation, all drop in the protection domain of the present utility model.
Claims (6)
1. locomotive electric cad system line-to-ground somascope, it is characterized in that comprising current measurement probe, polymeter, the signal feedback observation circuit, test resistance, time controller and testing button, described time controller is connected on the positive and negative two ends of circuit, in the control circuit of time controller, be in series with testing button, the outlet of time controller connects the coil of two contactors respectively, the normally open contact of two contactors is connected on respectively after the contact of time controller in the circuit, two normally open contacts are connected an end of test resistance jointly, the other end gang socket of test resistance; Between two normally open contacts and test resistance, connect signal feedback observation circuit, polymeter and current measurement probe successively.
2. locomotive electric cad system line-to-ground somascope according to claim 1 is characterized in that also being connected with LCDs on described signal feedback observation circuit.
3. locomotive electric cad system line-to-ground somascope according to claim 1 and 2 is characterized in that also being connected with hummer on described signal feedback observation circuit.
4. locomotive electric cad system line-to-ground somascope according to claim 1 is characterized in that being in series with overcurrent relay between the normally open contact of the contact of time controller in described circuit and contactor.
5. locomotive electric cad system line-to-ground somascope according to claim 1 is characterized in that being in series with insurance between the normally open contact of the contact of time controller in described circuit and contactor.
6. locomotive electric cad system line-to-ground somascope according to claim 1 is characterized in that also being connected with the test resistance fan electromotor in the outlet of described time controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201267074U CN201622315U (en) | 2010-02-05 | 2010-02-05 | Grounding detector for locomotive electric circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201267074U CN201622315U (en) | 2010-02-05 | 2010-02-05 | Grounding detector for locomotive electric circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201622315U true CN201622315U (en) | 2010-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201267074U Expired - Fee Related CN201622315U (en) | 2010-02-05 | 2010-02-05 | Grounding detector for locomotive electric circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201622315U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901316A (en) * | 2014-04-25 | 2014-07-02 | 株洲广丰电气有限公司 | Grounding monitoring device of locomotive air-conditioner system |
-
2010
- 2010-02-05 CN CN2010201267074U patent/CN201622315U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901316A (en) * | 2014-04-25 | 2014-07-02 | 株洲广丰电气有限公司 | Grounding monitoring device of locomotive air-conditioner system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20120205 |