CN204287375U - D.C. isolation observation circuit in lightning-proof header box - Google Patents
D.C. isolation observation circuit in lightning-proof header box Download PDFInfo
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- CN204287375U CN204287375U CN201420792240.5U CN201420792240U CN204287375U CN 204287375 U CN204287375 U CN 204287375U CN 201420792240 U CN201420792240 U CN 201420792240U CN 204287375 U CN204287375 U CN 204287375U
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- header box
- resistance assembly
- lightning
- circuit
- electromagnetic relay
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Abstract
The utility model provides the observation circuit of the D.C. isolation in a kind of lightning-proof header box; the electromagnetic relay comprising the operating resistance assembly that is arranged in parallel and peripheral protective resistance assembly and be connected with described peripheral protective resistance assembly with described operating resistance assembly respectively, described electromagnetic relay is communicated with ground connection.The utility model when header box both positive and negative polarity generation earth fault, can facilitate person on duty to detect and observes header box insulation.If header box generation earth fault, the utility model then can determine header box position by signal the very first time rapidly.
Description
Technical field
The utility model relates to a kind of observation circuit, the D.C. isolation observation circuit in especially a kind of lightning-proof header box.
Background technology
The effect of lightning-proof header box plays lightning protection effect to solar energy photovoltaic system.At present, bridge balance principle and low-frequency acquisition principle are mainly contained to the method for monitoring that insulate of the straight-flow system in lightning-proof header box.Wherein, be widely used according to the insulation monitoring and warning device that bridge balance principle realizes, but it can not detect the situation when insulation of straight-flow system positive and negative electrode declines on an equal basis; It is a kind of new method adopted in recent years by low-frequency acquisition principle detection of ground faults, but its stake resistance that can detect is by the restriction of straight-flow system distributed capacitance over the ground, and low-frequency ac signal is easily by extraneous interference, the low-frequency ac signal injected in addition increases the ripple coefficient of voltage of straight-flow system.Visible, all there is some defects being difficult to overcome in bridge balance principle and low-frequency acquisition principle.
Based on above-mentioned defect, be badly in need of a when header box both positive and negative polarity generation earth fault, the very first time determines the monitoring device of header box position rapidly by signal.
Summary of the invention
For the weak point existed in the problems referred to above, the utility model provides one can when header box both positive and negative polarity generation earth fault, and the very first time determines the D.C. isolation observation circuit in the lightning-proof header box of header box position rapidly by signal.
For achieving the above object, the utility model provides the observation circuit of the D.C. isolation in a kind of lightning-proof header box, the electromagnetic relay comprising the operating resistance assembly that is arranged in parallel and peripheral protective resistance assembly and be connected with described peripheral protective resistance assembly with described operating resistance assembly respectively, described electromagnetic relay is communicated with ground connection;
When short circuit or open circuit appear in operating resistance assembly, circuit will be communicated with ground connection, and electromagnetic relay produces magnetic field with failure judgement circuit.
D.C. isolation observation circuit in above-mentioned lightning-proof header box, wherein, described operating resistance assembly is made up of the operating resistance element that two are arranged in series.
D.C. isolation observation circuit in above-mentioned lightning-proof header box, wherein, described peripheral protective resistance assembly is made up of the peripheral resistive element that two are arranged in series.
Compared with prior art, the utility model has the following advantages:
The utility model when header box both positive and negative polarity generation earth fault, can facilitate person on duty to detect and observes header box insulation.If header box generation earth fault, the utility model then can determine header box position by signal the very first time rapidly.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Main Reference Numerals is described as follows:
The peripheral resistive element of 1-electromagnetic relay 2-operating resistance element 3-
Embodiment
As shown in Figure 1; the utility model provides the observation circuit of the D.C. isolation in a kind of lightning-proof header box; the electromagnetic relay 1 comprising the operating resistance assembly that is arranged in parallel and peripheral protective resistance assembly and be connected with peripheral protective resistance assembly with operating resistance assembly respectively, electromagnetic relay is communicated with ground connection.Wherein, operating resistance assembly is made up of the operating resistance element 2 that two are arranged in series, and peripheral protective resistance assembly is made up of the peripheral resistive element 3 that two are arranged in series.
When short circuit or open circuit appear in operating resistance assembly, circuit will be communicated with ground connection, and electromagnetic relay produces magnetic field with failure judgement circuit.
Principle of work of the present utility model is: if during lightning-proof header box generation both positive and negative polarity earth fault, false voltage makes electromagnetic relay excitation by earth terminal, electromagnetic relay often leaves node and closes ' close, the concurrent information that is out of order.
The utility model also has the following advantages:
(1) can in the operational process of electrical equipment Timeliness coverage insulation defect and developing accident potential, prevent trouble before it happens;
(2) progressively replace traditional power failure preventive trial, reduce the power off time of electrical equipment, save testing expenses;
(3) to old equipment or there will be a known defect, equipment with suspicion, its ruuning situation can be detected at any time, once pinpoint the problems, can be out of service in time, utilize the residual life of these equipment to greatest extent.
The foregoing is only preferred embodiment of the present utility model, is only illustrative for invention, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes in the spirit and scope that invention claim limits to it, amendment, even equivalence, but all will fall in protection domain of the present utility model.
Claims (3)
1. the D.C. isolation observation circuit in a lightning-proof header box, it is characterized in that, the electromagnetic relay comprising the operating resistance assembly that is arranged in parallel and peripheral protective resistance assembly and be connected with described peripheral protective resistance assembly with described operating resistance assembly respectively, described electromagnetic relay is communicated with ground connection;
When short circuit or open circuit appear in operating resistance assembly, circuit will be communicated with ground connection, and electromagnetic relay produces magnetic field with failure judgement circuit.
2. the D.C. isolation observation circuit in lightning-proof header box according to claim 1, is characterized in that, described operating resistance assembly is made up of the operating resistance element that two are arranged in series.
3. the D.C. isolation observation circuit in lightning-proof header box according to claim 1, is characterized in that, described peripheral protective resistance assembly is made up of the peripheral resistive element that two are arranged in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420792240.5U CN204287375U (en) | 2014-12-09 | 2014-12-09 | D.C. isolation observation circuit in lightning-proof header box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420792240.5U CN204287375U (en) | 2014-12-09 | 2014-12-09 | D.C. isolation observation circuit in lightning-proof header box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204287375U true CN204287375U (en) | 2015-04-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420792240.5U Active CN204287375U (en) | 2014-12-09 | 2014-12-09 | D.C. isolation observation circuit in lightning-proof header box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204287375U (en) |
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2014
- 2014-12-09 CN CN201420792240.5U patent/CN204287375U/en active Active
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