CN203455390U

CN203455390U - An openable DC leakage current sensor

Info

Publication number: CN203455390U
Application number: CN201320588333.1U
Authority: CN
Inventors: 项观养
Original assignee: ZHUHAI ZHONGRUI SCIENCE & TECHNOLOGY Co Ltd
Current assignee: ZHUHAI ZHONGRUI SCIENCE & TECHNOLOGY Co Ltd
Priority date: 2013-09-23
Filing date: 2013-09-23
Publication date: 2014-02-26
Anticipated expiration: 2023-09-23

Abstract

The embodiment of the utility model discloses an openable DC leakage current sensor comprising an iron core, a DC leakage current detecting circuit carried on the iron core, an annular shield sleeved on the outer wall of the iron core, and a housing used for supporting the iron core and the annular shield. The iron core and the housing are both openable iron cores. The DC leakage current detecting circuit comprises an oscillation magnetic modulation loop circuit, a fast filter loop circuit, a proportional amplifying circuit, and an integration no-difference regulation amplifying circuit which are successively connected in series. The oscillation magnetic modulation loop circuit comprises a first operational amplifier and a primary coil wound around the iron core. Under the circumstance of not powering off, the openable DC leakage current sensor is capable of directly reconstructing or repairing a DC power system or an electric device.

Description

Opening and closing type DC leakage current sensor

Technical field

The utility model relates to a kind of DC leakage current sensor, relates in particular to a kind of opening and closing type DC leakage current sensor.

Background technology

DC leakage current sensor, around being arranged in the positive and negative outlet of DC loop, when device operation, detect in real time the signal of each branch sensor output, when branch road insulation situation is normal, the size of current of flows through sensor equates, opposite direction, its output signal is zero; When branch road has ground connection, leakage current sensor has poor stream to flow through, and the output of sensor is non-vanishing.Therefore by detecting the output signal of each branch sensor, just can judge DC system grounding branch road.This principle route selection precision is high, is not subject to the impact of line distribution capacitance.But in actual use procedure, if need to transform DC power system or consumer, need after this DC power system or consumer power-off, could to operate, main equipments such as transformer station's one class for some still, power-off meeting causes very large impact or loss.

Summary of the invention

Technical problem to be solved in the utility model is, a kind of opening and closing type DC leakage current sensor is provided, and can, the in the situation that of not power-off, directly DC power system or consumer be transformed or be keeped in repair.

In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of opening and closing type DC leakage current sensor, comprise the DC leakage current testing circuit being loaded with on iron core, described iron core, the ring shielding that is enclosed within described iron core outer wall and for supporting the housing of described iron core and ring shielding, described iron core and described housing are all opening and closing type iron core.

For the improvement of technique scheme, described DC leakage current testing circuit comprises oscillating magnetic flux modulator loop in sequential series, fast electric-wave filter loop, ratio amplifying circuit and integration non differential regulation amplifying return circuit.

For the further improvement of technique scheme, described oscillating magnetic flux modulator loop comprises the first operational amplifier and around the primary winding on described iron core.

For the further improvement of technique scheme, described integration non differential regulation amplifier circuit comprises integral operation amplifier and around the secondary coil on described iron core.

Implement the utility model embodiment, there is following beneficial effect:

Opening and closing type DC leakage current sensor described in the utility model, can not only detect the leakage current of 10mA, can also utilize the iron core of opening and closing type, make without power-supply system or consumer power-off can be completed to transformation or maintenance, solve impact or loss because causing in power process, greatly improved transformation efficiency.This simplicity of design simultaneously, cost is low.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, does not form to improper restriction of the present utility model, in the accompanying drawings:

The structured flowchart of a kind of opening and closing type DC leakage current sensor that Fig. 1 provides for the utility model embodiment;

The structural representation of a kind of opening and closing type DC leakage current sensor that Fig. 2 provides for the utility model embodiment under open mode;

The structural representation of a kind of opening and closing type DC leakage current sensor that Fig. 3 provides for the utility model embodiment under closure state;

The structure principle chart of a kind of opening and closing type DC leakage current sensor that Fig. 4 provides for the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment, describe the utility model in detail, in this illustrative examples of the present utility model and explanation, be used for explaining the utility model, but not as to restriction of the present utility model.

Embodiment:

As Fig. 1, Fig. 2, shown in Fig. 3 and Fig. 4, opening and closing type DC leakage current sensor described in the utility model, comprise iron core 1, DC leakage current testing circuit 2, ring shielding 3 and housing 4, described direct current electric-leakage detection circuit 2 is loaded on described iron core 1, described ring shielding 3 is placed on described iron core 1 outer wall, be used for playing shielding action, and described iron core 1 and described ring shielding 3 are all opening and closing type structure, be convenient in access DC power system or consumer, can the in the situation that of not power-off, the comprehensive consumer in described DC power system lake be transformed or be keeped in repair.4 of described housings, for described iron core 1 and described ring shielding 3 are supported, make its firm placement.

Wherein, described DC leakage current testing circuit 2 comprises oscillating magnetic flux modulator loop 5 in sequential series, fast electric-wave filter loop 6, ratio amplifying circuit 7 and integration non differential regulation amplifying return circuit 8, described oscillating magnetic flux modulator loop 5 comprises the first operational amplifier 9 and around the primary winding 10 on described iron core 1, and described integration non differential regulation amplifier circuit 8 comprises integral operation amplifier 11 and around the secondary coil 12 on described iron core 1.Described oscillating magnetic flux modulator loop 5 is also magnetizing coil as excited signal source at primary winding 10() in produce square-wave signal, when there is DC leakage current in detected circuit 13, this DC leakage current can produce direct current offset magnetic potential in described iron core 1, the square-wave signal in described primary winding 10 is subject to the impact of direct current offset magnetic potential and asymmetric skew (being modulated process) occurs, and then by described fast electric-wave filter loop 6, is filtered AC signal and is retained the output d. c. voltage signal (be demodulating process) relevant with direct current offset magnetic potential size and Orientation.In order to coordinate rearmounted output or the needed voltage swing of display circuit, through described ratio amplifying circuit 7, amplify and process again, acquisition form is d. c. voltage signal, finally by described integration non differential regulation amplifier circuit 8, under the effect of integral operation amplifier 11 and secondary coil 12, draw required voltage, this d. c. voltage signal size is proportional to DC leakage current size and direction with direction.

Opening and closing type DC leakage current sensor described in the utility model has the function of opening and closing type, in the time need to transforming such as this type of consumer of transformer station, but equipment can not the situation of power-off under, the utility model just can utilize the function that it can folding, be convenient to greatly existing DC leakage current sensor installing, after iron core closure, can also measure accurately the existence that whether has leakage current.To transformer station, provide convenient, fast, transformation service accurately, and without electricity consumption facility being brought to the trouble of power failure.

The technical scheme above the utility model embodiment being provided is described in detail, applied specific case herein the principle of the utility model embodiment and embodiment are set forth, the explanation of above embodiment is only applicable to help to understand the principle of the utility model embodiment; , for one of ordinary skill in the art, according to the utility model embodiment, in embodiment and range of application, all will change, in sum, this description should not be construed as restriction of the present utility model meanwhile.

Claims

1. an opening and closing type DC leakage current sensor, comprise the DC leakage current testing circuit (2) being loaded with on iron core (1), described iron core (1), the ring shielding (3) that is enclosed within described iron core (1) outer wall and for supporting the housing (4) of described iron core (1) and ring shielding (3), it is characterized in that:

Described iron core (1) and described housing (4) are all opening and closing type iron core.

2. opening and closing type DC leakage current sensor according to claim 1, is characterized in that:

Described DC leakage current testing circuit (2) comprises oscillating magnetic flux modulator loop (5) in sequential series, fast electric-wave filter loop (6), ratio amplifying circuit (7) and integration non differential regulation amplifying return circuit (8).

3. opening and closing type DC leakage current sensor according to claim 2, is characterized in that:

Described oscillating magnetic flux modulator loop (5) comprises the first operational amplifier (9) and around the primary winding (10) on described iron core (1).

4. opening and closing type DC leakage current sensor according to claim 2, is characterized in that:

Described integration non differential regulation amplifier circuit (8) comprises integral operation amplifier (11) and around the secondary coil (12) on described iron core (1).