CN201804068U

CN201804068U - Analog self-checking circuit

Info

Publication number: CN201804068U
Application number: CN2010205647867U
Authority: CN
Inventors: 黄冬来
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-14
Filing date: 2010-10-14
Publication date: 2011-04-20
Anticipated expiration: 2020-10-14

Abstract

The utility model relates to an analog self-checking circuit of a current transformer. One end of a transformer detecting circuit is connected with a relay switch circuit, the other end of the transformer detecting circuit is connected with a signal output circuit, a control end signal is transmitted to the signal output circuit via the relay switch circuit, high and low levels of the signal output circuit are adopted as detection and judgment basis of coils in the transformer, and the analog self-checking circuit which is added on a transformer acquisition circuit can judge fault detection such as break-make, short circuit and the like of the coils of the transformer at real time. The analog self-checking circuit is applied to the transformer acquisition circuit, generates analog self-checking signals at variable time intervals, and achieves judgment effect.

Description

A kind of simulation self-checking circuit

Technical field

The utility model relates to a kind of simulation self-checking circuit of current transformer.

Background technology

Current transformer is widely used, and is main in the measurement of power current and the collection of data, judges phenomena of the failure such as short circuit, overcurrent, in the course of the work, when fault such as break-make, short circuit occurring when current transformer, will produce grave error and judge.

The utility model content

The purpose of this utility model provides the simulation self-checking circuit of fault detects such as a kind of break-make, short circuit of real-time judge mutual inductor coil.

The technical scheme that the utility model adopted is such: a kind of simulation self-checking circuit, end by the mutual inductor testing circuit connects relay switching circuit, an other end of mutual inductor testing circuit connects signal output apparatus, and the control end signal is delivered to signal output apparatus through relay switching circuit.

The high-low level of described signal output apparatus detects basis for estimation as the mutual inductor Inside coil.

By adopting the aforementioned techniques scheme, the beneficial effects of the utility model are: increase the simulation self-checking circuit on the mutual inductor Acquisition Circuit, but the simulation self-checking circuit of fault detects such as the break-make of real-time judge mutual inductor coil, short circuit, the simulation self-checking circuit is used the mutual inductor Acquisition Circuit, carry out not timing and produce the simulation self-test signal, reach the effect of judgement.

Description of drawings

Fig. 1 is the frame assumption diagram of the utility model embodiment;

Fig. 2 is the circuit diagram of the utility model embodiment.

Embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, a kind of simulation self-checking circuit, end by mutual inductor testing circuit 1 connects relay switching circuit 2, an other end of mutual inductor testing circuit 1 connects signal output apparatus 3, control end 4 signals are delivered to signal output apparatus 3 through relay switching circuit 2, and the high-low level of described signal output apparatus 3 detects basis for estimation as the mutual inductor Inside coil.

As shown in Figure 2, the end of mutual inductor LN is connected in normally closed some J1-1 of relay, J1-2 ground connection, when relay J 1 not adhesive, J1-1 and J1-2 are on-state, when the A point is low level, relay J 1 adhesive, J1-1 and J1-3 connect, and J1-2 disconnects, and J1-1 connects analog voltage signal at this moment, this signal through the LN Inside coil through R1 to the R2 dividing potential drop, again after clamped circuit of diode D1, D2 and capacitor C 1 filtering, by resistance R 3 series diode D3 rectifications, parallel resistance R4 current limliting, output signal T0.

More than show and described ultimate principle of the present utility model and principal character and advantage thereof; the technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the explanation just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1. simulate self-checking circuit for one kind, it is characterized in that: the end by mutual inductor testing circuit (1) connects relay switching circuit (2), an other end of mutual inductor testing circuit (1) connects signal output apparatus (3), and control end (4) signal is delivered to signal output apparatus (3) through relay switching circuit (2).

2. a kind of simulation self-checking circuit according to claim 1 is characterized in that: the high-low level of described signal output apparatus (3) detects basis for estimation as the mutual inductor Inside coil.