CN205280803U

CN205280803U - Current mutual inductor

Info

Publication number: CN205280803U
Application number: CN201521112220.XU
Authority: CN
Inventors: 马广岩; 罗晓光; 胡浩伟
Original assignee: Beijing Hengyuan Lichuang Electric Power Technology Co Ltd
Current assignee: Beijing Hengyuan Lichuang Electric Power Technology Co Ltd
Priority date: 2015-12-29
Filing date: 2015-12-29
Publication date: 2016-06-01
Anticipated expiration: 2025-12-29

Abstract

The utility model discloses a current mutual inductor aims at providing one kind and avoids current mutual inductor continuously to generate heat improving the current mutual inductor of security performance, solved the problem that current mutual inductor continuously generates heat, and its technical scheme main points are including the first mutual -inductor that has the the first signal output, have the 2nd signal output part's second mutual -inductor, signal output is carried out in the first signal output and the 2nd signal output part alternative, be equipped with temperature sensor between first mutual -inductor and the second mutual -inductor, temperature sensor is connected with switch switching circuit, switch switching circuit receives temperature sensor's signal and carry out switching output to the signal output of main mutual -inductor and vice mutual -inductor when the temperature exceedes the threshold value, has reached to avoid the effect of continuously generating heat, the utility model is suitable for an electric power device technical field.

Description

Current transformer

Technical field

This utility model relates to electrical device technical field, more specifically, it relates to a kind of adaptive switched current transformer.

Background technology

Current transformer principle is based on what transformer principle was made. Current transformer is made up of the iron core closed and winding. Finding by retrieving, the Chinese patent that application number is CN201510315907.1 discloses a kind of straight-through current transformer, and the Same Name of Ends of current transformer is at internal short circuit, external only one of which binding post. So, when high-voltage electric energy meter is examined and determine, current measurement circuit can with high pressure.

Current most of high-voltage great-current transformer outfans adopt the connection of terminals minor, at big electric current through out-of-date, it is easy to generate heat hot, it is easy to cause safety problem, it is therefore desirable to current transformer is carried out certain improvement.

Utility model content

For the deficiency that prior art exists, the purpose of this utility model is in that: provides a kind of and avoids current transformer persistent fever to improve the current transformer of security performance.

For achieving the above object, this utility model provides following technical scheme: a kind of current transformer, including first transformer with the first signal output part, there is the second transformer of secondary signal outfan, described first signal output part and secondary signal outfan are selected one and are carried out signal output, it is provided with temperature sensor between described first transformer and the second transformer, described temperature sensor is connected to switch on-off circuit, described switch on-off circuit receives the signal of temperature sensor and when temperature exceedes threshold value, the signal output of main transformer and secondary transformer is switched over output.

By above-mentioned setting, temperature sensor can detect the temperature of the first transformer, when the first transformer operation irregularity, too high phenomenon of generating heat occurs, the first transformer and the switching of the second transformer duty is carried out by switch on-off circuit, first transformer is disconnected, and quit work, second transformer is devoted oneself to work simultaneously, so that the first transformer can be flowed self-cooling by air, thus improve security performance, avoid the first transformer persistent fever, final initiating failure, the second transformer can be had to be operated replacement simultaneously, and then persistent fever amount can be effectively reduced when not stopping detecting.

Can be further arranged to as concrete scheme of the present utility model: described switch on-off circuit includes,

Signal in order to receive temperature sensor exports the comparing section of comparison signal with threshold value after comparing;

The enforcement division of switching action is carried out in order to receive comparison signal.

By above-mentioned setting, adopt comparing section to carry out carrying out comparing with threshold value to the analogue signal of temperature sensor output, such that it is able to be used for temperature out of range is defined, and carried out action by enforcement division, improve the response speed of signal.

Can being further arranged to as concrete scheme of the present utility model: described comparing section includes comparator and threshold value adjustment portion, the in-phase end of described comparator connects temperature sensor, and end of oppisite phase connects threshold value adjustment portion.

By above-mentioned setting, threshold value adjustment portion can effectively regulate the size of threshold value, consequently facilitating the adjustment that user is to the threshold size that temperature sets, adapts to different use environment thus improving.

Can be further arranged to as concrete scheme of the present utility model: described threshold value adjustment portion includes potentiometer and connects the reference power supply of potentiometer.

By above-mentioned setting, by the form of the electric resistance partial pressure to reference power supply, regulate change by the resistance of potentiometer, thus changing the voltage swing to the output of comparator end of oppisite phase, simple in construction, it is simple to regulate.

Can be further arranged to as concrete scheme of the present utility model: described enforcement division includes relay and audion, described relay has normal open switch contact and normally closed switch contact, the base stage of described audion connects the outfan of comparing section, the coil of collector connection relay, launching collection ground connection, the coil of relay is powered by power supply.

By above-mentioned setting, what adopt linkage has normal open switch contact and the relay of normally closed switch contact, such that it is able to be extremely rapidly performed by the first transformer and the switching of the second transformer.

Can be further arranged to as concrete scheme of the present utility model: described temperature sensor is also associated with exceeding the warning circuit of sounding warning during design temperature threshold value.

By above-mentioned setting, in order to improve security performance further, in the process that temperature raises occurs, there is restorability temperature raise, can irrecoverability temperature raise, undertaken temperature anomaly is warned by the form reported to the police, improving security performance, temperature anomaly situation can be known by staff in time, it is to avoid security incident.

Can be further arranged to as concrete scheme of the present utility model: described temperature sensor is critesistor or thermocouple device.

By above-mentioned setting, the cost of components and parts is cheaper, is suitable to market demands, and reduces the cost of the manufacturing.

Compared with prior art, the beneficial effects of the utility model are: temperature can be detected and automatically be carried out by temperature detection the duty switching between the first transformer and the second transformer, thus avoiding single transformer to work alone, persistence heats up, effectively the probability of the security incident that reduction causes due to temperature reason.

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model embodiment;

Fig. 2 is the circuit theory diagrams one of this utility model embodiment;

Fig. 3 is the switch on-off circuit part schematic diagram of this utility model embodiment;

Fig. 4 is the warning circuit schematic diagram of this utility model embodiment.

1, first signal output part in figure; 2, the first transformer; 3, secondary signal outfan; 4, the second transformer; 5, temperature sensor; 6, switch on-off circuit; 61, comparing section; A1, comparator; R2, potentiometer; Vref, reference power supply; 62, enforcement division; K1, relay; Q1, audion; K1-1, normally closed switch contact; K1-2, normal open switch contact; Vcc, power supply; 7, warning circuit; 71, comparison circuit; 72, buzzer circuit.

Detailed description of the invention

Below in conjunction with accompanying drawing, this utility model is described in further detail.

Embodiment one: such as Fig. 1, shown in 2, a kind of current transformer, including first transformer 2 with the first signal output part 1, there is the second transformer 4 of secondary signal outfan 3, described first signal output part 1 and secondary signal outfan 3 are selected one and are carried out signal output, it is provided with temperature sensor 5 between described first transformer 2 and the second transformer 4, described temperature sensor 5 is connected to switch on-off circuit 6, described switch on-off circuit 6 receives the signal of temperature sensor 5 and when temperature exceedes threshold value, the signal output of main transformer and secondary transformer is switched over output. this current transformer has two transformer bodies, for the ease of distinguishing, to be individually referred to as the first transformer 2 and the second transformer 4, switch on-off circuit 6 is arranged in the housing of bottom, specifically illustrates the main bindiny mechanism of its circuit theory and components and parts in Fig. 2,3,4.

As shown in Figure 2, normally closed switch contact K1-1 normal condition is Guan Bi, it is operated by the first transformer 2, the current signal of detection is exported, when temperature is too high time, being disconnected by normally closed switch contact K1-1, K1-2 Guan Bi in normal open switch contact realizes the switching of duty, now can pass through the second transformer 4 and carry out the detection output of high tension cable.

As it is shown on figure 3, described switch on-off circuit 6 includes, the signal in order to receive temperature sensor 5 exports the comparing section 61 of comparison signal with threshold value after comparing; The enforcement division 62 of switching action is carried out in order to receive comparison signal. Described comparing section 61 includes comparator A1 and threshold value adjustment portion, and the in-phase end of described comparator A1 connects temperature sensor 5, and end of oppisite phase connects threshold value adjustment portion. Described threshold value adjustment portion includes potentiometer R2 and connects the reference power supply Vref1 of potentiometer R2. Described enforcement division 62 includes relay K 1 and audion Q1, described relay K 1 has normal open switch contact K1-2 and normally closed switch contact K1-1, the base stage of described audion Q1 connects the outfan of comparing section 61, the coil of collector connection relay K1, launching collection ground connection, the coil of relay K 1 is powered by power Vcc. Temperature sensor 5 adopts the product on market, the output of signal can be simulated, the signal s of output inputs to comparator A1, that threshold value adjustment portion adopts is potentiometer R2R2, and reference power supply Vref1 is Vref1, and the power supply being connected with relay K 1 coil is Vcc, when temperature is too high, then the high level of comparator A1 output makes audion Q1 turn on, thus relay K 1 coil obtains electric, thus realizing the switch on the circuit in Fig. 2 is switched over.

As shown in Figure 4, described temperature sensor 5 is also associated with exceeding the warning circuit 7 of sounding warning during design temperature threshold value. Warning circuit 7 includes comparator A2, the in-phase end of comparator A2 connects temperature sensor 5 outfan, end of oppisite phase connects the second reference voltage V ref2, making temperature when exceeding certain limit, being namely equivalent to analogue signal s in circuit higher than reference voltage V ref2 is, output high level makes audion Q2 turn on, make buzzer Sp sounding alarm, after comparison circuit 71 compares, buzzer circuit 72 report to the police, improve security performance.

Temperature sensor 5 can detect the temperature of the first transformer 2, when the first transformer 2 operation irregularity, too high phenomenon of generating heat occurs, the switching of the first transformer 2 and the second transformer 4 duty is carried out by switch on-off circuit 6, first transformer 2 is disconnected, and quit work, second transformer 4 is devoted oneself to work simultaneously, so that the first transformer 2 can be flowed self-cooling by air, thus improve security performance, avoid the first transformer 2 persistent fever, final initiating failure, the second transformer 4 can be had to be operated replacement simultaneously, and then persistent fever amount can be effectively reduced when not stopping detecting.

Embodiment two: relative in above-described embodiment, described temperature sensor 5 is critesistor, adopts critesistor, and in its circuit design, components and parts is less costly, and the space that critesistor takies is also comparatively few.

Embodiment three: relative in above-described embodiment, for the position that temperature sensor 5 is arranged, any one in two transformers can be arranged at, in conjunction with above-mentioned embodiment, what adopt in embodiment one is provided on the first transformer 2, then can be arranged in the present embodiment on the second transformer 4.

The above is only preferred implementation of the present utility model, and protection domain of the present utility model is not limited merely to above-described embodiment, and all technical schemes belonged under this utility model thinking belong to protection domain of the present utility model. It should be pointed out that, for those skilled in the art, without departing from the some improvements and modifications under this utility model principle premise, these improvements and modifications also should be regarded as protection domain of the present utility model.

Claims

1. a current transformer, including first transformer (2) with the first signal output part (1), there is second transformer (4) of secondary signal outfan (3), it is characterized in that: described first signal output part (1) and secondary signal outfan (3) are selected one and carried out signal output, it is provided with temperature sensor (5) between described first transformer (2) and the second transformer (4), described temperature sensor (5) is connected to switch on-off circuit (6), described switch on-off circuit (6) receives the signal of temperature sensor (5) and when temperature exceedes threshold value, the signal output of main transformer and secondary transformer is switched over output.

2. current transformer according to claim 1, it is characterised in that: described switch on-off circuit (6) includes,

Signal in order to receive temperature sensor (5) exports the comparing section (61) of comparison signal with threshold value after comparing;

The enforcement division (62) of switching action is carried out in order to receive comparison signal.

3. current transformer according to claim 2, it is characterized in that: described comparing section (61) includes comparator (A1) and threshold value adjustment portion, the in-phase end of described comparator (A1) connects temperature sensor (5), and end of oppisite phase connects threshold value adjustment portion.

4. current transformer according to claim 3, it is characterised in that: described threshold value adjustment portion includes potentiometer (R2) and connects the reference power supply (Vref) of potentiometer (R2).

5. current transformer according to claim 2, it is characterized in that: described enforcement division (62) includes relay (K1) and audion (Q1), described relay (K1) has normal open switch contact (K1-2) and normally closed switch contact (K1-1), the base stage of described audion (Q1) connects the outfan of comparing section (61), the coil of collector connection relay (K1), launching collection ground connection, the coil of relay (K1) is powered by power supply.

6. current transformer according to claim 1, it is characterised in that: described temperature sensor (5) is also associated with exceeding the warning circuit (7) of sounding warning during design temperature threshold value.

7. current transformer according to claim 1, it is characterised in that: described temperature sensor (5) is critesistor or thermocouple device.