CN217656477U - Self-induction electricity taking device for transformer bushing tap monitoring - Google Patents

Abstract

The utility model discloses a self-induction power taking device used for monitoring the end screen of a transformer bushing, which relates to the technical field of transformers and comprises: a casing and a cover, the casing and the cover form a closed cavity, and a shielding compartment, a battery compartment and a battery compartment are arranged in the closed cavity. A power supply control compartment, a first induction coil and a second induction coil arranged up and down are arranged in the shielding compartment, a rechargeable battery is arranged in the battery compartment, and a power supply control module is arranged in the power supply control compartment; the side of the casing is provided with a first wiring port, The second connection port and the third connection port; the first connection port is arranged on the casing with the central axis of the first induction coil in the same straight line, the outer side of the second connection port is connected to the ground wire of the end screen, and the inner side of the second connection port passes through The coaxial line passes through the shielding chamber, the first induction coil and the second induction coil and is connected with the first wiring port. The utility model takes electricity from the induction coil through the grounding wire drawn from the end screen, the power supply mode is simple, the circuit structure is simple, and the practicability is good.

Description

Self-inductive power take-off device for monitoring transformer bushing end screen

technical field

The utility model relates to the technical field of transformers, in particular to a self-induction power taking device used for monitoring the end screen of a transformer bushing.

Background technique

Transformer oil has the functions of insulation, heat dissipation and arc suppression. In the daily maintenance of oil-immersed transformers, it is necessary to take oil samples of oil-immersed transformers frequently, and carry out various experiments on the transformer oil to analyze whether the transformer oil is qualified and whether the indicators of the transformer oil are normal. This is a guarantee An effective means for the transformer to operate safely.

Substation casing end screen monitoring is used for temperature, pressure, hydrogen content, partial discharge current, UHF current, etc. The power supply of monitoring devices is generally combined with battery and solar power supply, but the monitoring of hydrogen content is performed by a single hydrogen sensor , and the single hydrogen sensor needs a large voltage, and the general battery and solar power supply are not enough to support the power consumption of the single hydrogen sensor, and the frequent replacement of the battery also increases the maintenance work.

Therefore, how to continuously provide the working voltage for the end shield of the transformer bushing has become an urgent technical problem to be solved by those skilled in the art.

Utility model content

In order to solve the above-mentioned deficiencies of the prior art, the present invention provides a self-inductive power taking device for monitoring the end screen of a transformer bushing, which does not need to replace the battery, and realizes power supply through inductive power taking.

The technical scheme proposed by the utility model is:

Self-inductive power take-off device for monitoring the end screen of transformer bushing, including:

A casing and a cover, the casing and the cover form a closed cavity, a shielding compartment, a battery compartment and a power control compartment are arranged in the closed cavity, and a first induction coil and a second induction coil arranged up and down are arranged in the shielding compartment. , a rechargeable battery is arranged in the battery compartment, and a power control module is arranged in the power control compartment;

A first wiring port, a second wiring port and a third wiring port are arranged on the side of the housing; the first wiring port is arranged on the housing whose central axis of the first induction coil is in the same straight line, and the second wiring port The outer side of the port is connected to the end screen ground wire, and the inner side of the second connection port passes through the shielding chamber, the first induction coil and the second induction coil through a coaxial wire and is connected to the first connection port;

The output end of the first induction coil is connected to the power control module, the output end of the second induction coil is used to connect the dielectric loss sensor, the power control module is connected to the rechargeable battery, and the output end of the power control module Connect the third wiring port.

As a further technical solution of the present invention, the power control module includes a test switch, a rectifier circuit, a voltage regulator circuit, a filter circuit, and a DC-DC conversion circuit, the test switch is connected in parallel with the input end of the rectifier circuit, and the rectifier circuit is connected in parallel. The output end of the circuit is connected to the voltage stabilization circuit, the output end of the voltage stabilization circuit is connected to the filter circuit, and the output end of the filter circuit is connected to the DC-DC conversion circuit.

As a further technical solution of the present invention, the test switch is a vacuum circuit breaker of the Sip-hv-1a-d model, the rectifier circuit adopts a rectifier bridge of the DB207S model, and the DC-DC conversion circuit adopts a model of PV15 -27BxxR3 ultra-wide voltage input DC/DC power supply module.

As a further technical solution of the present invention, the power control module further includes a charge and discharge management circuit, and the output end of the charge and discharge management circuit is connected to a rechargeable battery.

As a further technical solution of the present invention, the charge and discharge management circuit adopts a lithium battery charge management chip of the CN3795 model.

As a further technical solution of the present invention, the first connection port is a two-core air plug interface, the second connection port is a four-core air plug interface, and the third connection port is a four-core air plug interface.

As a further technical solution of the present invention, the housing is provided with mounting screw holes, the cover body is provided with mounting holes, and the cover body and the housing are fixedly connected by bolts.

As a further technical solution of the present invention, a sealing ring is arranged between the casing and the cover.

The beneficial effects of the present utility model are:

1. The utility model does not need to configure a power supply by setting up a self-inductive power taking device. The induction coil takes power through the ground wire drawn from the end screen to supply power to the transformer bushing end screen monitoring device. The power supply method is simple and can be charged by setting The battery realizes the electric energy storage of the coil inductive power, and the power control module converts the electric energy induced by the coil to provide the current and voltage values required by the monitoring device.

2. In the embodiment of the present invention, the casing and the cover form a closed cavity, which provides an installation environment for the rechargeable battery, the power control module and the induction coil.

3. A shielding compartment for installing the induction coil is arranged inside the casing, which is separated from the battery compartment and the power control compartment. The induction coil includes a second induction coil for monitoring the dielectric loss signal of the ground wire of the end screen and a second induction coil for taking electricity. Induction coil, the ground wire drawn from the end screen penetrates into the shielding chamber from the first wiring port, and then leads out from the second wiring port. The output end of the first induction coil is connected to the power control module, and the power is converted and stored in the rechargeable battery. .

4. The power-taking process and the monitoring process are set separately. Therefore, the power-taking control is performed by setting the test switch, and the booster circuit is controlled to convert the large-voltage equipment of the monitoring device into a usable voltage through the booster circuit. The circuit structure is simple and practical. it is good.

Description of drawings

Fig. 1 is the structure diagram of the self-induction power taking device for monitoring the end screen of transformer bushing proposed by the utility model;

Fig. 2 is the front view of the self-induction power taking device proposed by the utility model for monitoring the end screen of the transformer bushing;

Fig. 3 is the B-B sectional view of the self-induction power taking device for monitoring the end screen of the transformer bushing proposed by the utility model;

4 is a sectional view C-C of a self-induction power taking device for monitoring the end screen of a transformer bushing proposed by the utility model;

Fig. 5 is the circuit block diagram of the power supply control module proposed by the utility model;

6 is a circuit diagram of a power supply control module proposed by the utility model;

Fig. 7 is the DC-DC conversion circuit diagram proposed by the utility model;

Fig. 8 is the charging and discharging management circuit diagram proposed by the utility model;

Shown in the picture:

100-shell, 200-cover, 300-first induction coil, 400-second induction coil, 500-rechargeable battery, 600-power control module;

101-shielding compartment, 102-battery compartment, 103-power control compartment, 104-first wiring port, 105-second wiring port, 106-third wiring port, 107-installation screw holes;

201- mounting hole;

601- test switch, 602- rectifier circuit, 603- voltage regulator circuit, 604- filter circuit, 605- DC-DC conversion circuit, 606- charge and discharge management circuit.

Detailed ways

The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all It belongs to the scope of protection of the present invention.

Referring to Figure 1 and Figure 4, the self-induction power taking device for monitoring the end screen of transformer bushing includes:

The casing 100 and the cover 200, the casing 100 and the cover 200 form a closed cavity, and a shielding compartment 101, a battery compartment 102 and a power control compartment 103 are arranged in the closed cavity. an induction coil 300 and a second induction coil 400, a rechargeable battery 500 is arranged in the battery compartment 102, and a power control module 600 is arranged in the power control compartment 103;

A first wiring port 104 , a second wiring port 105 and a third wiring port 106 are arranged on the side of the housing 100 ; the first wiring port 104 is arranged on the housing 100 where the central axis of the first induction coil 300 is in the same straight line The outer side of the second wiring port 105 is connected to the end-screen ground wire, and the inner side of the second wiring port 105 passes through the shielding chamber 101, the first induction coil 300 and the second induction coil 400 through a coaxial cable and is connected with the first induction coil 400. A wiring port 104 is connected;

The output end of the first induction coil 300 is connected to the power supply control module 600, the output end of the second induction coil 400 is used to connect the dielectric loss sensor, the power supply control module 600 is connected to the rechargeable battery 500, the power supply The output end of the control module 600 is connected to the third wiring port 106 .

In the embodiment of the present utility model, by setting up the self-induction power taking device, no additional power supply is required, and the induction coil takes power through the ground wire drawn from the end screen to supply power to the monitoring device for the end screen of the transformer bushing. The rechargeable battery realizes the electric energy storage of the coil inductively taking electricity, and converts the electric energy that the coil inductively takes electricity through the power control module to provide the current and voltage values required by the monitoring device. A closed cavity is formed to provide an installation environment for rechargeable batteries, power control modules and induction coils. It can be fixed on the casing through the casing, and can be fixed by mounting bolts or flanges. The specific installation structure is subject to the on-site construction design. .

A shielding compartment for installing the induction coil is arranged inside the housing, which is separated from the battery compartment and the power control compartment. The induction coil includes a second induction coil for monitoring the dielectric loss signal of the ground wire of the end screen and a second induction coil for taking electricity. , the ground wire drawn from the end screen penetrates into the shielding chamber from the first wiring port, and then leads out from the second wiring port. The output end of the first induction coil is connected to the power control module for power conversion and stored in the rechargeable battery.

5 to 8 , in the embodiment of the present invention, the power control module 600 includes a test switch 601, a rectifier circuit 602, a voltage regulator circuit 603, a filter circuit 604, and a DC-DC conversion circuit 605. The test switch 601 is connected in parallel with The input end of the rectifier circuit 602 is connected to the voltage stabilizer circuit 603 at the output end of the rectifier circuit 602 , the output end of the voltage stabilizer circuit 603 is connected to the filter circuit 604 , and the output end of the filter circuit 604 is connected to the DC-DC conversion circuit 605 .

In the specific monitoring process, the power-taking process and the monitoring process are set separately, so the power-taking control is performed by setting the test switch. When monitoring is required, the control test switch is closed. At this time, the power-taking circuit is partially short-circuited, and the power-taking circuit is not When working, when monitoring is not required, the control test switch is turned off. At this time, the coil is induced to take power, and the booster circuit is controlled. The large voltage equipment of the monitoring device is converted into a usable voltage through the booster circuit. The circuit structure is simple and practical. it is good.

Among them, the test switch 601 is a vacuum circuit breaker of type Sip-hv-1a-d, the rectifier circuit 602 adopts a rectifier bridge of type DB207S, and the DC-DC conversion circuit 605 adopts an ultra-wide voltage input DC/DC power supply of type PV15-27BxxR3 module.

The power control module 600 further includes a charge and discharge management circuit 606 , and the output end of the charge and discharge management circuit 606 is connected to the rechargeable battery 500 . Among them, the charge and discharge management circuit 606 adopts the CN3795 lithium battery charge management chip. The rechargeable battery adopts rechargeable lithium battery.

In the embodiment of the present invention, the first wiring port 104 is a two-core aerial plug interface, the second wiring port 105 is a four-core aerial plug interface, and the third wiring port 106 is a four-core aerial plug interface, which has a simple installation structure and good sealing performance. .

In the embodiment of the present invention, the housing 100 is provided with mounting screw holes 107, the cover body 200 is provided with mounting holes 201, and the cover body 200 and the housing 100 are fixedly connected by bolts. To ensure airtightness, a sealing ring is provided between the casing 100 and the cover body 200 .

The present utility model has been described in detail above, but the present utility model is not limited to the above-mentioned embodiments, and various changes can be made within the scope of knowledge possessed by those of ordinary skill in the art without departing from the purpose of the present utility model. Numerous other changes and modifications may be made without departing from the spirit and scope of the present invention. It should be understood that the present invention is not limited to specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims (8)

1. A get electric installation from induction for monitoring of transformer bushing end screen, its characterized in that includes:

the battery comprises a shell and a cover body, wherein the shell and the cover body form a closed cavity, a shielding bin, a battery bin and a power supply control bin are arranged in the closed cavity, a first induction coil and a second induction coil which are arranged up and down are arranged in the shielding bin, a rechargeable battery is arranged in the battery bin, and a power supply control module is arranged in the power supply control bin;

a first wiring port, a second wiring port and a third wiring port are arranged on the side edge of the shell; the first wiring port is arranged on the shell with the central axis of the first induction coil in the same straight line, the outer side of the second wiring port is connected with the end screen grounding wire, and the inner side of the second wiring port penetrates through the shielding bin, the first induction coil and the second induction coil through the coaxial line and is connected with the first wiring port;

the output end of the first induction coil is connected with the power supply control module, the output end of the second induction coil is used for being connected with the dielectric loss sensor, the power supply control module is connected with the rechargeable battery, and the output end of the power supply control module is connected with the third wiring port.

2. The self-induction power taking device for transformer bushing tap monitoring as claimed in claim 1, wherein the power control module comprises a test switch, a rectifying circuit, a voltage stabilizing circuit, a filter circuit and a DC-DC converting circuit, the test switch is connected in parallel with an input end of the rectifying circuit, an output end of the rectifying circuit is connected with the voltage stabilizing circuit, an output end of the voltage stabilizing circuit is connected with the filter circuit, and an output end of the filter circuit is connected with the DC-DC converting circuit.

3. The self-induction electricity taking device for transformer bushing tap monitoring of claim 2, wherein the test switch is a Sip-hv-1a-d type vacuum circuit breaker, the rectifier circuit adopts a DB207S type rectifier bridge, and the DC-DC conversion circuit adopts an ultra-wide voltage input DC/DC power module of PV15-27BxxR3 type.

4. The self-induction power taking device for transformer bushing tap monitoring according to claim 1, wherein the power control module further comprises a charge and discharge management circuit, and an output end of the charge and discharge management circuit is connected with a rechargeable battery.

5. The self-induction electricity taking device for transformer bushing tap monitoring according to claim 4, wherein the charge and discharge management circuit is a CN3795 type lithium battery charge management chip.

6. The self-induction electricity taking device for transformer bushing tap monitoring of claim 1, wherein the first wiring port is a two-core aerial socket interface, the second wiring port is a four-core aerial socket interface, and the third wiring port is a four-core aerial socket interface.

7. The self-induction electricity taking device for monitoring the tap screen of the transformer bushing according to claim 1, wherein the housing is provided with mounting screw holes, the cover body is provided with mounting holes, and the cover body is fixedly connected with the housing through bolts.

8. The self-induction electricity taking device for transformer bushing tap monitoring according to claim 1, wherein a sealing ring is arranged between the shell and the cover body.

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