CN204761314U - Be applied to electric power supply unit that gets of cable worker well - Google Patents

Abstract

A power supply device for electric cable wells, including a three-way parallel power supply circuit, a DC/DC charging management circuit, a capacitor and a digital control chip; the output terminal of the power supply circuit is connected to the DC/DC charging management circuit and The control chip is connected; the digital control chip is connected with the DC/DC charging management circuit; each power-taking circuit includes a CT transformer, an impact protection circuit and a controllable rectification module connected in sequence, and the controllable rectification module is connected with the digital control chip; The capacitor is connected in parallel to the output terminal of the power-taking circuit. The utility model can not only effectively protect the power supply device and the submersible pump from being burned, but also prevent the normal operation of the submersible pump when the primary side current is insufficient or the power is cut off in the traditional method, so that the water accumulated in the well can be discharged normally. The application prospect is good and can bring higher economic benefits.

Description

A kind of electric power source device applied to electric cable well

technical field

The utility model relates to a power supply device in the technical field of electric power systems, in particular to a power supply device for taking electricity in cable wells.

Background technique

High-voltage transmission lines are divided into cable transmission lines and overhead transmission lines. For cable transmission lines buried in the ground, the interior of the well is prone to water accumulation due to flood seasons, and the lines are soaked in water, which affects the safe operation of cable equipment. Through submersible pumps Pumping and removing the accumulated water inside the well can solve this hidden danger. The traditional CT induction power acquisition uses the principle of electromagnetic induction to sense the current on the high-voltage side through the current transformer to obtain energy for the submersible pump. However, the traditional CT induction power acquisition The electric power supply is mainly used in the online monitoring link. Its power is too small to directly drive the submersible pump. The high-power CT induction power collection device poses a huge challenge to the iron core and coil. The technology is complicated and the cost is high; at the same time, the CT induction power collection device The device is easily affected by the current of the cable transmission line. When the current of the transmission circuit is insufficient or a power failure occurs, the submersible pump cannot work normally.

Utility model content

The main purpose of this utility model is to overcome the above-mentioned defects in the prior art, and propose a power supply device for electric cable wells, which can output high-power energy and directly drive a submersible pump to realize the drainage function.

The utility model adopts the following technical solutions:

A power supply device for electric cable wells, characterized in that it includes three parallel electric circuits, a DC/DC charging management circuit, a capacitor and a digital control chip; the output of the electric circuit is connected to the DC/DC The management circuit is connected to the digital control chip; the digital control chip is connected to the DC/DC charging management circuit; each power-taking circuit includes a CT transformer, an impact protection circuit and a controllable rectification module connected in sequence, and the controllable rectification module is connected to the digital The control chip is connected; the capacitor is connected in parallel to the output terminal of the power-taking circuit.

Preferably, the controllable rectification module includes a bidirectional thyristor and four diodes; the positive and negative poles of the four diodes are connected in sequence to form a rectification circuit, the input end of the rectification circuit is connected in parallel with the bidirectional thyristor, and the output end is connected in parallel with the capacitor and used as The output terminal of the power-taking circuit.

Preferably, the bidirectional thyristor adopts optocoupler MOC3081.

Preferably, the DC/DC charging management circuit adopts an isolated DC/DC converter, which is a flyback type, a forward type, or a half-bridge type or a full-bridge type.

Preferably, the DC/DC charging management circuit adopts a non-isolated DC/DC converter, which includes BUCK or BOOST or BUCK-BOOST or CUK or SEPIC or ZETA.

Preferably, it also includes a first switch and a second switch, the DC/DC charging management circuit is respectively connected to the submersible pump and the storage battery through the first switch and the second switch for power supply, and the digital control chip is connected to the first switch and the second switch. The two switches are connected to control on-off.

Preferably, the digital control chip adopts a DSP28027 processor.

As can be seen from the above description of the utility model, compared with the prior art, the utility model has the following beneficial effects:

The utility model effectively protects the safety of loads such as the induction power supply device, the rear submersible pump, and the storage battery through the impact protection circuit; under the same primary side current, the energy of 3 times the original power can be obtained through the parallel connection of the three-way power-taking circuit; The battery ensures the normal operation of the submersible pump when the high-voltage cable line is powered off or the current is insufficient; the digital control chip is used to realize the control of the circuit, which is conducive to the subsequent functions such as the collection of the environment (temperature, humidity, etc.) in the well and the transmission of GPRS data. expand. The designed circuit has stable performance and strong practicability, and has broad development and application prospects.

Description of drawings

Fig. 1 is a structural diagram of the utility model;

Fig. 2 is the schematic diagram of the utility model controllable rectification circuit;

Where: L1, L2, and L3 are CT transformers, C is a capacitor, D is a diode, SCR1 is a bidirectional thyristor, and S1 and S2 are respectively a first switch and a second switch.

Detailed ways

The utility model will be further described below through specific embodiments.

Referring to Fig. 1 and Fig. 2, a kind of power supply device for electric cable wells, including three-way parallel power fetching circuit, DC/DC charging management circuit, capacitor C1, digital control chip, first switch S1 and second Switch S2. Each power-taking circuit includes sequentially connected CT transformers (L1, L2, L3), an impact protection circuit and a controllable rectification module. The two output terminals of the CT transformer L1 are connected with the impact protection circuit, and the output terminals of the impact protection circuit are connected with the controllable rectification module. The output end of the controllable rectification module is used as the output end of the power-taking circuit. The three-way CT transformers L1, L2, and L3 are respectively installed on the three phases of the three-phase high-voltage cable transmission line. The output terminal of the power-taking circuit is connected in parallel with a capacitor C1 and outputs a stable DC voltage U1, which is charged with DC/DC The management circuit is connected with the digital control chip. The digital control chip is connected with the DC/DC charging management circuit, the first switch S1 and the second switch S2. Collect the output terminal voltage Uo and current I1, I2 of the DC/DC charging management circuit, and control the PWM signal in the DC/DC charging management circuit through Uo and I2, so as to control the three-stage charging of the battery, protect the battery, and prolong the service life of the battery. The capacitor C1 is connected in parallel to the output terminal of the power-taking circuit. The DC/DC charging management circuit is respectively connected to the submersible pump and the storage battery through the first switch S1 and the second switch S2 to supply power, and the digital control chip is connected to the first switch S1 and the second switch S2 to control on-off.

The controllable rectification module includes a bidirectional thyristor and four diodes D; the positive and negative poles of the four diodes D are connected in sequence to form a rectification circuit. The input end of the rectification circuit is connected in parallel with the bidirectional thyristor, and the output end is connected in parallel with the capacitor C1 as a power supply. circuit output. The two-way thyristor adopts optocoupler MOC3081. The controllable rectification module is connected with a digital control chip. The digital control chip samples the bus voltage U1 after the rectifier bridge and judges it. When the voltage U1 is higher than the set upper limit value, the triac SCR1 is triggered, and the secondary side current is short-circuited by the triac SCR1 to form a bypass loop. With the capacitor The energy stored in C1 is continuously released to the load, and the voltage U1 at both ends continues to drop. When its value is lower than the set lower limit, the bidirectional thyristor SCR1 is turned off. At this time, the secondary side current charges the capacitor C1 through the rectifier circuit, and at the same time, The subsequent load provides energy. By controlling the on-off of the bidirectional thyristor SCR1, the ratio of the rectification circuit and the bypass circuit is controlled, thereby stabilizing the bus voltage U1 within a certain range.

The CT transformer (including L1, L2, L3) of the present invention has an inner diameter of 120mm, a wake-up current of 20A, a maximum continuous working load current of 1000A, a power-current ratio greater than 0.14, an open-circuit voltage less than 60V, a rated primary current of 100A, and a rated power of 50W. The power supply voltage of the submersible pump is 24V, the rated power is 130W, the rated head is 10m, the rated flow rate is 8m ³ /h, and the outlet diameter is 25mm. The battery is two 12V, 20AH lead-acid batteries connected in series. The DC/DC charging management circuit adopts an isolated DC/DC converter, which is flyback or forward or half-bridge or full-bridge. The DC/DC charging management circuit adopts a non-isolated DC/DC converter, which includes BUCK or BOOST or BUCK-BOOST or CUK or SEPIC or ZETA.

The bus voltage U1 is stabilized at about 30V through the above-mentioned hysteresis control, and provides energy for two series-connected batteries and a submersible pump through a step-down (Buck) circuit. In the case of the same primary side current, compared with the single-channel CT induction power, the three-way CT power can get three times the power, and because the primary-side current phase angle difference is 120 degrees, the current of the three-way CT transformer is rectified and connected in parallel The frequency of the obtained DC power supply is three times that of the single-channel CT transformer, and the busbar ripple is smaller; the paralleled busbar voltage realizes the charging of the battery through the DC/DC charging management circuit on the one hand, and directly provides for the submersible pump on the other hand. Electric energy, when the current of the power transmission circuit is insufficient or a power failure occurs, the second switch S2 between the battery and the submersible pump is opened, and the battery provides the electric energy required by the submersible pump to ensure the normal drainage of the submersible pump. In order to solve the problem of common ground in the circuit and reduce the introduction of auxiliary power supply, the switching device in the Buck circuit adopts P-Mosfet. The signal from the single-chip microcomputer cannot directly drive the P-Mosfet, and it needs to be amplified by the triode to directly drive the P-Mosfet; Driven by MOC3081 optocoupler; the first switch and the second switch S1, S2 use JZC-33F relay.

The chip TPS54231 steps down to generate 3.3V as the power supply required by the DSP28027; the battery voltage and the bus voltage are sampled using the TL084 chip; the battery current is first converted from the current signal to a voltage signal by the ACS712-5A, and then connected to the single chip microcomputer for sampling through the op amp Digital sampling is realized at the interface.

The above is only a specific embodiment of the utility model, but the design concept of the utility model is not limited thereto, and any non-substantial modification of the utility model by using this concept should be an act of violating the protection scope of the utility model.

Claims (7)

1. A kind of electric power source device that is applied to the electric cable well, it is characterized in that: comprise three-way parallel electric circuit, DC/DC charging management circuit, electric capacity and digital control chip; This electric circuit output terminal and DC/DC The DC charging management circuit is connected to the digital control chip; the digital control chip is connected to the DC/DC charging management circuit; each power-taking circuit includes a CT transformer, an impact protection circuit and a controllable rectification module connected in sequence, and the controllable rectification module It is connected with the digital control chip; the capacitor is connected in parallel with the output terminal of the power-taking circuit. 2. A kind of power supply device applied to electric cable wells as claimed in claim 1, characterized in that: the controllable rectification module includes a bidirectional thyristor and four diodes; the positive and negative poles of the four diodes are connected in sequence A rectification circuit is formed, the input terminal of the rectification circuit is connected in parallel with the bidirectional thyristor, and the output terminal is connected in parallel with the capacitor and serves as the output terminal of the power-taking circuit. 3. A power supply device for electric cable wells as claimed in claim 2, characterized in that: the bidirectional thyristor adopts an optocoupler MOC3081. 4. A kind of electric power supply device applied to electric cable wells as claimed in claim 1, characterized in that: the DC/DC charging management circuit adopts an isolated DC/DC converter, which is a flyback or forward excited or half-bridge or full-bridge. 5. A power supply device for electric cable wells as claimed in claim 1, wherein the DC/DC charging management circuit adopts a non-isolated DC/DC converter, which includes BUCK or BOOST Type or BUCK-BOOST type or CUK type or SEPIC type or ZETA type. 6. A power supply device for electric cable wells as claimed in claim 1, characterized in that: it also includes a first switch and a second switch, and the DC/DC charging management circuit passes through the first switch and the second switch respectively. The second switch is connected with the submersible pump and the storage battery for power supply, and the digital control chip is connected with the first switch and the second switch for on-off control. 7. A power supply device for electric cable wells as claimed in claim 1, characterized in that: said digital control chip adopts a DSP28027 processor.