CN202737769U - High-voltage line suspension electricity-taking apparatus - Google Patents

Abstract

The high-voltage line suspension power-taking device of the utility model includes an electromagnetic circuit, a voltage control circuit, a protection circuit, a rectifier circuit, a filter circuit, and a voltage stabilizing circuit connected in sequence, the electromagnetic circuit includes a current transformer, and the voltage control circuit includes A bidirectional thyristor and a resistor; the bidirectional thyristor is connected in parallel to the secondary side of the current transformer, one end of the resistor is connected to the gate of the bidirectional thyristor, and the other end is connected to the bidirectional thyristor The T2 pole of the silicon to control the energy obtained from the primary side and the voltage on the secondary side. The whole circuit design is simple and practical, which improves the stability of the device and reduces the production cost. The shell is fully enclosed, which can adapt to various working environments. The transformer realizes electrical isolation, which improves the safety of the person and the device.

Description

A high-voltage line suspension power-taking device

【Technical field】

The utility model relates to an induction power-taking device, in particular to a high-voltage line induction power-taking device. the

【Background technique】

With the increase in the demand for online monitoring equipment for high-voltage lines, there are more and more suspended power-taking devices that supply power to them. These devices in the industry all have the problem that the power-taking circuit is too complicated, and the complexity of the circuit design will inevitably reduce the reliability of the device and increase the production cost. the

【Content of invention】

The utility model provides a high-voltage line suspension power supply device, which can provide a stable and practical high-voltage line voltage stabilization power supply solution, not only can better provide a stable DC power supply, but also simplifies the power supply circuit and improves the stability of the device. . the

The high-voltage line suspension power-taking device of the present invention includes an electromagnetic circuit, a voltage control circuit, a protection circuit, a rectifier circuit, a filter circuit, and a voltage stabilizing circuit connected in sequence, the electromagnetic circuit includes a current transformer, and the voltage control circuit includes A bidirectional thyristor and a resistor; the bidirectional thyristor is connected in parallel to the secondary side of the current transformer, one end of the resistor is connected to the gate of the bidirectional thyristor, and the other end is connected to the bidirectional thyristor The T2 pole of the silicon to control the energy obtained from the primary side and the voltage on the secondary side. the

As an embodiment, the current transformer is a split current transformer, which is divided into two symmetrical semi-annular iron cores, one side of which is wound with a wire, and the two output wires drawn out are connected to the protection circuit described above. the

As an embodiment, the protection circuit includes a piezoresistor and a transient suppression diode connected in parallel. the

As an embodiment, the rectification circuit is composed of a rectification bridge element. the

As an embodiment, the filter circuit includes a capacitor, and the capacitor has a function of storing energy. the

As an embodiment, the voltage stabilizing circuit includes a voltage stabilizing chip. the

As an embodiment, a supercapacitor is also included, and the supercapacitor is connected to the output terminal of the voltage stabilizing circuit for energy storage. the

The utility model obtains energy from the high-voltage line through a special current transformer; controls the energy obtained from the line through the shut-off function of the bidirectional thyristor, thereby controlling the voltage on the secondary side of the transformer; passes through the protection circuit and passes through rectification and filtering Then output; and then stabilize the filtered voltage through the voltage regulator chip, so as to output a stable voltage to supply power to the electrical equipment. Since the voltage of the capacitor in the filtering circuit and the input voltage in the voltage stabilizing circuit cannot exceed 20 volts, voltage control is particularly important. It is mentioned in many literatures that the control coil is connected in parallel to control the magnetic flux at high current to control the voltage. Although the method is feasible, it seems redundant and complicated. The utility model simplifies the control circuit: directly connect the bidirectional thyristor to the secondary side of the transformer, and then use the bidirectional thyristor to turn off the alternating current, when the induced voltage reaches enough to trigger the bidirectional thyristor conduction, The secondary side is directly turned on, and the energy from the primary side is stopped, so as to achieve the purpose of controlling the voltage. the

The closed ring open-close current transformer uses silicon steel sheet as the core material, and has a high magnetic field strength. When the cable is a small current of several amperes, it can induce a voltage that meets the requirements; at the same time, the open-close current transformer consists of upper and lower two Composed of two symmetrical ring iron cores, it has a closing function and is easy to install. the

The supercapacitor is used as the energy storage element of the circuit, which avoids the life problem of using lithium batteries; at the same time, when the high-voltage line is working normally, the supercapacitor is in the state of charging, and when the high-voltage line fails or the power is cut off Under the condition, the supercapacitor is converted into a power transmission state, which can play the role of power supply and ensure the reliable operation of electrical equipment. the

When the cable current fluctuates in a wide range, the power supply circuit can still output a stable DC voltage to ensure the reliable operation of the device. The working primary current tested in the laboratory is 10-1500 (amperes). Since the primary current that the laboratory can provide can only reach a maximum of 1500A, the device can still work normally at this time, so 1500 (ampere) is not the highest primary current that this device can work. the

The whole circuit design is simple and practical, which improves the stability of the device and reduces the production cost. The shell is fully enclosed, which can adapt to various working environments. The transformer realizes electrical isolation and improves the safety of people and devices. the

【Description of drawings】

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

Fig. 2 is a new circuit schematic diagram of the utility model. the

【Detailed ways】

Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing:

As shown in Figure 1, the utility model includes an electromagnetic circuit 1, a voltage control circuit 2, a protection circuit 3, a rectifier circuit 4, a filter circuit 5, and a voltage stabilizing circuit 6. In addition, as a preferred embodiment, a supercapacitor 7 can also be included . the

The electromagnetic circuit 1 includes a current transformer (as an embodiment, it can be a split current transformer, which is divided into two symmetrical semi-annular iron cores up and down, and a wire is wound on one side of the semi-annular iron core to lead out two output terminal wires , forming a current transformer, connected to the protection circuit, the split transformer is used to install on the high-voltage transmission line, and induces the required AC voltage and AC current), the current transformer is installed on the high-voltage transmission line, and the output terminal is connected to the voltage The control circuit 2, the output terminal of the voltage control circuit 2 is connected to the protection circuit 3, the output terminal of the protection circuit 3 is connected to the rectification circuit 4, the output terminal of the rectification circuit 4 is connected to the filter circuit 5, and the output terminal of the filter circuit 5 is connected to the stable Voltage circuit 6, supercapacitor 7 and voltage regulator circuit 6 output terminals are connected in parallel. the

The working principle is as follows: the current transformer is installed on the high-voltage transmission line, and the alternating magnetic field is generated by the power frequency current in the high-voltage transmission line. When overvoltage occurs, the protection circuit 3 acts to short-circuit the secondary side of the transformer, and then rectifies the voltage waveform through the rectifier circuit 4, and then obtains a relatively smooth waveform through the filter circuit 5, and then passes through The voltage stabilizing circuit 6 can obtain a stable DC voltage, and the supercapacitor 7 is connected to the output terminal of the stabilizing circuit 6 in parallel. When the high-voltage line is working normally, the supercapacitor is in a charged state, and when the high-voltage line fails or In the event of a power outage, the supercapacitor is converted into a power transmission state, which can play the role of power supply and ensure the reliable operation of electrical equipment. the

As a preferred embodiment, the utility model can also operate in parallel with a plurality of high-voltage line suspension power-taking devices in Fig. 1, and the output terminals of the power supplies are connected in parallel, so that a greater output power can be obtained. In addition, the utility model can also change the output voltage by changing the parameters. the

Fig. 2 is a circuit diagram of the utility model in a preferred embodiment. the

As an embodiment, the voltage control circuit 2 includes a bidirectional thyristor and a resistor. In the figure, the T1 and T2 poles of the bidirectional thyristor TRIAC are connected to both sides of the secondary side of the current transformer Trans Cup1, and one end of the resistor R1 is connected to the bidirectional thyristor TRIAC. The gate of the thyristor TRIAC is connected to the T2 pole of the bidirectional thyristor TRIAC. As an application example, the selected bidirectional thyristor model can be BTA41-600B. The maximum shut-off current is 40A, the maximum gate trigger current measured at 25 degrees Celsius is 50mA for the first, second and third quadrant triggers, and 100mA for the four-quadrant triggers. The resistance value of the optional resistor R1 is 500-15001000 ohms, and the difference of the resistance value of R1 will affect the magnitude of the gate current, and finally will affect the voltage magnitude of the secondary side of the current transformer. It should be noted that the model number of each device does not exclude other optional models. the

As an example, in the protection circuit 3 described above, the varistor ZOV and the transient suppression diode TVS are connected in parallel, which can better protect the circuit. Utilizing the non-linear characteristics of the varistor, when an overvoltage occurs between the two poles of the varistor, the varistor can set the voltage box at a relatively fixed voltage value, thereby realizing the protection of the subsequent circuit. When the instantaneous voltage exceeds the normal operating voltage of the circuit, an avalanche will occur, providing an ultra-low resistance path for the instantaneous current, and the instantaneous current is diverted through the transient suppression diode TVS to avoid the protected device. In the protection circuit 3, the piezoresistor is used as the first level of protection, and the transient suppression diode TVS is used as the latter level of protection. When the pulse voltage arrives, the transient suppression diode TVS starts first, and the instantaneous overvoltage can be precisely placed within a certain value; if the surge current is larger, the varistor ZOV starts to discharge the excess surge current. The protection circuit 3 is simple in design, low in cost, and combines the advantages of fast response time, low box voltage and large surge current capacity. the

As an embodiment, the rectification circuit 4 adopts a full-bridge rectification method. The input AC voltage and AC current pass through the rectification circuit formed by the rectification bridge, and are output at terminals "3" and "4" of the rectification circuit in Figure 2, and converted into DC voltage and DC current. As an application example, the model of the selected rectifier bridge can be KBPC608, the maximum reverse withstand voltage is 600V, the current is 6A, and the working range is -55°C to 125°C. But other optional models are not excluded. the

In the filter circuit 5, after passing through the filter capacitor C1, the circuit outputs a DC voltage and a DC current satisfying the ripple condition. As an example, considering the function of the filter capacitor to store energy, the selected filter capacitor C1 has a capacitance of 4700 microfarads. the

After passing through the filter circuit 5, a larger range of DC voltage is obtained, and the DC voltage will change due to changes in cable current and load. In order to obtain a stable DC output voltage, as a preferred embodiment, when designing the voltage stabilizing circuit 6, it may be considered to let the filtered voltage pass through a voltage stabilizing chip. The voltage stabilizing circuit may include a piezoresistor, a voltage stabilizing chip, and a resistor for regulating voltage. Considering the load capacity and its large input voltage range, after many comparisons, as a preferred embodiment, the voltage regulator chip of model LT1083 can be selected. LT1083 is an adjustable output voltage low dropout voltage regulator chip, of which 1.5V ≤(V _IN -V _OUT )≤25V, the maximum output current is 7.5A, which can meet the requirements.

The supercapacitor 7 is connected to the output terminal of the voltage stabilizing circuit in parallel. The supercapacitor C2 plays the role of auxiliary power supply in the circuit. When the cable works normally, the supercapacitor C2 absorbs too much energy. Next, the supercapacitor C2 sends energy to the control unit to ensure the normal operation of the electrical equipment for a period of time. As an application example, the selected capacitance of the supercapacitor C2 is 1pf. Many devices in the prior art are accustomed to using lithium batteries as the energy storage device of the device, but the effective service life of the lithium battery is limited, resulting in the trouble of having to replace the battery after a period of time. Aiming at this point, the utility model adopts the supercapacitor as the energy storage element. It is worth pointing out that the continuous power supply time after the line failure will be very short only if the supercapacitor is used. Continuously working online monitoring devices are no longer required. the

In order to more clearly reflect the remarkable effect of the utility model, Fig. 3-Fig. 6 are experimental waveform diagrams of the utility model. Among them: channel 1 measures the current of the high-voltage line simulated in the laboratory (for convenience of observation, not shown in the figure); channel 2 measures the voltage at both ends of the secondary side of the split current transformer. the

The voltage at both ends of the secondary side of the split current transformer is shown in Figure 3 to Figure 6 in the attached drawings. With the increase of the current, the voltage control circuit starts to work, and the voltage at both ends of the secondary side of the split current transformer is controlled at within the allowed range. The specific instructions are as follows:

As shown in Figure 3, the current of the high-voltage line is low at this time, the induced voltage on the secondary side of the transformer is low, and the bidirectional thyristor is in a disconnected state. the

As shown in Figure 4, at this time, the current of the high-voltage line gradually increases, the induced voltage on the secondary side of the transformer gradually increases, and the bidirectional thyristor is triggered to conduct, limiting excessive energy acquisition, and the maximum voltage on the secondary side gradually tends to be stable. Make sure the secondary side voltage is within the allowable range. the

As shown in Figures 5 and 6, the current of the high-voltage line continues to rise, and the conduction time of the bidirectional thyristor gradually increases, which further limits the energy acquisition and ensures that the secondary side voltage is within the allowable range. the

The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims. the

Claims (7)

1. high-tension line suspension electricity getting device, it is characterized in that, comprise the electromagnetic circuit, voltage control circuit, protective circuit, rectification circuit, filter circuit, the voltage stabilizing circuit that connect successively, described electromagnetic circuit comprises current transformer, and described voltage control circuit comprises bidirectional triode thyristor and resistance; Described bidirectional triode thyristor is connected to the secondary side of described current transformer, the gate pole of the described bidirectional triode thyristor of a termination of described resistance, and the T2 level of the described bidirectional triode thyristor of another termination is to control from the energy of primary side acquisition and the voltage of secondary side.

2. high-tension line suspension electricity getting device according to claim 1; it is characterized in that: described current transformer is open-close type current transformer; be divided into the up and down semi-circular iron core of two symmetries; wherein be wound with wire on the semi-circular iron core on one side, two wire of output terminal of drawing are connected in described protective circuit.

3. high-tension line suspension electricity getting device according to claim 1 and 2 is characterized in that: piezo-resistance and instantaneous twin zener dioder that described protective circuit comprises and connects.

4. high-tension line suspension electricity getting device according to claim 1, it is characterized in that: described rectification circuit is made of the rectifier bridge element.

5. high-tension line suspension electricity getting device according to claim 1, it is characterized in that: described filter circuit comprises electric capacity, described electric capacity is the electric capacity with function of storage power.

6. high-tension line suspension electricity getting device according to claim 1, it is characterized in that: described voltage stabilizing circuit comprises the voltage stabilizing chip.

7. high-tension line suspension electricity getting device according to claim 1, it is characterized in that: also comprise super capacitor, described super capacitor is connected with the output of described voltage stabilizing circuit, is used for energy reserve.

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