CN110221133B - Rapid phasing device for high-voltage line of power system and application method of rapid phasing device - Google Patents

Abstract

The present invention discloses a fast phase-determining device for a high-voltage line of an electric power system, comprising a shell, an excitation component and a feedback component arranged in the shell, the excitation component comprising a DC high-voltage module and an output channel switching module, the input end of the output channel switching module is connected to the DC high-voltage module, the output end of the output channel switching module is connected to one end of each phase of the high-voltage line, the feedback component comprises a current measuring module, a processor and a data output module, the input end of the current detection module is connected to an earth return line, the output end of the current detection module is connected to the input end of the processor, and the output end of the processor is connected to the data output module; the present invention also discloses a method for using the above-mentioned fast phase-determining device for a high-voltage line of an electric power system. Compared with the existing insulation resistance meter, the device of the present invention improves the working efficiency and reduces the operation risk. Compared with the traditional detection method in which one phase is grounded and the other phases are suspended, the method of the present invention is safer and improves the safety.

Description

A fast phase determination device for high voltage lines of an electric power system and a method for using the same

Technical Field

The invention relates to a high-voltage line phase determination and phase checking device, and in particular to a high-voltage line rapid phase determination device for a power system and a use method thereof.

Background technique

In the power system, the power transmission and transformation projects and interval expansion, the new installation or wiring change of the power transmission and distribution projects, the connection work of the high-voltage lines with changed directions, and the overhaul of the main equipment, the power phase sequence verification test must be carried out at the completion and commissioning site. Phase verification refers to measuring the phase sequence and phase of two transmission lines, and then merging the two lines with the same phase sequence and phase. For example, the power grid merger, the main wiring form of the substation, the wiring group of the transformer, the secondary wiring method of the voltage transformer, etc., all need to be connected after phase verification.

When two power supply systems with different phase sequences or transformers with different connection groups are connected to work, a short circuit accident will occur, seriously damaging the two main transformers; the wrong phase sequence will cause the user's three-phase rotating electrical appliances to rotate in the opposite direction, damaging the equipment and scrapping the products; power instruments and measurements will fail; if AC power sources with different phases or phase sequences are connected in parallel or in a loop, a large current will be generated, which will cause damage to the generator or electrical equipment, affecting normal production or other adverse consequences.

At present, the power system mainly determines the phase of high-voltage overhead transmission lines by measuring the insulation resistance of each phase through an insulation resistance meter. Specifically, one end of one phase is grounded, and one end of the other phase is suspended. Then the operator connects the insulation resistance meter to the other end of one phase for testing. After the test is completed, the insulation resistance meter is disconnected from the measured phase, and the insulation resistance meter is connected to the other end of the next phase for testing. Both ends of the high-voltage line need to arrange personnel to change the wiring, which is cumbersome. In addition, since there are often other non-stop power lines or non-stop high-voltage lines erected on the same tower near the high-voltage line, when the measured phase is a suspended phase, an induced current with a voltage of up to tens of thousands of volts will be generated, which poses a great threat to the personal safety of the operator when wiring. The existing insulation resistance meter is provided with a protection circuit. When the induced current with a voltage of more than 70V is detected, the test function is turned off and the excitation voltage cannot be generated to prevent the operator from being shocked by the induced current when the insulation resistance meter is connected to the measured phase. However, this also makes it impossible for the insulation resistance meter to detect the insulation resistance of the measured phase when there is induced current, thereby affecting the phase determination.

Summary of the invention

The technical problem to be solved by the present invention is: in response to the technical problems existing in the prior art, the present invention provides a high-voltage line rapid phasing device for an electric power system, which can switch the high-voltage line under test, overcome the influence of induced electricity, is easy to operate, has a simple structure, and a method of using the device.

In order to solve the above technical problems, the technical solution proposed by the present invention is:

A fast phasing device for a high-voltage line of an electric power system comprises a shell and an excitation component and a feedback component arranged in the shell, wherein the excitation component comprises a DC high-voltage module and an output channel switching module, wherein the input end of the output channel switching module is connected to the DC high-voltage module, and the output end of the output channel switching module is connected to one end of each phase of the high-voltage line; the feedback component comprises a current measurement module, a processor and a data output module, wherein the input end of the current measurement module is connected to an earth return line, the output end of the current measurement module is connected to the input end of the processor, and the output end of the processor is connected to the data output module.

Preferably, the output end of the output channel switching module is provided with at least three voltage output channels, the voltage output channels correspond to each phase of the high voltage circuit one by one, and the voltage output channels are respectively connected to the corresponding phases.

Preferably, the DC high voltage module includes a battery unit and a DC high voltage conversion unit, the discharge end of the battery unit is connected to the input end of the DC high voltage conversion unit, and the output end of the DC high voltage conversion unit is connected to the input end of the output channel switching module.

Preferably, the data output module is a display module.

Preferably, the data output module includes an A/D analog-to-digital conversion unit and an LED display unit, the output end of the processor is connected to the input end of the A/D analog-to-digital conversion unit, and the output end of the A/D analog-to-digital conversion unit is connected to the input end of the LED display unit.

Preferably, the housing is provided with at least 4 ports, the current measurement module is connected to the earth return line through one of the ports, the output channel switching module is connected to one end of each phase of the high-voltage line through another port, the port is connected to an insulated wire, one end of the insulated wire is provided with a wire clamp, and the other end of the insulated wire is provided with a plug for connecting to the port.

Preferably, the insulated wire is a spring wire.

Preferably, the wire clamp is a metal clamp, and the hand-held end of the wire clamp is provided with an insulating sleeve.

The present invention also provides a method for using the above-mentioned power system high-voltage line rapid phase determination device, comprising the following steps:

1) Start the DC high-voltage module, connect one end of each phase of the high-voltage line to the output channel switching module, and connect the current measurement module to the ground;

2) Select the other end of one phase of the high-voltage line and suspend it in the air, and ground the other ends of the remaining phases. Switch the measured phases in turn through the output channel switching module, obtain the insulation resistance value of each corresponding phase through the feedback component, and determine the phase to be measured according to the insulation resistance value. The phase with infinite insulation resistance value is the suspended phase;

3) Repeat step 2 until all phases of the high-voltage line are in phase.

Compared with the prior art, the advantages of the present invention are:

1. The device of the present invention generates a stable DC high voltage output to the measured phase through a DC high voltage module, thereby overcoming the problem that the existing insulation resistance meter cannot generate an excitation voltage to measure the insulation resistance when there is induced electricity on the measured phase.

2. The device of the present invention switches the measured phase through the output channel switching module, thereby preventing the operator from receiving an induced electric shock when connecting the insulation resistance meter to the measured phase. At the same time, compared with the existing insulation resistance meter that changes the measured phase for wiring, the work efficiency is improved.

3. The method of the present invention adopts a detection method in which one phase is suspended and the other phases are grounded, so that when there are other non-stop power lines nearby or high-voltage lines are erected on the same tower without power outages, the induced voltage generated by the suspended phase is smaller, which improves safety compared to the traditional detection method in which one phase is grounded and the other phases are suspended.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of the internal structure of the present invention.

FIG. 2 is a schematic diagram of the external structure of the first embodiment of the present invention.

FIG. 3 is a schematic diagram of the structure of the insulated conductor of the present invention.

FIG. 4 is a diagram showing the working principle of the first embodiment of the present invention.

FIG. 5 is a schematic diagram of the external structure of the second embodiment of the present invention.

FIG. 6 is a schematic diagram of the external structure of the third embodiment of the present invention.

FIG. 7 is a diagram showing the working principle of the third embodiment of the present invention.

Legend: 1-housing; 11-port; 2-DC high voltage module; 21-battery unit; 22-DC high voltage conversion unit; 221-high voltage test button; 3-output channel switching module; 31-channel switching button; 4-current measurement module; 5-processor; 6-data output module; 61-A/D analog-to-digital conversion unit; 62-LED display unit; 7-insulated wire; 71-wire clamp; 72-plug.

Detailed ways

The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

Embodiment 1

As shown in FIG1 , the fast phase determination device of the high-voltage line of the power system of the present embodiment comprises a housing 1 and an excitation component and a feedback component arranged in the housing 1. The excitation component of the present embodiment comprises a DC high-voltage module 2 and an output channel switching module 3. The input end of the output channel switching module 3 is connected to the DC high-voltage module 2, and the output end of the output channel switching module 3 is connected to one end of each phase of the high-voltage line. The feedback component of the present embodiment comprises a current measurement module 4, a processor 5 and a data output module 6. The input end of the current measurement module 4 is connected to the earth return line, the output end of the current measurement module 4 is connected to the input end of the processor 5, and the output end of the processor 5 is connected to the data output module 6. The present embodiment generates a stable DC high voltage output to the measured phase through the DC high-voltage module 2, which overcomes the problem that the existing insulation resistance meter cannot generate an excitation voltage to measure the insulation resistance when there is induced electricity on the measured phase. The present embodiment switches the measured phase through the output channel switching module 3, which avoids the operator from being shocked by the induced electricity when connecting the insulation resistance meter to the measured phase, and at the same time improves the work efficiency compared with the existing insulation resistance meter changing the measured phase for wiring.

The processor 5 of this embodiment can directly output the current value detected by the current measurement module 4 to the data output module 6. The operator calculates the insulation resistance of the measured phase through the voltage value of the measured phase and the current value obtained from the data output module 6, so as to determine the phase according to the insulation resistance value. The operator can also preset the voltage value of the measured phase in the processor 5, and the processor 5 processes the preset voltage value and the current value detected by the current measurement module 4 to obtain the insulation resistance value of the measured phase, and then the processor 5 outputs the insulation resistance value to the data output module 6 for the operator to determine the phase, thereby avoiding errors in manual calculation and improving work efficiency. In this embodiment, the processor 5 adopts a CPLD (complex programmable logic device) chip, and the CPLD chip is preset with the voltage value of the measured phase. The CPLD chip performs logical operation processing on the data of the voltage value and the current value to obtain the insulation resistance value of the measured phase, and then outputs the insulation resistance value to the data output module 6.

The shell 1 in this embodiment is made of plastic, which can better protect the components inside the device, prevent the device from accidentally falling during use and causing damage to the internal components, avoid harm to the operator caused by leakage of the device, and avoid the problem of corrosion when the shell 1 is made of metal.

As shown in FIG. 1 , the output end of the output channel switching module 3 of this embodiment is provided with three voltage output channels. The voltage output channels correspond to each phase of the high voltage circuit one by one, and the voltage output channels are connected to the corresponding phases respectively.

As shown in FIG. 2 , the output channel switching module 3 of this embodiment includes a channel switching button 31 , which is disposed on the housing 1 . When operating, pressing the channel switching buttons 31 in sequence can switch the voltage output channel of the output channel switching module 3 .

As shown in FIG1 , in this embodiment, the DC high voltage module 2 includes a battery unit 21 and a DC high voltage conversion unit 22, the discharge end of the battery unit 21 is connected to the input end of the DC high voltage conversion unit 22, and the output end of the DC high voltage conversion unit 22 is connected to the input end of the output channel switching module 3. The battery unit 21 in this embodiment uses a rechargeable lithium battery, and the voltage of the battery unit 21 is 12V. The DC high voltage conversion unit 22 in this embodiment is a DC/DC DC high voltage conversion unit, which includes a PWM pulse width modulation circuit and an inverter. The PWM pulse width modulation circuit controls the voltage output by changing the duty cycle of the inverter pulse voltage, and has the advantages of high conversion efficiency and low power consumption. The PWM pulse width modulation circuit uses the SG3525 chip as the PWM control chip, and the output voltage of the DC high voltage conversion unit 22 is 2500V.

As shown in FIG2 , the DC high voltage conversion unit 22 of this embodiment is provided with a high voltage test button 221 for starting the unit circuit, and the high voltage test button 221 is arranged on the housing 1. The housing 1 of this embodiment is also provided with a main power switch, and after the main power switch is turned on to start the instrument, pressing the high voltage test button 221 can start the DC high voltage conversion unit 22 to output DC high voltage.

As shown in FIG1 , in this embodiment, the data output module 6 is a display module, which enables the operator to quickly and conveniently check the line phase sequence according to the displayed content. The data output module 6 includes an A/D analog-to-digital conversion unit 61 and an LED display unit 62. The LED display unit 62 is arranged on the housing 1. The output end of the processor 5 is connected to the input end of the A/D analog-to-digital conversion unit 61, and the output end of the A/D analog-to-digital conversion unit 61 is connected to the input end of the LED display unit 62. The A/D analog-to-digital conversion unit 61 of this embodiment adopts an AD7710 analog-to-digital converter, which, as a complete analog front end for low-frequency measurement applications, can directly accept low-level signals and generate serial digital outputs.

As shown in FIG. 1 and FIG. 2 , in this embodiment, four ports 11 are provided on the housing 1, and the ports 11 correspond to the voltage output channels of the output channel switching module 3 and the input terminals of the current measurement module 4 one by one. The output channel switching module 3 is connected to one end of each phase of the high-voltage line through three of the ports 11, and the current measurement module 4 is connected to the earth return line through another port 11. To facilitate identification by operators, in this embodiment, the three ports 11 connected to the output channel switching module 3 are marked as channel 1, channel 2, and channel 3, respectively, and the port 11 connected to the current measurement module 4 is marked as the E terminal (ground terminal).

As shown in Figures 1 and 3, in order to facilitate the connection between the device of this embodiment and the high-voltage line and the earth return line, the port 11 of this embodiment is connected to an insulated wire 7, one end of the insulated wire 7 is provided with a wire clamp 71, and the other end of the insulated wire 7 is provided with a plug 72 for connecting to the port 11.

As shown in FIG. 3 , the insulated conductor 7 of the present embodiment is a spring wire, which not only saves storage space but also can realize length adjustment through free extension and retraction, so as to facilitate the detection of high-voltage lines at high places.

As shown in FIG. 3 , the wire clamp 71 of this embodiment is a metal clamp, and an insulating sleeve is provided at the hand-held end of the wire clamp 71 to reduce the risk of electric shock to operators during the wiring process.

As shown in FIG4 , the method for using the high-voltage line rapid phase determination device of the power system of this embodiment includes the following steps:

1) To ensure safety, the power equipment maintenance personnel and the operator ground both ends of the A, B, and C phases of the high-voltage line, and then the operator connects the channels 1, 2, and 3 of the device to one end of the A, B, and C phases through the insulated wire 7, and at the same time connects the E end of the present invention to the earth through the insulated wire 7, and then disconnects the end of the A, B, and C phases connected to the device from the earth, and finally the operator turns on the main power switch of the device and presses the high-voltage test button 221 to start the DC high-voltage conversion unit 22;

2) After the power equipment operation and maintenance personnel select the other end of one phase of the tested high-voltage line A phase, B phase, and C phase to be suspended and the other ends of the other phases to be grounded, the operator presses the channel switching button 31 every 5 seconds to switch the tested phase and obtains the insulation resistance value of each corresponding phase according to the display content of the LED display unit 62. The detection method of one phase suspended and the other phases grounded is adopted. In the case where there are other non-stop power lines nearby or non-stop high-voltage lines erected on the same tower, the induced voltage generated by the suspended phase is smaller, which improves safety compared to the traditional detection method of one phase grounded and the other phases suspended. Then the operator determines the phase to be tested according to the insulation resistance value, and the phase with infinite insulation resistance is the suspended phase;

specific:

If phases A and B are grounded and phase C is left floating, the phase insulation resistances corresponding to channels 1 and 2 are zero, and the phase insulation resistance corresponding to channel 3 is infinite, then the phase corresponding to channel 3 is determined to be phase C;

If phases B and C are connected to the ground, and phase A is left floating, the phase insulation resistances corresponding to channels 2 and 3 are zero, and the phase insulation resistance corresponding to channel 1 is infinite, then the phase corresponding to channel 1 is determined to be phase A;

If phases A and C are grounded, and phase B is left floating, the phase insulation resistances corresponding to channels 1 and 3 are zero, and the phase insulation resistance corresponding to channel 2 is infinite, then the phase corresponding to channel 2 is determined to be phase B;

3) Repeat step 2 until all phases of the high-voltage line under test are phased.

Embodiment 2

As shown in FIG5 , the high-voltage line rapid phasing device of the electric power system of the present embodiment is basically the same as that of the first embodiment, except that the output channel switching module 3 of the present embodiment includes a timing switching unit (not shown in the figure), so that the output channel switching module 3 of the present embodiment can switch the measured phase at a timing, thereby eliminating the channel switching button 31, reducing the operation of manually switching the measured phase during the phasing process, and further simplifying the operation steps. In the present embodiment, the switching interval of the timing switching unit is 8 seconds.

Embodiment 3

The electric power system high-voltage line rapid phasing device of this embodiment is basically the same as that of the first embodiment, except that the output end of the output channel switching module 3 of this embodiment is provided with four voltage output channels, three of which correspond one to one to the transmission lines of the high-voltage line, and the other corresponds to the neutral line of the high-voltage line, so that this embodiment adds a phasing detection function for the neutral line.

As shown in FIG6 , the housing 1 of this embodiment is provided with five ports 11, and the ports 11 correspond to the voltage output channels of the output channel switching module 3 and the input terminals of the current measuring module 4 one by one. The output channel switching module 3 is connected to one end of each phase of the high voltage line through four of the ports 11, and the current measuring module 4 is connected to the earth return line through another port 11. To facilitate identification by the operator, in this embodiment, the four ports 11 connected to the output channel switching module 3 are marked as channel 1, channel 2, channel 3 and channel 4, respectively, and the port 11 connected to the current measuring module 4 is marked as the E terminal (ground terminal).

As shown in FIG7 , the method for using the high-voltage line rapid phase determination device of the power system of this embodiment includes the following steps:

1) To ensure safety, the power equipment maintenance personnel and the operator ground the A phase, B phase, C phase and both ends of the neutral line of the high-voltage line, and then the operator connects the channel 1, channel 2, channel 3 and channel 4 of the present invention to the A phase, B phase, C phase and one end of the neutral line of the high-voltage line to be tested through the insulated wire 7, and at the same time connects the E end of the present invention to the earth through the insulated wire 7, and then disconnects the end of the A phase, B phase, C phase and the neutral line connected to the device from the earth, and finally the operator turns on the main power switch of the device and presses the high-voltage test button 221 to start the DC high-voltage conversion unit 22;

2) After the power equipment operation and maintenance personnel select phase A, phase B, phase C and the other end of one phase of the neutral line to be suspended and the other ends of the other phases to be grounded, the operator presses the channel switching button 31 every 5 seconds to switch the measured phase and obtains the insulation resistance value of each corresponding phase according to the display content of the LED display unit 62. Then the operator determines the phase to be measured according to the insulation resistance value, and the phase with infinite insulation resistance is the suspended phase:

specific:

If phases A, B, and C are connected to the ground, and the neutral line is suspended, the phase insulation resistances corresponding to channels 1, 2, and 3 are zero, and the phase insulation resistance corresponding to channel 4 is infinite, then the phase corresponding to channel 4 is determined to be the neutral line;

If phase B, phase C, and the neutral line are connected to the ground, and phase A is left floating, the phase insulation resistances corresponding to channels 2, 3, and 4 are zero, and the phase insulation resistance corresponding to channel 1 is infinite, then the phase corresponding to channel 1 is determined to be phase A;

If phase A, phase C, and the neutral line are connected to the ground, and phase B is left floating, the phase insulation resistances corresponding to channel 1, channel 3, and channel 4 are zero, and the phase insulation resistance corresponding to channel 2 is infinite, then the phase corresponding to channel 2 is determined to be phase B;

If phase A, phase B, and the neutral line are connected to the ground, and phase C is left floating, the phase insulation resistances corresponding to channels 1, 2, and 4 are zero, and the phase insulation resistance corresponding to channel 3 is infinite, then the phase corresponding to channel 3 is determined to be phase C;

3) Repeat step 2 until all phases of the high-voltage line under test are in phase.

The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims (8)

1. The utility model provides a quick phasing device of electric power system high voltage line, its characterized in that includes shell (1) and sets up excitation subassembly and feedback subassembly in shell (1), excitation subassembly includes direct current high voltage module (2) and output channel switching module (3), the input and the direct current high voltage module (2) of output channel switching module (3) are connected, the output of output channel switching module (3) is connected with the one end of each looks of high voltage line, feedback subassembly includes current measurement module (4), treater (5) and data output module (6), the input and the earth return wire connection of current measurement module (4), the output of current measurement module (4) is connected with the input of treater (5), the output of treater (5) is connected with data output module (6), the quick phasing device's of electric power system high voltage line's application method includes following steps:

1) One end of each phase of the high-voltage line is respectively connected with an output channel switching module (3), a current measuring module (4) is connected with the ground, and a direct-current high-voltage module (2) is started;

2) The other end of one phase of the high-voltage line is selected to be suspended, the other ends of the other phases are grounded, the phases to be tested are sequentially switched through an output channel switching module (3), each corresponding insulation resistance value is respectively obtained through a feedback component, the phases to be tested are phased according to the insulation resistance values, and the phases with infinite insulation resistance values are suspended phases;

3) Step 2 is repeated until the phases of the high-voltage line are phased.

2. The rapid phasing device of high-voltage lines of a power system according to claim 1, wherein the output end of the output channel switching module (3) is provided with at least 3 voltage output channels, the voltage output channels are in one-to-one correspondence with the phases of the high-voltage lines, and the voltage output channels are respectively connected with the corresponding phases.

3. The rapid phasing device of high-voltage lines of an electric power system according to claim 1, characterized in that the direct-current high-voltage module (2) comprises a battery unit (21) and a direct-current high-voltage conversion unit (22), wherein a discharge end of the battery unit (21) is connected with an input end of the direct-current high-voltage conversion unit (22), and an output end of the direct-current high-voltage conversion unit (22) is connected with an input end of the output channel switching module (3).

4. Rapid phasing device for high-voltage lines of an electrical power system according to claim 1, characterized in that the data output module (6) is a display module.

5. The rapid phasing device of high-voltage lines of an electric power system according to claim 4, characterized in that the data output module (6) comprises an a/D analog-to-digital conversion unit (61) and an LED display unit (62), the output end of the processor (5) is connected with the input end of the a/D analog-to-digital conversion unit (61), and the output end of the a/D analog-to-digital conversion unit (61) is connected with the input end of the LED display unit (62).

6. The rapid phasing device of high-voltage lines of an electric power system according to claim 1, characterized in that at least 4 ports (11) are provided on the housing (1), the current measuring module (4) is connected with a ground return line through 1 of the ports (11), the output channel switching module (3) is connected with one end of each phase of the high-voltage line through the other port (11), the port (11) is connected with an insulated conductor (7), one end of the insulated conductor (7) is provided with a wire clamp (71), and the other end of the insulated conductor (7) is provided with a plug (72) for connecting with the port (11).

7. The rapid phasing device of high voltage lines of an electrical power system according to claim 6, characterized in that the insulated wire (7) is a spring wire.

8. The rapid phasing device of high voltage lines of an electrical power system according to claim 6, characterized in that said wire clamp (71) is a metal clamp, the hand-held end of said wire clamp (71) being provided with an insulating sleeve.