CN112198376A - Phase checking instrument and phase checking method before distribution network lapping - Google Patents
Phase checking instrument and phase checking method before distribution network lapping Download PDFInfo
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Abstract
The invention discloses a nuclear phase instrument before distribution network overlapping, which comprises a microcontroller, a wire clamp, a color-changeable indicator lamp module, a master-slave selector switch, a voltage acquisition device, a current acquisition device, a direct-current power supply, a short-circuit relay, a positive power supply switching relay, a negative power supply switching relay and an A/D conversion comparison module. When the two phases of the master side are short-circuited and the same two phases corresponding to the slave side are applied with voltage, the two phases can detect the current in the loops, and the undetected phase is the same-phase line of the phase which is not short-circuited with the master side. The invention can check the correctness of the phase sequence without power transmission at two ends of the line, thereby avoiding faults and power failure again caused by construction errors.
Description
Technical Field
The invention relates to a phase checking instrument and a phase checking method before distribution network lapping, and belongs to the technical field of power detection equipment.
Background
The construction of the distribution network line is completed by lapping, if the phase sequence is incorrect, the large impact can be brought to the power grid, the fault tripping is caused, and the power supply reliability is reduced. Therefore, the phase of the construction line needs to be checked before the lap joint, and the prior art has no reliable means for checking the phase sequence of the line from the completion of the line construction to the lap joint, can only judge whether the phase is connected in error by manual experience, and then verify the result of the empirical judgment before the lap joint. Because one end of the two ends of the line which needs to be constructed in the phase checking process is powered on, and part of users can already use the power after the power is supplied, if the wiring error needs to be adjusted in a power failure mode, the power failure can be caused again, the power failure duration is prolonged, the power consumption of the users is inconvenient, and the satisfaction degree is reduced.
Disclosure of Invention
The invention aims to provide a phase checking instrument and a phase checking method before distribution network lapping, which can check the correctness of a phase sequence without power transmission at two ends of a line, thereby avoiding faults and secondary power failure caused by construction errors.
The purpose of the invention is realized by the following technical scheme:
a nuclear phase instrument before distribution network lapping comprises a microcontroller, a wire clamp A, a wire clamp B, a wire clamp C, a color-changeable indicator light module LA, a color-changeable indicator light module LB, a color-changeable indicator light module LC, a master-slave change-over switch K, a voltage acquisition device V1, a voltage acquisition device V2, a voltage acquisition device V3, a current acquisition device A1, a current acquisition device A2, a current acquisition device A3, a slide rheostat R1 and a slide rheostat R2, the device comprises a slide rheostat R3, a direct-current power supply, a relay RA, a relay RB, a relay RC, a positive power supply switching relay VA1, a positive power supply switching relay VB1, a positive power supply switching relay VC1, a negative power supply switching relay VA2, a negative power supply switching relay VB2, a negative power supply switching relay VC2, a first A/D conversion comparison module, a second A/D conversion comparison module and a third A/D conversion comparison module;
two ends of the voltage acquisition device V1 are connected between the wire clamp A and the wire clamp B, two ends of the voltage acquisition device V2 are connected between the wire clamp B and the wire clamp C, two ends of the voltage acquisition device V3 are connected between the wire clamp A and the wire clamp C, one end of the current acquisition device A1 is connected with the wire clamp A, the other end of the current acquisition device A1 is connected with the fixed end of the sliding rheostat R1, one end of the current acquisition device A2 is connected with the wire clamp B, the other end of the current acquisition device A2 is connected with the fixed end of the sliding rheostat R2, one end of the current acquisition device A3 is connected with the wire clamp C, the other end of the current acquisition device A3 is connected with the fixed end of the sliding rheostat R3, one end of the relay RA is connected with the sliding end of the sliding rheostat R3, the other end of the relay RA is connected with one end of the relay RB, one end of a relay RC is connected between a relay RA and a relay RB, the other end of the relay RC is connected with the sliding end of a sliding rheostat R1, one ends of normally open contacts of a positive power supply switching relay VA1, a positive power supply switching relay VB1 and a positive power supply switching relay VC1 are respectively connected with the sliding ends of the sliding rheostat R1, the sliding rheostat R2 and the sliding rheostat R3, and the other ends of the normally open contacts of the positive power supply switching relay VA1, the positive power supply switching relay VB1 and the positive power supply switching relay VC1 are connected with the positive electrode of a direct-current power supply;
one ends of normally open contacts of the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are respectively connected with sliding ends of the sliding rheostat R1, the sliding rheostat R2 and the sliding rheostat R3, and the other ends of the normally open contacts of the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are connected with the negative electrode of the direct-current power supply;
voltage signals collected by a voltage collecting device V1 and current signals collected by a current collecting device A1 are respectively input into a first A/D conversion comparison module, voltage signals collected by a voltage collecting device V2 and current signals collected by a current collecting device A2 are respectively input into a second A/D conversion comparison module, voltage signals collected by a voltage collecting device V3 and current signals collected by a current collecting device A are respectively input into a third A/D conversion comparison module, and comparison result output ends of the first A/D conversion comparison module, the second A/D conversion comparison module and the third A/D conversion comparison module are connected with a data input end of a microcontroller;
the microcontroller respectively outputs control signals to the control input ends of the variable color indicator lamp module LA, the variable color indicator lamp module LB and the variable color indicator lamp module LC to control the lighting and the light-emitting colors of the variable color indicator lamp module LA, the variable color indicator lamp module LB and the variable color indicator lamp module LC;
the master-slave switch K is connected with a microcontroller, the relay RA, the relay RB, the relay RC, the positive power supply switching relay VA1, the positive power supply switching relay VB1, the positive power supply switching relay VC1, the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are respectively provided with a MOSFET tube, one end of the relay RA coil, the relay RB coil, the relay RC coil, the positive power supply switching relay VA1 coil, the positive power supply switching relay VB1 coil, the positive power supply switching relay VC1 coil, the negative power supply switching relay VA2 coil, the negative power supply switching relay VB2 coil and the negative power supply switching relay VC2 coil is connected with a power supply VCC, and one end of the relay RA coil, the relay RB coil, the relay RC coil, the positive power supply switching relay VA1 coil, the positive power supply switching relay VB1 coil, the positive power supply switching relay VC1 coil, the relay RA, The other ends of the coil of the negative power supply switching relay VA2, the coil of the negative power supply switching relay VB2 and the coil of the negative power supply switching relay VC2 are respectively connected with the D electrodes of the MOSFET tubes which are respectively configured, the S electrodes of the MOSFET tubes are grounded, and the G electrodes of the MOSFET tubes are respectively connected with the microcontroller.
A nuclear phase method of a nuclear phase instrument before distribution network lapping comprises the following steps:
the wire clamp A, the wire clamp B and the wire clamp C of the host are respectively connected with A, B, C three phases of the fixed phase sequence end, and after the host and the slave are started, the host color-changeable indicator lamp LA module, the color-changeable indicator lamp LB module and the color-changeable indicator lamp LC module are respectively lightened into three colors of yellow, green and red; the host side is in short circuit B, C two phases, the slave computer starts a discrimination program, after the discrimination program is finished, the slave computer lights the color-changeable indicator lamp module of one phase without current into a yellow lamp, then the slave computer applies pulse voltage between the phase with current and the phase without current for n seconds, and the slave computer enters the next discrimination program after n seconds;
after receiving the pulse voltage signal, the host machine disconnects B, C two-phase short circuit connection, changes the short circuit connection into A, C two-phase short circuit connection, starts a judging program, after the judging program is finished, the slave machine lights the variable color indicator lamp module of one phase without current into a green lamp, then the pulse voltage signal is added between the phase with current and the phase without current for n seconds from the machine side, and the slave machine enters the next judging program after n seconds;
after the host receives the pulse voltage signal, the host disconnects A, C two-phase short circuit connection, changes the short circuit connection into A, B two-phase short circuit connection, starts a judging program, after the judging program of the slave is finished, the slave lights the color-changeable indicator lamp module without current for one phase into a red light, then the slave adds the pulse voltage between the current phase and the current-free phase for n seconds, after n seconds, the slave finishes the program, and after the host receives the pulse voltage signal, the host finishes the program;
the slave machine judging method comprises the following steps: under the state that the host machine is in short circuit with a certain two phases, the slave machine sequentially applies voltages between the AB two phases, the BC two phases and the AC two phases, detects A, B, C whether each phase has current, and checks for 3 times in sequence, wherein the phase without current is the phase that the host machine is not in short circuit, the slave machine lights a color-changeable indicator lamp module corresponding to the connected wire clamp, and displays corresponding colors, wherein A corresponds to yellow, B corresponds to green, and C corresponds to red.
The object of the invention can be further achieved by the following technical measures:
the nuclear phase instrument before distribution network overlap joint, the internal structure of the color-changeable indicator light module LA, the color-changeable indicator light module LB and the color-changeable indicator light module LC are as follows: the LED comprises a red-green bicolor LED, two current-limiting resistors and two MOSFET tubes, wherein the model of the red-green bicolor LED is LTST-C195KGJRKT, the anode of the red-green bicolor LED is connected with the anode of a power supply, the two cathodes of the red-green bicolor LED are respectively connected with the D poles of the respective MOSFET tubes after being respectively connected with the current-limiting resistors in series, the S poles of the two MOSFET tubes are both grounded, and the G poles of the two MOSFET tubes are respectively connected with a control port of a microcontroller.
The first A/D conversion comparison module, the second A/D conversion comparison module and the third A/D conversion comparison module have the following internal structures: the device comprises an A/D converter and a comparator, wherein the output end of the A/D converter is connected with the input end of the comparator, a comparison reference signal is input into the comparison input end of the comparator, and the output end of the comparator outputs a comparison result to the microcontroller.
Compared with the prior art, the invention has the beneficial effects that: the correctness of the phase sequence can be checked without power transmission at two ends of the line, so that the phase sequence fault and the secondary power failure caused by construction errors are avoided. The nuclear phase method is simple and convenient, clear in indication and high in accuracy.
Drawings
FIG. 1 is a schematic diagram of the nuclear phase instrument circuit of the present invention;
FIG. 2 is a schematic diagram of the control circuit of the nuclear phase instrument of the present invention;
FIG. 3 is a host and slave wiring diagram;
FIG. 4 is a flow chart of a host program;
fig. 5 is a slave program flow chart.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The basic basis of the design of the invention is as follows:
at both ends of the spliced line (on the switchgear cabinet or overhead line), the spliced object must have a clear ABC three-phase indication:
in the cubical switchboard: the insulation skin of the lapped pile head is marked by yellow green red or other marks, and the phase sequence arrangement condition of other adjacent outlet intervals can be seen through the observation window of the rear door of the adjacent running interval switch cabinet even if no mark exists, so that the phase sequence of the side of the switch cabinet can be determined. Overhead line: the current flows from the substation in A, B, C three phases in sequence from left to right, so the phase sequence of the operating line can be determined.
As shown in fig. 1 and 2, the distribution network pre-lap phase checking instrument comprises a microcontroller, a wire clamp a, a wire clamp B, a wire clamp C, a color-changeable indicator light module LA, a color-changeable indicator light module LB, a color-changeable indicator light module LC, a master-slave switch K, a voltage acquisition device V1, a voltage acquisition device V2, a voltage acquisition device V3, a current acquisition device a1, a current acquisition device a2, a current acquisition device A3 and a slide rheostat R1, the device comprises a sliding rheostat R2, a sliding rheostat R3, a direct-current power supply, a relay RA, a relay RB, a relay RC, a positive power supply switching relay VA1, a positive power supply switching relay VB1, a positive power supply switching relay VC1, a negative power supply switching relay VA2, a negative power supply switching relay VB2, a negative power supply switching relay VC2, a first A/D conversion comparison module, a second A/D conversion comparison module and a third A/D conversion comparison module.
Two ends of the voltage acquisition device V1 are connected between the wire clamp A and the wire clamp B, two ends of the voltage acquisition device V2 are connected between the wire clamp B and the wire clamp C, two ends of the voltage acquisition device V3 are connected between the wire clamp A and the wire clamp C, one end of the current acquisition device A1 is connected with the wire clamp A, the other end of the current acquisition device A1 is connected with the fixed end of the sliding rheostat R1, one end of the current acquisition device A2 is connected with the wire clamp B, the other end of the current acquisition device A2 is connected with the fixed end of the sliding rheostat R2, one end of the current acquisition device A3 is connected with the wire clamp C, the other end of the current acquisition device A3 is connected with the fixed end of the sliding rheostat R3, one end of the relay RA is connected with the sliding end of the sliding rheostat R3, the other end of the relay RA is connected with one end of the relay RB, one end of a relay RC is connected between the relay RA and the relay RB, the other end of the relay RC is connected with the sliding end of the sliding rheostat R1, one ends of normally open contacts of the positive power supply switching relay VA1, the positive power supply switching relay VB1 and the positive power supply switching relay VC1 are respectively connected with the sliding ends of the sliding rheostat R1, the sliding rheostat R2 and the sliding rheostat R3, and the other ends of the normally open contacts of the positive power supply switching relay VA1, the positive power supply switching relay VB1 and the positive power supply switching relay VC1 are connected with the positive electrode of the direct-current power supply. The slide rheostat R1, the slide rheostat R2 and the slide rheostat R3 play a role in current limiting. The voltage acquisition device and the current acquisition device can be realized by common voltage transformers, current transformers and the like.
One ends of normally open contacts of the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are respectively connected with sliding ends of the sliding rheostat R1, the sliding rheostat R2 and the sliding rheostat R3, and the other ends of the normally open contacts of the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are connected with the negative electrode of the direct-current power supply.
The voltage signal collected by the voltage collecting device V1 and the current signal collected by the current collecting device A1 are respectively input into the first A/D conversion comparison module, the voltage signal collected by the voltage collecting device V2 and the current signal collected by the current collecting device A2 are respectively input into the second A/D conversion comparison module, the voltage signal collected by the voltage collecting device V3 and the current signal collected by the current collecting device A are respectively input into the third A/D conversion comparison module, and the comparison result output ends of the first A/D conversion comparison module, the second A/D conversion comparison module and the third A/D conversion comparison module are connected with the data input end of the microcontroller. The internal structures of the first A/D conversion comparison module, the second A/D conversion comparison module and the third A/D conversion comparison module are as follows: the device comprises an A/D converter and a comparator, wherein the output end of the A/D converter is connected with the input end of the comparator, a comparison reference signal is input into the comparison input end of the comparator, and the output end of the comparator outputs a comparison result to the microcontroller. The A/D converter converts analog voltage and current signal quantities into digital quantities, and the analog voltage and current signal quantities are matched with a 74LS460 comparison chip to compare the acquired digital quantities with the allowable error value, and the digital quantities are compared with the allowable error value (such as 0.01V and 0.01A), if the digital quantities are larger than the allowable error value, a result 1 is output, and if the digital quantities are not larger than the allowable error value, a result 0 is output. The A/D conversion and comparison module is used for judging whether voltage and current signals exist.
The microcontroller respectively outputs control signals to the control input ends of the variable color indicator lamp module LA, the variable color indicator lamp module LB and the variable color indicator lamp module LC to control the lighting and the light-emitting colors of the variable color indicator lamp module LA, the variable color indicator lamp module LB and the variable color indicator lamp module LC. The internal structures of the color-changeable indicator light module LA, the color-changeable indicator light module LB and the color-changeable indicator light module LC are as follows: the LED comprises a red-green bicolor LED, two current-limiting resistors and two MOSFET tubes, wherein the model of the red-green bicolor LED is LTST-C195KGJRKT, and the bicolor LED can realize red, green, red + green yellow and three-color illumination. The anode of the red and green bicolor light emitting diode is connected with the anode of the power supply, the two cathodes of the red and green bicolor light emitting diode are respectively connected with the D poles of the MOSFET tubes which are respectively arranged after being respectively connected with the current limiting resistors which are respectively arranged in series, the S poles of the two MOSFET tubes are both grounded, and the G poles of the two MOSFET tubes are respectively connected with the control port of the microcontroller. And the control end of the microcontroller outputs a signal to the G pole of the MOSFET tube which plays a role of controlling the corresponding red-green bicolor light-emitting diode according to the nuclear phase result, and lights the indicator light and displays corresponding colors.
And the master-slave change-over switch K is connected with the microcontroller and is used for setting the states of a master machine and a slave machine of the nuclear phase instrument before the distribution network is lapped. The relay RA, the relay RB, the relay RC, the positive power supply switching relay VA1, the positive power supply switching relay VB1, the positive power supply switching relay VC1, the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are respectively provided with a MOSFET tube, one end of each of the relay RA coil, the relay RB coil, the relay RC coil, the positive power supply switching relay VA1 coil, the positive power supply switching relay VB1 coil, the positive power supply switching relay VC1 coil, the negative power supply switching relay VA2 coil, the negative power supply switching relay VB2 coil and the negative power supply switching relay VC2 coil is connected with a power supply VCC, and one end of each of the relay RA coil, the relay RB coil, the relay RC coil, the positive power supply switching relay VA1 coil, the positive power supply switching relay VB1 coil, the positive power supply switching relay VC1 coil and the negative power supply switching relay VA2, The other ends of the coil of the negative power supply switching relay VB2 and the coil of the negative power supply switching relay VC2 are respectively connected with the D poles of the MOSFET tubes which are respectively configured, the S poles of the MOSFET tubes are grounded, and the G poles of the MOSFET tubes are respectively connected with the microcontroller. When the relay RA, the relay RB and the relay RC are used for testing, two phases of short circuits are connected, if the relay coil of the RA and the relay coil of the RB are electrified when the relay coil of the AB is connected, and the normally-open node of the RA and the relay coil of the RB is closed, so that the relay coil of the RA and the relay coil of the RB can be realized. The DC power supply is used for pressurizing and outputting pulse voltage during testing. The positive power switching relay VA1, the positive power switching relay VB1, the positive power switching relay VC1, the negative power switching relay VA2, the negative power switching relay VB2, and the negative power switching relay VC2 can pressurize between two phases according to different action combinations, and can change the voltage direction. For example, when AB two-phase pressurization is carried out, the two relays VA1 and VB2 are electrified, and normally open nodes of the two relays VA1 and VB2 are closed. The voltage or the pulse signal is not applied at the same time, namely, the direct current voltage and the pulse voltage cannot exist at the same time, and when some two phases are pressurized, except the normally-open node required by pressurization, other normally-open nodes are closed, and all other normally-open nodes are opened.
The use method of the nuclear phase instrument before distribution network lapping comprises the following steps: as shown in fig. 3, two sets of distribution network pre-lap nuclear phase detectors are used in a matched manner, namely a host and a slave, wherein a wire clamp a, a wire clamp B and a wire clamp C of the host are respectively connected with A, B, C three phases of a fixed phase sequence end, the slave measures at the other end of a line, the wire clamp a, the wire clamp B and the wire clamp C of the slave are respectively connected with a line end of a measuring end with an unknown phase sequence, and the slave determines a program principle as follows: if two phases on the host side are in short circuit, if the same two phases corresponding to the slave side are applied with voltage, the current can be detected in the loops of the two phases, and the undetected phase is the same-phase line of the phase which is not in short circuit with the host side. And completing three phase-to-phase (AC phase, AB phase and BC phase) checks, then defining the phase without current in the three checks as a no-current phase, and lighting the corresponding bulb and the color of the phase as an output result. And the color-variable indicator light module LA, the color-variable indicator light module LB and the color-variable indicator light module LC of the slave display three colors of yellow, green and red according to the phase checking result, yellow represents an A phase, green represents a B phase and red represents a C phase, and the three phases are judged A, B, C according to the display colors, so that the phase checking is completed.
As shown in fig. 4, the working process is as follows: after the host machine and the slave machine are started, the host machine lights the three yellow, green and red bulbs, and the slave machine clears the number N. The host machine is in short circuit with the BC two phases, the slave machine starts a judging program, after the judging program is finished, the slave machine lights a yellow lamp without a flow phase, then the slave machine applies pulse voltage between the flow phase and the non-flow phase for 5 seconds, and the slave machine enters the next judging program after 5 seconds. After the host receives the pulse signal, the current short-circuit connection is disconnected, the short-circuit connection is changed into the short-circuit connection of the two phases of AC, after the judgment program of the slave is finished, the slave lights the green light without the current phase, then the pulse voltage is applied between the current phase and the current-free phase for 5 seconds from the slave side, and after 5 seconds, the slave enters the next judgment program. After the host receives the pulse signal, the current short-circuit connection is disconnected, the short-circuit connection is changed into a short-circuit connection of two phases AB, after the judgment program of the slave is finished, the slave lights the red light without the current phase, then the pulse voltage is applied between the current phase and the current-free phase for 5 seconds from the slave side, and after 5 seconds, the slave finishes the program. And after the host receives the pulse signal, ending the host program. When the current exists in two phases of pressurization in the three pressurization processes and only occurs in one pressurization process, the result can be determined, otherwise, the program is judged to be wrong, and the process is stopped.
In order to prevent the host from being started after the slave is started, and program errors caused by the fact that current cannot be detected are avoided, the counting number N is set on the side of the slave for control, the judging program is required to enable the slave to start counting after the current is detected, N +1 can be achieved only when the current is detected, the number N can be increased, only when the current is detected, the checking result is calculated to be a valid result, and otherwise, the invalid result is not adopted by the system. After three times of inter-phase (AC phase, AB phase and BC phase) investigation is completed, the phase without current in the three times of investigation is allowed to be defined as a no-current phase, and as an output result, the corresponding bulb and the color of the lamp are lightened.
The principle of the slave machine discrimination program is as follows: when two phases on the master side are short-circuited and the same two phases corresponding to the slave side are applied with voltage, the two phases can both detect the current in the loops, and the phase which cannot be detected is the same-phase line which is not short-circuited with the master side.
As shown in fig. 5, the slave determination method includes: under the state that the host machine is in short circuit with a certain two phases, the slave machine sequentially applies voltages between the AB two phases, the BC two phases and the AC two phases, detects A, B, C whether each phase has current, and checks for 3 times in sequence, wherein the phase without current is the phase that the host machine is not in short circuit, the slave machine lights a color-changeable indicator lamp module corresponding to the connected wire clamp, and displays corresponding colors, wherein A corresponds to yellow, B corresponds to green, and C corresponds to red.
In order to avoid the situation that N is not 1 due to the influence caused by detection errors, a counting S is set, S +1 can be achieved only after three times of alternate pressurization, the result is abnormal (N is not 1), when S is 3, 3 rounds of effective investigation are completed, the results are all abnormal, an alarm signal is reported, and the program is terminated.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
Claims (4)
1. A nuclear phase instrument before distribution network lapping is characterized in that, the device comprises a microcontroller, a wire clamp A, a wire clamp B, a wire clamp C, a color-changeable indicator lamp module LA, a color-changeable indicator lamp module LB, a color-changeable indicator lamp module LC, a master-slave change-over switch K, a voltage acquisition device V1, a voltage acquisition device V2, a voltage acquisition device V3, a current acquisition device A1, a current acquisition device A2, a current acquisition device A3, a sliding rheostat R1, a sliding rheostat R2, a sliding rheostat R3, a direct-current power supply, a relay RA, a relay RB, a relay RC, a positive power switching relay VA1, a positive power switching relay VB1, a positive power switching relay VC1, a negative power switching relay VA2, a negative power switching relay VB2, a negative power switching relay VC2, a first A/D conversion comparison module, a second A/D conversion comparison module and a third A/D conversion comparison module; two ends of the voltage acquisition device V1 are connected between the wire clamp A and the wire clamp B, two ends of the voltage acquisition device V2 are connected between the wire clamp B and the wire clamp C, two ends of the voltage acquisition device V3 are connected between the wire clamp A and the wire clamp C, one end of the current acquisition device A1 is connected with the wire clamp A, the other end of the current acquisition device A1 is connected with the fixed end of the sliding rheostat R1, one end of the current acquisition device A2 is connected with the wire clamp B, the other end of the current acquisition device A2 is connected with the fixed end of the sliding rheostat R2, one end of the current acquisition device A3 is connected with the wire clamp C, the other end of the current acquisition device A3 is connected with the fixed end of the sliding rheostat R3, one end of the relay RA is connected with the sliding end of the sliding rheostat R3, the other end of the relay RA is connected with one end of the relay RB, one end of a relay RC is connected between a relay RA and a relay RB, the other end of the relay RC is connected with the sliding end of a sliding rheostat R1, one ends of normally open contacts of a positive power supply switching relay VA1, a positive power supply switching relay VB1 and a positive power supply switching relay VC1 are respectively connected with the sliding ends of the sliding rheostat R1, the sliding rheostat R2 and the sliding rheostat R3, and the other ends of the normally open contacts of the positive power supply switching relay VA1, the positive power supply switching relay VB1 and the positive power supply switching relay VC1 are connected with the positive electrode of a direct-current power supply; one ends of normally open contacts of the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are respectively connected with sliding ends of the sliding rheostat R1, the sliding rheostat R2 and the sliding rheostat R3, and the other ends of the normally open contacts of the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are connected with the negative electrode of the direct-current power supply; voltage signals collected by a voltage collecting device V1 and current signals collected by a current collecting device A1 are respectively input into a first A/D conversion comparison module, voltage signals collected by a voltage collecting device V2 and current signals collected by a current collecting device A2 are respectively input into a second A/D conversion comparison module, voltage signals collected by a voltage collecting device V3 and current signals collected by a current collecting device A are respectively input into a third A/D conversion comparison module, and comparison result output ends of the first A/D conversion comparison module, the second A/D conversion comparison module and the third A/D conversion comparison module are connected with a data input end of a microcontroller; the microcontroller respectively outputs control signals to the control input ends of the variable color indicator lamp module LA, the variable color indicator lamp module LB and the variable color indicator lamp module LC to control the lighting and the light-emitting colors of the variable color indicator lamp module LA, the variable color indicator lamp module LB and the variable color indicator lamp module LC; the master-slave switch K is connected with a microcontroller, the relay RA, the relay RB, the relay RC, the positive power supply switching relay VA1, the positive power supply switching relay VB1, the positive power supply switching relay VC1, the negative power supply switching relay VA2, the negative power supply switching relay VB2 and the negative power supply switching relay VC2 are respectively provided with a MOSFET tube, one end of the relay RA coil, the relay RB coil, the relay RC coil, the positive power supply switching relay VA1 coil, the positive power supply switching relay VB1 coil, the positive power supply switching relay VC1 coil, the negative power supply switching relay VA2 coil, the negative power supply switching relay VB2 coil and the negative power supply switching relay VC2 coil is connected with a power supply VCC, and one end of the relay RA coil, the relay RB coil, the relay RC coil, the positive power supply switching relay VA1 coil, the positive power supply switching relay VB1 coil, the positive power supply switching relay VC1 coil, the relay RA, The other ends of the coil of the negative power supply switching relay VA2, the coil of the negative power supply switching relay VB2 and the coil of the negative power supply switching relay VC2 are respectively connected with the D electrodes of the MOSFET tubes which are respectively configured, the S electrodes of the MOSFET tubes are grounded, and the G electrodes of the MOSFET tubes are respectively connected with the microcontroller.
2. The nuclear phase meter before distribution network overlapping of claim 1, wherein the internal structures of the color-changeable indicator light module LA, the color-changeable indicator light module LB and the color-changeable indicator light module LC are as follows: the LED comprises a red-green bicolor LED, two current-limiting resistors and two MOSFET tubes, wherein the model of the red-green bicolor LED is LTST-C195KGJRKT, the anode of the red-green bicolor LED is connected with the anode of a power supply, the two cathodes of the red-green bicolor LED are respectively connected with the D poles of the respective MOSFET tubes after being respectively connected with the current-limiting resistors in series, the S poles of the two MOSFET tubes are both grounded, and the G poles of the two MOSFET tubes are respectively connected with a control port of a microcontroller.
3. The distribution network pre-lap nuclear phase instrument of claim 1, wherein the internal structures of the first, second and third A/D conversion and comparison modules are: the device comprises an A/D converter and a comparator, wherein the output end of the A/D converter is connected with the input end of the comparator, a comparison reference signal is input into the comparison input end of the comparator, and the output end of the comparator outputs a comparison result to the microcontroller.
4. The nuclear phase method of the nuclear phase instrument before the distribution network is lapped according to claim 1, which is characterized by comprising the following steps:
the wire clamp A, the wire clamp B and the wire clamp C of the host are respectively connected with A, B, C three phases of the fixed phase sequence end, and after the host and the slave are started, the host color-changeable indicator lamp LA module, the color-changeable indicator lamp LB module and the color-changeable indicator lamp LC module are respectively lightened into three colors of yellow, green and red; the host side is in short circuit B, C two phases, the slave computer starts a discrimination program, after the discrimination program is finished, the slave computer lights the color-changeable indicator lamp module of one phase without current into a yellow lamp, then the slave computer applies pulse voltage between the phase with current and the phase without current for n seconds, and the slave computer enters the next discrimination program after n seconds;
after receiving the pulse voltage signal, the host machine disconnects B, C two-phase short circuit connection, changes the short circuit connection into A, C two-phase short circuit connection, starts a judging program, after the judging program is finished, the slave machine lights the variable color indicator lamp module of one phase without current into a green lamp, then the pulse voltage signal is added between the phase with current and the phase without current for n seconds from the machine side, and the slave machine enters the next judging program after n seconds;
after the host receives the pulse voltage signal, the host disconnects A, C two-phase short circuit connection, changes the short circuit connection into A, B two-phase short circuit connection, starts a judging program, after the judging program of the slave is finished, the slave lights the color-changeable indicator lamp module without current for one phase into a red light, then the slave adds the pulse voltage between the current phase and the current-free phase for n seconds, after n seconds, the slave finishes the program, and after the host receives the pulse voltage signal, the host finishes the program;
the slave machine judging method comprises the following steps: under the state that the host machine is in short circuit with a certain two phases, the slave machine sequentially applies voltages between the AB two phases, the BC two phases and the AC two phases, detects A, B, C whether each phase has current, and checks for 3 times in sequence, wherein the phase without current is the phase that the host machine is not in short circuit, the slave machine lights a color-changeable indicator lamp module corresponding to the connected wire clamp, and displays corresponding colors, wherein A corresponds to yellow, B corresponds to green, and C corresponds to red.
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