CN108233528B - Power input control device - Google Patents

Abstract

A power input control device comprises a phase line and neutral line detection module, a controller, a first phase line, a second phase line, a third phase line and a neutral line; the input ends of the phase line and neutral line detection module are electrically connected with the first phase line, the second phase line, the third phase line and the neutral line in a one-to-one manner; the input ends of the controller are respectively and electrically connected with the output ends of the phase line and neutral line detection modules in a one-to-one manner; the phase line and neutral line detection module outputs the detected wiring parameters of the phase line and the neutral line to the controller, and the controller analyzes and outputs the wiring state according to the wiring parameters. The invention can detect the wiring state of the phase line and the neutral line and ensure the correct wiring.

Description

Power input control device

Technical Field

The invention relates to the technical field of power grids, in particular to a power input control device.

Background

An intelligent meter communication network deployed by adopting an Advanced Metering Infrastructure (AMI for short) mainly comprises a meter (meter), a main station and a communication system. In an AMI-based smart meter system (hereinafter, referred to as an "AMI smart meter system"), a Power Line Communication (PLC) technology is generally used. The master station performs data acquisition, management, control and the like on the PLC electric meter through a Data Concentrating Unit (DCU). And the DCU and the PLC electric meter adopt PLC technology communication.

In the networking process, the PLC electric meter and the DCU can carry out data transmission through the existing power line. The physical wiring of the power lines is of a tree-shaped topological structure, the transformer is a supply source of one transformer area, therefore, the source is divided into a plurality of power lines, and nodes on each power line share a communication medium. Because the low-voltage distribution of the current power industry generally adopts a three-phase four-wire system, in order to ensure that each phase of the PLC electric meter can communicate with the DCU, the DCU alternating-current power supply is generally a three-phase four-wire input.

The construction of the AMI intelligent electric meter system is usually carried out on the existing electric power supply system, and the DCU installation and wiring are directly carried out by virtue of the existing power distribution support. On the one hand, the power distribution support is seriously aged and lacks maintenance, and the condition that phase lines and neutral lines are difficult to distinguish exists. On the other hand, wiring according to the specified sequence has high implementation difficulty for field constructors, and the phenomenon that the phase line and the neutral line are connected in a wrong way is easy to occur.

Disclosure of Invention

The application provides a power input control device, which is used for timely detecting the wiring state of a phase line and a neutral line.

A first aspect provides a power input control apparatus comprising:

the device comprises a phase line and neutral line detection module, a controller, a first phase line, a second phase line, a third phase line and a neutral line;

the input ends of the phase line and neutral line detection module are electrically connected with the first phase line, the second phase line, the third phase line and the neutral line in a one-to-one manner;

the input ends of the controller are respectively and electrically connected with the output ends of the phase line and neutral line detection modules in a one-to-one manner;

the phase line and neutral line detection module outputs the detected wiring parameters of the phase line and the neutral line to the controller, and the controller analyzes and outputs the wiring state according to the wiring parameters.

In the first aspect, the power input control device is provided with a phase line and neutral line detection module, which can detect the connection state of the phase line and the neutral line and send the connection state to the controller, and if the connection state is wrong or phase-missing, the controller can output an alarm prompt of phase-missing or wiring error, so that a maintenance worker can find the connection problem or the phase-missing problem in time.

With reference to the first aspect, in a first possible embodiment of the first aspect, the phase and neutral line detection module includes a first sub-detection module, a second sub-detection module, and a third sub-detection module;

the first input end of the first sub-detection module is electrically connected to the first phase line, the first input end of the second sub-detection module is electrically connected to the second phase line, and the first input end of the third sub-detection module is electrically connected to the third phase line;

the second input end of the first sub-detection module, the second input end of the second sub-detection module and the second input end of the third sub-detection module are respectively and electrically connected to the neutral line;

the output end of the first sub-detection module is electrically connected to the first input end of the controller, the output end of the second sub-detection module is electrically connected to the second input end of the controller, and the output end of the third sub-detection module is electrically connected to the third input end of the controller.

In combination with the first possible embodiment of the first aspect, in a second possible embodiment of the first aspect,

the first sub-detection module comprises a first power frequency transformer, a first rectifier bridge and a first voltage comparator;

the first input end of the first power frequency transformer is electrically connected to the first phase line, and the second input end of the first power frequency transformer is electrically connected to the neutral line;

the first input end of the first rectifier bridge is electrically connected to the first output end of the first power frequency transformer, and the second input end of the first rectifier bridge is electrically connected to the second output end of the first power frequency transformer;

a first input end of the first voltage comparator is electrically connected to a first output end of the first rectifier bridge, and a second input end of the first voltage comparator is electrically connected to a second output end of the first rectifier bridge;

the output end of the first voltage comparator is electrically connected with the first input end of the controller;

the first power frequency transformer outputs the alternating current power supply of the first phase line and the neutral line after voltage conversion to the first rectifier bridge, the first rectifier bridge outputs the direct current power supply obtained after direct current conversion of the alternating current power supply to the first voltage comparator, the first voltage comparator obtains a logic level according to the direct current power supply and outputs the logic level to the controller, and the controller analyzes and outputs a wiring state according to the logic level.

With reference to the second possible embodiment of the first aspect, in a third possible embodiment of the first aspect, the first sub-detection module further includes a first transistor, and the first transistor is electrically connected to the first output end of the first rectifier bridge;

the first rectifier bridge outputs direct current power to the first transistor, and the first transistor monitors conduction parameters of the first phase line and the neutral line according to the direct current power and outputs the conduction parameters to the controller; the conduction parameter is a wiring parameter of the first phase line and the first neutral line.

In a third possible embodiment of the first aspect, the conduction parameter is obtained by a transistor, and the conduction parameter can be used to determine whether a phase failure occurs.

With reference to the first aspect, in a fourth possible embodiment of the first aspect, the first sub-detection module includes a first optical coupler;

the first input end of the first optical coupler is electrically connected to the first phase line, and the second input end of the first optical coupler is electrically connected to the neutral line;

the output end of the first optical coupler is electrically connected with the first input end of the controller;

the first optical coupler converts alternating current power output by the first phase line and the neutral line into a first pulse signal and outputs the first pulse signal to the controller, wherein the first pulse signal is a wiring parameter of the first phase line and the neutral line.

With reference to the fourth possible embodiment of the first aspect, in a fifth possible embodiment of the first aspect, the controller compares, according to the first pulse signal, a falling edge time difference between a second pulse signal output by the second optical coupler in the second sub-detection module and a third pulse signal output by the third optical coupler in the third sub-detection module, with a preset threshold, analyzes and outputs the wiring state.

With reference to the first aspect, any one of the first possible embodiment to the fifth possible embodiment of the first aspect, in a sixth possible embodiment of the first aspect, the apparatus further includes a phase and neutral adjusting module;

the first power input end of the phase line and neutral line adjusting module is electrically connected with the first phase line;

the second power input end of the phase line and neutral line adjusting module is electrically connected with the second phase line;

the third power input end of the phase line and neutral line adjusting module is electrically connected with the third phase line;

the fourth power input end of the phase line and neutral line adjusting module is electrically connected with the neutral line;

the control input end of the phase line and neutral line adjusting module is electrically connected with the first output end of the controller;

and if the controller analyzes that the wiring state is an abnormal state, the controller sends a wiring control instruction to the phase line and neutral line adjusting module, and the phase line and neutral line adjusting module adjusts the wiring state according to the wiring control instruction.

In a sixth possible embodiment of the first aspect, the power input control device may further include a phase line and neutral line adjusting module, and when a wiring problem or a phase failure problem is found, the wiring may be adjusted in time through a single-pole double-throw switch in the phase line and neutral line adjusting module, so as to effectively improve the efficiency of adjusting the wiring state.

With reference to the sixth possible embodiment of the first aspect, in a seventh possible embodiment of the first aspect, the phase and neutral adjusting module includes a first sub-adjusting module, a second sub-adjusting module, and a third sub-adjusting module;

the first sub-adjusting module comprises a first single-pole double-throw relay and a second single-pole double-throw relay;

the second sub-regulation module comprises a third single-pole double-throw relay;

the third sub-adjusting module comprises a fourth single-pole double-throw relay, a fifth single-pole double-throw relay, a sixth single-pole double-throw relay and a seventh single-pole double-throw relay;

when the controller determines to adjust the wiring state, the controller sends a wiring control instruction to the phase line and neutral line adjusting module, and the phase line and neutral line adjusting module selects a target single-pole double-throw relay from the first single-pole double-throw relay to the seventh single-pole double-throw relay according to the wiring control instruction and performs closing control on the target single-pole double-throw relay to adjust the wiring state of the phase line and the neutral line.

With reference to the seventh possible embodiment of the first aspect, in an eighth possible embodiment of the first aspect, the apparatus further includes a power line carrier unit PLC module, where the PLC module includes a first phase input terminal, a second phase input terminal, a third phase input terminal, and a neutral input terminal;

a first power input end of the phase and neutral line adjusting module comprises a pole of the first single-pole double-throw relay; a second power input end of the phase and neutral line adjusting module comprises a pole of the second single-pole double-throw relay;

if the third power input end of the phase and neutral adjustment module comprises the pole of the third single-pole double-throw relay, the fourth power input end of the phase and neutral adjustment module comprises the poles of the fourth single-pole double-throw relay to the seventh single-pole double-throw relay;

if the third power input end of the phase and neutral line adjusting module comprises the pole of the fourth single-pole double-throw relay to the pole of the seventh single-pole double-throw relay, the fourth power input end of the phase and neutral line adjusting module comprises the pole of the third single-pole double-throw relay;

a first contact of the first single-pole double-throw relay and a second contact of the fifth single-pole double-throw relay are respectively and electrically connected to a first phase line input end of the PLC module, a first contact of the second single-pole double-throw relay and a second contact of the sixth single-pole double-throw relay are respectively and electrically connected to a second phase line input end of the PLC module, and a first contact of the third single-pole double-throw relay and a second contact of the seventh single-pole double-throw relay are respectively and electrically connected to a third phase line input end of the PLC module;

the second contact of the first single-pole double-throw relay, the second contact of the second single-pole double-throw relay, the second contact of the third single-pole double-throw relay and the first contact of the fourth single-pole double-throw relay are respectively and electrically connected to the neutral line access end of the PLC module;

the second contact of the fourth single-pole double-throw relay, the first contact of the fifth single-pole double-throw relay, the first contact of the sixth single-pole double-throw relay and the first contact of the seventh single-pole double-throw relay are respectively suspended.

With reference to the seventh possible embodiment of the first aspect, in a ninth possible embodiment of the first aspect, the apparatus further includes a data concentration unit DCU interface module, where the DCU interface module includes a first phase input terminal, a second phase input terminal, a third phase input terminal, and a neutral input terminal;

a first power input end of the phase and neutral line adjusting module comprises a pole of the first single-pole double-throw relay; a second power input end of the phase and neutral line adjusting module comprises a pole of the second single-pole double-throw relay;

if the third power input end of the phase and neutral adjustment module comprises the pole of the third single-pole double-throw relay, the fourth power input end of the phase and neutral adjustment module comprises the poles of the fourth single-pole double-throw relay to the seventh single-pole double-throw relay;

if the third power input end of the phase and neutral line adjusting module comprises the pole of the fourth single-pole double-throw relay to the pole of the seventh single-pole double-throw relay, the fourth power input end of the phase and neutral line adjusting module comprises the pole of the third single-pole double-throw relay;

a first contact of the first single-pole double-throw relay and a second contact of the fifth single-pole double-throw relay are respectively and electrically connected to a first phase line input end of the DCU interface module, a first contact of the second single-pole double-throw relay and a second contact of the sixth single-pole double-throw relay are respectively and electrically connected to a second phase line input end of the DCU interface module, and a first contact of the third single-pole double-throw relay and a second contact of the seventh single-pole double-throw relay are respectively and electrically connected to a third phase line input end of the DCU interface module;

the second contact of the first single-pole double-throw relay, the second contact of the second single-pole double-throw relay, the second contact of the third single-pole double-throw relay and the first contact of the fourth single-pole double-throw relay are respectively and electrically connected to the neutral line access end of the DCU interface module;

the second contact of the fourth single-pole double-throw relay, the first contact of the fifth single-pole double-throw relay, the first contact of the sixth single-pole double-throw relay and the first contact of the seventh single-pole double-throw relay are respectively suspended.

Drawings

Fig. 1 is a schematic diagram of a three-phase four-wire power transmission line provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a power input control device according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a first structure of a phase and neutral detection module according to an embodiment of the present invention;

fig. 4 is a second structural diagram of the phase and neutral detection modules according to the embodiment of the present invention;

FIG. 5 is a first three-phase vector diagram provided by an embodiment of the present invention;

FIG. 6 is a pulse sequence diagram of a first output provided by an embodiment of the present invention;

FIG. 7 is a second three-phase vector diagram provided in accordance with an embodiment of the present invention;

FIG. 8 is a pulse sequence diagram of a second output provided by an embodiment of the present invention;

FIG. 9 is a third three-phase vector diagram provided by an embodiment of the present invention;

FIG. 10 is a pulse sequence diagram of a third output provided by an embodiment of the present invention;

FIG. 11 is a fourth three-phase vector diagram provided by an embodiment of the present invention;

FIG. 12 is a pulse sequence diagram of a fourth output provided by an embodiment of the present invention;

fig. 13 is a schematic flowchart of a pulse sequence detection method according to an embodiment of the present invention;

fig. 14 is a schematic flowchart of a method for determining a connection state according to an embodiment of the present invention;

fig. 15 is a first schematic structural diagram of a phase and neutral adjustment module according to an embodiment of the present invention;

fig. 16 is a second structural diagram of the phase and neutral adjusting module according to the embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In low-voltage distribution networks, the transmission lines are generally of a three-phase four-wire system. Fig. 1 is a schematic diagram of a three-phase four-wire power transmission line according to an embodiment of the present invention. As shown in fig. 1, the transmission of power from the low-voltage distribution network to the user terminals is mainly based on four lines, three phase lines of which are respectively represented by A, B and C, and the other line is a neutral line N (if the neutral point on the power supply side of the loop is grounded, the neutral line is also called a neutral line). The three-phase AC power supply consists of three AC potentials with the same frequency, equal amplitude and phase difference of 120 deg.

In fig. 1, both the PLC module and the DCU interface module can be connected to a three-phase four-wire power transmission line. The PLC module can utilize the existing power line to transmit analog or digital signals at high speed in a carrier mode, so that power carrier communication is realized. The DCU interface module may be referred to as a central point of cable junction, for example, in a remote electric power meter reading system, terminals such as meter 1 and meter 2 … … in the figure are respectively connected with a phase line and a neutral line, and data read by each meter is transmitted to a computer or communication equipment of a control center through the DCU interface module. During the construction of the AMI smart meter system, a constructor may make a wrong connection between a phase line and a neutral line by a human judgment, for example, assume that a first line, a second line, a third line and a fourth line of the four lines from top to bottom in the drawing are represented by A, B, C and N, respectively, as shown in fig. 1, actually, the connection lines of the first line, the second line, the third line and the fourth line sequentially correspond to A, N, C and B, that is, the connection lines of N and B are wrong, which may cause voltage increase at two ends of some devices, such as the meter, and may easily cause damage to the meter.

In the embodiment of the invention, aiming at the problem that the phase line and the neutral line are easy to have wiring errors (for example, the phase line B and the neutral line N are reversely connected), the wiring states of the phase line and the neutral line are detected by adding the phase line and neutral line detection module, and the wrong wiring can be further adjusted in time by adding the phase line and neutral line adjustment module, so that the wiring is ensured to be correct.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a power input control device according to an embodiment of the present invention. As shown in fig. 2, the power input control device 100 includes a phase and neutral detection module 110, a controller 120, a first phase line 131, a second phase line 132, a third phase line 133, and a neutral line 140.

The phase and neutral detection module 110 can be used to detect whether the phase and neutral wires are abnormally connected, and includes a first sub-detection module 111, a second sub-detection module 112, and a third sub-detection module 113 (not shown in fig. 2), where each sub-detection module includes two input terminals and one output terminal.

The first input terminal of the first sub-detection module 111 is electrically connected to the first phase line 131, the first input terminal of the second sub-detection module 112 is electrically connected to the second phase line 132, and the first input terminal of the third sub-detection module 113 is electrically connected to the third phase line 133. The second input terminal of the first sub-detection module 111, the second input terminal of the second sub-detection module 112, and the second input terminal of the third sub-detection module 113 are electrically connected to the neutral line 140, respectively.

The controller 120 may be a processor or a programmable logic device including a first input, a second input, and a third input. The respective inputs of the controller 120 are electrically connected to the respective outputs of the phase and neutral detection module 110, one for one. That is, the output terminal of the first sub-detection module 111 is electrically connected to the first input terminal of the controller 120, the output terminal of the second sub-detection module 112 is electrically connected to the second input terminal of the controller 120, and the output terminal of the third sub-detection module 113 is electrically connected to the third input terminal of the controller 120.

The phase and neutral detection module 110 outputs the detected connection parameters of the phase and neutral wires to the controller 120, and the controller 120 analyzes and outputs the connection state according to the connection parameters.

Optionally, the power input control device 100 further includes a phase and neutral adjusting module 150 for adjusting the connection status of the phase and neutral wires. The phase and neutral adjustment module 150 includes a first power input terminal, a second power input terminal, a third power input terminal, a fourth power input terminal, and a control input terminal, wherein the first power input terminal of the phase and neutral adjustment module 150 is electrically connected to the first phase line 131, the second power input terminal of the phase and neutral adjustment module 150 is electrically connected to the second phase line 132, the third power input terminal of the phase and neutral adjustment module 150 is electrically connected to the third phase line 133, and the fourth power input terminal of the phase and neutral adjustment module 150 is electrically connected to the neutral 140; a control input of the phase and neutral adjustment module 150 is electrically coupled to a first output of the controller 120. If the controller 120 analyzes that the connection status is abnormal, for example, any of the phase lines and the neutral lines 140 are connected reversely, the controller 120 sends a connection control instruction to the phase line and neutral line adjusting module 150, and the phase line and neutral line adjusting module 150 adjusts the connection status according to the connection control instruction.

The power input control device 100 may also include a PLC module 160 and/or a DCU interface module 170. The PLC module 160 includes a first phase input 161, a second phase input 162, a third phase input 163, and a neutral input 164, each electrically connected to an output of the neutral adjustment module 150, for PCL communication. The DCU interface module 170 includes a first phase input 171, a second phase input 172, a third phase input 173, and a neutral input 174, each electrically connected to an output of the neutral adjustment module 150, for connection to a DCU.

It can be understood that, in the embodiment of the present invention, by providing the phase line and neutral line detection module in the power input control device, the connection state of the phase line and the neutral line can be detected and sent to the controller, for example, a connection error or a phase failure, and the controller can output an alarm prompt of the phase failure or the connection error, so that a maintenance worker can find the connection problem or the phase failure problem in time. The power input control device can also be provided with a phase line and neutral line adjusting module, when the wiring problem or the phase failure problem is found, the wiring can be timely adjusted through a single-pole double-throw switch in the phase line and neutral line adjusting module, and the wiring state adjusting efficiency can be effectively improved.

Referring to fig. 3, fig. 3 is a schematic view of a first structure of a phase line and neutral line detection module according to an embodiment of the present invention. As shown in fig. 3, the phase and neutral detection module 110 includes a first sub-detection module, a first sub-detection module 111, a second sub-detection module 112, and a third sub-detection module 113. In the embodiment of the present invention, the first sub-detecting module 111 is taken as an example, and the other two sub-detecting modules refer to the description of the first sub-detecting module.

The first sub-detection module comprises a first industrial frequency transformer 1111, a first rectifier bridge 1112 and a first voltage comparator 1113; the second sub-detection module 112 includes a second power frequency transformer 1121, a second rectifier bridge 1122 and a second voltage comparator 1123; the third sub-detection module includes 113 a third power frequency transformer 1131, a third rectifier bridge 1132 and a third voltage comparator 1133.

The first industrial frequency transformer 1111 comprises two input terminals and two output terminals, wherein a first input terminal of the first industrial frequency transformer 1111 is electrically connected to the first phase line 131, and a second input terminal of the first industrial frequency transformer 1111 is electrically connected to the neutral line 140.

The first rectifier bridge 1112 comprises two input terminals and two output terminals, wherein a first input terminal of the first rectifier bridge 1112 is electrically connected to a first output terminal of the first industrial frequency transformer 1111, and a second input terminal of the first rectifier bridge 1112 is electrically connected to a second output terminal of the first industrial frequency transformer 1111.

The first voltage comparator 1113 comprises two input terminals and an output terminal, wherein the first input terminal of the first voltage comparator 1113 is electrically connected to the first output terminal of the first rectifier bridge 1112, the second input terminal of the first voltage comparator 1113 is electrically connected to the second output terminal of the first rectifier bridge 1112, and the output terminal of the first voltage comparator 1113 is electrically connected to the first input terminal of the controller 120.

The first industrial frequency transformer 1111 outputs the voltage-converted ac power of the first phase line 131 and the neutral line 140 to the first rectifier bridge 1112, the first rectifier bridge 1112 outputs the dc power obtained by dc converting the ac power to the first voltage comparator 1113, the first voltage comparator 1113 obtains a logic level according to the dc power and outputs the logic level to the controller 120, and the controller 120 analyzes and outputs the wiring state according to the logic level.

Taking an electric network with a rated voltage of 220V as an example, the input voltage of the first sub-detection module 111 is 220V, the voltage threshold of the first voltage comparator 1113 is 8V, and the transformation ratio of the first industrial frequency transformer 1111 is 220/5-44. In a normal connection situation, the first commercial transformer 1111 outputs 5V (effective value of ac voltage), and the dc voltage output by the corresponding three rectifier bridges is 5 × 1.41 — 7.05V (i.e., the peak value of the ac voltage output by the first commercial transformer 1111, which is the effective value of ac voltage

And the value is 1.41 for convenient calculation), and the direct current voltage is smaller than the reference voltage (voltage threshold value). If the outputs of the first voltage comparator 1113, the second voltage comparator 1123, and the third voltage comparator 1133 are all logic "0", the final output connection parameter of the phase and neutral detection module 110 is "000".

When the wiring is wrong, for example, the second phase line 132 and the neutral line 140 are connected reversely, the first sub-detection module 111 and the third sub-detection module 113 input line voltages, the voltage value is 380V, the first industrial frequency transformer 1111 and the third industrial frequency transformer 1131 output voltages 380/(220/5) ═ 8.636V, the corresponding first rectifier bridge 1112 and third rectifier bridge 1132 output dc voltages 8.636 ≈ 1.41 ≈ 12.18V, the dc voltages are greater than the reference voltage (voltage threshold), the first voltage comparator 1113 and the third voltage comparator 1133 output logic '1', and the output of the second voltage comparator 1122 in the second sub-detection module 112 corresponding to the second phase line 132 remains '0'. The phase and neutral detection module 110 finally outputs a state of "101" (wiring parameter). Similarly, if the first phase line 131 and the neutral line 140 are reversely connected, the final output connection parameter of the phase line and neutral line detection module 110 is "011"; if the third phase line 133 and the neutral line 140 are reversely connected, the final output connection parameter of the phase line and neutral line detection module 110 is "110".

Optionally, the first sub-detection module 111 may further include a first transistor 1114, the first transistor 1114 is electrically connected to a first output terminal of the first rectifier bridge 1112, the second sub-detection module 112 may further include a second transistor 1114 (the transistor may be a triode), the first transistor 1114 is electrically connected to a first output terminal of the first rectifier bridge 1112, the first sub-detection module 111 may further include the first transistor 1114, and the first transistor 1114 is electrically connected to a first output terminal of the first rectifier bridge 1112. With the first transistor 1114 and the necessary resistors, phase loss detection can be achieved. When the first rectifier bridge 1112 outputs the dc power to the first transistor 1114, the first transistor 1114 monitors the conduction parameters of the first phase line 131 and the neutral line 140 according to the dc power and outputs the conduction parameters to the controller 120; the conduction parameter is one of wiring parameters of the phase line and the neutral line.

For example, when the collector level states of the first transistor 1114, the second transistor 1124 and the third transistor 1134 are "000", i.e. the turn-on parameter is "000", the transistors are all turned on. If the first transistor 1114 has no input and the second transistor 1124 and the third transistor 1134 both have outputs, the first transistor 1114 is turned off, the second transistor 1124 and the third transistor 1134 are turned on, and the on parameter corresponding to the on states of the three transistors is "100", which indicates that the first sub-detection module 111 has an input open phase.

It can be understood that, in the embodiment of the invention, the detection of the wiring state or the phase-lack state of each phase is realized by the phase line and neutral line detection module and the power frequency transformer, the rectifier bridge and the voltage comparator, so that the wiring problem can be found in time.

Referring to fig. 4, fig. 4 is a second structural schematic diagram of the phase line and neutral line detection module according to an embodiment of the present invention. As shown in fig. 4, the phase and neutral detection module 110 includes a first sub-detection module 111, a second sub-detection module 112 and a third sub-detection module 113, where the first sub-detection module 111 is taken as an example in the embodiment of the present invention, and the other two sub-detection modules are described with reference to the first sub-detection module.

The first sub-detection module 111 includes a first photo-coupler 1111. A first input of first optocoupler 1111 is electrically connected to first phase line 131 and a second input of first optocoupler 1111 is electrically connected to neutral line 140.

The output terminal of the first optocoupler 1111 is electrically connected to the first input terminal of the controller 120.

The first photocoupler 1111 converts the ac power outputted from the first phase line 131 and the neutral line 140 into a first pulse signal, and outputs the first pulse signal to the controller 120, where the first pulse signal is a connection parameter of the first phase line 131 and the neutral line 140. The controller 120 compares the falling edge time difference between the second optical coupler 1121 of the second sub-detection module 112 and the third optical coupler 1131 of the third sub-detection module 113 with a preset threshold according to the first pulse signal, analyzes and outputs the wiring state.

In the embodiment of the invention, an optical coupler is adopted to detect the zero crossing point of three phases, the optical coupler is not conducted near the zero crossing point, the optical coupler is conducted after the zero crossing point, a pulse signal current is generated, and the period of the pulse signal is the same as the three-phase power input frequency. The controller 120 can identify whether the phase line and the neutral line are connected reversely and whether the phase is short by detecting the time intervals and the existence of the three-way pulse signals, and the determination method executed by the controller 120 is as follows.

Analyzing the input voltage phase of each optical coupler under the condition of reverse connection of wires

Referring to fig. 5, fig. 5 is a first three-phase vector diagram according to an embodiment of the present invention. As shown in figure 5 of the drawings,

and

phase voltages corresponding to the fighting optical coupler are respectively identified, and the three-phase electric vector expression is as follows:

for example, the frequency of the three phases is 50Hz, the period is 20ms, the three phases are separated by 120 degrees, and the phase is separated by 6.67ms (20/3 ms). In the case of a normal wiring sequence, as shown in fig. 6, a pulse sequence diagram of a first output is provided for one embodiment of the present invention.

1) If phase B is connected to phase N in the opposite direction, the input voltage corresponding to the second optical coupler 1121 changes, and the three-phase vector diagram after the connection in the opposite direction is shown in fig. 7, where fig. 7 is a second three-phase vector diagram provided by an embodiment of the present invention, which is specifically as follows:

(1)

(2)

i.e. 180 degrees from the original phase;

(3)

suppose a three-phase circuit phase voltage

Adopt, U₁、U₂And U₃Respectively representing the input voltages of the three-way optical coupler, and deriving the input voltages of the three-way optical coupler by using a vector methodPress and press

Therefore, the input voltage of the optical coupler is U in phase₂Than U₁Input advanced by 30 ° (60 ° -30 °), U₃Than U₁The input is advanced by 60 ° (90 ° -30 °). FIG. 8 is a pulse sequence diagram of a second output according to an embodiment of the present invention, shown in FIG. 8, P₁、P₂And P₃Respectively representing the output signals of the three-way optical coupler, wherein P₂And P₁Spaced in phase by 1.67ms (20/12ms), P₃And P₁The phase is spaced 3.33ms (20/6ms) apart.

2) Similarly, when a and N are connected inversely, the input voltage corresponding to the first optical coupler 1111 changes, fig. 9 is a third three-phase vector diagram according to an embodiment of the present invention, as shown in fig. 9, the input voltage of the three-way optical coupler can be derived by using a vector method as follows:

(1)U₁＝-U_A＝U∠180°；

(2)U₂＝U_BA＝U∠-150°；

(3)U₃＝U_CA＝U∠150°；

reference is made to U1, i.e. U₁＝U∠0°，

Therefore, the input voltage of the optical coupler is U in phase₂Than U₁Input leads by 30 DEG U₃Than U₁The input leads-30. FIG. 10 is a pulse sequence diagram of a third output provided by an embodiment of the present invention, as shown in FIG. 10, P₁、P₂And P₃Respectively representing the output signals of the three-way optical coupler, wherein P₂And P₁Spaced in phase by 1.67ms (20/12ms), P₃And P₁The phase is spaced-1.67 ms (-20/12 ms).

3) Similarly, when C and N are connected inversely, the input voltage corresponding to the third optical coupler 1131 changes, fig. 11 is a fourth three-phase vector diagram provided in an embodiment of the present invention, as shown in fig. 11, and the input voltage of the three-way optical coupler can be derived by using a vector method as follows:

(1)U₁＝-U_AC＝*U∠-30°；

(2)U₂＝U_BC＝*U∠-90°；

(3)U₃＝-U_C＝U∠-60°；

reference is made to U1, i.e. U₁＝U∠0°，

U₃Equal to U < 30 degrees. Therefore, the input voltage of the optical coupler is U in phase₂Than U₁Input leads to-60 DEG, U₃Than U₁Input lead-30, FIG. 12 is a pulse sequence diagram of a fourth output provided by an embodiment of the present invention, as shown in FIG. 12, P₁、P₂And P₃Respectively representing the output signals of the three-way optical coupler, wherein P₂And P₁Spaced-3.33 ms (-20/6ms) in phase, P₃And P₁The phase is spaced-1.67 ms (-20/12 ms).

(II) judging the connection state of each optical coupler

1) Phase loss state detection

And detecting whether three paths of pulse signals output by the first optical coupler 1111, the second optical coupler 1121 and the third optical coupler 1131 exist or not within a timing period (more than 20ms), if so, indicating that the phase is not lost, otherwise, indicating that the phase is lost, and judging a phase loss state according to the pulse signals and sending a phase loss alarm.

2) Without phase loss, the wiring state is detected

The pulse signals output by the first optical coupler 1111, the second optical coupler 1121, and the third optical coupler 1131 are P signals₁、P₂And P₃Showing that a counter is set for detecting the wiring state, and the specific steps can be referred toReferring to fig. 13, fig. 13 is a schematic flowchart of a pulse sequence detection method according to an embodiment of the present invention, where the method may include steps S101 to S108.

S101, triggering a counter to start counting by using the P1 falling edge, and recording the corresponding falling edge time as T₁；

S102, if P is detected₂Corresponding falling edge, recording the time as T₂；

S103, if P is detected₃Corresponding falling edge, recording the time as T₃；

S104, detecting whether P is received₁If not, executing step S105; if yes, go to step S106;

s105, continuing timing;

s106, respectively calculating T in a period₁To T₂And T₁To T₃The time difference therebetween, i.e. Δ t₁＝T₂-T₁，Δt₂＝T₃-T₁；

S107, adding P₁Zero clearing of the timer, P₂/P₃Clearing a falling edge mark;

and S108, finishing the detection and starting the next timing period.

Obtaining delta t according to the steps₁And Δ t₂After the value, the value can be judged by delta t₁、Δt₂The numerical range determines the wiring state, and the wiring state mainly comprises four conditions of normal wiring, reverse connection of B and N, reverse connection of A and N and reverse connection of C and N.

(1) Normal wiring: Δ t₁＝6.67ms(20/3ms)，Δt₂＝(20-6.67)ms＝13.33ms；

(2) B and N are connected reversely: Δ t₁＝1.67ms(20/12ms)，Δt₂＝(20/6ms)ms＝3.33ms；

(3) A and N are connected reversely: Δ t₁＝(20-1.67)ms＝18.33ms，Δt₂＝1.67ms；

(4) C and N are connected reversely: Δ t₁＝3.33ms，Δt₂＝1.67ms；

According to the above parametersThe value sets the corresponding decision threshold (e.g. 6ms)<Δt₁<7ms，12.8ms<Δt₂<At 14ms, it may be determined that the wiring is normal), and then determine the wiring states of the phase line and the neutral line, referring to fig. 14, a flowchart of the wiring state determination method is shown in fig. 14, where fig. 14 is a flowchart of a wiring state determination method according to an embodiment of the present invention, and the method may include S201 to S210.

S201, start to judge delta t₁、Δt₂Determining the wiring state by the numerical range;

s202, judging delta t₁And Δ t₂Whether all satisfy 6ms<Δt₁<7ms，12.8ms<Δt₂<14ms；

S203, determining that the wiring state is normal;

specifically, if the judgment in S202 is yes, it is determined that the wiring state is normal, and step S210 is executed; if the determination at 202 is no, step S204 is further performed.

S204, judging delta t₁And Δ t₂Whether all satisfy 1ms<Δt₁<2ms，2.8ms<Δt₂<4ms；

S205, determining that the wiring state is that B and N are reversely connected;

specifically, if the determination in S204 is yes, it is determined that the wiring state is that B and N are connected in reverse, and step S210 is executed; if the determination of S204 is no, then step S206 is further performed;

s206, judging Delta t₁And Δ t₂Whether all satisfy 17.8ms<Δt₁<19ms，1ms<Δt₂<2ms；

S207, determining that the connection state is that A is reversely connected with N;

specifically, if the determination in S206 is yes, it is determined that the connection state is that a and N are reversed, and step S210 is executed; if the determination at S206 is no, then step S208 is further performed;

s208, determining Delta t₁And Δ t₂Whether all satisfy 2.8ms<Δt₁<4ms，1ms<Δt₂<2ms；

S209, determining that the connection state is that C is reversely connected with N;

specifically, if the judgment in S208 is yes, it is determined that the connection state is that C and N are reversely connected, and step S210 is executed; if the determination at S206 is no, then step S210 is further performed;

and S210, ending the judgment.

It can be understood that, in the embodiment of the present invention, the detection of the connection state or the phase-missing state of each phase is realized through the optical coupler and the corresponding algorithm, and the connection problem can be found in time.

Referring to fig. 15 to 16, fig. 15 is a first structural schematic diagram of a phase and neutral adjusting module according to an embodiment of the present invention, and fig. 16 is a second structural schematic diagram of the phase and neutral adjusting module according to an embodiment of the present invention. As shown in fig. 15 to 16, the phase and neutral adjusting module 150 includes a first sub-adjusting module 151, a second sub-adjusting module 152, and a third sub-adjusting module 153, the first sub-adjusting module 151 includes a first single-pole double-throw relay 1511 and a second single-pole double-throw relay 1512, the second sub-adjusting module 152 includes a third single-pole double-throw relay 1521, and the third sub-adjusting module 153 includes a fourth single-pole double-throw relay 1531, a fifth single-pole double-throw relay 1532, a sixth single-pole double-throw relay 1533, and a seventh single-pole double-throw relay 1534.

As shown in fig. 15, the power input control device 100 further includes a PLC module 160, and the PLC module 160 includes a first phase input terminal 161, a second phase input terminal 162, a third phase input terminal 163, and a neutral input terminal 164, and F1, F2, and F3 represent fuses.

A first power input of the phase and neutral adjustment module 150 is electrically connected to the first phase line 131, wherein the first power input of the phase and neutral adjustment module 150 includes a pole of a first single pole, double throw relay 1511. A second power input of the phase and neutral adjustment module 150 is electrically connected to the second phase 132, wherein the second power input of the phase and neutral adjustment module 150 includes a pole of a second single pole, double throw relay 1512. That is, the pole of the first single-pole double-throw relay 1511 is electrically connected to the first phase line 131, and the pole of the second single-pole double-throw relay 1512 is electrically connected to the second phase line 132.

The third power input of the phase and neutral trim module 150 is electrically connected to the third phase line 133 and the fourth power input of the phase and neutral trim module 150 is electrically connected to the neutral line 140. Two cases are included: in the first case, if the third power input of the phase and neutral adjustment module 150 includes the pole of the third single-pole double-throw relay 1521, the fourth power input of the phase and neutral adjustment module 150 includes the poles of the fourth single-pole double-throw relay 1531 to the seventh single-pole double-throw relay 1534, that is, if the pole of the first single-pole double-throw relay 1511 is electrically connected to the third phase line 133, the poles of the fourth single-pole double-throw relay 1531 to the seventh single-pole double-throw relay 1534 are electrically connected to the neutral line 140; in the second case, if the third power input of the phase and neutral adjustment module 150 includes the pole of the fourth single-pole double-throw relay 1531 to the pole of the seventh single-pole double-throw relay 1534, the fourth power input of the phase and neutral adjustment module 150 includes the pole of the third single-pole double-throw relay 1521, that is, if the pole of the first single-pole double-throw relay 1511 is electrically connected to the neutral 140, the poles of the fourth single-pole double-throw relay 1531 to the seventh single-pole double-throw relay 1534 are electrically connected to the third phase line 153133.

A first contact of the first single-pole double-throw relay 1511 and a second contact of the fifth single-pole double-throw relay 1532 are electrically connected to the first phase input 161 of the PLC module 160, a first contact of the second single-pole double-throw relay 1512 and a second contact of the sixth single-pole double-throw relay 1533 are electrically connected to the second phase input 162 of the PLC module 160, and a first contact of the third single-pole double-throw relay 1521 and a second contact of the seventh single-pole double-throw relay 1534 are electrically connected to the third phase input 163 of the PLC module 160.

The second contact of the first single-pole double-throw relay 1511, the second contact of the second single-pole double-throw relay 1512, the second contact of the third single-pole double-throw relay 1521, and the first contact of the fourth single-pole double-throw relay 1531 are electrically connected to the neutral line access terminal 164 of the PLC module 160, respectively.

The second contact of the fourth single-pole double-throw relay 1531, the first contact of the fifth single-pole double-throw relay 1532, the first contact of the sixth single-pole double-throw relay 1533, and the first contact of the seventh single-pole double-throw relay 1534 are respectively floating.

A control input of the phase and neutral adjustment module 150 is electrically coupled to a first output of the controller 120.

When the controller 120 determines to adjust the connection state, the controller 120 sends a connection control instruction to the phase and neutral adjusting module 150, and the phase and neutral adjusting module 150 selects the target single-pole double-throw relay 151 according to the connection control instruction, and performs closing control on the target single-pole double-throw relay 151 to adjust the connection state of the phase and neutral.

As shown in fig. 15, if the second phase line 132 is connected to the neutral line 140 in the reverse direction, the poles of the second single-pole double-throw relay 1511, the fourth single-pole double-throw relay 1531, and the sixth single-pole double-throw relay 1533 need to be switched to another contact not connected to the current state, so as to adjust the reverse connection state of the second phase line 132 to the neutral line 140. The single-pole double-throw relay has the following action sequence: the pole of the fourth single-pole double-throw relay 1531 is switched to the other contact not connected currently, so that the original N phase (actually, B phase) is disconnected; the pole of the second single-pole double-throw relay 1511 is switched to another contact not connected with the current, so that the original B phase (actually, N phase) is switched to the N input channel; the pole of the sixth single-pole double-throw relay 1533 is switched to the other contact not connected currently, so that the original N phase (actually, the B phase) is switched to the B input channel; other relays are kept in the original state, and a certain delay time can be set between each switching.

Similarly, if the first phase line 131 and the neutral line 140 are connected in reverse, the poles of the first single-pole double-throw relay 1511, the fourth single-pole double-throw relay 1531, and the fifth single-pole double-throw relay 1532 need to be respectively switched to another contact not connected currently, so as to adjust the reverse connection state of the first phase line 131 and the neutral line 140. The above switching process may be controlled by the controller 120 or manually.

It can be understood that, in the embodiment of the present invention, the phase line and neutral line adjusting module adjusts the connection state or the phase-missing state of each phase of the PLC module, so as to improve the efficiency of the connection adjustment.

As shown in fig. 16, the power input control device 100 further includes a DCU interface module 170, and the DCU interface module 170 includes a first phase input 171, a second phase input 172, a third phase input 173, and a neutral input 174, and F1, F2, and F3 represent fuses.

A first power input of the phase and neutral adjustment module 150 is electrically connected to the first phase line 131, wherein the first power input of the phase and neutral adjustment module 150 includes a pole of a first single pole, double throw relay 1511. A second power input of the phase and neutral adjustment module 150 is electrically connected to the second phase 132, wherein the second power input of the phase and neutral adjustment module 150 includes a pole of a second single pole, double throw relay 1512. That is, the pole of the first single-pole double-throw relay 1511 is electrically connected to the first phase line 131, and the pole of the second single-pole double-throw relay 1512 is electrically connected to the second phase line 132.

The third power input of the phase and neutral trim module 150 is electrically connected to the third phase line 133 and the fourth power input of the phase and neutral trim module 150 is electrically connected to the neutral line 140. Two cases are included: in the first case, if the third power input of the phase and neutral adjustment module 150 includes the pole of the third single-pole double-throw relay 1521, the fourth power input of the phase and neutral adjustment module 150 includes the poles of the fourth single-pole double-throw relay 1531 to the seventh single-pole double-throw relay 1534, that is, if the pole of the first single-pole double-throw relay 1511 is electrically connected to the third phase line 133, the poles of the fourth single-pole double-throw relay 1531 to the seventh single-pole double-throw relay 1534 are electrically connected to the neutral line 140; in the second case, if the third power input of the phase and neutral adjustment module 150 includes the pole of the fourth single-pole double-throw relay 1531 to the pole of the seventh single-pole double-throw relay 1534, the fourth power input of the phase and neutral adjustment module 150 includes the pole of the third single-pole double-throw relay 1521, that is, if the pole of the first single-pole double-throw relay 1511 is electrically connected to the neutral 140, the poles of the fourth single-pole double-throw relay 1531 to the seventh single-pole double-throw relay 1534 are electrically connected to the third phase line 153133.

A first contact of the first single-pole double-throw relay 1511 and a second contact of the fifth single-pole double-throw relay 1532 are electrically connected to the first phase line input end 171 of the DCU interface module 170, a first contact of the second single-pole double-throw relay 1512 and a second contact of the sixth single-pole double-throw relay 1533 are electrically connected to the second phase line input end 172 of the DCU interface module 170, and a first contact of the third single-pole double-throw relay 1521 and a second contact of the seventh single-pole double-throw relay 1534 are electrically connected to the third phase line input end 173 of the DCU interface module 170.

The second contact of the first single-pole double-throw relay 1511, the second contact of the second single-pole double-throw relay 1512, the second contact of the third single-pole double-throw relay 1521, and the first contact of the fourth single-pole double-throw relay 1531 are electrically connected to the neutral line access 174 of the DCU interface module 170, respectively.

The second contact of the fourth single-pole double-throw relay 1531, the first contact of the fifth single-pole double-throw relay 1532, the first contact of the sixth single-pole double-throw relay 1533, and the first contact of the seventh single-pole double-throw relay 1534 are respectively floating.

A control input of the phase and neutral adjustment module 150 is electrically coupled to a first output of the controller 120.

When the controller 120 determines to adjust the wiring state, the controller 120 sends a wiring control instruction to the phase and neutral adjusting module 150, and the phase and neutral adjusting module 150 selects the target single-pole double-throw relay 151 according to the wiring control instruction, and performs closing control on the target single-pole double-throw relay 151 to adjust the wiring state of the phase and neutral.

As shown in fig. 16, if the PLC module 160 is connected to the neutral line 140 in the reverse direction, the poles of the second single-pole double-throw relay 1511, the fourth single-pole double-throw relay 1531, and the sixth single-pole double-throw relay 1533 need to be switched to another contact not connected to the current state, so as to adjust the reverse connection state of the second phase line 132 to the neutral line 140. The action sequence of the relay is as follows: the pole of the fourth single-pole double-throw relay 1531 is switched to the other contact not connected currently, so that the original N phase (actually, B phase) is disconnected; the pole of the second single-pole double-throw relay 1511 is switched to another contact not connected with the current, so that the original B phase (actually, N phase) is switched to the N input channel; the pole of the sixth single-pole double-throw relay 1533 is switched to the other contact not connected currently, so that the original N phase (actually, the B phase) is switched to the B input channel; other relays are kept in the original state, and a certain delay time can be set between each switching.

Similarly, if the first phase line 131 and the neutral line 140 are connected in reverse, the poles of the first single-pole double-throw relay 1511, the fourth single-pole double-throw relay 1531, and the fifth single-pole double-throw relay 1532 need to be respectively switched to another contact not connected currently, so as to adjust the reverse connection state of the first phase line 131 and the neutral line 140. The above switching process may be controlled by the controller 120 or manually.

It can be understood that, in the embodiments of the present invention, the phase line and neutral line adjusting module adjusts the connection state or the phase-missing state of each phase of the DCU interface module, so as to improve the efficiency of the connection adjustment.

In this embodiment, the connection between the modules and the circuits included in the modules may be direct connection, or may be indirect electrical connection through some interfaces, devices, modules, components or circuits.

In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A power input control device is characterized by comprising a phase line and neutral line detection module, a controller, a first phase line, a second phase line, a third phase line and a neutral line;

the input ends of the phase line and neutral line detection module are electrically connected with the first phase line, the second phase line, the third phase line and the neutral line in a one-to-one manner;

the input ends of the controller are respectively and electrically connected with the output ends of the phase line and neutral line detection modules in a one-to-one manner;

the phase line and neutral line detection module outputs the detected wiring parameters of the phase line and the neutral line to the controller, and the controller analyzes and outputs the wiring state according to the wiring parameters;

the phase line and neutral line detection module comprises a first sub-detection module, a second sub-detection module and a third sub-detection module, wherein the first input end of the first sub-detection module is electrically connected to the first phase line, the first input end of the second sub-detection module is electrically connected to the second phase line, and the first input end of the third sub-detection module is electrically connected to the third phase line;

the second input end of the first sub-detection module, the second input end of the second sub-detection module and the second input end of the third sub-detection module are respectively and electrically connected to the neutral line;

the output end of the first sub-detection module is electrically connected with the first input end of the controller, the output end of the second sub-detection module is electrically connected with the second input end of the controller, the output end of the third sub-detection module is electrically connected with the third input end of the controller,

the first sub-detection module, the second sub-detection module and the third sub-detection module respectively comprise a first voltage comparator and a first transistor which are connected in parallel, the first voltage comparator and the first transistor simultaneously receive the voltage of each phase line after voltage transformation and rectification, the first voltage comparator compares the voltage of the phase line with a reference voltage and outputs a corresponding logic level signal according to a comparison result, and meanwhile, the first transistor directly outputs a logic level according to the voltage of the phase line;

the first sub-detection module, the second sub-detection module and the third sub-detection module output three pairs of corresponding logic level signals according to the voltages of the first phase line, the second phase line, the third phase line and the neutral line, the three pairs of logic level signals directly represent the phase connection states of the first phase line, the second phase line, the third phase line and the neutral line, and the controller adjusts the wiring state according to the three pairs of logic level signals.

2. The apparatus of claim 1,

the first sub-detection module comprises a first power frequency transformer and a first rectifier bridge;

the first input end of the first power frequency transformer is electrically connected to the first phase line, and the second input end of the first power frequency transformer is electrically connected to the neutral line;

the first input end of the first rectifier bridge is electrically connected to the first output end of the first power frequency transformer, and the second input end of the first rectifier bridge is electrically connected to the second output end of the first power frequency transformer;

a first input end of the first voltage comparator is electrically connected to a first output end of the first rectifier bridge, and a second input end of the first voltage comparator is electrically connected to a second output end of the first rectifier bridge;

the output end of the first voltage comparator is electrically connected with the first input end of the controller;

the first power frequency transformer outputs the alternating current power supply of the first phase line and the neutral line after voltage conversion to the first rectifier bridge, the first rectifier bridge outputs the direct current power supply obtained after direct current conversion of the alternating current power supply to the first voltage comparator, the first voltage comparator obtains a logic level according to the direct current power supply and outputs the logic level to the controller, and the controller analyzes and outputs a wiring state according to the logic level.

3. The apparatus of claim 2, wherein the first transistor is electrically connected to the first output of the first rectifier bridge;

the first rectifier bridge outputs direct current power to the first transistor, and the first transistor monitors conduction parameters of the first phase line and the neutral line according to the direct current power and outputs the conduction parameters to the controller; the conduction parameter is a wiring parameter of the first phase line and the first neutral line.

4. The apparatus according to any one of claims 1-3, further comprising phase and neutral conditioning modules;

the first power input end of the phase line and neutral line adjusting module is electrically connected with the first phase line;

the second power input end of the phase line and neutral line adjusting module is electrically connected with the second phase line;

the third power input end of the phase line and neutral line adjusting module is electrically connected with the third phase line;

the fourth power input end of the phase line and neutral line adjusting module is electrically connected with the neutral line;

the control input end of the phase line and neutral line adjusting module is electrically connected with the first output end of the controller;

and if the controller analyzes that the wiring state is an abnormal state, the controller sends a wiring control instruction to the phase line and neutral line adjusting module, and the phase line and neutral line adjusting module adjusts the wiring state according to the wiring control instruction.

5. The apparatus of claim 4 wherein the phase and neutral trim modules include a first sub-trim module, a second sub-trim module, and a third sub-trim module;

the first sub-adjusting module comprises a first single-pole double-throw relay and a second single-pole double-throw relay;

the second sub-regulation module comprises a third single-pole double-throw relay;

the third sub-adjusting module comprises a fourth single-pole double-throw relay, a fifth single-pole double-throw relay, a sixth single-pole double-throw relay and a seventh single-pole double-throw relay;

when the controller determines to adjust the wiring state, the controller sends a wiring control instruction to the phase line and neutral line adjusting module, and the phase line and neutral line adjusting module selects a target single-pole double-throw relay from the first single-pole double-throw relay to the seventh single-pole double-throw relay according to the wiring control instruction and performs closing control on the target single-pole double-throw relay to adjust the wiring state of the phase line and the neutral line.

6. The apparatus of claim 5, further comprising a power line carrier unit (PLC) module comprising a first phase input, a second phase input, a third phase input, and a neutral input;

a first power input end of the phase and neutral line adjusting module comprises a pole of the first single-pole double-throw relay; a second power input end of the phase and neutral line adjusting module comprises a pole of the second single-pole double-throw relay;

if the third power input end of the phase and neutral adjustment module comprises the pole of the third single-pole double-throw relay, the fourth power input end of the phase and neutral adjustment module comprises the poles of the fourth single-pole double-throw relay to the seventh single-pole double-throw relay;

if the third power input end of the phase and neutral line adjusting module comprises the pole of the fourth single-pole double-throw relay to the pole of the seventh single-pole double-throw relay, the fourth power input end of the phase and neutral line adjusting module comprises the pole of the third single-pole double-throw relay;

a first contact of the first single-pole double-throw relay and a second contact of the fifth single-pole double-throw relay are respectively and electrically connected to a first phase line input end of the PLC module, a first contact of the second single-pole double-throw relay and a second contact of the sixth single-pole double-throw relay are respectively and electrically connected to a second phase line input end of the PLC module, and a first contact of the third single-pole double-throw relay and a second contact of the seventh single-pole double-throw relay are respectively and electrically connected to a third phase line input end of the PLC module;

the second contact of the first single-pole double-throw relay, the second contact of the second single-pole double-throw relay, the second contact of the third single-pole double-throw relay and the first contact of the fourth single-pole double-throw relay are respectively and electrically connected to the neutral line access end of the PLC module;

the second contact of the fourth single-pole double-throw relay, the first contact of the fifth single-pole double-throw relay, the first contact of the sixth single-pole double-throw relay and the first contact of the seventh single-pole double-throw relay are respectively suspended.

7. The apparatus of claim 5, further comprising a Data Concentration Unit (DCU) interface module comprising a first phase input, a second phase input, a third phase input, and a neutral input;

a first power input end of the phase and neutral line adjusting module comprises a pole of the first single-pole double-throw relay; a second power input end of the phase and neutral line adjusting module comprises a pole of the second single-pole double-throw relay;

if the third power input end of the phase and neutral adjustment module comprises the pole of the third single-pole double-throw relay, the fourth power input end of the phase and neutral adjustment module comprises the poles of the fourth single-pole double-throw relay to the seventh single-pole double-throw relay;

if the third power input end of the phase and neutral line adjusting module comprises the pole of the fourth single-pole double-throw relay to the pole of the seventh single-pole double-throw relay, the fourth power input end of the phase and neutral line adjusting module comprises the pole of the third single-pole double-throw relay;

a first contact of the first single-pole double-throw relay and a second contact of the fifth single-pole double-throw relay are respectively and electrically connected to a first phase line input end of the DCU interface module, a first contact of the second single-pole double-throw relay and a second contact of the sixth single-pole double-throw relay are respectively and electrically connected to a second phase line input end of the DCU interface module, and a first contact of the third single-pole double-throw relay and a second contact of the seventh single-pole double-throw relay are respectively and electrically connected to a third phase line input end of the DCU interface module;

the second contact of the first single-pole double-throw relay, the second contact of the second single-pole double-throw relay, the second contact of the third single-pole double-throw relay and the first contact of the fourth single-pole double-throw relay are respectively and electrically connected to the neutral line access end of the DCU interface module;

the second contact of the fourth single-pole double-throw relay, the first contact of the fifth single-pole double-throw relay, the first contact of the sixth single-pole double-throw relay and the first contact of the seventh single-pole double-throw relay are respectively suspended.

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