CN109347041B - Interline lossless three-phase current divider and design and control method - Google Patents

Interline lossless three-phase current divider and design and control method Download PDF

Info

Publication number
CN109347041B
CN109347041B CN201811488302.2A CN201811488302A CN109347041B CN 109347041 B CN109347041 B CN 109347041B CN 201811488302 A CN201811488302 A CN 201811488302A CN 109347041 B CN109347041 B CN 109347041B
Authority
CN
China
Prior art keywords
shunt
phase
voltage
short
circuit connection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201811488302.2A
Other languages
Chinese (zh)
Other versions
CN109347041A (en
Inventor
莫思特
李碧雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan University
Original Assignee
Sichuan University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan University filed Critical Sichuan University
Priority to CN201811488302.2A priority Critical patent/CN109347041B/en
Publication of CN109347041A publication Critical patent/CN109347041A/en
Application granted granted Critical
Publication of CN109347041B publication Critical patent/CN109347041B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00Overhead installations of electric lines or cables
    • H02G7/16Devices for removing snow or ice from lines or cables
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00Fixed transformers not covered by group H01F19/00
    • H01F30/02Auto-transformers

Abstract

A three-phase line-to-line lossless shunt and a design and control method thereof. The three-phase current divider is arranged on a self-control heat conducting wire between a sending end power supply and a receiving end load. The three-phase shunt has three-phase input and three-phase output, and the three-phase shunt comprises three single-phase reposition of redundant personnel module, and single-phase reposition of redundant personnel module has 7 interfaces to the outside. The single-phase shunt consists of an on-load tap-changer, a shunt transformer, a voltage-dividing transformer, a control motor, a first change-over switch, a second change-over switch and a temperature sensing unit. The three-phase current divider has two structures of a triangular three-phase current divider and a star three-phase current divider. The method can accurately control the current of the inner conductor, and the current of the inner conductor just meets the requirements of ice prevention and ice melting by calculating the turn ratio of the transformer coil, so that the ice prevention and ice melting are accurately controlled. The three-phase shunt works in a normal power transmission mode when ice prevention and melting are not needed; and when the ice-preventing and ice-melting are needed, the device works in an ice-preventing and ice-melting mode. The operation is simple and reliable.

Description

Interline lossless three-phase current divider and design and control method
(I) technical field
The invention relates to an anti-icing and de-icing technology for an electric power transmission line, in particular to an interline lossless three-phase shunt and a design and control method thereof.
(II) background of the invention
With the development of social economy, the requirements for exposed power lines are higher and higher in the environment of increasing the application of power loads. In cold winter, the lines in many areas are frozen, and the lines are damaged. When the icing exceeds the bearing capacity of the line, serious accidents such as line breakage and the like can occur. Therefore, deicing of power transmission lines in winter is indispensable and very important. In the prior art, ice melting technology is continuously improving.
The application number of CN201810370549.8 self-made heat conductor and heating equipment embedded with insulating heat conduction materials and an implementation method thereof fully utilize heating equipment at a power transmission end and heating equipment at a power receiving end. And the power transmission end heating equipment adds alternating current or direct current between the outer conductor and the inner conductor of the self-made heat conductor through an output power supply of the anti-icing and de-icing power transmission device to realize anti-icing and de-icing, and the power receiving end heating equipment is connected with a load through a power receiving end steel core to realize anti-icing and de-icing work.
The heating control detection equipment and the monitoring control method of the multi-strand insulated self-heating wire with the application number of 201811195033.0 can accurately control the current flowing through the internal heating structure and the outer conductor, control the voltage difference of the heating structure, reduce the insulation requirement of the insulating layer and automatically measure whether the self-heating wire is normal.
In the above two technical solutions, the invention of application No. CN201810370549.8 can control the heat generation of the lead by controlling the current of the inner conductor and the outer conductor. However, no current precise control method is given. The invention of application No. 201811195033.0 discloses a method for controlling the current of an inner conductor by using a shunt, but the designed shunt consumes a large amount of energy.
Disclosure of the invention
The invention provides a shunt with low energy consumption, a design method and a control method, which can accurately control the current of an inner conductor, so that the current of the inner conductor just meets the requirements of ice prevention and ice melting. The shunt is mainly installed between two wires of a three-phase power transmission line, and current is accurately controlled, so that accurate control of ice prevention and ice melting is realized. The invention discloses a three-phase shunt which is a nondestructive line-to-line three-phase shunt, which is called a three-phase shunt for short.
The technical scheme of the invention is as follows: a three-phase shunt without line damage is characterized in that a transmission lead of a transmission line adopts a self-made heat conducting wire of a coaxial cable structure. The interline lossless three-phase shunt is arranged between self-control hot wires between a sending end power supply and a receiving end load, the self-control hot wires are divided into a plurality of sections, and the self-control hot wires between the three-phase shunt and the adjacent three-phase shunt at one end of the sending end power supply are called as the last section of self-control hot wires; the self-heating wire between the three-phase current divider and the adjacent three-phase current divider at the end of the load at the receiving end is called as the next section of self-heating wire.
The three-phase shunt is provided with a three-phase input end and a three-phase output end which are respectively an A-phase input end, a B-phase input end and a C-phase input end; an A-phase output end, a B-phase output end and a C-phase output end.
For the A-phase power transmission line, the outer conductors of the adjacent sections of the self-made heat conductors are in short circuit connection, the inner conductor and the outer conductor of each section of the self-made heat conductor, which are close to one end of the sending-end power supply, are in short circuit connection, and the inner conductor, which is close to one end of the receiving-end load, is in short circuit connection with the A-phase input end of the three-phase; the phase A output end of the three-phase shunt is in short-circuit connection with the inner conductor and the outer conductor of the next section of self-made heat conducting wire at the end close to the sending end power supply; the connection method of the B-phase power transmission line and the C-phase power transmission line is similar to that of the A-phase power transmission line.
The interline lossless three-phase shunt consists of three single-phase shunt modules and a processor, wherein the single-phase shunt modules are externally provided with 7 interfaces which are respectively a single-phase input end, a single-phase output end, a single-phase neutral end, a temperature communication interface, an input switching control interface, a motor control interface and an output switching control interface; the single-phase shunt module consists of a single-phase shunt and a microprocessor; the single-phase shunt consists of an on-load tap-changer, a shunt transformer, a voltage-dividing transformer, a control motor, a first change-over switch, a second change-over switch and a temperature sensing unit.
The three-phase shunt has two structures, namely a triangular three-phase shunt and a star three-phase shunt, according to different connection modes of single-phase neutral points, and three single-phase shunt modules are respectively an A-phase shunt module, a B-phase shunt module and a C-phase shunt module; the temperature communication interface, the input switching control interface, the motor control interface and the output switching control interface of the three single-phase shunt modules are all connected with the microprocessor. The first change-over switch of the single-phase shunt module is connected to the microprocessor through the input switching control interface, and the second change-over switch is connected to the microprocessor through the output switching control interface.
The shunt transformer is provided with three external connecting terminals, a shunt low-voltage head end, a shunt high-voltage head end voltage-regulating shunt contact and a shunt transformer neutral point; the head end of the shunt low voltage is in short circuit connection with the ice melting connecting terminal of the first switch; the shunting high-voltage head end tap contact points of the shunting high-voltage head end voltage-regulating tapping contact are in one-to-one short-circuit connection with tapping selection contacts of the on-load tapping switch; the neutral point of the shunt transformer is in short-circuit connection with the head end of the partial voltage low voltage of the partial voltage transformer.
The voltage-dividing transformer is externally provided with two connecting ends: a partial pressure low pressure head end, a partial pressure high pressure head end; the head end of the partial pressure low voltage is in short-circuit connection with a shunt neutral point of the shunt transformer, and the head end of the partial pressure high voltage is in short-circuit connection with an ice melting connecting terminal of the second change-over switch.
The temperature sensing unit measures the temperature of the self-heating wire and transmits the temperature to the microprocessor through the temperature communication interface.
The first change-over switch and the second change-over switch are connected with the microprocessor and are respectively connected with the microprocessor through the input change-over control interface and the output change-over control interface, and the normal power transmission mode or the anti-icing and de-icing mode is selected under the control of the microprocessor. Under a normal power transmission mode, the lead connecting ports of the first change-over switch and the second change-over switch are in short-circuit connection with the short-circuit connecting port; and under the anti-icing and de-icing mode, the wire connecting ports of the first and second transfer switches are in short-circuit connection with the de-icing connecting port.
The single-phase input end of the A-phase shunt module of the triangular three-phase shunt is in short-circuit connection with the A-phase input end, and the single-phase output end of the A-phase shunt module is in short-circuit connection with the A-phase output end; the single-phase input end of the B-phase shunting module is in short-circuit connection with the B-phase input end, and the single-phase output end of the B-phase shunting module is in short-circuit connection with the B-phase output end; the single-phase input end of the C-phase shunting module is in short-circuit connection with the C-phase input end, and the single-phase output end of the C-phase shunting module is in short-circuit connection with the C-phase output end; the single-phase neutral end of the A-phase shunt module is in short-circuit connection with the B-phase output end; the single-phase neutral end of the phase B shunt module is in short-circuit connection with the phase C output end; and the single-phase neutral end of the C-phase shunt module is in short-circuit connection with the A-phase output end.
The single-phase input end of the A-phase shunt module of the star-type three-phase shunt is in short-circuit connection with the A-phase input end, and the single-phase output end of the A-phase shunt module is in short-circuit connection with the A-phase output end; the single-phase input end of the B-phase shunting module is in short-circuit connection with the B-phase input end, and the single-phase output end of the B-phase shunting module is in short-circuit connection with the B-phase output end; the single-phase input end of the C-phase shunting module is in short-circuit connection with the C-phase input end, and the single-phase output end of the C-phase shunting module) is in short-circuit connection with the C-phase output end;
the single-phase neutral end of the A-phase shunt module, the single-phase neutral end of the B-phase shunt module and the single-phase neutral end of the C-phase shunt module are in short-circuit connection, and the short-circuit connection point is called a star-type neutral point; the star point is grounded either not or directly or via a resistor or via a crowbar coil.
The single-phase input end of the single-phase shunt module is in short-circuit connection with the inner conductor at one end, close to the electric load, of the last section of self-made heat conducting wire and is in short-circuit connection with the conducting wire connecting port 39 of the first change-over switch; the wire connecting port of the first change-over switch is in short-circuit connection with the single-phase input end; the short-circuit connection port is in short-circuit connection with the short-circuit connection port of the second change-over switch; the ice melting connection port is in short-circuit connection with the shunt low-voltage head end of the shunt transformer; the single-phase output end is in short-circuit connection with the inner conductor and the outer conductor at one end, close to the power transmission power supply, of the next section of self-made heat conducting wire and is in short-circuit connection with the wire connecting port of the second change-over switch. A second change-over switch) is in short-circuit connection with the short-circuit connection port of the first change-over switch, the short-circuit connection port is in short-circuit connection with the short-circuit connection port of the first change-over switch, and the ice melting connection port is in short-circuit connection with the voltage dividing high-voltage head end and the on-load tap-changer output terminal.
The on-load tap-changer has two connection terminals: the on-load tap-changer comprises an output terminal of the on-load tap-changer and a tap-changing selection contact of the on-load tap-changer; and the output terminal of the on-load tap-changer is connected with the ice melting connecting end of the second change-over switch, and the tapping selection contact of the on-load tap-changer is in one-to-one short-circuit connection with the tapping contact of the shunting high-voltage head end.
The change-over switch is characterized in that a rotation connecting rod is connected to a change-over control motor, the change-over control motor rotates the rotation connecting rod, and a short circuit electric brush is fixed at one end of the rotation connecting rod and is in short circuit connection with a wire connecting port. The change-over switch is externally provided with three connecting terminals which are respectively a wire connecting port, a short-circuit connecting port and an ice melting connecting port.
When the device is used, the wire connecting port is in short-circuit connection with the single-phase input end or the single-phase output end, the ice melting connecting port is in short-circuit connection with the output terminal of the on-load tap-changer, or is in short-circuit connection with the head end of the shunt low-voltage switch, and the short-circuit connecting ports of the two change-over switches are in short-circuit connection; the switching control motor is a stepping motor and rotates at any angle under the control of the microprocessor, so that the rotating connecting rod rotates at any angle;
when the rotating connecting rod rotates to different angles in the clockwise direction, the short circuit mode of the short circuit electric brush is completed once:
1) the short circuit electric brush is short-circuited with the short circuit connecting contact;
2) the short circuit electric brush is simultaneously short-circuited with the short circuit connecting contact and the short circuit connecting resistance contact;
3) the short circuit electric brush is simultaneously short-circuited with the short circuit connecting resistance contact and the ice melting connecting resistance contact;
4) the short circuit electric brush is simultaneously short-circuited with the ice melting connecting resistance contact and the ice melting connecting contact;
5) the short circuit electric brush is short-circuited with the ice melting connecting contact;
when the switching control motor rotates clockwise, the control lead connecting port is switched to be in short-circuit connection with the ice melting connecting contact from a short-circuit connection mode with the short-circuit connecting contact; when the switching control motor rotates anticlockwise, the control lead connecting port is switched to be in short-circuit connection with the short-circuit connecting contact from a short-circuit connection mode with the ice melting connecting resistance contact.
The short-circuit connection contact is short-circuited to the short-circuit connection port.
One end of the short circuit connecting resistor is connected with the short circuit connecting resistor contact, and the other end of the short circuit connecting resistor is connected with the short circuit connecting port.
The ice melting connection contact is short-circuited to the ice melting connection port.
One end of the ice melting connecting resistor is connected with the ice melting connecting contact in a short circuit mode, and the other end of the ice melting connecting resistor is connected with the ice melting connecting port.
The shunt transformer adopts a step-up transformer, and is divided into a double-winding shunt transformer and an auto-shunt transformer according to different structures, the shunt transformer iron core conforms to the national standard of a three-phase transformer, and shunt transformers of three single-phase shunt modules form a three-phase transformer and share one three-phase transformer iron core.
The double-winding shunt transformer is a transformer structure with two windings, which are respectively called a shunt low-voltage winding and a shunt high-voltage winding, and the head ends of the shunt low-voltage winding and the shunt high-voltage winding are homonymous ends. The number of turns of the shunting low-voltage winding coil is less than the number of turns of the coil between the shunting high-voltage head-end tapping contact and the shunting neutral point. The shunting high-voltage head end voltage-regulating shunting contact head is composed of a plurality of shunting high-voltage head end shunting contacts and is connected to the head end of the shunting high-voltage winding. Different coil turns are formed by the shunting high-voltage head end contact point and the shunting high-voltage winding tail end, wherein the coil turns between the first shunting high-voltage head end contact point and the shunting high-voltage winding tail end are the least; the number of coil turns between the second shunt high-voltage head end contact point and the shunt high-voltage winding tail end, the number of coil turns between the third shunt high-voltage head end contact point and the shunt high-voltage winding tail end, … …, the number of coil turns between the tail shunt high-voltage head end contact point and the shunt high-voltage winding tail end are sequentially increased, and the number of coil turns between the tail shunt high-voltage head end contact point and the shunt high-voltage winding tail end is the largest; the tail end of the shunt high-voltage winding is the tail end of the shunt high-voltage winding.
The shunting high-voltage head end contact points are in one-to-one short-circuit connection with the on-load tap-changer shunting selection contacts.
The head end of the shunt low voltage is the head end of the shunt low voltage winding; the tail end of the shunt low-voltage winding is the tail end of the shunt low-voltage winding; the tail end of the shunt low-voltage winding is in short-circuit connection with the tail end of the shunt high-voltage winding to form a shunt neutral point.
The auto-coupling shunt transformer adopts an auto-coupling boosting transformer structure, and only one transformer winding is called as an auto-coupling shunt winding; the head end of the shunt low voltage is led out from the middle tap of the auto-coupling shunt winding, and the shunt neutral point is the tail end of the auto-coupling shunt winding; the shunting high-voltage head end voltage-regulating shunting contact head is composed of a plurality of shunting high-voltage head end shunting contacts. The tail shunt high-voltage head end tapping contact (22-n) is the head end of the self-coupling shunt winding.
The number of turns of the coil between the shunting low-voltage head end and the shunting neutral point is smaller than the number of turns of the coil between the voltage-regulating tapping contact of all shunting high-voltage head ends and the shunting neutral point.
Different coil turns are formed by the shunting high-voltage head end shunting contact point and the shunting low-voltage winding tail end, wherein the number of the coil turns of the first shunting high-voltage head end shunting contact point and the shunting neutral point is the minimum; the number of turns of the coil of the second shunt high-voltage head end tapping contact and the shunt neutral point, the number of turns of the coil of the third shunt high-voltage head end tapping contact and the shunt neutral point, … …, the number of turns of the coil of the tail shunt high-voltage head end tapping contact and the shunt neutral point are sequentially increased, and the number of turns of the coil of the tail shunt high-voltage head end tapping contact and the shunt neutral point is the largest.
The voltage division transformer adopts a step-up transformer and is divided into the following parts according to different structures: a double winding voltage-dividing transformer, an autotransformer; the voltage dividing transformers of the three single-phase shunt modules form a three-phase transformer, and share a three-phase transformer iron core.
The double-winding voltage-dividing transformer consists of two windings, namely a voltage-dividing low-voltage winding and a voltage-dividing high-voltage winding; the number of turns of the coil of the voltage division low-voltage winding is less than that of the turns of the coil of the voltage division high-voltage winding.
The head end of the partial pressure low pressure and the head end of the partial pressure high pressure are homonymous terminals; and after the voltage-dividing low-voltage tail end and the voltage-dividing high-voltage tail end are in short-circuit connection, the voltage-dividing low-voltage tail end and the voltage-dividing high-voltage tail end are in short-circuit connection with the ground to form a single-phase neutral end.
Turn ratio K of double-winding voltage-dividing transformersv
The voltage-dividing autotransformer is provided with only one winding and is called as a voltage-dividing autotransformer; the head end of the voltage division high voltage is connected with the head end of the self-coupling voltage division winding, and the tail end of the self-coupling voltage division winding forms a single-phase neutral end. The head end of the partial voltage low voltage is extracted from the self-coupling partial voltage winding; the number of turns of the coil between the head end of the partial pressure low voltage and the tail end of the self-coupling partial pressure winding is smaller than the number of turns of the coil between the head end of the partial pressure high voltage and the tail end of the self-coupling partial pressure winding; the head end of the partial pressure high pressure and the head end of the partial pressure low pressure are homonymous ends;
turn ratio K of autotransformerzv
The parameters of the shunt were calculated as:
setting the voltage at the output end of the shunt to VoutThe head end voltage of the divided low voltage is Vds(ii) a The turn ratio of the voltage-dividing transformer is as follows:
and (3) designing the tapping turn ratio of a tapping contact at the head end of the shunt high voltage: the calculation of the number of turns of the coil between the contact point of the shunt high-voltage head end and each shunt neutral point is the key of shunt design; determining the turn ratio of the coil, firstly determining the current of an inner conductor of the self-made hot wire:
inner conductor current calculation: setting the diameter of the inner conductor of the self-made heat conducting wire as DnDiameter of insulating material DjThe diameter of the outer conductor of the self-made heat conductor is Dw(ii) a Resistivity of the inner conductor is rhonThen, the reference current I of the self-made thermal conductor for preventing ice and melting ice0Comprises the following steps:
Figure BDA0001895081590000062
the minimum current flowing through the inner conductor is k of the reference current through the control of the on-load tap-changerminMultiple, kmin<1, k is maximum of reference currentmaxMultiple, kmax>1; the inner conductor is passed a minimum current IminComprises the following steps:
Imin=kminI0
the inner conductor passes the maximum current ImaxComprises the following steps:
Imax=kmaxI0
by control of on-load tap-changers, the current I of the inner conductorn(i) The values that can be controlled are given by the following formula, where i is 1,2,3, … …, n:
and (3) calculating the turn ratio:
setting the length of the self-control heat wire between the calculated current divider and the last current divider between the current divider and the sending end power supply as L, if no current divider Is arranged between the current divider and the sending end power supply, the length of the self-control heat wire between the current divider and the power supply as L, the resistivity of the outer conductor as rho w, the transmission current of the self-control heat wire as Is, the number of turns of the coil between the low-voltage head end of the current divider and the neutral point of the current divider as N1,
the internal conductor resistance Rn is such that,
resistance R of outer conductorwComprises the following steps:
the number of turns of a coil between the shunting high-voltage head end tapping contact and the shunting neutral point is N (i), i is 1,2,3, …, n:
n (1) represents the number of turns of a coil between the first shunt high-voltage head end tapping contact 22-1 and a shunt neutral point;
n (2) represents the number of turns of a coil between the second shunt high-voltage head end tapping contact 22-2 and a shunt neutral point;
……
n (n) represents the number of turns of a coil between a tail shunt high-voltage head end tapping contact and a shunt neutral point;
the current flowing through the conductor in the self-made hot wire can be controlled by controlling and shunting the low-high head end tapping contact. When the first shunt high-voltage head-end tap contact point is in short-circuit connection with the output terminal of the on-load tap-changer, the current flowing through the inner conductor is minimum, the second shunt high-voltage head-end tap contact point is in short-circuit connection with the output terminal of the on-load tap-changer, the third shunt high-voltage head-end tap contact point is in short-circuit connection with the output terminal of the on-load tap-changer, when the last shunt high-voltage head-end tap contact point is in short-circuit connection with the output terminal of the on-load tap-changer, the current flowing through the inner conductor of the self-heating lead is sequentially increased, and when the last shunt high-voltage head-end.
The microprocessor shunt is controlled by controlling the three single-phase shunt modules in turn, and a control program comprises a main flow, a single-phase shunt module control subprogram, a heat preservation control subprogram and an ice melting control subprogram;
the main flow is as follows:
calling a phase A shunt module control subprogram, and entering a second step;
calling a phase B shunt module control subprogram, and entering a third step;
step three, calling a phase C shunt module control subprogram, and entering the step one; wherein:
the control subprogram of the A-phase shunting module refers to a change-over switch, a temperature sensing unit, a change-over switch, a temperature sensing unit and a control motor which are controlled by a microprocessor, wherein the change-over switch, the temperature sensing unit and the control motor are used for controlling the A-phase shunting module, and the control flow is a single-phase shunting module control subprogram;
the control subprogram of the B-phase shunting module refers to a change-over switch, a temperature sensing unit, a change-over switch, a temperature sensing unit and a control motor which are controlled by a microprocessor, wherein the change-over switch, the temperature sensing unit and the control motor are used for controlling the motor to be the B-phase shunting module, and the control flow is a single-phase shunting module control subprogram;
the control subprogram of the C-phase shunting module refers to a change-over switch, a temperature sensing unit, a change-over switch, a temperature sensing unit and a control motor which are controlled by a microprocessor, wherein the change-over switch, the temperature sensing unit and the control motor are used for controlling the motor to be the C-phase shunting module, and the control flow is a single-phase shunting module control subprogram;
the single-phase shunt module control subprogram is as follows:
the first step is to receive a control command and enter the second step;
the second step judges whether to start the anti-icing and de-icing control, and comprises the following steps: the change-over switch is switched to the anti-icing and de-icing mode, and the fourth step is operated; otherwise: operating the third step;
the third step, the change-over switch is switched to a normal power transmission mode, and the tenth step is entered;
step four, judging whether to start heat preservation control, and if so, judging that: entering the fifth step; otherwise: entering the seventh step;
step five, receiving heat preservation control parameters, and entering step six;
sixthly, calling a heat preservation control subprogram, and entering the tenth step;
step seven, judging whether to start ice melting control, comprising the following steps: entering the eighth step; otherwise: entering the tenth step;
eighthly, receiving ice melting control parameters and entering the ninth step;
the ninth step calls the ice-melting control subprogram and enters the tenth step;
step ten, returning to the calling program.
The heat preservation control subprogram is as follows:
setting the maximum control temperature Tmax of an outer conductor; setting the minimum control temperature Tmin of the outer conductor; setting an initial temperature rise time ts; setting temperature adjustment waiting time td; setting the initial position of the tapping contact of the high-voltage head end, and entering the second step;
the output terminal of the on-load tap-changer is connected to the initial position of the tap contact of the head end of the shunt high voltage, and the third step is carried out;
the third step is to wait for ts and enter the fourth step;
step four, receiving the measured temperature value T of the temperature sensing unit, and entering step five;
and a fifth step of judging whether T is greater than Tmax, if yes, entering a sixth step, and if not: entering the eighth step;
sixthly, regulating the current of the inner conductor to be lower by one gear, and entering a seventh step;
step seven, waiting for td, and entering the step ten;
and an eighth step of judging whether T is smaller than Tmin, if yes, entering the ninth step, and if not: entering the tenth step;
step nine, increasing the current of the inner conductor by one gear, and entering the step ten;
step ten, waiting for td, and entering the step ten;
the eleventh step returns to the caller.
The ice-melting control subprogram is as follows:
the method comprises the following steps that firstly, the highest ice melting temperature TRmax of an outer conductor is set; setting the lowest ice melting temperature TRmin of the outer conductor; setting ice melting and temperature rising initial time trs; setting ice melting and temperature adjusting waiting time trd; setting the initial position of the tapping contact of the high-voltage head end, and entering the second step;
the output terminal of the on-load tap-changer is connected to the initial position of the tap contact of the head end of the shunt high voltage, and the third step is carried out;
the third step waits for trs, and the fourth step is started;
step four, receiving the measured temperature value T of the temperature sensing unit, and entering step five;
and a fifth step of judging whether T is larger than TRmax, if yes, entering a sixth step, and if not: entering the eighth step;
sixthly, regulating the current of the inner conductor to be lower by one gear, and entering a seventh step;
the seventh step waits for trd, and the eleventh step is started;
and the eighth step of judging whether T is less than TRmin, if yes, entering the ninth step, and if not: entering the tenth step;
the ninth step is to increase the current of the inner conductor by one gear and the tenth step is carried out
Step ten, waiting for trd, and entering step eleventh
The eleventh step returns to the caller.
The invention has the positive effects that:
1. the invention provides a line-to-line lossless three-phase shunt which is low in energy consumption and good in effect and can accurately control the current of an inner conductor. By calculating the turn ratio of the transformer coil, the current of the inner conductor just meets the requirement of anti-icing and de-icing, the current is accurately controlled, and the anti-icing and de-icing are accurately controlled.
2. The shunt can work in a normal power transmission mode when ice prevention and ice melting are not needed; when the ice-proof and ice-melting are needed, the short-circuit connection point of the short-circuit brush of the change-over switch is changed, so that the shunt works in the ice-proof and ice-melting mode.
3. The current is accurately controlled, the anti-icing and de-icing effects are accurately controlled, the energy is saved, and the popularization and application occasions are wide and practical.
4. The microprocessor automatically controls the shunt, and the operation is simple and reliable.
Description of the drawings
Fig. 1 is a schematic diagram of an external connection interface structure of the interline lossless three-phase shunt of the invention.
Figure 2 is a schematic view of the connection of the interline lossless three-phase shunt of the invention to the power conductor.
Fig. 3 is a single-phase shunt module interface schematic diagram of the interline lossless three-phase shunt of the present invention.
Fig. 4 is a schematic view of a delta type three-phase shunt in the interline lossless three-phase shunt of the present invention.
Fig. 5 is a schematic diagram of a star-type three-phase current divider.
Fig. 6 is a schematic structural diagram of a single-phase shunt module of the interline lossless three-phase shunt.
Fig. 7 is a schematic diagram of the structure of the diverter switch of the line-to-line lossless three-phase shunt of the present invention.
Fig. 8 is a schematic structural diagram of a shunt transformer dual-winding shunt transformer of the present invention.
Fig. 9 is a shunt transformer autotransformer of the present invention.
Fig. 10 is a schematic structural diagram of a voltage-dividing transformer with two windings according to the present invention.
Fig. 11 is a schematic structural diagram of the voltage-dividing transformer self-coupling voltage-dividing transformer of the present invention.
Fig. 12 is a schematic view of the basic structure of the self-made heat conducting wire used in the present invention.
Fig. 13 is a main flow program diagram of the microprocessor controlled flow divider.
Fig. 14 is a diagram of a single phase shunt module control subroutine for a microprocessor controlled shunt.
FIG. 15 is a diagram of a microprocessor controlled shunt keep warm control subroutine.
FIG. 16 is a diagram of a microprocessor controlled shunt ice melt control subroutine
FIG. 17 is a schematic diagram of a microprocessor circuit.
In the figure, a 2A A phase input end, a 2B B phase input end, a 2C C phase input end, a 3A A phase output end, a 3B B phase output end, a 3C C phase output end, a 3 self-made thermal conductor inner conductor, a 4 self-made thermal conductor outer conductor, a 1-1 to 1-n three-phase shunt, a 2A-1 to A phase input end, a 2B-1 to 2B-n B phase input end, a 2C-1 to 2C-n C phase input end, a 3A-1 to 3A-n A phase output end, a 3B-1 to 3B-n B phase output end, a 3C-1 to 3C-n C phase output end, a 4-1 to 4-n self-made thermal conductor outer conductor, a 5-1' 5-n self-made thermal conductor, a 6-1 to 6-n self-made thermal conductor inner conductor, a 7 sending terminal power supply, an 8 receiving terminal load, a 9 on-load tap changer, a 10 on-load tap changer tap selection contact, an 11 shunt low-voltage head end, a 12 shunt transformer, a 13 shunt high-voltage head end voltage regulation tap contact, a 14 shunt transformer neutral point, a 15 shunt low-voltage head end, a 16 shunt transformer, a 17 shunt high-voltage head end, an 18 control motor, a 19 on-load tap changer output terminal, 22-1 to 22-n shunt high-voltage head end tap contacts (n >1), a 23 shunt low-voltage winding, a 24 shunt low-voltage winding tail end, a 26 shunt high-voltage winding tail end, a 27 shunt high-voltage winding, a 28 auto-shunt winding, a 29 wire connection port, a 30 switching control motor, a 31 rotation connection rod, a 32 short circuit brush, a 33 short circuit connection contact, a 34 short circuit connection resistance contact, a 35 ice melting connection, the ice-melting device comprises a 38 ice-melting connecting resistor, a 39 short-circuit connecting port, a 40 ice-melting connecting port, a 50 voltage-dividing low-voltage winding, a 51 voltage-dividing low-voltage end, a 52 voltage-dividing high-voltage winding, a 53 voltage-dividing high-voltage end, a 54 self-coupling voltage-dividing winding, a 55 temperature sensing unit, a 56-1 first change-over switch, a 56-2 second change-over switch, 60 insulating materials, a 71 single-phase input end, a 72 single-phase output end, a 73 single-phase neutral end, a 74 temperature communication interface, a 75 input change-over control interface, a 76 motor control interface, a 77 output change-over control interface, a 78 microprocessor, a 79A phase current-dividing module, an 80B phase.
Detailed Description
The power transmission line and the transformer adopted by the invention adopt the self-made thermal conductor of a coaxial cable structure, which is the self-made thermal conductor disclosed by Chinese patents CN201810370549.8 and CN201811195033.0 applied by the inventor, and comprises a self-made thermal conductor inner conductor 3, a self-made thermal conductor outer conductor 4 and an insulating material 60.
The homemade heat wire structure is shown in fig. 12.
See figures 1-5, 17.
The three-phase current divider is controlled by a microprocessor, and the microprocessor adopts an integrated circuit TMS320F2812 produced by Texas instruments in America, and the circuit diagram is shown in FIG. 17.
The interline lossless three-phase shunt 1-n is arranged on a self-control heat conducting wire between a sending end power supply and a receiving end load, the self-control heat conducting wire is divided into a plurality of sections, and the self-control heat conducting wire between the three-phase shunt and an adjacent three-phase shunt at one end of the sending end power supply is called as a previous section of self-control heat conducting wire; the self-heating wire between the three-phase current divider and the adjacent three-phase current divider at the end of the load at the receiving end is called as the next section of self-heating wire.
The sending end power supply 7 is three-phase output, the receiving end load 8 is three-phase input, the three-phase shunt is provided with a three-phase input end and a three-phase output end which are respectively an A-phase input end 2A-1-2A-n, a B-phase input end 2B-1-2B-n and a C-phase input end 2C-1-2C-n; the phase A output ends 3A-1-3A-n, the phase B output ends 3B-1-3B-n and the phase C output ends 3C-1-3C-n.
The outer conductors of the adjacent sections of the self-made heat conductors are in short circuit connection, the inner conductor and the outer conductor of each section of the self-made heat conductor, which are close to one end of the sending end power supply, are in short circuit connection, and the inner conductor, which is close to one end of the receiving end load, is in short circuit connection with the phase A input end of the three-phase shunt; the phase A output end of the three-phase shunt is in short-circuit connection with the inner conductor and the outer conductor of the next section of self-made heat conducting wire at the end close to the sending end power supply; the connection method of the B-phase power transmission line and the C-phase power transmission line is similar to that of the A-phase power transmission line.
The interline lossless three-phase shunt consists of three single-phase shunt modules and a microprocessor 78. The single-phase shunt module has 7 interfaces to the outside, which are a single-phase input end 71, a single-phase output end 72, a single-phase neutral end 73, a temperature communication interface 74, an input switching control interface 75, a motor control interface 76, and an output switching control interface 77.
The three-phase shunt has two structures, namely a triangular three-phase shunt and a star three-phase shunt, according to different connection modes of single-phase neutral points, and three single-phase shunt modules are respectively an A-phase shunt module 79, a B-phase shunt module 80 and a C-phase shunt module 81; the temperature communication interface 74, the input switching control interface 75, the motor control interface 76 and the output switching control interface 77 of the three single-phase shunt modules are all connected with the microprocessor 78; the first switch 56-1 of the single-phase shunt module is connected to the microprocessor through the input switching control interface 75, and the second switch 56-2 is connected to the microprocessor through the output switching control interface 77.
The single-phase input end 71 of the A-phase shunt module 79 of the triangular three-phase shunt is in short-circuit connection with the A-phase input end 2A, and the single-phase output end 72 of the A-phase shunt module is in short-circuit connection with the A-phase output end 3A; the single-phase input end 71 of the B-phase shunting module is in short-circuit connection with the B-phase input end 2B, and the single-phase output end 72 of the B-phase shunting module is in short-circuit connection with the B-phase output end 3B; the single-phase input end 71 of the C-phase shunting module is in short-circuit connection with the C-phase input end 2C, and the single-phase output end 72 of the C-phase shunting module is in short-circuit connection with the C-phase output end 3C; the single-phase neutral end 73 of the phase A shunt module is in short-circuit connection with the phase B output end 3B; the single-phase neutral end 73 of the phase B shunt module is in short-circuit connection with the phase C output end 3C; the single-phase neutral terminal 73 of the C-phase splitter module is short-circuited with the a-phase output terminal 3A.
The single-phase neutral end of the A-phase shunting module 79, the single-phase neutral end of the B-phase shunting module and the single-phase neutral end of the C-phase shunting module of the star-type three-phase shunt are in short-circuit connection, and the short-circuit connection point is called as a star-type neutral point; the star point is grounded either not or directly or via a resistor or via a crowbar coil. The shunt transformer 12 has three external connection terminals: a shunt low-voltage head end 11, a shunt high-voltage head end voltage-regulating tapping contact 13 and a shunt transformer neutral point 14; the shunting low-voltage head end 11 is in short-circuit connection with the ice melting connection port 40 of the first selector switch 56-1; shunting high-voltage head end tapping contacts 22-1-22-n of the shunting high-voltage head end voltage regulating tapping contact 13 are in one-to-one short-circuit connection with the on-load tapping switch tapping selection contacts 10; the neutral point 14 of the shunt transformer is in short-circuit connection with the head end 15 of the partial voltage transformer.
The voltage-dividing transformer 16 has two external connection ends: a partial pressure low pressure head 15, a partial pressure high pressure head 17; the head end 15 of the partial voltage low voltage is in short-circuit connection with the shunt neutral point 14 of the shunt transformer, and the head end 17 of the partial voltage high voltage is in short-circuit connection with the ice melting connection terminal of the second change-over switch 56-2. The temperature sensing unit 55 measures the homemade hot wire temperature and transmits the temperature to the microprocessor through the temperature communication interface.
The first change-over switch 56-1 and the second change-over switch 56-2 are both connected with the microprocessor 78, are respectively connected with the microprocessor 78 through an input change-over control interface 75 and an output change-over control interface 77, and select a normal power transmission mode or an anti-icing and de-icing mode under the control of the microprocessor; in the normal power transmission mode, the conductor connection ports 29 of the first changeover switch 56-1 and the second changeover switch 56-2 are short-circuited with the short-circuit connection port 39; and under the anti-icing and de-icing mode, the wires of the first and second change-over switches are connected with the ports.
See fig. 6.
The single-phase shunt module consists of a single-phase shunt module and a microprocessor 78; the single-phase current divider is composed of an on-load tap-changer 9, a shunt transformer 12, a voltage-dividing transformer 16, a control motor 18, a first change-over switch 56-1, a second change-over switch 56-2 and a temperature sensing unit 55.
The single-phase input end 71 of the single-phase shunt module is in short-circuit connection with the inner conductor at one end, close to the electric load, of the last section of self-made heat wire and is in short-circuit connection with the wire connecting port 29 of the first change-over switch 56-1; the wire connection port 29 of the first changeover switch 56-1 is short-circuited with the single-phase input terminal 71; the short-circuit connection port 39 is short-circuited with the short-circuit connection port 39 of the second changeover switch 56-2; the ice melting connection port 40 is short-circuited with the shunt low voltage head end 11 of the shunt transformer 12. The single-phase output end 72 is in short-circuit connection with the inner conductor and the outer conductor at one end of the next self-made heat wire close to the power supply, and is in short-circuit connection with the wire connection port of the change-over switch 56-2;
the on-load tap-changer 9 has two connection terminals: an output terminal 19 of the on-load tap-changer and a tap selection contact 10 of the on-load tap-changer; an output terminal 19 of the on-load tap-changer is in short-circuit connection with the ice melting connecting end 40 of the second change-over switch 56-2, and a tapping selection contact 10 of the on-load tap-changer is in short-circuit connection with tapping contacts 22-1-22-n at the head end of the shunting high voltage one by one.
The on-load tap-changer of the embodiment is produced by Guizhou Long-character electric company, Inc.: ZVND on-load tap-changer; the control motor adopts an electric mechanism matched with a ZVND on-load tap-changer produced by Guizhou Changqi electric company Limited. The control motor is connected with the on-load tap-changer and is used for controlling and selecting one of tap-changing contacts at the head end of the on-load tap-changer for tap-changing and selective shunting to be in short circuit connection with an output terminal of the on-load tap-changer. Is connected with the microprocessor through a motor control interface.
See fig. 7.
The change-over switch is characterized in that a rotary connecting rod 31 is connected to a change-over control motor 30, the change-over control motor 30 rotates the rotary connecting rod 31, and a short-circuit electric brush 32 is fixed at one end of the rotary connecting rod and is in short-circuit connection with a lead connecting port; the change-over switch is externally provided with three connecting terminals, namely a lead connecting port 29, a short-circuit connecting port 39 and an ice melting connecting port 40;
when the device is used, the lead connecting port 29 is in short-circuit connection with the single-phase input end 71 or the single-phase output end 72, and the ice melting connecting port 40 is in short-circuit connection with the output terminal of the on-load tap-changer 9 or in short-circuit connection with the head end of the shunt low-voltage; the switching control motor is a stepping motor, and rotates at any angle under the control of the microprocessor 78, so that the rotating connecting rod rotates at any angle;
when the rotating connecting rod rotates to different angles in the clockwise direction, the following short circuit modes of the short circuit electric brush are completed in sequence:
1) the short-circuit brush is short-circuited with the short-circuit connection contact 33;
2) the short-circuit brush is short-circuited simultaneously with the short-circuit connection contact 33 and the short-circuit connection resistance contact 34;
3) the short circuit brush is simultaneously short-circuited with the short circuit connection resistance contact 34 and the ice melting connection resistance contact 35;
4) the short circuit brush is simultaneously short-circuited with the ice melting connecting resistance contact 35 and the ice melting connecting contact 36;
5) the short circuit brush is short-circuited with the ice melting connection contact 36;
when the switching control motor rotates clockwise, the control lead connecting port is switched from the short-circuit connection mode with the short-circuit connecting contact 33 to the short-circuit connection mode with the ice melting connecting contact 36; when the switching control motor rotates in the counterclockwise direction, the control lead connection port is switched from the short-circuit connection with the ice melting connection contact 36 to the short-circuit connection with the short-circuit connection contact 33;
the short-circuit connection contact 33 is short-circuited to the short-circuit connection port 39;
one end of the short-circuit connecting resistor 37 is connected with the short-circuit connecting resistor contact 34, and the other end is connected with the short-circuit connecting port 39; ice melt connection contact 36 is short circuited to ice melt connection port 40;
ice melt connection resistor 38 has one end short circuited to ice melt connection contact 36 and one end connected to ice melt connection port 40.
See figures 8-11.
The shunt transformer 12 is a step-up transformer, and is divided into a double-winding shunt transformer and an auto-shunt transformer according to different structures, wherein the shunt transformer core conforms to the national standard of a three-phase transformer, and shunt transformers of three single-phase shunt modules form a three-phase transformer and share a three-phase transformer core.
The double-winding shunt transformer is a transformer structure with two windings, which are respectively called a shunt low-voltage winding 23 and a shunt high-voltage winding 27, and the head ends of the shunt low-voltage winding 23 and the shunt high-voltage winding 23 are homonymous ends; the number of turns of the coil of the shunt low-voltage winding 23 is less than the number of turns of the coil between all shunt high-voltage head-end tapping contacts 22-1-22-n n and a shunt neutral point. The shunting high-voltage head end voltage-regulating tapping contact 13 consists of a plurality of shunting high-voltage head end tapping contacts 22-1-22-n and is connected to the head end of a shunting high-voltage winding 27; different coil turns are formed by the shunting high-voltage head end tapping contact points 22-1-22-n and the tail end of the shunting high-voltage winding, wherein the number of the coil turns between the first shunting high-voltage head end tapping contact point 22-1 and the tail end of the shunting high-voltage winding is the least; the number of coil turns between the second shunt high voltage head end tap contact 22-2 and the shunt high voltage winding tail end, the number of coil turns between the third shunt high voltage head end tap contact 22-3 and the shunt high voltage winding tail end, … …, the number of coil turns between the tail shunt high voltage head end tap contact 22-n and the shunt high voltage winding tail end are sequentially increased, and the number of coil turns between the tail shunt high voltage head end tap contact 22-n and the shunt high voltage winding tail end is the largest; the tail end of the shunt high-voltage winding is the tail end of the shunt high-voltage winding;
shunting high-voltage head end tapping contacts 22-1-22-n are in one-to-one short-circuit connection with on-load tap-changer tapping selection contacts.
The head end 11 of the shunt low voltage is the head end of the shunt low voltage winding; the shunt low-voltage winding end 24 is the end of the shunt low-voltage winding; shunt low voltage winding end 24 is short circuited with shunt high voltage winding end 26 to form a shunt neutral.
The auto-coupling shunt transformer adopts an auto-coupling boosting transformer structure, and only one transformer winding is called as an auto-coupling shunt winding; the head end of the shunt low voltage is led out from the middle tap of the auto-coupling shunt winding, and the shunt neutral point is the tail end of the auto-coupling shunt winding; the shunt high-voltage head end voltage-regulating shunt contact head is composed of a plurality of shunt high-voltage head end shunt contacts, and the tail shunt high-voltage head end shunt contact (22-n) is the head end of the self-coupling shunt winding; .
The number of turns of the coil between the shunt low-voltage head end and the shunt neutral point is less than the number of turns of the coil between all the shunt high-voltage head end voltage-regulating tapping contacts 22-n and the shunt neutral point.
Different coil turns are formed by shunting high-voltage head end tapping contacts (22-1-22-n) and shunting low-voltage winding tail ends, wherein the number of the coil turns of the first shunting high-voltage head end tapping contact 22-1 and a shunting neutral point is the least; the number of turns of the coil of the second shunt high-voltage head-end tapping contact 22-2 and the shunt neutral point, the number of turns of the coil of the third shunt high-voltage head-end tapping contact 22-3 and the shunt neutral point, … …, and the number of turns of the coil of the tail shunt high-voltage head-end tapping contact 22-n and the shunt neutral point are sequentially increased, and the number of turns of the coil of the tail shunt high-voltage head-end tapping contact 22-n and the shunt neutral point is the largest.
The voltage-dividing transformer adopts a step-up transformer and is divided into the following components according to the difference of the structure: a double winding voltage-dividing transformer, an autotransformer; the voltage dividing transformers of the three single-phase shunt modules form a three-phase transformer, and share a three-phase transformer iron core.
The double-winding voltage-dividing transformer consists of two windings, namely a voltage-dividing low-voltage winding 50 and a voltage-dividing high-voltage winding 52; the number of turns of the coil of the voltage division low-voltage winding is less than that of the turns of the coil of the voltage division high-voltage winding.
The head end 15 of the partial pressure low pressure and the head end 17 of the partial pressure high pressure are homonymous terminals; the divided voltage low voltage terminal 51 and the divided voltage high voltage terminal 53 are short-circuited to form a single-phase neutral terminal 73.
Turn ratio Ksv of the double-winding voltage-dividing transformer:
the autotransformer has only one winding, which is called as an autotransformer; the head end 17 of the voltage division high voltage is connected with the head end of the self-coupling voltage division winding, and the tail end of the self-coupling voltage division winding forms a single-phase neutral end 73. The head end 15 of the partial voltage low voltage is extracted from the self-coupling partial voltage winding; the number of turns of the coil between the head end 13 of the partial pressure low voltage and the tail end of the self-coupling partial pressure winding is smaller than the number of turns of the coil between the head end 17 of the partial pressure high voltage and the tail end of the self-coupling partial pressure winding; the head end 17 of the partial pressure high pressure and the head end 13 of the partial pressure low pressure are homonymous terminals;
turns ratio Kzv of autotransformer
The parameters of the shunt were calculated as:
setting the voltage at the output end of the shunt to VoutThe head end voltage of the divided low voltage is Vds(ii) a The turn ratio of the voltage-dividing transformer is as follows:
and (3) designing the tapping turn ratio of a tapping contact at the head end of the shunt high voltage: the calculation of the number of turns of the coil between the contact point of the shunt high-voltage head end and each shunt neutral point is the key of shunt design; determining the turn ratio of the coil, firstly determining the current of an inner conductor of the self-made hot wire:
inner conductor current calculation: setting the diameter of the inner conductor of the self-made heat conducting wire as DnDiameter of insulating material DjThe diameter of the outer conductor of the self-made heat conductor is Dw(ii) a Resistivity of the inner conductor is rhonThen, the reference current I of the self-made thermal conductor for preventing ice and melting ice0Comprises the following steps:
the minimum current flowing through the inner conductor is k of the reference current through the control of the on-load tap-changerminMultiple, kmin<1, k is maximum of reference currentmax times, kmax>1; the inner conductor is passed a minimum current IminComprises the following steps:
Imin=kminI0
the inner conductor flowing the maximum electricityStream ImaxComprises the following steps:
Imax=kmaxI0
by controlling the on-load tap changer, the value of the inner conductor current in (i) can be controlled as follows, where i is 1,2,3, … …, n:
Figure BDA0001895081590000154
and (3) calculating the turn ratio:
setting the self-control thermal lead length between the current divider and the last current divider between the current divider and the sending end power supply to be L, and if no current divider is arranged between the current divider and the sending end power supply, the self-control thermal lead length between the current divider and the power supply is L, and the resistivity of the outer conductor is rhowThe self-made hot wire delivers current IsThe number of turns of the coil between the head end of the shunt low voltage and the shunt neutral point is N1,
inner conductor resistance RnIn order to realize the purpose,
resistance R of outer conductorwIn order to realize the purpose,
the number of turns of a coil between a shunting high-voltage head end tapping contact (22-1-22-n) and a shunting neutral point is
N(i),i=1,2,3,…,n:
N (1) represents the number of turns of a coil between a first shunt high-voltage head end tapping contact (22-1) and a shunt neutral point;
n (2) represents the number of turns of a coil between a second shunt high-voltage head end tapping contact (22-2) and a shunt neutral point;
……
n (n) represents the number of coil turns between the tail shunt high voltage head end tap contact (22-n) and the shunt neutral.
The current flowing through the conductor in the self-made hot wire is controlled by controlling the shunting high-voltage head end tapping contact. When the first shunting high-voltage head-end tapping contact 22-1 is in short-circuit connection with an output terminal of the on-load tap-changer, the current flowing through the inner conductor is the minimum, the second shunting high-voltage head-end tapping contact 22-2 is in short-circuit connection with the output terminal of the on-load tap-changer, the third shunting high-voltage head-end tapping contact 22-3 is in short-circuit connection with the output terminal of the on-load tap-changer … …, when the last shunting high-voltage head-end tapping contact 22-n is in short-circuit connection with the output terminal of the on-load tap-changer, the current flowing through the inner conductor of the self-made heating conductor is sequentially increased, and when the last shunting high-voltage head-end tapping contact 22-.
See figures 12-16.
The microprocessor shunt is controlled by controlling the three single-phase shunt modules in turn, and a control program comprises a main flow, a single-phase shunt module control subprogram, a heat preservation control subprogram and an ice melting control subprogram;
the main flow is as follows: calling a phase A shunt module control subprogram, and entering a second step;
calling a phase B shunt module control subprogram, and entering a third step;
step three, calling a phase C shunt module control subprogram, and entering the step one; wherein:
the control subprogram of the A-phase shunting module refers to a control subprogram of a single-phase shunting module, wherein the microprocessor controls a change-over switch, a temperature sensing unit, a change-over switch for controlling the motor to be the A-phase shunting module, the temperature sensing unit and the control motor;
the control subprogram of the B-phase shunting module refers to a change-over switch, a temperature sensing unit, a change-over switch, a temperature sensing unit and a control motor which are controlled by a microprocessor, wherein the change-over switch, the temperature sensing unit and the control motor are used for controlling the motor to be the B-phase shunting module, and the control flow is a single-phase shunting module control subprogram;
the control subprogram of the C-phase shunting module refers to a change-over switch, a temperature sensing unit, a change-over switch for controlling the motor to be the C-phase shunting module, a temperature sensing unit and a control motor which are controlled by a microprocessor, and the control flow is a single-phase shunting module control subprogram.
The single-phase shunt module control subprogram is as follows:
the first step is to receive a control command and enter the second step;
the second step judges whether to start the anti-icing and de-icing control, and comprises the following steps: the change-over switch is switched to the anti-icing and de-icing mode, and the fourth step is operated; otherwise: operating the third step;
the third step, the change-over switch is switched to a normal power transmission mode, and the tenth step is entered;
step four, judging whether to start heat preservation control, and if so, judging that: entering the fifth step; otherwise: entering the seventh step;
step five, receiving heat preservation control parameters, and entering step six;
sixthly, calling a heat preservation control subprogram, and entering the tenth step;
step seven, judging whether to start ice melting control, comprising the following steps: entering the eighth step; otherwise: entering the tenth step;
eighthly, receiving ice melting control parameters and entering the ninth step;
the ninth step calls the ice-melting control subprogram and enters the tenth step;
step ten, returning to the calling program.
The heat preservation control subprogram is as follows:
setting the maximum control temperature Tmax of an outer conductor; setting the minimum control temperature Tmin of the outer conductor; setting an initial temperature rise time ts; setting temperature adjustment waiting time td; setting the initial position of the tapping contact of the high-voltage head end, and entering the second step;
the output terminal of the on-load tap-changer is connected to the initial position of the tap contact of the head end of the shunt high voltage, and the third step is carried out;
the third step is to wait for ts and enter the fourth step;
step four, receiving the measured temperature value T of the temperature sensing unit, and entering step five;
and a fifth step of judging whether T is greater than Tmax, if yes, entering a sixth step, and if not: entering the eighth step;
sixthly, regulating the current of the inner conductor to be lower by one gear, and entering a seventh step;
step seven, waiting for td, and entering the step ten;
and an eighth step of judging whether T is smaller than Tmin, if yes, entering the ninth step, and if not: entering the tenth step;
step nine, increasing the current of the inner conductor by one gear, and entering the step ten;
step ten, waiting for td, and entering the step ten;
the eleventh step returns to the caller.
The ice-melting control subprogram is as follows:
the method comprises the following steps that firstly, the highest ice melting temperature TRmax of an outer conductor is set; setting the lowest ice melting temperature TRmin of the outer conductor; setting ice melting and temperature rising initial time trs; setting ice melting and temperature adjusting waiting time trd; setting the initial position of a shunting high-voltage head end tapping contact, and entering a second step;
the output terminal of the on-load tap-changer is connected to the initial position of the tap contact of the head end of the shunt high voltage, and the third step is carried out;
the third step waits for trs, and the fourth step is started;
step four, receiving the measured temperature value T of the temperature sensing unit, and entering step five;
and a fifth step of judging whether T is larger than TRmax, if yes, entering a sixth step, and if not: entering the eighth step;
sixthly, regulating the current of the inner conductor to be lower by one gear, and entering a seventh step;
the seventh step waits for trd, and the eleventh step is started;
and the eighth step of judging whether T is less than TRmin, if yes, entering the ninth step, and if not: entering the tenth step;
step nine, increasing the current of the inner conductor by one gear, and entering the step ten;
step ten, waiting for trd, and entering the step ten;
the eleventh step returns to the caller.

Claims (9)

1. The utility model provides an interline can't harm three-phase shunt, is called three-phase shunt for short, and transmission line's transmission of electricity wire adopts coaxial cable structure's self-control hot wire which characterized in that: the interline lossless three-phase shunt (1-n) is arranged between self-control heat conducting wires between a sending end power supply and a receiving end load, the self-control heat conducting wires are divided into a plurality of sections, and the self-control heat conducting wires between the three-phase shunt and the adjacent three-phase shunt at one end of the sending end power supply are called as the last section of self-control heat conducting wires; the self-control hot wire between the three-phase current divider and the adjacent three-phase current divider at the end of the receiving end load is called as the next section of self-control hot wire;
the transmitting end power supply is three-phase output, the receiving end load is three-phase input, the three-phase shunt is provided with a three-phase input end and a three-phase output end, and the three-phase input end is respectively an A-phase input end (2A-1-2A-n), a B-phase input end (2B-1-2B-n) and a C-phase input end (2C-1-2C-n); phase A output ends (3A-1 to 3A-n), phase B output ends (3B-1 to 3B-n) and phase C output ends (3C-1 to 3C-n);
for the A-phase power transmission line, the outer conductors of the adjacent sections of the self-made heat conductors are in short circuit connection, the inner conductor and the outer conductor of each section of the self-made heat conductor, which are close to one end of the sending-end power supply, are in short circuit connection, and the inner conductor, which is close to one end of the receiving-end load, is in short circuit connection with the A-phase input end of the three-phase; the phase A output end of the three-phase shunt is in short-circuit connection with the inner conductor and the outer conductor of the next section of self-made heat conducting wire at the end close to the sending end power supply; the connection method of the B-phase power transmission line and the C-phase power transmission line is similar to that of the A-phase power transmission line;
the interline lossless three-phase shunt consists of three single-phase shunt modules and a microprocessor (78), wherein the single-phase shunt modules externally have 7 interfaces which are respectively a single-phase input end (71), a single-phase output end (72), a single-phase neutral end (73), a temperature communication interface (74), an input switching control interface (75), a motor control interface (76) and an output switching control interface (77); the single-phase shunt module consists of an on-load tap-changer (9), a shunt transformer (12), a voltage-dividing transformer (16), a control motor (18), a first change-over switch (56-1), a second change-over switch (56-2) and a temperature sensing unit (55);
the three-phase shunt has two structures, namely a triangular three-phase shunt and a star three-phase shunt, according to different connection modes of single-phase neutral points, and the three single-phase shunt modules are respectively an A-phase shunt module (79), a B-phase shunt module (80) and a C-phase shunt module (81); the temperature communication interface (74), the input switching control interface (75), the motor control interface (76) and the output switching control interface (77) of the three single-phase shunt modules are all connected with the microprocessor (78); a first change-over switch (56-1) of the single-phase shunt module is connected to the microprocessor through an input change-over control interface (75), and a second change-over switch (56-2) is connected to the microprocessor (78) through an output change-over control interface (77).
2. The interline lossless three-phase shunt of claim 1, wherein: the shunt transformer (12) has three pairs of external connection terminals: a shunt low-voltage head end (11), a shunt high-voltage head end voltage regulating tapping contact (13) and a shunt transformer neutral point (14); the shunt low-voltage head end (11) is in short-circuit connection with the ice melting connection port (40) of the first selector switch (56-1); shunting high-voltage head end tapping contacts (22-1-22-n) of the shunting high-voltage head end voltage regulating tapping contact (13) are in one-to-one short circuit connection with on-load tap-changer tapping selection contacts (10); the neutral point (14) of the shunt transformer is in short-circuit connection with the voltage-dividing low-voltage head end (15) of the voltage-dividing transformer;
the voltage-dividing transformer (16) is externally provided with two connecting ends: a partial pressure low pressure head (15), a partial pressure high pressure head (17); the head end (15) of the partial voltage low voltage is in short-circuit connection with a shunt neutral point (14) of the shunt transformer, and the head end (17) of the partial voltage high voltage is in short-circuit connection with an ice melting connecting terminal of the second change-over switch (56-2);
the temperature sensing unit (55) measures the temperature of the self-made hot wire and transmits the temperature to the microprocessor through the temperature communication interface;
the first change-over switch (56-1) and the second change-over switch (56-2) are respectively connected to the microprocessor (78) through an input change-over control interface (75) and an output change-over control interface (77), and a normal power transmission mode or an anti-icing and de-icing mode is selected under the control of the microprocessor; in a normal power transmission mode, the lead connecting ports (29) of the first changeover switch (56-1) and the second changeover switch (56-2) are in short-circuit connection with the short-circuit connecting port (39); and under the anti-icing and de-icing mode, the wire connecting ports (29) of the first change-over switch (56-1) and the second change-over switch (56-2) are in short-circuit connection with the de-icing connecting port (40).
3. The interline lossless three-phase shunt of claim 1, wherein:
the single-phase input end (71) of the A-phase shunt module (79) of the triangular three-phase shunt is in short-circuit connection with the A-phase input end (2A), and the single-phase output end (72) of the A-phase shunt module is in short-circuit connection with the A-phase output end (3A); the single-phase input end (71) of the phase B shunting module is in short-circuit connection with the phase B input end (2B), and the single-phase output end (72) of the phase B shunting module is in short-circuit connection with the phase B output end (3B); the single-phase input end (71) of the C-phase shunting module is in short-circuit connection with the C-phase input end (2C), and the single-phase output end (72) of the C-phase shunting module is in short-circuit connection with the C-phase output end (3C); the single-phase neutral end (73) of the phase A shunt module is in short-circuit connection with the phase B output end (3B); the single-phase neutral end (73) of the phase B shunt module is in short-circuit connection with the phase C output end (3C); the single-phase neutral end (73) of the C-phase shunt module is in short-circuit connection with the A-phase output end (3A);
the single-phase input end (71) of the star-type three-phase current divider A-phase current dividing module (79) is in short-circuit connection with the A-phase input end (2A), and the single-phase output end (72) of the A-phase current dividing module is in short-circuit connection with the A-phase output end (3A); the single-phase input end (71) of the phase B shunting module is in short-circuit connection with the phase B input end (2B), and the single-phase output end (72) of the phase B shunting module is in short-circuit connection with the phase B output end (3B); the single-phase input end (71) of the C-phase shunting module is in short-circuit connection with the C-phase input end (2C), and the single-phase output end (72) of the C-phase shunting module is in short-circuit connection with the C-phase output end (3C);
the single-phase neutral end (73) of the A-phase shunt module (79), the single-phase neutral end (73) of the B-phase shunt module and the single-phase neutral end (73) of the C-phase shunt module are in short-circuit connection, and the short-circuit connection point is called a star-type neutral point (82); the star point is grounded either not or directly or via a resistor or via a crowbar coil.
4. The interline lossless three-phase shunt of claim 1, wherein: the single-phase input end (71) of the single-phase shunt module is in short-circuit connection with the inner conductor at one end, close to the electric load, of the last section of self-made heat wire and is in short-circuit connection with the wire connecting port (29) of the first change-over switch (56-1); the wire connecting port (29) of the first change-over switch (56-1) is in short-circuit connection with the single-phase input end (71); the short-circuit connection port (39) is in short-circuit connection with the short-circuit connection port (39) of the second changeover switch (56-2); the ice melting connection port (40) is in short-circuit connection with the shunt low-voltage head end (11) of the shunt transformer (12); the single-phase output end (72) is in short-circuit connection with the inner conductor and the outer conductor at one end, close to the power transmission power supply, of the next self-made heat wire, and is in short-circuit connection with a wire connection port (29) of the second change-over switch (56-2); a short-circuit connection port (39) of the second change-over switch (56-2) is in short-circuit connection with a short-circuit connection port (39) of the first change-over switch (56-1), the short-circuit connection port (39) is in short-circuit connection with the short-circuit connection port (39) of the first change-over switch (56-2), and an ice melting connection port (40) is in short-circuit connection with a voltage division high-voltage head end (17) and an on-load tap-changer output terminal (19);
the on-load tap changer (9) has two connection terminals: an output terminal (19) of the on-load tap-changer and a tap-change selection contact (10) of the on-load tap-changer; an output terminal (19) of the on-load tap-changer is in short-circuit connection with an ice melting connection port (40) of the second change-over switch (56-2), and tap-changing selection contacts (10) of the on-load tap-changer are in one-to-one short-circuit connection with tap contacts (22-1-22-n) at the head end of the shunt high voltage.
5. The interline lossless three-phase shunt of claim 1, wherein: the change-over switch is characterized in that a change-over control motor (30) is connected with a rotating connecting rod (31), the change-over control motor (30) rotates the rotating connecting rod (31), and a short-circuit electric brush (32) is fixed at one end of the rotating connecting rod and is in short-circuit connection with a wire connecting port; the change-over switch is externally provided with three connecting terminals which are respectively a lead connecting port (29), a short circuit connecting port (39) and an ice melting connecting port (40);
when the device is used, the lead connecting port (29) is in short-circuit connection with the single-phase input end (71) or the single-phase output end (72), the ice melting connecting port (40) is in short-circuit connection with the output terminal of the on-load tap-changer (9), or is in short-circuit connection with the head end of the shunt low-voltage, and the short-circuit connecting ports (39) of the two change-over switches are in short-circuit connection; the switching control motor is a stepping motor and rotates at any angle under the control of the microprocessor (78), so that the rotating connecting rod rotates at any angle;
when the rotating connecting rod rotates to different angles in the clockwise direction, the following short circuit modes of the short circuit electric brush are completed in sequence:
1) the short-circuit brush is short-circuited with the short-circuit connection contact (33);
2) the short-circuit brush is simultaneously short-circuited with the short-circuit connection contact (33) and the short-circuit connection resistance contact (34);
3) the short circuit electric brush is simultaneously short-circuited with the short circuit connecting resistance contact (34) and the ice melting connecting resistance contact (35);
4) the short circuit electric brush is simultaneously short-circuited with the ice melting connecting resistance contact (35) and the ice melting connecting contact (36);
5) the short circuit brush is short-circuited with the ice melting connecting contact (36);
when the switching control motor rotates clockwise, the control lead connecting port is switched to be in short-circuit connection with the ice melting connecting contact (36) from a short-circuit connection mode with the short-circuit connecting contact (33); when the switching control motor rotates anticlockwise, the control lead connecting port is switched from the short-circuit connection mode with the ice melting connecting contact (36) to the short-circuit connection mode with the short-circuit connecting contact (33);
the short-circuit connection contact (33) is short-circuited to the short-circuit connection port (39);
one end of the short-circuit connecting resistor (37) is connected with the short-circuit connecting resistor contact (34), and the other end is connected with the short-circuit connecting port (39);
ice melt connection contact 36 is short circuited to an ice melt connection port (40);
one end of the ice melting connecting resistor (38) is connected with the ice melting connecting resistor contact (35) in a short circuit mode, and the other end of the ice melting connecting resistor is connected with the ice melting connecting port (40).
6. The interline lossless three-phase shunt of claim 1, wherein: the shunt transformer (12) adopts a step-up transformer, and is divided into a double-winding shunt transformer and an auto-coupling shunt transformer according to different structures, the shunt transformer iron cores conform to the national standard of a three-phase transformer, and shunt transformers of three single-phase shunt modules form a three-phase transformer and share a three-phase transformer iron core;
the double-winding shunt transformer is a transformer structure with two windings, which are respectively called a shunt low-voltage winding (23) and a shunt high-voltage winding (27), and the head ends of the shunt low-voltage winding (23) and the shunt high-voltage winding (23) are homonymous ends; the number of turns of a coil of the shunt low-voltage winding (23) is less than the number of turns of a coil between all shunt high-voltage head-end tapping contacts (22-1-22-n n) and a shunt neutral point; the shunting high-voltage head end tapping contact (13) consists of a plurality of shunting high-voltage head end tapping contacts (22-1-22-n) and is connected to the head end of the shunting high-voltage winding (27); different coil turns are formed by the shunting high-voltage head end tapping contact (22-1-22-n) and the shunting high-voltage winding tail end, wherein the coil turns between the first shunting high-voltage head end tapping contact (22-1) and the shunting high-voltage winding tail end are the least; the number of coil turns between the second shunt high-voltage head end tap contact (22-2) and the shunt high-voltage winding tail end, the number of coil turns between the third shunt high-voltage head end tap contact (22-3) and the shunt high-voltage winding tail end, … …, the number of coil turns between the tail shunt high-voltage head end tap contact (22-n) and the shunt high-voltage winding tail end are sequentially increased, and the number of coil turns between the tail shunt high-voltage head end tap contact (22-n) and the shunt high-voltage winding tail end is the largest; the tail end of the shunt high-voltage winding is the tail end of the shunt high-voltage winding;
shunting high-voltage head end tapping contacts (22-1-22-n) are in one-to-one short-circuit connection with tapping selection contacts of the on-load tapping switch;
the head end (11) of the shunt low voltage is the head end of the shunt low voltage winding; the tail end (24) of the shunt low-voltage winding is the tail end of the shunt low-voltage winding; the tail end (24) of the shunt low-voltage winding is in short-circuit connection with the tail end (26) of the shunt high-voltage winding to form a shunt neutral point;
the auto-coupling shunt transformer adopts an auto-coupling boosting transformer structure, and only one transformer winding is called as an auto-coupling shunt winding; the head end (11) of the shunt low voltage is led out from the middle tap of the auto-coupling shunt winding, and the shunt neutral point is the tail end of the auto-coupling shunt winding; the shunting high-voltage head end tapping contact (13) is composed of a plurality of shunting high-voltage head end tapping contacts (22-1-22-n); a tail shunt high-voltage head end tapping contact (22-n) is the head end of the self-coupling shunt winding;
the number of turns of the coil between the shunt low-voltage head end and the shunt neutral point is less than the number of turns of the coil between all shunt high-voltage head end tapping contacts (22-1-22-n n) and the shunt neutral point;
different coil turns are formed by shunting high-voltage head end tapping contacts (22-1-22-n) and shunting low-voltage winding tail ends, wherein the number of the coil turns of the first shunting high-voltage head end tapping contact (22-1) and a shunting neutral point is the least; the number of turns of the coil of the second shunt high-voltage head end tapping contact (22-2) and the shunt neutral point, the number of turns of the coil of the third shunt high-voltage head end tapping contact (22-3) and the shunt neutral point, … …, the number of turns of the coil of the tail shunt high-voltage head end tapping contact (22-n) and the shunt neutral point are sequentially increased, and the number of turns of the coil of the tail shunt high-voltage head end tapping contact (22-n) and the shunt neutral point is the largest.
7. The interline lossless three-phase shunt of claim 1, wherein: the voltage division transformer adopts a step-up transformer and is divided into the following parts according to different structures: a double winding voltage-dividing transformer, an autotransformer; the voltage dividing transformers of the three single-phase shunt modules form a three-phase transformer, and share a three-phase transformer iron core;
the double-winding voltage-dividing transformer consists of two windings, namely a voltage-dividing low-voltage winding (50) and a voltage-dividing high-voltage winding (52); the number of turns of the coil of the voltage division low-voltage winding is less than that of the turns of the coil of the voltage division high-voltage winding;
the head end (15) of the partial pressure low pressure and the head end (17) of the partial pressure high pressure are homonymous terminals; the voltage division low-voltage terminal (51) and the voltage division high-voltage terminal (53) are in short circuit connection to form a single-phase neutral terminal (73);
turn ratio K of double-winding voltage-dividing transformersv
The voltage-dividing autotransformer is provided with only one winding and is called as a voltage-dividing autotransformer; the head end (17) of the voltage division high voltage is connected with the head end of the self-coupling voltage division winding, and the tail end of the self-coupling voltage division winding forms a single-phase neutral end (73); the head end (15) of the partial voltage low voltage is extracted from the self-coupling partial voltage winding; the number of turns of the coil between the head end (15) of the partial pressure low voltage and the tail end of the self-coupling partial pressure winding is smaller than the number of turns of the coil between the head end (17) of the partial pressure high voltage and the tail end of the self-coupling partial pressure winding; the head end (17) of the partial pressure high pressure and the head end (15) of the partial pressure low pressure are homonymous terminals;
turn ratio K of autotransformerzv
8. A method of design and control using the interline lossless three-phase shunt of claim 1, characterized by: the parameters of the shunt were calculated as:
setting the voltage at the output end of the shunt to VoutThe head end voltage of the divided low voltage is Vds(ii) a The turn ratio of the voltage-dividing transformer is as follows:
and (3) designing the tapping turn ratio of a tapping contact at the head end of the shunt high voltage: the calculation of the number of turns of the coil between the contact point of the shunt high-voltage head end and each shunt neutral point is the key of shunt design; determining the turn ratio of the coil, firstly determining the current of an inner conductor of the self-made hot wire:
inner conductor current calculation: setting the diameter of the inner conductor of the self-made heat conducting wire as DnDiameter of insulating material DjThe diameter of the outer conductor of the self-made heat conductor is Dw(ii) a Resistivity of the inner conductor is rhonThen, the reference current I of the self-made thermal conductor for preventing ice and melting ice0Comprises the following steps:
Figure FDA0002290954970000061
the minimum current flowing through the inner conductor is k of the reference current through the control of the on-load tap-changerminMultiple, kmin<1, k is maximum of reference currentmaxMultiple, kmax>1; the inner conductor is passed a minimum current IminComprises the following steps:
Imin=kminI0
the inner conductor passes the maximum current ImaxComprises the following steps:
Imax=kmaxI0
by control of on-load tap-changers, the current I of the inner conductorn(i) The values that can be controlled are given by the following formula, where i is 1,2,3, … …, n:
and (3) calculating the turn ratio:
setting the self-control thermal lead length between the current divider and the last current divider between the current divider and the sending end power supply to be L, and if no current divider is arranged between the current divider and the sending end power supply, the self-control thermal lead length between the current divider and the power supply is L, and the resistivity of the outer conductor is rhowThe self-made hot wire delivers current IsThe number of turns of the coil between the head end of the shunt low voltage and the shunt neutral point is N1,
inner conductor resistance RnIn order to realize the purpose,
resistance R of outer conductorwIn order to realize the purpose,
the number of turns of a coil between a shunting high-voltage head end tapping contact (22-1-22-n) and a shunting neutral point is N (i), i is 1,2,3, …, n:
n (1) represents the number of turns of a coil between a first shunt high-voltage head end tapping contact (22-1) and a shunt neutral point;
n (2) represents the number of turns of a coil between a second shunt high-voltage head end tapping contact (22-2) and a shunt neutral point;
……
n (n) represents the number of turns of a coil between a tail shunt high-voltage head end tapping contact (22-n) and a shunt neutral point;
the current flowing through the conductor in the self-made hot wire can be controlled by controlling the shunting high-voltage head end tapping contact; when the first shunt high-voltage head-end tap contact (22-1) is in short-circuit connection with an output terminal of the on-load tap-changer, the current flowing through the inner conductor is minimum, the second shunt high-voltage head-end tap contact (22-2) is in short-circuit connection with the output terminal of the on-load tap-changer, the third shunt high-voltage head-end tap contact (22-3) is in short-circuit connection with the output terminal of the on-load tap-changer … …, when the last shunt high-voltage head-end tap contact (22-n) is in short-circuit connection with the output terminal of the on-load tap-changer, the current flowing through the inner conductor of the self-made hot wire is sequentially increased, and when the last shunt high-voltage head-end tap contact (22-n) is.
9. The method of designing and controlling a line-to-line lossless three-phase shunt of claim 8, wherein: the microprocessor shunt is controlled by controlling the three single-phase shunt modules in turn, and a control program comprises a main flow, a single-phase shunt module control subprogram, a heat preservation control subprogram and an ice melting control subprogram;
the main flow is as follows:
calling a phase A shunt module control subprogram, and entering a second step;
calling a phase B shunt module control subprogram, and entering a third step;
step three, calling a phase C shunt module control subprogram, and entering the step one;
wherein:
the control subprogram of the A-phase shunting module refers to a change-over switch, a temperature sensing unit, a change-over switch, a temperature sensing unit and a control motor which are controlled by a microprocessor, wherein the change-over switch, the temperature sensing unit and the control motor are used for controlling the A-phase shunting module, and the control flow is a single-phase shunting module control subprogram;
the control subprogram of the B-phase shunting module refers to a change-over switch, a temperature sensing unit, a change-over switch, a temperature sensing unit and a control motor which are controlled by a microprocessor, wherein the change-over switch, the temperature sensing unit and the control motor are used for controlling the motor to be the B-phase shunting module, and the control flow is a single-phase shunting module control subprogram;
the control subprogram of the C-phase shunting module refers to a change-over switch, a temperature sensing unit, a change-over switch, a temperature sensing unit and a control motor which are controlled by a microprocessor, wherein the change-over switch, the temperature sensing unit and the control motor are used for controlling the motor to be the C-phase shunting module, and the control flow is a single-phase shunting module control subprogram;
the single-phase shunt module control subprogram is as follows:
the first step is to receive a control command and enter the second step;
the second step judges whether to start the anti-icing and de-icing control, and comprises the following steps: the change-over switch is switched to the anti-icing and de-icing mode, and the fourth step is operated; otherwise: operating the third step;
the third step, the change-over switch is switched to a normal power transmission mode, and the tenth step is entered;
step four, judging whether to start heat preservation control, and if so, judging that: entering the fifth step; otherwise: entering the seventh step;
step five, receiving heat preservation control parameters, and entering step six;
sixthly, calling a heat preservation control subprogram, and entering the tenth step;
step seven, judging whether to start ice melting control, comprising the following steps: entering the eighth step; otherwise: entering the tenth step;
eighthly, receiving ice melting control parameters and entering the ninth step;
the ninth step calls the ice-melting control subprogram and enters the tenth step;
step ten, returning to the calling program;
the heat preservation control subprogram is as follows:
setting the maximum control temperature Tmax of an outer conductor; setting the minimum control temperature Tmin of the outer conductor; setting an initial temperature rise time ts; setting temperature adjustment waiting time td; setting the initial position of the tapping contact of the high-voltage head end, and entering the second step;
the output terminal of the on-load tap-changer is connected to the initial position of the tap contact of the head end of the shunt high voltage, and the third step is carried out;
the third step is to wait for ts and enter the fourth step;
step four, receiving the measured temperature value T of the temperature sensing unit, and entering step five;
and a fifth step of judging whether T is greater than Tmax, if yes, entering a sixth step, and if not: entering the eighth step;
sixthly, regulating the current of the inner conductor to be lower by one gear, and entering a seventh step;
step seven, waiting for td, and entering the step ten;
and an eighth step of judging whether T is smaller than Tmin, if yes, entering the ninth step, and if not: entering the tenth step;
step nine, increasing the current of the inner conductor by one gear, and entering the step ten;
step ten, waiting for td, and entering the step ten;
the eleventh step returns to the calling program;
the ice-melting control subprogram is as follows:
the method comprises the following steps that firstly, the highest ice melting temperature TRmax of an outer conductor is set; setting the lowest ice melting temperature TRmin of the outer conductor; setting ice melting and temperature rising initial time trs; setting ice melting and temperature adjusting waiting time trd; setting the initial position of a shunting high-voltage head end tapping contact, and entering a second step;
the output terminal of the on-load tap-changer is connected to the initial position of the tap contact of the head end of the shunt high voltage, and the third step is carried out;
the third step waits for trs, and the fourth step is started;
step four, receiving the measured temperature value T of the temperature sensing unit, and entering step five;
and a fifth step of judging whether T is larger than TRmax, if yes, entering a sixth step, and if not: entering the eighth step;
sixthly, regulating the current of the inner conductor to be lower by one gear, and entering a seventh step;
the seventh step waits for trd, and the eleventh step is started;
and the eighth step of judging whether T is less than TRmin, if yes, entering the ninth step, and if not: entering the tenth step;
the ninth step is to increase the current of the inner conductor by one gear and the tenth step is carried out
Step ten, waiting for trd, and entering step eleventh
The eleventh step returns to the caller.
CN201811488302.2A 2018-12-06 2018-12-06 Interline lossless three-phase current divider and design and control method Expired - Fee Related CN109347041B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811488302.2A CN109347041B (en) 2018-12-06 2018-12-06 Interline lossless three-phase current divider and design and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811488302.2A CN109347041B (en) 2018-12-06 2018-12-06 Interline lossless three-phase current divider and design and control method

Publications (2)

Publication Number Publication Date
CN109347041A CN109347041A (en) 2019-02-15
CN109347041B true CN109347041B (en) 2020-01-24

Family

ID=65297345

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811488302.2A Expired - Fee Related CN109347041B (en) 2018-12-06 2018-12-06 Interline lossless three-phase current divider and design and control method

Country Status (1)

Country Link
CN (1) CN109347041B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113507086B (en) * 2021-07-14 2022-06-21 四川大学 Passive lossless three-phase anti-icing and de-icing control equipment for strain tower

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2308136C2 (en) * 2005-06-30 2007-10-10 Виталий Яковлевич Башкевич Method and device for identifying kind of deposits on intermediate span conductor in overhead power transmission line
CN101257198A (en) * 2008-04-17 2008-09-03 李杨扬 Ice melting system of high tension power line with load operation
CN101604833A (en) * 2009-06-05 2009-12-16 湖南省电力公司试验研究院 A kind of ground wire deicing device of use capable of being combined
RU2621068C1 (en) * 2016-07-06 2017-05-31 Акционерное общество "Научно-технический центр Федеральной сетевой компании Единой энергетической системы" Reactive power compensation and ice-melting combination device on the basis of the driven shunt reactor transformer
CN108366442A (en) * 2018-04-23 2018-08-03 四川大学 The self-control heat conductor and heating equipment and its implementation of embedded insulating heat-conduction material
CN108695806A (en) * 2018-08-24 2018-10-23 四川大学 Embedded heating material is from ice-melt conducting wire anti-icing control method online
CN108790949A (en) * 2017-05-05 2018-11-13 天津中铁电气化设计研究院有限公司 A kind of electrical design method for preventing direct current overhead contact line from freezing
CN209298846U (en) * 2018-12-06 2019-08-23 四川大学 Lossless three-phase current divider between line

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2308136C2 (en) * 2005-06-30 2007-10-10 Виталий Яковлевич Башкевич Method and device for identifying kind of deposits on intermediate span conductor in overhead power transmission line
CN101257198A (en) * 2008-04-17 2008-09-03 李杨扬 Ice melting system of high tension power line with load operation
CN101604833A (en) * 2009-06-05 2009-12-16 湖南省电力公司试验研究院 A kind of ground wire deicing device of use capable of being combined
RU2621068C1 (en) * 2016-07-06 2017-05-31 Акционерное общество "Научно-технический центр Федеральной сетевой компании Единой энергетической системы" Reactive power compensation and ice-melting combination device on the basis of the driven shunt reactor transformer
CN108790949A (en) * 2017-05-05 2018-11-13 天津中铁电气化设计研究院有限公司 A kind of electrical design method for preventing direct current overhead contact line from freezing
CN108366442A (en) * 2018-04-23 2018-08-03 四川大学 The self-control heat conductor and heating equipment and its implementation of embedded insulating heat-conduction material
CN108695806A (en) * 2018-08-24 2018-10-23 四川大学 Embedded heating material is from ice-melt conducting wire anti-icing control method online
CN209298846U (en) * 2018-12-06 2019-08-23 四川大学 Lossless three-phase current divider between line

Also Published As

Publication number Publication date
CN109347041A (en) 2019-02-15

Similar Documents

Publication Publication Date Title
CN109449854B (en) Station-used lossless three-phase current divider for preventing ice and melting ice and design and control method
CN109361187B (en) Line-to-line lossless single-phase shunt and design and control method
CN109361186B (en) Station-used lossless single-phase shunt for preventing ice and melting ice and design and control method
CN108366442A (en) The self-control heat conductor and heating equipment and its implementation of embedded insulating heat-conduction material
CN109347041B (en) Interline lossless three-phase current divider and design and control method
CN101714426A (en) Electricity transmission cooling system
Maruyama et al. Results of Japan's first in-grid operation of 200-MVA superconducting cable system
CN206225052U (en) It is a kind of from ice melting electric cable and its ice-melting device
CN103915809B (en) A kind of alternating current circuit for multiple fission conductor does not have a power failure de-icing method and device thereof
CN101459327B (en) Automatic ice melting method for multiple division electricity transmission line and special switch thereof
CN209298845U (en) Lossless single-phase current divider between line
CN209046216U (en) The lossless single-phase current divider in station for anti-icing ice-melt
CN209298846U (en) Lossless three-phase current divider between line
CN108923365B (en) Transmission line wire suitable for live online ice melting and use method thereof
CN201302835Y (en) Overhead wire for current-uninterrupted automatic ice-melting
CN201341007Y (en) High-low voltage power line deicing vehicle
CN209282791U (en) The lossless three-phase current divider in station for anti-icing ice-melt
CN100578882C (en) Ice melting system of high voltage transmission line with load operation
CN113078603A (en) Ice melting device for power line
CN101350234B (en) Outer layer insulation mongline round wire concentric gallows empty conductor and automatic deicing apparatus
CN203689973U (en) High-resistance steel core ice-melting lead
CN201251941Y (en) Outer layer insulating single-line insulating round-line concentric stranded wire overhead line conductor and an automatic thawing apparatus
CN215120054U (en) Ice melting device for power line
CN101295863A (en) Self-heating ice and snow-proof aerial electric power line for securing steady operation of electric network without power-off
CN201178282Y (en) Loaded operating ice melting system for high-voltage power transmission line

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CB03 Change of inventor or designer information
CB03 Change of inventor or designer information

Inventor after: Li Bixiong

Inventor after: Mo Site

Inventor before: Mo Site

Inventor before: Li Bixiong

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200124

Termination date: 20201206