WO2016201968A1 - Dispositif régulateur de tension de distribution de puissance à basse tension - Google Patents

Dispositif régulateur de tension de distribution de puissance à basse tension Download PDF

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Publication number
WO2016201968A1
WO2016201968A1 PCT/CN2016/070462 CN2016070462W WO2016201968A1 WO 2016201968 A1 WO2016201968 A1 WO 2016201968A1 CN 2016070462 W CN2016070462 W CN 2016070462W WO 2016201968 A1 WO2016201968 A1 WO 2016201968A1
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WO
WIPO (PCT)
Prior art keywords
voltage
line
low
contactor
transformer
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PCT/CN2016/070462
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English (en)
Chinese (zh)
Inventor
施博一
夏文
孟领刚
王新明
夏武
王春生
冯国伟
王宗臣
Original Assignee
江苏现代电力科技股份有限公司
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Publication of WO2016201968A1 publication Critical patent/WO2016201968A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load

Definitions

  • the invention relates to the technical field of electric engineering, in particular to a low voltage distribution network voltage regulating device.
  • the technical purpose of the present invention is to provide a low-voltage power distribution voltage regulating device that can directly connect to a power grid without modifying an existing low-voltage line, in view of the problems existing in the prior art.
  • the technical solution disclosed by the present invention is:
  • a low-voltage power distribution voltage regulating device characterized in that it comprises the following components:
  • a line-in device with an incoming busbar and an incoming circuit breaker connected to the incoming line supply line;
  • An outlet device having an outlet busbar connected to the load line
  • An autotransformer transformer the input end of which is connected to the output end of the incoming line device, the output end of which is connected to the input end of the outlet device, and the incoming line breaker is connected in series to the input end of the auto-transformer transformer On the connection line with the incoming line device;
  • An action actuator comprising a plurality of contactors, one end of each contactor being connected to the input end of the auto-transformer transformer, the connection point being located on the outgoing side of the line breaker, and the other end of each contact being connected to the auto-coupling
  • the primary coil of the transformer transformer corresponds to a different number of gear positions
  • a control unit is connected to the action actuator, and the control action actuator performs on/off of each contactor.
  • the control unit includes a rectifying circuit, and the external alternating current power source is connected to the action executing mechanism through the rectifying circuit, and the converted electric energy is used as a driving power source of the action executing mechanism.
  • the rectifier circuit is provided with a capacitor C1, a rectifier diode and a filter capacitor C2, and the capacitor C1 is connected in series On one of the incoming lines of the external AC power supply, the two sides of the capacitor C1 are short-circuited by a circuit, and each of the contactors is respectively connected to the circuit in a normally closed contact.
  • the contactors of the action actuator are in the off state, the main contact is disconnected, the normally closed contact (auxiliary contact) of the contactor is in a closed state, the capacitor C1 is short-circuited, and the AC voltage is rectified by the diode to output a DC high.
  • Piezoelectric drive action actuator contactor pull-in when any contactor is closed, its normally closed contact is open, then the circuit of short-circuit capacitor C1 is disconnected, then the capacitor C1 supplies power to the diode, at this time the diode
  • the rectified DC voltage is small, and only the capacitor C2 maintains a DC low voltage to supply power to the coil of the actuator of the actuator, maintains the contact state of the contactor, and ensures reliable engagement of the actuator.
  • a conventional 220V AC contactor can be used, which can save costs compared to using a low voltage DC contactor.
  • the low-voltage power distribution voltage regulating device of the present invention is provided with a contactor coil interlocking structure, the contactor coil interlocking structure includes an interlocking circuit corresponding to each contactor coil; and the interlocking circuit is connected in series with a contactor a normally open contact (auxiliary contact) of the coil and the contactor, and a normally closed contact (auxiliary contact) of the other contactors, and the interlock circuit of each contactor coil is connected in parallel and then connected to the action actuator Drive the power circuit.
  • control unit is further provided with a power supply interlocking structure for the action executing mechanism, wherein the power supply interlocking structure is provided with a control module corresponding to each contactor, and each control module includes a driving action mechanism for connecting the action actuators.
  • a first switch corresponding to the interlock circuit of the contactor coil, a second switch serially connected to the other contactor interlock circuits, and a jog electromagnetic driving mechanism for controlling the first switch and the second switch to be turned on and off;
  • the first switch and the second switch in each mode control module are interlocking switches.
  • the outlet device is provided with a manual bypass circuit breaker for short-circuiting the auto-coupled voltage-regulating transformer.
  • a manual bypass circuit breaker for short-circuiting the auto-coupled voltage-regulating transformer.
  • the contactor of the action actuator includes an automatic bypass contactor. After the automatic bypass contactor is engaged, the input voltage of the auto-coupled voltage regulating transformer is equal to the output voltage.
  • the low-voltage power distribution voltage regulating device of the present invention further comprises a capacitor and a low-voltage power distribution measuring and controlling device, wherein the low-voltage power distribution measuring and controlling device is connected to the control unit to perform information interaction; the capacitor is set in an auto-coupling The output side of the voltage regulating transformer is connected to the low-voltage power distribution measuring and controlling device, and the low-voltage power distribution measuring and controlling device inputs and cuts the capacitor according to the lack of reactive power.
  • the incoming line device is provided with an incoming line transformer for monitoring an electrical signal of the incoming line power supply line
  • the outgoing line device is provided with an outgoing line transformer for monitoring the electrical signal of the load line, wherein the incoming line transformer and the outgoing line transformer respectively Connected to the control unit, the control unit automatically inputs an auto-coupled voltage regulating transformer according to the current/voltage condition of the power supply side or the load side or cuts the auto-coupled voltage regulating transformer into a reasonable gear position.
  • a lightning arrester is disposed in the line feeding device and the outlet device.
  • the low-voltage power distribution voltage regulating device of the invention can be conveniently connected to the power grid, and effectively solves the terminal voltage in the low-voltage line of the rural distribution station without increasing the 10kV line, adding the distribution transformer, and not modifying the low-voltage line. Qualified problem, voltage compensation for low voltage at the end of the power grid is a more economical way to solve the terminal voltage in rural power grid. On the basis of further technical solutions, the low-voltage power distribution voltage regulating device of the invention can be safe and reliable. Running.
  • Figure 1 is a schematic view of the structure of the present invention
  • FIG. 2 is a schematic diagram of a circuit structure of an autotransformer transformer and a contactor
  • FIG. 3 is a schematic structural view of a rectifier circuit of a control unit
  • FIG. 4 is a schematic circuit diagram of shorting the capacitor C1 of FIG. 3;
  • Figure 5 is a schematic structural view of a power supply interlocking structure
  • Figure 6 is a schematic view showing the structure of the interlocking structure of the contactor coil.
  • a low-voltage power distribution voltage regulating device as shown in FIG. 1 includes a cooling fan 1, an incoming line device 4, an outlet device 9, an auto-coupled voltage transformer 2, an action actuator 4, a smart capacitor 19, and a detection control alarm device 20, etc.
  • the incoming line device 4 is provided with an incoming current transformer 5, an incoming circuit breaker 6, an incoming busbar 7, and an incoming lightning arrester 8.
  • the outlet device 9 is provided with an outgoing current transformer 10, a manual bypass breaker 11, an outgoing busbar 12, and an outgoing lightning arrester 13.
  • the detection control alarm device 20 is provided with a low-voltage power distribution measuring and controlling device 21, a control unit 22 with a microprocessor as a core, and an operating status indicator lamp 23.
  • An infrared temperature measuring sensor 3 is disposed on the auto-coupled voltage regulating transformer 2.
  • the motion actuator 14 is provided with a voltage output 1st contactor 16 (hereinafter replaced by KM1), a voltage output 2nd contactor 17 (hereinafter replaced by KM2), and a voltage output 3rd contactor 18 (hereinafter replaced by KM3) And automatic bypass contactor 15 (hereinafter replaced by KM4).
  • the voltage regulation principle of the autotransformer 2 is as shown in FIG. 2, and the input end of the autotransformer 2 is connected to the output end of the line feeder 4, and the line breaker 6 (hereinafter referred to K1 instead) is connected in series with the connection line
  • K1 line breaker 6
  • One end of each contactor KM1, KM2, KM3, KM4 of the action actuator 14 is connected to the outgoing side of the line breaker 6, and the other end is connected to the gear of the primary coil of the autotransformer corresponding to different turns.
  • the auto-coupled voltage regulating transformer 2 is thus connected to the incoming power supply line.
  • KM2 and KM3 are similar to the voltage when KM1 is pulled in, but only change the turns ratio of the primary and secondary coils of the transformer to obtain a larger induced voltage dU.
  • the incoming lightning arrester 8 and the outgoing lightning arrester 13 function as lightning protection and surge protection.
  • the incoming lightning arrester 8 and the outgoing lightning arrester 13 are respectively connected with the incoming busbar 7 and the outgoing busbar 12, and the grounding terminal and the grounding wire are connected. connection.
  • the action actuator 14 adopts DC high voltage pull-in, and the control unit 22 includes a rectifier circuit.
  • the external AC power source is connected to the action actuator 14 through the rectifier circuit, and the converted DC high voltage power is used as the drive of the action actuator 14. power supply.
  • the rectifier circuit is provided with a capacitor C1, a plurality of rectifier diodes, and a filter capacitor C2.
  • the capacitor C1 is connected in series to an incoming line connected to an external AC power source, and both sides of the capacitor C1 pass through FIG.
  • One of the circuits shown is shorted, and each contactor is respectively connected with a normally closed contact (auxiliary contact) KMA1, KMA2, KMA3, KMA4 in the circuit.
  • KMA1, KMA2, KMA3, and KMA4 are all in a closed state.
  • the KA5 terminal is directly connected to the UAIN terminal of the external AC power source, and the capacitor C1 is short-circuited, and the AC voltage passes through the diode.
  • the rectification of the DC high voltage drive action actuator is engaged.
  • any contactor is closed, the corresponding normally closed contact KMA1/KMA2/KMA3/KMA4 is disconnected, and UAIN supplies power to KA5 through C1.
  • the DC voltage rectified by the diode is small, and only the capacitor C2 maintains a DC low voltage.
  • the coil of the pull-in contactor is energized to maintain the pull-in state of the contactor, ensuring reliable engagement of the actuator actuator 14 at low voltages.
  • the four-speed switch position of the action actuator 14 needs to be interlocked, and only one pull-in, multi-stage protection, including the interlocking of the coils between the contactors, the power supply interlock of the control unit, and the interlocking of the output lines of the software.
  • the contactor coil interlocking structure is as shown in FIG. 6, and includes four parallel interlocking circuits, a coil of any contactor of the action actuator 14 and a normally open contact (auxiliary contact) of the contactor, and other contactors.
  • a normally closed contact (auxiliary contact) is connected in series to form one of the interlock circuits, and the interlock circuit corresponding to each contactor is connected in parallel to the driving power supply circuit of the action actuator 14. As shown in FIG. 6, and includes four parallel interlocking circuits, a coil of any contactor of the action actuator 14 and a normally open contact (auxiliary contact) of the contactor, and other contactors.
  • a normally closed contact (auxiliary contact) is connected in series to form one of the interlock circuits, and the interlock circuit corresponding to each contactor is connected in parallel to the driving power supply circuit of the action actuator 14.
  • FIG. 6 The contactor coil interlocking structure is as shown in FIG. 6, and includes four parallel interlocking circuits, a coil of any contactor of the action actuator 14 and a normally open
  • the KM1 coil is connected to the power input terminal OT1 through the normally closed contacts of KM2, KM3, and KM4, and when the OT1 has DC high voltage, KM1
  • the coil is turned on, the KM1 normally open contact is closed, and the normally closed contacts of all KM1 are disconnected, then the KM2 coil, the KM3 coil, and the KM4 coil are de-energized, and the interlock circuits of other contactor coils work similarly.
  • the power supply interlocking structure of the control unit 22 for the motion actuator 14 is as shown in FIG. 5, and a control module is provided corresponding to each contactor, and each control module includes a driving action power supply KZUA end and a corresponding contactor coil. a first switch of the interlock circuit, three second switches serially connected to the other contactor interlock circuits, and a jog electromagnetic drive mechanism for controlling the first switch and the second switch to be turned on and off, in each control module The first switch and the second switch are interlocking switches.
  • the jog electromagnetic driving mechanism includes a 12V power supply and a coil J1, and the first switch located between “8-4-12” is located at " Pulling or disconnecting the three second switches between 5-1-9", “6-2-10", and “7-3-11", when the coil J1 is energized, the first switch is pulled, so that The KZUA terminal is connected to the KC1 terminal, and the three second switches are disconnected, so that the J2-8 connection J3-10, the J3-8 connection J2-10, and the J4-8 connection J2-11 are disconnected, so that the OT2 and the OT3 are disconnected.
  • J2-8 in the first control module indicates that the point is connected to the position 8 in the second module
  • J3-8 indicates that the point is connected to the position 8 in the third module
  • J4-8 indicates the point and the fourth module Position 8 is connected
  • the explanations for other symbols such as J3-10, J2-11, etc. are the same as above.
  • the second switch between the second switch, the second switch between the fourth control module "5-1-9" is connected to the OT1 end of the contactor coil interlock circuit, so that the OT1 terminal in FIG. 6 has DC high voltage, KM1
  • the KM1 normally open contact is closed.
  • the coil of the jog electromagnetic drive mechanism is de-energized, and the first switch of the first control module is restored to the off state, and the second switch Resume the closed state.
  • Other control modules work the same way.
  • the infrared temperature sensor 3 detects the real-time temperature of the auto-transformer transformer 2 and transmits it to the control unit 22.
  • the control unit 22 drives the heat-dissipating fan 1 according to the temperature, thereby effectively reducing the heat inside the device, improving the operational reliability of the device, and prolonging the service life.
  • the smart capacitor 19 is connected to the voltage output side of the auto-transformer transformer 2, and is connected to the low-voltage power distribution measuring and controlling device 21, and the low-voltage power distribution measuring and controlling device 21 performs the input and the cutting of the smart capacitor 19 according to the vacancy of the reactive power.
  • the voltage regulating transformer 2 adjusts the voltage, reasonable reactive power compensation is performed to reduce the line loss.
  • the low-voltage power distribution measuring and controlling device 21 is connected to the control unit 22, and the operating state, power distribution parameters, and the like of the components in the device are obtained through information interaction.
  • the low-voltage power distribution measurement and control device 21 can remotely monitor the operation status of the user side of the distribution network and the remote adjustment of the voltage by logging in to the server background.
  • the operation status indicator 23 is convenient for running on-site monitoring, and outputs a protection signal when the protection occurs, reminding the worker Maintenance in time.
  • the voltage regulating device of the invention comprises various protection modes, such as output overcurrent protection, overvoltage protection, undervoltage protection, autotransformation transformer 2 over temperature protection, lightning protection, surge protection, main circuit, secondary circuit short circuit Protection and so on.
  • the manual bypass circuit breaker 11 is used when the invention fails to repair the fault, and only needs to manually disconnect the incoming circuit breaker 6 to cut off the incoming power supply, and close the manual bypass breaker 11 to short the T1 outgoing coil to achieve voltage loss.
  • the output can completely isolate the core components of the low-voltage power distribution voltage regulating device of the present invention, and does not affect the normal use of the rear-side users.
  • the automatic bypass contactor 15 is used to control the pull-in automatic bypass contactor 15 through the low control unit 22 when the temporary fault occurs in the present invention, temporarily isolating the voltage regulating function of the auto-coupled voltage regulating transformer, and when the fault is recovered, it can be immediately put into service.
  • the control unit 22 can detect the line voltage (incoming side) of the low voltage side of the autotransformer 2 through the transformer, and automatically input the different gears of the autotransformer 2 when the line voltage is lower than the set input threshold.
  • the line voltage is higher than the cut-off threshold, the auto-transformer transformer 2 is automatically cut into a reasonable gear position, so that the line voltage reaches the qualified range, so that the voltage quality on the user side is effectively improved.
  • the low-voltage power distribution voltage regulating device of the invention can be divided into single-phase voltage regulation, three-phase voltage regulation and phase separation voltage regulation.
  • the pressure regulating action actuator 14 only needs to include a set of contactors 15-18, and the split-phase pressure regulating action actuator 14 needs to include exactly the same three sets of contactors 15-18.

Abstract

L'invention concerne un dispositif régulateur de tension de distribution de puissance à basse tension, comprenant les parties constitutives suivantes : un appareil de ligne entrante (4) comportant une barre omnibus (7) de ligne entrante, laquelle est connectée à une ligne d'alimentation électrique de ligne entrante, et un disjoncteur de ligne (6) de ligne entrante ; un appareil de ligne sortante (6) comportant une barre omnibus (12) de ligne sortante connectée à une ligne de charge ; un autotransformateur régulateur (2) ; un mécanisme d'exécution d'action (4) comprenant une pluralité de contacteurs (15, 16, 17, 18), une extrémité de chaque contacteur étant connectée à une extrémité d'entrée de l'autotransformateur régulateur et l'autre extrémité étant respectivement connectée à une position de bouton d'un enroulement primaire de l'autotransformateur régulateur correspondant à un nombre de spires différent ; et une unité de commande (22), le mécanisme d'exécution d'action étant connecté à l'unité de commande. Le dispositif régulateur de tension peut être facilement connecté à un réseau électrique, et dans le cas où une ligne à 10 kV n'est pas ajoutée, l'absence d'ajout d'un transformateur de distribution de puissance et de changement d'une ligne à basse tension peut résoudre le problème lié au fait qu'une tension de bornes dans une ligne à basse tension d'un district de transformateurs électriques dans une zone rurale ne se qualifie pas et procéder à une compensation de tension sur une basse tension à la borne du réseau électrique.
PCT/CN2016/070462 2015-06-16 2016-01-08 Dispositif régulateur de tension de distribution de puissance à basse tension WO2016201968A1 (fr)

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CN201510331145.4A CN104882891B (zh) 2015-06-16 2015-06-16 低压配电调压设备
CN201510331145.4 2015-06-16

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