Self-coupling phase-shifting transformer with safe switching function

Abstract

The utility model discloses a self-coupling phase-shifting transformer with a safe switching function, and particularly relates to the field of self-coupling phase-shifting transformers, which comprises an iron core, a high-voltage winding, a voltage-regulating winding, a public winding, a phase-regulating winding, a voltage-regulating on-load tap-changer, a phase-regulating on-load tap-changer and a no-load reversing tap-changer, the iron core comprises three central columns, and each central column is sequentially provided with a phase modulation winding, a voltage regulation winding, a common winding and a high-voltage winding from inside to outside. According to the utility model, when the potential of the tail end of the common winding is zero and the phase modulation on-load tap-changer is at a rated tap-changer position, the second electric mechanism of the no-load reversing tap-changer can be operated, and at the moment, the self-coupling phase-shifting transformer is at a zero phase angle position; the polarity conversion of the no-load commutation tap-changer can be ensured under the specific condition of zero phase angle, the safe operation of the no-load commutation tap-changer can be protected, and the safe switching is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of self coupling phase shifting transformer, more particularly, the utility model relates to a self coupling phase shifting transformer with safety switching function. BACKGROUND

[0002] The single-core self coupling phase shifting transformer with no-load commutating switch mainly comprises a three-column core, a high-voltage winding, a voltage regulating winding, a common winding, a phase regulating winding, a voltage regulating on-load tap changer, a phase regulating on-load tap changer and a no-load commutating tap changer.

[0003] The high-voltage winding and the voltage regulating winding are respectively connected in series before the common winding, the voltage regulating winding is connected to the voltage regulating on-load tap changer according to the tap sequence number, the voltage regulating on-load tap changer is connected to the low-voltage outlet, the common winding is connected in series with the no-load commutating tap changer at the end, the no-load commutating tap changer is connected in series with the out-of-phase phase regulating winding according to a certain rule, the phase regulating winding is connected together through the phase regulating on-load tap changer, and the star connection is connected to the neutral point.

[0004] Therefore, the voltage amplitude and the phase angle of the low-voltage outlet relative to the high-voltage are changed by adjusting the number of turns of the voltage regulating winding and the phase regulating winding in the circuit, and the maximum change range of the phase angle of the low-voltage outlet relative to the high-voltage is adjusted by the polarity conversion of the no-load commutating tap changer when the phase angle is zero.

[0005] The polarity conversion of the no-load commutating tap changer can only be operated under the specific condition of zero phase angle (zero phase angle refers to the case that the phase difference of the voltage and current waveforms is zero, that is, they pass through the zero point at the same time. In this case, the polarity conversion can minimize the influence on the power system and avoid the generation of excessive current and voltage fluctuation), in order to prevent misoperation and realize the safety switching of the polarity conversion of the no-load commutating tap changer, protection measures need to be set. UTILITY MODEL CONTENTS

[0006] The self coupling phase shifting transformer with safety switching function provided by the utility model solves the problem that the existing no-load commutating tap changer has no protection measures during polarity conversion and may misoperate and affect safety switching.

[0007] To achieve the above object, the utility model provides the following technical scheme: A self -coupling phase -shift transformer with safe switching function, the self -coupling phase -shift transformer includes core, high -voltage winding, voltage regulating winding, public winding, phase modulation winding, voltage regulating on -load tap changer, phase modulation on -load tap changer and no -load reversing tap changer, the core includes three center columns, three center columns are sequentially provided with phase modulation winding, voltage regulating winding, public winding, high -voltage winding from inside to outside side respectively, be provided with potential monitoring structure on the self -coupling phase -shift transformer, and this potential monitoring structure is used for monitoring the end potential of public winding, the interlocking structure is arranged between the electric mechanism one for driving phase modulation on -load tap changer and the electric mechanism two for driving no -load reversing tap changer, when the potential monitoring structure detects that the end potential of public winding is zero, and phase modulation on -load tap changer is at the rated tap position, the interlocking structure is unlocked to electric mechanism two, so that electric mechanism two can drive no -load reversing tap changer and work.

[0008] In a preferred embodiment, the potential monitoring structure includes an external PT, the public winding includes a terminal y monitoring terminal, and the y monitoring terminal is provided with a potential monitoring y bushing, the external PT is arranged on the potential monitoring y bushing, and the external PT is used to monitor the end potential of the public winding.

[0009] In a preferred embodiment, when the phase modulation on-load tap changer is at the rated tap position, the phase modulation winding is withdrawn from the circuit.

[0010] In a preferred embodiment, the end of the public winding is connected in series with the common terminal two of the no-load reversing tap changer, and the common terminal one of the no-load reversing tap changer and the common terminal four of the no-load reversing tap changer are both connected in series with the phase modulation winding.

[0011] In a preferred embodiment, the moving contact outlet end of the voltage regulating on-load tap changer and the moving contact outlet end of the phase modulation on-load tap changer are both provided with a low-voltage lead-out wire, and the phase modulation on-load tap changer has a plurality of phase modulation on-load tap changers, the low-voltage lead-out wires of the plurality of phase modulation on-load tap changers are connected in star and form a neutral point, and the neutral point is provided with a bushing N.

[0012] In a preferred embodiment, the tap lines of the voltage regulating winding are provided with a plurality of groups, and the plurality of groups of tap lines are numbered in sequence, and the plurality of groups of tap lines of the voltage regulating winding are connected to the voltage regulating on-load tap changer according to the tap number, and by adjusting the tap position of the voltage regulating on-load tap changer and the voltage regulating winding, the number of turns of the voltage regulating winding connected to the circuit is changed, so that the voltage amplitude of the low-voltage lead-out wire of the voltage regulating on-load tap changer and the phase angle compared with the high voltage are changed.

[0013] In a preferred embodiment, the tap lines of the phase-modulating winding are provided with several groups, and the several groups of tap lines are sequentially numbered, and the several groups of tap lines of the phase-modulating winding are connected to the phase-modulating on-load tap changer according to the tap numbers, and by adjusting the tap positions of the phase-modulating on-load tap changer and the phase-modulating winding, the number of turns of the phase-modulating winding in the circuit is changed, so that the voltage amplitude of the low-voltage outgoing line of the phase-modulating on-load tap changer and the phase angle compared with the high voltage are changed.

[0014] In a preferred embodiment, a terminal K is arranged on the voltage-regulating winding, and the terminal of the high-voltage winding and the terminal K of the voltage-regulating winding are connected together with the first end of the common winding.

[0015] The self-coupled phase-shifting transformer has the advantages that:

[0016] The self-coupled phase-shifting transformer has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The self-coupled phase-shifting transformer has the advantages that:

[0018] Figure 2 The self-coupled phase-shifting transformer has the advantages that:

[0019] Figure 3 The self-coupled phase-shifting transformer has the advantages that:

[0020] Figure 4 The self-coupled phase-shifting transformer has the advantages that:

[0021] Figure 5 The self-coupled phase-shifting transformer has the advantages that:

[0022] Figure 6 The self-coupled phase-shifting transformer has the advantages that:

[0023] Figure 7 The self-coupled phase-shifting transformer has the advantages that:

[0024] The reference signs are: 1, high-voltage winding; 2, voltage regulating winding; 3, common winding; 4, phase regulating winding; 5, voltage regulating on-load tap changer; 6, phase regulating on-load tap changer; 7, no-load switching tap changer; 8, high-voltage side terminal; 9, low-voltage side terminal; 10, neutral point terminal; 11, y monitoring terminal; 12, built-in zinc oxide arrester; 13, core. DETAILED DESCRIPTION

[0025] The following detailed description of the application is made with reference to the accompanying drawings, it is necessary to point out here that the following detailed description is only used to further illustrate the application, and cannot be understood as limiting the scope of protection of the application, and those skilled in the art can make some non-essential improvements and adjustments to the application according to the above application content.

[0026] Referring to the drawings accompanying the specification Figures 1 to 7 A self-coupling phase-shifting transformer with a safe switching function, the self-coupling phase-shifting transformer includes a core 13, a high-voltage winding 1, a voltage regulating winding 2, a common winding 3, a phase regulating winding 4, a voltage regulating on-load tap changer 5, a phase regulating on-load tap changer 6 and a no-load switching tap changer 7, the core 13 includes three center columns, the three center columns are sequentially provided from inside to outside with the phase regulating winding 4, the voltage regulating winding 2, the common winding 3, the high-voltage winding 1; The self-coupling phase-shifting transformer is provided with a potential monitoring structure, which is used for monitoring the terminal potential of the common winding 3; An interlocking structure is arranged between an electric mechanism one for driving the phase regulating on-load tap changer 6 and an electric mechanism two for driving the no-load switching tap changer 7; When the potential monitoring structure detects that the terminal potential of the common winding 3 is zero, and the phase regulating on-load tap changer 6 is in the rated tap position, the interlocking structure unlocks the electric mechanism two, so that the electric mechanism two can drive the no-load switching tap changer 7 to work.

[0027] It should be noted that the electric mechanism two mainly includes a motor, a driving device and a mechanical device, the motor is used for providing power and driving force, the driving device is used for transmitting the movement of the motor to the no-load switching tap changer 7, the driving device is composed of a transmission shaft, a transmission gear, a chain or a belt, etc., which is used for converting the rotary movement of the motor into linear or rotary mechanical movement, the mechanical device is the part connecting the motor and the switch, which is used to realize the switching operation of the tap, the mechanical device includes gears, connecting rods, transmission mechanisms and tap connecting mechanisms, under the driving of the motor, the mechanical device can connect the tap to different positions, so as to increase or decrease the voltage of the transformer, through the tap switching operation of the no-load switching tap changer 7, so as to realize the voltage regulation and power distribution of the power system, the combination of the motor and the driving device makes the switching of the tap can be realized by remote or automatic control, which improves the convenience of operation and the automation degree of the system.

[0028] Further, the potential monitoring structure comprises an external PT, the common winding 3 comprises a terminal y monitoring terminal 11, and a potential monitoring y bushing is arranged on the y monitoring terminal 11, and the external PT is arranged on the potential monitoring y bushing, and the external PT is used for monitoring the terminal potential of the common winding 3.

[0029] It should be noted that the external PT is a device used for measuring voltage in a power system, which is usually installed on a power device or a power line, and is used to reduce a high voltage signal to a lower measurable range, and the main function of the external PT is to convert a high voltage signal into a low voltage signal proportional to it, so as to perform monitoring, measurement and protection operations, and the external PT is usually used in cooperation with devices such as measuring instruments, protection devices or monitoring systems. The potential monitoring bushing is a device used for monitoring the potential of the winding, which is usually installed at the end of the winding, and provides a closed space for installing potential monitoring equipment to monitor the voltage or potential of the winding. Through the potential monitoring bushing, the potential change of the winding can be monitored in real time, so as to timely discover abnormal conditions or faults and take corresponding measures. The external PT is used for measuring the voltage signal, and the potential monitoring bushing is used to provide a space for installing the potential monitoring equipment to monitor the potential change of the winding. Their application in the power system aims to realize voltage measurement and potential monitoring to ensure the safe operation of the system and the protection of the equipment.

[0030] Further, when the phase-modulating on-load tap changer 6 is in the rated tap position, the phase-modulating winding 4 is withdrawn from the circuit.

[0031] Further, the terminal of the common winding 3 is connected in series with the common terminal two of the no-load tap changer 7, and the common terminal one of the no-load tap changer 7 and the common terminal four of the no-load tap changer 7 are both connected in series with the phase-modulating winding 4.

[0032] Further, the movable contact outlet of the voltage-regulating on-load tap changer 5 and the movable contact outlet of the phase-modulating on-load tap changer 6 are both provided with low-voltage lead-out lines, and the phase-modulating on-load tap changer 6 is provided with a plurality of phase-modulating on-load tap changers 6, the low-voltage lead-out lines of the plurality of phase-modulating on-load tap changers 6 are connected in star connection, and a neutral point is formed, and a bushing N is arranged on the neutral point.

[0033] Further, the tap lines of the voltage-regulating winding 2 are provided with a plurality of groups, and the plurality of groups of tap lines are sequentially numbered, and the plurality of groups of tap lines of the voltage-regulating winding 2 are connected to the voltage-regulating on-load tap changer 5 according to the tap numbers, and by adjusting the tap positions of the voltage-regulating on-load tap changer 5 and the voltage-regulating winding 2, the number of turns of the voltage-regulating winding 2 connected to the circuit is changed, so that the voltage amplitude of the low-voltage lead-out line of the voltage-regulating on-load tap changer 5 and the phase angle compared with the high voltage are changed.

[0034] Further, the tap lines of the phase-modulating winding 4 are provided with several groups, and the several groups of tap lines are numbered in sequence. The several groups of tap lines of the phase-modulating winding 4 are connected to the phase-modulating on-load tap changer 6 according to the tap numbers. By adjusting the tap positions of the phase-modulating on-load tap changer 6 and the phase-modulating winding 4, the number of turns of the phase-modulating winding 4 in the circuit is changed, so that the voltage amplitude of the low-voltage outgoing line of the phase-modulating on-load tap changer 6 and the phase angle compared with the high voltage are changed.

[0035] It should be noted that the several groups of tap lines of the voltage-regulating winding 2 and the several groups of tap lines of the phase-modulating winding 4 are numbered in sequence according to one of continuous numerical numbers, percentages or voltage levels.

[0036] Further, the voltage-regulating winding 2 is provided with a terminal K, and the end of the high-voltage winding 1, the terminal K of the voltage-regulating winding 2 and the start of the common winding 3 are connected together.

[0037] In the embodiment, the implementation scenario is as follows: before the high-voltage winding 1 and the voltage-regulating winding 2 are respectively connected in series on the common winding 3, the voltage-regulating winding 2 is connected to the voltage-regulating on-load tap changer 5 according to the tap sequence number, the outgoing line of the voltage-regulating on-load tap changer 5 is taken as the low-voltage outgoing line, the end of the common winding 3 is connected in series with the no-load commutating tap changer 7, the phase-modulating winding 4 is connected in series according to the design rule after the no-load commutating tap changer 7, the outgoing lines of the phase-modulating winding 4 are connected together through the outgoing line end of the phase-modulating on-load tap changer 6, a star connection is formed and a neutral point is led out, the number of turns of the voltage-regulating winding 2 and the phase-modulating winding 4 in the circuit is adjusted, so that the voltage amplitude of the low-voltage outgoing line and the phase angle compared with the high voltage are changed, a terminal y is led out at the end of the common winding 3 and a potential monitoring bushing is arranged, the potential at the end of the common winding 3 is monitored in real time by an external PT during operation, when the potential at the end of the common winding 3 is zero, the electric mechanism two of the no-load commutating tap changer 7 can be operated, the maximum change range of the phase angle of the low-voltage outgoing line compared with the high voltage is adjusted through the polarity conversion of the no-load commutating tap changer 7, when the electric mechanism one of the phase-modulating on-load tap changer 6 and the electric mechanism two of the no-load commutating tap changer 7 are interlocked and linked, only when the phase angle is zero, i.e. the phase-modulating on-load tap changer 6 is in the rated tap position, the electric mechanism two of the no-load commutating tap changer 7 can be operated when the phase-modulating winding 4 is withdrawn from the circuit, when the phase-modulating on-load tap changer 6 is in the remaining tap positions, the electric mechanism two of the no-load commutating tap changer 7 cannot be operated, when the potential at the end of the common winding 3 is zero and the phase-modulating on-load tap changer 6 is in the rated tap position, the electric mechanism two of the no-load commutating tap changer 7 can be operated, which indicates that the autotransformer phase-modulating transformer is in the zero phase angle position, so that the no-load commutating tap changer 7 can perform polarity conversion under the specific condition of zero phase angle, the safe operation of the no-load commutating tap changer 7 is ensured, and the safe switching is realized.

[0038] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. An autotransformer with a safe switching function, characterized in that, The self-coupling phase-shifting transformer comprises a core (13), a high-voltage winding (1), a voltage-regulating winding (2), a common winding (3), a phase-regulating winding (4), a voltage-regulating on-load tap changer (5), a phase-regulating on-load tap changer (6) and an off-load reversing tap changer (7), the core (13) comprises three center columns, and the three center columns are sequentially provided with the phase-regulating winding (4), the voltage-regulating winding (2), the common winding (3) and the high-voltage winding (1) from inside to outside; The self-coupling phase-shifting transformer is provided with a potential monitoring structure for monitoring the terminal potential of the common winding (3); The phase-regulating on-load tap changer (6) is provided with an electric mechanism one, the off-load reversing tap changer (7) is provided with an electric mechanism two, and an interlocking structure is arranged between the electric mechanism one and the electric mechanism two; When the terminal potential of the common winding (3) is zero and the phase-regulating on-load tap changer (6) is in the rated tap position, the interlocking structure unlocks the electric mechanism two, so that the electric mechanism two can drive the off-load reversing tap changer (7) to work.

2. The auto-phase-shift transformer with the safe switching function according to claim 1, characterized in that: The potential monitoring structure comprises an external PT, the common winding (3) comprises a terminal y monitoring terminal (11), the y monitoring terminal (11) is provided with a potential monitoring y bushing, and the external PT is arranged on the potential monitoring y bushing and used for monitoring the terminal potential of the common winding (3).

3. The auto-phase-shift transformer with the safe switching function according to claim 2, characterized in that: When the phase-regulating on-load tap changer (6) is in the rated tap position, the phase-regulating winding (4) is withdrawn from the circuit.

4. A self-coupled phase-shifting transformer with a safety switching function according to claim 3, characterized in that: The terminal of the common winding (3) is connected in series with a common terminal two of the off-load reversing tap changer (7), and a common terminal one of the off-load reversing tap changer (7) and a common terminal four of the off-load reversing tap changer (7) are both connected in series with the phase-regulating winding (4).

5. The auto-phase-shift transformer with the safe switching function according to claim 4, characterized in that: The moving contact outlet end of the voltage-regulating on-load tap changer (5) and the moving contact outlet end of the phase-regulating on-load tap changer (6) are both provided with low-voltage lead-out lines, the phase-regulating on-load tap changer (6) comprises a plurality of phase-regulating on-load tap changers (6), the low-voltage lead-out lines of the plurality of phase-regulating on-load tap changers (6) are connected in star connection and form a neutral point, and the neutral point is provided with a bushing N.

6. The auto-phase-shift transformer with the safe switching function according to claim 5, characterized in that: The tap lines of the voltage-regulating winding (2) are provided with a plurality of groups, the plurality of groups of tap lines are sequentially numbered, the plurality of groups of tap lines of the voltage-regulating winding (2) are connected to the voltage-regulating on-load tap changer (5) according to the tap numbers, the voltage amplitude of the low-voltage lead-out lines of the voltage-regulating on-load tap changer (5) and the phase angle compared with the high voltage are changed by adjusting the tap positions of the voltage-regulating on-load tap changer (5) and the voltage-regulating winding (2) and changing the number of turns of the voltage-regulating winding (2) connected to the circuit.

7. The auto-phase-shift transformer with the safe switching function according to claim 6, characterized in that: The tap line of the phase-modulation winding (4) is provided with several groups, and the several groups of tap lines are sequentially numbered, and the several groups of tap lines of the phase-modulation winding (4) are connected to the phase-modulation on-load tap changer (6) according to the tap numbers, the turn number of the phase-modulation winding (4) connected to the circuit is changed by adjusting the tap position of the phase-modulation on-load tap changer (6) and the phase-modulation winding (4), so that the voltage amplitude of the low-voltage lead-out line of the phase-modulation on-load tap changer (6) and the phase angle compared with the high voltage are changed.

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