CN113410035A - Anti-resonance voltage transformer with grounding compensation function based on Y-shaped wiring - Google Patents
Anti-resonance voltage transformer with grounding compensation function based on Y-shaped wiring Download PDFInfo
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- CN113410035A CN113410035A CN202110712716.4A CN202110712716A CN113410035A CN 113410035 A CN113410035 A CN 113410035A CN 202110712716 A CN202110712716 A CN 202110712716A CN 113410035 A CN113410035 A CN 113410035A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/24—Voltage transformers
- H01F38/26—Constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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Abstract
The invention discloses an anti-resonance voltage transformer with a ground compensation function based on Y-shaped wiring, which comprises a PT primary winding, a PT secondary winding and an iron core, wherein a neutral point of the PT primary winding is connected with a damping resistor in series and is grounded, a compensation reactor is connected between the neutral point of the PT primary winding and the damping resistor in series, and two sides of the damping resistor are provided with control switch assemblies in parallel, wherein the control switch assemblies can be used for quickly short-circuiting the damping resistor when a system is in single-phase ground fault so as to enable the compensation reactor to realize the ground compensation function. The PT primary winding adopts Y-shaped wiring and is grounded through a compensation reactor and a damping resistor, and the damping resistor is automatically switched on or switched off under the control of a self-triggering bidirectional silicon controlled switch; when the system is normal, the damping resistor is put into use to inhibit the increase of the PT series resonance voltage; when the system is in single-phase earth fault, the self-triggering bidirectional silicon controlled switch is in short circuit with the damping resistor quickly, the compensation reactor outputs inductive current to compensate the earth capacitance current of the power grid, and the earth compensation function is realized.
Description
Technical Field
The invention relates to the technical field of power distribution of a power system, in particular to an anti-resonance voltage transformer with a grounding compensation function based on Y-shaped wiring.
Background
A voltage transformer is an electrical device for converting voltage, similar to a transformer. However, the purpose of transforming voltage by the transformer is to conveniently transmit electric energy, so that the capacity is very large, and usually kilovolt-ampere or mega volt-ampere is taken as a calculation unit; the voltage transformer is mainly used for supplying power to a measuring instrument and a relay protection device, measuring the voltage, power and electric energy of a line, or protecting valuable equipment, a motor and a transformer in the line when the line fails, so that the capacity of the voltage transformer is small, generally only a few volt-amperes and dozens of volt-amperes, and the maximum voltage of the voltage transformer does not exceed one thousand volt-amperes.
In a 6-66 kV power grid neutral point ungrounded system, when an electromagnetic voltage transformer is disturbed from the outside of the system or reaches an excitation condition state, ferromagnetic resonance is easy to occur. When the voltage transformer generates ferromagnetic resonance, the fuse in the cabinet can be burnt lightly, and the voltage transformer explodes seriously.
However, the existing voltage transformer does not have the function of inhibiting ferromagnetic resonance, and the prevention methods adopted at present mainly include the following methods.
1) The neutral point of the mutual inductor is grounded through the first harmonic eliminator, the first harmonic eliminator (zinc oxide valve plate component) is connected between the PT neutral point and the ground in series, and when the system generates ferromagnetic resonance, the resonance is eliminated by utilizing the fact that the system is in a high-resistance state and the voltage is limited to be increased. The disadvantage of this method is that it affects the accuracy of the measurement of the PT secondary voltage.
2) And a neutral point on the PT high-voltage side is grounded through a single-phase zero-sequence voltage transformer, namely a 4PT harmonic elimination method. The method has the disadvantages of complex wiring and low reliability.
3) And the opening angle of the PT secondary winding is connected with a resistor in parallel to realize secondary harmonic elimination. The method has the disadvantages that the resonant frequency is related to the resistance value, and the application range is narrow.
4) A microcomputer resonance elimination device is installed in the PT cabinet, and resonance is eliminated by breaking the resonance condition through the on-off of a switch. The method has the defects that the open triangular voltage is increased due to the fact that system faults (bus line breakage, transformer and system capacitor resonance) cannot be identified, and PT is burnt due to the fact that the resonance elimination circuit cannot be withdrawn in time.
Disclosure of Invention
The invention provides an anti-resonance voltage transformer with a grounding compensation function based on Y-shaped wiring, which aims to solve the problems that the existing method for preventing and inhibiting ferromagnetic resonance influences the measurement precision of PT secondary voltage, the wiring is complex, the reliability is not high, the application range is narrow, and PT is easy to burn out, so that the increase of PT series resonance voltage is inhibited, and in the case of single-phase grounding fault of a system, reactance output inductive current can be compensated to compensate the grounding capacitance current of a power grid, so that the grounding compensation function is realized.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A resonance-proof voltage transformer with a grounding compensation function based on Y-shaped wiring comprises a PT primary winding, a PT secondary winding and an iron core, wherein a neutral point of the PT primary winding is connected in series with a damping resistor capable of inhibiting the increase of PT series resonance voltage and is grounded, a compensation reactor is connected in series between the neutral point of the PT primary winding and the damping resistor, and two sides of the damping resistor are provided with control switch assemblies in parallel, wherein the control switch assemblies can be used for quickly short-circuiting the damping resistor when a system is in single-phase grounding fault so as to enable the compensation reactor to realize the grounding compensation function; the control switch component is a self-triggering bidirectional silicon controlled switch.
Further optimizing the technical scheme, the PT primary winding adopts Y-shaped wiring.
According to the technical scheme, the iron core is of a three-phase five-column type iron core structure.
According to the technical scheme, a single-phase double-winding PT for measuring zero-sequence voltage is further connected between the neutral point of the PT primary winding and the ground.
According to the technical scheme, the PT secondary winding comprises a balance winding, a measurement winding and a power supply winding, wherein the balance winding is connected in series end to end and used for reducing zero-sequence impedance, the measurement winding is used for measuring voltage, and the power supply winding is used for providing a power supply.
According to the technical scheme, the measuring winding and the power supply winding are connected in a Y-shaped mode.
According to the technical scheme, the measuring winding can measure phase voltage and line voltage.
According to the technical scheme, the power supply winding can provide a three-phase 380V power supply and a single-phase 220V power supply.
Further optimizing technical scheme, the measurement winding is connected with measuring instrument.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
The invention is suitable for a 6-66 kV power distribution system, is arranged in a PT cabinet of a transformer substation, an iron core is set to be a three-phase five-column structure, a PT primary winding adopts Y-shaped wiring and is grounded through a compensation reactor and a damping resistor, and the damping resistor is automatically switched on or switched off under the control of a self-triggering bidirectional thyristor switch. When the system is normal, the damping resistor is put into use to inhibit the increase of the PT series resonance voltage; when the system is in single-phase earth fault, the self-triggering bidirectional silicon controlled switch is in short circuit with the damping resistor quickly, the compensation reactor outputs inductive current to compensate the earth capacitance current of the power grid, and the earth compensation function is realized.
The PT secondary winding is provided with the balance winding, so that zero-sequence impedance can be reduced; the PT secondary winding is provided with a measuring winding and a power supply winding and can provide voltage measurement and power supply; the PT cabinet is formed by matching secondary measuring devices, and the display of system line voltage, phase voltage and zero sequence voltage, the measurement of system earth capacitance current and the monitoring and display of system earth capacitance current can be realized at any time.
Drawings
FIG. 1 is a circuit diagram of the present invention;
FIG. 2 is a schematic view of a core structure according to the present invention;
FIG. 3 is a circuit diagram of the PT primary winding of the present invention;
FIG. 4 is a circuit diagram of a balanced winding of the present invention;
FIG. 5 is a circuit diagram of a measurement winding according to the present invention;
fig. 6 is a circuit diagram of the power winding of the present invention.
Wherein: 1. PT primary winding, 2, PT secondary winding, 21, balance winding, 22, measurement winding, 23, power supply winding, 3, compensation reactor, 4, damping resistor, 5, self-triggering bidirectional thyristor switch, 6, single-phase double-winding PT, 61, primary winding, 62, secondary winding, 7 and bus.
Detailed Description
The invention will be described in further detail below with reference to the figures and specific examples.
An anti-resonance voltage transformer with a grounding compensation function based on Y-shaped wiring is shown in a combined mode in fig. 1 to 6 and comprises a PT primary winding 1, a PT secondary winding 2 and an iron core.
The PT primary winding 1 is connected with a three-phase line of a bus 7, and the bus 7 is a 10kV bus. The PT primary winding 1 adopts a Y-shaped connection.
The neutral point of the PT primary winding 1 is connected in series with the damping resistor 4 and grounded, and the damping resistor 4 can suppress the rise of the PT series resonance voltage.
A compensation reactor 3 is connected in series between the neutral point of the PT primary winding 1 and the damping resistor 4, control switch components are arranged on two sides of the damping resistor 4 in parallel, and the control switch components are self-triggering bidirectional silicon controlled switches KKG. The self-triggering bidirectional silicon controlled switch 5 can quickly short-circuit the damping resistor when the system is in single-phase earth fault, so that the compensation reactor 3 realizes the earth compensation function.
The iron core adopts a three-phase five-column type iron core structure.
And a single-phase double-winding PT is also connected between the neutral point of the PT primary winding 1 and the ground, and is used for measuring zero-sequence voltage. The single-phase double winding PT includes a primary winding 61 and a secondary winding 62, and the primary winding 61 is connected in series between the neutral point of the PT primary winding 1 and the ground. LX1 in secondary winding 62 is connected in series between the neutral point of the measurement winding and ground. The secondary winding 62 is used to provide two measured zero sequence voltages U of different transformation ratios0。
The PT secondary winding 2 includes a balance winding 21, a measurement winding 22, and a power supply winding 23.
The balance windings 21 are connected in series end to end for reducing the zero sequence impedance.
The measurement winding 22 is used for measuring the voltage, the measurement winding 22 being able to measure the phase voltage Ua、Ub、UcLine voltage Uab、Uac、Ubc。
The power winding 23 is used for providing power supply, and the power winding 23 can provide power supply of 380V in three phases and 220V in single phase.
The measurement winding 22 and the power supply winding 23 are respectively connected in a Y-shape.
A measuring instrument is arranged in the PT cabinet, and the line voltage, the phase voltage and the zero sequence voltage of the system can be displayed by connecting a secondary measuring winding. The PT cabinet is internally provided with a capacitance current measuring instrument, the capacitance current to ground of the measuring system is calculated in real time by measuring real-time data of zero-sequence voltage and zero-sequence current and matching with fixed parameters such as compensation reactance impedance, damping resistance value and the like, and the capacitance current to ground of the system is monitored and displayed constantly.
The PT primary winding 1 of the invention is grounded through a compensation reactance and a damping resistor, and the damping resistor is automatically switched on or switched off under the control of a self-triggering bidirectional silicon controlled switch. When the system is normal, the damping resistor is put into use to inhibit the increase of the PT series resonance voltage; when the system has single-phase earth fault, the self-triggering bidirectional silicon controlled switch KKG is in short circuit with the damping resistor quickly, the compensation reactor outputs inductive current, and the constant current compensation function of the power grid earth capacitance current is realized.
Claims (8)
1. The utility model provides an anti-resonance voltage transformer that has ground compensation function based on Y type wiring, includes PT primary winding (1), PT secondary winding (2) and unshakable in one's determination, its characterized in that: the PT primary winding (1) is in Y-shaped connection, a neutral point of the PT primary winding (1) is connected with a damping resistor (4) capable of inhibiting the increase of PT series resonance voltage in series and is grounded, a compensation reactor (3) is connected between the neutral point of the PT primary winding (1) and the damping resistor (4) in series, and two ends of the damping resistor (4) are provided with a control switch assembly in parallel, wherein the control switch assembly can be used for quickly short-circuiting the damping resistor when a system is in single-phase ground fault so that the compensation reactor (3) can realize a ground compensation function; the control switch component is a self-triggering bidirectional silicon controlled switch.
2. The anti-resonance voltage transformer with the grounding compensation function based on the Y-shaped wiring as claimed in claim 1, wherein: the iron core is of a three-phase five-column type iron core structure.
3. The anti-resonance voltage transformer with the grounding compensation function based on the Y-shaped wiring as claimed in claim 1, wherein: and a single-phase double-winding PT (6) for measuring zero-sequence voltage is also connected between the neutral point of the PT primary winding (1) and the ground.
4. The anti-resonance voltage transformer with the grounding compensation function based on the Y-shaped wiring as claimed in claim 1, wherein: the PT secondary winding (2) comprises a balance winding (21) which is connected end to end in series and used for reducing zero sequence impedance, a measuring winding (22) used for measuring voltage and a power supply winding (23) used for providing power supply.
5. The anti-resonance voltage transformer with the grounding compensation function based on the Y-shaped wiring as claimed in claim 4, wherein: the measuring winding (22) and the power supply winding (23) are respectively connected in a Y shape.
6. The anti-resonance voltage transformer with the grounding compensation function based on the Y-shaped wiring as claimed in claim 4, wherein: the measurement winding (22) is capable of measuring phase voltages and line voltages.
7. The anti-resonance voltage transformer with the grounding compensation function based on the Y-shaped wiring as claimed in claim 4, wherein: the power winding (23) can provide three-phase 380V and single-phase 220V power supply.
8. The anti-resonance voltage transformer with the grounding compensation function based on the Y-shaped wiring as claimed in claim 4, wherein: the measuring winding (22) is connected with a measuring instrument.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712716.4A CN113410035B (en) | 2021-06-25 | 2021-06-25 | Anti-resonance voltage transformer with grounding compensation function based on Y-shaped wiring |
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| CN202110712716.4A CN113410035B (en) | 2021-06-25 | 2021-06-25 | Anti-resonance voltage transformer with grounding compensation function based on Y-shaped wiring |
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| CN113410035A true CN113410035A (en) | 2021-09-17 |
| CN113410035B CN113410035B (en) | 2023-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115792781A (en) * | 2022-12-28 | 2023-03-14 | Abb瑞士股份有限公司 | Monitoring device, power equipment and method for monitoring voltage transformer |
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| CN113410035B (en) | 2023-06-23 |
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