CN214753343U - Anti-resonance voltage transformer with grounding compensation function based on Z-shaped wiring - Google Patents
Anti-resonance voltage transformer with grounding compensation function based on Z-shaped wiring Download PDFInfo
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- CN214753343U CN214753343U CN202121428772.7U CN202121428772U CN214753343U CN 214753343 U CN214753343 U CN 214753343U CN 202121428772 U CN202121428772 U CN 202121428772U CN 214753343 U CN214753343 U CN 214753343U
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Abstract
The utility model discloses a prevent resonance voltage transformer based on Z type wiring has ground compensation function, including PT primary winding, PT secondary winding and unshakable in one's determination, PT primary winding's neutral point and damping resistance series connection and ground connection, series connection has arc suppression coil between PT primary winding's neutral point and the damping resistance, and the both sides of damping resistance are parallelly connected and are provided with the control switch subassembly. The utility model discloses PT primary winding adopts Z type wiring and through arc suppression coil, damping resistance ground connection for voltage transformer has the suppression resonance function, has concurrently and holds a class compensation function to system's ground connection, and damping resistance drops into or amputates by the control automation from triggering formula bidirectional thyristor switch. When the system is normal, the damping resistor can simulate the increase of 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, and the arc suppression coil outputs inductive current to compensate the earth capacitance current of the power grid, so that the earth compensation function is realized.
Description
Technical Field
The utility model relates to an electric power system distribution technical field, more specifically relate to a prevent resonance voltage transformer that has ground connection compensation function based on Z type wiring.
Background
Voltage transformers are instruments for transforming voltages, similar to transformers. 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.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve provides a prevent resonance voltage transformer that has ground compensation function based on Z type wiring, influence the measurement accuracy of PT secondary voltage, the wiring is complicated, the reliability is not high, application scope is narrow, the problem that PT burns out easily with solving the method that present prevention restraines ferromagnetic resonance, in order to restrain PT series resonance voltage and rise, and when the single-phase earth fault of system, can compensate the ground capacitance current of reactance output inductive current compensation electric wire netting, realize ground compensation function.
In order to solve the technical problem, the utility model adopts the following technical proposal.
The utility model provides a prevent resonance voltage transformer that has ground compensation function based on Z type wiring, includes PT primary winding, PT secondary winding and unshakable in one's determination, PT primary winding adopts the Z type wiring, and PT primary winding's neutral point and damping resistance series connection that can restrain PT series resonance voltage and rise are grounded, and series connection has arc suppression coil between PT primary winding's neutral point and the damping resistance, and damping resistance's both ends are parallelly connected to be provided with can be when the single-phase earth fault of system short circuit damping resistance fast to make arc suppression coil realize the control switch subassembly of ground compensation function.
Further optimizing the technical scheme, the control switch component is a self-triggering bidirectional silicon controlled switch.
Further optimizing the technical scheme, the iron core adopts a three-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 measuring winding used for measuring phase voltage and line voltage and a power supply winding used for providing a power supply.
Further optimizing the technical scheme, the measuring winding adopts Z-shaped wiring.
Further optimizing the technical scheme, the power winding adopts Y-shaped wiring.
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 utility model has the following technical progress.
The utility model is suitable for a 6 ~ 66kV distribution system installs in the PT cabinet of transformer substation, and PT primary winding adopts Z type wiring and through arc suppression coil, damping resistance ground connection for voltage transformer has the suppression resonance function, has concurrently and holds a class compensation function to system's ground connection, and damping resistance is by the automatic input or the excision of the control from triggering formula bidirectional thyristor switch. When the system is normal, the damping resistor can simulate the increase of 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, and the arc suppression coil outputs inductive current to compensate the earth capacitance current of the power grid, so that the earth compensation function is realized.
The utility model has the advantages that the PT secondary winding is provided with the measuring winding and the power supply winding, which can provide voltage measurement and power supply; the PT cabinet is formed by matching secondary control devices, and the display of system line voltage, phase voltage and zero sequence voltage, the measurement of system ground capacitance current and the monitoring and display of system ground capacitance current can be realized at any time.
Drawings
FIG. 1 is a circuit diagram of the present invention;
fig. 2 is a schematic structural view of the iron core of the present invention;
fig. 3 is a circuit connection diagram of the PT primary winding of the present invention;
fig. 4 is a circuit connection diagram of the measurement winding of the present invention;
fig. 5 is a circuit diagram of the power winding of the present invention.
Wherein: 1. PT primary winding, 2, PT secondary winding, 22, measuring winding, 23, power supply winding, 3, arc suppression coil, 4, damping resistor, 5, self-triggering bidirectional thyristor switch, 6 and single-phase double-winding PT.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
An anti-resonance voltage transformer with a grounding compensation function based on Z-shaped wiring is shown in a combined mode in fig. 1 to 5 and comprises a PT primary winding 1, a PT secondary winding 2 and an iron core.
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.
An arc suppression coil 3 is connected in series between the neutral point of the PT primary winding 1 and the damping resistor 4, two ends of the damping resistor 4 are provided with control switch components 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 arc suppression coil 3 realizes the earth compensation function.
The iron core adopts a three-column iron core structure. The PT primary winding 1 adopts a Z-shaped connection.
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 comprises a primary winding and a secondary winding, and the primary winding is connected between the neutral point of the PT primary winding 1 and the ground in series. And the LX1 in the secondary winding is connected in series between the neutral point of the measurement winding and the ground. Secondary winding for providing two measured zero sequence voltages U with different transformation ratios0。
The PT secondary winding 2 includes a measurement winding 22 and a power supply winding 23.
The measurement winding 22 adopts Z-shaped wiring, can realize phase compensation and meet PT measurement angleDifference requirement, measurable Ua、Ub、UcPhase voltage sum Uab、Uac、UbcLine voltage.
The power winding 23 adopts a Y-shaped connection, 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 measuring winding 22 is connected with a measuring instrument, and the line voltage, the phase voltage and the zero sequence voltage of the system can be displayed by connecting the secondary measuring winding. And (3) loading the capacitance current measuring instrument into the capacitance current measuring instrument, calculating the capacitance current to ground of the measuring system in real time by measuring the real-time data of zero sequence voltage and zero sequence current and matching with fixed parameters such as arc suppression coil impedance, damping resistance value and the like, and monitoring and displaying the capacitance current to ground of the system at any time.
The utility model can measure phase voltage, line voltage, phase-to-ground voltage and zero sequence voltage, can output maximum 5A or 10A inductive current after grounding, is used for compensating system capacitance current, has automatic switching damping resistance, and can avoid series resonance overvoltage in normal operation; the power supply is provided with a three-phase power supply winding, and can provide a three-phase 380V power supply and a single-phase 220V power supply; a system earth capacitance current measuring device can be added to monitor/display the system earth capacitance current at any time; the PT cabinet is formed, and phase voltage, line voltage, relative ground voltage, zero sequence voltage and system ground capacitance current display are arranged on the PT cabinet.
The utility model discloses an optimize PT primary winding, PT secondary winding wiring, integrate arc suppression coil, damping resistance and annex for voltage transformer not only possesses conventional function, still has suppression system resonance overvoltage and ground connection simultaneously and holds a current compensation function.
The utility model discloses PT primary winding adopts the wiring of Z type to draw forth the neutral point, PT primary winding is through arc suppression coil, damping resistance ground connection, and damping resistance meets from triggering formula bidirectional thyristor switch. When the system is normal, the damping resistor can simulate the increase of 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 arc suppression coil outputs inductive current to compensate the earth capacitance current of the power grid, and the earth compensation function is realized.
Claims (9)
1. The utility model provides a prevent resonance voltage transformer that has ground compensation function based on Z type wiring, includes PT primary winding (1), PT secondary winding (2) and unshakable in one's determination, its characterized in that: PT primary winding (1) adopts the Z type wiring, and the neutral point of PT primary winding (1) and damping resistance (4) series connection that can restrain PT series resonance voltage and rise are grounded, and series connection has arc suppression coil (3) between the neutral point of PT primary winding (1) and damping resistance (4), and the both ends of damping resistance (4) are parallelly connected to be provided with can be when the single-phase earth fault of system short circuit damping resistance fast to make arc suppression coil (3) realize the control switch subassembly of ground compensation function.
2. The anti-resonance voltage transformer with the grounding compensation function based on the Z-shaped wiring as claimed in claim 1, wherein: the control switch component is a self-triggering bidirectional silicon controlled switch.
3. The anti-resonance voltage transformer with the grounding compensation function based on the Z-shaped wiring as claimed in claim 1, wherein: the iron core adopts a three-column iron core structure.
4. The anti-resonance voltage transformer with the grounding compensation function based on the Z-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.
5. The anti-resonance voltage transformer with the grounding compensation function based on the Z-shaped wiring as claimed in claim 1, wherein: the PT secondary winding (2) comprises a measuring winding (22) for measuring phase voltage and line voltage and a power supply winding (23) for providing power supply.
6. The anti-resonance voltage transformer with the grounding compensation function based on the Z-shaped wiring as claimed in claim 5, wherein: the measuring winding (22) is connected in a Z shape.
7. The anti-resonance voltage transformer with the grounding compensation function based on the Z-shaped wiring as claimed in claim 5, wherein: the power winding (23) adopts Y-shaped wiring.
8. The anti-resonance voltage transformer with the grounding compensation function based on the Z-shaped wiring as claimed in claim 5, wherein: the power winding (23) can provide three-phase 380V and single-phase 220V power supply.
9. The anti-resonance voltage transformer with the grounding compensation function based on the Z-shaped wiring as claimed in claim 5, wherein: the measuring winding (22) is connected with a measuring instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121428772.7U CN214753343U (en) | 2021-06-25 | 2021-06-25 | Anti-resonance voltage transformer with grounding compensation function based on Z-shaped wiring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121428772.7U CN214753343U (en) | 2021-06-25 | 2021-06-25 | Anti-resonance voltage transformer with grounding compensation function based on Z-shaped wiring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214753343U true CN214753343U (en) | 2021-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121428772.7U Active CN214753343U (en) | 2021-06-25 | 2021-06-25 | Anti-resonance voltage transformer with grounding compensation function based on Z-shaped wiring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214753343U (en) |
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2021
- 2021-06-25 CN CN202121428772.7U patent/CN214753343U/en active Active
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