CN210744725U - Tracking resonance elimination device - Google Patents
Tracking resonance elimination device Download PDFInfo
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- CN210744725U CN210744725U CN201921601806.0U CN201921601806U CN210744725U CN 210744725 U CN210744725 U CN 210744725U CN 201921601806 U CN201921601806 U CN 201921601806U CN 210744725 U CN210744725 U CN 210744725U
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Abstract
The utility model discloses a tracking harmonic elimination device for solve voltage transformer's resonance problem, including micro-processing module, first signal acquisition module, signal processing circuit, harmonic elimination resistance matrix, first signal acquisition module is used for gathering the open triangle return current of mutual-inductor, and first signal acquisition module is connected with the signal processing circuit electricity; the signal processing circuit is used for processing the signals acquired by the first signal acquisition module and is electrically connected with the micro-processing module; the micro-processing module analyzes and calculates according to the signal transmitted by the signal processing circuit, controls the resistance value of the resonance elimination resistance matrix, and is electrically connected with the resonance elimination resistance matrix; the resonance elimination resistance matrix is electrically connected with the voltage transformer. The utility model discloses a track the triangular magnitude of voltage of mutual-inductor opening, the resistance of dynamic change harmonic elimination resistance for harmonic elimination resistance power and mutual-inductor winding power phase-match eliminate the resonance condition, thereby reach the purpose of tracking harmonic elimination.
Description
Technical Field
The utility model relates to a voltage transformer field, more specifically relates to a trail harmonic elimination device.
Background
The system below 35kV in China mostly adopts a power supply neutral point ungrounded operation mode, a primary winding of an electromagnetic voltage transformer on a bus becomes a unique metal channel of a neutral point ungrounded power grid to the ground, and a charging and discharging path of the power grid relative to the ground capacitor is bound to pass through the primary winding of the voltage transformer. When the system is earthed in a single phase, a capacitance current flows through a fault point, the voltage of a healthy phase rises to a line voltage level, and the ground capacitance is charged with the charge corresponding to the line voltage. Once the ground fault disappears, the current path is cut off and the non-grounded phase must be momentarily restored from the line voltage to the normal phase voltage level. However, since the ground fault is disconnected, the non-grounded phase is charged to the charge under the line voltage during the grounding period, and only through the high-voltage winding of the voltage transformer, the non-grounded phase enters the ground through the originally grounded neutral point, and the inrush current with the amplitude of several amperes can appear in the primary winding of the voltage transformer, so that the high-voltage fuse of the voltage transformer is fused. In the transient process, a low-frequency saturated current with very high amplitude flows through a high-voltage winding of the voltage transformer, so that an iron core of the voltage transformer is seriously saturated, the excitation inductance of the saturated voltage transformer is reduced, the resistance of a system network to ground tends to be inductive, and at the moment, if the inductance to ground of the system network is matched with the capacitance to ground, a three-phase or single-phase resonance loop is formed, so that various ferromagnetic resonance overvoltage can be excited, and the transformer is burnt down seriously. The existing common method is to add a microcomputer resonance elimination device on an opening triangle of a voltage transformer.
The existing microcomputer resonance elimination device acquires data and analyzes harmonic components and amplitudes, and the intermittent short circuit opening triangle absorbs resonance energy to eliminate ferromagnetic resonance, so that hysteresis is caused in the aspect of eliminating resonance, and the voltage transformer winding is easy to overload and can be damaged after being used alone for a long time.
Secondly, the microcomputer resonance elimination device takes a voltage-sensitive element as a core device, and when the mutual inductor normally operates, the impedance of the voltage-sensitive resistor is extremely high, so that the measurement precision of the mutual inductor is influenced, and the performance of the comprehensive protection device and the like is adversely affected. When the arc grounding short circuit lasts for a long time, the thermal capacity of the piezoresistor is difficult to meet the heat dissipation requirement, thermal breakdown can occur, and potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes above-mentioned prior art is not enough, provides a trail harmonic elimination device. The utility model discloses a track the triangular magnitude of voltage of mutual-inductor opening, the resistance of dynamic change harmonic elimination resistance for harmonic elimination resistance power and mutual-inductor winding power phase-match eliminate the resonance condition, thereby reach the purpose of tracking harmonic elimination.
In order to solve the technical problem, the technical scheme of the utility model as follows:
a tracking resonance elimination device is used for solving the resonance problem of a voltage transformer and comprises a micro-processing module, a first signal acquisition module, a signal processing circuit and a resonance elimination resistance matrix, wherein,
the first signal acquisition module is used for acquiring open triangular loop voltage of the mutual inductor and is electrically connected with the signal processing circuit;
the signal processing circuit is used for processing the signals acquired by the first signal acquisition module and is electrically connected with the micro-processing module;
the micro-processing module analyzes and calculates according to the signal transmitted by the signal processing circuit, controls the resistance value of the resonance elimination resistance matrix, and is electrically connected with the resonance elimination resistance matrix;
the resonance elimination resistance matrix is electrically connected with the voltage transformer.
The utility model discloses a working process:
the first signal acquisition module acquires the open triangular loop voltage of the transformer, the open triangular loop voltage is processed by the signal processing circuit and then transmitted to the micro-processing module, the micro-processing module analyzes and calculates according to the signal transmitted by the signal processing circuit, and the resistance value of the resonance elimination resistance matrix is controlled, so that the resonance elimination resistance power is matched with the winding power of the voltage transformer, resonance conditions are eliminated, and the purpose of tracking resonance elimination is achieved.
In a preferred embodiment, the detuning resistor matrix comprises N resistors and N +1 relays, where N is a positive integer greater than 1, and wherein,
the N resistors are sequentially connected in series to form a series resistor, and the series resistor is electrically connected with the voltage transformer to form a resonance elimination resistor loop;
the N +1 relays are defined as a total relay and N resonance elimination resistance relays, and the total relay is used for opening/closing a resonance elimination resistance loop; the N resonance elimination resistance relays are respectively in one-to-one correspondence with the N resistors, and each resonance elimination resistance relay controls the on/off of one resistor, so that the resistance value of the whole series resistor is influenced.
In the preferred scheme, the main relay can rapidly cut off the resistance loop and give an alarm under the working conditions that the open triangular loop of the voltage transformer has overlarge current, the system is grounded in a single phase and the like, and the harmonic elimination resistance is not suitable for being put into the main relay.
In a preferred embodiment, N ═ 5 is used.
In a preferred embodiment, the open-delta loop voltage value of the transformer and the resistance value of the series resistor in the resonance elimination resistor loop have the following relationship:
| open delta voltage | Ud≤10V | 10V＜Ud≤30V | 30＜Ud≤50V | 50＜Ud≤70V | U＞70V |
| Series resistance value | 60Ω | 90Ω | 100Ω | 110Ω | 140Ω |
And the Ud represents the voltage value of the open triangular loop of the transformer.
In a preferred scheme, the tracking resonance elimination device further comprises a signal isolation circuit, the signal isolation circuit is electrically connected with the first signal acquisition module, the signal isolation circuit is electrically connected with the second signal acquisition module, and the signal isolation circuit is electrically connected with the signal processing circuit.
In a preferred embodiment, the microprocessor module comprises a first microprocessor chip and a second microprocessor chip, wherein,
the first micro-processing chip is responsible for operation work and is electrically connected with the signal processing circuit;
the second micro-processing chip performs control work according to the operation result of the first micro-processing chip, and is electrically connected with the first micro-processing chip; the second micro-processing chip is electrically connected with the resonance elimination resistor matrix.
In a preferred scheme, the tracking resonance elimination device further comprises a second signal acquisition module, the second signal acquisition module is used for acquiring the three-phase voltage of the voltage transformer, and the second signal acquisition module is electrically connected with the signal processing circuit.
In a preferred scheme, the tracking resonance elimination device further comprises an alarm module, and the alarm module is electrically connected with the micro-processing module.
In a preferred scheme, the tracking and resonance elimination device further comprises a display module, and the display module is electrically connected with the micro-processing module.
In a preferred scheme, the tracking resonance elimination device further comprises a key module, and the key module is electrically connected with the micro-processing module.
In a preferred scheme, the tracking resonance elimination device further comprises a wireless communication module, and the wireless communication module is electrically connected with the micro-processing module.
Compared with the prior art, the utility model discloses technical scheme's beneficial effect is:
1. by tracking the open triangular voltage of the voltage transformer in real time and dynamically adjusting the resistance value of the resonance elimination resistor, the resonance condition formed by the transformer is broken, and the resonance phenomenon is thoroughly eliminated;
2. the harmonic elimination resistor is matched with the dynamic power of the voltage transformer winding, and the long-term use of the harmonic elimination resistor has no influence on the service life of the transformer;
3. under the working conditions that the open triangular loop of the voltage transformer has overlarge current, the system is grounded in a single phase and the like, and the harmonic elimination resistor is not suitable to be put into the voltage transformer, the resistance loop can be cut off rapidly, and an alarm is given.
Drawings
FIG. 1 is a block diagram of an embodiment.
Fig. 2 is a block diagram of a detuning resistance matrix of an embodiment.
FIG. 3 is a signal isolation circuit diagram of an embodiment;
fig. 4 is a circuit diagram of a signal processing circuit according to an embodiment.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.
Examples
As shown in fig. 1, a tracking resonance elimination device comprises an STM32F407VGT6 chip, a TMS320F28377DPTPT chip, a first signal acquisition module, a signal isolation circuit, a signal processing circuit, a resonance elimination resistor matrix, a second signal acquisition module, a KS12864-7920 display module and a TD321D485H communication module, wherein,
the signal isolation circuit is shown in fig. 3, and the signal processing circuit is shown in fig. 4;
the first signal acquisition module is used for acquiring open triangular loop voltage of the mutual inductor and is electrically connected with the signal isolation circuit;
the second signal acquisition module is used for acquiring the three-phase voltage of the voltage transformer and is electrically connected with the signal isolation circuit;
the signal isolation circuit is electrically connected with the signal processing circuit;
the signal processing circuit is electrically connected with the TMS320F28377DPTPT chip;
the TMS320F28377DPTPT chip is electrically connected with the STM32F407VGT6 chip;
the resonance elimination resistance matrix is electrically connected with the STM32F407VGT6 chip;
the KS12864-7920 display module is electrically connected with the STM32F407VGT6 chip;
the TD321D485H communication module is electrically connected with the STM32F407VGT6 chip.
Wherein the detuning resistor matrix comprises 5 resistors and 6 relays, as shown in fig. 2, wherein,
the 5 resistors are sequentially connected in series to form a resonance elimination resistor, and the resonance elimination resistor is electrically connected with the voltage transformer to form a resonance elimination resistor loop;
6 relays are defined as a main relay and 5 resonance elimination resistance relays, and the main relay is used for opening/closing a resonance elimination resistance loop; the 5 resonance elimination resistance relays are respectively in one-to-one correspondence with the 5 resistors, and each resonance elimination resistance relay controls the on/off of one resistor, so that the resistance value of the whole series resistor is influenced;
the open triangular loop voltage value of the mutual inductor and the resistance value of the series resistor in the resonance elimination resistance loop have the following relationship:
| open delta voltage | Ud≤10V | 10V＜Ud≤30V | 30＜Ud≤50V | 50＜Ud≤70V | U＞70V |
| Series resistance value | 60Ω | 90Ω | 100Ω | 110Ω | 140Ω |
And the Ud represents the voltage value of the open triangular loop of the transformer.
The working process of the embodiment:
the first signal acquisition module acquires open triangular loop voltage of a transformer, the open triangular loop voltage is transmitted to the TMS320F28377DPTPT chip for signal processing after being processed by the signal processing circuit, the TMS320F28377DPTPT chip transmits an analysis result to the STM32F407VGT6 chip, the STM32F407VGT6 chip controls the disconnection/closing of 5 resonance elimination resistance relays according to the analysis result of the MS320F28377DPTPT chip, the control on the resistance value of a resonance elimination resistance matrix is indirectly realized, so that the resonance elimination resistance power is matched with the winding power of the voltage transformer, the resonance elimination condition is eliminated, and the tracking and resonance elimination purpose is achieved.
Secondly, if the first signal acquisition module acquires that the open-delta loop current of the voltage transformer is larger than 1.5A, which indicates that the system does not meet the working condition of the embodiment, the STM32F407VGT6 chip quickly disconnects the main relay to cut off the resonance elimination resistance loop, and meanwhile, fault alarm is performed through the TD321D485H communication module.
Meanwhile, if the second signal acquisition module acquires that the three-phase voltage of the voltage transformer meets the single-phase grounding condition, the harmonic elimination resistor is not suitable for being put into use, the STM32F407VGT6 chip quickly disconnects the main relay to cut off a harmonic elimination resistor loop, and meanwhile, fault alarm is carried out through the TD321D485H communication module.
The beneficial effects of this embodiment:
1. by tracking the open triangular voltage of the voltage transformer in real time and dynamically adjusting the resistance value of the resonance elimination resistor, the resonance condition formed by the transformer is broken, and the resonance phenomenon is thoroughly eliminated;
2. the harmonic elimination resistor is matched with the dynamic power of the voltage transformer winding, and the long-term use of the harmonic elimination resistor has no influence on the service life of the transformer;
3. under the working conditions that the open triangular loop of the voltage transformer has overlarge current, the system is grounded in a single phase and the like, and the harmonic elimination resistor is not suitable to be put into the voltage transformer, the resistance loop can be cut off rapidly, and an alarm is given.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. For example, the model and circuit diagram of each module chip in the embodiments are only used as one example of this patent, and are not limited to this patent, and in fact, this patent may also implement the technical solution through other circuit diagrams and other models of chips, so as to achieve the technical effect.
Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A tracking resonance elimination device is used for solving the resonance problem of a voltage transformer and is characterized by comprising a micro-processing module, a first signal acquisition module, a signal processing circuit and a resonance elimination resistance matrix, wherein,
the first signal acquisition module is used for acquiring open triangular loop voltage of the mutual inductor and is electrically connected with the signal processing circuit;
the signal processing circuit is used for processing the signals acquired by the first signal acquisition module and is electrically connected with the micro-processing module;
the micro-processing module analyzes and calculates according to the signal transmitted by the signal processing circuit, controls the resistance value of the resonance elimination resistance matrix, and is electrically connected with the resonance elimination resistance matrix;
the resonance elimination resistance matrix is electrically connected with the voltage transformer.
2. The tracking detuning device according to claim 1, wherein said detuning resistor matrix comprises N resistors and N +1 relays, said N being a positive integer greater than 1, wherein,
the N resistors are sequentially connected in series to form a series resistor, and the series resistor is electrically connected with the voltage transformer to form a resonance elimination resistor loop;
the N +1 relays are defined as a total relay and N resonance elimination resistance relays, and the total relay is used for opening/closing a resonance elimination resistance loop; the N resonance elimination resistance relays are respectively in one-to-one correspondence with the N resistors, and each resonance elimination resistance relay controls the on/off of one resistor, so that the resistance value of the whole series resistor is influenced.
3. The tracking resonance elimination device according to claim 2, wherein N-5, and the open-delta loop voltage value of the transformer and the resistance value of the series resistor in the resonance elimination resistance loop have the following relationship:
And the Ud represents the voltage value of the open triangular loop of the transformer.
4. The tracking detuning device according to claim 1, further comprising a signal isolation circuit electrically connected to the first signal collecting module, the signal isolation circuit electrically connected to the second signal collecting module, and the signal isolation circuit electrically connected to the signal processing circuit.
5. The tracking detuning device according to any of the claims 1 to 4, wherein the microprocessor module comprises a first microprocessor chip and a second microprocessor chip, wherein,
the first micro-processing chip is responsible for operation work and is electrically connected with the signal processing circuit;
the second micro-processing chip performs control work according to the operation result of the first micro-processing chip, and is electrically connected with the first micro-processing chip; the second micro-processing chip is electrically connected with the resonance elimination resistor matrix.
6. The tracking resonance elimination device according to claim 5, further comprising a second signal acquisition module, wherein the second signal acquisition module is used for acquiring the three-phase voltage of the voltage transformer, and the second signal acquisition module is electrically connected with the signal processing circuit.
7. The tracking resonance elimination device according to claim 6, further comprising an alarm module, wherein said alarm module is electrically connected to said microprocessor module.
8. The tracking resonance elimination device according to claim 1, 2, 3, 4, 6 or 7, wherein said tracking resonance elimination device further comprises a display module, said display module being electrically connected to said microprocessor module.
9. The tracking resonance elimination device of claim 8 further comprising a key module, said key module being electrically connected to said microprocessor module.
10. The tracking detuning device according to claim 1, 2, 3, 4, 6, 7, or 9, further comprising a wireless communication module electrically connected to the microprocessor module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921601806.0U CN210744725U (en) | 2019-09-24 | 2019-09-24 | Tracking resonance elimination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921601806.0U CN210744725U (en) | 2019-09-24 | 2019-09-24 | Tracking resonance elimination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210744725U true CN210744725U (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921601806.0U Expired - Fee Related CN210744725U (en) | 2019-09-24 | 2019-09-24 | Tracking resonance elimination device |
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| CN (1) | CN210744725U (en) |
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- 2019-09-24 CN CN201921601806.0U patent/CN210744725U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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Granted publication date: 20200612 Termination date: 20200924 |