A transformer contactless intelligent on-load voltage regulation system and method based on high-voltage side voltage signal acquisition

Abstract

The present invention provides a transformer contactless intelligent on-load voltage regulation system and method based on high-voltage side voltage signal acquisition, the on-load voltage regulation system includes a transformer high-voltage side tap, a voltage acquisition unit, a voltage reduction unit, a signal conditioning unit, a central control unit, a control execution unit, a display unit, a storage unit and a key input unit; the on-load voltage regulation system collects the voltage between the transformer high-voltage side taps, and compares the voltage with a preset voltage range, controls the working state of the control execution unit in real time, and then controls the on and off of the transformer tap switch, changes the transformation ratio of the transformer, and achieves the purpose of on-load voltage regulation. The present invention provides a transformer contactless intelligent on-load voltage regulation system and method based on high-voltage side voltage signal acquisition, which ensures that the transformer output voltage does not change with the grid voltage, and ensures the stability of the output voltage.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power equipment, and in particular relates to a transformer contactless intelligent on-load voltage regulation system and method based on high-voltage side voltage signal acquisition. Background Art

[0002] With the continuous development of science and technology, there are more and more electrical equipment and the diversification of loads has led to fluctuations in system voltage. Generally, power transformer on-load voltage regulation technology is used to stabilize the output voltage.

[0003] At present, the on-load voltage regulation technology of power transformers all samples from the low-voltage side of the transformer, the tap changer is on the high-voltage side of the transformer, and the control system is also controlled on the low-voltage side. However, when a single-phase grounding fault occurs on the high-voltage side of the transformer or there is a lightning intrusion wave, the voltage regulation control system part and the tap changer will be subjected to a very high voltage, which may easily cause damage to the equipment. To solve this problem, the present invention proposes a solution of taking voltage from the high-voltage side of the transformer, and adopts a contactless tap changer. The working mode of the tap changer is controlled according to the collected voltage signal to ensure that the output voltage does not change with the grid voltage, thereby ensuring the stability of the output voltage. Summary of the invention

[0004] The present invention provides a transformer contactless intelligent on-load voltage regulation system and method based on high-voltage side voltage signal acquisition, which ensures that the transformer output voltage does not change with the grid voltage and ensures the stability of the output voltage.

[0005] The present invention specifically relates to a transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition. The on-load voltage regulation system comprises a transformer high-voltage side tap, a voltage acquisition unit, a step-down unit, a signal conditioning unit, a central control unit, a control execution unit, a display unit, a storage unit and a key input unit. The transformer high-voltage side tap is connected in a ring with the voltage acquisition unit, the step-down unit, the signal conditioning unit, the central control unit and the control execution unit. The central control unit is also connected to the display unit, the storage unit and the key input unit respectively. The on-load voltage regulation system acquires the voltage between the transformer high-voltage side taps and compares the voltage with a preset voltage range, controls the working state of the control execution unit in real time, and further controls the on and off of the transformer tap switch, changes the transformation ratio of the transformer, and achieves the purpose of on-load voltage regulation.

[0006] The key input unit cooperates with the storage unit and the display unit to complete the setting of relevant parameters.

[0007] The transformer tap switch adopts anti-parallel thyristor, and each phase of the three-phase winding coils A, B, and C on the high-voltage side leads to three taps, respectively, the first gear 105% UN 1st gear, 2nd gear U N 1st and 3rd gear 95% U N The voltage acquisition unit is connected to the first and second taps of the A-phase winding on the high-voltage side of the transformer; the control execution unit is controlled by the central control unit, and includes a relay and an AC contactor, and the AC contactor coil is connected in series with the normally open contact of the relay; the tap of the first gear is connected to the tap switch through the first fuse, the first normally open contact of the AC contactor, and the tap of the second gear is connected to the tap switch through the second fuse, and the tap of the third gear is connected to the tap switch through the third fuse, the second normally open contact of the AC contactor and the tap switch.

[0008] The step-down unit adopts an isolated step-down transformer to step down and output an AC voltage of 8V.

[0009] The signal conditioning unit comprises a rectifying module, a filtering module, a voltage dividing and limiting module and an A / D conversion module, performs rectification, filtering, voltage dividing and limiting and A / D conversion processing on input information, and outputs a DC voltage signal.

[0010] The present invention also provides a voltage regulation method of a transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition, the voltage regulation method comprising the following steps:

[0011] Step (1): power on, the transformer tap operates at the second gear;

[0012] Step (2): the voltage acquisition unit acquires the voltage between the first and second taps of the A-phase winding on the high-voltage side of the transformer, and inputs the voltage into the step-down unit;

[0013] Step (3): the voltage reduction unit reduces the voltage of the input voltage signal and outputs an 8V AC voltage to the signal conditioning unit;

[0014] Step (4): the signal conditioning unit performs rectification, filtering, voltage division and amplitude limiting and A / D conversion processing on the input information, and outputs a DC voltage signal to the central control unit;

[0015] Step (5): The central control unit compares the input voltage signal with a preset voltage range, and sends a control signal in real time to control the working state of the relay. If the measured voltage range is within the preset voltage range, the relay does not operate and does not change the transformer working tap. If the measured voltage range is not within the preset voltage range, the relay operates and changes the transformer working tap. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1The present invention is a structural schematic diagram of a transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition. DETAILED DESCRIPTION

[0017] The following is a detailed description of a specific implementation of a transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition according to the present invention in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, the on-load voltage regulation system of the present invention includes a transformer high-voltage side tap, a voltage acquisition unit, a step-down unit, a signal conditioning unit, a central control unit, a control execution unit, a display unit, a storage unit and a key input unit. The transformer high-voltage side tap is connected to the voltage acquisition unit, the step-down unit, the signal conditioning unit, the central control unit and the control execution unit in a ring shape. The central control unit is also connected to the display unit, the storage unit and the key input unit respectively. The on-load voltage regulation system collects the voltage between the transformer high-voltage side taps and compares the voltage with a preset voltage range to control the working state of the control execution unit in real time, thereby controlling the on and off of the transformer tap switch, changing the transformation ratio of the transformer, and achieving the purpose of on-load voltage regulation.

[0019] The key input unit cooperates with the storage unit and the display unit to complete the setting of relevant parameters.

[0020] The transformer tap switch adopts anti-parallel thyristor, and each phase of the three-phase winding coils A, B, and C on the high-voltage side leads to three taps, respectively, the first gear 105% U N 1st gear, 2nd gear U N 1st and 3rd gear 95% U N The voltage acquisition unit is connected to the first and second taps of the A-phase winding on the high-voltage side of the transformer; the control execution unit is controlled by the central control unit, and includes a relay and an AC contactor, and the AC contactor coil is connected in series with the normally open contact of the relay; the tap of the first gear is connected to the tap switch through the first fuse, the first normally open contact of the AC contactor, and the tap of the second gear is connected to the tap switch through the second fuse, and the tap of the third gear is connected to the tap switch through the third fuse, the second normally open contact of the AC contactor and the tap switch.

[0021] The step-down unit adopts an isolated step-down transformer to step down and output an AC voltage of 8V.

[0022] The signal conditioning unit comprises a rectifying module, a filtering module, a voltage dividing and limiting module and an A / D conversion module, performs rectification, filtering, voltage dividing and limiting and A / D conversion processing on input information, and outputs a DC voltage signal.

[0023] The present invention also provides a voltage regulation method of a transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition, the voltage regulation method comprising the following steps:

[0024] Step (1): power on, the transformer tap operates at the second gear;

[0025] Step (2): the voltage acquisition unit acquires the voltage between the first and second taps of the A-phase winding on the high-voltage side of the transformer, and inputs the voltage into the step-down unit;

[0026] Step (3): the voltage reduction unit reduces the voltage of the input voltage signal and outputs an 8V AC voltage to the signal conditioning unit;

[0027] Step (4): the signal conditioning unit performs rectification, filtering, voltage division and amplitude limiting and A / D conversion processing on the input information, and outputs a DC voltage signal to the central control unit;

[0028] Step (5): The central control unit compares the input voltage signal with a preset voltage range, and sends a control signal in real time to control the working state of the relay. If the measured voltage range is within the preset voltage range, the relay does not operate and does not change the transformer working tap. If the measured voltage range is not within the preset voltage range, the relay operates and changes the transformer working tap.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. A person skilled in the art should understand that the specific implementation of the present invention can be modified or replaced by equivalents, but these modifications or changes are within the scope of protection of the pending claims.

Claims

1. A transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition, characterized in that: The on-load voltage regulation system comprises a transformer high-voltage side tap, a voltage acquisition unit, a step-down unit, a signal conditioning unit, a central control unit, a control execution unit, a display unit, a storage unit and a key input unit. The transformer high-voltage side tap is connected in a ring shape with the voltage acquisition unit, the step-down unit, the signal conditioning unit, the central control unit and the control execution unit. The central control unit is also connected to the display unit, the storage unit and the key input unit respectively. The on-load voltage regulation system collects the voltage between the transformer high-voltage side taps and compares the voltage with a preset voltage range to control the working state of the control execution unit in real time, thereby controlling the on and off of the transformer tap switch, changing the transformation ratio of the transformer and achieving the purpose of on-load voltage regulation. The transformer tap switch adopts anti-parallel thyristor, and each phase of the three-phase winding coils A, B, and C on the high-voltage side leads to three taps, which are respectively 105% in the first gear and 105% in the second gear. 1st gear, 2nd gear 1st and 3rd gear 95% The voltage acquisition unit is connected to the first and second taps of the A-phase winding on the high-voltage side of the transformer; the control execution unit is controlled by the central control unit and includes a relay and an AC contactor, and the AC contactor coil is connected in series with the normally open contact of the relay; the tap of the first gear is connected to the tap switch through the first fuse, the first normally open contact of the AC contactor, and the tap of the second gear is connected to the tap switch through the second fuse, and the tap of the third gear is connected to the tap switch through the third fuse, the second normally open contact of the AC contactor and the tap switch; The voltage regulation method of the on-load voltage regulation system comprises the following steps: Step (1): Power on, and the transformer tap operates at the second gear; Step (2): the voltage acquisition unit acquires the voltage between the first and second taps of the A-phase winding on the high-voltage side of the transformer, and inputs the voltage into the step-down unit; Step (3): the step-down unit steps down the input voltage signal and outputs an 8V AC voltage to the signal conditioning unit; Step (4): the signal conditioning unit performs rectification, filtering, voltage division and amplitude limiting and A / D conversion processing on the input information, and outputs a DC voltage signal to the central control unit; Step (5): the central control unit compares the input voltage signal with the preset voltage range, and sends a control signal in real time to control the working state of the relay. If the measured voltage range is within the preset voltage range, the relay does not operate and does not change the transformer working tap. If the measured voltage range is not within the preset voltage range, the relay operates and changes the transformer working tap.

2. According to claim 1, a transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition is characterized in that: The key input unit cooperates with the storage unit and the display unit to complete the setting of relevant parameters.

3. According to claim 2, a transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition is characterized in that: The step-down unit adopts an isolated step-down transformer to step down and output an AC voltage of 8V.

4. According to claim 3, a transformer contactless intelligent on-load voltage regulation system based on high-voltage side voltage signal acquisition is characterized in that: The signal conditioning unit comprises a rectifying module, a filtering module, a voltage dividing and limiting module and an A / D conversion module, performs rectification, filtering, voltage dividing and limiting and A / D conversion processing on input information, and outputs a DC voltage signal.

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