CN210665866U - Data transmission alarm device for transformer core multipoint grounding monitoring - Google Patents
Data transmission alarm device for transformer core multipoint grounding monitoring Download PDFInfo
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- CN210665866U CN210665866U CN201921312771.9U CN201921312771U CN210665866U CN 210665866 U CN210665866 U CN 210665866U CN 201921312771 U CN201921312771 U CN 201921312771U CN 210665866 U CN210665866 U CN 210665866U
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Abstract
The utility model discloses a data transmission alarm device for monitoring transformer core multiple spot ground connection, including MCU treater, signal conditioning unit, signal acquisition unit, ADC converting unit and data transmission unit, signal acquisition unit input termination signal end that awaits measuring, output pass through signal conditioning unit connection ADC converting unit, and ADC converting unit connects the MCU treater, and the MCU treater passes through the data transmission unit and connects the host computer, the utility model discloses structural design is novel, can realize the real-time supervision and the malfunction alerting of equipment state.
Description
Technical Field
The utility model relates to an on-line monitoring technical field specifically is a data transmission alarm device for monitoring of transformer core multiple spot ground connection.
Background
The transformer is one of key devices of a power transmission and transformation system, is responsible for power exchange and the junction function of interconnecting a plurality of voltage-class power grids, directly influences the reliability and safety of a power system in the operation state, and once the transformer fails to work and causes power failure, huge economic loss and social influence are caused. However, the current means for detecting the grounding current of the transformer core by the substation operating personnel mainly adopts a pincerlike ammeter to measure the current of the grounding outgoing line of the transformer core, which not only wastes manpower and material resources, but also is difficult to realize periodic measurement for part of unattended substations and find potential safety hazards of electrical equipment of the substations in time.
In the operation process of the transformer, an uneven electric field is formed between the electrified winding and the lead thereof and the oil tank, parasitic capacitors exist among the high-voltage winding, the low-voltage winding, the iron core, the clamping piece and the ground oil tank of the transformer, the electrified winding enables the iron core and the clamping piece to generate certain suspension potential through the coupling effect of the parasitic capacitors, and when the potential difference between the two points reaches the value capable of breaking down the insulation between the two points, spark discharge is generated to decompose the oil of the transformer and destroy the insulation of the transformer. Therefore, the metal components such as the transformer core and the clip must be reliably grounded and only a little grounded, so as to short-circuit the parasitic capacitance between the core and the clip and the ground and make them at zero potential.
If the iron core and the clamping piece are grounded at more than two points for some reason, a loop is formed between the grounding points, leakage magnetic flux of the transformer links the closed loop, circulation current is generated on the grounding wire, and when the circulation current is too large, the accident that the local overheating in the transformer is caused, and the insulation oil is decomposed is caused. Therefore, the multipoint ground fault of the transformer iron core and the clamping piece can be accurately and timely analyzed and processed, and the method has great significance for ensuring the safe operation of the transformer.
The manual detection method has multiple steps, is complex in operation, cannot be analyzed on line, and has problems in detection precision and timeliness under the interference of a strong electromagnetic environment on site.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a data transmission alarm device for transformer core multiple spot ground connection monitoring to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a data transmission alarm device for transformer core multiple spot ground connection monitoring, includes MCU treater, signal conditioning unit, signal acquisition unit, ADC converting unit and data transmission unit, signal acquisition unit input termination signal end that awaits measuring, output pass through signal conditioning unit and connect ADC converting unit, the MCU treater is connected to ADC converting unit, the MCU treater passes through the data transmission unit and connects the host computer, signal acquisition unit includes current sensor and voltage sensor, still includes the audible and visual alarm unit, the MCU treater is connected to the audible and visual alarm unit.
Preferably, the ADC conversion unit includes a first ADC chip, a second ADC chip, an analog signal input unit, a clock distribution unit and a power monitoring and management unit, the analog signal input unit is connected with the first ADC chip and the second ADC chip respectively, the clock distribution unit is connected with the first ADC chip and the second ADC chip respectively, the first ADC chip and the second ADC chip are connected with the processing unit respectively, and the processing unit is connected with the power monitoring and management unit.
Preferably, the data transmission unit comprises a first ZigBee wireless transceiver unit, a second ZigBee wireless transceiver unit, and an RS232 interface circuit, the first ZigBee wireless transceiver unit is in signal connection with the second ZigBee wireless transceiver unit, and the second ZigBee wireless transceiver unit is connected with the RS232 interface circuit.
Preferably, the MCU processor adopts a single chip microcomputer PIC18F87K 22.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses structural design is novel, has the on-line measuring process, and the wiring is simple, avoids the detection difficulty that artifical detection transformer core ground current caused, and it is low to detect the precision, and periodicity is poor, and the step is numerous and diverse, and the operation is complicated, realizes difficult scheduling problem.
(2) The utility model discloses an electric signal acquisition unit is applicable to the signal acquisition of transformer leakage current, also can do information acquisition to the leakage current of other electrical equipment, end screen currents such as the leakage current of capacitive transformer, coupling capacitor group, arrester.
(3) The utility model discloses a data transmission unit realizes the wireless data receiving and dispatching of field device to the master control room, saves the cost of wired data mode. And the device has a device failure alarm function, and realizes real-time monitoring of the device state.
(4) The utility model discloses have the change trend prediction function of equipment ground current, can realize the state change trend of equipment abnormal operation.
(5) The utility model discloses a host computer adopts many interfaces management mode, has on-the-spot HMI screen display unit, when appearing the unstable transmission error even of data transmission, does not influence the acquisition that the on-the-spot realized original data.
Drawings
FIG. 1 is a block diagram illustrating the structure of the present invention;
FIG. 2 is a schematic block diagram of an ADC conversion unit according to the present invention;
fig. 3 is a schematic block diagram of the data transmission unit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: a data transmission alarm device for multipoint grounding monitoring of a transformer core comprises an MCU (microprogrammed control Unit) processor 1, a signal conditioning unit 2, an electric signal acquisition unit 3, an ADC (analog to digital converter) conversion unit 4 and a data transmission unit 5, wherein the input end of the electric signal acquisition unit 3 is connected with a signal end 6 to be detected, the output end of the electric signal acquisition unit is connected with the ADC conversion unit 4 through the signal conditioning unit 2, the ADC conversion unit 4 is connected with the MCU processor 1, the MCU processor 1 is connected with an upper computer 7 through the data transmission unit 5, the electric signal acquisition unit 3 comprises a current sensor 8 and a voltage sensor 9 and further comprises an acousto-optic alarm unit 10, and the acousto-optic alarm unit 10 is connected with; the utility model discloses an electric signal acquisition unit is applicable to the signal acquisition of transformer leakage current, also can do information acquisition to the leakage current of other electrical equipment, end screen currents such as the leakage current of capacitive transformer, coupling capacitor group, arrester. Wherein, the MCU processor 1 adopts a singlechip as PIC18F87K 22.
The utility model discloses in, ADC conversion unit 4 includes first ADC chip 11, second ADC chip 12, analog signal input unit 13, clock distribution unit 14 and power monitoring and administrative unit 15, first ADC chip 11 and second ADC chip 12 are connected respectively to analog signal input unit 13, first ADC chip 11 and second ADC chip 12 are connected respectively to clock distribution unit 14, processing unit 16 is connected respectively to first ADC chip 11 and second ADC chip 12, processing unit 16 connects power monitoring and administrative unit 15.
Furthermore, the utility model discloses in, data transmission unit 5 includes first zigBee wireless transceiver unit 17, the zigBee wireless transceiver unit 18 of second and RS232 interface circuit 19, the first zigBee wireless transceiver unit 17 signal connection second zigBee wireless transceiver unit 18, RS232 interface circuit 19 is connected to second zigBee wireless transceiver unit 18. The field personnel contact the power transformer of the transformer substation for a long time and in a short distance, the electromagnetic environment is strong, the radiation may harm human health and the design requirements of a plurality of detection points of the system are considered, and the data transmission unit is used for transmitting the communication in a self-networking ZigBee low-power wireless data transmission module mode. The utility model discloses a built-in chip of zigBee agreement low-power wireless data transmission module be CC 2430. The CC2430 low-speed communication has low error rate, the transmission distance can reach one kilometer under the line-of-sight, sixteen channels are provided, reliable channels can be automatically selected according to the environment for communication, and the requirements of complex production environments on site can be well met. In addition, the circuit has fewer peripheral circuits, low failure rate, high reliability and strong anti-interference capability. The utility model discloses a data transmission unit realizes the wireless data receiving and dispatching of field device to the master control room, saves the cost of wired data mode. And the device has a device failure alarm function, and realizes real-time monitoring of the device state.
The working principle is as follows: the current collected by the electric signal collection unit is amplified, filtered and lifted by the signal conditioning circuit to be converted into a voltage signal, the voltage signal is accessed to an IO port of the integrated ADC conversion unit, the MCU processor calculates and processes the converted digital signal, then the digital signal is displayed by an LCD (liquid crystal display) screen of the upper computer to measure data, meanwhile, the action of the acousto-optic alarm module is controlled according to the comparison with the upper and lower current limit SET (SET event) values SET by field personnel by using entity keys, and if the current is within the limited range of 0-100mA, the acousto-optic alarm module is controlled to keep silent; if the alarm signal is sent out by controlling the action of the sound-light alarm module; if the microcontroller of the single chip microcomputer judges that the transformer core has no multipoint ground fault according to the detection value, the LCD screen displays the state of the grounding end to be normal; if the multi-point grounding fault of the transformer iron core is detected, the liquid crystal display screen displays that the grounding end is abnormal.
To sum up, the utility model discloses structural design is novel, has the on-line measuring process, and the wiring is simple, avoids the detection difficulty that artifical detection transformer core ground current caused, and it is low to detect the precision, and periodicity is poor, and the step is numerous and diverse, and the operation is complicated, realizes difficult scheduling problem.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a data transmission alarm device for transformer core multiple spot ground connection monitoring which characterized in that: including MCU treater (1), signal conditioning unit (2), signal of telecommunication collection unit (3), ADC converting unit (4) and data transmission unit (5), signal of telecommunication collection unit (3) input termination signal end (6) that awaits measuring, output pass through signal conditioning unit (2) and connect ADC converting unit (4), MCU treater (1) is connected in ADC converting unit (4), MCU treater (1) is through data transmission unit (5) connection host computer (7), signal of telecommunication collection unit (3) include current sensor (8) and voltage sensor (9), still include audible-visual alarm unit (10), MCU treater (1) is connected in audible-visual alarm unit (10).
2. The data transmission alarm device for the multipoint grounding monitoring of the transformer core according to claim 1, wherein: ADC converting unit (4) includes first ADC chip (11), second ADC chip (12), analog signal input unit (13), clock distribution unit (14) and power monitoring and management unit (15), first ADC chip (11) and second ADC chip (12) are connected respectively in analog signal input unit (13), first ADC chip (11) and second ADC chip (12) are connected respectively in clock distribution unit (14), processing unit (16) is connected respectively in first ADC chip (11) and second ADC chip (12), processing unit (16) connection power monitoring and management unit (15).
3. The data transmission alarm device for the multipoint grounding monitoring of the transformer core according to claim 1, wherein: the data transmission unit (5) comprises a first ZigBee wireless transceiver unit (17), a second ZigBee wireless transceiver unit (18) and an RS232 interface circuit (19), the first ZigBee wireless transceiver unit (17) is in signal connection with the second ZigBee wireless transceiver unit (18), and the second ZigBee wireless transceiver unit (18) is connected with the RS232 interface circuit (19).
4. The data transmission alarm device for the multipoint grounding monitoring of the transformer core according to claim 1, wherein: the MCU processor (1) adopts a single chip microcomputer PIC18F87K 22.
Priority Applications (1)
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CN201921312771.9U CN210665866U (en) | 2019-08-14 | 2019-08-14 | Data transmission alarm device for transformer core multipoint grounding monitoring |
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CN201921312771.9U CN210665866U (en) | 2019-08-14 | 2019-08-14 | Data transmission alarm device for transformer core multipoint grounding monitoring |
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