CN201765285U - Device of monitoring real time wastage and load of transformer in operation - Google Patents

Abstract

The utility model belongs to a transformer parameter monitoring device, and relates to a device of monitoring real time wastage and load of a transformer in operation. The device is composed of a monitoring circuit board and a human-machine interactive board, the monitoring circuit board is also provided with an RS485 serial bus interface and a CAN industrial field bus interface that can be networked with a background monitoring software; the monitoring circuit board is provided with a transformer operation parameter detection module and a transformer temperature monitoring module connected with each other through an RS232 serial bus, an input end of the transformer operation parameter detection module is connected to a low-voltage side of a transformer through a low-voltage side parameter collection circuit, an input end of the transformer temperature monitoring module is connected to the transformer through a temperature collection circuit, and an output end of the transformer temperature monitoring module is connected to a wind turbine through a wind turbine control circuit. The device has beneficial effects of non halt of normal operation of the transformer, non collection of working parameter of the transformer on a high-voltage side, and real time temperature collection and control function of the transformer.

Description

Real-time loss of a kind of transformer in service and load monitoring device

Technical field

The utility model belongs to general power transformer parameter monitor device, relate to real-time loss of a kind of transformer in service and load monitoring device, can not stop to realize real-time loss of transformer in service and load monitoring under the condition that transformer normally moved, need not to gather transformer high-voltage side running parameter.

Background technology

Power transformer is by means of electromagnetic induction, and with a kind of electrical equipment of identical frequency, conversion between two or more windings, exchange voltage and current, the loss of transformer is divided into open circuit loss and load loss.Open circuit loss be transformer under rated voltage, the loss that produces when causing the magnetic flux cyclical variation by exciting current in unshakable in one's determination, only relevant with the self-characteristic and the working voltage of transformer, the height with load does not change; Load loss is that transformer is when rated load operation, once, Secondary Winding flows through rated current, the loss that in winding, produces, comprise basic loss and added losses two parts, basic loss is the loss that winding D.C. resistance causes, equal electric current square with the product of direct current resistance, added losses comprise that the kelvin effect that causes owing to stray field makes the effective resistance of lead become the loss that increases greatly, multiple conducting wires and around the time the inside circulation loss, the eddy current loss that stray field produces at metal folder, oil tank wall place etc.; Load loss is not only relevant with the power transformer self-characteristic, and changes with the variation of power transformer load.

In the operation of modern electric equipment and safeguarding, power transformer not only belongs to the row of equipment most important and the most expensive in the electric system, and is to cause one of maximum equipment of power system accident.Along with electric system develops towards UHV (ultra-high voltage), high capacity direction, and society and the raising of life to the power supply reliability requirement, press for the power equipment running status is carried out in real time or on-line monitoring (monitoring in service) regularly, in time find the early stage insulation defect of electrical equipment, prevent that burst accident from taking place, simultaneously can reduce unnecessary interruption maintenance, the massive losses of avoiding traditional experiment that electrical equipment is caused owing to " excessively maintenance ", prolong the serviceable life of equipment effectively, overhaul of the equipments is reached distribute rationally.

Transformer be fail, most important equipment in the change, adapted electric system, it also is the electric equipment of energy loss maximum, for improving the work efficiency of transformer, energy-conservation of consumption reduction, State Council and relevant department issued the documents once and require transformer with high energy consumption is transformed, and the correlation parameter index of test transformer is the prerequisite of monitoring and transformation.But the test of consuming energy at the scene is very loaded down with trivial details work, and workload is big, and efficient is low.

The open circuit loss of transformer and load loss all were to test under non-operating state in the past, utilized the multilist method to come the loss and the capacity of measuring transformer mostly in early days, mainly were at present to adopt the transformer testing platform to test.

Transformer that newly dispatches from the factory and the transformer after the overhaul generally all will be done open circuit loss test and load test, open circuit loss test and load test must be carried out under rated frequency (sinusoidal waveform) and coil rating electric current, the general transformer first side winding side of selecting is the test winding, secondary side (big electric current side) man-made short-circuit, test must be carried out under the transformer non-operating state, and testing procedure is more loaded down with trivial details.In addition because on-the-spot actual conditions, be subjected to the restriction of condition, can't apply rated voltage to tested transformer with rated frequency, particularly to the test of big-and-middle-sized transformer, more be difficult at the scene accomplish, therefore utilize the low-voltage method to test earlier often, draw the zero load and the load loss value of ratings again by reckoning, thereby the confidence level of test result has just been beaten certain discount.

Power transformer is a high voltage electric equipment important in the electric system, undertaking the conversion of voltage, electric current and the task of power delivery, the quality of its performance directly affects the safe and stable operation of electric system, if can onlinely detect the variation of transformer efficiency loss, just can determine the order of severity of the whether normal and fault of Transformer Winding basically, this provides a very effective method to Winding in Power Transformer status monitoring and fault diagnosis, and is very meaningful to the accuracy rate that improves transformer fault diagnosis.

Because the needs of the online detection of power transformer, at present also beginning to have the method research of some online detection three-phase transformer open circuit losses, load loss, mainly is to realize (referring to Fig. 1) by the real-time amount of the former secondary voltage electric current of transformer is gathered computing.This method is by the working condition of digital processing technology analysis and record three-phase transformer, require to gather simultaneously the former limit of transformer (input side, be generally high pressure) and the voltage and current of secondary (outgoing side), must pay special attention to the synchronism of ten two road signals (three-phase voltage of former limit, secondary, electric current), sampling when needing to guarantee 12 passages, technology realizes and safety guarantee is had relatively high expectations.

The utility model content:

The utility model provides a kind of real-time loss of transformer in service and load monitoring device that transformer normally moves, need not to gather transformer high-voltage side running parameter that do not need to stop in order to remedy the deficiencies in the prior art.

The present invention is achieved through the following technical solutions:

Real-time loss of transformer in service of the present utility model and load monitoring device, its special character is: is made up of the supervisory circuit plate and the man-machine interaction plate that connect by the RS232 universal serial bus, the supervisory circuit plate also is provided with RS485 universal serial bus and the CAN industrial field bus interface that can network with background monitoring software; Wherein, the supervisory circuit plate is provided with by RS232 universal serial bus interconnective transformer operational parameter detection module and transformer monitoring temperature module, the input end of transformer operational parameter detection module connects step down side by low-pressure side parameter acquisition circuit, the input end of transformer monitoring temperature module connects transformer by temperature collection circuit, and the output terminal of transformer monitoring temperature module connects blower fan by draught fan control circuit; The man-machine interaction plate is provided with operation keyboard and LCD.

Real-time loss of transformer in service of the present utility model and load monitoring device, the CPU of transformer operational parameter detection module adopts the TMS320LF2812A chip.

Real-time loss of transformer in service of the present utility model and load monitoring device, the CPU of transformer monitoring temperature module adopts the TMS320LF2407A chip.

The difference of the utility model and system shown in Figure 1 is: system shown in Figure 1 must be gathered the voltage and current of former limit of transformer and secondary simultaneously, ten two road signals (three-phase voltage of former limit, secondary, electric current) must have good synchronism, sampling when needing to guarantee 12 passages, technology realizes and safety guarantee is had relatively high expectations.This monitoring device (Fig. 2) need not to gather running parameters such as the voltage, electric current of transformer high-voltage side, avoided the specific (special) requirements such as high security, high reliability of transformer high-voltage side parameter acquisition, thereby make that the mounting, commissioning and maintenance cost of this monitoring device is lower, correspondingly make the reliability of real-time loss of transformer and load monitoring be greatly improved.

The beneficial effects of the utility model are, the firstth, do not need to disconnect the input and output loop of transformer, in the transformer normal course of operation, can carry out continual monitoring to the zero load and the load loss of its reality, can in time find the insulation fault of transformer, prevent that burst accident from taking place, simultaneously can reduce unnecessary interruption maintenance, avoid traditional experiment that transformer " excessively maintenance " is caused damage, effectively improve the service efficiency of transformer, prolong the serviceable life of transformer, the operating monitoring result of transformer can show in real time on monitoring device or be sent to system's operations control center by industrial field bus carries out unified monitoring; The secondth, monitoring the time need not to gather running parameters such as the voltage, electric current of transformer high-voltage side, avoided the specific (special) requirements such as high security, high reliability of transformer high-voltage side parameter acquisition, thereby make that the mounting, commissioning and maintenance cost of this monitoring device is lower, correspondingly make the reliability of real-time loss of transformer and load monitoring be greatly improved; The 3rd is to possess collection of transformer real time temperature and control function, can reduce the actual motion loss of transformer by real-time temperature control, effectively improves the operational efficiency of transformer, reduces transformer work energy consumption.

This monitoring device software and hardware all adopts modular design, be convenient to installation, maintenance and system extension, monitoring device also has RS485 universal serial bus and CAN (controller area network network) industrial field bus interface, can network with background monitoring software easily, realize the Centralized Monitoring function of many transformers, can be widely used in the operational factor monitoring field of power transformer.In system design, incorporated digital signal processing (DSP) technology, intelligent sensing technology, intelligent control technology, localized network technology, disturbed isolation technology and control in real time, technology such as fault-tolerant, automatic trouble diagnosis, improved the processing capability in real time and the antijamming capability under abominable electromagnetic environment of monitoring device greatly.

Description of drawings

Fig. 1 is no-load transformer and the load loss monitoring system structural representation of realizing by former secondary parameter acquisition in the prior art.Fig. 2 is real-time loss of transformer in service and load monitoring device (the utility model) system architecture synoptic diagram.

Embodiment

Real-time loss of transformer in service of the present utility model and load monitoring device, its special character is: is made up of the supervisory circuit plate and the man-machine interaction plate that connect by the RS232 universal serial bus, the supervisory circuit plate also is provided with RS485 universal serial bus and the CAN industrial field bus interface that can network with background monitoring software; Wherein, the supervisory circuit plate is provided with by RS232 universal serial bus interconnective transformer operational parameter detection module and transformer monitoring temperature module, the input end of transformer operational parameter detection module connects step down side by low-pressure side parameter acquisition circuit, the input end of transformer monitoring temperature module connects transformer by temperature collection circuit, and the output terminal of transformer monitoring temperature module connects blower fan by draught fan control circuit; The man-machine interaction plate is provided with operation keyboard and LCD.

Real-time loss of transformer in service of the present utility model and load monitoring device, the CPU of transformer operational parameter detection module adopts the TMS320LF2812A chip.

Real-time loss of transformer in service of the present utility model and load monitoring device, the CPU of transformer monitoring temperature module adopts the TMS320LF2407A chip.

The utility model is by the real-time monitoring that detects voltage, electric current and the realization of transformer top-oil temperature of step down side to transformer real-time empty load-loss in service and load loss.Actual open circuit loss (the P of transformer in service _{O reality}) computing formula is:

Wherein: U is the low-pressure side virtual voltage, and I is the low-pressure side actual current, P _oBe transformer noload losses, Z% is 75 ℃ of impedances of transformer, I _NBe the step down side rated current.

Transformer actual loading loss (P in service _{Cu reality}) computing formula is:

Wherein: I is the low-pressure side actual current, and t is the transformer top-oil temperature, P _CuBe 75 ℃ of losses of transformer load, I _NBe the step down side rated current.

The actual output loss of transformer in service is calculated by following formula:

$U\×I\×\cos \mathrm{\φ}\×\sqrt{3}$

Electric energy metrical needs timing, and in per second, then electric energy (W) computing formula is:

$W=P\×\left(\frac{1}{60\×60}\right)\÷1000$

Realtime power when wherein P is the transformer operation, total electric energy obtains by adding up.

The CPU of transformer monitoring temperature module adopts the TMS320LF2407A that TI (Texas Instrument) company produces in the utility model (Fig. 2), it is the 16 bit DSP chips of using at the control field specially, having high speed signal handles and the necessary architecture of digital control function, its instruction execution speed is up to 40MIPS, and the instruction of the overwhelming majority can be finished in the monocycle of a 25ns.In addition, it also has I/O (I/O) port and other peripherals in the very powerful sheet, has simplified transformer monitoring temperature module periphery circuit design, has reduced system cost.TMS320LF2407A integrates program storage, data-carrier store, CAN communication controler, it is little to make transformer monitoring temperature module have a volume, the characteristics that antijamming capability is strong, but long-term work waits the temperature environment of strong electromagnetic interference environment and-45～+ 80 ℃ in transformer case.

The CPU of transformer operational factor monitoring modular adopts the TMS320LF2812A that TI company produces in the utility model (Fig. 2); it is 32 multiple functional bit DSPs; have the performance up to 150MIPS, its function comprises that bus on monocycle 32*32MAC, the many silvers, single protection path, one-cycle instruction are carried out, powerful addressing mode, shift unit and integrated real-time simulation.Built-in big internal memory and integrated Peripheral Interface on the TMS320LF2812A sheet, it is little make to adopt the transformer operational factor monitoring modular of this dsp chip design have a volume, reliability height, characteristics such as antijamming capability is strong.

This monitoring device software and hardware all adopts modular design, be convenient to installation, maintenance and system extension, monitoring device also has RS485 universal serial bus and CAN (controller area network network) industrial field bus interface, make things convenient for the networking of transformer centralized monitoring system, can be widely used in the operational factor monitoring field of power transformer.

Claims (3)

1. real-time loss of transformer in service and load monitoring device, it is characterized in that: is made up of the supervisory circuit plate and the man-machine interaction plate that connect by the RS232 universal serial bus, the supervisory circuit plate also is provided with RS485 universal serial bus and the CAN industrial field bus interface that can network with background monitoring software; The supervisory circuit plate is provided with by RS232 universal serial bus interconnective transformer operational parameter detection module and transformer monitoring temperature module, the input end of transformer operational parameter detection module connects step down side by low-pressure side parameter acquisition circuit, the input end of transformer monitoring temperature module connects transformer by temperature collection circuit, and the output terminal of transformer monitoring temperature module connects blower fan by draught fan control circuit; The man-machine interaction plate is provided with operation keyboard and LCD.

2. real-time loss of transformer in service according to claim 1 and load monitoring device is characterized in that: the CPU of transformer operational parameter detection module adopts the TMS320LF2812A chip.

3. real-time loss of transformer in service according to claim 1 and 2 and load monitoring device is characterized in that: the CPU of transformer monitoring temperature module adopts the TMS320LF2407A chip.

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