CN103558465A - Method for on-line precision calibration of 10kV protecting device - Google Patents
Method for on-line precision calibration of 10kV protecting device Download PDFInfo
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- CN103558465A CN103558465A CN201310519182.9A CN201310519182A CN103558465A CN 103558465 A CN103558465 A CN 103558465A CN 201310519182 A CN201310519182 A CN 201310519182A CN 103558465 A CN103558465 A CN 103558465A
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Abstract
The invention relates to a method for maintaining and repairing a 10kV protecting device, in particularly to a method for on-line precision calibration of the 10kV protecting device. The method for on-line precision calibration of the 10kV protecting device is characterized in that relay protecting equipment is compared according to the standards that the accuracy grade of a CT for measuring and controlling is higher than the accuracy grade for relay protecting, and the collecting precision of data collected by measuring and controlling equipment is high for the reason of a current transformer. Calibration modules are integrated in a CPU of a relay protecting device, when an instruction of a dispatching monitoring system is received, the replay protecting equipment can be compared through CT sampling, the measuring and monitoring equipment can be compared through CT sampling, and the sampling precision of the relay protecting equipment can be calculated automatically. Thus, power outage processing does not need to be conducted on the protecting device, and the reliability of operation of a power grid is guaranteed. Moreover, automation is achieved in the whole processing process, tedious operation such as power outage operation and simulation current connecting is of no need, and therefore the calibration method is simple, reliable, and high in efficiency.
Description
Technical field
The present invention relates to a kind of repair method of 10kV protective device, particularly a kind of online precision checking method of 10kV protective device.
Background technology
In 10kV feeder line; its current transformer (CT) has comprised to CT and measure and control device CT for relay protection device; and typical relay protection device is when carrying out accuracy test; must this relay protection device is out of service; then on the terminal row of its secondary loop of mutual inductor, disconnect; pass through again terminal row, by simulating specified electric current, carry out the sampling precision of verification relay protection devices.Its weak point is, the ability checking precision that needs to have a power failure, and have a power failure and will cause the unreliable of operation of power networks, and have influence on the normal operation of power supply interrupted district, secondly, complicated operation, needs off device, analog current, finally also want access device to guarantee operation, complex steps, efficiency is low.
Summary of the invention
The object of the invention is to provides a kind of simple, the online precision checking method of 10kV protective device that reliable, efficiency is high according to the deficiencies in the prior art part.
The object of the invention is to realize by following approach:
The online precision checking method of 10kV protective device, its main points are, comprise the steps:
A kind of correction verification module is provided, and it includes data receiver unit, comparison judgment unit, the telecommunication unit sequentially connecting, and wherein data receiver unit can receive relay protection device on 10kV feeder line and with CT and measure and control device, use the sampled data of CT; Telecommunication unit is connected with Dispatching monitor and control system by wireless network,
Telecommunication unit receives the instruction from Dispatching monitor and control system, and relay protection device is carried out to precision checking;
The CT primary circuit of 10kV feeder line collects after electric current, through CT, converts, and then via CT secondary circuit, sends respectively CT and measure and control device CT for relay protection device to,
The data receiver unit of correction verification module receives the sampled value of sampling with CT with CT and measure and control device from relay protection device respectively, and sends comparison judgment unit to;
Comparison judgment unit makes the following judgment verification: first two groups of data are carried out to analog to digital conversion; then current phasor relay protection device being adopted with CT and measure and control device compare with the current phasor of CT sampling: when both error of amplitude is no more than 5%; when angular error is no more than 3%, confirm that the sampling precision of relay protection devices is qualified.
Ultimate principle of the present invention is: due in 10kV feeder line, current transformer has comprised the CT that the CT that uses to relay protection devices and measure and control device are used, and the accuracy rating (5P20 or 10P20) that will use higher than relay protection of the accuracy rating (0.5 grade) of the CT that uses of observing and controlling; In addition, in the relay protection devices of 10kV, 10kV relay protection devices and measuring and controlling equipment are integrated designs, therefore consider data that measuring and controlling equipment is gathered with CT as benchmark to relay protection device CT comparison.
On the basis of above-mentioned principle; the present invention introduces a kind of correction verification module; for the data that automatically relay protection device gathered with CT with CT and measure and control device, carry out automatic reception, comparison and calculating, and calculate according to the requirement of host computer (Dispatching monitor and control system), and feed back result of calculation.So just, without processing that protective device is had a power failure, guaranteed the reliability of operation of power networks, and processing procedure is all to generate voluntarily, without carrying out the troublesome operation such as power operation, access analog current, so method of calibration is simple, reliable, efficiency is high.
Described correction verification module is integrated on the processor in relay protection device.
Because relay protection device itself has the CPU of data processing function; and in 10kV feeder line, relay protection devices and measuring and controlling equipment are integrated designs, therefore direct integrated correction verification module in relay protection device; correction verification module can certainly be set in addition, adopt PC to realize.
Below in conjunction with embodiment, the present invention is described further.
Embodiment
Most preferred embodiment:
The online precision checking method of 10kV protective device, comprises the steps:
A kind of correction verification module is provided, and it includes data receiver unit, comparison judgment unit, the telecommunication unit sequentially connecting, and wherein data receiver unit can receive relay protection device on 10kV feeder line and with CT and measure and control device, use the sampled data of CT; Telecommunication unit is connected with Dispatching monitor and control system by wireless network, and described correction verification module is integrated on the processor in relay protection device.
Telecommunication unit receives the instruction from Dispatching monitor and control system, and relay protection device is carried out to precision checking;
The CT primary circuit of 10kV feeder line collects after electric current, through CT, converts, and then via CT secondary circuit, sends respectively CT and measure and control device CT for relay protection device to,
The data receiver unit of correction verification module receives the sampled value of sampling with CT with CT and measure and control device from relay protection device respectively, and sends comparison judgment unit to;
Comparison judgment unit makes the following judgment verification: first two groups of data are carried out to analog to digital conversion; then current phasor relay protection device being adopted with CT and measure and control device compare with the current phasor of CT sampling: when both error of amplitude is no more than 5%; when angular error is no more than 3%, confirm that the sampling precision of relay protection devices is qualified.
Main points of the present invention are: due in 10kV feeder line, current transformer has comprised the CT that the CT that uses to relay protection devices and measure and control device are used, and the accuracy rating (0.5 grade) of the CT that uses of observing and controlling is wanted the accuracy rating (5P20 or 10P20) that generally use higher than relay protection; In addition,, in the relay protection devices of 10kV, 10kV relay protection devices and measuring and controlling equipment are integrated designs.Therefore the present invention, by verification module integration in the CPU of relay equipment, when the instruction of receiving Dispatching monitor and control system, can compare with CT sampling and measure and control device relay protection device, and automatically calculate the sampling precision of relay protection devices with CT sampling.So just can avoid having a power failure can verification relay protection devices sampling precision.
Concrete: the electric current of 10kV relay protection device collection is through after current transformer (CT) conversion, through CT secondary circuit, delivers to relay protection device.The CT of 10kV feeder line generally has two groups of taps, and one group to relay protection devices use, uses for one group to measure and control device (also claiming measuring and controlling equipment).Two groups of electric currents that collect all deliver to that in the CPU of relay protection devices, (10kV relay protection devices and measuring and controlling equipment are one, so two data that collect can be compared) and the data that gather of measuring and controlling equipment because the reason acquisition precision of current transformer is higher, can be used as benchmark and compare to relay protection devices.
It is same as the prior art that the present invention does not state part.
Claims (2)
- The online precision checking method of 1.10kV protective device, is characterized in that, comprises the steps:A kind of correction verification module is provided, and it includes data receiver unit, comparison judgment unit, the telecommunication unit sequentially connecting, and wherein data receiver unit can receive relay protection device on 10kV feeder line and with CT and measure and control device, use the sampled data of CT; Telecommunication unit is connected with Dispatching monitor and control system by wireless network,Telecommunication unit receives the instruction from Dispatching monitor and control system, and relay protection device is carried out to precision checking;The CT primary circuit of 10kV feeder line collects after electric current, through CT, converts, and then via CT secondary circuit, sends respectively CT and measure and control device CT for relay protection device to,The data receiver unit of correction verification module receives the sampled value of sampling with CT with CT and measure and control device from relay protection device respectively, and sends comparison judgment unit to;Comparison judgment unit makes the following judgment verification: first two groups of data are carried out to analog to digital conversion; then current phasor relay protection device being adopted with CT and measure and control device compare with the current phasor of CT sampling: when both error of amplitude is no more than 5%; when angular error is no more than 3%, confirm that the sampling precision of relay protection devices is qualified.
- 2. the online precision checking method of 10kV protective device according to claim 1, is characterized in that, described correction verification module is integrated on the processor in relay protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310519182.9A CN103558465A (en) | 2013-10-29 | 2013-10-29 | Method for on-line precision calibration of 10kV protecting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310519182.9A CN103558465A (en) | 2013-10-29 | 2013-10-29 | Method for on-line precision calibration of 10kV protecting device |
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| CN103558465A true CN103558465A (en) | 2014-02-05 |
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| CN201310519182.9A Pending CN103558465A (en) | 2013-10-29 | 2013-10-29 | Method for on-line precision calibration of 10kV protecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113283068A (en) * | 2021-05-18 | 2021-08-20 | 天津凯发电气股份有限公司 | Method for improving alternating current sampling precision and reliability of relay protection device |
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| US20110153244A1 (en) * | 2008-05-13 | 2011-06-23 | Rocha Alves Jr Jose Eduardo Da | Individualized self-monitoring system for transformers in power measurement installations and method of self-monitoring and diagnosis of transformers in power measurement installations |
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Application publication date: 20140205 |
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