The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of simple and convenient time saving, utilization for being easy to implementRelay-protection tester detects the method and device of differential protection for generator polarity.
The invention provides a kind of method for detecting differential protection for generator polarity, by relay-protection tester output multi-channelAlternating current, each road alternating current through cable respectively by the straight-through current transformer at generator both ends, secondary survey electric current byCurrent transformer flows into differential protection for generator device, and the presence or absence of difference current is checked by differential protection for generator device, andJudge the correctness of differential protection for generator polarity.
Further, differential protection for generator device is additionally operable to judge the integrality of CT secondary circuits.
Further, relay-protection tester exports 6 road alternating currents.
Present invention also offers a kind of device for detecting differential protection for generator polarity, including relay-protection tester, ifStraight-through current transformer and differential protection for generator device in generator both ends；
Relay-protection tester includes multichannel AC electric current output end, each road alternating current of alternating current output end outputIt is connected respectively by current transformer, current transformer with differential protection for generator device through cable, for by secondary survey electric currentDifferential protection for generator device is flowed into through cable by current transformer, having for difference current is checked for differential protection for generator deviceNothing, and judge the correctness of differential protection for generator polarity and the integrality of CT secondary circuits.
Further, relay-protection tester also includes alternating current input.
Further, alternating current output end output each road alternating current through cable respectively by current transformer after flowEnter alternating current input.
Further, the quantity of alternating current output end is 6
Further, the quantity of alternating current input is 2.
By such scheme, by detecting the method and device of differential protection for generator polarity, relay protection test is utilizedInstrument is checked differential protection for generator polarity, can simply, easily be detected differential protection for generator polarity, be improvedThe efficiency of detection.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,And can be practiced according to the content of specification, below with presently preferred embodiments of the present invention and coordinate accompanying drawing describe in detail as after.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Implement belowExample is used to illustrate the present invention, but is not limited to the scope of the present invention.
The invention provides a kind of method for detecting differential protection for generator polarity, by relay-protection tester output multi-channelAlternating current (such as 6 tunnels), each road alternating current pass through the straight-through current transformer at generator both ends, secondary survey respectively through cableElectric current flows into differential protection for generator device by current transformer, and having for difference current is checked by differential protection for generator deviceNothing, and judge the correctness of differential protection for generator polarity.
In the present embodiment, differential protection for generator device is additionally operable to judge the integrality of CT secondary circuits.
Relay-protection tester uses unit independent operating, can also couple the advanced configuration of notebook computer operation.Main frameBuilt-in high speed digital signal processor microcomputer of new generation, true 16 DAC modules, novel plug formula high-fidelity High-power amplifier, fromWith big screen LCD and flexible rotation mouse controller.Electric current output amplitude scope：0-30A precision：0.2%, six phase current Parallel opertation maximums：180A, six are in parallel peak power：900VA, six be in parallel maximum output when permitPerhaps the working time：10s, phase current allow working value for a long time：10A.
Differential protection for generator device is to utilize Kirchhoff's law, and in generator neutral point, (electric current flows into generatorPoint) and generator generator terminal (electric current flows out the point of generator) one group of current transformer of each installing, by the two current transformersSecondary output is connected to differential protection module, and protection module judges whether the two electric currents are equal, under normal circumstances two electric current phasesDeng protection is failure to actuate, and when short trouble occurs for generator unit stator and its lead-out wire, the electric current of generator input and output is just notEqual, then differential protection snap action is in generator outlet breaker, so as to protect generator.
The method for the detection differential protection for generator polarity that the present embodiment provides, using relay-protection tester to generatorDifferential protection polarity is checked, can simply, easily detect differential protection for generator polarity, improves the effect of detectionRate.
Join shown in Fig. 1, present invention also offers a kind of device for detecting differential protection for generator polarity, including relay protectionTester 1, straight-through current transformer 21 and differential protection for generator device 3 located at the both ends of generator 2；
Relay-protection tester 1 includes multichannel AC electric current output end 11, and each road that alternating current output end 11 exports is handed overStream electric current is connected by current transformer 21, current transformer 21 with differential protection for generator device 3 respectively through the first cable 13,It is poor for generator for secondary survey electric current to be flowed into differential protection for generator device 3 through the second cable 22 by current transformer 21Dynamic protection device 3 checks the presence or absence of difference current, and judges the correctness and CT secondary circuits of differential protection for generator polarityIntegrality.
Relay-protection tester 1 uses unit independent operating, can also couple the advanced configuration of notebook computer operation.Main frameBuilt-in high speed digital signal processor microcomputer of new generation, true 16 DAC modules, novel plug formula high-fidelity High-power amplifier, fromWith big screen LCD and flexible rotation mouse controller.Electric current output amplitude scope：0-30A precision：0.2%, six phase current Parallel opertation maximums：180A, six are in parallel peak power：900VA, six be in parallel maximum output when permitPerhaps the working time：10s, phase current allow working value for a long time：10A.
Differential protection for generator device 3 is to utilize Kirchhoff's law, and in generator neutral point, (electric current flows into generatorPoint) and the generator terminal of generator 2 (electric current flows out the point of generator) one group of current transformer 21 of each installing, by the two current transformers21 secondary output is connected to differential protection module, and protection module judges whether the two electric currents are equal, under normal circumstances two electricityTo flow equal, protection is failure to actuate, when short trouble occurs for generator unit stator and its lead-out wire, the electric current of generator input and outputWith regard to unequal, then differential protection snap action is in generator outlet breaker, so as to protect generator.
The device for the detection differential protection for generator polarity that the present embodiment provides, using relay-protection tester to generatorDifferential protection polarity is checked, can simply, easily detect differential protection for generator polarity, improves the effect of detectionRate.
In the present embodiment, relay-protection tester 1 also includes alternating current input 12.
In the present embodiment, each road alternating current that alternating current output end 11 exports passes through electricity respectively through the first cable 13Alternating current input 12 is flowed into after current transformer 21.
In the present embodiment, the quantity of alternating current output end 11 is 6
In the present embodiment, the quantity of alternating current input 12 is 2.
Described above is only the preferred embodiment of the present invention, is not intended to limit the invention, it is noted that for this skillFor the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is some improvement andModification, these improvement and modification also should be regarded as protection scope of the present invention.