High-precision resistance generator of automatic relay-protection simulation system and testing method

Abstract

The invention discloses a high-precision resistance generator of an automatic relay-protection simulation system, which is used for replacing a motor rotor to carry out function detection of a generator-transformer set protection device. The high-precision resistance generator comprises a resistance box, a micro-controller, an input module and a display module, wherein the resistance box is connected to the generator-transformer set protection device through the output circuit of the resistance generator; the micro-controller is in circuit connection with the resistance box, outputs resistance control signals to the resistance box, and controls resistance output by the resistance box; the input module is in circuit connection with the micro-controller and inputs resistance control instruction into the micro-controller; the micro-controller outputs the resistance control signals according to the resistance control instruction; and the display module is in circuit connection with the micro-controller and displays a numerical value of resistance output by the resistance box under the control of the micro-controller. According to the invention, the expensive generator is replaced by the high-precision resistance generator; the practical training cost for operating the generator-transformer set protection device is reduced; the resistance generator is in the form that a relay is combined with a resistance network; the relay is controlled by the micro-controller to switch the resistance network; and the precise output of resistance is realized.

Description

technical field [0001] The invention relates to a resistance generating technology used in generator protection testing, in particular to a high-precision resistance generator used in a relay protection automation simulation system and a testing method thereof. Background technique [0002] Such as figure 1 Shown is a circuit diagram of a generator in the prior art, which includes an excitation circuit 1', a rotor 2' and a stator 3', wherein the rotor 2' passes through R E and C E grounded. In the excitation circuit of the generator, the insulation of the generator rotor is the weak link, because it not only has a high operating temperature, but also has a high speed. The rotor winding is subject to strong centrifugal force, and it is easy to rub against each other, which is easy to cause insulation damage. At the same time, the cooling air may also bring carbon dust, dust, oil and water vapor into the rotor and accumulate in the winding ends and slots to reduce the insul...

AI Technical Summary

Problems solved by technology

[0007] 2. The hazards of two-point grounding of the rotor:

[0009] 2) The two-point grounding causes the non-short-circuit winding current to increase. If the short-circuit current flowing through the rotor body is large (usually 1 500 A is the limit), the thermal effect will burn the rotor and cause the rotor to deform slowly, resulting in eccentricity. Intensify the vibration

[0011] At present, due to the high price of generators, there is a lack of external connection devices (namely generators) for simulating the 4’ protection of generator-transformer protection devices during the commissioning and training of the 4’ protection devices of generator-transformer units.

Therefore, this project aims to design a high-precision resistance generator for the lack of external connection devices (the price is relatively expensive) in the existing technology, and it is impossible to carry out the commissioning and training of the generator rotor one-point grounding and two-ground grounding protection. device, and add a suitable external circuit design to replace the external connection device, to achieve the same training effect

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