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5.2.7 over-excitation limitation function: ( excitation current and stator current limit)

Excitation limiting function ( excitation current and stator current limiting )

According to the PQ generator characteristic curve to check its limit the generator at a power output under reactive load. In P = 50% cases according to the stator current value setting the parameters of generator excitation current limiter action and recording terminal voltage of generator excitation current excitation voltage active and reactive power signal according to the system response appropriate adjustment of PID parameters in limiter action on the regulator stability is good.

5.2.8 strong excitation limit function:

Inverse time starting current is 1.1 times the load rated excitation current, and according to the generator thermal curve to determine the inverse time characteristic.

5.2.9 volts Hertz limit:

To avoid generating set and the excitation transformer iron core through magnetic flux saturation, regulator equipped with V / Hz limiter and characteristic curve, if the generator voltage is above a certain frequency lower limit value, will automatically reduce the given value of the generator voltage requirements with characteristic curve. According to setting limit check its protective action should be correctly. During no-load operation situation drop generator speed verify V / Hz limiter work normal.

5.2.10 pulse examination:

( static test ) check rectifier screen six phase pulse amplitude and phase of the correctness. Recording trigger circuit of phase shift characteristic.

5.2.11 PT breaking and missing pulse switching test

Regulator in the A channel operation, disconnect any one phase voltage or analog pulse loss, regulator should switch to B channel operation.

5.2.12 low-excitation limited test

P / Q low excitation limit test, low-excitation side stator current limit, minimum excitation current limit.

Set P / Q low excitation limit parameter, in P = 0%, 25%, 50%, 75%, 100% in the case of the generator excitation system to reduce the low excitation limiter action, recording limiter action current operation value, by doing step load limiter action after the performance validation.

In the generator with different load cases, artificial regulation of excitation, the leading phase operation of generator under excitation limiter limits, till action. And record the low-excitation limited movement of the active power and reactive power. Do 3-5, depict the low-excitation limited line.

In the active P = 0%, 25%, 50%, 75%, 100% in the case of the generator phase advance operation verification of low excitation limit in a pre-set limit line can correct action and in the limit point of doing step response. Usually step volume < 3% to test low excitation limiter action stability according to the response system to adjust PID parameters in the test process of recorded wave voltage excitation current excitation electric pressure of active and reactive power signal and record limit action corresponding to the excitation current value. According to the automatic running mode under low excitation limit action recorded when the corresponding excitation current value set manual operation mode under low excitation limit line parameters.

5.2.13 inverter de-excitation test

The generator no-load rated operation, manual inverse de-excitation and trip fmk, recording demagnetization process of excitation voltage, excitation current, voltage and other data. Simultaneous measurement of de-excitation time. Exit command was inactivated by excitation magnetic recording terminal voltage excitation voltage excitation current signal validation de-excitation process.

The 5.2.14 regulator load rejection test ( left active and casting reactive power test )

A left active: generator with 50% and rated 100% load operation, suddenly jump development motor switch, the rejection to the load, record generator excitation voltage, excitation current, voltage, waveform, recorded before and after load rejection n numerical stability.

B. Casting reactive power: usually with appropriate active P = 15% in var Q = 10% 25% 50% 75% 100% five point on the load rejection test and recording terminal voltage of generator excitation current and reactive power signal in the test process according to the response system is adjusted in response to the control parameters to swing load voltage overshoot in line with gb. ( special test be arranged )

5.2.15 rectifier cabinet on-line measurement of flow inspection

5.2.16 rotor grounding protection

The person with the standard of grounding resistance box in the rotor circuit with resistor, the circuit to the alarm value causes the alarm protection, to reduce grounding resistance action trip exports de-excitation switch.

5.2.17 PT breaking test

In the case of no-load operation pull PT wiring verification switch control logic of normal and recording terminal voltage excitation voltage excitation current signal.

The 5.2.18 after completion of the test: careful proofreading two channel parameter setting confirmation parameters back to FLASH MEMORY remove the debugging tools for the debugging process of removal of the panel screws and connecting the recovery and clean-up site on the control panel will control the cutting away into the distance. In one test, the accident memory unit.