RU2665741C1 - Device for testing controlled shunt reactors - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: claimed invention relates to electrical engineering, in particular to the measurement of the parameters of controlled shunt reactors. Output of the averager is connected with a frequency controller and by phase voltage regulators, to the inputs of which the setpoint block, voltage sensors and the phase angle calculator of this phase are connected. In addition, voltage regulators can be connected to the control inputs by FI voltage through current regulators, the second input connected to current sensors. Device for testing controlled shunt reactors (CSR) is equipped resonantly with an averager of the phase angle of the FI, connected input to the outputs of the phase angle calculators.

EFFECT: technical result consists in reducing the energy losses due to the simplification of control.

1 cl, 2 dwg

Description

The offer relates to electrical engineering.

The well-known [1] circuit of a device for a similar purpose, containing a frequency converter output connected to a transformer. The disadvantage of this device is the complexity of control, since it does not provide for an independent setting of the output voltage and frequency.

The closest in technical essence and the achieved results to all options is [2] a device for testing controlled shunt reactors (CSR) with a resonant method, output through current sensors connected to a capacitor and CSR, containing IF voltage sensors connected to phase angle calculators to which the outputs of the current sensors are also connected. The disadvantage of such a device is manifested in the relatively complex procedure of adjusting the required test mode.

The technical result of the proposal is to reduce energy losses, simplified management. The technical result is achieved due to the fact that the device is equipped with a phase angle averager, an input connected to the outputs of the phase angle calculators, the output of the averager is connected to a frequency controller and phase voltage regulators, the inputs of which are also set point and voltage sensors and a phase angle calculator of this phase . Additionally, the device is designed so that the voltage regulators are connected to the control inputs of the inverter voltage through current regulators, the second input connected to current sensors.

In FIG. 1 shows a diagram of the device, and in FIG. 2 fragment of it for an additional paragraph. Designated: 1 - frequency converter, adjustable in frequency (f) simultaneously, all three phases and phase-by-phase voltage (A, B, C), 2 - current sensors, 3 - voltage sensors, 4 - tested CSR, 5 - DC magnetization source CShR, 6 - capacitors, 7 - phase angle calculators (between voltage and current), 8 - averager (calculates the average value of three phases), 9 - frequency regulator, 10 - set point block, 12 - voltage regulators (phase-by-phase), 13 - voltage setting block. In Fig.2 there are current regulators 14. The device operates as follows. A DC current from source 5 is supplied to the tested CSR 4. This determines the operating point (inductance value) of the CSR at rated voltage), for which the capacitance of the capacitors is selected at a frequency of 50 Hz 6. For FC1, an increased frequency is set at the beginning of the process (80-100 Hz ) Block 13 sets a reduced voltage (about 2%) at the output of the inverter 1. At a low voltage, the inductance of CSR4 is higher than at rated voltage. Therefore, an increased frequency is supplied. The calculators 7 determine the phase angle, which is averaged by the averager 8. The controller 9 changes the frequency of the inverter 1 until a resonance occurs at which the angle becomes zero. Since there is a spread in the inductance of CSR 4 and battery 5 in phases, then to achieve resonance in all phases. At the same time, the regulators 12, taking into account the difference in the average angle (output of the averager 8) and this phase (output of the calculator 7 of this phase), adjust the magnitude of the phase voltage. Slowly, the voltage setting is increased by block 13 until it reaches the rated value. Throughout, there is a frequency adjustment to the resonant value. In the steady state, the parameters are measured and the properties of the tested CSR4 are evaluated. In the circuit of Fig. 2, the voltage regulator 12 is subject to a faster controller 13 of the current, which provides greater stability. This ensures a stable test process.

Information sources

1. Patent for utility model of the Russian Federation No. 142928, cl. G01R 31/12, June 17, 2013

2. Patent for the invention of the Russian Federation No. 2508589 class. Н02J 3/01, Н02Н 9/04.

Claims (2)

1. A device for testing controlled shunt reactors (CSR) in a resonant manner, comprising a frequency converter (IF) connected to a capacitor through an output current sensor and a CSR containing an IF voltage sensor connected to phase angle calculators, to which current sensor outputs are also connected, characterized in that it is equipped with a phase angle averager connected to the input to the outputs of the phase angle calculators, the output of the averager is connected to a frequency controller and phase-by-phase voltage regulators, to the inputs to toryh attached as block setpoint voltage sensors and the calculator of the phase angle of this phase. 2. A device for testing controlled shunt reactors (CSR) by the resonance method according to claim 1, characterized in that the voltage regulators are connected to the control inputs by the inverter voltage through current regulators, the second input connected to current sensors.

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