Calibration device and method for a photoelectric current transformer

Abstract

The invention discloses a calibration device and a method for a photoelectric current transformer. The calibration device comprises a voltage source, a telecontrol module and a signal acquisition module; the voltage source is used to generate an analog photoelectric current to be calibrated The voltage signal of the output signal of the photocurrent sensor of the transformer, the voltage signal is a voltage analog quantity; the voltage source is connected with the remote control module to form a virtual measurement channel; the remote control module converts the voltage analog quantity into an optical signal, the optical signal As a reference signal for calibration, it is transmitted to the photoelectric converter of the photoelectric current transformer to be calibrated through an optical fiber. The signal acquisition module is a power control system or a power protection system connected to the photoelectric converter of the photoelectric current transformer to be verified. The calibration device and the method for the photoelectric current transformer are easy to implement, low in cost and high in calibration accuracy.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and relates to a calibration device and method for a photoelectric current transformer. Background technique [0002] With the popularization of (ultra) high-voltage direct current transmission technology, the application of photoelectric current transformers in power systems is also increasing. As the most important state quantity of (Ultra) HVDC transmission, the data measured by photoelectric current transformers directly participate in the calculation of HVDC control and protection functions, and have a great impact on the safe and stable operation of (Ultra) HVDC transmission. If the on-site verification of the DC control and protection system is carried out, it is impossible to avoid the virtual load verification of the measurement channel where the photoelectric current transformer is located. The transmission principle of the commonly used photoelectric current transformer...

AI Technical Summary

Problems solved by technology

However, this method needs to disconnect and connect the circuit once, and use a power source capable of outputting a large current, which is time-consuming, labor-intensive, and has a high safety risk.

More importantly, due to the limitation of the capacity of the added equipment, the method of applying the analog quantity on the primary side can generally only apply the analog quantity equivalent to the rated operating current at the maximum, which cannot fully meet the needs of the on-site verification of the DC control and protection system (maximum 5 times the rated current is required)

[0003] Existing calibration methods for current transformers are many, but generally for electronic current transformers of exchange, such as the method for live calibration of current transformers whose publication number is CN 101408597A, its application number is CN200710046987; The patent application number CN201120439554.3 discloses an online calibration device for high-voltage current transformers; none of these calibration devices and methods can be applied to photoelectric current transformers

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