Optical voltage transformer developed countries photoelectric current voltage transformer sensing methods can be divided into two kinds of active-and passive

Optical voltage transformer developed countries photoelectric current voltage transformer sensing methods can be divided into two kinds of active-and passive. Active type active high side voltage signal by  electri cenergy meter  signal is passed in.  Voltage stabilizer  signal to the light emitting diode, and then transmitted from the optical fiber to the low potential side, into an electrical signal for the inverter output after amplification. The luminous intensity of the diode is proportional to the applied voltage, the signal output is proportional to the applied voltage. Study how the photoelectric transformer substation automation system interface and communication, the realization of photovoltaic substation digitization will be of great significance.

Application of photovoltaic technology to transmit information through fiber-optic measurement of large currents or high voltage transformer

Application of photovoltaic technology to transmit information through fiber-optic measurement of large currents or high voltage transformer. The high potential (or far) end, the measured current or voltage modulation of the optical signal transmitted through the optical fiber to the ground potential (or measurement) side,  mcb circuit breaker  conversion and demodulation electronics to obtain the measured current or voltage. According to the working principle of this device, also measure the temperature in the high potential side, vibration, displacement signal. Power systems commonly used electromagnetic    air circuit breaker high current or high voltage. Optical voltage transformer here only passive type photoelectric current common basic structure of voltage transformers, voltage  electric meter  by high optical parts, fiber optic voltage sensor and the photodetector three major components. High-pressure parts, including high-voltage insulated casing, insulating gas, etc., the measured high voltage is applied to the upper electrode and lower electrode is grounded, bubble Michaels crystal electro-optic effect in the electric field. If the high voltage by a capacitive voltage divider at a certain partial pressure ratio, reduced to the optical voltage sensor can withstand a lower voltage, referred to as capacitor divider type.

Traction substation integrated automation system of traction substation information analysis shows main connection

Make full use of information to achieve integrated automation system of traction substation current transformer disconnection fault detection is the purpose of this article.  Voltage stabilizer  integrated  Electric energy meter  of traction substation information analysis shows the main junction line, for example, integrated automation system from the voltage, current transformers collect the following information:  Circuit breaker  transformer: the secondary winding and measuring winding protection to provide current protection devices. Shunt capacitor compensation branch current transformer: the secondary winding and measuring winding protection device provides current to the relay. Current transformer low voltage side of the transformer: secondary winding and measuring winding protection device provides current to the relay.

System under the operation of the system transformer disconnection cause great harm

Integrated transformer disconnected from the system under the operation of the system caused great harm, and especially mutual disconnection staggering flow, traction substation current transformers in the event of failure will cause the flow cross  air circuit breaker  relay or automatic device does not work properly, endanger the safe operation of the traction power supply system, for example: the feeder current transformer secondary winding protection disconnection, short circuit fault occurs in the feeder, the current class and the impedance of the protected class will refuse to move; transformer differential  power transformers of the current transformer secondary side break, under normal load, external short circuit, the differential protection will malfunction. Currently, the integrated automation system in the railway traction power supply system has been a large number of applications.

General nonlinear model of the current transformer, highlighted in the actual simulation programming

Describes the general linear model of current transformer, highlighted in the actual simulation programming, how the RMS voltage and current provided by the manufacturer into a current transformer  electric meter  curve, thus completing the magnetizing  Voltage stabilizer  linear simulation . Finally, an example described in the transient simulation, different short circuit current on the primary side of the current transformer saturation degree of influence. Current transformer  Air circuit breaker  is nonlinear model plants and important substation electrical equipment, which is mainly non-linear electromagnetic components, which in the case of normal operation and fault secondary output current size depends entirely on the excitation current.

Measurement and protection devices usually can not be directly connected to a high voltage, high current power loop

To ensure the power system security and economic operation of the power system needs of various electrical equipment and its related  Circuit breaker  measured in order to make the necessary measurement, monitoring and protection. Measurement and  mcb circuit breaker  usually can not be directly connected to a high voltage, high current power back on the road, while the high level of electrical parameters need to be converted into a low  electric transformer  or signals. Current transformer (CT) is a large current in proportion to the circuit is converted into a secondary small current measuring apparatus the primary and secondary windings wound on the same core of the closed magnetic circuit.

The voltage level higher and higher, current transformer secondary winding current accuracy, the correct action related to the protection and testing, measurement accuracy

With the development of network, more and more high voltage level, current transformer secondary winding current accuracy, the correct action related to the protection and testing, measurement accuracy. Early vote in the substation when tested on the current transformer is to ensure correct operation of relay protection and  Circuit breaker , measurement accuracy of the necessary conditions. Currently, we use more feedthrough current air circuit breaker  windings are measured difference method and the method of ampere-turns, etc., because these two methods can not simulate actual field, often overlooked in the calibration of the external magnetic field, resulting in on-site verification when the measurement error increases. Found the problem in the Substation, we check for current  power transformers , the use of other current comparative law, that the last increase 200A current, secondary display 0.2A, test connection. The results showed that the seven 330kV current transformer windings error tolerance. Experimental data show that the phase current transformer current measured value is found from the above data, all winding current into and out of imbalance, and laboratory equipment from the current transformers were tested farther, the smaller the error, the greater the contrary.