CN204269707U - A special electronic transformer for HGIS - Google Patents

Abstract

The utility model discloses a kind of HGIS specialized electronic formula mutual inductor, belong to the technical field of mutual inductor, it comprises the electric conductor in socket case, sleeve pipe and the sensing head parts in housing and collector; These sensing head parts comprise electric capacity ring, Luo-coil and low power current transformer; Sensing head parts are connected with collector simultaneously, electric capacity gas-insulated medium is provided with between electric capacity ring and socket case, utilize the high-pressure polar plate of cocurrent flow bus as the condenser divider of electronic type voltage transformer of inside pipe casing, utilize the shell of sleeve pipe as the ground connection pole plate of condenser divider; Wherein collector comprises power module and data processing module; Its beneficial effect is: without magnetic saturation, the advantage such as frequency response range is wide, precision is high, transient characterisitics are good, there is not High-Voltage Insulation problem; Temperature applicable range is wide, and design simplifies, and is connected by optical fiber, and digital signal is by Optical Fiber Transmission, and enhance anti-EMI filter performance, data reliability improves greatly.

Description

A special electronic transformer for HGIS

technical field

The utility model relates to the technical field of transformers, in particular to a special electronic transformer for HGIS.

Background technique

Smart substations are one of the important nodes in the construction of smart grids. Intelligent substations can significantly improve the stability, reliability, and transmission capacity of the power grid. The intelligent HGIS combined electrical appliance adapts to the requirements of smart substation construction, can provide information support functions for optimal dispatching and operation management of the power grid, provide optimization and decision-making basis for smart dispatching of the power grid and equipment operation management, and improve the asset management and operation level of substations.

The traditional traditional transformer uses oil or SF6, it is difficult to avoid the phenomenon of oil leakage and gas leakage of the transformer; the shortcomings of narrow frequency response range, low precision, poor transient characteristics, etc., and the range of transformer error fluctuation due to temperature changes is relatively large Large, poor reliability.

Utility model content

The problem to be solved by the utility model is to provide an electronic transformer that avoids air leakage and oil leakage, has a large frequency response range, high precision and good transient characteristics, and has a large temperature adaptability range and high reliability.

In order to achieve the above purpose, the solution of the utility model is: a special electronic transformer for HGIS, including the bushing shell, the conductor in the bushing shell and the sensor part in the bushing shell; The sensing head part includes a capacitor ring, a Rogowski coil and a low-power current transformer; a capacitor solid insulating medium is set between the capacitor ring and the bushing shell, and the capacitor ring is sleeved on the conductor, and the gap between the capacitor ring and the conductor is An insulating gas is arranged between them; and the Rogowski coil and the low-power current transformer are also sleeved on the conductor; at the same time, the sensor head part is connected with the collector; the collector includes a power supply module and a data processing module.

Further, in order to measure the gas density inside the bushing casing, a gas density sensor is provided in the bushing casing.

Further, in order to measure the temperature of the bushing shell, a temperature sensor is provided on the bushing shell.

Further, in order to output the data collected by the collector, the collector is connected with a combiner.

Further, in order to enhance the anti-EMI performance and improve the reliability of the data, the collector and combiner are connected through optical fiber and transmit data.

Further, in order to avoid the occurrence of high-voltage insulation problems, the collector and combiner are powered by DC low-voltage power supply.

Further, in order to improve the insulation performance, the insulating medium between the capacitor ring and the bushing shell is insulated with insulating grease.

The intentional effect of the utility model is: use the Rogowski coil to realize large current transmission, which has the advantages of no magnetic saturation, wide frequency response range, high precision, good transient characteristics, etc., which is beneficial to the realization of the new protection principle and the improvement of protection performance; HGIS The special electronic current/voltage transformer is a low-voltage electrical appliance in principle, and there is no high-voltage insulation problem; the working power of the collector unit is supplied by the DC power supply in the control cabinet; the oil or SF6 of the traditional transformer is replaced by insulating grease to avoid Transformer leakage, oil leakage and other phenomena; the accuracy of the current protection transformer can reach 5TPE, and the accuracy of the measurement current transformer can meet both 0.1 and 0.2S; the voltage transformer measurement accuracy can reach 0.2, and at the same time Realize the protection measurement function; in the whole temperature range, the error of the transformer is maintained within the corresponding accuracy level range; it can directly provide various fault information such as disconnection, and the secondary equipment can be blocked for protection after receiving it, simplifying the design; it can receive traditional The analog input of the transformer, the machine completes the analog-to-digital conversion and outputs through the optical fiber Ethernet, and completes the mixed use of the electronic transformer and the traditional transformer; the collector and the combiner are connected through the optical fiber, and the digital signal is transmitted through the optical fiber, which enhances the Anti-EMI performance, data reliability is greatly improved. The electronic transformer has a complete self-inspection function. If there is a communication failure or an electronic transformer failure, the protection device will directly judge the abnormality of the transformer due to incorrect marking or failure to receive the correct data of the check code; solid filling guarantee The stability of the mechanical and electrical properties of the transformer is ensured, and there is no need for pressure and leak detection, and it is maintenance-free during operation. The output is a digital signal, without the traditional concept of secondary load; the photoelectric isolation makes the secondary open circuit of the current transformer and the secondary short circuit of the voltage transformer that may endanger equipment or personal safety no longer exist. The application of cheap fiber optic cables greatly reduces the comprehensive use cost of electronic transformers. In high voltage and ultra-high voltage, the manufacturing cost of electronic transformer has obvious advantages, and the high cost performance is especially obvious.

Explanatory drawings

1. The schematic diagram of the structural principle of the electronic transformer dedicated to HGIS in Fig. 1 in the utility model;

2. The partial cross-sectional structural schematic diagram of the HGIS special electronic transformer in Fig. 2 in the utility model;

3. Figure 3 is a schematic diagram of the external structure of the utility model embodiment;

4. Fig. 4 is a schematic diagram of the internal partial structure in the utility model embodiment;

In the figure: 1-sensing head part, 4-housing, 5-collector, 6-merger, 8-insulating gas, 9-conductor, 11-Rogowski coil, 12-low power current transformer, 13 - capacitance ring, 41 - gas density sensor, 42 - temperature sensor.

specific embodiment

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figures 1 to 4, an electronic transformer dedicated to HGIS includes a bushing shell 4, a conductor 9 in the bushing shell 4, and a sensor component 1 in the bushing shell 4;

The sensor head part 1 in the bushing casing 4 includes a capacitor ring 13, a Rogowski coil 11 and a low-power current transformer 12; a capacitor solid insulating medium is set between the capacitor ring 13 and the bushing casing 4, and the insulating medium Insulated with insulating grease. At the same time, the capacitor ring 13 is sleeved on the conductor 9, and an insulating gas 8 is arranged between the capacitor ring 13 and the conductor 9; the Rogowski coil 11 and the low-power current transformer 12 are also sleeved on the conductor 9; the sensing head The component 1 is connected with the collector 5; the collector 5 includes a power supply module and a data processing module. The collector 5 is connected with a combiner 6 through an optical fiber and transmits data. The collector 5 and combiner 6 are powered by DC low-voltage power supply.

A gas density sensor 41 is also provided in the sleeve shell 4; a temperature sensor 42 is provided on the sleeve shell 4.

The sensor head part 1 converts the system voltage and current signals into small voltage signals and transmits them to the collector 5, and the collector 5 converts them into digital signals and transmits them to the combiner 6 through optical fibers, and supplies gas measuring instruments and The use of relay protection devices covers all applications of traditional transformers, especially for AC high voltage, ultra-high voltage, and occasions that require high accuracy and transient characteristics. Wherein the collector 5 and the combiner 6 are powered by DC low-voltage power supply; the transformer is insulated by insulating grease.

The Rogowski coil 11 is used to realize large current transmission, which has the advantages of no magnetic saturation, wide frequency response range, high precision, and good transient characteristics, which is conducive to the realization of new protection principles and improved protection performance; HGIS special electronic current/voltage The transformer is a low-voltage electrical appliance in principle, and there is no high-voltage insulation problem; the working power of the collector 5 unit is supplied by the DC power supply in the control cabinet; the oil or SF6 of the traditional transformer is replaced by insulating grease to avoid oil leakage from the transformer Phenomena such as air leakage; the accuracy of the current protection transformer can reach 5TPE, and the accuracy of the measurement current transformer can meet both 0.1 and 0.2S; the voltage transformer measurement accuracy can reach 0.2, and at the same time realize the protection measurement function; In the whole temperature range, the error of the transformer is maintained within the corresponding accuracy level; it can directly provide various fault information such as disconnection, and the secondary equipment can be blocked for protection after receiving it, simplifying the design; it can receive the analog value of the traditional transformer Input, the machine completes analog-to-digital conversion and outputs through optical fiber Ethernet, and completes the mixed use of electronic transformers and traditional transformers; the collector 5 and combiner 6 are connected through optical fibers, and digital signals are transmitted through optical fibers, which enhances the anti-EMI performance , the data reliability is greatly improved; the electronic transformer has a complete self-test function. If there is a communication failure or an electronic transformer failure, the protection device will be able to directly judge the error due to the wrong label or the failure to receive the correct data of the check code. The transformer is abnormal; the solid filling ensures the stability of the mechanical and electrical properties of the transformer, no need for pressure and leak detection, and maintenance-free during operation. The output is a digital signal, without the traditional concept of secondary load; the photoelectric isolation makes the secondary open circuit of the current transformer and the secondary short circuit of the voltage transformer that may endanger equipment or personal safety no longer exist. The application of cheap fiber optic cables greatly reduces the comprehensive use cost of electronic transformers. In high voltage and ultra-high voltage, the manufacturing cost of electronic transformer has obvious advantages, and the high cost performance is especially obvious.

Claims (7)

1. a HGIS specialized electronic formula mutual inductor, is characterized in that: comprise the electric conductor (9) in socket case (4), socket case (4) and the sensor element (1) in socket case (4); The interior sensing head parts (1) of described socket case (4) comprise electric capacity ring (13), Luo-coil (11) and low power current transformer (12); Be provided with electric capacity solid dielectric insulation between described electric capacity ring (13) and socket case (4), described electric capacity ring (13) is sheathed on electric conductor (9) simultaneously, and is provided with insulating gas (8) between described electric capacity ring (13) and electric conductor (9); Described Luo-coil (11) and low power current transformer (12) are sheathed on electric conductor (9) equally; Described sensing head parts (1) are connected with collector (5); Described collector (5) comprises power module and data processing module.

2. a kind of HGIS specialized electronic formula mutual inductor according to claim 1, is characterized in that: be provided with Gas Density Sensor (41) in described socket case (4).

3. a kind of HGIS specialized electronic formula mutual inductor according to claim 1, is characterized in that: described socket case (4) is provided with temperature sensor (42).

4. a kind of HGIS specialized electronic formula mutual inductor according to claim 1, is characterized in that: described collector (5) is connected with a combiner (6).

5. a kind of HGIS specialized electronic formula mutual inductor according to claim 2, is characterized in that: described collector (5) and combiner (6) are by Fiber connection and transmit data.

6. a kind of HGIS specialized electronic formula mutual inductor according to claim 2, is characterized in that: described collector (5) and combiner (6) adopt DC low voltage power supply to power.

7. a kind of HGIS specialized electronic formula mutual inductor according to claim 1, is characterized in that: the insulating medium between described electric capacity ring (13) and socket case (4) adopts the fat that insulate to insulate.