CN2901529Y - Electronic voltage mutual inductor - Google Patents
Electronic voltage mutual inductor Download PDFInfo
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- CN2901529Y CN2901529Y CNU200620033736XU CN200620033736U CN2901529Y CN 2901529 Y CN2901529 Y CN 2901529Y CN U200620033736X U CNU200620033736X U CN U200620033736XU CN 200620033736 U CN200620033736 U CN 200620033736U CN 2901529 Y CN2901529 Y CN 2901529Y
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Abstract
本实用新型提供一种电子式电压互感器，包括绝缘体，嵌入绝缘体内的一次端子、下嵌件、互感器主体及辅助电路板。其中，互感器主体由上屏蔽罩及下屏蔽罩，设置在上、下屏蔽罩之间的高压电阻、低压电阻、自恢复保护管构成的互感器主体电路组成。互感器主体电路的连接关系是高压电阻一端接一次端子，低压电阻与自恢复保护管并联后一端接高压电阻另一端和辅助电路板，并联后另一端接下嵌件和辅助电路板。体积小，重量轻；测量范围为80％～120％Un，线性度好，精度可达0.2准确级，运行可靠，可直接与微机测量保护装置联接。主要用于电力系统中的电压测量及继电保护。
The utility model provides an electronic voltage transformer, which comprises an insulator, a primary terminal embedded in the insulator, a lower insert, a transformer main body and an auxiliary circuit board. Wherein, the transformer main body is composed of an upper shielding cover and a lower shielding cover, and a transformer main body circuit composed of a high-voltage resistor, a low-voltage resistor, and a self-restoring protection tube arranged between the upper and lower shielding covers. The connection relationship of the main circuit of the transformer is that one end of the high-voltage resistor is connected to the primary terminal, the low-voltage resistor is connected in parallel with the self-recovery protection tube, and one end is connected to the other end of the high-voltage resistor and the auxiliary circuit board, and the other end is connected to the lower insert and the auxiliary circuit board after parallel connection. Small size, light weight; measuring range is 80% ~ 120% Un, good linearity, accuracy can reach 0.2 accuracy level, reliable operation, can be directly connected with the computer measuring protection device. It is mainly used for voltage measurement and relay protection in power system.
Description
技术领域technical field
本实用新型涉及一种电力系统中的电压测量和继电保护装置，特别是涉及一种电子式电压互感器。The utility model relates to a voltage measurement and relay protection device in an electric power system, in particular to an electronic voltage transformer.
背景技术Background technique
在电力系统中电压的测量和继电保护大都采用常规的电磁式电压互感器。该种互感器存在的缺点是结构复杂，体积大，频带窄，发生磁饱和时二次信号波形畸变，测量误差大，容易导致继电器保护装置误动作。同时，随着以微处理器为基础的新技术在电力系统中的广泛应用，使得常规的电磁式电压互感器的二次输出不再需要100/√3或100/3的电压，而是几伏的电压信号，因此常规的电磁式电压互感器很难满足电力系统技术要求，电磁式电压互感器的这些缺点制约了电力系统向智能化、数字化、网络化、设备小型化及多功能化方向发展。Conventional electromagnetic voltage transformers are mostly used for voltage measurement and relay protection in power systems. The shortcomings of this kind of transformer are complex structure, large volume, narrow frequency band, secondary signal waveform distortion when magnetic saturation occurs, large measurement error, and easy to cause malfunction of relay protection device. At the same time, with the widespread application of new technologies based on microprocessors in power systems, the secondary output of conventional electromagnetic voltage transformers no longer requires a voltage of 100/√3 or 100/3, but several Therefore, the conventional electromagnetic voltage transformer is difficult to meet the technical requirements of the power system. These shortcomings of the electromagnetic voltage transformer restrict the direction of the power system to be intelligent, digital, networked, equipment miniaturized and multifunctional. develop.
发明内容Contents of the invention
本实用新型的目的在于克服上述缺点，提供一种体积小、重量轻、测量范围宽、精度高、运行可靠，可直接与微机测量保护装置联接的电子式电压互感器。The purpose of this utility model is to overcome the above shortcomings and provide an electronic voltage transformer with small size, light weight, wide measurement range, high precision, reliable operation, and can be directly connected with a microcomputer measurement protection device.
本实用新型电子式电压互感器包括绝缘体，嵌入绝缘体内的一次端子、下嵌件、互感器主体及辅助电路板。其中，互感器主体由上屏蔽罩及下屏蔽罩，设置在上、下屏蔽罩之间由高压电阻、低压电阻、自恢复保护管构成的互感器主体电路组成。互感器主体电路的连接关系是高压电阻一端接一次端子，低压电阻与自恢复保护管并联后一端接高压电阻另一端和辅助电路板，并联后另一端接下嵌件和辅助电路板，下嵌件接地。上屏蔽罩设置在一次端子与高压电阻之间，下屏蔽罩设置在低压电阻、自恢复保护管与下嵌件之间。其中上屏蔽罩和下屏蔽罩作为电场均匀的电容，既能使互感器中电场均匀性得到改善，又起到电容补偿的作用。高压电阻和低压电阻形成分压电路，从低压电阻上可得到一个很低的电压信号。自恢复保护管一般采用气体放电管，可在电网受到瞬间冲击时，自动击穿，而后又自动恢复，对后阶电路起到自动保护作用；辅助电The electronic voltage transformer of the utility model comprises an insulator, a primary terminal embedded in the insulator, a lower insert, a transformer main body and an auxiliary circuit board. Wherein, the main body of the transformer is composed of an upper shielding cover and a lower shielding cover, and a main transformer circuit composed of a high-voltage resistor, a low-voltage resistor, and a self-restoring protection tube is arranged between the upper and lower shielding covers. The connection relationship of the main circuit of the transformer is that one end of the high-voltage resistor is connected to the primary terminal, one end of the low-voltage resistor is connected in parallel with the self-recovery protection tube, and one end is connected to the other end of the high-voltage resistor and the auxiliary circuit board, and the other end is connected to the lower insert and the auxiliary circuit board after parallel connection. parts grounded. The upper shielding cover is arranged between the primary terminal and the high voltage resistor, and the lower shielding cover is arranged between the low voltage resistor, the self-restoring protection tube and the lower insert. The upper shield and the lower shield serve as capacitors with uniform electric field, which can not only improve the uniformity of the electric field in the transformer, but also play the role of capacitance compensation. The high-voltage resistor and the low-voltage resistor form a voltage divider circuit, and a very low voltage signal can be obtained from the low-voltage resistor. The self-recovery protection tube generally adopts a gas discharge tube, which can automatically break down when the power grid is subjected to an instantaneous impact, and then automatically recover, which automatically protects the subsequent circuit; the auxiliary circuit
路板电路包括阻抗变换电路、相位补偿电路及比例调整电路，其连接关系是阻抗变换电路输出接相位补偿电路输入，相位补偿电路输出接比例调整电路输入。其中，阻抗变换电路由电阻R3、放大器IC1构成；相位补偿电路由电阻R4和R5、可变电阻R6、电容C1及放大器IC2构成；比例调整电路由电阻R7、R9和R10、可变电阻R8及放大器IC3构成。该辅助电路板主要用于对互感器主体电路的二次输出作必要的调整，以保证其二次输出能准确反映一次电压情况。The circuit board circuit includes an impedance conversion circuit, a phase compensation circuit and a ratio adjustment circuit, and the connection relationship is that the output of the impedance conversion circuit is connected to the input of the phase compensation circuit, and the output of the phase compensation circuit is connected to the input of the ratio adjustment circuit. Among them, the impedance conversion circuit is composed of resistor R 3 and amplifier IC 1 ; the phase compensation circuit is composed of resistors R 4 and R 5 , variable resistor R 6 , capacitor C 1 and amplifier IC 2 ; the proportional adjustment circuit is composed of resistor R 7 , R 9 and R 10 , variable resistor R 8 and amplifier IC 3 form. The auxiliary circuit board is mainly used to make necessary adjustments to the secondary output of the main circuit of the transformer, so as to ensure that the secondary output can accurately reflect the primary voltage.
本实用新型电子式电压互感器的工作原理是，一次高电压加在一次端子上，经过高压电阻和低压电阻进行分压，从低压电阻上得到一个很低的电压，经辅助电路再进行调整，输出一个与一次高压成线性关系的低电压信号，该低电压信号经双层屏蔽电缆传递到信号采集处理单元，用以电压测量和实施微机继电保护。辅助电路板的工作原理是对互感器主体电路输出的低电压信号进行衰减，使其与一次高电压成严格的线性关系，然后进行相位补偿及比例调整后输出二次低电压信号，通过检测二次低电压信号了解一次高电压的状况。The working principle of the electronic voltage transformer of the utility model is that a high voltage is applied to the primary terminal, and the voltage is divided through the high-voltage resistor and the low-voltage resistor, and a very low voltage is obtained from the low-voltage resistor, and then adjusted by the auxiliary circuit. Output a low-voltage signal that is linearly related to the primary high voltage, and the low-voltage signal is transmitted to the signal acquisition and processing unit through a double-layer shielded cable for voltage measurement and microcomputer relay protection. The working principle of the auxiliary circuit board is to attenuate the low-voltage signal output by the main circuit of the transformer, so that it has a strict linear relationship with the primary high voltage, and then output the secondary low-voltage signal after phase compensation and proportional adjustment. The sub-low voltage signal understands the status of the primary high voltage.
本实用新型电子式电压互感器的优点在于体积小、重量轻，无二次绕组也能同时满足电力系统计量和保护要求；测量范围为80％～120％Un，线性度好，精度可达0.2准确级，且不存在饱和；运行可靠，无谐振，无爆炸或开裂情况；输出低功率电压信号，可直接与微机测量保护装置连接，从而简化了微机测量保护装置的结构，降低系统成本。The electronic voltage transformer of the utility model has the advantages of small size and light weight, and can meet the measurement and protection requirements of the power system without secondary windings; the measurement range is 80% to 120% Un, the linearity is good, and the accuracy can reach 0.2 Accurate level, and no saturation; reliable operation, no resonance, no explosion or cracking; output low power voltage signal, can be directly connected to the microcomputer measurement protection device, thus simplifying the structure of the microcomputer measurement protection device and reducing system cost.
附图说明Description of drawings
图1：本实用新型结构示意图Figure 1: Structural schematic diagram of the utility model
图2：本实有新型电路连接图Figure 2: This real new circuit connection diagram
具体实施方式Detailed ways
本实用新型电子式电压互感器包括绝缘体2，一次端子1、下嵌件8、嵌入绝缘体2内的互感器主体及辅助电路板11。其中，互感器主体由上屏蔽罩3及下屏蔽罩5，设置在上屏蔽罩3及下屏蔽罩5之间由高压电阻4、低压电阻7及气体放电管6构成的互感器主体电路组成，互感器主体电路的连接关系是高压电阻4一端接一次端子1，低压电阻7与气体放电管6并联后一端接高压电阻4另一端和辅助电路板11，并联后另一端接下嵌件8和辅助电路板11。辅助电路板11的电路包括阻抗变换电路、相位补偿电路及比例调整电路，其连接关系是阻抗变换电路输出接相位补偿电路输入，相位补偿电路输出接比例调整电路输入。其中，阻抗变换电路由电阻R3、放大器IC1(OP07)构成；相位补偿电路由电阻R4和R5、可变电阻R6、电容C1及放大器IC2(OP07)构成；比例调整电路由电阻R7、R9和R10、可变电阻R8及放大器IC3(OP07)构成。其连接关系是R3一端接低压电阻7和气体放电管6并联后一端，另一端接IC1正输入端，IC1负输入端和输出端接R4一端，R4另一端接C1、R5一端和IC2负输入端，C1另一端和R6一端接IC2正输入端，R5另一端接IC2输出端和R7一端，R7另一端接R8一端和IC3负输入端，R8另一端接IC3输出端和R10一端，R10另一端为二次低电压输出端，R6另一端接低压电阻7与气体放电管6并联后另一端和R9一端，R9另一端接IC3正输入端。The electronic voltage transformer of the utility model comprises an
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200620033736XU CN2901529Y (en) | 2006-04-07 | 2006-04-07 | Electronic voltage mutual inductor |
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| CNU200620033736XU CN2901529Y (en) | 2006-04-07 | 2006-04-07 | Electronic voltage mutual inductor |
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| CN2901529Y true CN2901529Y (en) | 2007-05-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102637516A (en) * | 2012-04-27 | 2012-08-15 | 南京南瑞继保电气有限公司 | Shielding barrel used for GIS (Geographic Information System) electronic type current mutual inductor |
| CN102738787A (en) * | 2011-04-08 | 2012-10-17 | 上海电力设计院有限公司 | Device for implementing voltage juxtaposition on secondary circuit of electronic voltage transformer |
| CN103558435A (en) * | 2013-11-04 | 2014-02-05 | 国网上海市电力公司 | 35kV broadband electronic type voltage transformer |
| CN104620114A (en) * | 2012-08-03 | 2015-05-13 | Abb技术股份公司 | Voltage measurement device with an insulating body |
-
2006
- 2006-04-07 CN CNU200620033736XU patent/CN2901529Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738787A (en) * | 2011-04-08 | 2012-10-17 | 上海电力设计院有限公司 | Device for implementing voltage juxtaposition on secondary circuit of electronic voltage transformer |
| CN102738787B (en) * | 2011-04-08 | 2015-12-09 | 上海电力设计院有限公司 | Realize the device of parallel secondary loop voltage of electronic voltage transformer |
| CN102637516A (en) * | 2012-04-27 | 2012-08-15 | 南京南瑞继保电气有限公司 | Shielding barrel used for GIS (Geographic Information System) electronic type current mutual inductor |
| CN104620114A (en) * | 2012-08-03 | 2015-05-13 | Abb技术股份公司 | Voltage measurement device with an insulating body |
| CN104620114B (en) * | 2012-08-03 | 2018-08-17 | Abb瑞士股份有限公司 | Voltage measuring apparatus with insulator |
| CN103558435A (en) * | 2013-11-04 | 2014-02-05 | 国网上海市电力公司 | 35kV broadband electronic type voltage transformer |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 610039 Chengdu, Sichuan, Jinniu District Co-patentee after: SEAC Group Co., Ltd. Patentee after: Xihua University Address before: 610039 Chengdu, Sichuan, Jinniu District Co-patentee before: Sichuan Electrical Equipment Co., Ltd. Patentee before: Xihua University |
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| CX01 | Expiry of patent term |
Granted publication date: 20070516 |
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| EXPY | Termination of patent right or utility model |