CN106771469B - Primary and secondary fusion three-phase intelligent current and voltage integrated transformer for power distribution equipment - Google Patents
Primary and secondary fusion three-phase intelligent current and voltage integrated transformer for power distribution equipment Download PDFInfo
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- CN106771469B CN106771469B CN201710147929.0A CN201710147929A CN106771469B CN 106771469 B CN106771469 B CN 106771469B CN 201710147929 A CN201710147929 A CN 201710147929A CN 106771469 B CN106771469 B CN 106771469B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/38—Instruments transformers for polyphase ac
Abstract
A primary and secondary fusion three-phase intelligent current and voltage integrated mutual inductor for power distribution equipment comprises a high-voltage resistor and a primary current and voltage outlet pipe; the three-phase circuit is respectively provided with a current and voltage primary outgoing pipe, a current sampling protection coil, a current sampling measurement coil, a zero-sequence current sampling coil and a zero-sequence signal regulator; six high-voltage resistors, a current sampling zero-sequence coil and a phase sequence signal regulator are further arranged; eight pairs of signals of phase sequence and zero sequence of current and voltage in the three-phase circuit are simultaneously output by the power distribution equipment, namely the first-time and second-time fusion shielding twisted-pair cable. The invention has light weight and small volume. The method has the eight-in-one functions of three-phase current sampling, measurement, protection, zero sequence, three-phase voltage measurement, protection, zero sequence and discharge. The method is applied to a primary and secondary fusion column switch of distribution equipment, and meets the development requirements of digitalization, intellectualization and networking in various fields of the power industry.
Description
The technical field is as follows: the invention relates to the field of distribution network automatic sampling control, in particular to
A primary and secondary integrated three-phase intelligent current and voltage integrated transformer for power distribution equipment.
The background art comprises the following steps: in order to meet the requirement of fine management of the national power grid line loss and realize the distribution network branching line loss measurement, a new requirement needs to be provided for a primary equipment current and voltage sensor so as to meet the requirement of measurement precision. With the rapid development of electronic technology, a microcomputer type relay protection device gradually takes a leading position, and in relay protection and measurement, energy flow and information flow of a control part are separated, so that a monitoring device does not need a transformer with high power output for sampling. Meanwhile, due to the rapid development of the power industry and the more complex power grid condition, the intelligent current-voltage transformer for improving the power factor and the quality of the power grid is widely applied. Due to the particularity of the ZW32 pole-mounted switch, the invention is designed in the very first time for developing a primary and secondary integrated three-phase intelligent current and voltage integrated mutual inductor for power distribution equipment, providing current and voltage acquisition signals for a power distribution terminal FTU/DTU, and having eight-in-one functions of current sampling, measurement, protection, zero sequence and voltage measurement, protection, zero sequence and discharge.
The invention content is as follows: the invention aims to meet the requirement that the power distribution terminal FTU/DTU provides a current and voltage acquisition signal,
the invention has the requirements of eight-in-one functions of current sampling, measurement, protection, zero sequence and voltage measurement, protection, zero sequence and discharge, and the aim of the invention is realized as follows: the utility model provides a distribution equipment fuses three-phase intelligence current-voltage integration mutual-inductor with a secondary, includes that high tension resistance, current-voltage go out spool, current sample protection coil, its characterized in that once: the system is provided with an A-phase circuit, a B-phase circuit, a C-phase circuit and a zero sequence circuit, wherein each phase circuit is provided with a primary current and voltage outlet pipe; one end of the current and voltage primary outgoing pipe of each phase circuit is provided with a current sampling protection coil, the other end of the current and voltage primary outgoing pipe is provided with a current sampling measurement coil and a zero sequence current sampling coil, and a zero sequence signal regulator is correspondingly arranged; four high-voltage resistors are arranged between the phase A circuit and the phase B circuit, and are respectively provided with corresponding phase sequence signal regulators; two high-voltage resistors and current sampling zero-sequence coils are arranged between the B-phase circuit and the C-phase circuit, and a phase sequence signal regulator is arranged; the current and voltage parts in the A phase, B phase and C phase circuits are connected into an integral and zero sequence circuit by a signal regulator circuit, the integral and zero sequence circuit is sealed and insulated by silicon rubber, the integral silicon rubber and the shielding twisted pair cable outlet pipe are respectively penetrated by a first and a second fused shielding twisted pair cables of the distribution equipment to lead out output signals, the first and the second fused shielding twisted pair cables of the distribution equipment adopt sixteen-core paired shielding twisted pair output signals, and the phase sequence of the current and the voltage of the A phase, the B phase and the C phase circuits and eight zero sequence signals are simultaneously output; the APG sealing technology is adopted, the silicon rubber silica gel is used as an insulating material, and the outer surface is molded by one-step casting.
The primary current and voltage outlet pipe connects the phase sequence and the zero sequence of the current and the voltage together and inputs current and voltage signals at the same time.
The current parts in the A-phase circuit, the B-phase circuit and the C-phase circuit adopt low-temperature drift non-inductive metal film resistors to be connected in parallel to output small voltage signals, the temperature drift coefficient is small, the error range of a product is unchanged when the outdoor temperature is between 40 ℃ below zero and 70 ℃, and the anti-interference capability is strong.
The voltage parts in the A-phase, B-phase and C-phase circuits adopt sheet type noninductive high-precision thick film resistor double groups to output small voltage signals, the temperature drift coefficient is small, the error range is unchanged when the outdoor temperature is between 40 ℃ below zero and 70 ℃, and the anti-interference capability is strong; the output of the double groups of output voltage small signals is linear in the whole measuring range, the phase sequence and the zero sequence voltage small signals are ensured to be output separately, the interference and the influence are avoided, and the measurement and the protection signals work independently.
The phase sequence and zero sequence signal regulator adopts a resistance voltage division principle, is provided with a CCXI ceramic dielectric high-voltage capacitor for phase difference regulation, and regulates the dispersion capacitor in the product, so that the phase difference of the product is not interfered by an external electromagnetic field.
The phase sequence signal regulator adopts a 3296W-502 adjustable potentiometer to replace a resistor, so that the ratio difference is adjusted at any time, and the requirement of the ratio difference is met under different load conditions.
The invention has the advantages of light weight, small volume, installation space saving, field wiring reduction, simple structure and excellent performance. The single-phase zero sequence current transformer and the single-phase current transformer which are of independent structures in the prior art and the single-phase voltage transformer which are of independent structures in the prior art are all combined together. By the design of the internal circuit and the shielding of the electromagnetic field, the accuracy and reliability of the sampled data are ensured, and the on-line monitoring and self-diagnosis of all measurement and protection signals are completed. And simultaneously, the function of zero sequence protection is added, and three-phase sequence (protection, measurement and metering) current signals, voltage signals, zero sequence current signals and zero sequence voltage signals are provided. The invention relates to a low-voltage novel transformer for measurement and protection, which is suitable for being matched with an outdoor ZW20 circuit breaker (FZW 28 load switch). The mutual inductor has powerful functions, small signal output does not need secondary conversion, and the mutual inductor can be directly connected into secondary equipment through A/D conversion, thereby meeting the development requirements of digitalization, intellectualization and networking in various fields of power industry, such as control and protection of power grid electrical equipment, state maintenance, electric energy metering, electric energy quality measurement and the like. The measuring range is wide, and the defects of narrow frequency band, slow response and the like of the traditional electromagnetic type sampling device are overcome. The small voltage signal sampling fundamentally eliminates major fault hidden dangers in the operation of the power system, and ensures the safety of personnel and equipment to the greatest extent.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic diagram of the internal bus of the resistive divider of the present invention;
FIG. 4 is a schematic diagram of a phase-sequence signal conditioner circuit;
FIG. 5 is a schematic diagram of a zero sequence signal conditioner circuit;
FIG. 6 is a schematic diagram of a low energy consumption small core coil;
FIG. 7 is a Rogowski (Rogowski) coil schematic;
FIG. 8 is a schematic diagram of a resistor divider;
1. the power distribution equipment comprises a power distribution equipment primary and secondary fusion shielding twisted-pair cable, a shielding twisted-pair cable outlet pipe, 3, integral silicon rubber, 4, a phase sequence signal regulator, 5, a high-voltage resistor, 6, a current and voltage primary outlet pipe, 7, a current sampling protection coil, 8, a zero sequence current sampling coil, 9, a zero sequence signal regulator, 10, a current sampling zero sequence coil and 11, a current sampling measurement coil.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings;
the current sampling measuring coil adopts the principle of a small-energy-consumption iron core coil, and the current sampling protecting coil adopts the principle of a Rogowski (Rogowski) coil. The zero-sequence current sampling adopts the principle of a small-energy-consumption iron core coil, the voltage sampling adopts the principle of high-precision double-group resistance voltage division, and the principles are explained below.
1. The principle of low-energy consumption and small iron core coil is adopted:
the small iron core coil type low-power current transformer is a development of the traditional electromagnetic current transformer, and the principle of the small iron core coil type low-power current transformer is as shown in fig. 6:
the small iron core coil type low-power current transformer comprises a primary winding small iron core and a secondary winding with extremely low loss. The secondary winding is connected to an integration element Ra, and thus, its secondary output is a voltage signal. Secondary current I 2 The voltage drop Us generated across the integration element Ra is proportional in magnitude to the primary current and in phase. Furthermore, in the case of a liquid crystal display,the smaller the secondary power required by the internal loss and load of the transformer, the wider the measurement range and the higher the accuracy.
2. The Rogowski (Rogowski) coil principle is used:
a Rogowski coil as shown in fig. 7 is formed by uniformly winding a conductive wire around a non-ferromagnetic annular bobbin with a primary bus bar placed at the center of the coil, so that the potential between the winding coil and the bus bar is isolated. Since there is no core, there is no saturation phenomenon. If the bus current is I (t),
induced potential e (t) generated across a Rogowski (Rogowski) coil according to faraday's law of electromagnetic induction: e (t) = -Mdi/dt
Wherein M-mutual inductance coefficient
And the induced potential e (t) generated at the two ends of the Rogowski coil is processed by an integrator to obtain a voltage signal proportional to the bus current, and then the voltage signal is processed and converted by other links to obtain an analog quantity output proportional to the primary current.
3. The principle of a resistance voltage divider is adopted:
electronic voltage transformer adopts resistance voltage division principle, and its output of internal resistance is linear in whole measuring range, and its principle is as shown in figure 8: in the figure, 1 is a voltage-sharing electrode; ra-high arm resistance; rb-Low Voltage arm resistance.
The principle converts the primary high voltage into the low voltage, and outputs the secondary voltage which meets the standard after being processed. Tv is an overvoltage protection device that can limit the secondary voltage rise protection measurement system once Rb damage occurs.
In specific implementation, the high-voltage resistor is a primary resistor of voltage, three current sampling measurement coils and one current sampling zero-sequence coil. Two-way output, wherein the primary resistor is two ways and is combined into one terminal input, the secondary resistor is two ways and is output independently to form two ways with two resistance ratios, and two ways of small voltage signals are output; three-phase six-path output, another three-path output is combined into one-path output, just four-path output is formed, three phase sequences are added with one zero sequence, namely three-path phase sequences are independent, and the three zero sequences are gathered into one-path signals because the zero-sequence voltages of the A, B and C phases are just 120 degrees of sine waves; four lines of sixteen output signals of the invention are zero sequences, and the signs are as follows: ia +, ia-, ib +, ib-, ic +, ic-In +, in-, ua +, ua-, ub +, ub-, uc +, uc-, un +, un-,
the outer ring whole shielding layer of the sixteen wires is just grounded.
The primary current and voltage outlet pipe is used for connecting the phase sequence of current and voltage with the zero sequence, current and voltage signals are input at the same time, the primary current and voltage outlet pipe plays a role in shielding a primary electric field and a primary magnetic field, the local discharge amount of a product is ensured to be small, no discharge exists in an internationally specified range, in addition, the primary current and voltage outlet pipe plays a role in reducing distributed capacitance, and the phase difference of voltage output signals is ensured to be small.
The current parts in the circuits of the A phase, the B phase and the C phase adopt low temperature drift non-inductive metal film resistors to output small voltage signals in parallel, the temperature drift coefficient of the product is small, the error range of the product is unchanged when the outdoor temperature is between 40 ℃ below zero and 70 ℃, and the anti-jamming capability is strong.
The voltage parts in the A-phase, B-phase and C-phase circuits adopt sheet type non-inductive high-precision thick film resistor double-group output voltage small signals, the temperature drift coefficient of the product is small, the error range of the product is almost unchanged when the product works outdoors at-40 ℃ to +70 ℃, and the anti-interference capability is strong. The double groups output the voltage small signals, ensure that the phase sequence and the zero sequence voltage small signals are output separately, do not interfere with each other, do not influence each other, measure and protect the independent work of the signal, have guaranteed that the performance of the product is more reliable.
The signal regulator adopts the resistance voltage division principle, is provided with CCXI class ceramic medium high-voltage capacitor to carry out the phase difference and adjusts the dispersion capacitance in the product, has guaranteed that the product phase difference is disturbed very little by external electromagnetic field.
The phase sequence signal regulator adopts a 3296W-502 adjustable potentiometer to replace a resistor, so that the invention can adjust the ratio difference at any time and can meet the requirement of the ratio difference under different load conditions.
The sixteen-core paired shielding twisted pair is adopted to output signals, and the simultaneous output of eight pairs of signals of phase sequence and zero sequence of all current and voltage of the product is ensured.
The invention integrates eight functions of three-phase current sampling, measurement, protection, zero sequence, three-phase voltage measurement, protection, zero sequence and discharge through intelligent combination of internal circuits. The switch is applied to a primary and secondary fusion pole switch of distribution equipment. Really realizes the deep fusion of the first time and the second time.
The inside spare part of whole product is arranged in order, and the electromagnetic field interference is avoided in the intelligent combination, exports eight voltage small signal simultaneously, each other noninterference. The function is stronger than three phase sequence mutual inductors, three zero sequence current transformers, three phase sequence voltage mutual inductors, three zero sequence voltage mutual inductors and three discharge coils, and the performance is more superior.
The invention achieves the following service performances:
1. ambient temperature: -40 ℃ to +70 ℃.
2. Altitude: not exceeding the Under 1000 m.
3. No obvious dirt such as dust, smoke, corrosive gas, steam or salt and the like exists in the ambient air.
4. Relative humidity: the average value of the relative humidity measured within 24h must not exceed 95%.
5. The current-voltage integrated sensor allows long-term operation at 1.2 times rated current and voltage.
The current part of the invention can be used for zero sequence, measurement and protection through electromagnetic induction and high-precision resistance sampling; the voltage part can be used for zero sequence, measurement, protection and discharge through high-precision double-group resistance sampling, the two parts are integrally sealed and insulated by silicon rubber, secondary wiring is connected with the outside through a sixteen-core aviation plug, an output signal can be connected with a sixteen-core shielding paired twisted-pair cable with the length of 15 meters in parallel, and the tail end precision is unchanged. The output of the product is a small voltage signal, the controlled equipment can not be damaged, and the product can be directly interfaced with secondary comprehensive automatic equipment such as instruments and relay protection devices, so that eight-in-one functions of current sampling, measurement, protection, zero sequence and voltage measurement, protection, zero sequence and discharge are realized. The multifunctional electric water heater has complete functions, is simple and convenient to install and use, reduces energy consumption in operation, and does not need equipment maintenance.
Claims (6)
1. The utility model provides a distribution equipment fuses three-phase intelligence current-voltage integration mutual-inductor with a secondary, includes high tension resistance (5), current-voltage and once goes out spool (6), current sampling protection coil (7), its characterized in that: the power supply is provided with an A-phase circuit, a B-phase circuit, a C-phase circuit and a zero sequence circuit, wherein each phase circuit is provided with a current and voltage primary outgoing pipe (6); one end of the current and voltage primary outgoing pipe (6) of each phase circuit is provided with a current sampling protection coil (7), the other end of the current and voltage primary outgoing pipe is provided with a current sampling measurement coil (11) and a zero sequence current sampling coil (8), and a zero sequence signal regulator is correspondingly arranged; four high-voltage resistors are arranged between the A-phase circuit and the B-phase circuit, and are respectively provided with corresponding phase sequence signal regulators; two high-voltage resistors and current sampling zero-sequence coils (10) are arranged between the B-phase circuit and the C-phase circuit, and a phase sequence signal regulator (4) is arranged; the current and voltage parts in the A-phase, B-phase and C-phase circuits are connected into an integral and zero-sequence circuit by adopting a signal regulator circuit, the integral and zero-sequence circuit is sealed and insulated by using silicon rubber, the integral and zero-sequence circuit is respectively penetrated through integral silicon rubber (3) and a shielded twisted-pair cable outlet pipe (2) by a first-time and second-time fusion shielded twisted-pair cable (1) of the power distribution equipment to lead out output signals, and the first-time and second-time fusion shielded twisted-pair cable (1) of the power distribution equipment adopts sixteen cores to shield twisted-pair output signals in pairs, so that the phase sequence of the current and the voltage of the A-phase, B-phase and C-phase circuits and eight zero-sequence signals are simultaneously output; the APG sealing technology is adopted, the silicon rubber silica gel is used as an insulating material, and the outer surface is molded by one-step casting.
2. The primary-secondary fusion three-phase intelligent current-voltage integrated transformer for the power distribution equipment according to claim 1, characterized in that: the current and voltage primary outgoing line pipe (6) connects the phase sequence and the zero sequence of the current and the voltage together, and inputs current and voltage signals simultaneously.
3. The primary-secondary fusion three-phase intelligent current-voltage integrated transformer for the power distribution equipment according to claim 1, characterized in that: the current parts in the A-phase circuit, the B-phase circuit and the C-phase circuit adopt low-temperature drift non-inductive metal film resistors to be connected in parallel to output small voltage signals, the temperature drift coefficient is small, the error range of a product is unchanged when the outdoor temperature is between 40 ℃ below zero and 70 ℃, and the anti-interference capability is strong.
4. The primary-secondary fusion three-phase intelligent current-voltage integrated transformer for the power distribution equipment according to claim 1, characterized in that: the voltage parts in the A-phase, B-phase and C-phase circuits adopt sheet type noninductive high-precision thick film resistor double groups to output small voltage signals, the temperature drift coefficient is small, the error range is unchanged when the outdoor temperature is between 40 ℃ below zero and 70 ℃, and the anti-interference capability is strong; the output of the double-group output voltage small signals is linear in the whole measuring range, the phase sequence and the zero sequence voltage small signals are ensured to be output separately, the interference and the influence are avoided, and the measurement and the protection signals work independently.
5. The primary-secondary fusion three-phase intelligent current-voltage integrated transformer for the power distribution equipment according to claim 1, characterized in that: the phase sequence and zero sequence signal regulator adopts a resistance voltage division principle, is provided with a CCXI ceramic dielectric high-voltage capacitor for phase difference regulation, and regulates the dispersion capacitor in the product, so that the phase difference of the product is not interfered by an external electromagnetic field.
6. The intelligent current-voltage integrated transformer for the primary and secondary fusion three phases of the power distribution equipment as claimed in claim 1 or 5, wherein: the inside of the phase sequence and zero sequence signal regulator adopts a 3296W-502 adjustable potentiometer to replace a resistor, the ratio difference is adjusted at any time, and the requirement of the ratio difference is met under different load conditions.
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| CN108918945A (en) * | 2018-05-22 | 2018-11-30 | 上海置信电气股份有限公司 | One secondary deep of one kind fusion voltage sensor and its design technology method |
| CN109030909A (en) * | 2018-07-13 | 2018-12-18 | 北京和信瑞通电力技术股份有限公司 | A kind of distribution one or two times fusions three-phase resistance reactance divided voltage sensor |
| CN109188042A (en) * | 2018-07-13 | 2019-01-11 | 北京和信瑞通电力技术股份有限公司 | A kind of distribution one or two times fusions three-phase thin-film capacitor divided voltage sensor |
| CN108802478B (en) * | 2018-08-16 | 2023-12-22 | 江苏靖江互感器股份有限公司 | Capacitive external voltage sensor for breaker switch |
| CN108710020B (en) * | 2018-08-16 | 2023-12-08 | 江苏靖江互感器股份有限公司 | Energy-taking and measuring capacitive dual voltage sensor for power distribution equipment |
| CN109521235A (en) * | 2018-11-27 | 2019-03-26 | 国网江苏省电力有限公司电力科学研究院 | The complete accuracy checking method of one or two fusion switchgears of one kind and system |
| CN110568244A (en) * | 2019-09-25 | 2019-12-13 | 中互(杭州)电子科技有限公司 | Primary and secondary fusion voltage and current integrated sensor |
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| CN205017016U (en) * | 2015-10-17 | 2016-02-03 | 国网福建省电力有限公司 | Communication type low voltage network not balanced load synthesizes adjustment system |
| CN106199118B (en) * | 2016-07-22 | 2022-10-11 | 浙江天际互感器有限公司 | Capacitor voltage-dividing type zero sequence voltage transformer with power output |
| CN205898869U (en) * | 2016-07-25 | 2017-01-18 | 浙江天际互感器有限公司 | Take zero sequence voltage output's resistive voltage divider formula three -phase combination voltage transformer |
| CN106205989A (en) * | 2016-09-28 | 2016-12-07 | 江苏靖江互感器股份有限公司 | A kind of controller switching equipment is with one or two fusion threephase current transformers |
| CN206906454U (en) * | 2017-03-14 | 2018-01-19 | 江苏靖江互感器股份有限公司 | One or two fusion three-phase intelligent Current Voltage integration transformers of controller switching equipment |
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