CN203324347U - Electronic transformer - Google Patents
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- CN203324347U CN203324347U CN2013202948419U CN201320294841U CN203324347U CN 203324347 U CN203324347 U CN 203324347U CN 2013202948419 U CN2013202948419 U CN 2013202948419U CN 201320294841 U CN201320294841 U CN 201320294841U CN 203324347 U CN203324347 U CN 203324347U
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Abstract
The embodiment of the utility model provides an electronic transformer. The electronic transformer comprises a sensing head, a collector and a merging unit, wherein the collector is connected with the sensing head through a shielded cable and is installed at a ground potential side of the electronic transformer, the correction coefficient of the collector is dynamically adjusted according to the performance of a sensor to enable the collector to match the sensing head, and an input signal is sampled by a sampling system to obtain a digital signal which is output to the merging unit through an optical fiber. According to the electronic transformer provided by the embodiment of the utility model, seamless connection and no-accuracy-loss exchange between an electronic collection unit and a sensing unit are realized, the maintenance process is simplified, the maintenance of the electronic collection unit is more convenient, maintenance and operation costs are reduced, the service life of an electronic circuit is prolonged, and the electronic transformer which is safe and reliable, long in service life and easy in maintenance is provided for a smart power grid.
Description
Technical field
The utility model relates to the mutual inductor technical field, relates in particular to a kind of electronic mutual inductor.
Background technology
Tradition transformer station faces dynamic measurement scope such as routine transformer and has limitation, lacks unified information model and information exchange model and electric network information shared be difficult to realize, lacked between smart machine interoperability, a large amount of secondary cable problems such as adverse effect to reliability.Intelligent substation is the developing direction of transformer station's technology, is construction basis and the important component part of strong intelligent grid, and applying that the transformer technology is intelligent substation laid a good foundation.
Electronic voltage based on the optics and electronics principle, current transformer (respectively referred to as EVT and the ECT) advantage unique with it through the development of more than 30 years, become the measuring equipment of voltage, electric current under the most rising a kind of ultra-high pressure condition.Early stage electronic mutual inductor primary side and secondary side carry out signal transmission by optical fiber, also referred to as the photo-electric mutual inductor.2002, IEC, according to the development trend of new-style electronic voltage, current transformer, formulated about the IEC60044-7 standard of EVT and the IEC644-8 standard of ECT, clear and definite definition and the corresponding technical manual of electronic mutual inductor.
According to the IEC60044-7 standard, EVT adopts resitstance voltage divider, and capacitive divider or optical devices, as a converting member, utilize optical fiber as the transmission system between primary transducer and secondary converter.And transmission and the amplification that electron device is made measuring-signal is housed, there is analog quantity voltage output or digital output.According to the IEC60044-5 standard, adopt conventional current mutual inductor Hall element, Rogowski coil or optical devices as a converting member, utilize optical fiber as the transmission system between primary transducer and secondary converter, and transmission and the amplification that electron device is made measuring-signal is housed, there is analog quantity voltage output or digital output.
Electronic mutual inductor mainly comprises sensing head and electronic unit, and above-mentioned electronic unit mainly comprises collector and merge cells.Relatively traditional mutual inductor life-span of above-mentioned electronic unit is short, difficult in maintenance, changes when electronic unit need to be grown the field adjustable that cuts off the power supply, and this has all seriously hindered the Industry Promotion of electronic mutual inductor, and the development process of intelligent substation.Therefore, how to improve the properties of the electronic unit in electronic mutual inductor, the various shortcomings that overcome above-mentioned electronic unit are problem demanding prompt solutions.
The utility model content
Embodiment of the present utility model provides a kind of electronic mutual inductor, to improve the properties of the electronic unit in electronic mutual inductor.
A kind of electronic mutual inductor comprises: sensing head, collector and merge cells,
Described sensing head, be connected with described collector by shielded cable, to described collector, sends input signal;
Described collector, be connected with described merge cells by optical fiber, is installed on the earth potential side of described electronic mutual inductor, and the correction factor of described collector is dynamically adjusted according to the performance of described sensor; By sampling system, described input signal is collected to digital signal, described digital signal is exported to merge cells by optical fiber;
Described merge cells, be connected with described collector by optical fiber, and the digital signal that described collector output is come merges processing, converts Ethernet data to, and described Ethernet data is exported by optical fiber.
The technical scheme provided by above-mentioned embodiment of the present utility model can be found out, the utility model embodiment is by being installed on collector the earth potential side of electronic mutual inductor, dynamically adjust the correction factor of collector according to the performance of sensor, collector and sensing head are complementary, electronics collecting unit and sensing unit seamless link and accuracy free of losses exchange have been realized, when simplifying maintenance procedures, improve the convenience that the electronics collecting unit is safeguarded, reduced maintenance and operating cost.Avoided the severe electromagnetic environment of high-pressure side, extended the life-span in electronic type loop, reduced frequency of maintenance, to intelligent grid, safe and reliable, long-life is provided, is easy to the electronic mutual inductor of safeguarding, for the safe operation of national intelligent grid provides powerful guarantee.
The accompanying drawing explanation
The processing flow chart of the implementation method of a kind of electronic mutual inductor that Fig. 1 provides for the utility model embodiment mono-;
The output frame form schematic diagram of the merge cells in a kind of electronic mutual inductor that Fig. 2 provides for the utility model embodiment mono-;
A kind of APDU frame structure schematic diagram that has connected 8 ASDU that Fig. 3 provides for the utility model embodiment mono-;
The structural representation of a kind of electronic mutual inductor that Fig. 4 provides for the utility model embodiment bis-;
The structural representation of a kind of electronic current mutual inductor based on the Roche principle that Fig. 5 provides for the utility model embodiment bis-;
The structural representation of a kind of electronic type voltage transformer based on the coaxial capacitance voltage divider principle that Fig. 6 provides for the utility model embodiment bis-;
The hardware configuration schematic diagram of a kind of ECVT800E4 series collector that Fig. 7 provides for the utility model embodiment bis-;
The port organization schematic diagram of a kind of ECVT800E4 series collector that Fig. 8 provides for the utility model embodiment bis-;
A kind of ECVT800E4 series electronic formula current transformer outline overall and installing dimensions figure that Fig. 9 provides for the utility model embodiment bis-;
A kind of ECVT800E4 series electronic formula voltage transformer (VT) outline overall and installing dimensions figure that Figure 10 provides for the utility model embodiment bis-.
Embodiment
For ease of the understanding to the utility model embodiment, take several specific embodiments below in conjunction with accompanying drawing and be further explained explanation as example, and each embodiment does not form the restriction to the utility model embodiment.
Embodiment mono-
The utility model embodiment is short serviceable life for the electronic unit collector of electronic mutual inductor, difficult in maintenance, the problem of the sensing head performance parameter property of there are differences, according to electronic loop technology maturation, FPGA(Field Programmable Gate Array, field programmable gate array) reliable, and the advantage that passive transformer for supplying power is convenient, the life-span is long, carry out electronic unit collector and the theoretical research of sensing head configuration conformance of electronic mutual inductor, realize seamless link.
Electronic mutual inductor in the utility model embodiment comprises sensing head, collector and merge cells, this embodiment provide a kind of electronic mutual inductor implementation method treatment scheme as shown in Figure 1, comprise following treatment step:
By the electronic mutual inductor fault analysis is found, the electronic current mutual inductor fault distributes by type: collector failure rate 43.9% is the maximum source of trouble of electronic mutual inductor; Collector, noise, laser powered sensor loop fault account for total failare 56.7%.Therefore, the collector of electronic mutual inductor exists failure rate height and short problem of life-span.The utility model embodiment studies the life-span of improving collector, simplifies maintenance requirement etc., the reliability of using to improve electronic mutual inductor.
The utility model embodiment is in conjunction with the implementation of traditional mutual inductor, collector is installed on to the earth potential side of electronic mutual inductor, realize the station DC power supply, the elimination unreliable problem of laser energy supply and collector be problem difficult in maintenance in high-pressure side, solve the laser module reliability and simplify maintenance scheme, distribute according to fault, directly reduce electronic mutual inductor failure rate 3.2%, improved the maintainability (generally designing below the base of mutual inductor body) of collector.
Collector in the utility model embodiment comprise two-way independently sampling system the input signal from sensing head is gathered; improved the reliability of protection action, met " Q/GDW441-2010 intelligent substation Protection Technology standard " that up-to-date promulgation is netted by state.
Every road sampling system comprises diode, integrating circuit and AD(analog to digital conversion) parts such as circuit, two-way sampling system common buffer, in above-mentioned collector, also comprise: controller, UART (Universal Asynchronous Receiver/Transmitter, Universal Asynchronous Receiver & dispensing device), two employing output ports and a sampling pulse input port.When above-mentioned collector is applied in capacitance-resistance and divides the die mould electronic type voltage transformer, by the backoff algorithm of SF6 state, realize accuracy compensation and gamma correction to sensing head.
Also comprise DC(Direct Current, direct current in above-mentioned collector) and LDO(low dropout regulator, low pressure difference linear voltage regulator), above-mentioned DC and LDO can in the situation that do not connect external power source, carry out self power supply to above-mentioned collector.
The utility model embodiment utilizes the high reliability of FPGA, and the electronic units such as above-mentioned diode, integrating circuit, AD circuit, impact damper, controller and UART are realized by FPGA, and above-mentioned electronic unit all is integrated in a FPGA.
Above-mentioned collector has strong anti-interference ability, takes into full account the relatively severe running environment of process layer on design of hardware and software, takes totally-enclosed cabinet, and the anti-vibration ability of device improves greatly, and external electromagnetic radiation also meets relevant criterion.Each analog channel is taked quarantine measures, eliminates passage and harasses; Optical fiber and digital output antijamming capability is strong, but long-distance transmissions.
The interference free performance of above-mentioned collector is as follows:
(1) radio frequency electromagnetic field radiation immunity experiment: the radio frequency electromagnetic field that to bear the harsh grade stipulated in GB/T17626.3-2006 be the III level disturbs.
(2) fast transient interference test: the fast transient that the harsh grade that meets the GB/T17626.4-2008 regulation is the IV level disturbs.
(3) anti-electrostatic discharging interference test: the anti-electrostatic discharging that the harsh grade that meets the GB/T17626.2-2006 regulation is the IV level disturbs.
(4) power frequency magnetic field immunity experiment: the power frequency magnetic field that the harsh grade that meets the GB/T17626.8-2006 regulation is the V level disturbs.
(5) pulse magnetic field immunity test: the pulsed magnetic field that the harsh grade that meets the GB/T17626.9-1998 regulation is the V level disturbs.
(6) damped oscillation magnetic field immunity experiment: the damped oscillation magnetic interference that the harsh grade that meets the GB/T17626.10-1998 regulation is the V level.
(7) surge immunity test: the surge harassing and wrecking that to meet the harsh grade stipulated in GB/T17626.5-2008 be the IV level.
(8) the conduction interference immunity experiment of radio-frequency field induction: the radio-frequency field induction conduction interference that the harsh grade that meets the GB/T17626.6-2008 regulation is the III level.
(9) voltage dip, interruption in short-term and change in voltage test: should be able to hold assigned voltage in GB/T17626.29-2006 and interrupt for 100ms, voltage dip 40% is the interference test of 1s.
(10) high frequency immunity experiment: the interference test that should be able to bear the harsh grade stipulated in GB/T17626.12-1998 be the III level.
Above-mentioned collector is mainly used in little analog acquisition and the sending function that electronic current mutual inductor based on Luo-coil and capacitance-resistance are divided the die mould electronic type voltage transformer.
Sensing head is connected with collector by shielded cable, realizes the seamless link between sensing head and collector.Above-mentioned shielded cable can be ECVT800L2C type shielded cable.
The correction factor of above-mentioned collector has online dynamically adjustment capability, before electronic mutual inductor dispatches from the factory, for the specific performance of sensing head, dynamically adjusts the correction factor of collector, and collector and sensing head are complementary, and realizes the seamless link of collector and sensing head.Then, the specific performance of the correction factor after the adjustment of described collector and above-mentioned sensing head is carried out to association store.
When collector breaks down, need the on-the-spot outage of staff to change, new collector is connected with described sensing head, inquire about the information of described association store according to the specific performance of described sensing head, obtain the correction factor after the adjustment of described storage, the correction factor after described adjustment is written in described new collector.Thereby the scene of having realized is directly changed without debugging, realize that the precision of electronic mutual inductor is harmless.
The output format of above-mentioned collector is standard UART, and the digital signal obtained is exported to merge cells by optical fiber.ECVT800E4 series collector has the high measurement accuracy of 0.1 grade.
Communication protocol between above-mentioned collector and merge cells following (asynchronous system transmission)
(1) data communication between collector and merge cells is with reference to the regular length frame format of the FT3 of GB/T18657.1, and the data transmission frame format is shown in following table 1.
(2) should adopt multimode optical fiber between collector and merge cells, high-order (corresponding UART spare bits) is defined as " optical fiber goes out ", and low level is defined as " optical fiber is bright ".Transfer rate is 2.0M bit/s or its integral multiple.Sampling rate is 4000Hz.Fibre-optical splice should adopt ST or FC joint.
(3) adopt industrial standard UART circuit to carry out the asynchronous data stream communication.Each character forms by 11, and 1 start bit is " 0 ", 8 data bit, and 1 even parity bit, 1 position of rest is " 1 ".
Table 1
The merge cells digital signal that output is come to collector merges processing; and become Ethernet data by the IEC61850-9-2 standard handovers; output to process-level network or relevant intelligent electronic device by optical fiber again, meet the requirement of intelligent substation protection, observing and controlling, metering.
The technical indicator of merge cells is as follows:
(1) specified DC data
220V or 110V, allow variation range: 80%～115%.
(2) power consumption
Be not more than 20W.
(2) collector access
Data protocol: follow the Asynchronous Transfer Mode in power industry standard " merge cells technical conditions ";
Fiber type: 62.5/125um, multimode, ST interface;
Optical wavelength: 850nm;
Receiving sensitivity :-30dbm.
(3) switching value access
The dumb contact access, maximum way 9 tunnels;
Input voltage: DC220V/100V.
(4) IEC61850-9-2 form sampled value output
Data protocol: follow the IEC61850-9-2 standard.
Interface type: fiber optic Ethernet, bandwidth 10M/100M;
Fiber type: 62.5/125um, multimode, ST interface;
Optical wavelength: 1310nm;
Receiving sensitivity :-30dbm.
(5) configuration interface
Electric Ethernet, RJ45 interface, bandwidth 10M/100M self-adaptation.
(6) synchronous base access
The method of synchronization: support synchronizing pulse or IRIG-B code or IEC61588-2009(IEEE1588-2008) PTP agreement;
Input mode: fiber optic Ethernet or light serial ports; 62.5/125um, multimode, ST interface;
Optical wavelength: fiber optic Ethernet, 1310nm; The light serial ports, 850nm;
Second is the time accuracy on edge on time: be better than 1us.
The anti-electrical Interference ability of merge cells is as follows:
The static discharge that the harsh grade that can bear table 1 regulation in GB/T17626.2-2006 is 4 grades.
The radio frequency electromagnetic field radiation that the harsh grade that can bear table 1 regulation in GB/T17626.3-2006 is 3 grades.
The electrical fast transient (eft) that the harsh grade that can bear table 1 regulation in GB/T17626.4-2008 is 4 grades disturbs.
The surge impact that the harsh grade that can bear table 1 regulation in GB/T17626.5-2008 is 3 grades disturbs.
The conduction interference of the radio-frequency field induction that the harsh grade that can bear table 1 regulation in GB/T17626.6-2008 is 3 grades disturbs.
The power frequency magnetic field that the harsh grade that can bear table 1 regulation in GB/T17626.8-2006 is 5 grades disturbs.
The pulsed magnetic field that the harsh grade that can bear table 1 regulation in GB/T17626.9-1998 is 5 grades disturbs.
The damped oscillation magnetic interference that the harsh grade that can bear table 1 regulation in GB/T17626.10-1998 is 4 grades.
100kHz and 1MHz pulse train that the harsh grade that can bear table 2 regulation in GB/T17626.12-1998 is 3 grades disturb.
The supply voltage bust that the classification that can bear table 1 regulation in GB/T17626.11-2008 is 3 classes and interruption are in short-term disturbed.
The insulating property of merge cells are as follows:
Dielectric strength, all circuit of merge cells can tolerate and exchange 50Hz with the dielectric strength of shell, and voltage 2kV (effective value) last the 1min test, and naked punctures or the flashover phenomenon.
Surge voltage, the current-carrying part of merge cells is between the non-conductive metal part shell exposed, and under the test atmosphere of regulation, the standard lightning wave that to tolerate amplitude be 5kV impacts check in short-term.
The mechanical property of merge cells is as follows:
Condition of work, the vibration that the harsh grade that can bear country or industry standard regulation is the I level and shock response check.
Traffic condition, the vibration that the harsh grade that can bear country or industry standard regulation is the I level is durable, impact durable and Collision detection.
The environmental baseline of merge cells is as follows:
Operating ambient temperature :-25 ℃～+ 55 ℃.
The accumulating environment temperature :-40 ℃～+ 70 ℃, do not add energizing quantity under ultimate value, irreversible change does not appear in device, temperature is recovered rear device and should be able to be worked.
Relative humidity: 5%～95%(is without condensation).
Atmospheric pressure: 80kPa～110kPa.
Merge cells is followed the output frame form of IEC61850-9-2LE stipulations, and the schematic diagram of this output frame form as shown in Figure 2.In Fig. 2, TPID=0x8100 in priority flag
Ethernet type is 88-BA
APPID=0x4001～0x7fff
Length: comprise the ethernet type PDU(ProtocolDataUnit started with APPID, protocol Data Unit) at the number of eight interior hytes.
APDU(ApplicationProtocolDataUnit, Application Protocol Data Unit): mapping is provided at APDU and is committed to the former performance that several ASDU was connected into to an APDU of transmit buffer.Be connected to the ASDU(ApplicationServiceDataUnit of an APDU, the application service data cell) number can configure, and relevant with sampling rate.This embodiment provides a kind of APDU frame structure schematic diagram that has connected 8 ASDU as shown in Figure 3.
The output data of merge cells are followed the coefficient of IEC61850-9-2LE stipulations and are adjusted
Require the SMV INT type data of merge cells output according to the IEC61850-9-2LE stipulations, data represent the size of primary current voltage.
The form of output data is as follows:
LSB
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 1mA | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? |
| 10mV | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? | ? |
MSB
The 0th 2 of the lowest order of 32
0Represent 1mA or 10mV, the 31st of most significant digit is sign bit: 0 for+, 1 be-.
The scope that can mean electric current is-arrive+2147kA of 2147kA that numerical value is accurate to 1mA; The voltage range that can mean is-arrive+21474kV of 21474kV that numerical value is accurate to 10mV; Can meet the requirement of electric system fully.
The size of merge cells output primary current voltage is to realize by the passage coefficient of adjusting, and the computing formula of the above-mentioned passage coefficient of adjusting is as follows:
Current channel is used in protection: as a rated current of electronic current mutual inductor is I
1e=600A (effective value), the specified 0x01CF=463 that is output as; Passage coefficient co=(600*1000)/463=1295.89633 (accurately latter 5 of radix point) adjusts.
Measure and to use current channel: as a rated current of electronic current mutual inductor is I
1e=600A (effective value), the specified 0x2D41=11585 that is output as; Passage coefficient co=(600*1000)/11585=51.79111 (accurately latter 5 of radix point) adjusts.
Voltage channel: as a rated current of electronic type voltage transformer is
(effective value), the specified 0x2D41=11585 that is output as; Passage coefficient co=adjusts
(accurately latter 5 of radix point).
Embodiment bis-
The structure of a kind of electronic mutual inductor that this embodiment provides as shown in Figure 4, comprises following unit: sensing head 41, shielded cable 42, collector 43, optical fiber 44 and merge cells 45.
Described sensing head, be connected with described collector by shielded cable, to described collector, sends input signal;
Described collector, be connected with described merge cells by optical fiber, is installed on the earth potential side of electronic mutual inductor, according to the performance of described sensor, dynamically adjusts the correction factor of described collector, and described collector and described sensing head are complementary; By sampling system, described input signal is collected to digital signal, described digital signal is exported to merge cells by optical fiber;
Described merge cells, the digital signal that described collector output is come merges processing, converts Ethernet data to, and described Ethernet data is exported by optical fiber.
The collector of the ECVT800E4 series electronic formula mutual inductor that the utility model embodiment provides is mainly used in little analog acquisition and the sending function that electronic current mutual inductor based on Luo-coil and capacitance-resistance are divided the die mould electronic type voltage transformer.As shown in Figure 5, a kind of structural representation of the electronic type voltage transformer based on the coaxial capacitance voltage divider principle as shown in Figure 6 for the structural representation of a kind of electronic current mutual inductor based on the Roche principle that this embodiment provides.
The hardware structure diagram of a kind of above-mentioned ECVT800E4 series collector that this embodiment provides as shown in Figure 7; comprise two-way independently sampling system the input signal from sensing head is gathered; improved the reliability of protection action, met " Q/GDW441-2010 intelligent substation Protection Technology standard " that up-to-date promulgation is netted by state.
Every road sampling system comprises diode, integrating circuit and AD(analog to digital conversion) parts such as circuit, two-way sampling system common buffer also comprises in above-mentioned collector: controller, UART, two adopt output ports and a sampling pulse input port.Also comprise DC and LDO in above-mentioned collector, above-mentioned DC and LDO can in the situation that do not connect external power source, carry out self power supply to above-mentioned collector.
The utility model embodiment utilizes the high reliability of FPGA, and the electronic units such as above-mentioned diode, integrating circuit, AD circuit, impact damper, controller and UART are realized by FPGA, and above-mentioned electronic unit all is integrated in a FPGA.
The hardware characteristics of above-mentioned ECVT800E4 series collector is as follows:
A. adopt each phase independent digit.
B. without the hardware adjustment element, by USB mouth configuration parameter.
C. collector guarantees self 0.1% class precision, and sensing head amplitude and phase error are compensated by combiner.
D. the good maintainability of electric loop.When changing collector, exempt from Precision adjustment.Without again demarcating.
Above-mentioned ECVT800E4 series collector takes into full account the relatively severe running environment of process layer on design of hardware and software, takes totally-enclosed cabinet, and the anti-vibration ability of device improves greatly, and external electromagnetic radiation also meets relevant criterion.Each analog channel is taked quarantine measures, eliminates passage and harasses; Optical fiber and digital output antijamming capability is strong, but long-distance transmissions.
The suitable environment temperature range of above-mentioned ECVT800E4 series collector is wide, and temperature all can work at-40 ℃～+ 80 ℃ environment, can install on the spot.
The insulating property of above-mentioned ECVT800E4 series collector are as follows:
(1) insulation resistance
Install insulation resistance between all circuit and shell under standard test conditions, be not less than 100M Ω.
(2) dielectric strength
The current-carrying part of device is between shell or the non-conductive metal that exposes, and, between electric unrelated each charged conducting channel, can tolerate interchange 50Hz, voltage 2kV(effective value), last 1min and test, and naked punctures or the flashover phenomenon.The aviation terminal is exchanged 50Hz to the shell ability, voltage 500V(effective value), last the 1min test, and naked punctures or the flashover phenomenon.
(3) surge voltage
The current-carrying part of device is between shell or the non-conductive metal that exposes, and between electric unrelated each charged conducting channel, under the test condition of regulation, and the check of impact in short-term that the High Voltage Impulse Waveform that to tolerate amplitude be 5kV is the standard lightning wave.The aviation terminal is checked by the impact in short-term that High Voltage Impulse Waveform that amplitude is 1kV is the standard lightning wave to the shell ability.In process of the test, allow to occur not causing the flashover of insulation damages, if there is flashover, the setting check dielectric strength with 75% should meet the demands.
(4) wet-hot aging performance
Can bear the damp heat test of GB/T7261-2008 regulation.Test temperature is+40 ℃ ± 2 ℃, and relative humidity is (93 ± 3) %, and duration of test runs is that each cycle of 48h(is 24h).In 2h, measure each galvanic circle to exposing between non-charged conducting position and shell before off-test, the insulation resistance between electric unrelated each loop, its insulation resistance should not be less than 1.5M Ω; Dielectric strength be not less than 2.3.2. regulation dielectric strength trial voltage value 75%.
As shown in Figure 8, the corresponding situation of each port is as follows for the port organization schematic diagram of a kind of above-mentioned ECVT800E4 series collector that this embodiment provides:
VIN+: positive supply input
VIN-: negative supply input
EARTH: the earth
IN+: positive signal input
IN-: negative signal input
U11: light digital signal output 1 connects combiner
U12: light digital signal output 2 connects combiner
U14: external sync pulse input, UART debug port input (under debugging mode).
The ECT800-110/SG electronic current mutual inductor that the utility model embodiment provides is individual struts type electronic current mutual inductor, and this ECVT800E4 series electronic formula current transformer outline overall and installing dimensions figure as shown in Figure 9.Adopt Rogowski coil sensing, the current measurement accuracy is better than the 0.2S/5TPE level, this product range of dynamic measurement is wide, transient characterisitics and measure linear degree are good, insulation technology and manufacturing process maturation, characteristics such as lightweight (are equivalent to same electric pressure conventional weight 1/3), the Collect conversion partial design is the earth potential side below base of mutual inductor, possesses the double A/D system, be two-way independently sampling system input quantity is gathered, antijamming capability is strong, reliability is high, be applicable to 50Hz, the analog acquisition conversion of the large electric current (100A～3000A) of 110kV electric pressure, its output data layout is standard UART, access merge cells by optical fiber, and then reach protective device and process-level network, meet the intelligent substation protection, observing and controlling, the requirement of metering.
The insulation resistance test of ECT800-110/SG electronic current mutual inductor is as follows:
Once end applies the 2500V power-frequency voltage over the ground, records answer>1000M Ω of insulation resistance: qualified.
Secondary converter power, alarm contact apply the 500V power-frequency voltage over the ground, record insulation resistance>100M Ω: qualified.
Secondary converter and cable signal end apply the 500V power-frequency voltage over the ground, record insulation resistance>100M Ω: qualified.
The power-frequency withstand voltage test is as follows:
Once end applies power-frequency withstand voltage 230kV over the ground, lasts 1min: qualified.
The secondary converter power applies power-frequency withstand voltage 2kV over the ground, lasts 1min: qualified.
Secondary converter and cable signal end apply power-frequency withstand voltage 1.5kV over the ground, last 1min: qualified.
The measurement of partial discharge test is as follows:
Once end applies power-frequency withstand voltage 126kV over the ground, and discharge capacity is 3pC, then is down to 87kV, and discharge capacity is 2pC.
Micro-water test: answer≤150uL/L of hydrone content: qualified.
The leak detection test: SF6 gas year slip answers≤0.5%: qualified.
EMC test is as follows
The dielectric test test is as follows
Test voltage/time 230kV/1min, test result is without puncturing, without flashover
Accuracy test
The Verification of Measuring Current Transformer class of accuracy is 0.2S.As follows with reference to " GB/T20840.8-2007 mutual inductor the 8th part: electronic current mutual inductor " relevant regulations:
The measurement accuracy requirement
Measure and use the accuracy test data:
The protective current transformer, class of accuracy is 5P.As follows with reference to " GB/T20840.8-2007 mutual inductor the 8th part: electronic current mutual inductor " relevant regulations:
Protection requires with class of accuracy:
Protection accuracy test data:
By the type approval test of China Power industrial electrical installation quality inspection test center, the situation of specifically testing is with reference to type-test report.This product becomes and puts into operation in Anyang Power Supply Company of Henan Electric Power Company Anyang north suburb 110kV intelligence in April, 2011, and the operation proof is as follows.
The product of the 4.2EVT800-110/SG electronic type voltage transformer of the utility model embodiment is individual struts type electronic type voltage transformer, and this ECVT800E4 series electronic formula voltage transformer (VT) outline overall and installing dimensions figure as shown in figure 10.Adopt coaxial capacitance dividing potential drop sensing, the voltage measurement accuracy is better than 0.2 grade, this product range of dynamic measurement is wide, and transient characterisitics and measure linear degree are good, insulation technology and manufacturing process maturation, characteristics such as lightweight (are equivalent to same electric pressure conventional weight 1/3), the Collect conversion partial design is the earth potential side below base of mutual inductor, possesses the double A/D system, two-way independently sampling system input quantity is gathered, antijamming capability is strong, and reliability is high.Be applicable to the analog acquisition conversion of 50Hz, 110kV electric pressure, its output data layout is standard UART, accesses merge cells by optical fiber, and then reaches protective device and process-level network, meets the requirement of intelligent substation protection, observing and controlling, metering.
The insulation resistance test of above-mentioned 4.2EVT800-110/SG electronic type voltage transformer is as follows:
Once end applies the 2500V power-frequency voltage over the ground, records answer>1000M Ω of insulation resistance: qualified.
Secondary converter power, alarm contact apply the 500V power-frequency voltage over the ground, record insulation resistance>100M Ω: qualified.
Secondary converter and cable signal end apply the 500V power-frequency voltage over the ground, record insulation resistance>100M Ω: qualified.
The power-frequency withstand voltage test is as follows::
Once end applies power-frequency withstand voltage 230kV over the ground, lasts 1min: qualified.
The secondary converter power applies power-frequency withstand voltage 2kV over the ground, lasts 1min: qualified.
Secondary converter and cable signal end apply power-frequency withstand voltage 1.5kV over the ground, last 1min: qualified.
The measurement of partial discharge test is as follows::
Once end applies power-frequency withstand voltage 126kV over the ground, and discharge capacity is 3pC, then is down to 87kV, and discharge capacity is 2pC.
Micro-water test: answer≤150uL/L of hydrone content: qualified.
The leak detection test: SF6 gas year slip answers≤0.5%: qualified.
EMC test is as follows:
Dielectric test is as follows:
| Tested circuit | Trial voltage (effective value) | |
| 1 pair, loop shell | AC2000V | Without abnormal |
| 2 pairs, loop shell | AC1500V | Without abnormal |
| Between 1～loop, |
AC2000V | Without abnormal |
Test voltage/time 230kV/1min, test result is without puncturing, without flashover
Accuracy test is as follows:
Measuring is 0.2 with the voltage transformer (VT) class of accuracy.As follows with reference to " GB/T20840.7-2007 mutual inductor the 7th part: electronic type voltage transformer " relevant regulations:
Metering requires with the electronic type voltage transformer standard of accruacy:
Electronic type voltage transformer accuracy measurement data for metering:
| Magnitude of voltage (percentage of rated voltage) | 80% | 100% | 120% |
| Error (%) | +0.02 | +0.01 | +0.02 |
| Differ (') | +4 | +4 | +3 |
The Verification of Measuring Current Transformer class of accuracy is 3P.As follows with reference to " GB/T20840.7-2007 mutual inductor the 7th part: electronic type voltage transformer " relevant regulations:
Protection requires with the electronic type voltage transformer standard of accruacy:
Electronic type voltage transformer accuracy measurement data for protection:
| Magnitude of voltage (percentage of rated voltage) | 2% | 5% | 120% |
| Error (%) | +0.25 | +0.08 | +0.03 |
| Differ (') | +13 | +8 | +3 |
This product, by the type approval test of China Power industrial electrical installation quality inspection test center, becomes and puts into operation in Anyang Power Supply Company of Henan Electric Power Company Anyang north suburb 110kV intelligence in April, 2011.
The product of the utility model embodiment is at the north suburb, Anyang 110kV intelligent substation, Jiaozhuo Jiao Nan 110kV intelligent substation is applied, sensor and electronic unit seamless link technology in the electronic mutual inductor of the utility model embodiment, technology is exchanged in the accuracy free of losses, the application of having succeeded of the correlation techniques such as electronics collecting unit place point position side installation, and be about to large-tonnage product and introduced to the market, enter the intelligence engineering application stage, for the Operation of Electric Systems maintainer simplifies the electronic mutual inductor maintenance procedures, save maintenance time and maintenance cost and bring great economic benefit.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, and the module in accompanying drawing or flow process might not be that enforcement the utility model is necessary.
One of ordinary skill in the art will appreciate that: the module in the equipment in embodiment can be described and be distributed in the equipment of embodiment according to embodiment, also can carry out respective change and be arranged in the one or more equipment that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
In sum, the utility model embodiment is by being installed on collector the earth potential side of electronic mutual inductor, dynamically adjust the correction factor of collector according to the performance of sensor, collector and sensing head are complementary, electronics collecting unit and sensing unit seamless link and accuracy free of losses exchange have been realized, when simplifying maintenance procedures, improve the convenience that the electronics collecting unit is safeguarded, reduced maintenance and operating cost.Avoided the severe electromagnetic environment of high-pressure side, extended the life-span in electronic type loop, reduced frequency of maintenance, to intelligent grid, safe and reliable, long-life is provided, is easy to the electronic mutual inductor of safeguarding, for the safe operation of national intelligent grid provides powerful guarantee.
The utility model embodiment solved the electronics collecting unit operation that current electronic mutual inductor exists unreliable, safeguard numerous and diverse and high in cost of production problem, break the bottleneck of electronic mutual inductor secondary circuit, improved the universality of electronic mutual inductor, shorten maintenance period, simplify maintenance process, make the rapid wear electronic unit of electronic mutual inductor safeguard summary, cancel the process of changing when electronic unit need to be grown the field adjustable that cuts off the power supply, during on-the-spot the replacing, compole is short, almost nil, shorten maintenance time, saved maintenance funds.
The utility model embodiment has improved the universality of electronic mutual inductor, and the popularization of electronic mutual inductor is had to impetus, has accelerated the commercialization of electronic mutual inductor, for implementing in full, builds intelligent grid powerful guarantee is provided.Follow the development of electronic mutual inductor, can be applied to, in the secondary electron loop of any electronic mutual inductor, to there is wide application space and market efficiency.
The above; it is only preferably embodiment of the utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.
Claims (8)
1. an electronic mutual inductor, is characterized in that, comprising: sensing head, collector and merge cells,
Described sensing head, be connected with described collector by shielded cable, to described collector, sends input signal;
Described collector, be connected with described merge cells by optical fiber, is installed on the earth potential side of described electronic mutual inductor, and the correction factor of described collector is dynamically adjusted according to the performance of described sensor; By sampling system, described input signal is collected to digital signal, described digital signal is exported to merge cells by optical fiber;
Described merge cells, be connected with described collector by optical fiber, and the digital signal that described collector output is come merges processing, converts Ethernet data to, and described Ethernet data is exported by optical fiber.
2. electronic mutual inductor according to claim 1 is characterized in that:
Described collector, comprise impact damper, controller, Universal Asynchronous Receiver & dispensing device UART and two-way independently sampling system ，Mei road sampling system comprise diode, integrating circuit and analog to digital conversion AD circuit, two-way sampling system common buffer.
3. electronic mutual inductor according to claim 2, is characterized in that, the described diode in described collector, integrating circuit, AD circuit, impact damper, controller and UART realize by on-site programmable gate array FPGA.
4. electronic mutual inductor according to claim 3 is characterized in that:
Described collector, also comprise direct current DC and low pressure difference linear voltage regulator LDO, and described DC and LDO, in the situation that described collector does not connect external power source, are powered to described collector.
5. electronic mutual inductor according to claim 1, is characterized in that, described collector is taked totally-enclosed cabinet, and each inner analog channel is taked quarantine measures.
6. electronic mutual inductor according to claim 1, is characterized in that, described optical fiber is multimode optical fiber.
7. electronic mutual inductor according to claim 1, described collector comprises positive supply input port VIN+, negative supply input port VIN-, the earth port EARTH, positive signal input port IN+, negative signal input port IN-, light digital signal output end mouth 1U11, light digital signal output end mouth 2U12, external sync pulse input end mouth U14.
8. according to the described electronic mutual inductor of claim 1 to 7 any one, described electronic mutual inductor comprises that electronic current mutual inductor and the capacitance-resistance based on Luo-coil divide the die mould electronic type voltage transformer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202948419U CN203324347U (en) | 2013-05-27 | 2013-05-27 | Electronic transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202948419U CN203324347U (en) | 2013-05-27 | 2013-05-27 | Electronic transformer |
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| CN203324347U true CN203324347U (en) | 2013-12-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323641A (en) * | 2013-05-27 | 2013-09-25 | 河南省电力公司鹤壁供电公司 | Electronic transformer and implementation method thereof |
| CN105758519A (en) * | 2016-02-19 | 2016-07-13 | 广州市诚臻电子科技有限公司 | Light intensity test device and light intensity test system capable of bearing high electromagnetic radiation field and applications thereof |
| CN107727910A (en) * | 2017-09-29 | 2018-02-23 | 国网吉林省电力有限公司电力科学研究院 | A kind of transformer station's current synchronization harvester based on active electronic type instrument transformer |
-
2013
- 2013-05-27 CN CN2013202948419U patent/CN203324347U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323641A (en) * | 2013-05-27 | 2013-09-25 | 河南省电力公司鹤壁供电公司 | Electronic transformer and implementation method thereof |
| CN103323641B (en) * | 2013-05-27 | 2015-12-02 | 国家电网公司 | The implementation method of electronic mutual inductor and electronic mutual inductor |
| CN105758519A (en) * | 2016-02-19 | 2016-07-13 | 广州市诚臻电子科技有限公司 | Light intensity test device and light intensity test system capable of bearing high electromagnetic radiation field and applications thereof |
| CN105758519B (en) * | 2016-02-19 | 2019-03-08 | 广州市诚臻电子科技有限公司 | A kind of light intensity test device, system and its application for bearing high electromagnetic radiation field |
| CN107727910A (en) * | 2017-09-29 | 2018-02-23 | 国网吉林省电力有限公司电力科学研究院 | A kind of transformer station's current synchronization harvester based on active electronic type instrument transformer |
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| GR01 | Patent grant | ||
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Owner name: HEBI POWER SUPPLY COMPANY, STATE GRID HENAN ELECTR Free format text: FORMER NAME: HUNAN ELECTRIC POWER COMPANY, HEBI POWER SUPPLY COMPANY |
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| CP03 | Change of name, title or address |
Address after: No. 164 Hebi City, Henan province 458030 Qibin District Qibin Avenue Patentee after: HEBI POWER SUPPLY COMPANY OF STATE GRID HENAN ELECTRIC POWER COMPANY Address before: No. 164 Hebi City, Henan province 458030 Qibin Avenue Patentee before: Hunan Electric Power Company, Hebi Power Supply Company |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20210527 |
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| CF01 | Termination of patent right due to non-payment of annual fee |