CN106526258B - Light three-phase voltage generator - Google Patents
Light three-phase voltage generator Download PDFInfo
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- CN106526258B CN106526258B CN201510583024.9A CN201510583024A CN106526258B CN 106526258 B CN106526258 B CN 106526258B CN 201510583024 A CN201510583024 A CN 201510583024A CN 106526258 B CN106526258 B CN 106526258B
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Abstract
Light-duty three-phase voltage generator belongs to electric power system relay protection technical field, especially relates to a light-duty three-phase voltage generator. The invention provides a light three-phase voltage generator which is small in volume and weight and is applied to a relay protection secondary circuit. The invention comprises a switch K3, and is structurally characterized in that one end of the switch K3 is connected with a power input terminal, the other end of the switch K3 is connected with the input end of a self-coupling voltage regulator T2, the output end of the self-coupling voltage regulator T2 is connected with the input end of an isolation transformer T3, one end of the output end of the isolation transformer T3 is connected with one end of an adjustable resistor R14, the other end of the adjustable resistor R14 is connected with one end of a resistor R5, and the other end of the resistor R5 is respectively connected with one end of a resistor R6, one end of an adjustable resistor R10 and a voltage output terminal UA.
Description
Technical Field
The invention belongs to the technical field of relay protection of power systems, and particularly relates to a light three-phase voltage generator.
Background
At present, along with the construction of a large number of intelligent substations, protection sampling is carried out in a merging unit, places when fault quantity is added to a protection device by using a relay protection microcomputer tester are dispersed, and sometimes the microcomputer tester with weight of four fifty jin needs to be moved to a working place upstairs and downstairs, so that labor and time are wasted, and the working efficiency is seriously affected.
In some occasions, especially when a 66KV intelligent substation is protected and debugged, only a group of three-phase power frequency test currents are needed to carry out a test of protecting fixed values or measured values, a power-on place at the 66KV side is located at a terminal block of a 66KV switch cabinet, a 10KV side is located at a 10KV bus where a main transformer secondary switch is located, working places are discrete, microcomputer protection testers weighing tens of kilograms are needed to be moved at different places, and labor and time are wasted, and working efficiency is low.
Disclosure of Invention
The invention aims at the problems and provides a light three-phase voltage generator which is small in size and weight and is applied to a relay protection secondary circuit.
In order to achieve the above purpose, the invention adopts the following technical scheme that the invention comprises a switch K3, and is structurally characterized in that one end of the switch K3 is connected with a power input terminal, the other end of the switch K3 is connected with the input end of a self-coupling voltage regulator T2, the output end of the self-coupling voltage regulator T2 is connected with the input end of an isolation transformer T3, one end of the output end of the isolation transformer T3 is connected with one end of an adjustable resistor R14, the other end of the adjustable resistor R14 is connected with one end of a resistor R5, and the other end of the resistor R5 is respectively connected with one end of a resistor R6, one end of an adjustable resistor R10 and a voltage output terminal UA; the other end of the resistor R6 is respectively connected with the center tap of the output end of the isolation transformer T3, one end of the capacitor C7, one end of the adjustable resistor R12, the ground wire, one end of the capacitor C11 and the terminal UN, the other end of the capacitor C11 is connected with the other end of the adjustable resistor R10, the other end of the capacitor C7 is respectively connected with one end of the adjustable resistor R8 and the voltage output terminal UC, the other end of the adjustable resistor R8 is connected with one end of the resistor R9, the other end of the resistor R9 is respectively connected with the other end of the output end of the isolation transformer T3 and one end of the capacitor C14, the other end of the capacitor C14 is respectively connected with one end of the resistor R13 and the voltage output terminal UB, and the other end of the resistor R13 is connected with the other end of the adjustable resistor R12.
As a preferred solution, the switch K3 of the present invention is opened by 2A.
As another preferable scheme, the self-coupling voltage regulator T2 of the present invention adopts a 50W self-coupling voltage regulator.
As another preferable scheme, the isolation transformer T3 adopts an isolation transformer with 50W and a transformation ratio of 220/120/120.
In addition, the adjustable resistor R14 adopts 200 ohm and 5W adjustable resistor, the resistor R5 adopts 0.5 Kohm and 50W fixed resistor, the resistor R6 adopts 0.6 Kohm and 50W fixed resistor, the resistor C7 adopts 5 mu F and 400VAC capacitor, the resistor R8 adopts 200 ohm and 5W adjustable resistor, the resistor R9 adopts 1 Kohm and 50W fixed resistor, the resistor R10 adopts 200 ohm and 5W adjustable resistor, the capacitor C11 adopts 1 mu F and 400VAC capacitor, the resistor R12 adopts 200 ohm and 5W adjustable resistor, the resistor R13 adopts 0.5 Kohm and 50W fixed resistor, and the capacitor C14 adopts 1 mu F and 400VAC capacitor.
In addition, the voltage output terminal UA of the present invention is connected to the UA terminal of the protection terminal block, the voltage output terminal UB is connected to the UB terminal of the protection terminal block, and the voltage output terminal UC is connected to the UC terminal of the protection terminal block.
The invention has the beneficial effects that.
The invention can play a role in half-effort for debugging the spare power automatic switching device, checking the fixed value of line protection, remote measurement, trial and the like in engineering debugging of digital substations and common substations. Through a large number of experiments, the parameter index of the invention meets the requirement of protection and debugging, the output power of the invention meets the requirement of carried load, and the output voltage waveform of the invention is a standard sine wave. The invention can meet the load capacity under the condition of all relay protection alternating voltage secondary loop loads and meet the error requirement. The invention can be applied to relay protection secondary circuits and is connected to the protection terminal strip.
According to the invention, the three resistors R14, R5 and R6 can generate UA phase voltage through a voltage division principle; c7, R8 and R9 can generate UB phase voltages with equal amplitude and phase advance of 240 degrees for UA through resistance-capacitance parameter adjustment; r12, R13 and C14 can generate UC phase voltages with equal amplitude and 120 degrees of phase advance from UA through resistance-capacitance parameter adjustment. The R10 and C11 loops can finely adjust the UA phase so as to meet the requirement of the UA, UB and UC on the symmetrical accuracy of the phase determination.
The invention combines a small-sized and light low-power transformer with a resistance-capacitance voltage dividing circuit to generate three-phase voltage, and provides needed three-phase alternating-current symmetrical voltage for a relay protection secondary circuit test of an electric power system; the volume and weight of the test instrument are greatly reduced.
The invention does not need to adopt the traditional links of inversion, rectification, power amplification and the like, but only adopts the links of voltage reduction, resistance-capacitance voltage division and the like, and has simple loop construction.
When the three-phase voltage output loop is short-circuited, the whole voltage generation loop is not damaged at all, and the generator can immediately recover to be normal after the short-circuit is eliminated.
The invention can be applied to high-impedance components and loops.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a diagram of the application connection of the present invention in relay protection operation.
Fig. 3 is a schematic circuit diagram of a lightweight three-phase current generator according to the present invention.
Fig. 4 is a voltage vector diagram of the three-phase voltage generation circuit of the present invention after being connected to the protection voltage circuit.
Detailed Description
As shown in the figure, the invention comprises a switch K3, wherein one end of the switch K3 is connected with a power input terminal, the other end of the switch K3 is connected with the input end of a self-coupling voltage regulator T2, the output end of the self-coupling voltage regulator T2 is connected with the input end of an isolation transformer T3, one end of the output end of the isolation transformer T3 is connected with one end of an adjustable resistor R14, the other end of the adjustable resistor R14 is connected with one end of a resistor R5, and the other end of the resistor R5 is respectively connected with one end of a resistor R6, one end of an adjustable resistor R10 and a voltage output terminal UA; the other end of the resistor R6 is respectively connected with the center tap of the output end of the isolation transformer T3, one end of the capacitor C7, one end of the adjustable resistor R12, the ground wire, one end of the capacitor C11 and the terminal UN, the other end of the capacitor C11 is connected with the other end of the adjustable resistor R10, the other end of the capacitor C7 is respectively connected with one end of the adjustable resistor R8 and the voltage output terminal UC, the other end of the adjustable resistor R8 is connected with one end of the resistor R9, the other end of the resistor R9 is respectively connected with the other end of the output end of the isolation transformer T3 and one end of the capacitor C14, the other end of the capacitor C14 is respectively connected with one end of the resistor R13 and the voltage output terminal UB, and the other end of the resistor R13 is connected with the other end of the adjustable resistor R12.
The switch K3 is opened by adopting 2A.
The self-coupling voltage regulator T2 adopts a 50W self-coupling voltage regulator.
The isolation transformer T3 adopts an isolation transformer with 50W and a transformation ratio of 220/120/120. The invention converts a single-phase 220V alternating voltage into a three-phase alternating current symmetrical test voltage which can meet the requirements of the relay protection profession of the power system instead of the single-phase alternating voltage.
The adjustable resistor R14 adopts 200 ohms and 5W adjustable resistor, the resistor R5 adopts 0.5 Kohms and 50W fixed resistor, the resistor R6 adopts 0.6 Kohms and 50W fixed resistor, the resistor C7 adopts 5 muF and 400VAC capacitor, the resistor R8 adopts 200 ohms and 5W adjustable resistor, the resistor R9 adopts 1 Kohms and 50W fixed resistor, the resistor R10 adopts 200 ohms and 5W adjustable resistor, the capacitor C11 adopts 1 muF and 400VAC capacitor, the resistor R12 adopts 200 ohms and 5W adjustable resistor, the resistor R13 adopts 0.5 Kohms and 50W fixed resistor, and the capacitor C14 adopts 1 muF and 400VAC capacitor. The parameter configuration is determined through a large number of experiments, when the load impedance is 20K ohms, the loop configured according to the parameter can generate an error of not more than 3% after being loaded, the loading capacity is strong, and the long-term operation thermal stability requirement is met.
The voltage output terminal UA is connected with the UA terminal of the protection terminal row, the voltage output terminal UB is connected with the UB terminal of the protection terminal row, and the voltage output terminal UC is connected with the UC terminal of the protection terminal row.
The invention can be matched with a light three-phase current generator.
The light three-phase current generator comprises a switch K1, wherein the input end of the switch K1 is connected with an alternating current input terminal, the output end of the switch K1 is connected with the input end of a self-coupling voltage regulator T1, the output end of the self-coupling voltage regulator T1 is connected with the input end of an isolation transformer T4, one end of the output end of the isolation transformer T4 is an A-phase output end, and the A-phase output end is connected with the A-phase current output terminal through a capacitor C1, an adjustable resistor R1 and a resistor R2 in sequence; the first tap of the isolation transformer T4 is a B-phase output end, and the B-phase output end is connected with a B-phase current output terminal through a switch K2; the second tap of the isolation transformer T4 is a C-phase output end, and the C-phase output of the isolation transformer T4 is connected with a C-phase current output terminal through a resistor R3 and an adjustable resistor R4. The light three-phase current generator can play a role in testing and the like by remote measurement with half effort in debugging of a spare power automatic switching device, fixed value verification of line protection and the like in engineering debugging of a digital transformer substation and a common transformer substation. Through a large number of experiments, the parameter index of the light three-phase current generator meets the requirement of protection and debugging, the output power of the light three-phase current generator meets the requirement of carried load, and the current waveform output by the light three-phase current generator is a standard sine wave. The light three-phase current generator can meet the load capacity under the condition of all relay protection alternating current secondary loop loads, and meets the error requirement. The light three-phase current generator can be applied to a relay protection secondary circuit and is connected to a protection terminal row.
The light three-phase current generator of the invention enables the sum of the resistance of the adjustable resistor R1 and the resistance of the resistor R2 to be equal to 1 +.10 of the capacitive reactance of the capacitor C1 by adjusting the size of the adjustable resistor R1
The combination of the capacitor C1, the adjustable resistor R1 and the resistor R2 adjusts the current magnitude and the phase of the IA phase to lead the IA to the IC by 240 degrees. Resistor R3 and adjustable resistor R4 combine to adjust the IC phase current.
The light three-phase current generator combines a small-sized and light low-power transformer, a converter and a phase adjustment loop to generate three-phase alternating current, and provides needed three-phase alternating current symmetrical current for a relay protection secondary loop test of a power system. Thus, the volume and weight of the test instrument can be reduced by more than ten times. The size of the light three-phase current generator is equal to that of a common universal meter.
The three-phase alternating current test current generated by the light three-phase current generator does not need to adopt the traditional links of inversion, rectification, power amplification and the like, but only adopts the links of voltage regulation, phase adjustment, current transformation and the like, and the circuit is simple in structure.
The switch K2 adopts a three-position switch, the toggle end A of the three-position switch is connected with the B-phase output end, the fixed end B of the three-position switch is connected with the B-phase current output terminal, the fixed end C of the three-position switch is connected with the standby terminal, and the three-position switchThe fixed end D of the isolation transformer T4 is connected with one end of the input end of the current transformer T5, the other end of the input end of the current transformer T5 is connected with the other end of the output end of the isolation transformer T4, and the output end of the current transformer T5 is connected with a fixed value checking terminal. The three-position switch has
、/>
Three positions 0, when beating +.>
When the bit is in the bit state, the terminal AB is connected, and an IB phase current output loop is connected; when beating +.>
When the bit is in the bit, the AD is conducted, and the output loop of the large current is connected; when the switch is in the 0 position, the AC is on, no current is output at the moment, and C is a standby terminal. The current converter T5 is partially a single-phase high-current output loop which can be used as an auxiliary loop to provide a constant value checking function of overcurrent and quick-break protection.
The isolation transformer T4 adopts a 200W isolation transformer; the transformation ratio of the isolation transformer T4 is 220V/60V/60V/90V, when the voltage of the input end of the isolation transformer T4 is 220V, the voltage between the B phase output end and the A phase output end is 60V, the voltage between the C phase output end and the B phase output end is 60V, and the voltage between the other end of the output end of the isolation transformer T4 and the C phase output end is 90V. The innovation points of the light three-phase current generator are shown in the following steps: a single-phase 220V alternating current is converted into a three-phase alternating current symmetrical test current which can meet the requirements of relay protection profession of a power system by using the simplest means.
The current converter T5 adopts a primary winding 25, a secondary winding 5 and a 50-watt power current converter. The light three-phase current generator can further reduce the volume and weight of the light three-phase current generator by adopting the 50W low-power light current converter.
The switch K1 is opened by 2A alternating current.
The A-phase current output terminal is connected with the IA terminal of the protection terminal row, the B-phase current output terminal is connected with the IB terminal of the protection terminal row, and the C-phase current output terminal is connected with the IC terminal of the protection terminal row.
The self-coupling voltage regulator T1 adopts 200W, 220V/250V self-coupling voltage regulators. The 200W self-coupling voltage regulator is matched with the 200W isolation transformer T4, so that the waveform of the output current is conveniently limited; the output current waveform is made to be an unsaturated, undistorted sine wave.
The capacitor C1 adopts 122 microfarads and 400VAC, the adjustable resistor R1 adopts a 10 ohm 50W adjustable resistor, the resistor R3 adopts a 20 ohm 50W fixed resistor, and the adjustable resistor R4 adopts a 15 ohm 50W adjustable resistor. Through the parameter matching, a group of three-phase symmetrical IA, IB and IC output currents with 1A output and one-phase current with 20A can be regulated.
It should be understood that the foregoing detailed description of the present invention is provided merely to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that modifications and equivalent substitutions can be made to the present invention to achieve the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (1)
1. The light three-phase voltage generator comprises a switch K3, and is characterized in that one end of the switch K3 is connected with a power input terminal, the other end of the switch K3 is connected with the input end of an autotransformer T2, the output end of the autotransformer T2 is connected with the input end of an isolation transformer T3, one end of the output end of the isolation transformer T3 is connected with one end of an adjustable resistor R14, the other end of the adjustable resistor R14 is connected with one end of a resistor R5, and the other end of the resistor R5 is respectively connected with one end of a resistor R6, one end of an adjustable resistor R10 and a voltage output terminal UA; the other end of the resistor R6 is respectively connected with a center tap of an output end of the isolation transformer T3, one end of a capacitor C7, one end of an adjustable resistor R12, a ground wire, one end of a capacitor C11 and a terminal UN, the other end of the capacitor C11 is connected with the other end of the adjustable resistor R10, the other end of the capacitor C7 is respectively connected with one end of an adjustable resistor R8 and a voltage output terminal UC, the other end of the adjustable resistor R8 is connected with one end of a resistor R9, the other end of the resistor R9 is respectively connected with the other end of the output end of the isolation transformer T3 and one end of a capacitor C14, the other end of the capacitor C14 is respectively connected with one end of a resistor R13 and the other end of the voltage output terminal UB, and the other end of the resistor R13 is connected with the other end of the adjustable resistor R12;
the switch K3 is opened by adopting 2A;
the self-coupling voltage regulator T2 adopts a 50W self-coupling voltage regulator;
the isolation transformer T3 is a 50W isolation transformer with a transformation ratio of 220/120/120;
the adjustable resistor R14 adopts 200 ohms and 5W adjustable resistors, the resistor R5 adopts 0.5 Kohms and 50W fixed resistors, the resistor R6 adopts 0.6 Kohms and 50W fixed resistors, the capacitor C7 adopts 5 muF and 400VAC capacitors, the resistor R8 adopts 200 ohms and 5W adjustable resistors, the resistor R9 adopts 1 Kohms and 50W fixed resistors, the resistor R10 adopts 200 ohms and 5W adjustable resistors, the capacitor C11 adopts 1 muF and 400VAC capacitors, the resistor R12 adopts 200 ohms and 5W adjustable resistors, the resistor R13 adopts 0.5 Kohms and 50W fixed resistors, and the capacitor C14 adopts 1 muF and 400VAC capacitors;
the voltage output terminal UA is connected with the UA terminal of the protection terminal row, the voltage output terminal UB is connected with the UB terminal of the protection terminal row, and the voltage output terminal UC is connected with the UC terminal of the protection terminal row.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510583024.9A CN106526258B (en) | 2015-09-15 | 2015-09-15 | Light three-phase voltage generator |
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| CN201510583024.9A CN106526258B (en) | 2015-09-15 | 2015-09-15 | Light three-phase voltage generator |
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| CN106526258A CN106526258A (en) | 2017-03-22 |
| CN106526258B true CN106526258B (en) | 2023-06-09 |
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| US6087738A (en) * | 1998-08-20 | 2000-07-11 | Robicon Corporation | Variable output three-phase transformer |
| CN2678083Y (en) * | 2004-01-16 | 2005-02-09 | 谷正国 | Small current switchover autoconnected streetlight transformer |
| CN201821315U (en) * | 2009-12-09 | 2011-05-04 | 北京水木源华电气有限公司 | Loaded voltage-adjusting control system of transformer |
| CN203164365U (en) * | 2013-01-28 | 2013-08-28 | 南京民盛电子仪器有限公司 | Voltage sampling circuit of voltage-withstand tester |
| CN103579985A (en) * | 2013-07-24 | 2014-02-12 | 都匀供电局 | Method and device for adjusting ice melting output voltage |
| CN104426383A (en) * | 2013-08-29 | 2015-03-18 | 大禹电气科技股份有限公司 | Autotransformer voltage regulator circuit |
| CN204945196U (en) * | 2015-09-15 | 2016-01-06 | 国网辽宁省电力有限公司沈阳供电公司 | Light-duty three-phase voltage generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2327014C (en) * | 2000-01-12 | 2005-04-12 | Donald W. Owen | Method and apparatus for providing selectable output voltages |
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2015
- 2015-09-15 CN CN201510583024.9A patent/CN106526258B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6087738A (en) * | 1998-08-20 | 2000-07-11 | Robicon Corporation | Variable output three-phase transformer |
| CN2678083Y (en) * | 2004-01-16 | 2005-02-09 | 谷正国 | Small current switchover autoconnected streetlight transformer |
| CN201821315U (en) * | 2009-12-09 | 2011-05-04 | 北京水木源华电气有限公司 | Loaded voltage-adjusting control system of transformer |
| CN203164365U (en) * | 2013-01-28 | 2013-08-28 | 南京民盛电子仪器有限公司 | Voltage sampling circuit of voltage-withstand tester |
| CN103579985A (en) * | 2013-07-24 | 2014-02-12 | 都匀供电局 | Method and device for adjusting ice melting output voltage |
| CN104426383A (en) * | 2013-08-29 | 2015-03-18 | 大禹电气科技股份有限公司 | Autotransformer voltage regulator circuit |
| CN204945196U (en) * | 2015-09-15 | 2016-01-06 | 国网辽宁省电力有限公司沈阳供电公司 | Light-duty three-phase voltage generator |
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