CN103558493A - Extra-high voltage zinc oxide arrester leakage current measurement device and method - Google Patents
Extra-high voltage zinc oxide arrester leakage current measurement device and method Download PDFInfo
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- CN103558493A CN103558493A CN201310533314.3A CN201310533314A CN103558493A CN 103558493 A CN103558493 A CN 103558493A CN 201310533314 A CN201310533314 A CN 201310533314A CN 103558493 A CN103558493 A CN 103558493A
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Abstract
The invention discloses an extra-high voltage zinc oxide arrester leakage current measurement device and method to solve the problems that test reading of an extra-high voltage zinc oxide arrester used in an extra-high voltage transformer substation can not be conveniently conducted and the influence of a leakage current is interfered with. The extra-high voltage zinc oxide arrester leakage current measurement device comprises a voltage regulator (1), a high-voltage silicon pile rectifier (10) and the extra-high voltage zinc oxide arrester (8). An alternating current power supply is connected to a primary edge of the voltage regulator, one end of a secondary edge of the voltage regulator is connected with an input end of the high-voltage silicon pile rectifier, an output end of the high-voltage silicon pile rectifier is connected with one end of the extra-high voltage zinc oxide arrester, the other end of the extra-high voltage zinc oxide arrester is connected with the ground, the other end of the secondary edge of the voltage regulator is connected with the ground after being sequentially connected with a milliammeter (2), a microammeter (3) and an inductor (5) in series, and a voltmeter (9) is connected between the output end of the high-voltage silicon pile rectifier and a connecting end of the milliammeter and the microammeter in parallel. According to the extra-high voltage zinc oxide arrester leakage current measurement device and method, reading can be conveniently and easily conducted, and the influences of a high voltage on measurement of the microammeter do not exist.
Description
Technical field
The present invention relates to a kind of ZnO Arrester for UHV Leakage Current metering circuit device and detection method thereof.
Background technology
In AC input transformation engineering, in order to guarantee the safety of converting equipment, avoid external lightning impact failure equipment, Zinc-Oxide Arrester is installed at nearby device place.Zinc-Oxide Arrester is one of essential electronic element of transformer station, for non-linear ZnO resistors, makes, and is used for preventing outside thunderbolt or internal overvoltage impact failure power equipment.In handing-over or diagnostic test, need DC reference voltage under the direct-current reference current (milliampere level) of on-the-spot test Zinc-Oxide Arrester and the leakage current measurement (microampere order) under 0.75 times of DC reference voltage.It is microampere meter to be installed in lightning arrester high-pressure side measure that current existing high voltage direct current generator is measured leakage current, has following problem: for the high ultra-high voltage lightning arrester of electric pressure, microampere meter is arranged on high-pressure side, and test reading is very inconvenient.Microampere meter is serially connected in test loop all the time, requires microampere meter can bear large direct-current reference current, and ultra-high voltage lightning arrester reference current reaches 8mA, and in high-pressure side, very high to the requirement of microampere meter.Microampere meter is connected on lightning arrester high-pressure side, and the leakage current of test can comprise the clutter interference leakage current of lightning arrester to surrounding air or equipment itself, and measuring error is large.
Summary of the invention
The invention provides a kind of ZnO Arrester for UHV leakage current measurement device and measuring method thereof, solved the problem that ZnO Arrester for UHV experimental test reading is inconvenient and interference leakage current affects in ultra-high voltage transformer station application.
The present invention solves above technical matters by the following technical programs:
A kind of ZnO Arrester for UHV leakage current measurement device, comprise pressure regulator, high-voltage silicon rectifier stack and ZnO Arrester for UHV, on the former limit of pressure regulator, be connected with AC power, the one end on the inferior limit of pressure regulator is connected with the input end of high-voltage silicon rectifier stack, the output terminal of high-voltage silicon rectifier stack is connected with one end of ZnO Arrester for UHV, the other end ground connection of ZnO Arrester for UHV, the other end on the inferior limit of the pressure regulator milliammeter of connecting successively, microampere meter with after inductor, be connected with ground, between the link of milliammeter and microampere meter and the output terminal of high-voltage silicon rectifier stack, be parallel with voltage table, at the two ends of microampere meter, be parallel with hand by normally closed switch.
Between the link of milliammeter and microampere meter and ground, be parallel with respectively capacitor and electric discharge fuse.
A leakage current measuring method, comprises the following steps:
The first step, on the former limit of pressure regulator, connect AC power, the one end on the inferior limit of pressure regulator is connected with the input end of high-voltage silicon rectifier stack, the output terminal of high-voltage silicon rectifier stack is connected with one end of ZnO Arrester for UHV, the other end ground connection of ZnO Arrester for UHV, the other end on the inferior limit of pressure regulator is connected successively after milliammeter, microampere meter and inductor and is connected with ground, shunt voltage table between the link of milliammeter and microampere meter and the output terminal of high-voltage silicon rectifier stack, also jointly presses normally closed switch at the two ends of microampere meter;
The stable rising of Voltage-output of second step, control pressure regulator, milliammeter to be measured reaches 8 milliamperes, reads the magnitude of voltage of shunt voltage table between high-voltage silicon rectifier stack output terminal, i.e. DC reference voltage value under the direct-current reference current of lightning arrester;
The voltage of the 3rd step, control pressure regulator, make the magnitude of voltage of shunt voltage table be down to 75% DC reference voltage value, press the hand of microampere meter two ends parallel connection by normally closed switch, microampere meter is accessed to measuring circuit, read the current value of microampere meter, i.e. leakage current values under 0.75 times of DC reference voltage;
The 4th step, hand is resetted by normally closed switch, control the voltage of pressure regulator, make the magnitude of voltage of shunt voltage table slowly be down to zero, deenergization, test finishes.
The present invention's microampere meter in metering circuit is connected to test loop low pressure end, and convenient reading is simple, and the impact that does not exist high voltage to measure microampere meter.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
A kind of ZnO Arrester for UHV leakage current measurement device, comprise pressure regulator 1, high-voltage silicon rectifier stack 10 and ZnO Arrester for UHV 8, on the former limit of pressure regulator 1, be connected with AC power, the one end on the inferior limit of pressure regulator 1 is connected with the input end of high-voltage silicon rectifier stack 10, the output terminal of high-voltage silicon rectifier stack 10 is connected with one end of ZnO Arrester for UHV 8, the other end ground connection of ZnO Arrester for UHV 8, the other end on the inferior limit of pressure regulator 1 milliammeter 2 of connecting successively, microampere meter 3 is connected with ground with inductor 5 is rear, between the link of milliammeter 2 and microampere meter 3 and the output terminal of high-voltage silicon rectifier stack 10, be parallel with voltage table 9, at the two ends of microampere meter 3, be parallel with hand by normally closed switch 4.
Between the link of milliammeter 2 and microampere meter 3 and ground, be parallel with respectively capacitor 7 and electric discharge fuse 6.
In microampere meter protection control loop, electric capacity filters the AC compounent in measuring circuit, stablizes the reading of microampere meter 3, and guarantees the voltage stabilization of electric discharge fuse 6.Electric discharge fuse 6 protection microampere meters 3 when the electric current by outrange by microampere meter 3 short circuits, protection microampere meter 3, inductor 5 while preventing suddenly-applied short circuit, discharge fuse 6 while having little time to move dash current damage microampere meter 3.
A leakage current measuring method, comprises the following steps:
The first step, on the former limit of pressure regulator 1, connect AC power, the one end on the inferior limit of pressure regulator 1 is connected with the input end of high-voltage silicon rectifier stack 10, the output terminal of high-voltage silicon rectifier stack 10 is connected with one end of ZnO Arrester for UHV 8, the other end ground connection of ZnO Arrester for UHV 8, the other end on the inferior limit of pressure regulator 1 is connected successively, and milliammeter 2, microampere meter 3 and inductor 5 are rear to be connected with ground, shunt voltage table 9 between the link of milliammeter 2 and microampere meter 3 and the output terminal of high-voltage silicon rectifier stack 10, also jointly presses normally closed switch 4 at the two ends of microampere meter 3;
The stable rising of Voltage-output of second step, control pressure regulator 1, milliammeter 2 to be measured reaches 8 milliamperes, reads the magnitude of voltage of shunt voltage table 9 between high-voltage silicon rectifier stack 10 output terminals, i.e. DC reference voltage value under the direct-current reference current of lightning arrester;
The voltage of the 3rd step, control pressure regulator 1, make the magnitude of voltage of shunt voltage table 9 be down to 75% DC reference voltage value, press the hand of microampere meter 3 two ends parallel connections by normally closed switch 4, by microampere meter 3 access measuring circuits, read the current value of microampere meter 3, i.e. leakage current values under 0.75 times of DC reference voltage;
The 4th step, hand is resetted by normally closed switch 4, control the voltage of pressure regulator 1, make the magnitude of voltage of shunt voltage table 9 slowly be down to zero, deenergization, test finishes.
Claims (3)
1. a ZnO Arrester for UHV leakage current measurement device, comprise pressure regulator (1), high-voltage silicon rectifier stack (10) and ZnO Arrester for UHV (8), it is characterized in that, on the former limit of pressure regulator (1), be connected with AC power, the one end on the inferior limit of pressure regulator (1) is connected with the input end of high-voltage silicon rectifier stack (10), the output terminal of high-voltage silicon rectifier stack (10) is connected with one end of ZnO Arrester for UHV (8), the other end ground connection of ZnO Arrester for UHV (8), the other end on the inferior limit of pressure regulator (1) milliammeter (2) of connecting successively, microampere meter (3) is connected with ground with inductor (5) is rear, between the link of milliammeter (2) and microampere meter (3) and the output terminal of high-voltage silicon rectifier stack (10), be parallel with voltage table (9), at the two ends of microampere meter (3), be parallel with hand by normally closed switch (4).
2. a kind of ZnO Arrester for UHV leakage current measurement device according to claim 1, is characterized in that, is parallel with respectively capacitor (7) and electric discharge fuse (6) between the link of milliammeter (2) and microampere meter (3) and ground.
3. a ZnO Arrester for UHV leakage current measuring method, comprises the following steps:
The first step, on the former limit of pressure regulator (1), connect AC power, the one end on the inferior limit of pressure regulator (1) is connected with the input end of high-voltage silicon rectifier stack (10), the output terminal of high-voltage silicon rectifier stack (10) is connected with one end of ZnO Arrester for UHV (8), the other end ground connection of ZnO Arrester for UHV (8), the other end on the inferior limit of pressure regulator (1) milliammeter (2) of connecting successively, microampere meter (3) is connected with ground with inductor (5) is rear, shunt voltage table (9) between the link of milliammeter (2) and microampere meter (3) and the output terminal of high-voltage silicon rectifier stack (10), normally closed switch (4) is also jointly pressed at two ends at microampere meter (3),
The stable rising of Voltage-output of second step, control pressure regulator (1), milliammeter to be measured (2) reaches 8 milliamperes, read the magnitude of voltage of shunt voltage table (9) between high-voltage silicon rectifier stack (10) output terminal, i.e. DC reference voltage value under the direct-current reference current of lightning arrester;
The voltage of the 3rd step, control pressure regulator (1), make the magnitude of voltage of shunt voltage table (9) be down to 75% DC reference voltage value, press the hand of microampere meter (3) two ends parallel connection and press normally closed switch (4), by microampere meter (3) access measuring circuit, read the current value of microampere meter (3), i.e. leakage current values under 0.75 times of DC reference voltage;
The 4th step, hand is resetted by normally closed switch (4), control the voltage of pressure regulator (1), make the magnitude of voltage of shunt voltage table (9) slowly be down to zero, deenergization, test finishes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107037297A (en) * | 2017-06-15 | 2017-08-11 | 国网辽宁省电力有限公司锦州供电公司 | 220kV arresters exempt to tear the intelligent test method of high-voltage connection open |
| CN112068029A (en) * | 2020-09-15 | 2020-12-11 | 国网河南省电力公司平顶山供电公司 | 6-10 kV lightning arrester leakage current measuring method |
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Application publication date: 20140205 |