CN106199164B - A kind of measurement method of transformer iron core grounding current - Google Patents

A kind of measurement method of transformer iron core grounding current Download PDF

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Publication number
CN106199164B
CN106199164B CN201610485031.XA CN201610485031A CN106199164B CN 106199164 B CN106199164 B CN 106199164B CN 201610485031 A CN201610485031 A CN 201610485031A CN 106199164 B CN106199164 B CN 106199164B
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measurement
value
iron core
transformer
current
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CN106199164A (en
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王柏澔
邓桂勇
罗大虎
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State Grid Henan Tongbai Power Supply Co
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State Grid Henan Tongbai Power Supply Co
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

Abstract

The invention proposes a kind of measurement methods of transformer iron core grounding current, are measured using transformer iron core grounding current In-circiut tester, are measured using clamp on amperemeter;Clamp on amperemeter is abutted into iron core grounding pole, measurement obtains the first numerical value;By clamp on amperemeter wound core earthing pole, conducting wire is made to be in the center of jaw, measurement obtains second value;The first numerical value is subtracted with second value and obtains third value, and third value is transformer iron core grounding current;True measurement of a reference value as iron core grounding current is subtracted using measured value when measurement, magnetic flux caused by the electromagnetic induction of transformer itself when having subtracted measurement, the magnetic flux of transformer iron core grounding current generation is accurately measured, the earth current numerical value made is accurate.Iron core grounding current periodically is carried out to running transformer and measures work, convenient for finding the problem in time.

Description

A kind of measurement method of transformer iron core grounding current
Technical field:
The present invention relates to field transformers, and in particular to the measurement of transformer iron core grounding current.
Background technique:
Transformer core and other attachmentes necessarily incude certain voltage in operation, then under the action of applied voltage, work as sense When answering voltage more than discharge voltage over the ground, electric discharge phenomena will be generated.In order to avoid the internal discharge of transformer, so by becoming Depressor iron core grounding.It is not allow multipoint earthing of iron core, because transformer operates normally but when transformer normal operation In, there is the magnetic fields of alternation around winding, due to the effect of electromagnetic induction, between high-voltage winding and low pressure winding, low pressure around Between group and iron core, all there is parasitic capacitance between iron core and shell, winding is charged by by the coupling of parasitic capacitance, Iron core is set to generate floating potential over the ground.Since transformer core and other metal components are unequal at a distance from winding, make each structure There is potential differences between part just generates spark discharge when the potential difference between two o'clock, which reaches, can puncture insulation therebetween. It is this electric discharge be it is interrupted, go down for a long time, have adverse effect to transformer oil and solid insulation.In order to eliminate this phenomenon, Iron core is reliably chained up with shell just, makes iron core and shell equipotential, but when iron core or other metal components have two o'clock Or when multipoint earthing, grounding point just will form closed circuit, cause circulation, cause hot-spot, and transformer is caused to decompose, insulation Performance decline, when serious, can be such that iron core silicon-steel sheet burns out, cause transformer major accident, so transformer core can only be a bit Ground connection.
Currently, whether there is method there are mainly three types of multipoint earthings in detection transformer core, including clamp on amperemeter is determined Phase monitors iron core grounding current Electric Method, measures iron core insulation against ground electric-resistivity method and monitors transformer insulation oil characteristic gas Gas chromatography.
Clamp on amperemeter periodic monitoring iron core grounding current Electric Method, as the term suggests it is exactly to draw ground connection outside transformer core On line, the size of electric current in lead is measured, to determine whether transformer core has multipoint earthing phenomenon.When transformer is normal When operation, because no current circuit is formed in iron core, electric current very little on ground line, mostly milliampere grade, most cases are not More than 0.1A;When there is multipoint earthing phenomenon, ground line, which powers on, to be flowed through greatly, and short-circuit circle has been equivalent to around iron core main flux The case where exist, the circulation flowed through is decided by that point and the relative position of normal ground point occur for failure, i.e., including containing in short-circuit circle Magnetic flux number, it is general up to tens amperes.In this way by the size of current in measurement ground lead, can differentiate very accurately Transformer core is either with or without multipoint earth faults situation out.Most rapid in three kinds of methods, most direct, most sensitive method is measurement The Electric Method of iron core grounding current, Electric Method tradition is to install detection ammeter at iron core grounding end, by determining for operations staff Phase makes an inspection tour to find the problem, and is so not only wasting manpower and material resources' resource, and some unattended operation transformer stations are electrically set Standby operation leaves security risk.Also, this method and step is more, complicated for operation, is unable to on-line analysis, at the scene strong electromagnetic Under environmental disturbances, the precision and timeliness of detection are problematic in that.
Iron core insulation against ground electric-resistivity method is mainly exactly to disconnect iron core normal ground line, selects 2500V megameter (to operation 1000V megameter can be selected in time long transformer) measurement iron core resistance value over the ground, if insulating resistance value is zero or very It is small, then show that there may be multipoint earth faults for transformer core.The method for measuring core insulation resistance obtains in actual field Relatively broad application has been arrived, but due to the limitation of method, can only have been carried out in transformer overhaul, the stable operation to system Many problems are brought in maintenance with detecting, utilization rate of equipment and installations reduces, and operation expense increases.
The gas chromatography of monitoring transformer insulation oil characteristic gas is exactly to carry out gas to transformer gas content of oil Analysis of hplc, this method be detect transformer iron core either with or without there are multipoint earthing phenomenon more timely and effectively method it One.When the iron core of transformer has multipoint earthing phenomenon, oil chromatography usually has following characteristics: total hydrocarbon content, which is higher by, " to be become Depressor dissolved gas analysis and judge directive/guide " specified value (150 μ L/L) of (GB/T 7252-2001), usual methane (CH4) and ethylene (C2H4) accounts for larger specific gravity, and acetylene (C2H2) content is less or even does not occur, i.e., testing result is not up to directive/guide Specified value (5uL/L).When acetylene, which is presented, in chromatography result is higher by directive/guide specified value, then it is believed that the iron core grounding is State ground fault.When chromatography result presentation features described above, and in the case where core insulation resistance value is zero or is very low And when in iron core grounding line having circulation, then can determine the transformer core, there are the failures of multipoint earthing.At this stage, about transformation , technology maturation the most extensive using Oil chromatography analysis in the multipoint earthing of iron core detection of device, but larger, higher cost is invested, Detection only can just be judged when characteristic gas contained in transformer oil reaches specified value, therefore not be very tight in failure It can not find the problem in time in the case where weight, while when the ratio of characteristic gas is not standard value, be difficult accurate judgement failure Type.Therefore this method detection accuracy is not high and there are serious hysteresis qualitys.
A kind of transformer iron core grounding current on-line monitoring system is disclosed in patent document CN 103954829A, is used Current sensor unit, to monitor the iron core grounding current state of transformer, the server storing data with WEB one is for making It is further to call and calculate, analyze and issue data.Plug and play can monitor transformer without software compensation and adjusting Iron core grounding current value, solves the problems, such as monitoring range, the linearity, precision in the prior art, and monitoring range is promoted to peace Grade is trained, the gamut linearity is consistent, and measurement accuracy keeps unified by way of hard ware measure in the range of full scale High-precision.But detected using sensor and server, it is very big to improve cost, and in the high compression ring of transformer work It works in border, the equipment such as electronic sensor are easy failure, and whole system is complex, not very practical.
Patent document CN 103441725A discloses a kind of transformer iron core grounding current monitoring and control system, it is wrapped Transformer, current acquisition unit, single-chip microcontroller, control module are included, transformer is connect with current acquisition unit, and there are two connect single-chip microcontroller Mouth mold block connects with current acquisition unit, control module respectively, and the control module includes motor, rotating device and adjustable resistance, Two current input terminals of the current acquisition unit are connect with two fuse upper ends respectively, and the fuse is arranged in transformation Device iron core grounding line and transformer add part to be grounded, and two output ends of adjustable resistance are connected under two fuses End, when electric current detected is greater than the rated value in deposit single-chip microcontroller, single-chip microcontroller can automatically control control circuit to adjustable resistance It is adjusted, until transformer core current is less than the rated current stored in single-chip microcontroller, alleviates the work of operator Burden, reduce equipment detect twice between because being influenced caused by the excessive electricity consumption electricity consumption user of electric current.It is controlled by single-chip microcontroller Earth current is made and detects, structure is complicated, is not easy to realize, practicability is low.
What application was most at present is clamp on amperemeter periodic monitoring iron core grounding current Electric Method, by measuring ground lead In size of current, can accurately determine transformer core either with or without multipoint earth faults situation, be at present most rapidly, most Directly, most sensitive method, and the strongest method of practicability.Clamp on amperemeter abbreviation pincerlike meter, working portion is mainly by one Active open is made in electromagnetic type ammeter and straight-through current transformer composition, straight-through current transformer iron core, and at pincers Shape, therefore named clamp on amperemeter,.Be it is a kind of be not required to disconnecting circuit can direct slowdown monitoring circuit alternating current portable instrument, in electricity Very easy to use in gas maintenance, application is quite extensive.Pincerlike meter can change different amounts by the fork shift of change-over switch Journey, but do not allow to charge when fork shift and be operated.Pincerlike meter common accurate is not high, and usually 2.5~5 grades.For user Just, there are also the change-over switches of different ranges for surveying different brackets electric current and measuring the function of voltage in table.
Clamp on amperemeter monitors in transformer iron core grounding current measurement work, and being easy to appear causes earth current cannot be just Really, the case where accurately measuring.It is mainly manifested in following several respects:
1) position of iron core grounding point is not known., also there is shell in transformer lower part in operation, existing iron core grounding point Grounding point, and transformer case grounding point more than one, but it is multiple, there have been operation maintenance personnels in measuring transformer iron in this way Before core earth current, it is hard to tell which of Chu the problem of being iron core grounding point.
2) measurement method is inappropriate.Some survey crews directly use after the iron core grounding point for transformer of having distinguished one from the other Clamp on amperemeter is stuck on the band iron of transformer core grounding pole, using the earth current numerical value of reading as the transformer core grounding Current value.
3) measurement numerical value inaccuracy.Measuring transformer iron core grounding current is carried out in the case where transformer belt electricity operation , when measurement, by the magnetic flux of clamp on amperemeter, magnetic flux caused by existing transformer iron core grounding current also has transformer The magnetic flux of magnetic flux caused by the electromagnetic induction of itself, these two aspects is mutually superimposed, acts on clamp on amperemeter, causes pincer The inaccuracy of numerical value measured by ammeter.
Summary of the invention:
The invention proposes a kind of methods of measuring transformer iron core grounding current, comprising: 1) is connect using transformer core Earth-current In-circiut tester measures, and is measured using clamp on amperemeter;2) clamp on amperemeter is abutted into iron core grounding pole, measurement Obtain the first numerical value;3) by clamp on amperemeter wound core earthing pole, conducting wire is made to be in the center of jaw, measurement obtains the Two numerical value;4) the first numerical value being subtracted with second value and obtaining third value, third value is transformer iron core grounding current;5) It when third value is greater than 100mA, is analyzed, checks that measuring instrumentss indicate whether correct or measurement method is appropriate, Whether having the electromagnetic induction of other equipment influences;If confirmation is transformer iron core grounding current greater than electric current as defined in regulation, and When maintenance process;6) when third value is greater than 100mA, resistance is sealed in iron core grounding circuit and carries out current limliting, limits iron core Maximum current is in 300mA or less;By transformer pendant-core examination, increases insulation distance or replace the insulating element of damage to carry out Ground connection defect is eliminated in processing in time.
Further, the clamp on amperemeter is mechanical clamp on amperemeter or digital clamp on amperemeter.
Further, the clamp on amperemeter can store multiple groups measurement data.
Further, there is the clamp on amperemeter historical data to read, save, printing function.
Further, the clamp on amperemeter has RS232 communication interface, with external communication.
Further, it is worth on the basis of first numerical value, second value is the earth current of actual measurement.
Further, the measurement position of transformer is in the extremely upper same position of iron core grounding.
Further, when measuring the first numerical value, repeatedly measurement obtains multiple numerical value, takes the average value of the multiple numerical value to be First numerical value.
Further, when measuring second value, repeatedly measurement obtains multiple numerical value, takes the average value of the multiple numerical value to be Second value.
Further, it when measuring the first numerical value, measures 10 times and obtains 10 values, taking the average value of 10 values is the first number Value;It when measuring second value, measures 10 times and obtains 10 values, taking the average value of 10 values is second value.
Further, iron core grounding current monthly is carried out to running transformer and measures work.
The invention has the benefit that
1, true measurement of a reference value as iron core grounding current is subtracted using measured value, transformer when having subtracted measurement Magnetic flux caused by the electromagnetic induction of itself has accurately measured the magnetic flux of transformer iron core grounding current generation, has made Earth current numerical value is accurate.
2, it when the transformer iron core grounding current of measurement is greater than 100mA, is analyzed, checks that measuring instrumentss indicate whether Whether correct or measurement method is appropriate, if has the electromagnetic induction of other equipment, eliminates the influence of other failure brings;
3, when electric current is greater than 100mA, resistance is sealed in iron core grounding circuit and carries out current limliting, limitation iron core maximum current exists 300mA is hereinafter, by transformer pendant-core examination, increasing insulation distance or replacing the insulating element of damage to be handled, in time Ground connection defect is eliminated, the normal work of the transformer of guarantee ensure that the stabilization of electric power networks.
4, easy to operate using the iron core grounding current of clamp on amperemeter measuring transformer, it is at low cost, it is practical, it can To be widely used in various environment, facilitate popularization.
5, iron core grounding current periodically is carried out to running transformer and measures work, convenient for finding the problem in time.
Detailed description of the invention:
Fig. 1 is the schematic diagram of clamp on amperemeter work.
Fig. 2 is the flow chart of transformer iron core grounding current measurement method of the present invention.
Specific embodiment:
The invention will be further described with reference to the accompanying drawings and examples.
Pincerlike meter is substantially by a current transformer, pincerlike spanner and a rectifier type magnetoelectricity series reaction force instrument It is formed.For the working principle of split-core type meter as transformer, primary coil is exactly the conducting wire across clamp iron core, is equivalent to 1 circle Transformer primary coil, this is a step-up transformer.Secondary coil and measuring ammeter constitute secondary circuit.When When conducting wire has alternating current to pass through, it is exactly that this circle coil produces alternating magnetic field, induced current is produced in secondary circuit, The size of electric current and the ratio of primary current, are equivalent to the inverse ratio of the number of turns of primary and secondary coil.Clamp ammeter is for surveying High current is measured, if electric current is not big enough, a conducting wire can increased into circle number, while the electric current number that will be measured by split-core type meter Divided by circle number.The vice-side winding of the straight-through current transformer of clamp on amperemeter be wrapped on iron core and with alternating current ammeter phase Even, its primary side winding is the measured wire across mutual inductor center.Knob is actually a range switch, spanner Effect be open and close punching mutual inductor iron core moving part, to clamp it into measured wire.
Clamp on amperemeter is divided into mechanical clamp on amperemeter or digital clamp on amperemeter.It is as shown in Figure 1 mechanical pincers The working principle diagram of shape ammeter, 1 is ammeter, and 2 be current transformer, and 3 be iron core, and 4 be handle, and 5 be secondary winding, and 6 are Measured wire, 7 be range switch.When measuring electric current, by wrench, jaw is opened, tested current carrying conductor is placed in punching electricity The centre of current transformer, when having alternating current to pass through in measured wire, the magnetic flux of alternating current is in mutual inductor vice-side winding Electric current is induced, which passes through the coil of electromagnetic type ammeter, so that pointer is deflected, points out to be tested on dial plate scale Current value.
As shown in Fig. 2, being the flow chart of transformer iron core grounding current measurement method of the present invention.
Embodiment 1
The 1 specific measuring process of transformer iron core grounding current measurement method of the embodiment of the present invention are as follows: 1) using mechanical pincers Shape ammeter carries out on-line measurement work to running transformer iron core grounding current;It is measured using mechanical clamp on amperemeter When Ying Fangping, eyes want the instrument board part of face clamp on amperemeter when reading.2) clamp on amperemeter is abutted into iron core grounding pole, Measurement obtains the first numerical value, and the first numerical value is a reference value, the error generated for correcting measurement.3) clamp on amperemeter is surround Second value, second value, that is, iron core grounding current actual measured value are arrived in iron core grounding pole, measurement.4) second value subtracts First numerical value obtains third value, and third value is the true value of transformer iron core grounding current;Because of measuring transformer iron Core earth current is carried out in the case where transformer belt electricity operation, when measurement, by the magnetic flux of clamp on amperemeter, and existing change Magnetic flux caused by depressor iron core grounding current also has magnetic flux caused by the electromagnetic induction of transformer itself, these two aspects Magnetic flux is mutually superimposed, acts on clamp on amperemeter, causes the inaccuracy of numerical value measured by clamp on amperemeter;By first will be pincerlike For ammeter close to earthing pole, the first numerical value measured reflects magnetic flux caused by the electromagnetic induction of transformer itself, Measure the electromagnetic induction that obtained second value reflects magnetic flux and transformer caused by transformer iron core grounding current itself Generated magnetic flux subtracts the first numerical value with second value and obtains third value, and as transformer iron core grounding current is true Measured value reduces the influence of magnetic flux produced by the electromagnetic induction of transformer itself in this way, the iron core grounding electricity for obtaining measurement The value of stream is accurate.5) it when third value is greater than 100mA, is analyzed, checks that measuring instrumentss indicate whether correct or measurement Whether method is appropriate, if having the electromagnetic induction of other equipment influences;If confirmation is that transformer iron core grounding current is greater than regulation Defined electric current, on-call maintenance processing;6) when third value is greater than 100mA, resistance progress is sealed in iron core grounding circuit Current limliting limits iron core maximum current in 300mA or less;By transformer pendant-core examination, increases insulation distance or replace damage Insulating element is handled, and eliminates ground connection defect in time.Iron core grounding current measurement monthly is carried out to running transformer Work;By periodic detection, the failure of transformer is found in time, eliminates ground connection defect, the normal work of the transformer of guarantee in time Make, ensure that the stabilization of electric power networks.
Embodiment 2
The 2 specific measuring process of transformer iron core grounding current measurement method of embodiment is substantially the same manner as Example 1, difference It is, step 2, when measuring the first numerical value, repeatedly measurement obtains multiple numerical value, and taking the average value of the multiple numerical value is first Numerical value, preferred measurement 10 times, taking the average value of 10 values is the first numerical value;Step 3) when measuring second value, repeatedly measures Multiple numerical value are obtained, taking the average value of the multiple numerical value is second value, and preferred measurement 10 times takes the average value of 10 values For the first numerical value.It is transformer core grounding electricity that thus obtained second value, which subtracts the third value that the first numerical value obtains to be, The true value of stream.By repeatedly measuring, takes their average value as the first numerical value, second value, can reduce so random The bring error of measurement, further improves the accuracy of the transformer iron core grounding current of measurement.Preferably, for first Numerical value and second value all measure 10 times, and taking the average value of 10 values is the first numerical value and second value.Pendulous frequency is excessive, Workload is increased, human cost is improved, pendulous frequency is very few, and stability is poor, is easy to appear random deviation.
The present invention uses the iron core grounding current of clamp on amperemeter measuring transformer, easy to operate, at low cost, practicability By force, it can be widely applied in various environment, facilitate popularization;A reference value is subtracted as the true of iron core grounding current using measured value Magnitude is surveyed, magnetic flux caused by the electromagnetic induction of transformer itself, has accurately measured transformer core when having subtracted measurement The magnetic flux that earth current generates, the earth current numerical value made are accurate.Iron core grounding periodically is carried out to running transformer Current measurement work, convenient for finding the problem in time.

Claims (10)

1. a kind of measurement method of transformer iron core grounding current characterized by comprising 1) using transformer core grounding electricity Stream In-circiut tester measures, and is measured using clamp on amperemeter;2) clamp on amperemeter is abutted into iron core grounding pole, measurement obtains First numerical value;3) by clamp on amperemeter wound core earthing pole, conducting wire is made to be in the center of jaw, measurement obtains the second number Value;4) the first numerical value being subtracted with second value and obtaining third value, third value is transformer iron core grounding current;5) when It when three numerical value are greater than 100mA, is analyzed, checks that measuring instrumentss indicate whether correct or measurement method is appropriate, if Having the electromagnetic induction of other equipment influences, if confirmation is that transformer iron core grounding current is greater than electric current as defined in regulation, ties up in time Repair processing;6) resistance is sealed in iron core grounding circuit and carries out current limliting, limits iron core maximum current in 300mA or less;Pass through change Depressor pendant-core examination increases the insulating element of insulation distance or replacement damage to be handled, and eliminates ground connection defect in time.
2. measurement method according to claim 1, which is characterized in that the clamp on amperemeter is mechanical clamp on amperemeter Or digital clamp on amperemeter.
3. measurement method according to claim 1, which is characterized in that the clamp on amperemeter can store multiple groups measurement number According to.
4. measurement method according to claim 1, which is characterized in that the clamp on amperemeter have historical data read, It saves, printing function, the clamp on amperemeter has RS232 communication interface, with external communication.
5. measurement method according to claim 1, which is characterized in that be worth on the basis of first numerical value, second value is The earth current of actual measurement.
6. measurement method according to claim 5, which is characterized in that the measurement position of transformer iron core grounding extremely on Same position.
7. measurement method according to claim 1, which is characterized in that when the first numerical value of measurement, repeatedly measurement is obtained multiple Numerical value, taking the average value of the multiple numerical value is the first numerical value.
8. measurement method according to claim 1, which is characterized in that when measurement second value, repeatedly measurement is obtained multiple Numerical value, taking the average value of the multiple numerical value is second value.
9. measurement method according to claim 7 or 8, which is characterized in that when the first numerical value of measurement, measure 10 times and obtain 10 A value, taking the average value of 10 values is the first numerical value;When measuring second value, measures 10 times and obtain 10 values, take 10 values Average value is second value.
10. measurement method according to claim 1, which is characterized in that monthly carry out iron core to running transformer and connect Earth-current measures work.
CN201610485031.XA 2016-06-28 2016-06-28 A kind of measurement method of transformer iron core grounding current Active CN106199164B (en)

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