CN108710098B - Current transformer secondary circuit load detection method - Google Patents
Current transformer secondary circuit load detection method Download PDFInfo
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- CN108710098B CN108710098B CN201810476862.XA CN201810476862A CN108710098B CN 108710098 B CN108710098 B CN 108710098B CN 201810476862 A CN201810476862 A CN 201810476862A CN 108710098 B CN108710098 B CN 108710098B
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
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- 238000002360 preparation method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
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- 230000007547 defect Effects 0.000 description 2
- 238000013100 final test Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention provides a method for detecting the load of a secondary circuit of a current transformer, which comprises the following steps: selecting a load to be tested in the protection room, and determining a phase line corresponding to the load to be tested and a contact point of a corresponding terminal strip outside the protection room; providing a voltage loading instrument and an ammeter, and connecting the voltage loading instrument and the ammeter in series on a corresponding cable of a load to be tested; obtaining a connection mode that the terminal strip and the load to be tested form a communication loop, obtaining electric quantity correspondingly loaded by the voltage loader, and reading the voltage of the voltage loader and the current of the ammeter to calculate the impedance of the load to be tested; the connection mode is that the current transformer body is connected in series with a terminal block contact and a terminal block N-phase contact which are connected with a load to be tested, or the terminal block contact and the terminal block N-phase contact which are connected with the load to be tested are in short circuit. By implementing the invention, the problem that the detection instrument is repeatedly moved to be accessed when the position distribution of the terminal strip connected with the current transformer is more dispersed can be solved, time and labor are saved, the risk of burning the detection instrument can be avoided, and the detection error is reduced.
Description
Technical Field
The invention relates to the technical field of relay protection detection, in particular to a load detection method for a secondary circuit of a current transformer.
Background
In the acceptance and protection inspection of relay protection, the load of a secondary circuit of a current transformer on the protection chamber side is detected.
In the prior art, load detection of a secondary circuit of a current transformer is generally realized by moving a detection instrument to a position near a terminal block of the current transformer and performing a quantitative test on the secondary circuit of the current transformer through a phase line contact of the terminal block of the current transformer, or by moving the detection instrument to a position near a body of the current transformer and connecting the detection instrument to the secondary circuit of the current transformer for direct detection, in a local site outside and close to a protection room.
As shown in fig. 1 and 2, the entire secondary circuit of the current transformer includes a current transformer body CT and a terminal block D located outside a protection room, and a protection device B located inside the protection room. The description will be given by taking the example of detecting the load of the secondary circuit of the current transformer on the protection chamber side on the a-phase line. Firstly, disconnecting the protection device B from the phase B and the phase C of the terminal block N; secondly, moving the detection instrument (comprising a voltage loading instrument M and an ammeter T) to the outside of the protection room and close to the on-site of the protection room; then, connecting the positive electrode of the voltage loading instrument M into the A-phase contact of the terminal block D and connecting the negative electrode of the voltage loading instrument M into the N-phase contact of the terminal block D, and connecting the ammeter T in series in a secondary circuit of the current transformer; then, if a current transformer body CT is connected, connecting the two ends of the current transformer body CT with the a-phase connection point and the N-phase connection point of the terminal row D respectively, and at this time, taking the voltage loader M as a common voltmeter (that is, the loaded electric quantity is 0), reading the voltage U displayed by the voltage loader M and the current I displayed by the ammeter T; if the current transformer body CT is not connected, the voltage loader M is used for loading certain electric quantity, and the voltage U displayed after the voltage loader M loads the electric quantity and the current I displayed by the corresponding ammeter T are read; finally, calculating the impedance Z = U/I = Z1+ Z2 of the secondary circuit load of the current transformer on the protection chamber side according to the voltage U displayed by the voltage loader M and the current I displayed by the ammeter T; wherein, Z1 is the equivalent impedance of the A-phase cable L in the secondary circuit of the current transformer; z2 is the equivalent impedance of protection device B.
However, the inventor finds that the existing current transformer secondary circuit load detection method has many defects, and the defects are as follows: once the position setting of the terminal row of connecting current transformer is more dispersed, just need detect once more and move detecting instrument once more, so not only waste time and energy, still can be because of the mistake appears in new wiring at every turn to lead to final testing result to appear the error, lead to detecting instrument short circuit even because of wrong wiring, make detecting instrument have the risk of burning out. Therefore, it is necessary to improve the existing current transformer secondary circuit load detection method.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method for detecting a load of a secondary circuit of a current transformer, which can overcome the problem that a detection instrument is repeatedly moved to access when the position distribution of a terminal strip connected to the current transformer is relatively dispersed, thereby saving time and labor, avoiding the risk of burning the detection instrument, and reducing the detection error.
In order to solve the above technical problem, an embodiment of the present invention provides a method for detecting a load of a secondary circuit of a current transformer, which is used for leading out a three-phase four-wire access protection device from a current transformer body through a terminal strip to form a secondary circuit of the current transformer; the current transformer body and the terminal strip are arranged outside the protection chamber, and an A-phase contact, a B-phase contact, a C-phase contact and an N-phase contact are arranged on the terminal strip; the protection device is arranged in the protection chamber and is respectively connected with the A-phase connection point, the B-phase connection point, the C-phase connection point and the N-phase connection point on the terminal strip through corresponding four cables; wherein,
the method comprises the following steps:
step S1, selecting a load to be tested in the protection room, and further determining the load to be tested outside the protection room corresponding to a phase line led out from the current transformer body and a contact of a terminal strip correspondingly connected with the phase line; the phase lines led out of the current transformer body comprise a phase line A, a phase line B and a phase line C; the load to be tested comprises the protection device and a cable connected with one of the A-phase connection point, the B-phase connection point and the C-phase connection point of the terminal block;
step S2, providing a voltage loading instrument and an ammeter as a detection instrument, and connecting the voltage loading instrument and the ammeter in series on a corresponding cable connected to a terminal block by a protection device in the load to be detected;
step S3, obtaining a connection mode that the terminal strip and the load to be tested form a communication loop, obtaining the electric quantity correspondingly loaded by the voltage loader according to the connection mode that the obtained terminal strip corresponds to the load to be tested to form the communication loop, and further reading the voltage displayed after the voltage loader loads the electric quantity and the current displayed by the ammeter to calculate the impedance of the load to be tested; the connection mode that the terminal strip forms a communication loop corresponding to the load to be tested is a first connection mode or a second connection mode; the first connection mode is that the current transformer body is connected in series between a contact of a corresponding connection terminal row of the load to be tested and an N-phase contact of the terminal row, so that the terminal row and the load to be tested form a communication loop; and the second connection mode is that after the current transformer body is disconnected, the connection point of the corresponding connection terminal row of the load to be tested is connected with the N-phase connection point of the terminal row in a short mode, so that the terminal row and the load to be tested form a communication loop.
Wherein, the step S3 specifically includes:
when a first connection mode that the current transformer body is connected in series between a contact point of a corresponding connection terminal row of the load to be tested and an N-phase contact point of the terminal row is adopted, the electric quantity loaded by the voltage loading instrument is 0;
reading a first voltage output and displayed by the current transformer body from the voltage loader, reading a first current output and displayed by the current transformer body from the ammeter, and calculating the impedance of the load to be measured according to the read first voltage and the read first current.
Wherein, the step S3 further specifically includes:
when a second connection mode that after the current transformer body is disconnected, the connection point of the corresponding connection terminal row of the load to be tested is connected with the N-phase connection point of the terminal row in a short mode is adopted, the numerical value that the electric quantity loaded by the voltage loading instrument is greater than 0 is obtained;
and reading the electric quantity of the numerical value loaded by the voltage loader from the voltage loader, outputting the displayed second voltage, reading the electric quantity of the numerical value loaded by the voltage loader from the ammeter, outputting the displayed second current, and calculating the impedance of the load to be tested according to the read second voltage and second current.
The embodiment of the invention has the following beneficial effects:
compared with the traditional method for detecting the load of the secondary loop of the current transformer, the invention arranges the detecting instrument (comprising a voltage loading instrument and an ammeter) in the protecting chamber and serially connects the detecting instrument with the cable connected with the load to be detected, the outside of the protecting chamber connects the terminal row with the contact of the load to be detected and the N phase on the contact to be detected for short circuit through a lead or connects the terminal row with the contact of the load to be detected and the N phase on the contact through the current transformer, thus realizing the detection of the load of the secondary loop of the current transformer, avoiding repeatedly moving the detecting instrument to access when the position distribution of the terminal row is more dispersed, only needing to serially connect the detecting instrument with the cables connected with other loads to be detected in the protecting chamber again even when different loads to be detected are detected, only needing to correspondingly adjust the short circuit outside the protecting chamber and the connection of the current transformer, thereby saving, the risk of burning out the detection instrument can be avoided, and the detection error is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic circuit connection diagram of detecting a secondary circuit load of a current transformer on a protection chamber side on an a-phase line in the prior art;
FIG. 2 is an equivalent circuit diagram of FIG. 1;
fig. 3 is a flowchart of a method for detecting a load of a secondary circuit of a current transformer according to an embodiment of the present invention;
fig. 4 is an application view of the method for detecting the load of the secondary circuit of the current transformer according to the embodiment of the present invention;
fig. 5 is a diagram of another application scenario of the method for detecting a load of a secondary circuit of a current transformer according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 3, which is a method for detecting a load of a secondary circuit of a current transformer according to an embodiment of the present invention, the method is used for leading a three-phase four-wire access protection device B out of a secondary circuit of the current transformer (as shown in fig. 1) formed by a current transformer body CT through a terminal row N; the current transformer body CT and the terminal block N are arranged outside the protection chamber, and an A-phase contact, a B-phase contact, a C-phase contact and an N-phase contact are arranged on the terminal block N; the protection device B is arranged in the protection chamber and is respectively connected with the phase A connection point, the phase B connection point, the phase C connection point and the phase N connection point on the terminal block N through corresponding four cables; wherein,
the method comprises the following steps:
step S1, selecting a load to be tested in the protection room, and further determining the load to be tested outside the protection room corresponding to a phase line led out from the current transformer body and a contact of a terminal strip correspondingly connected with the phase line; the phase lines led out of the current transformer body comprise a phase line A, a phase line B and a phase line C; the load to be tested comprises the protection device and a cable connected with one of the A-phase connection point, the B-phase connection point and the C-phase connection point of the terminal block;
the specific process is that the load to be tested is selected in the protection chamber, namely the protection device and a cable of which a certain phase is connected with the corresponding contact of the terminal strip are selected, so that the contact of the phase line and the terminal strip led out by the selected load to be tested and connected with the current transformer body can be deduced.
In one embodiment, the load to be measured is a protection device and a cable of an a-phase connection point of an a-phase connection terminal block on the protection device, a phase line led out from a current transformer body is deduced to be an a-phase line, and a connection point of the connected terminal block is the a-phase connection point.
Step S2, providing a voltage loading instrument and an ammeter as a detection instrument, and connecting the voltage loading instrument and the ammeter in series on a corresponding cable connected to a terminal block by a protection device in the load to be detected;
the specific process is that the voltage loading instrument and the ammeter are connected in series to the corresponding cable connected to the terminal block by the protection device in the load to be tested through a wire or a cable, for example, when the impedance of the protection device and the cable connected to the a-phase connection point of the a-phase connection terminal block on the protection device is tested, the voltage loading instrument and the ammeter are connected in series to the cable connected to the a-phase connection point of the a-phase connection terminal block on the protection device.
It can be understood that, in order to facilitate the serial connection of the voltage loading instrument and the ammeter, a disconnected connecting sheet may be disposed on the cable corresponding to the load to be measured, and the voltage loading instrument and the ammeter are connected in series at two ends of the connecting sheet.
Step S3, obtaining a connection mode that the terminal strip and the load to be tested form a communication loop, obtaining the electric quantity correspondingly loaded by the voltage loader according to the connection mode that the obtained terminal strip corresponds to the load to be tested to form the communication loop, and further reading the voltage displayed after the voltage loader loads the electric quantity and the current displayed by the ammeter to calculate the impedance of the load to be tested; the connection mode that the terminal strip forms a communication loop corresponding to the load to be tested is a first connection mode or a second connection mode; the first connection mode is that the current transformer body is connected in series between a contact of a corresponding connection terminal row of the load to be tested and an N-phase contact of the terminal row, so that the terminal row and the load to be tested form a communication loop; and the second connection mode is that after the current transformer body is disconnected, the connection point of the corresponding connection terminal row of the load to be tested is connected with the N-phase connection point of the terminal row in a short mode, so that the terminal row and the load to be tested form a communication loop.
The specific process is that two connection modes of the terminal row and the load to be measured for forming a communication loop are provided, including a first connection mode formed by an N-phase contact of the short-circuit terminal row and a contact of the load to be measured corresponding to the connection terminal row, and a second connection mode formed by the N-phase contact of the two ends of the current transformer connected to the terminal row and the contact of the load to be measured corresponding to the connection terminal row.
(1) When a first connection mode that the current transformer body is connected in series between the contact of the corresponding connection terminal row of the load to be tested and the N-phase contact of the terminal row is adopted, the electric quantity loaded by the voltage loading instrument is 0;
reading a first voltage output and displayed by the current transformer body from the voltage loader, reading a first current output and displayed by the current transformer body from the ammeter, and calculating the impedance of the load to be tested according to the read first voltage and the read first current, wherein the impedance of the load to be tested = first voltage/first current.
It should be noted that the electric quantity loaded by the voltage loader is 0, at this time, the voltage loader is a common voltmeter, and at this time, the voltage of the loop is output by the current transformer body.
As shown in fig. 4, it is an application scenario diagram of the situation (1) in the method for detecting a load of a secondary circuit of a current transformer according to the embodiment of the present invention; wherein, U11 is a first voltage, I11 is a first current, Z11 is the equivalent impedance of the cable connected with A in the protection room, and Z12 is the equivalent impedance of the protection device in the protection room; m1 is a voltage loader, and T1 is an ammeter.
(2) When a second connection mode that after the current transformer body is disconnected, the connection point of the corresponding connection terminal row of the load to be tested is connected with the N-phase connection point of the terminal row in a short mode is adopted, the numerical value that the electric quantity loaded by the voltage loading instrument is greater than 0 is obtained;
reading the electric quantity of the value loaded by the voltage loader from the voltage loader, outputting and displaying a second voltage, reading the electric quantity of the value loaded by the voltage loader from the ammeter, outputting and displaying a second current, and calculating the impedance of the load to be tested according to the read second voltage and the second current, wherein the impedance of the load to be tested = second voltage/second current.
It should be noted that, the electric quantity loaded by the voltage loader is greater than 0, at this time, the voltage loader is a voltage source, and is also a voltmeter, and at this time, the voltage of the loop is output by the voltage loader.
As shown in fig. 5, it is an application scenario diagram of the situation (2) in the method for detecting a load of a secondary circuit of a current transformer according to the embodiment of the present invention; wherein, U21 is a second voltage, I21 is a second current, Z21 is an equivalent impedance of a cable connected to a phase in the protection room, and Z22 is an equivalent impedance of the protection device in the protection room; m2 is a voltage loader, and T2 is an ammeter.
The embodiment of the invention has the following beneficial effects:
compared with the traditional method for detecting the load of the secondary loop of the current transformer, the invention arranges the detecting instrument (comprising a voltage loading instrument and an ammeter) in the protecting chamber and serially connects the detecting instrument with the cable connected with the load to be detected, the outside of the protecting chamber connects the terminal row with the contact of the load to be detected and the N phase on the contact to be detected for short circuit through a lead or connects the terminal row with the contact of the load to be detected and the N phase on the contact through the current transformer, thus realizing the detection of the load of the secondary loop of the current transformer, avoiding repeatedly moving the detecting instrument to access when the position distribution of the terminal row is more dispersed, only needing to serially connect the detecting instrument with the cables connected with other loads to be detected in the protecting chamber again even when different loads to be detected are detected, only needing to correspondingly adjust the short circuit outside the protecting chamber and the connection of the current transformer, thereby saving, the risk of burning out the detection instrument can be avoided, and the detection error is reduced.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (1)
1. A load detection method for a secondary circuit of a current transformer is used for leading a three-phase four-wire access protection device out of a current transformer body through a terminal strip to form a secondary circuit of the current transformer; the current transformer body and the terminal strip are arranged outside the protection chamber, and an A-phase contact, a B-phase contact, a C-phase contact and an N-phase contact are arranged on the terminal strip; the protection device is arranged in the protection chamber and is respectively connected with the A-phase connection point, the B-phase connection point, the C-phase connection point and the N-phase connection point on the terminal strip through corresponding four cables; it is characterized in that the preparation method is characterized in that,
the method comprises the following steps:
step S1, selecting a load to be tested in the protection room, and further determining the load to be tested outside the protection room corresponding to a phase line led out from the current transformer body and a contact of a terminal strip correspondingly connected with the phase line; the phase lines led out of the current transformer body comprise a phase line A, a phase line B and a phase line C; the load to be tested comprises the protection device and a cable connected with one of the A-phase connection point, the B-phase connection point and the C-phase connection point of the terminal block;
step S2, providing a voltage loading instrument and an ammeter as a detection instrument, and connecting the voltage loading instrument and the ammeter in series on a corresponding cable connected to a terminal block by a protection device in the load to be detected;
step S3, obtaining a connection mode that the terminal strip and the load to be tested form a communication loop, obtaining the electric quantity correspondingly loaded by the voltage loader according to the connection mode that the obtained terminal strip corresponds to the load to be tested to form the communication loop, and further reading the voltage displayed after the voltage loader loads the electric quantity and the current displayed by the ammeter to calculate the impedance of the load to be tested; the connection mode that the terminal strip forms a communication loop corresponding to the load to be tested is a second connection mode; the second connection mode is that after the current transformer body is disconnected, the connection point of the connection terminal row corresponding to the load to be tested is connected with the N-phase connection point of the terminal row in a short mode, so that the terminal row and the load to be tested form a communication loop;
wherein, the step S3 specifically includes:
when a second connection mode that after the current transformer body is disconnected, the connection point of the corresponding connection terminal row of the load to be tested is connected with the N-phase connection point of the terminal row in a short mode is adopted, the numerical value that the electric quantity loaded by the voltage loading instrument is greater than 0 is obtained;
and reading the electric quantity of the numerical value loaded by the voltage loader from the voltage loader, outputting the displayed second voltage, reading the electric quantity of the numerical value loaded by the voltage loader from the ammeter, outputting the displayed second current, and calculating the impedance of the load to be tested according to the read second voltage and second current.
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