CN108710098A - A kind of secondary loop of mutual inductor load detection method - Google Patents
A kind of secondary loop of mutual inductor load detection method Download PDFInfo
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- CN108710098A CN108710098A CN201810476862.XA CN201810476862A CN108710098A CN 108710098 A CN108710098 A CN 108710098A CN 201810476862 A CN201810476862 A CN 201810476862A CN 108710098 A CN108710098 A CN 108710098A
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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
Abstract
The present invention provides a kind of secondary loop of mutual inductor load detection method, including：The indoor load to be measured of protection is selected, in the outdoor contact for determining the corresponding phase line of load to be measured and its corresponding terminal row of protection；Voltage-drop loading instrument and ammeter are provided, and the two is serially connected on the correspondence cable of load to be measured；It obtains terminal block and forms the connection type of connected loop with to be measured load, obtain the electricity that voltage-drop loading instrument accordingly loads, and the electric current for reading the voltage and current table of voltage-drop loading instrument calculates the impedance of load to be measured；Wherein, connection type is that current transformer ontology is serially connected with terminal block contact and terminal block N phases contact that load to be measured connects or the terminal block contact and terminal block N phase contact short circuits that connect load to be measured.The implementation present invention can overcome the problems, such as that the position distribution for connecting the terminal block of current transformer is moved detecting instrument compared with repetition when disperseing and accessed, not only time saving and energy saving, moreover it is possible to avoid detecting instrument from burning risk and reduce detection error.
Description
Technical field
The present invention relates to relay protection detection technique field more particularly to a kind of secondary loop of mutual inductor load detectings
Method.
Background technology
Relay protection examination and protection examine in, will to protect room side secondary loop of mutual inductor load into
Row detection.
In the prior art, secondary loop of mutual inductor load detecting is usually all the outside in protection room and close guarantor
The live on the spot of room is protected, detecting instrument is removed to current transformer terminal block just nearby and by current transformer terminal block
Phase line contact carries out dosage test to secondary loop of mutual inductor to realize, or detecting instrument is removed to current transformer
Ontology just nearby and accesses in secondary loop of mutual inductor and directly to detect to realize.
As depicted in figs. 1 and 2, entire secondary loop of mutual inductor includes the current transformer sheet for being located at protection outdoor
Body CT and terminal block D, and the protective device B positioned at protection chamber interior.To detect the current transformer for protecting room side in A phase lines
It is illustrated for secondary circuit load.First, the connection between the B phases and C phases of protective device B and terminal block N is disconnected；Its
It is secondary, by detecting instrument（Including voltage-drop loading instrument M and ammeter T）It removes to the outside of protection room and close to the existing on the spot of protection room
；Then, the A phases contact of the anode access terminal block D of voltage-drop loading instrument M and its cathode are accessed to the N phase contacts of terminal block D,
Ammeter T is serially connected in secondary loop of mutual inductor；Then, if access current transformer ontology CT, by current transformer sheet
The both ends of body CT are separately connected the A phases contact and N phase contacts of terminal block D, and voltage-drop loading instrument M is as common voltmeter at this time
（The electricity loaded is 0）, read the voltage U that voltage-drop loading instrument M the is shown and electric current I that ammeter T is shown；If not accessing electric current
Mutual inductor ontology CT, then for voltage-drop loading instrument M to load certain electricity, reading voltage-drop loading instrument M loads the electricity shown after electricity
The electric current I that pressure U and its corresponding current table T is shown；Finally, it is shown according to the voltage-drop loading instrument M voltage U shown and ammeter T
Electric current I calculates impedance Z=U/I=Z1+Z2 of the secondary loop of mutual inductor load of protection room side；Wherein, Z1 is that electric current is mutual
The equiva lent impedance of A phases cable L in sensor secondary circuit；Z2 is the equiva lent impedance of protective device B.
However, it is found by the inventors that using existing secondary loop of mutual inductor load detection method, there are many deficiencies
Place, disadvantage is that：Once the position setting for connecting the terminal block of current transformer relatively disperses, it is necessary to often detect one
It is secondary to move one-time detection instrument again, it is not only time-consuming and laborious in this way, it is also possible to mistake occur because of each new wiring, to lead
It causes final detection result error occur, even causes detecting instrument short-circuit because of false wiring so that detecting instrument, which has, to be burnt
Risk.Therefore, it is necessary to improve to existing secondary loop of mutual inductor load detection method.
Invention content
Technical problem to be solved of the embodiment of the present invention is, provides a kind of secondary loop of mutual inductor load detecting
Method repeats to move what detecting instrument was accessed when can overcome the position distribution of the terminal block of connection current transformer compared with dispersion
Problem, it is not only time saving and energy saving, moreover it is possible to avoid detecting instrument from burning risk and reduce detection error.
In order to solve the above-mentioned technical problem, an embodiment of the present invention provides a kind of secondary loop of mutual inductor load detectings
Method draws three-phase and four-line access protective device through terminal block for current transformer ontology and is formed by Current Transformer Secondary
On circuit；Wherein, the current transformer ontology and the terminal block may be contained within protection outdoor, and be set in the terminal block
There are A phases contact, B phases contact, C phases contact and N phase contacts；The protective device is set to the protection chamber interior, and by right
Four cables are answered to be respectively connected with A phases contact, B phases contact, C phases contact and the N phase contacts in the terminal block；Wherein,
It the described method comprises the following steps：
Step S1, the load to be measured of the protection chamber interior is selected, and further determines described wait in the protection outdoor
Survey the contact of the corresponding phase line drawn by current transformer ontology of load and its terminal block being correspondingly connected with；Wherein, the electric current
The phase line that mutual inductor ontology is drawn includes A phase lines, B phase lines and C phase lines；It is described it is to be measured load include the protective device and its with
The cable of a connection among the A phases contact of the terminal block, B phases contact, C phase contacts；
Step S2, a voltage-drop loading instrument and an ammeter are provided as detecting instrument, and by the voltage-drop loading instrument and the electricity
Flow table is serially connected in the load to be measured and is connected on the correspondence cable of terminal block by protective device；
Step S3, the connection type that the terminal block forms connected loop with the load to be measured is obtained, and according to accessed
Terminal block correspond to be measured load and form the connection type of connected loop, obtain the electricity that the voltage-drop loading instrument accordingly loads,
And electric current that the voltage shown after voltage-drop loading instrument load electricity and ammeter are shown further is read to calculate
State the impedance of load to be measured；Wherein, the terminal block corresponds to be measured load and forms the connection type of connected loop as the first connection
Mode or the second connection type；First connection type is that the current transformer ontology is serially connected with the load pair to be measured
It answers between the contact of connection terminal row and the N phase contacts of the terminal block so that the terminal block is formed with the load to be measured
Connected loop；Second connection type is to be correspondingly connected with the load to be measured after disconnecting the current transformer ontology
The contact of terminal block and the N phase contacts of the terminal block are shorted together so that the terminal block is formed with the load to be measured
Connected loop.
Wherein, the step S3 is specifically included：
It is correspondingly connected with the contact of terminal block and the end when the current transformer ontology is serially connected with the load to be measured by use
When the first connection type between the N phase contacts of son row, the electricity for obtaining voltage-drop loading instrument load is 0；
It is read from the voltage-drop loading instrument by the first voltage of current transformer ontology output display, and from the electricity
Read in flow table by the first electric current of current transformer ontology output display, and according to the first voltage read out and
First electric current calculates the impedance of the load to be measured.
Wherein, the step S3 is also specifically included：
After using the current transformer ontology is disconnected, the load to be measured is correspondingly connected with the contact of terminal block and the end
When the second connection type that the N phase contacts of son row are shorted together, the electricity for obtaining the voltage-drop loading instrument load is more than 0
Numerical value；
The second of display is exported after loading the electricity of the numerical value by the voltage-drop loading instrument from reading in the voltage-drop loading instrument
Voltage, and export the second of display after loading the electricity of the numerical value by the voltage-drop loading instrument from reading in the ammeter
Electric current, and according to the second voltage read out and the second electric current, calculate the impedance of the load to be measured.
Implement the embodiment of the present invention, has the advantages that：
It compares with traditional secondary loop of mutual inductor load detection method, the present invention is by detecting instrument（Including voltage plus
Carry instrument and ammeter）It is set to protection interior and is serially connected on the cable of load connection to be measured, and outdoor is protected to pass through conducting wire
Terminal block is connected into the contact of load to be measured and N phases thereon carry out short circuit or access terminal block connection by current transformer waiting for
Survey the contact and N phases thereon of load, you can realize the detection loaded to secondary loop of mutual inductor, it is no longer necessary in terminal
Repetition is moved detecting instrument and is accessed when the position distribution of row is relatively disperseed, and when even to test different loads to be measured, also only needs
Again detecting instrument is serially connected on the cable of the indoor other load connections to be measured of protection, protects shorting stub and the electric current of outdoor
The connection of mutual inductor also only needs accordingly to adjust, therefore not only time saving and energy saving, moreover it is possible to avoid detecting instrument burn risk and
Reduce detection error.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to
These attached drawings obtain other attached drawings and still fall within scope of the invention.
Fig. 1 is the circuit connection for the secondary loop of mutual inductor load for detecting protection room side in A phase lines in the prior art
Schematic diagram；
Fig. 2 is the equivalent circuit diagram of Fig. 1；
Fig. 3 is the flow chart of secondary loop of mutual inductor load detection method provided in an embodiment of the present invention；
Fig. 4 is an application scenario diagram of secondary loop of mutual inductor load detection method provided in an embodiment of the present invention；
Fig. 5 is the another application scene graph of secondary loop of mutual inductor load detection method provided in an embodiment of the present invention.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
As shown in figure 3, in the embodiment of the present invention, a kind of secondary loop of mutual inductor load detection method provided,
Three-phase and four-line access protective device B is drawn through terminal block N be formed by Current Transformer Secondary for current transformer ontology CT
On circuit（As shown in Figure 1）；Wherein, current transformer ontology CT and terminal block N may be contained within protection outdoor, and terminal block N
It is equipped with A phases contact, B phases contact, C phases contact and N phase contacts；Protective device B is set to protection chamber interior, and passes through corresponding four
Cable is respectively connected with A phases contact, B phases contact, C phases contact and the N phase contacts on terminal block N；Wherein,
It the described method comprises the following steps：
Step S1, the load to be measured of the protection chamber interior is selected, and further determines described wait in the protection outdoor
Survey the contact of the corresponding phase line drawn by current transformer ontology of load and its terminal block being correspondingly connected with；Wherein, the electric current
The phase line that mutual inductor ontology is drawn includes A phase lines, B phase lines and C phase lines；It is described it is to be measured load include the protective device and its with
The cable of a connection among the A phases contact of the terminal block, B phases contact, C phase contacts；
Detailed process is in the indoor selection of protection load to be measured, that is, to select protective device and a certain phase of protective device and terminal
The cable that corresponding contact is connected is arranged, it can thus be derived that the phase line that selected load connection current transformer ontology to be measured is drawn
With the contact of terminal block.
In one embodiment, load to be measured is that the A of A connecting terminals row in protective device and the protective device connects
The cable of point derives that the phase line that current transformer ontology is drawn is A phase lines, and the contact of the terminal block of connection is A phase contacts.
Step S2, a voltage-drop loading instrument and an ammeter are provided as detecting instrument, and by the voltage-drop loading instrument and institute
It states ammeter and is serially connected in the load to be measured and be connected on the correspondence cable of terminal block by protective device；
Detailed process is that voltage-drop loading instrument and ammeter need to be only serially connected in load to be measured by conducting wire or cable and be filled by protection
It sets on the correspondence cable for being connected to terminal block, for example A connecting terminals row A connects in test protective device and the protective device
When the impedance of the cable of point, voltage-drop loading instrument and ammeter are serially connected in A connecting terminals in the protective device and arrange A phase contacts
On cable.
It is understood that in order to enable voltage-drop loading instrument and ammeter concatenation are convenient, it can be corresponding in load to be measured
The connection sheet of disconnection is set on cable, voltage-drop loading instrument and ammeter are serially connected in the both ends of connection sheet.
Step S3, it obtains the terminal block and forms the connection type of connected loop with to be measured load, and according to being obtained
The terminal block got corresponds to the connection type to be measured for loading and forming connected loop, obtains the electricity that the voltage-drop loading instrument accordingly loads
Amount, and the electric current that the voltage shown after the voltage-drop loading instrument load electricity and ammeter are shown further is read to calculate
The impedance of the load to be measured；Wherein, the terminal block corresponds to be measured load and forms the connection type of connected loop as the first company
Connect mode or the second connection type；First connection type is that the current transformer ontology is serially connected with the load to be measured
It is correspondingly connected between the contact of terminal block and the N phase contacts of the terminal block so that the terminal block and the load shape to be measured
At connected loop；Second connection type is after disconnecting the current transformer ontology, by the corresponding company of the load to be measured
The contact and the N phase contacts of the terminal block of connecting terminal row is shorted together so that the terminal block and the load shape to be measured
At connected loop.
Detailed process is that terminal block is formed with load to be measured there are two types of the connection types of connected loop, including short-circuited terminal
The N phases contact of row and the first connection type to be measured for loading and being correspondingly connected with the contact of terminal block and being formed, and pass through Current Mutual Inductance
The N phases contact of the both ends access terminal block of device and the second connection type to be measured for loading and being correspondingly connected with the contact of terminal block and being formed.
（1）When being correspondingly connected with the contact and terminal block of terminal block using current transformer ontology is serially connected with to be measured load
When the first connection type between N phase contacts, the electricity for obtaining the load of voltage-drop loading instrument is 0；
From voltage-drop loading instrument read by current transformer ontology output display first voltage, and from ammeter read by
First electric current of current transformer ontology output display, and according to the first voltage read out and the first electric current, calculate to be measured
The impedance of load, the electric current of impedance=first voltage of the load to be measured/first.
It should be noted that the electricity of voltage-drop loading instrument load is 0, voltage-drop loading instrument is common voltmeter at this time, this
The voltage of Shi Huilu is exported by current transformer ontology.
As shown in figure 4, in secondary loop of mutual inductor load detection method provided in an embodiment of the present invention above-mentioned the
（1）The application scenario diagram of kind situation；Wherein, U11 is first voltage, and I11 is the first electric current, and Z11 is that protection interior A is connected electricity
The equiva lent impedance of cable, Z12 are the equiva lent impedance of the indoor protective device of protection；M1 is voltage-drop loading instrument, and T1 is ammeter.
（2）After using turn-off current mutual inductor ontology, load to be measured is correspondingly connected with to the contact and terminal block of terminal block
N phase contacts be shorted together the second connection type when, the electricity for obtaining the load of voltage-drop loading instrument is numerical value more than 0；
The second voltage of display, Yi Jicong are exported after loading the electricity of the numerical value by voltage-drop loading instrument from reading in voltage-drop loading instrument
Read the second electric current that display is exported after loading the electricity of the numerical value by the voltage-drop loading instrument in ammeter, and according to reading out
Second voltage and the second electric current, calculate the impedance of load to be measured, the electric current of impedance=second voltage of the load to be measured/second.
It should be noted that voltage-drop loading instrument load electricity be more than 0, voltage-drop loading instrument is voltage source at this time, also for
Voltmeter, at this time the voltage in circuit exported by voltage-drop loading instrument.
As shown in figure 5, in secondary loop of mutual inductor load detection method provided in an embodiment of the present invention above-mentioned the
（2）The application scenario diagram of kind situation；Wherein, U21 is second voltage, and I21 is the second electric current, and Z21 is that protection interior A is connected electricity
The equiva lent impedance of cable, Z22 are the equiva lent impedance of the indoor protective device of protection；M2 is voltage-drop loading instrument, and T2 is ammeter.
Implement the embodiment of the present invention, has the advantages that：
It compares with traditional secondary loop of mutual inductor load detection method, the present invention is by detecting instrument（Including voltage plus
Carry instrument and ammeter）It is set to protection interior and is serially connected on the cable of load connection to be measured, and outdoor is protected to pass through conducting wire
Terminal block is connected into the contact of load to be measured and N phases thereon carry out short circuit or access terminal block connection by current transformer waiting for
Survey the contact and N phases thereon of load, you can realize the detection loaded to secondary loop of mutual inductor, it is no longer necessary in terminal
Repetition is moved detecting instrument and is accessed when the position distribution of row is relatively disperseed, and when even to test different loads to be measured, also only needs
Again detecting instrument is serially connected on the cable of the indoor other load connections to be measured of protection, protects shorting stub and the electric current of outdoor
The connection of mutual inductor also only needs accordingly to adjust, therefore not only time saving and energy saving, moreover it is possible to avoid detecting instrument burn risk and
Reduce detection error.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (3)
1. a kind of secondary loop of mutual inductor load detection method draws three-phase four for current transformer ontology through terminal block
Line access protective device is formed by secondary loop of mutual inductor；Wherein, the current transformer ontology and the terminal
Row may be contained within protection outdoor, and the terminal block is equipped with A phases contact, B phases contact, C phases contact and N phase contacts；It is described
Protective device is set to the protection chamber interior, and is connected with A phases contact, the B in the terminal block by corresponding four cables
Point, C phases contact and N phase contacts are respectively connected with；It is characterized in that,
It the described method comprises the following steps：
Step S1, the load to be measured of the protection chamber interior is selected, and further determines described wait in the protection outdoor
Survey the contact of the corresponding phase line drawn by current transformer ontology of load and its terminal block being correspondingly connected with；Wherein, the electric current
The phase line that mutual inductor ontology is drawn includes A phase lines, B phase lines and C phase lines；It is described it is to be measured load include the protective device and its with
The cable of a connection among the A phases contact of the terminal block, B phases contact, C phase contacts；
Step S2, a voltage-drop loading instrument and an ammeter are provided as detecting instrument, and by the voltage-drop loading instrument and the electricity
Flow table is serially connected in the load to be measured and is connected on the correspondence cable of terminal block by protective device；
Step S3, the connection type that the terminal block forms connected loop with the load to be measured is obtained, and according to accessed
Terminal block correspond to be measured load and form the connection type of connected loop, obtain the electricity that the voltage-drop loading instrument accordingly loads,
And electric current that the voltage shown after voltage-drop loading instrument load electricity and ammeter are shown further is read to calculate
State the impedance of load to be measured；Wherein, the terminal block corresponds to be measured load and forms the connection type of connected loop as the first connection
Mode or the second connection type；First connection type is that the current transformer ontology is serially connected with the load pair to be measured
It answers between the contact of connection terminal row and the N phase contacts of the terminal block so that the terminal block is formed with the load to be measured
Connected loop；Second connection type is to be correspondingly connected with the load to be measured after disconnecting the current transformer ontology
The contact of terminal block and the N phase contacts of the terminal block are shorted together so that the terminal block is formed with the load to be measured
Connected loop.
2. secondary loop of mutual inductor load detection method as described in claim 1, which is characterized in that the step S3 tools
Body includes：
It is correspondingly connected with the contact of terminal block and the end when the current transformer ontology is serially connected with the load to be measured by use
When the first connection type between the N phase contacts of son row, the electricity for obtaining voltage-drop loading instrument load is 0；
It is read from the voltage-drop loading instrument by the first voltage of current transformer ontology output display, and from the electricity
Read in flow table by the first electric current of current transformer ontology output display, and according to the first voltage read out and
First electric current calculates the impedance of the load to be measured.
3. secondary loop of mutual inductor load detection method as described in claim 1, which is characterized in that the step S3 is also
It specifically includes：
After using the current transformer ontology is disconnected, the load to be measured is correspondingly connected with the contact of terminal block and the end
When the second connection type that the N phase contacts of son row are shorted together, the electricity for obtaining the voltage-drop loading instrument load is more than 0
Numerical value；
The second of display is exported after loading the electricity of the numerical value by the voltage-drop loading instrument from reading in the voltage-drop loading instrument
Voltage, and export the second of display after loading the electricity of the numerical value by the voltage-drop loading instrument from reading in the ammeter
Electric current, and according to the second voltage read out and the second electric current, calculate the impedance of the load to be measured.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810476862.XA CN108710098B (en) | 2018-05-18 | 2018-05-18 | Current transformer secondary circuit load detection method |
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|---|---|---|---|
| CN201810476862.XA CN108710098B (en) | 2018-05-18 | 2018-05-18 | Current transformer secondary circuit load detection method |
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| CN108710098B CN108710098B (en) | 2021-02-19 |
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| CN108710098B (en) | 2021-02-19 |
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