CN107132463A - Secondary windings of PT short-circuit preventing device - Google Patents
Secondary windings of PT short-circuit preventing device Download PDFInfo
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- CN107132463A CN107132463A CN201710432223.9A CN201710432223A CN107132463A CN 107132463 A CN107132463 A CN 107132463A CN 201710432223 A CN201710432223 A CN 201710432223A CN 107132463 A CN107132463 A CN 107132463A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The secondary windings of PT short-circuit preventing device that the present invention is provided; between secondary windings of PT and voltage transformer sampling unit measuring loop; including air switch, binding post and protection circuit plate, protection circuit plate includes major loop resistance, protective resistance, light emitting diode and fuse；Wherein, the live wire and zero line of secondary windings of PT are accessed in the end of incoming cables of air switch; the leading-out terminal of air switch accesses one end of major loop resistance; the other end of major loop resistance and one end of fuse are connected; the other end of fuse access binding post end of incoming cables while and protective resistance one end or light emitting diode positive pole connect; the other end of protective resistance or the negative pole of light emitting diode access the end of incoming cables of binding post, and the leading-out terminal of binding post accesses the live wire and zero line of voltage transformer sampling unit measuring loop.The present invention can eliminate the potential safety hazard that test loop short circuit causes secondary windings of PT short circuit.
Description
Technical field
The invention belongs to electro-engineering technical field, a kind of anti-short circuit dress of secondary windings of PT is especially related to
Put.
Background technology
Capacitance type equipment insulation on-line monitoring system is mainly measurement 220kV sleeve of main transformer, current transformer, coupled capacitor
Tg δ, Cx (pF) of the capacitance type equipments such as device, and zinc oxide lightning arrester block property current and total current, it is above-mentioned by comparative analysis
Aggregation of data judges the insulation status of capacitance type equipment.
Capacitance type equipment insulation on-line monitoring system is mainly sampled single by voltage transformer sampling unit and tested device
Member measures the leakage current vector that busbar voltage vector sum flows through test item, then by cable passage that all test signals are defeated
Enter main frame and carry out data processing and analysis calculating.But voltage transformer secondary electricity is being measured by voltage transformer sampling unit
During pressure, destroyed by external force due to signalling channel, the factor such as artificial maloperation and tester failure when often result in voltage transformer
The generation of secondary winding short trouble, once occurring short trouble, secondary winding can produce very big short circuit current flow scaling loss voltage
Transformer, has a strong impact on the stability and security of system.
The content of the invention
The technical problems to be solved by the invention are：A kind of secondary windings of PT short-circuit preventing device is provided, to solve
The problem of certainly causing scaling loss voltage transformer because of secondary windings of PT short circuit.
The secondary windings of PT short-circuit preventing device that the present invention is provided, installed in secondary windings of PT and electricity
Press between transformer sampling unit measuring loop, including air switch, binding post and protection circuit plate, protection circuit plate include
Major loop resistance, protective resistance, light emitting diode and fuse；Wherein, the end of incoming cables access voltage transformer two of air switch
The live wire and zero line of secondary winding, the leading-out terminal of air switch access one end of major loop resistance, the other end of major loop resistance with
One end connection of fuse, the other end of fuse while the end of incoming cables of binding post is accessed and protective resistance one end or
The positive pole connection of light emitting diode, the other end of protective resistance or the negative pole of light emitting diode access the end of incoming cables of binding post,
The leading-out terminal of binding post accesses the live wire and zero line of voltage transformer sampling unit measuring loop.
Furthermore it is preferred that scheme be, voltage transformer include the first secondary winding, the second secondary winding and the three or two time around
Group, the first secondary winding includes live wire A and zero line N, and the second secondary winding includes live wire B and zero line N, and the 3rd secondary winding includes
Live wire C and zero line N；Voltage transformer sampling unit measuring loop includes the first measuring loop, the second measuring loop and the 3rd and surveyed
Loop is measured, the first measuring loop includes live wire a and zero line n, and the second measuring loop includes live wire b and zero line n, the 3rd measuring loop
Including live wire c and zero line n；Air switch includes the first via, the second tunnel, the 3rd road and the 4th tunnel；Binding post include the first hole,
Second hole, the 3rd hole and the 4th hole；Major loop resistance includes the first major loop resistance, the second major loop resistance and the 3rd major loop
Resistance；Protective resistance includes the first protective resistance, the second protective resistance, the 3rd protective resistance and the 4th protective resistance；Fuse
Including first fuse, second fuse and the 3rd fuse；Light emitting diode includes the first light emitting diode, second luminous two
Pole pipe and the 3rd light emitting diode；And, the live wire of the first secondary winding, the leading-out terminal of the first via are accessed in the end of incoming cables of the first via
One end of the first major loop resistance is accessed, the other end of the first major loop resistance and one end of first fuse are connected, and first melts
The other end of disconnected device accesses the end of incoming cables in the first hole and is connected with one end of the first protective resistance, the first protective resistance it is another
End is connected with the positive pole of the first light emitting diode, and the negative pole of the first light emitting diode is connected with one end of the 4th protective resistance, the
The other end of four protective resistances is connected with the end of incoming cables in the 4th hole, and the leading-out terminal in the 4th hole accesses the zero line of the first measuring loop,
The live wire of first measuring loop accesses the leading-out terminal in the first hole；The live wire of the second secondary winding is accessed in the end of incoming cables on the second tunnel, the
The leading-out terminal on two tunnels accesses one end of the second major loop resistance, the other end of the second major loop resistance and one end of second fuse
Connection, the other end of second fuse accesses the end of incoming cables in the second hole and is connected with one end of the second protective resistance, and second protects
The other end of shield resistance is connected with the positive pole of the second light emitting diode, the negative pole of the second light emitting diode and the 4th protective resistance
One end is connected, and the other end of the 4th protective resistance is connected with the end of incoming cables in the 4th hole, and the leading-out terminal access second in the 4th hole is measured
The zero line in loop, the live wire of the second measuring loop accesses the leading-out terminal in the second hole；The end of incoming cables on the 3rd tunnel access the three or two time around
The live wire of group, the leading-out terminal on the 3rd tunnel accesses one end of the 3rd major loop resistance, the other end and the 3rd of the 3rd major loop resistance
One end connection of fuse, the other end of the 3rd fuse accesses the end of incoming cables in the 3rd hole and one end with the 3rd protective resistance
Connection, the other end of the 3rd protective resistance is connected with the positive pole of the 3rd light emitting diode, the negative pole of the 3rd light emitting diode and the
One end connection of four protective resistances, the other end of the 4th protective resistance is connected with the end of incoming cables in the 4th hole, the leading-out terminal in the 4th hole
The zero line of the 3rd measuring loop is accessed, the live wire of the 3rd measuring loop accesses the leading-out terminal in the 3rd hole；The end of incoming cables on the 4th tunnel point
Do not access the zero line of the first secondary winding, the second secondary winding and the 3rd secondary winding, the leading-out terminal on the 4th tunnel by wire with
The end of incoming cables in the 4th hole is connected.
Additionally, it is preferred that scheme be that first fuse, second fuse and the rated current of the 3rd fuse are
0.5A；The resistance of first major loop resistance, the second major loop resistance and the 3rd major loop resistance is 20 Ω；First protection electricity
The resistance of resistance, the second protective resistance and the 3rd protective resistance is 2400 Ω, and the resistance of the 4th protective resistance is 120 Ω；First
The operating current of light emitting diode, the second light emitting diode and the 3rd light emitting diode is 20mA.
Furthermore, scheme preferably is that secondary windings of PT short-circuit preventing device also includes being arranged on voltage transformer
Epoxy resin board in terminal box, air switch, binding post and protection circuit plate are separately fixed on epoxy resin board.
By above-mentioned design, the present invention can bring following beneficial effect：
1st, the potential safety hazard of secondary windings of PT short circuit caused by the short circuit of voltage transformer sampling unit is eliminated,
So as to improve the security of system operation.
2nd, effectively limited by the electric current of the quick-break voltage transformer sampling unit measuring loop of fuse, it is to avoid electricity
Pressure transformer secondary winding is because electric current is excessive and reduces insulation and shortening life-span.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated：
Fig. 1 is the electrical block diagram of the secondary windings of PT short-circuit preventing device of the present invention；
Equivalent circuit diagrams of the Fig. 2 for secondary windings of PT short-circuit preventing device of the invention in A, B phase fault；
Equivalent circuit diagram when Fig. 3 is short-circuit for the A phases of the secondary windings of PT short-circuit preventing device of the present invention；
Fig. 4 is LED circuit circuit diagram in the secondary windings of PT short-circuit preventing device of the present invention.
In figure：QF- air switches, J- binding posts, the first major loops of R1- resistance, the second major loops of R2- resistance, R3-
Three major loop resistance, the protective resistances of r1- first, the protective resistances of r2- second, the protective resistances of r3- the 3rd, the protective resistances of r4- the 4th,
F1- first fuses, F2- second fuses, the fuses of F3- the 3rd, the light emitting diodes of L1- first, the light-emitting diodes of L2- second
Pipe, the light emitting diodes of L3- the 3rd.
Embodiment
The secondary windings of PT short-circuit preventing device that the present invention is provided, installed in secondary windings of PT and electricity
Between pressure transformer sampling unit measuring loop, for when voltage transformer sampling unit measuring loop is short-circuit, cutting off voltage
Circuit between transformer sampling unit measuring loop and secondary windings of PT, it is to avoid secondary windings of PT because
Super-high-current and scaling loss voltage transformer.
Epoxy resin board in voltage transformer terminal box, air switch, binding post and protection circuit plate point
It is not fixed on epoxy resin board
Secondary windings of PT short-circuit preventing device includes epoxy resin board, air switch, binding post and protection electricity
Road plate, air switch, binding post and protection circuit plate are each attached on epoxy resin board, and it is mutual that epoxy resin board is arranged on voltage
In sensor terminal box, because epoxy resin board is cheap, with excellent insulating properties and wear-resisting intensity, and it is easily designed
Install, therefore, the present invention is using sheet material of the epoxy resin board as fixed each electrical equipment position.
Protection circuit plate is connected between air switch and binding post, protection circuit plate specifically include major loop resistance,
Protective resistance, light emitting diode and fuse；Wherein, the live wire of secondary windings of PT is accessed in the end of incoming cables of air switch
With zero line, the leading-out terminal of air switch accesses one end of major loop resistance, the other end of major loop resistance and one end of fuse
Connection, the other end of fuse access the end of incoming cables of binding post while and protective resistance one end or light emitting diode
Positive pole is connected, the negative pole of the other end of protective resistance or light emitting diode accesses the end of incoming cables of binding post, and binding post goes out
Line end accesses the live wire and zero line of voltage transformer sampling unit measuring loop.
Fuse is used for when the electric current flowed through exceedes itself rated current, cut-out secondary windings of PT and voltage
Circuit between transformer sampling unit measuring loop.
Air switch is used for when changing the operation such as fuse, it is ensured that circuit no-voltage.
Light emitting diode is used for the working condition for showing fuse, when fuse is unblown, light emitting diode bright light, table
Show that short circuit does not occur for voltage transformer sampling unit measuring loop；When fuse blows, light emitting diode is turned off the light, and represents voltage
Short circuit occurs for transformer sampling unit measuring loop.
Major loop resistance is used to ensure that fuse can fuse rapidly.
Binding post is used for protection circuit, does not change original wiring of sampling voltage transformer sampling unit measuring loop.
Voltage transformer includes up to three secondary windings, and each secondary winding corresponds to a measuring loop, and voltage is mutual
The quantity of the measuring loop of sensor sampling unit is determined by the quantity of the secondary winding of voltage transformer.Secondary winding and measurement
Loop includes a live wire and a zero line respectively, below so that voltage transformer includes three secondary windings as an example, to the present invention
Secondary windings of PT short-circuit preventing device be described in detail, when voltage transformer include a secondary winding and two
During individual secondary winding, secondary windings of PT short-circuit preventing device can similarly be obtained.
Fig. 1 shows the circuit structure for the secondary windings of PT short-circuit preventing device that the present invention is provided.
As shown in figure 1, secondary windings of PT is respectively the first secondary winding, the second secondary winding and the three or two time
Winding, the live wire of the first secondary winding is referred to as A phases, and the live wire of the second secondary winding is referred to as B phases, and the live wire of the 3rd secondary winding claims
For C phases, the zero line of the first secondary winding, the second secondary winding and the 3rd secondary winding is referred to as N phases；Voltage transformer sampling is single
First measuring loop is respectively the first measuring loop, the second measuring loop and the 3rd measuring loop, and the live wire of the first measuring loop claims
For a phases, the live wire of the second measuring loop is referred to as b phases, and the live wire of the 3rd measuring loop is referred to as c phases, and the first measuring loop, second are surveyed
The zero line of amount loop and the 3rd measuring loop is referred to as n phases；Air switch is No. four air switches, the respectively first via, second
Road, the 3rd road and the 4th tunnel, the first secondary winding, the second secondary winding twist into one with the zero line N phases of the 3rd secondary winding and connect
Enter the 4th tunnel, live wire A phases, the live wire B phases of the second secondary winding of the first secondary winding are divided with the live wire C phases of the 3rd secondary winding
Jie Ru not the first via, the second road and the 3rd tunnel；Binding post is four hole binding posts, respectively the first hole, the second hole, the 3rd hole
With the 4th hole, the first measuring loop, the second measuring loop twist into one the 4th hole of access with the zero line n phases of the 3rd measuring loop,
Live wire a phases, the live wire b phases of the second measuring loop of first measuring loop are respectively connected to the live wire c phases of the 3rd measuring loop
One hole, the second hole and the 3rd hole.
Major loop resistance includes the first major loop resistance R1, the second major loop resistance R2 and the 3rd major loop resistance R3.
Protective resistance includes the first protective resistance r1, the second protective resistance r2, the protection electricity of the 3rd protective resistance r3 and the 4th
Hinder r4.
Fuse includes first fuse F1, second fuse F2 and the 3rd fuse F3；Light emitting diode includes first
Light emitting diode L1, the second light emitting diode L2 and the 3rd light emitting diode L3.
The live wire A phases of the first secondary winding are accessed in the end of incoming cables of the first via, and the leading-out terminal of the first via accesses the first major loop
Resistance R1 one end, the first major loop resistance R1 other end is connected with first fuse F1 one end, first fuse F1's
The other end accesses the end of incoming cables in the first hole and is connected with the first protective resistance r1 one end, the first protective resistance r1 other end
It is connected with the first light emitting diode L1 positive pole, the first light emitting diode L1 negative pole and the 4th protective resistance r4 one end connect
Connect, the 4th protective resistance r4 other end is connected with the end of incoming cables in the 4th hole, the leading-out terminal in the 4th hole accesses the first measuring loop
Zero line n, the live wire a of the first measuring loop accesses the leading-out terminal in the first hole.
The live wire B of the second secondary winding is accessed in the end of incoming cables on the second tunnel, and the leading-out terminal on the second tunnel accesses the second major loop electricity
R2 one end is hindered, the second major loop resistance R2 other end is connected with second fuse F2 one end, and second fuse F2's is another
One end access the second hole end of incoming cables and be connected with the second protective resistance r2 one end, the second protective resistance r2 other end and
Second light emitting diode L2 positive pole connection, the second light emitting diode L2 negative pole is connected with the 4th protective resistance r4 one end,
The 4th protective resistance r4 other end is connected with the end of incoming cables in the 4th hole, and the leading-out terminal in the 4th hole accesses the zero of the second measuring loop
Line n, the live wire b of the second measuring loop access the leading-out terminal in the second hole.
The live wire c of the 3rd secondary winding is accessed in the end of incoming cables on the 3rd tunnel, and the leading-out terminal on the 3rd tunnel accesses the 3rd major loop electricity
R3 one end is hindered, the 3rd major loop resistance R3 other end is connected with the 3rd fuse F3 one end, and the 3rd fuse F3's is another
One end access the 3rd hole end of incoming cables and be connected with the 3rd protective resistance r3 one end, the 3rd protective resistance r3 other end and
3rd light emitting diode L3 positive pole connection, the 3rd light emitting diode L3 negative pole is connected with the 4th protective resistance r4 one end,
The 4th protective resistance r4 other end is connected with the end of incoming cables in the 4th hole, and the leading-out terminal in the 4th hole accesses the zero of the 3rd measuring loop
Line n, the live wire c of the 3rd measuring loop access the leading-out terminal in the 3rd hole.
The end of incoming cables on the 4th tunnel is respectively connected to the zero line n of the first secondary winding, the second secondary winding and the 3rd secondary winding,
The leading-out terminal on the 4th tunnel is connected by wire with the end of incoming cables in the 4th hole.
Loop current is no more than 1mA during voltage transformer sampling unit measuring loop normal work, even lower, is similar to
Off state, the measuring loop are once occur phase fault or singlephase earth fault, and electric current will be sharply increased.In order to meet volume
First fuse F1, second fuse F2, the 3rd fuse F3 selection in the markets specification in small requirement as far as possible, the present invention are most
Small 5*20mm fuse pipes, i.e. rated current are 0.5A fuse.
When being less than its rated current by the electric current of fuse, fuse will not fuse, only more than its rated current
And when reaching blowout current, fuse can just generate heat fusing.Bigger by the electric current of fuse, fuse blows are faster.Typically
Regulation, when the electric current for flowing through fuse is 2 times of rated current, should fuse in 30 seconds；For 5 times of rated current when, answer wink
Between fuse.To ensure to occur during alternate or singlephase earth fault, fuse moment reliably fuses and avoids some as negative such as perception
The misoperation caused when starting is carried, present invention selection 2.5A electric currents are 5 times of rated current.
When phase fault occurs for measuring loop (such as A, B phase fault), its equivalent circuit diagram is as shown in Figure 2：
Known Uab=100V, I=2.5A, try to achieve R1=R2=0.5*Uab/I=20 Ω,
Wherein：Uab is the virtual value of the line voltage of secondary windings of PT；I is electric for the fusing of the fuse of setting
Flow valuve.
When singlephase earth fault occurs for measuring loop (such as A phases are grounded), its equivalent circuit diagram is as shown in Figure 3：
Known Ua=58V, I=2.5A, try to achieve R1=Ua/I=23.2 Ω,
Wherein：Ua is the virtual value of the phase voltage of secondary windings of PT；I is the blowout current of the fuse set
Value.
In summary two kinds of failure modes, choose 20 Ω resistors (two 10 Ω resistant series compositions) as major loop electricity
Resistance, i.e. the first major loop resistance R1, the second major loop resistance R2, the 3rd major loop resistance R3 resistance are 20 Ω.
To meet the requirement that LED operation electric current is 20mA, protective resistance r1, r2, r3, r4 selection such as Fig. 4 institutes
Show：
Known I1=I2=I3=20mA, Uan=58V, r1=r2=r3,
It can establish an equation：Uan=I1*r1+3*I1*r4,
2400 Ω resistance is selected as r1, r2, r3, choosing according to the specification of the existing resistor in market and equation constraints
120 Ω resistance is selected as r4.
Claims (4)
1. a kind of secondary windings of PT short-circuit preventing device, takes installed in secondary windings of PT with voltage transformer
Between sample unit measuring loop, it is characterized in that：Including air switch (QF), binding post (J) and protection circuit plate, the protection
Circuit board includes major loop resistance, protective resistance, light emitting diode and fuse；Wherein, the inlet wire of the air switch (QF)
The live wire and zero line into the secondary windings of PT are terminated, the leading-out terminal of the air switch (QF) accesses the master and returned
One end of road resistance, the other end of the major loop resistance is connected with one end of the fuse, the other end of the fuse
One end with the protective resistance or the positive pole of the light emitting diode while end of incoming cables of the binding post (J) is accessed
The negative pole of connection, the other end of the protective resistance or the light emitting diode accesses the end of incoming cables of the binding post (J), institute
The leading-out terminal for stating binding post (J) accesses the live wire and zero line of the voltage transformer sampling unit measuring loop.
2. secondary windings of PT short-circuit preventing device according to claim 1, it is characterized in that：
The voltage transformer includes the first secondary winding, the second secondary winding and the 3rd secondary winding, described the first two times around
Group includes live wire (A) and zero line (N), and second secondary winding includes live wire (B) and zero line (N), the 3rd secondary winding
Including live wire (C) and zero line (N)；
The voltage transformer sampling unit measuring loop includes the first measuring loop, the second measuring loop and the 3rd and measured back
Road, first measuring loop includes live wire (a) and zero line (n), and second measuring loop includes live wire (b) and zero line (n),
3rd measuring loop includes live wire (c) and zero line (n)；
The air switch (QF) includes the first via, the second tunnel, the 3rd road and the 4th tunnel；
The binding post (J) includes the first hole, the second hole, the 3rd hole and the 4th hole；
The major loop resistance includes the first major loop resistance (R1), the second major loop resistance (R2) and the 3rd major loop resistance
(R3)；
The protective resistance includes the first protective resistance (r1), the second protective resistance (r2), the 3rd protective resistance (r3) and the 4th
Protective resistance (r4)；
The fuse includes first fuse (F1), second fuse (F2) and the 3rd fuse (F3)；
The light emitting diode includes the first light emitting diode (L1), the second light emitting diode (L2) and the 3rd light emitting diode
(L3)；And,
The live wire (A) of first secondary winding, the leading-out terminal access institute of the first via are accessed in the end of incoming cables of the first via
State one end of the first major loop resistance (R1), the other end and the first fuse (F1) of the first major loop resistance (R1)
One end connection, the other end of the first fuse (F1) access first hole end of incoming cables and with the described first protection
One end connection of resistance (r1), the other end of first protective resistance (r1) and the positive pole of first light emitting diode (L1)
Connection, the negative pole of first light emitting diode (L1) is connected with one end of the 4th protective resistance (r4), and the described 4th protects
The other end of shield resistance (r4) is connected with the end of incoming cables in the 4th hole, leading-out terminal access first measurement in the 4th hole
The zero line (n) in loop, the live wire (a) of first measuring loop accesses the leading-out terminal in first hole；
The live wire (B) of second secondary winding, the leading-out terminal access institute on second tunnel are accessed in the end of incoming cables on second tunnel
State one end of the second major loop resistance (R2), the other end and the second fuse (F2) of the second major loop resistance (R2)
One end connection, the other end of the second fuse (F2) access second hole end of incoming cables and with the described second protection
One end connection of resistance (r2), the other end of second protective resistance (r2) and the positive pole of second light emitting diode (L2)
Connection, the negative pole of second light emitting diode (L2) is connected with one end of the 4th protective resistance (r4), and the described 4th protects
The other end of shield resistance (r4) is connected with the end of incoming cables in the 4th hole, leading-out terminal access second measurement in the 4th hole
The zero line (n) in loop, the live wire (b) of second measuring loop accesses the leading-out terminal in second hole；
The live wire (C) of the 3rd secondary winding, the leading-out terminal access institute on the 3rd tunnel are accessed in the end of incoming cables on the 3rd tunnel
State one end of the 3rd major loop resistance (R3), the other end and the 3rd fuse (F3) of the 3rd major loop resistance (R3)
One end connection, the other end of the 3rd fuse (F3) access the 3rd hole end of incoming cables and with the described 3rd protection
One end connection of resistance (r3), the other end of the 3rd protective resistance (r3) and the positive pole of the 3rd light emitting diode (L3)
Connection, the negative pole of the 3rd light emitting diode (L3) is connected with one end of the 4th protective resistance (r4), and the described 4th protects
The other end of shield resistance (r4) is connected with the end of incoming cables in the 4th hole, leading-out terminal access the 3rd measurement in the 4th hole
The zero line (n) in loop, the live wire (c) of the 3rd measuring loop accesses the leading-out terminal in the 3rd hole；
The end of incoming cables on the 4th tunnel is respectively connected to first secondary winding, second secondary winding and described three or two time
The zero line (N) of winding, the leading-out terminal on the 4th tunnel is connected by wire with the end of incoming cables in the 4th hole.
3. secondary windings of PT short-circuit preventing device according to claim 2, it is characterized in that：
The first fuse (F1), the second fuse (F2) and the rated current of the 3rd fuse (F3) are
0.5A；
The first major loop resistance (R1), the resistance of the second major loop resistance (R2) and the 3rd major loop resistance (R3)
Value is 20 Ω；
First protective resistance (r1), second protective resistance (r2) and the resistance of the 3rd protective resistance (r3) are
2400 Ω, the resistance of the 4th protective resistance (r4) is 120 Ω；
First light emitting diode (L1), second light emitting diode (L2) and the work of the 3rd light emitting diode (L3)
Make electric current for 20mA.
4. secondary windings of PT short-circuit preventing device according to claim 1, it is characterized in that：Also include being arranged on electricity
Press the epoxy resin board in transformer terminal box, the air switch (QF), the binding post (J) and the protection circuit plate
It is separately fixed on the epoxy resin board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710432223.9A CN107132463B (en) | 2017-06-09 | 2017-06-09 | Short circuit preventing device for secondary winding of voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710432223.9A CN107132463B (en) | 2017-06-09 | 2017-06-09 | Short circuit preventing device for secondary winding of voltage transformer |
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| CN107132463A true CN107132463A (en) | 2017-09-05 |
| CN107132463B CN107132463B (en) | 2023-06-23 |
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| CN201710432223.9A Active CN107132463B (en) | 2017-06-09 | 2017-06-09 | Short circuit preventing device for secondary winding of voltage transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107358A (en) * | 2018-01-25 | 2018-06-01 | 国网江苏省电力有限公司徐州供电分公司 | Portable voltage mutual inductor auxiliary air closing detecting apparatus and method of discrimination |
| CN108429242A (en) * | 2018-03-31 | 2018-08-21 | 苏州风中智能科技有限公司 | A kind of protector of electronic component |
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| RU2214663C1 (en) * | 2002-04-17 | 2003-10-20 | Пухов Игорь Константинович | Short-circuit protective gear |
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| CN203126544U (en) * | 2013-01-10 | 2013-08-14 | 浙江吉利汽车研究院有限公司杭州分公司 | Block terminal with blown fuse detection function |
| CN203179688U (en) * | 2013-01-30 | 2013-09-04 | 江苏博斯特科技电力有限公司 | Intelligent voltage transformer |
| CN203305936U (en) * | 2013-06-18 | 2013-11-27 | 苏州力特奥维斯保险丝有限公司 | Relay control unit |
-
2017
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| JPH08251806A (en) * | 1995-03-13 | 1996-09-27 | Matsushita Electric Ind Co Ltd | Protective circuit in the case of short circuit |
| RU2214663C1 (en) * | 2002-04-17 | 2003-10-20 | Пухов Игорь Константинович | Short-circuit protective gear |
| CN102680766A (en) * | 2012-05-07 | 2012-09-19 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit for control and protection switches |
| CN203126544U (en) * | 2013-01-10 | 2013-08-14 | 浙江吉利汽车研究院有限公司杭州分公司 | Block terminal with blown fuse detection function |
| CN203179688U (en) * | 2013-01-30 | 2013-09-04 | 江苏博斯特科技电力有限公司 | Intelligent voltage transformer |
| CN203305936U (en) * | 2013-06-18 | 2013-11-27 | 苏州力特奥维斯保险丝有限公司 | Relay control unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108107358A (en) * | 2018-01-25 | 2018-06-01 | 国网江苏省电力有限公司徐州供电分公司 | Portable voltage mutual inductor auxiliary air closing detecting apparatus and method of discrimination |
| CN108429242A (en) * | 2018-03-31 | 2018-08-21 | 苏州风中智能科技有限公司 | A kind of protector of electronic component |
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| Publication number | Publication date |
|---|---|
| CN107132463B (en) | 2023-06-23 |
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