CN209356592U - Power frequency immunity to interference tester for Electric Power Automation Equipment - Google Patents
Power frequency immunity to interference tester for Electric Power Automation Equipment Download PDFInfo
- Publication number
- CN209356592U CN209356592U CN201821769706.4U CN201821769706U CN209356592U CN 209356592 U CN209356592 U CN 209356592U CN 201821769706 U CN201821769706 U CN 201821769706U CN 209356592 U CN209356592 U CN 209356592U
- Authority
- CN
- China
- Prior art keywords
- pin
- optocoupler
- cpu
- relay
- connection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model discloses the power frequency immunity to interference testers for Electric Power Automation Equipment, it include: isolating transformer (3), isolating transformer (3) is connect by selection switch (4) with voltage transformer (5), one end of voltage transformer (5) and coupling network (12) connection, the other end passes through switch (6) and coupling network (12) connection, voltage transformer is also connect with zero cross detection circuit (7), zero cross detection circuit (7) and CPU(9) connection, CPU(9 it) is connect by control circuit (8) with the relay for control switch (6), the utility model has structure simple, system is reliable, the advantages that cost performance is high, and it can satisfy the test request of power frequency immunity to interference test of the power industry to protective relaying device.
Description
Technical field
The utility model belongs to electric system shield technical field, more particularly, to the power frequency anti-interference of Electric Power Automation Equipment
Spend tester.
Background technique
With the continuous development of smart grid, protective relaying device is also all the more intelligent, and protective relaying device is power train
System reliability service provides technical support.Protective relaying device is quickly found by information such as acquisition intake, voltage and currents
Protection breaker tripping and closing function is realized in fault point, can normal breaker tripping and closing be related to the safety of network system.Protective relaying device work
In substation, it is opened into being easy interference by power frequency, and relay protection is opened into being exactly a part being wherein disturbed,
If protective relaying device is opened into being disturbed and accidentally exported, the malfunction of relay protection is easily caused, so open entry loop is wanted
With corresponding anti-interference ability.
The instrument that the test of power frequency immunity to interference is carried out to relay protection intake is not implemented separately currently on the market, usually all
It is integrated in other equipment, volume is big, and structure is complicated, and cost is high.
Utility model content
The utility model mainly solves technical problem present in the prior art, provides for Electric Power Automation Equipment
Power frequency immunity to interference tester, structure is simple, and system is reliable, and cost performance is high, can satisfy power industry to protective relaying device
The test request of power frequency immunity to interference test.
Above technical problems of the utility model are mainly solved by the following technical scheme:
A kind of power frequency immunity to interference tester for Electric Power Automation Equipment, isolating transformer, isolating transformer pass through choosing
It selects switch to connect with voltage transformer, one end of voltage transformer is connected with coupling network, and the other end passes through switch and catenet
Network connection, voltage transformer also connect with zero cross detection circuit, and zero cross detection circuit is connect with CPU, CPU pass through control circuit and
Relay for control switch connects.
After 220V alternating current is by air switch and fuse, voltage needed for exporting power frequency immunity to interference through isolating transformer,
Switching the interference that selection is implemented by selection is DM EMI or common mode interference.Voltage transformer acquires alternating voltage, and leads to
After zero cross detection circuit determines that zero-crossing of alternating current, CPU determine zero crossing, the corresponding time of being delayed (half of cycle time 10mS- after
Electric appliance actuation time t1) the control actuating of relay is carried out by control circuit afterwards, so that relay normally open contact (switch) be made to exist
Alternating voltage zero-crossing point is closed, and then is applied to power-frequency voltage on coupling network, and to the open entry loop of tested device
Carry out the test of power frequency immunity to interference.
Wherein, the secondary of isolating transformer is two identical winding compositions, switchs selection isolating transformer by selection
Secondary be one group of winding carry out work or two windings work at the same time.When needing to carry out common mode interference, selection switch is beaten
When to location A, two windings of the secondary of isolating transformer are worked at the same time at this time, and the operating mode of entire tester is dry for common mode
It disturbs, output AC voltage 300V；When selection switch gets to B location, isolating transformer only has first group of winding to work, and second
Group winding is unloaded, and the operating mode of entire tester is DM EMI, output AC voltage 150V.
The zero cross detection circuit includes comparing transport and placing device U1A and optocoupler U2, and the pin 2 for comparing transport and placing device U1A is amplifier
Input negative terminal, Uin are the collected voltage of voltage transformer；The pin 3 of transport and placing device is that amplifier inputs anode, passes through electric resistance partial pressure
So that the input voltage for comparing transport and placing device U1A pin 3 is essentially zero volt；The pin 1 for comparing transport and placing device U1A is output end, when defeated
Enter pin 2 voltage be greater than input pin 3 voltage when, compare transport and placing device U1A output be low level, when the electricity of input pin 2
When pressure is less than the voltage of input pin 3, comparing transport and placing device U1A output is high level, since the voltage of input pin 3 is positive zero
Width, so the output for comparing transport and placing device U1A just becomes high level from low level when inputting the voltage of Uin from positive to negative.For
The conducting electric current for improving optocoupler compares transport and placing device U1A output end and adds pull-up resistor R5 a to VCC1, when transport and placing device output is high electric
Usually, optocoupler U2 is connected, so that the output end Uout of optocoupler U2 is low-voltage；When U2 exports low level, optocoupler U2 shutdown makes
It obtains Uout and exports high level.Uout is connected to CPUIO interface, when Uout output becomes low-voltage by high level, illustrates Uin voltage
Through zero passage voltage point.
The pin 1 of optocoupler D1 is connected to VCC1 by resistance R8 in the control circuit, and the pin 2 of optocoupler D1 is connected to CPU's
The pin 3 of the I/O port of I/O module, optocoupler D1 is connected on VCC3, and the pin 4 of optocoupler D1 is connected on the pin 1 of relay K1, relay
The pin 16 of device K1 is connected on the ground, and the pin 1 and pin 16 of relay K1 are the actuation coil of relay K1, the pipe of relay K1
Relay normally open contact (control switch) in foot 5 and the corresponding main circuit of pin 8.When needing closing relay normal opened contact
It waiting, the IO_DRV of CPU exports low level, so that optocoupler D1 primary side acts, so that the primary side of optocoupler D1 is connected, thus
So that VCC3 voltage is applied to relay K1 actuation coil both ends, so that relay K1 is acted, so that entire coupling
Network electrification.The pin 1 of optocoupler D2 is connected to VCC1 by resistance R9, and the pin 2 of optocoupler D2 is connected to the I/O module of system control cpu
I/O port, the pin 3 of optocoupler D2 is connected on VCC3, and the pin 4 of optocoupler D2 is connected on the pin 2 of relay K1, relay K1's
Pin 15 is connected on the ground, and the pin 2 and pin 15 of relay K1 are the involution coil of relay K1, when needing to stop tester
When, the IO_REST of system control cpu exports low level, so that optocoupler D2 primary side acts, so that the primary side of optocoupler D2
Conducting, so that VCC3 voltage is applied to relay K1 involution coil both ends, so that relay K1 involution, so that
Entire coupling network no longer charges.
The coupling network is divided into differential mode coupling network and two kinds of common mode coupling network.Differential mode coupling network firewire and zero curve
Circuit connect respectively 100 Ω resistance and 0.1uF capacitor.When carrying out DM EMI test, one end of power-frequency voltage input terminal
Start to exchange fire line, another terminal connecting zero line, by accessing the opening into just and opening into negative of tested device after differential mode coupling network, and ground wire with
The casing of tested device it is connected.The circuit of common mode coupling network firewire and zero curve connect respectively 220 Ω resistance and 0.47uF electricity
Hold, the power-frequency voltage input terminal of firewire and zero curve is shorted, and need to access the firewire of tested device and zero curve separately access open into
Just and open into negative.When carrying out common mode interference test, one end of power-frequency voltage input terminal is started to exchange fire line and zero curve, other end ground connection
Line, after common mode coupling network, the output termination tested device of firewire is opened into just, and the output of zero curve terminates tested device
Open into negative, ground wire is connected with the casing of tested device.
The beneficial effects of the utility model are: the utility model has structure simple, system is reliable, and cost performance height etc. is excellent
Point, and can satisfy the test request of power frequency immunity to interference test of the power industry to protective relaying device.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic block diagram of the utility model；
Fig. 2 is the schematic illustration of zero cross detection circuit in the utility model；
Fig. 3 is the schematic illustration of control circuit in the utility model；
Fig. 4 is the schematic illustration of coupling network in the utility model.
Specific embodiment
The preferred embodiment of the utility model is described in detail with reference to the accompanying drawing, so that the advantages of the utility model
It can be easier to be readily appreciated by one skilled in the art with feature, to make the protection scope of the utility model apparent clear
Define
A kind of power frequency immunity to interference tester for Electric Power Automation Equipment, comprising: isolating transformer 3, isolating transformer 3
It is connect by selection switch 4 with voltage transformer 5, one end of voltage transformer 5 and coupling network 12 connect, and the other end is by opening
6 and the connection of coupling network 12 are closed, voltage transformer is also connect with zero cross detection circuit 7, and zero cross detection circuit 7 is connect with CPU9,
CPU9 is connect by control circuit 8 with the relay for control switch 6.
As shown in Figure 1,220V alternating current is connect by the primary after air switch 1 and fuse 2 with isolating transformer 3,
The secondary output of isolating transformer 3 is two identical winding compositions.It is connect, is elected to voltage transformer 5 by selection switch 4
It selects switch 4 and gets to location A, two windings in series of isolating transformer secondary export 300V alternating current, entire tester system work
Make under common mode interference；When selection switch gets to B location, two windings of 3 grades of isolating transformer only have first winding work
Make, output voltage 150V alternating current, entire tester system work is under DM EMI.Voltage transformer 5 acquires output voltage,
And zero passage detection is carried out, and so as to relay normally open contact 6(switch 6) it controls.Zero cross detection circuit 7 in control circuit 8
Zero passage detection is carried out to the voltage that voltage transformer 5 acquires, zero cross detection circuit 7 exports low and high level, when there is level change
Point is the zero crossing of alternating current, and the I/O port of the I/O module of CPU carries out zero crossing judgement according to collected low and high level, due to
There are several milliseconds of delay times for the actuating of relay, and the period of alternating current is 20ms, half period 10ms, so relay
The actuation time of device must be taken into consideration, and system control cpu, which is delayed and leads to control circuit 8, carries out movement and involution processing to relay.
Coupling network 12 selects coupling network according to actual test project, carries out differential mode or common mode interference degree to tested device
Test.Host computer is connected by the communication module of ethernet circuit and CPU, start to entire tester system and is stopped grasping
Make.
As shown in Fig. 2, zero cross detection circuit 7 uses the principle of resistance R1, R2 and R3 electric resistance partial pressure, the voltage on R3 is approximate
For 0V, to be linked into, to compare the voltage of the pin 3 of transport and placing device U1A be approximately 0V, defeated when the pin 2 for comparing transport and placing device U1A
When entering voltage and becoming negative voltage from positive voltage, compares transport and placing device output voltage from low level and become high level.When comparing transport and placing device
Low level is exported, optocoupler U2 primary is not turned on, so that optocoupler secondary is not turned on, so that output Uout is high level；It is transported when comparing
Device output high level, the conducting of optocoupler U2 primary are put, so that being connected from optocoupler secondary, so that output Uout is low level.When CPU's
I/O port detects that low level to when high level variation, illustrates that alternating voltage becomes negative alternating current from positive alternating current.
As shown in figure 3, relay K1 is that movement guard relay needs after relay tip 6 is closed in control circuit 8
The back contact of involution is wanted just to disconnect.After CPU determines zero crossing, (T=10ms-t1, t1 are actuating of relay delay to delay T time
Time), the pin IO_DRV of CPU exports low level, acts optocoupler D1 primary, thus D1 grade movement of optocoupler, optocoupler D1 times
After grade movement actuation coil (the pin 1 and pin 16) electrification of relay K1 is acted, then relay is normal in main circuit
Open the movement of contact 6, entire tester system electrification.When needing to stop tester system, host computer clicks stop button, and leads to
The pin IO_REST output low level of CPU is crossed, so that the involution coil of relay K1 obtains electric, then relay normally open contact is disconnected
It opens, entire tester system stops working.
As shown in figure 4, coupling network 12 divides for differential mode coupling network and common mode coupling network.The fire of differential mode coupling network 12
Line and zero curve pass through respectively 100 Ω resistance (R11, R 12) and 0.1uF capacitor (C11, C12) access tested device open into just and
It opens into negative, the firewire of a termination coupling network of power frequency ac voltage, the zero curve of another termination coupling network, the ground of coupling network
Line is with connecing the casing of tested device 13.The firewire and zero curve of common mode coupling network pass through respectively 220 Ω resistance (R13, R14) and
0.47uF capacitor (C13, C14) access tested device 13 is opened into just and opening into negative, and the ground wire of coupling network connects tested device
Casing.Power frequency ac voltage over the ground one termination coupling network firewire and zero curve, power frequency ac voltage another termination coupling
The ground wire of network.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, any change or replacement expected without creative work be should be covered within the scope of the utility model.
Therefore, the protection scope of the utility model should be determined by the scope of protection defined in the claims.
Claims (6)
1. a kind of power frequency immunity to interference tester for Electric Power Automation Equipment characterized by comprising isolating transformer (3),
Isolating transformer (3) is connect by selection switch (4) with voltage transformer (5), one end of voltage transformer (5) and coupling network
(12) it connects, the other end is also connected with zero cross detection circuit (7) by switch (6) and coupling network (12) connection, voltage transformer
Connect, zero cross detection circuit (7) and CPU(9) connection, CPU(9) pass through control circuit (8) and the relay for being used for control switch (6)
Connection.
2. a kind of power frequency immunity to interference tester for Electric Power Automation Equipment according to claim 1, it is characterised in that:
The secondary of the isolating transformer (3) is made of two identical windings, passes through selection switch (4) selection isolating transformer (3)
It is to be worked at the same time by one group of winding work or two groups of windings.
3. a kind of power frequency immunity to interference tester for Electric Power Automation Equipment according to claim 1, it is characterised in that:
The zero cross detection circuit includes comparing transport and placing device U1A and optocoupler U2, and pin 2 and the voltage for comparing transport and placing device U1A input terminal are mutual
Sensor (5) connection, output end pin 1 and resistance R 6 series connection after be connected with the input terminal of optocoupler U2, the output end of optocoupler U2 and
CPU(9 I/O interface) is connected.
4. a kind of power frequency immunity to interference tester for Electric Power Automation Equipment according to claim 1, it is characterised in that:
Including optocoupler D1 and optocoupler D2, the pin 2 and CPU(9 of optocoupler D1 input terminal) I/O port connection, the pin 4 and relay of output end
The pin 1 of device K1 connects；The pin 2 and CPU(9 of optocoupler D2 input terminal) I/O port connection, the pin 4 of output end and relay K1
Pin 2 connect；Both ends of the pin 5 and pin 8 of relay K1 to inductive switch (6).
5. a kind of power frequency immunity to interference tester for Electric Power Automation Equipment according to claim 1, it is characterised in that:
The coupling network includes differential mode coupling network and common mode coupling network.
6. a kind of power frequency immunity to interference tester for Electric Power Automation Equipment according to claim 1, it is characterised in that:
Further include host computer, host computer passes through Ethernet and CPU(9) connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821769706.4U CN209356592U (en) | 2018-10-30 | 2018-10-30 | Power frequency immunity to interference tester for Electric Power Automation Equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821769706.4U CN209356592U (en) | 2018-10-30 | 2018-10-30 | Power frequency immunity to interference tester for Electric Power Automation Equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209356592U true CN209356592U (en) | 2019-09-06 |
Family
ID=67782246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821769706.4U Active CN209356592U (en) | 2018-10-30 | 2018-10-30 | Power frequency immunity to interference tester for Electric Power Automation Equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209356592U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655743A (en) * | 2021-08-17 | 2021-11-16 | 北京计算机技术及应用研究所 | Power supply selection control circuit for automatic fault detection and repair |
| CN116930851A (en) * | 2023-06-26 | 2023-10-24 | 南京国电南自电网自动化有限公司 | System and method for detecting interference immunity of power frequency magnetic field of relay protection device |
-
2018
- 2018-10-30 CN CN201821769706.4U patent/CN209356592U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655743A (en) * | 2021-08-17 | 2021-11-16 | 北京计算机技术及应用研究所 | Power supply selection control circuit for automatic fault detection and repair |
| CN113655743B (en) * | 2021-08-17 | 2023-03-10 | 北京计算机技术及应用研究所 | Power supply selection control circuit for automatic fault detection and repair |
| CN116930851A (en) * | 2023-06-26 | 2023-10-24 | 南京国电南自电网自动化有限公司 | System and method for detecting interference immunity of power frequency magnetic field of relay protection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104377816B (en) | A kind of control method of intelligentized reclosing breaker and its automatic reclosing | |
| CN111694288B (en) | On-site feeder automation function closed-loop automatic test platform | |
| CN201540362U (en) | DC power parameter automatic testing device | |
| CN201724988U (en) | Input phase failure detector for power unit of high-voltage frequency converter | |
| CN106199341A (en) | Faulty line recognition methods under a kind of single-phase fault ground connection operating mode and device | |
| CN110045182A (en) | A kind of low-voltage platform area current supply circuit exception analysis method based on impedance computation | |
| CN209356592U (en) | Power frequency immunity to interference tester for Electric Power Automation Equipment | |
| CN109494696A (en) | Power distribution network asymmetry fault section and isolation method and system based on adaptive reclosing | |
| CN203398761U (en) | Integrated protector of motor | |
| CN203788045U (en) | Intelligent interface device for primary equipment in transformer station | |
| CN102508155A (en) | Test circuit for internally installed load switch of intelligent electric energy meter | |
| CN108181500B (en) | Method for determining non-pressure fixed value of switching-on of power transmission and transformation equipment | |
| CN103675554A (en) | Standby power source automatic switching device tester | |
| CN109672153A (en) | AC/DC interconnected system based on abc- α β variation exchanges differential protecting method | |
| CN202585083U (en) | Instrument transformer and iron resonance suppression circuit | |
| CN205229347U (en) | Haul oneself willingly into tester fully | |
| CN114441896B (en) | Distribution network automatic simulation platform and FTU detection method | |
| CN101777747A (en) | Power grid state detection method of leakage protector with light coupling isolation | |
| CN204538706U (en) | Low-voltage intelligent synchro switch | |
| CN207352129U (en) | A kind of current zero-crossing point closing device of low-voltage circuit breaker characteristic test | |
| CN207652015U (en) | A kind of intelligent power | |
| CN206619551U (en) | Extend the circuit of relay life under a kind of AC network | |
| CN102185294B (en) | Wire microcomputer protection device based inrush discrimination technology | |
| CN104836239A (en) | Low-voltage intelligent synchronous switch | |
| Ko et al. | The FRTU-based fault-zone isolation method in the distribution systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |