CN205844392U - A kind of load ratio bridging switch electric current on-line measurement unit - Google Patents
A kind of load ratio bridging switch electric current on-line measurement unit Download PDFInfo
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- CN205844392U CN205844392U CN201620741553.7U CN201620741553U CN205844392U CN 205844392 U CN205844392 U CN 205844392U CN 201620741553 U CN201620741553 U CN 201620741553U CN 205844392 U CN205844392 U CN 205844392U
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Abstract
The utility model discloses a kind of load ratio bridging switch electric current on-line measurement unit, including current transformer module, from signal processing circuit module, power module, signal processing control module and DTU module, current transformer module output two-way current signal to its correspondence from signal processing circuit module, one tunnel is current sampling signal, and another road provides the working power from signal processing circuit module；From signal processing circuit module, current sampling signal is carried out conversion process, and transformation result is stored in caching；Transformation result is passed through optical fiber transmitting terminal Serial output to signal processing control module simultaneously；Power module is connected with signal processing control module；Signal processing control module is connected with from signal processing circuit module by optical fiber interface, and be connected with DTU module, to process through the data of optical fiber transmitting terminal Serial output from signal processing circuit module, signal processing control module sends the current waveform data every time switched to DTU module；The Wave data of reception is sent in GPRS network by antenna by DTU module by communication interface.
Description
Technical field
This utility model relates to field of measuring technique, especially relates to a kind of load ratio bridging switch electric current on-line measurement list
Unit.
Background technology
Load ratio bridging switch is a kind of switching device providing constant voltage for transformator when load change.It is the most former
Reason is exactly ensureing not in the case of interrupt load electric current, it is achieved switching between tap in Transformer Winding, thus changes
The voltage ratio of the number of turn of winding, i.e. transformator, finally realizes the purpose of pressure regulation.
In current power transmission and transformation industry, high-power transformer be mounted with the most widely on-load voltage regulating switch with guarantee system and
The quality of voltage of user.And load ratio bridging switch is the critical component in transformator, switching therein switch carries load electricity
The switch transition process of stream, thus it is considered the heart of load ratio bridging switch, its reliability has decisive role.Online prison
Surveying switching switch switch transition process, directly measure electric current and obtain switching waveform, this is most straightforward approach, and can reflect ought
Front loaded switch operation conditions, can pinpoint the problems in advance according to current switching waveform, thus take appropriate measures.
The method of on-line monitoring loaded switch has multiple, such as mechanical performance on-line monitoring, loaded switch acoustic fingerprints at present
On-the-spot tests etc., these are all indirectly to reflect operation conditions, and most important deficiency is to there is the i.e. scene interference of the biggest discreteness
Factor is a lot, and needs substantial amounts of data to form data base and screen.
It is most straightforward approach that switch switch transition process measurement electric current obtains switching waveform, by selecting current transformer
?.But measure the electric current of primary side, it is necessary to select corresponding pressure grade.The voltage 10KV's that loaded switch is minimum, with
Supporting current transformer volume big, heavy, for the whole process of monitoring switch switch transition, at least to have 6, it is clear that
There is no operability the most at all.And select small and exquisite current transformer, solve primary side high pressure again low with secondary
The isolating problem of pressure, this is the technological difficulties measured.
Up-to-date have kind of a load ratio bridging switch electric current on-line monitoring integral system, it is possible to online acquisition current switching waveform,
Monitoring loaded switch runs.Although this monitoring system is fine, but there is great hidden danger, transformator will be directly influenced
Safe operation.It has respectively put a current transformer on switching switch U1 and U2, V1 and V2, W1 and W2, amounts to 6.For
Obtain the current waveform before and after switching, before and after switching, on sampling apparatus, must have a working power, connect 2 for this it with wire
The method of individual sampling apparatus provides mutually power supply, even if the most easily cause U1 and U2 (V1 and V2, W1 and W2) with high-voltage conducting wires
Between short circuit.Enough safe distances had been had between original U1 and U2 (V1 and V2, W1 and W2), the most artificial this distance
It is greatly shortened owing to sampling apparatus wire connects.
Utility model content
The purpose of this utility model is for the problems referred to above, it is provided that a kind of reasonable in design, simple in construction, it is possible to effectively record
A kind of load ratio bridging switch electric current on-line measurement unit of loaded switch switching current waveform.
In order to reach above-mentioned utility model purpose, solve the technical scheme that its technical problem used as follows:
A kind of load ratio bridging switch electric current on-line measurement unit, including multiple current transformer module, multiple at signal
Reason circuit module, a power module, a signal processing control module and a DTU module, wherein:
The quantity of described current transformer module is identical with the described quantity from signal processing circuit module；
Each described current transformer module output two-way current signal to described in its correspondence from signal processing circuit mould
Block, a road current signal is current sampling signal, and another road current signal is to provide described from the work of signal processing circuit module
Make power supply；
From signal processing circuit module on the one hand to the electric current transmitted from described current transformer module described in each
Sampled signal carries out conversion process, and transformation result is stored in caching；On the other hand, described from signal processing circuit module
Transformation result is passed through optical fiber transmitting terminal Serial output to described signal processing control module by microprocessor；
Described power module is connected with described signal processing control module, it is provided that the work of described signal processing control module
Power supply；
Described signal processing control module is connected from signal processing circuit module with described by optical fiber interface, while the most again with
Described DTU module connects, and processes described through the data of optical fiber transmitting terminal Serial output from signal processing circuit module, and
Send the current waveform data every time switched to described DTU module；
The current waveform data of reception is sent in GPRS network by antenna by described DTU module by communication interface.
As a specific embodiment,
Multiple described current transformer module include 9 separate current transformers altogether, and the respectively first electric current is mutual
Sensor, the second current transformer, the 3rd current transformer, the 4th current transformer, the 5th current transformer, the 6th Current Mutual Inductance
Device, the 7th current transformer, the 8th current transformer and the 9th current transformer；
Multiple described from signal processing circuit module include altogether 9 separate from signal processing circuit, respectively the
One from signal processing circuit, second from signal processing circuit, the 3rd from signal processing circuit, the 4th from signal processing circuit,
Five from signal processing circuit, the 6th from signal processing circuit, the 7th from signal processing circuit, the 8th from signal processing circuit and
Nine from signal processing circuit；
9 described current transformer module export 9 Zu Gong 18 road current signals, respectively Ia1 and Ia2, Ib1 and Ib2,
Ic1 and Ic2, Id1 and Id2, Ie1 and Ie2, If1 and If2, Ig1 and Ig2, Ih1 and Ih2, Ii1 and Ii2；
Described first current transformer in order to:
To described first from signal processing circuit input current signal Ia1 and Ia2, and simultaneously to described first at signal
Reason circuit provides working power；
Described second current transformer in order to:
To described second from signal processing circuit input current signal Ib1 and Ib2, and simultaneously to described second at signal
Reason circuit provides working power；
Described 3rd current transformer in order to:
To the described 3rd from signal processing circuit input current signal Ic1 and Ic2, and simultaneously to the described 3rd at signal
Reason circuit provides working power；
Described 4th current transformer in order to:
To the described 4th from signal processing circuit input current signal Id1 and Id2, and simultaneously to the described 4th at signal
Reason circuit provides working power；
Described 5th current transformer in order to:
To the described 5th from signal processing circuit input current signal Ie1 and Ie2, and simultaneously to the described 5th at signal
Reason circuit provides working power；
Described 6th current transformer in order to:
To the described 6th from signal processing circuit input current signal If1 and If2, and simultaneously to the described 6th at signal
Reason circuit provides working power；
Described 7th current transformer in order to:
To the described 7th from signal processing circuit input current signal Ig1 and Ig2, and simultaneously to the described 7th at signal
Reason circuit provides working power；
Described 8th current transformer in order to:
To the described 8th from signal processing circuit input current signal Ih1 and Ih2, and simultaneously to the described 8th at signal
Reason circuit provides working power；
Described 9th current transformer in order to:
To the described 9th from signal processing circuit input current signal Ii1 and Ii2, and simultaneously to the described 9th at signal
Reason circuit provides working power.
As a specific embodiment,
Described signal processing circuit module is provided with 9 optical fiber transmitting terminals, in order to send 9 groups of fiber-optic signals, described in 9
Optical fiber transmitting terminal be respectively the first optical fiber transmitting terminal, the second optical fiber transmitting terminal, the 3rd optical fiber transmitting terminal, the 4th optical fiber transmitting terminal,
5th optical fiber transmitting terminal, six fibers transmitting terminal, the 7th optical fiber transmitting terminal, the 8th optical fiber transmitting terminal and the 9th optical fiber transmitting terminal；
Described first from signal processing circuit in order to:
On the one hand current signal Ia1 is processed by rectification, to provide the described first work electricity from signal processing circuit
Source, and the current sampling signal Ia2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described first microprocessor from signal processing circuit by the first optical fiber
End Serial output is to described signal processing control module；
Described second from signal processing circuit in order to:
On the one hand current signal Ib1 is processed by rectification, to provide the described second work electricity from signal processing circuit
Source, and the current sampling signal Ib2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described second microprocessor from signal processing circuit by the second optical fiber
End Serial output is to described signal processing control module；
Described 3rd from signal processing circuit in order to:
On the one hand current signal Ic1 is processed by rectification, to provide the described 3rd work electricity from signal processing circuit
Source, and the current sampling signal Ic2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 3rd microprocessor from signal processing circuit by the 3rd optical fiber
End Serial output is to described signal processing control module；
Described 4th from signal processing circuit in order to:
On the one hand current signal Id1 is processed by rectification, to provide the described 4th work electricity from signal processing circuit
Source, and the current sampling signal Id2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 4th microprocessor from signal processing circuit by the 4th optical fiber
End Serial output is to described signal processing control module；
Described 5th from signal processing circuit in order to:
On the one hand current signal Ie1 is processed by rectification, to provide the described 5th work electricity from signal processing circuit
Source, and the current sampling signal Ie2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 5th microprocessor from signal processing circuit by the 5th optical fiber
End Serial output is to described signal processing control module；
Described 6th from signal processing circuit in order to:
On the one hand current signal If1 is processed by rectification, to provide the described 6th work electricity from signal processing circuit
Source, and the current sampling signal If2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 6th microprocessor from signal processing circuit by six fibers
End Serial output is to described signal processing control module；
Described 7th from signal processing circuit in order to:
On the one hand current signal Ig1 is processed by rectification, to provide the described 7th work electricity from signal processing circuit
Source, and the current sampling signal Ig2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 7th microprocessor from signal processing circuit by the 7th optical fiber
End Serial output is to described signal processing control module；
Described 8th from signal processing circuit in order to:
On the one hand current signal Ih1 is processed by rectification, to provide the described 8th work electricity from signal processing circuit
Source, and the current sampling signal Ih2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 8th microprocessor from signal processing circuit by the 8th optical fiber
End Serial output is to described signal processing control module；
Described 9th from signal processing circuit in order to:
On the one hand current signal Ii1 is processed by rectification, to provide the described 9th work electricity from signal processing circuit
Source, and the current sampling signal Ii2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 9th microprocessor from signal processing circuit by the 9th optical fiber
End Serial output is to described signal processing control module.
As a specific embodiment,
Described signal processing control module is provided with 9 optical fiber receiving terminals, in order to receive 9 groups of fiber-optic signals, and 9 described light
Fine receiving terminal be respectively the first optical fiber receiving terminal, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th optical fiber receiving terminal, the
Five optical fiber receiving terminals, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th optical fiber receiving terminal；
Described signal processing control module in order to:
By the first optical fiber receiving terminal, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th optical fiber receiving terminal, the 5th
Optical fiber receiving terminal, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th optical fiber receiving terminal are with described
The first optical fiber receiving terminal in signal processing circuit module, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th optical fiber receive
End, the 5th optical fiber receiving terminal, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th optical fiber receive
End connects one to one, and the current waveform data of the switching every time signal processing control module processed is passed by communication interface
Give described DTU module.
Further, described communication interface is RS-232 interface.
This utility model, owing to using above technical scheme, is allowed to compared with prior art, has the following advantages that and amass
Pole effect:
1, this utility model is by using 9 separate current transformers, solves before and after switching on sampling apparatus
The problem that must have working power, can realize the electric current of load ratio bridging switch in running is carried out omnidistance on-line measurement, make U1
And separate from signal processing circuit between U2 (V1 and V2, W1 and W2), thus there is enough electrical distances, there is peace
The most reliable, easy to use, lightweight, good in anti-interference performance, precision advantages of higher；
2, this utility model is by the computing of measured current waveform, obtain loaded switch from single to double, again from double to single
The current waveform of handoff procedure；
3, this utility model uses light and handy conventional current sensors, easy for installation, reasonable in design, simple in construction；
4, can read, by GPRS network, the waveform that load ratio bridging switch switches every time at any time, convenient and practical.
Accompanying drawing illustrates:
In order to be illustrated more clearly that the technical scheme of this utility model embodiment, required in embodiment being described below
The accompanying drawing used is briefly described.It is clear that the accompanying drawing in describing below is only embodiments more of the present utility model,
For those skilled in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.In accompanying drawing:
Fig. 1 is the overall structure figure of this utility model a kind of load ratio bridging switch electric current on-line measurement unit；
Fig. 2 is the electric from signal processing circuit module of this utility model a kind of load ratio bridging switch electric current on-line measurement unit
Lu Tu；
Fig. 3 is the signal processing control module signal of this utility model a kind of load ratio bridging switch electric current on-line measurement unit
Figure；
Fig. 4 a is the ARM application circuit schematic diagram of this utility model a kind of load ratio bridging switch electric current on-line measurement unit；
Fig. 4 b is the RS-232 interface circuit signal of this utility model a kind of load ratio bridging switch electric current on-line measurement unit
Figure；
Fig. 4 c is Programmable Logic Device CPLD of this utility model a kind of load ratio bridging switch electric current on-line measurement unit
Circuit diagram
Fig. 4 d is Programmable Logic Device CPLD of this utility model a kind of load ratio bridging switch electric current on-line measurement unit
Internal logic circuit schematic diagram；
Fig. 5 is each current waveform figure of X phase in this utility model one load ratio bridging switch electric current on-line measurement unit.
Detailed description of the invention
Below with reference to accompanying drawing of the present utility model, the technical scheme in this utility model embodiment is carried out clear, complete
Whole description and discussion, it is clear that as described herein is only a part of example of the present utility model, is not whole realities
Example, based on the embodiment in this utility model, those of ordinary skill in the art are institute on the premise of not making creative work
The every other embodiment obtained, broadly falls into protection domain of the present utility model.
As it is shown in figure 1, be the overall structure schematic diagram of the present embodiment a kind of load ratio bridging switch electric current on-line measurement unit,
Dotted box portion is switching switch and the tap selector being mechanically connected therewith, and other is the parts of electric current on-line measurement unit,
Including multiple current transformer module, multiple from signal processing circuit module, a power module, a signal processing control module and
One DTU (Data Transfer unit) module.Loaded switch switching always according to K1K2, K2K3, K3K4 or K4K3, K3K2,
K2K1 is that order realization is single to double, double switchings to list.Current transformer module is needed and from signal processing circuit mould on mutually
3 tunnels that block is combined, wherein 2 tunnels are respectively fitted on the conductor that tap selector Dan Shuanyu switching switch is connected, another road
It is enclosed within the conductor of outfan.Wherein:
The quantity of described current transformer module is identical with the described quantity from signal processing circuit module；
Each described current transformer module output two-way current signal to described in its correspondence from signal processing circuit mould
Block, a road current signal is current sampling signal, and another road current signal is to provide described from the work of signal processing circuit module
Make power supply；
From signal processing circuit module on the one hand to the electric current transmitted from described current transformer module described in each
Sampled signal carries out conversion process, and transformation result is stored in caching；On the other hand, described from signal processing circuit module
Transformation result is passed through optical fiber transmitting terminal Serial output to described signal processing control module by microprocessor；
Described power module is connected with described signal processing control module, it is provided that the work of described signal processing control module
Make power supply；
Described signal processing control module is connected from signal processing circuit module with described by optical fiber interface, while the most again with
Described DTU module connects, and processes described through the data of optical fiber transmitting terminal Serial output from signal processing circuit module, and
Send the current waveform data every time switched to described DTU module；
The current waveform data of reception is sent in GPRS network by antenna by described DTU module by communication interface.
In the present embodiment, multiple described current transformer module include 9 separate current transformers altogether, are respectively
First current transformer, the second current transformer, the 3rd current transformer, the 4th current transformer, the 5th current transformer,
Six current transformers, the 7th current transformer, the 8th current transformer and the 9th current transformer；
Multiple described from signal processing circuit module include altogether 9 separate from signal processing circuit, respectively the
One from signal processing circuit, second from signal processing circuit, the 3rd from signal processing circuit, the 4th from signal processing circuit,
Five from signal processing circuit, the 6th from signal processing circuit, the 7th from signal processing circuit, the 8th from signal processing circuit and
Nine from signal processing circuit；
9 described current transformer module export 9 Zu Gong 18 road current signals, respectively Ia1 and Ia2, Ib1 and Ib2,
Ic1 and Ic2, Id1 and Id2, Ie1 and Ie2, If1 and If2, Ig1 and Ig2, Ih1 and Ih2, Ii1 and Ii2；
Described first current transformer in order to:
To described first from signal processing circuit input current signal Ia1 and Ia2, and simultaneously to described first at signal
Reason circuit provides working power；
Described second current transformer in order to:
To described second from signal processing circuit input current signal Ib1 and Ib2, and simultaneously to described second at signal
Reason circuit provides working power；
Described 3rd current transformer in order to:
To the described 3rd from signal processing circuit input current signal Ic1 and Ic2, and simultaneously to the described 3rd at signal
Reason circuit provides working power；
Described 4th current transformer in order to:
To the described 4th from signal processing circuit input current signal Id1 and Id2, and simultaneously to the described 4th at signal
Reason circuit provides working power；
Described 5th current transformer in order to:
To the described 5th from signal processing circuit input current signal Ie1 and Ie2, and simultaneously to the described 5th at signal
Reason circuit provides working power；
Described 6th current transformer in order to:
To the described 6th from signal processing circuit input current signal If1 and If2, and simultaneously to the described 6th at signal
Reason circuit provides working power；
Described 7th current transformer in order to:
To the described 7th from signal processing circuit input current signal Ig1 and Ig2, and simultaneously to the described 7th at signal
Reason circuit provides working power；
Described 8th current transformer in order to:
To the described 8th from signal processing circuit input current signal Ih1 and Ih2, and simultaneously to the described 8th at signal
Reason circuit provides working power；
Described 9th current transformer in order to:
To the described 9th from signal processing circuit input current signal Ii1 and Ii2, and simultaneously to the described 9th at signal
Reason circuit provides working power.
In the present embodiment, described signal processing circuit module is provided with 9 optical fiber transmitting terminals, in order to send 9 groups of optical fiber
Signal, 9 described optical fiber transmitting terminals be respectively the first optical fiber transmitting terminal, the second optical fiber transmitting terminal, the 3rd optical fiber transmitting terminal, the 4th
Optical fiber transmitting terminal, the 5th optical fiber transmitting terminal, six fibers transmitting terminal, the 7th optical fiber transmitting terminal, the 8th optical fiber transmitting terminal and the 9th
Optical fiber transmitting terminal；
Described first from signal processing circuit in order to:
On the one hand current signal Ia1 is processed by rectification, to provide the described first work electricity from signal processing circuit
Source, and the current sampling signal Ia2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described first microprocessor from signal processing circuit by the first optical fiber
End Serial output is to described signal processing control module；
Described second from signal processing circuit in order to:
On the one hand current signal Ib1 is processed by rectification, to provide the described second work electricity from signal processing circuit
Source, and the current sampling signal Ib2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described second microprocessor from signal processing circuit by the second optical fiber
End Serial output is to described signal processing control module；
Described 3rd from signal processing circuit in order to:
On the one hand current signal Ic1 is processed by rectification, to provide the described 3rd work electricity from signal processing circuit
Source, and the current sampling signal Ic2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 3rd microprocessor from signal processing circuit by the 3rd optical fiber
End Serial output is to described signal processing control module；
Described 4th from signal processing circuit in order to:
On the one hand current signal Id1 is processed by rectification, to provide the described 4th work electricity from signal processing circuit
Source, and the current sampling signal Id2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 4th microprocessor from signal processing circuit by the 4th optical fiber
End Serial output is to described signal processing control module；
Described 5th from signal processing circuit in order to:
On the one hand current signal Ie1 is processed by rectification, to provide the described 5th work electricity from signal processing circuit
Source, and the current sampling signal Ie2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 5th microprocessor from signal processing circuit by the 5th optical fiber
End Serial output is to described signal processing control module；
Described 6th from signal processing circuit in order to:
On the one hand current signal If1 is processed by rectification, to provide the described 6th work electricity from signal processing circuit
Source, and the current sampling signal If2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 6th microprocessor from signal processing circuit by six fibers
End Serial output is to described signal processing control module；
Described 7th from signal processing circuit in order to:
On the one hand current signal Ig1 is processed by rectification, to provide the described 7th work electricity from signal processing circuit
Source, and the current sampling signal Ig2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 7th microprocessor from signal processing circuit by the 7th optical fiber
End Serial output is to described signal processing control module；
Described 8th from signal processing circuit in order to:
On the one hand current signal Ih1 is processed by rectification, to provide the described 8th work electricity from signal processing circuit
Source, and the current sampling signal Ih2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 8th microprocessor from signal processing circuit by the 8th optical fiber
End Serial output is to described signal processing control module；
Described 9th from signal processing circuit in order to:
On the one hand current signal Ii1 is processed by rectification, to provide the described 9th work electricity from signal processing circuit
Source, and the current sampling signal Ii2 of input is carried out conversion process, result is stored in caching；
On the other hand, transformation result is sent by the described 9th microprocessor from signal processing circuit by the 9th optical fiber
End Serial output is to described signal processing control module.
In the present embodiment, described signal processing control module is provided with 9 optical fiber receiving terminals, in order to receive 9 groups of optical fiber letters
Number, 9 described optical fiber receiving terminals are respectively the first optical fiber receiving terminal, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th light
Fine receiving terminal, the 5th optical fiber receiving terminal, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th light
Fine receiving terminal.
Described signal processing control module in order to:
By the first optical fiber receiving terminal, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th optical fiber receiving terminal, the 5th
Optical fiber receiving terminal, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th optical fiber receiving terminal are with described
The first optical fiber receiving terminal in signal processing circuit module, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th optical fiber receive
End, the 5th optical fiber receiving terminal, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th optical fiber receive
End connects one to one, and the current waveform data of the switching every time signal processing control module processed passes through communication interface
Send described DTU module to.
In preferred embodiment, described communication interface is RS-232 interface.
It is illustrated in figure 2 a kind of load ratio bridging switch electric current on-line measurement unit from signal processing circuit module diagram,
Including sample conversion circuit, MCU calculation processing circuit, data transmit circuit and power circuit, wherein:
(1) sample conversion circuit
Sample conversion main circuit to be made up of analog-digital converter U2, reference circuit two parts, wherein, and analog-digital converter
The model that (Analog-to-Digital Converter, ADC) U2 uses is AD7895-3, and it is that 14bits, sample rate are
250K, bipolarity input ± 2.5V, single supply+5V, high input impedance, High Speed I2C interface, it is easy to use, can be directly connected to
Various MCU.D1 is LM385-2.5 type Micro Energy Lose voltage-reference diodes, produces 2.5V reference voltage and is supplied to analog-digital converter
U2.Sample rate current is input to the Vin end of analog-digital converter U2 after resistance R3 is converted to voltage, and uses interrupt inquiry mode to read
Take result.
(2) MCU calculation processing circuit
U1 is the core devices of MCU calculation processing circuit, connects sample conversion circuit.In the present embodiment, select
P89LPC938 is MCU (Microcontroller Unit, micro-control unit), and it have employed high performance processor architecture, refers to
The execution time is made only to need 2 to 4 clock cycle, the 80c51 device of 6 times of standards.LPC938 is integrated with in many abundant sheets
Peripheral resource: WDT, UART, I2C、SPI、E2PROM, RTC, A/D, comparator, CCU, detection of power loss etc..Capacity 8KB Flash deposits
Reservoir, internal 768B RAM, technical grade product, capacity of resisting disturbance is strong, operates voltage 2.4～3.6V, I/O compatible 5V logic.
The P1.6 of U1 is the startup conversion that delivery outlet controls ADC, and ADC EOC signal arrives U1's as interrupting input
INT1 mouth, the I of U12C bus SDA, SCL interface receive SDA, SCL interface of U2.
3. data transmit circuit
Data transmit circuit mainly includes U3, U7, U8, U9, and wherein, U3, U7 select the current driver of SN5545 type,
U8, U9 select the fiber optic transmitter of HFBR-1414 type, speed 5Mb/S.
The P0.3 interface of U1 drives U7, CLK interface to drive U8 through U9 through U3, it is achieved data Serial output.
4. power circuit
Power circuit is mainly made up of U5, U6, U4, and current signal is rectified into direct current through R16, U5, adjustable surely through three ends
Processing of circuit output+5V the supply U2 ,+5V of voltage device U6 export+3.3V supply through the processing of circuit of Three-end voltage stabilizer U4
U3。
It is illustrated in figure 3 a kind of load ratio bridging switch electric current on-line measurement cell signal processing and control element (PCE) schematic diagram.Institute
State signal processing control module by ARM application circuit, RS-232 interface circuit, Programmable Logic Device CPLD circuit three big portion group
Become.ARM application circuit is the nucleus module of this unit, and it is by EBI and Programmable Logic Device CPLD circuit phase respectively
Connect, by UART (Universal Asynchronous Receiver/Transmitter, universal asynchronous receiving-transmitting transmitter)
It is connected with RS-232 interface circuit.
Fig. 4 a is ARM application circuit schematic diagram, and described ARM application circuit is mainly made up of U1, U2, J3, J8, and U1 tri-end is steady
Voltage device produces 3.3V and supplies whole circuit, and U2 selects AT91SAM7X256, and it is based on 32 ARM risc processor series
A member in microcontroller, is internally integrated high speed Flash of 256K byte and the SRAM of 64K byte and a complete set of ancillary equipment, its
Include a 802.3Ethernet network interface and a CAN controller.In sheet, Flash memory can connect via JTAG-ICE
Programming in port system, it is also possible to it is preferentially programmed by programmer via parallel interface by product, J3 artificial debugging programs
Interface, J8 Graphic lattice LCD display screen interface.
Fig. 4 b is RS-232 interface circuit diagram, and described RS-232 interface main circuit to be made up of U10 device, and U10 selects
Use MAX3232CSE device, be connected to ARM application circuit by UART.
Fig. 4 c is Programmable Logic Device CPLD circuit schematic diagram, described Programmable Logic Device CPLD circuit mainly by
The device compositions such as U5, U6, U10～U27, U5 selects the active crystal oscillator of ATF1508AS-10JU, U6, U10～U27 selects HFBR_
The optical fiber accepter of 2412 models, speed 5Mb/S.
Tx1～Tx9 be first from signal processing circuit～the 9th from signal processing circuit export serial data；
CP1～CP9 be first from signal processing circuit～the 9th from signal processing circuit export shift clock；
10M signal is that active crystal oscillator exports clock signal；
PA2～PA15 is output 14bit parallel data, and it is connected to the U1 in ARM application circuit；
PA16～PA19 is that ARM application circuit U1 output chip selects control line；
PA20 is the fractional frequency signal of output clock, reads parallel data clock as external cycles, and it is connected to ARM should
With the U1 in circuit.
Fig. 4 d is Programmable Logic Device CPLD internal logic circuit schematic diagram, inside described Programmable Logic Device CPLD
Logic circuit is mainly by the mould such as 9 count14,9dmux, 74193,9 74164_14,9 74377_14,9 74244_14
Block forms.
9dmux truth table is as follows:
74164_14 function:
Tx under CP rising edge, serial data converting parallel data.
Count14 function:
Shifting serial data converting parallel data through 14 times, module sends latch signal to 74377_14, it is achieved parallel
Data latch.Module sends CLR signal, 74164_14 module resets zero setting, prepares displacement next time.
74193 functions:
10M signal exports RDATA signal under the frequency dividing of 74193 modules；
74244_14 function:
Under RDATA signal coordinates, 9dmux completes 9 and selects 1, is input to 74244_14, it is achieved 9 passages are successively read also
Row data.
Be illustrated in figure 5 load ratio bridging switch switch 2 vacuum switches in whole process X phase I1, I2 and load I ripple
Shape, and Fig. 1 dotted line frame represents the state before switching.In conjunction with Fig. 1 and Fig. 5, contact switching proceeds to K2, K3 and bridges position, mistake
Crossing the circulating current produced between resistance, load current is exported by K2, K3, and contact proceeds to K4 position, and finishing switching completes
One grade of conversion to another grade.In oscillogram between 2 dotted line verniers one section reflect that K2, K3 bridge, contact in K1, K2 position,
I1=I；Contact is at K2, K3 position, I1+I2=I；Contact is at K3, K4 position, I2=I.Switching before in K1, K2 position first from
Signal processing circuit has electricity all the time, power circuit has individual farad level electric capacity E1 the most charged.
Bridging position when contact switching proceeds to K2, K3, second begins with electricity from signal processing circuit, and bridge joint process is only
Having 5.94ms, second is not the most stable from signal processing circuit working power, but load I will not interrupt, 1F farad level electric capacity
E1 also ensures from first from signal processing circuit power good, thus can draw I2=I-I1.Same contact is in K4, K3 position
Put I2=I；Contact is at K3, K2 position, I1+I2=I；Contact is at K2, K1 position, I1=I.In K4, K3 position second before switching
All the time there is electricity from signal processing circuit, power circuit has individual farad level electric capacity E1 the most charged.
Bridging position when contact switching proceeds to K3, K2, first begins with electricity from signal processing circuit, and bridge joint process is only
Having several milliseconds (ms), first is not the most stable from signal processing circuit working power, but load I will not interrupt, 1F farad level
Electric capacity E1 also ensures second from signal processing circuit power good, thus to draw I1=I-I2.
By 3 groups of measured current arithmetical operations, no matter from single to double or the complete of handoff procedure can be obtained from double to single
Whole waveform.
It should be noted that from signal processing circuit module core device MCU (microcontroller list described in the present embodiment
Unit, Microcontroller Unit), actually can also use CPLD (Complex Programmable Logic
Device, CPLD) realize identical function.
Described in the present embodiment, the innovative point of load ratio bridging switch electric current on-line measurement unit is by 9 current transformers
Solving the problem of module line between switching switch U1 and U2 (V1 and V2, W1 and W2), electric current arithmetical operation has been used in load
In switch on-line measurement, read the current waveform of switching every time at any time by GPRS network, it is achieved loaded switch inline diagnosis, for
Loaded switch safe operation provides good guarantee.
The above, only this utility model preferably detailed description of the invention, but protection domain of the present utility model is not
Being confined to this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in
Change or replacement, all should contain within protection domain of the present utility model.Therefore, protection domain of the present utility model should
It is as the criterion with scope of the claims.
Claims (5)
1. a load ratio bridging switch electric current on-line measurement unit, it is characterised in that include multiple current transformer module, multiple
From signal processing circuit module, a power module, a signal processing control module and a DTU module, wherein:
The quantity of described current transformer module is identical with the described quantity from signal processing circuit module；
Each described current transformer module output two-way current signal to described in its correspondence from signal processing circuit module, one
Road current signal is current sampling signal, and another road current signal is to provide the described work electricity from signal processing circuit module
Source；
From signal processing circuit module on the one hand to the current sample transmitted from described current transformer module described in each
Signal carries out conversion process, and transformation result is stored in caching；On the other hand, from described micro-from signal processing circuit module
Transformation result is passed through optical fiber transmitting terminal Serial output to described signal processing control module by reason device；
Described power module is connected with described signal processing control module, it is provided that the work electricity of described signal processing control module
Source；
Described signal processing control module is connected from signal processing circuit module with described by optical fiber interface, simultaneously again with described
DTU module connects, and processes described through the data of optical fiber transmitting terminal Serial output from signal processing circuit module, and will be every
The current waveform data of secondary switching sends described DTU module to；
The Wave data of reception is sent in GPRS network by antenna by described DTU module by communication interface.
A kind of load ratio bridging switch electric current on-line measurement unit the most according to claim 1, it is characterised in that:
Multiple described current transformer module include 9 separate current transformers altogether, the respectively first current transformer,
Second current transformer, the 3rd current transformer, the 4th current transformer, the 5th current transformer, the 6th current transformer,
Seven current transformers, the 8th current transformer and the 9th current transformer；
Multiple described from signal processing circuit module include altogether 9 separate from signal processing circuit, respectively first from
Signal processing circuit, second from signal processing circuit, the 3rd from signal processing circuit, the 4th from signal processing circuit, the 5th from
Signal processing circuit, the 6th from signal processing circuit, the 7th from signal processing circuit, the 8th from signal processing circuit and the 9th from
Signal processing circuit；
9 described current transformer module export 9 Zu Gong 18 road current signals, respectively Ia1 and Ia2, Ib1 and Ib2, Ic1 and
Ic2, Id1 and Id2, Ie1 and Ie2, If1 and If2, Ig1 and Ig2, Ih1 and Ih2, Ii1 and Ii2；
Described first current transformer in order to:
To described first from signal processing circuit input current signal Ia1 and Ia2 and simultaneously electric from signal processing to described first
Road provides working power；
Described second current transformer in order to:
To described second from signal processing circuit input current signal Ib1 and Ib2 and simultaneously electric from signal processing to described second
Road provides working power；
Described 3rd current transformer in order to:
To the described 3rd from signal processing circuit input current signal Ic1 and Ic2 and simultaneously electric from signal processing to the described 3rd
Road provides working power；
Described 4th current transformer in order to:
To the described 4th from signal processing circuit input current signal Id1 and Id2 and simultaneously electric from signal processing to the described 4th
Road provides working power；
Described 5th current transformer in order to:
To the described 5th from signal processing circuit input current signal Ie1 and Ie2 and simultaneously electric from signal processing to the described 5th
Road provides working power；
Described 6th current transformer in order to:
To the described 6th from signal processing circuit input current signal If1 and If2 and simultaneously electric from signal processing to the described 6th
Road provides working power；
Described 7th current transformer in order to:
To the described 7th from signal processing circuit input current signal Ig1 and Ig2 and simultaneously electric from signal processing to the described 7th
Road provides working power；
Described 8th current transformer in order to:
To the described 8th from signal processing circuit input current signal Ih1 and Ih2 and simultaneously electric from signal processing to the described 8th
Road provides working power；
Described 9th current transformer in order to:
To the described 9th from signal processing circuit input current signal Ii1 and Ii2 and simultaneously electric from signal processing to the described 9th
Road provides working power.
A kind of load ratio bridging switch electric current on-line measurement unit the most according to claim 2, it is characterised in that:
Described signal processing circuit module is provided with 9 optical fiber transmitting terminals, in order to send 9 groups of fiber-optic signals, 9 described optical fiber
Transmitting terminal be respectively the first optical fiber transmitting terminal, the second optical fiber transmitting terminal, the 3rd optical fiber transmitting terminal, the 4th optical fiber transmitting terminal, the 5th
Optical fiber transmitting terminal, six fibers transmitting terminal, the 7th optical fiber transmitting terminal, the 8th optical fiber transmitting terminal and the 9th optical fiber transmitting terminal；
Described first from signal processing circuit in order to:
On the one hand current signal Ia1 is processed by rectification, to provide the described first working power from signal processing circuit, and
The current sampling signal Ia2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through the first optical fiber transmitting terminal string by the described first microprocessor from signal processing circuit
Row output is to described signal processing control module；
Described second from signal processing circuit in order to:
On the one hand current signal Ib1 is processed by rectification, to provide the described second working power from signal processing circuit, and
The current sampling signal Ib2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through the second optical fiber transmitting terminal string by the described second microprocessor from signal processing circuit
Row output is to described signal processing control module；
Described 3rd from signal processing circuit in order to:
On the one hand current signal Ic1 is processed by rectification, to provide the described 3rd from the working power of signal processing circuit, and
The current sampling signal Ic2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through the 3rd optical fiber transmitting terminal string by the described 3rd microprocessor from signal processing circuit
Row output is to described signal processing control module；
Described 4th from signal processing circuit in order to:
On the one hand current signal Id1 is processed by rectification, to provide the described 4th from the working power of signal processing circuit, and
The current sampling signal Id2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through the 4th optical fiber transmitting terminal string by the described 4th microprocessor from signal processing circuit
Row output is to described signal processing control module；
Described 5th from signal processing circuit in order to:
On the one hand current signal Ie1 is processed by rectification, to provide the described 5th from the working power of signal processing circuit, and
The current sampling signal Ie2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through the 5th optical fiber transmitting terminal string by the described 5th microprocessor from signal processing circuit
Row output is to described signal processing control module；
Described 6th from signal processing circuit in order to:
On the one hand current signal If1 is processed by rectification, to provide the described 6th from the working power of signal processing circuit, and
The current sampling signal If2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through six fibers transmitting terminal string by the described 6th microprocessor from signal processing circuit
Row output is to described signal processing control module；
Described 7th from signal processing circuit in order to:
On the one hand current signal Ig1 is processed by rectification, to provide the described 7th from the working power of signal processing circuit, and
The current sampling signal Ig2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through the 7th optical fiber transmitting terminal string by the described 7th microprocessor from signal processing circuit
Row output is to described signal processing control module；
Described 8th from signal processing circuit in order to:
On the one hand current signal Ih1 is processed by rectification, to provide the described 8th from the working power of signal processing circuit, and
The current sampling signal Ih2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through the 8th optical fiber transmitting terminal string by the described 8th microprocessor from signal processing circuit
Row output is to described signal processing control module；
Described 9th from signal processing circuit in order to:
On the one hand current signal Ii1 is processed by rectification, to provide the described 9th from the working power of signal processing circuit, and
The current sampling signal Ii2 of input is carried out conversion process, and result is stored in caching；
On the other hand, transformation result is passed through the 9th optical fiber transmitting terminal string by the described 9th microprocessor from signal processing circuit
Row output is to described signal processing control module.
A kind of load ratio bridging switch electric current on-line measurement unit the most according to claim 2, it is characterised in that:
Described signal processing control module is provided with 9 optical fiber receiving terminals, and in order to receive 9 groups of fiber-optic signals, 9 described optical fiber connect
Receiving end is respectively the first optical fiber receiving terminal, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th optical fiber receiving terminal, the 5th light
Fine receiving terminal, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th optical fiber receiving terminal；
Described signal processing control module in order to:
By the first optical fiber receiving terminal, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th optical fiber receiving terminal, the 5th optical fiber
Receiving terminal, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th optical fiber receiving terminal and described signal
The first optical fiber receiving terminal in processing circuit module, the second optical fiber receiving terminal, the 3rd optical fiber receiving terminal, the 4th optical fiber receiving terminal,
5th optical fiber receiving terminal, six fibers receiving terminal, the 7th optical fiber receiving terminal, the 8th optical fiber receiving terminal and the 9th optical fiber receiving terminal one
One corresponding connection, and the current waveform data of the switching every time of signal processing control module process is sent to by communication interface
Described DTU module.
5. according to a kind of load ratio bridging switch electric current on-line measurement unit described in claim 1 or 4, it is characterised in that described
Communication interface is RS-232 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620741553.7U CN205844392U (en) | 2016-07-14 | 2016-07-14 | A kind of load ratio bridging switch electric current on-line measurement unit |
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|---|---|---|---|
| CN201620741553.7U CN205844392U (en) | 2016-07-14 | 2016-07-14 | A kind of load ratio bridging switch electric current on-line measurement unit |
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| CN205844392U true CN205844392U (en) | 2016-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768212A (en) * | 2019-10-25 | 2020-02-07 | 南方电网科学研究院有限责任公司 | Transformer internal short-circuit fault protection device and control method thereof |
-
2016
- 2016-07-14 CN CN201620741553.7U patent/CN205844392U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768212A (en) * | 2019-10-25 | 2020-02-07 | 南方电网科学研究院有限责任公司 | Transformer internal short-circuit fault protection device and control method thereof |
| CN110768212B (en) * | 2019-10-25 | 2021-09-03 | 南方电网科学研究院有限责任公司 | Transformer internal short-circuit fault protection device and control method thereof |
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