CN205620457U - PT secondary voltage signal isolation sampling device based on isolation transformer - Google Patents
PT secondary voltage signal isolation sampling device based on isolation transformer Download PDFInfo
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- CN205620457U CN205620457U CN201620413602.4U CN201620413602U CN205620457U CN 205620457 U CN205620457 U CN 205620457U CN 201620413602 U CN201620413602 U CN 201620413602U CN 205620457 U CN205620457 U CN 205620457U
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- 238000002955 isolation Methods 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 title abstract description 11
- 238000002474 experimental method Methods 0.000 abstract description 9
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000003556 assay Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model discloses a PT secondary voltage signal isolation sampling device based on isolation transformer, including PT voltage transformer, isolation transformer and control box, PT voltage transformer connects and be used for acquireing the PT secondary voltage signal on the generating line, PT secondary voltage signal input is to isolation transformer's inlet side, isolation transformer's outlet side and control box are connected. The utility model discloses a reference voltage who selects at the PT secondary side sets up the security that isolation transformer comes the protection to acquire reference signal, has avoided directly acquireing reference signal's potential safety hazard through the cable, has avoided electrified operating generating line or be qualified for the next round of competitions the PT secondary side taking place the accident phenomenon that the short circuit leads to the PT damage. Realized that input GIS with the controlling means's of homophase ac voltage withstand test experiment frequently reference signal and electric the completely cutting off between the on -the -spot signal sampling PT, has cut off the of each other transmission of abnormal signal between reference signal sample PT and test device.
Description
Technical field
This utility model relates to technical field of electric power, the isolation sampling of a kind of PT secondary voltage signal based on isolating transformer
Device.
Background technology
Cubicle Gas-Insulated Switchgear (hereinafter referred to as GIS) is applied more and more extensive in power system, but GIS exists
After interval enlarging and maintenance (particularly double bus scheme GIS), it is required to carry out in the case of original operation brownout pressure
Test.GIS expansion spacing or Disintegration overhaul interval are only disconnected by disconnecting switch with adjacent operation part, if operation part is not stopped
Electricity, then keep apart during ac voltage withstanding at shutoff mouth it may happen that superpose reverse with working voltage of test voltage causes isolation fracture to hit
Pierce into and jeopardize the situation of operation equipment, therefore the GIS pressure test of the standard such as DL/T 555, DL/T 617, DL/T 618 regulation
Time neighbouring device answer power-off ground connection, be otherwise considered as taking measures owing to puncturing suddenly the damage that original part is caused.Therefore,
At GIS with in frequency homophase ac voltage withstanding test method, owing to GIS uses neighbouring device fortune with frequency homophase ac voltage withstanding experimental technique
Row voltage (such as taking bus-bar potential transformer secondary side voltage) as the reference voltage, obtains test voltage by resonance manner, and
Utilize PHASE-LOCKED LOOP PLL TECHNIQUE that its frequency and phase place are carried out real time dynamic tracing, make at test voltage and the frequency of working voltage and phase place
In with frequency cophasal state.Visible, being chosen in rectification process of the test of reference voltage signal is particularly important.At present, GIS is with frequency
Homophase ac voltage withstanding experimental technique typically carries out sample of signal bis-times from bus-bar potential transformer PT, and the main method used is to pass through
A piece longer cable, is conveyed directly to the GIS switchgear control chamber with frequency homophase power supply, as it is shown in figure 1, in Fig. 1 be
On-the-spot GIS ac voltage withstanding wiring schematic diagram, wherein, 1 is with frequency homophase experiment power supply；2 is series resonant equipment；3 is dividing potential drop
Device；4 is alternating current power supply.Directly it is sampled from voltage transformer pt secondary voltage signal, it is ensured that reference voltage signal and band
Electricity equipment working voltage frequency and the concordance of phase place.But there is following potential safety hazard in the method: 1) when reference signal is at test dress
Putting control chamber input side when being short-circuited, this short circuit may cause PT second short circuit, and then damages PT；2) due to pressure test
Device control chamber scene needs external 220V power frequency AC to power, when the internal outlet fault of control chamber causes reference signal side to occur
During abnormal voltage signal, this abnormal voltage signal also will act on PT secondary side simultaneously, causes occurring the most electric at PT primary side
Pressure signal, this is it would be possible to cause the second protection generation action of this part, causes power outage.
Accordingly, it would be desirable to a kind of sampler realizing safety sampling PT signal while ensureing reference signal accuracy.
Utility model content
One of the purpose of this utility model is to propose a kind of PT secondary voltage signal based on isolating transformer isolation sampler；Should
Device can realize the sampler of safety sampling PT signal while ensureing reference signal accuracy.
The purpose of this utility model is achieved through the following technical solutions:
A kind of based on isolating transformer the PT secondary voltage signal isolation sampler that this utility model provides, including PT voltage
Transformer, isolating transformer and control chamber；
Described PT voltage transformer is connected on bus for obtaining PT secondary voltage signal；
Described PT secondary voltage signal is input to the input side of isolating transformer；The outlet side of described isolating transformer is with control chamber even
Connect.
Further, described isolating transformer input side is provided with the insurance fuse for preventing the isolating transformer short-circuit of terminals.
Further, described isolating transformer outlet side is provided with the insurance fuse for preventing the isolating transformer short-circuit of terminals.
Further, described isolating transformer input side is provided with the 3 core sockets being connected with input port.
Further, described isolating transformer outlet side is provided with the 3 core sockets being connected with input port.
Further, described isolating transformer outlet side port has been arranged in parallel warning circuit, and described warning circuit includes being sequentially connected in series
Commutation diode, resistance and light emitting diode.
Owing to have employed technique scheme, this utility model has the advantage that
This utility model arranges isolating transformer by the reference voltage chosen at PT secondary side and protects the peace of acquisition reference signal
Quan Xing, it is to avoid directly obtained the potential safety hazard of reference signal by cable, it is to avoid the bus in charging operation or outlet PT bis-
Secondary side is short-circuited the accident phenomenon causing PT to damage.Control device for GIS with frequency homophase ac voltage withstanding and provide one and operation
Equipment same frequency, synchronous primary signal.Achieve the input GIS reference letter with frequency homophase ac voltage withstanding experimental control device
Number and on-site signal sampling PT between electrical isolation, cut off abnormal signal reference signal sampling PT and assay device between
Mutual transmission.
Other advantages of the present utility model, target and feature will be illustrated to a certain extent in the following description, and
To a certain extent, will be apparent to those skilled in the art based on to investigating hereafter, or can be from
Practice of the present utility model is instructed.Target of the present utility model and other advantages can be realized by description below
And acquisition.
Accompanying drawing explanation
Accompanying drawing of the present utility model is described as follows.
Fig. 1 is on-the-spot GIS ac voltage withstanding wiring schematic diagram of the present utility model.
Fig. 2 is PT secondary sample isolated location internal structure schematic diagram of the present utility model.
Fig. 3 is that GIS chooses wiring schematic diagram with frequency homophase ac voltage withstanding reference signal.
In figure: 1 is with frequency homophase experiment power supply；2 is series resonant equipment；3 is potentiometer；4 be alternating current power supply, 5 for control
Case processed.
Detailed description of the invention
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As it can be seen, PT secondary voltage signal based on the isolating transformer isolation sampler that the present embodiment provides, including PT
Voltage transformer, isolating transformer and control chamber；
Described PT voltage transformer is connected on bus for obtaining PT secondary voltage signal；
Described PT secondary voltage signal is input to the input side of isolating transformer；The outlet side of described isolating transformer is with control chamber even
Connect.
Described isolating transformer input side is provided with the insurance fuse for preventing the isolating transformer short-circuit of terminals.
Described isolating transformer outlet side is provided with the insurance fuse for preventing the isolating transformer short-circuit of terminals.
Described isolating transformer input side is provided with the 3 core sockets being connected with input port.
Described isolating transformer outlet side is provided with the 3 core sockets being connected with input port.
Described isolating transformer outlet side port has been arranged in parallel warning circuit, and described warning circuit includes the rectification two being sequentially connected in series
Pole pipe, resistance and light emitting diode.
Embodiment 2
The PT secondary singal that the present embodiment provides is the signal taken out from on-the-spot voltage transformer convergence control cabinet, and this signal is tested phase
Bus PT secondary voltage signal, then sends into the input side of isolating transformer, electromagnetic induction based on isolating transformer by this signal
Principle, in the case of guarantee output signal amplitude, frequency and phase place are constant with input side signal, by signal output to same with frequency
Phase power controling box, it is achieved that the electrical isolation of signal, has reached the purpose of isolation sampling.
PT secondary voltage signal based on the isolating transformer isolation sampler that the present embodiment provides, it is achieved that PT secondary singal
Sampling end and with the signal-isolated transmission between frequency homophase power controling box, it is to avoid because of control chamber side, short circuit occurs in process of the test
Or abnormal signal causes PT or primary equipment that the potential safety hazard having a power failure occurs.
The concrete internal structure of this device, as in figure 2 it is shown, Fig. 2 is PT secondary sample isolated location internal structure, exports and with input is
Completely isolated.Owing to being the electromagnetic induction principle utilizing isolating transformer, therefore ensure that input and output frequency is identical.Isolation becomes
Depressor is primary, secondary coil is wound around according to the functional requirement realized, it is ensured that input signal, phase of output signal are identical, amplitude
Unanimously.When input voltage is more than 20V, red LED display lamp is lighted, and shows that outfan has ac voltage signal.Through every
After cell isolation, if being short-circuited between terminal, the fuse in isolated location is by fusing thus plays a protective role, shutoff signal
Transmission, thus avoid PT secondary damage.The present embodiment by isolated location signal flow on installation insurance fuse, work as both sides
Shutoff signal transmission during signal fault, it is achieved that to control chamber and the protection of signal sampling PT.
Embodiment 3
As it is shown on figure 3, the GIS that the present embodiment provides is with frequency homophase alternating-current voltage resistance test device, use neighbouring device working voltage
(such as taking bus-bar potential transformer secondary side voltage) as the reference voltage, obtains test voltage by resonance manner, and utilizes lock
Phase loop technique carries out real time dynamic tracing to its frequency and phase place, makes test voltage be in frequency with frequency and the phase place of working voltage
Cophasal state, as it is shown in figure 1, as shown in FIG., what the present embodiment provided has the homophase GIS ac voltage withstanding wiring of on-the-spot same frequency
The same frequency homophase Withstand test device of safe sampled signal, including with frequency homophase experiment power supply 1, series resonant equipment 2, potentiometer
3, alternating current power supply 4, equipment for converting and insulating and control chamber 5；
Described alternating current power supply is connected with frequency homophase experiment power supply；Described same frequency homophase experiment power supply by series resonant equipment and divides
Depressor connects；Described potentiometer and the interval Cx to be tested being connected on bus are connected；Described equipment for converting and insulating is arranged at control
Between case and voltage transformer pt；Described control chamber is connected with frequency homophase experiment power supply；Described voltage transformer pt equipment is used
In obtaining reference signal on bus.
The reference signal chosen is exported to GIS with frequency homophase in the way of phase invariant, frequency are constant by described isolation and switching device
In the control chamber of assay device, as the reference signal of test High voltage output.
Described isolation and switching device includes reference signal judge module and overcurrent and overvoltage protector；Described reference signal judge module
For receiving reference signal from voltage transformer pt, and judge whether reference signal is abnormal signal；Described over-current over-voltage protection fills
Put and be connected with reference signal judge module；Described overcurrent and overvoltage protector is used for cutting off between voltage transformer pt and control chamber and connects
Connect.
Finally illustrating, above example is only in order to illustrate the technical solution of the utility model and unrestricted, although with reference to preferably
This utility model has been described in detail by embodiment, it will be understood by those within the art that, can be to this utility model
Technical scheme modify or equivalent, without deviating from objective and the scope of the technical program, it all should be contained in this reality
In the middle of novel right.
Claims (6)
1. PT secondary voltage signal based on an isolating transformer isolation sampler, it is characterised in that: include that PT voltage is mutual
Sensor, isolating transformer and control chamber；
Described PT voltage transformer is connected on bus for obtaining PT secondary voltage signal；
Described PT secondary voltage signal is input to the input side of isolating transformer；The outlet side of described isolating transformer is with control chamber even
Connect.
2. PT secondary voltage signal based on isolating transformer isolation sampler as claimed in claim 1, it is characterised in that:
Described isolating transformer input side is provided with the insurance fuse for preventing the isolating transformer short-circuit of terminals.
3. PT secondary voltage signal based on isolating transformer isolation sampler as claimed in claim 1, it is characterised in that:
Described isolating transformer outlet side is provided with the insurance fuse for preventing the isolating transformer short-circuit of terminals.
4. PT secondary voltage signal based on isolating transformer isolation sampler as claimed in claim 1, it is characterised in that:
Described isolating transformer input side is provided with the 3 core sockets being connected with input port.
5. PT secondary voltage signal based on isolating transformer isolation sampler as claimed in claim 1, it is characterised in that:
Described isolating transformer outlet side is provided with the 3 core sockets being connected with input port.
6. PT secondary voltage signal based on isolating transformer isolation sampler as claimed in claim 1, it is characterised in that:
Described isolating transformer outlet side port has been arranged in parallel warning circuit, commutation diode that described warning circuit includes being sequentially connected in series,
Resistance and light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620413602.4U CN205620457U (en) | 2016-05-09 | 2016-05-09 | PT secondary voltage signal isolation sampling device based on isolation transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620413602.4U CN205620457U (en) | 2016-05-09 | 2016-05-09 | PT secondary voltage signal isolation sampling device based on isolation transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205620457U true CN205620457U (en) | 2016-10-05 |
Family
ID=57025877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620413602.4U Active CN205620457U (en) | 2016-05-09 | 2016-05-09 | PT secondary voltage signal isolation sampling device based on isolation transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN205620457U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932623A (en) * | 2019-03-25 | 2019-06-25 | 重庆大学 | Test method is mutually exchanged with frequently same with the GIS of phase-shifting transformer based on phase matched combination |
| CN113358912A (en) * | 2021-06-11 | 2021-09-07 | 南方电网数字电网研究院有限公司 | Voltage measuring device, voltage measuring method, and storage medium |
-
2016
- 2016-05-09 CN CN201620413602.4U patent/CN205620457U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932623A (en) * | 2019-03-25 | 2019-06-25 | 重庆大学 | Test method is mutually exchanged with frequently same with the GIS of phase-shifting transformer based on phase matched combination |
| CN109932623B (en) * | 2019-03-25 | 2021-06-08 | 重庆大学 | GIS same-frequency and same-phase test method based on phase matching combination and phase-shifting transformer |
| CN113358912A (en) * | 2021-06-11 | 2021-09-07 | 南方电网数字电网研究院有限公司 | Voltage measuring device, voltage measuring method, and storage medium |
| CN113358912B (en) * | 2021-06-11 | 2022-03-08 | 南方电网数字电网研究院有限公司 | Voltage measuring device, voltage measuring method, and storage medium |
| US11703529B2 (en) | 2021-06-11 | 2023-07-18 | Digital Grid Research Institute, China So Po Grid | Voltage measurement device, voltage measurement method, and storage medium |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |