CN107515326A - Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage - Google Patents
Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage Download PDFInfo
- Publication number
- CN107515326A CN107515326A CN201710898193.0A CN201710898193A CN107515326A CN 107515326 A CN107515326 A CN 107515326A CN 201710898193 A CN201710898193 A CN 201710898193A CN 107515326 A CN107515326 A CN 107515326A
- Authority
- CN
- China
- Prior art keywords
- voltage
- signal
- circuit
- current
- resistance
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 238000002955 isolation Methods 0.000 claims abstract description 26
- 238000009413 insulation Methods 0.000 claims abstract description 13
- 230000005684 electric field Effects 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims abstract description 5
- 239000000654 additive Substances 0.000 claims description 16
- 230000000996 additive effect Effects 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Insulation specimen current wireless detection device belongs to the electric property detection device of converter power transformer dielectric under high direct voltage under a kind of converter power transformer high direct voltage of the present invention；Include high voltage direct current generator, insulation sample, preposition sample circuit, signal isolation change-over circuit, signal operation process circuit, wireless transmission unit and host computer successively according to signal transfer direction, the preposition sample circuit, signal isolation change-over circuit, signal operation process circuit and wireless transmission unit are placed in strong electric field environment, described preposition sample circuit is used to gather the signal for carrying out self-insulating sample, and signal operation process circuit is transferred to by signal isolation change-over circuit, signal after calculation process, then host computer is sent to by wireless transmission unit；Insulation specimen current wireless detection device under a kind of converter power transformer high direct voltage is realized, the present invention is using host computer real-time radio collection electric current, it is not necessary to which artificial meter reading, the gathered data unlimited time, frequency is higher.
Description
Technical field
Insulation specimen current wireless detection device belongs under high direct voltage under a kind of converter power transformer high direct voltage of the present invention
The electric property detection device of converter power transformer dielectric.
Background technology
Converter power transformer is vital equipment in DC transmission system, and the reliability of converter power transformer directly affects
The construction and operation of transmission system.The operating insulation fault of converter power transformer proportion in whole failures is 50%, comprehensive
The fault statistics data for closing domestic and international DC transmission system shows that the Insulation Problems of the primary equipment headed by converter power transformer are still
It is the principal element for causing DC transmission system forced outage.Domestic and international researcher is carried out for converter power transformer insulation characterisitic
Numerous studies, but in experimental method, because converter power transformer insulation experiment is all high pressure strong electric field environment, in forceful electric power
Collection under the environment of field to specimen current also rests on the artificial stage for using general-purpose meter reading, and this mode manually gathered has
Many uncontrollable drawbacks, the collection of electric current and synchronousness are poor, and gathered data amount is limited, and frequency is relatively low.So need
Research is a kind of mainly for the specimen current wireless detection device that insulated under converter power transformer DC high potential test.
The content of the invention
In view of the above-mentioned problems, the invention provides the specimen current radio detection that insulated under a kind of converter power transformer high direct voltage
Device.
The object of the present invention is achieved like this：
Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, according to signal transfer direction successively
Including high voltage direct current generator, insulation sample, preposition sample circuit, signal isolation change-over circuit, signal operation process circuit, nothing
Line transmission unit and host computer, the preposition sample circuit, signal isolation change-over circuit, signal operation process circuit and wireless biography
Defeated unit is placed in strong electric field environment, and described preposition sample circuit is used to gather the signal for carrying out self-insulating sample, and passes through letter
Number isolation change-over circuit is transferred to signal operation process circuit, the signal after calculation process, then is sent out by wireless transmission unit
Give host computer.
Further, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, before described
Putting sample circuit includes voltage-regulator diode D1, voltage-regulator diode D2, voltage-regulator diode D3, voltage-regulator diode D4, voltage-regulator diode
D5, voltage-regulator diode D6, resistance R1, resistance R2, resistance R3 and resistance R4；The pole of voltage stabilizing two that high voltage input terminal passes through Opposite direction connection
Pipe D1 and voltage-regulator diode D2 ground connection, is grounded, resistance R1 and resistance R2 tie points pass through resistance R4 by resistance R1 and resistance R2
High-current output end is connected, High-current output end is grounded by the voltage-regulator diode D3 and voltage-regulator diode D4 of Opposite direction connection, high
Input is pressed by resistance R3 connection low current output ends, low current output end is by the voltage-regulator diode D5 of Opposite direction connection and surely
Press diode D6 ground connection.
Further, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, the letter
Number isolation change-over circuit by current signal be converted to needed for measurement voltage signal, while two are used to current signal magnitude range
Road signal acquisition, amplification several times regulation.
Further, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, the letter
Number isolation change-over circuit cooperates protection circuit when overtension occurs with 6 voltage-regulator diodes.
Further, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, the letter
Number arithmetic processing circuit low current sampling end and high current sampling end；The low current sampling end include the voltage that is sequentially connected with
Become voltage signal, the electricity by resistance with device, in-phase proportion amplifying circuit and with additive process computing circuit, low current signal
Signal is pressed to flow into operational amplifier by voltage follower, the voltage signal after amplifying by operational amplifier flows into same be added
Method computing circuit, the voltage signal zero point is raised by same additive process computing circuit, keeps former low current signal waveform not
Become, obtain wireless transmission unit institute energy transmission range voltage signal；The high current sampling end includes the voltage being sequentially connected
Follower and with additive process computing circuit, high current signal becomes voltage signal by resistance, and the voltage signal flows into same phase
Adder operation circuit, the voltage signal zero point is raised by same additive process computing circuit, keeps former high current signal waveform
It is constant, obtain wireless transmission unit can transmission range voltage signal.
Further, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, the present invention
It is arranged on and is capable of in the metal box of opening and closing of fault, the metal box earthing of casing.
Beneficial effect：
Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage of the present invention, preposition sample circuit,
Signal isolation change-over circuit, signal operation process circuit and wireless transmission unit are placed in strong electric field environment, preposition sample circuit
Carry out the signal of self-insulating sample for gathering, and signal operation process circuit is transferred to by signal isolation change-over circuit, pass through
Signal after calculation process, then host computer is sent to by wireless transmission unit, realize under a kind of converter power transformer high direct voltage
Insulate specimen current wireless detection device；
Compared with former technology, the collection under strong electric field environment to specimen current, which also rests on, manually uses general-purpose meter reading
Stage, this mode manually gathered has many uncontrollable drawbacks, and the collection of electric current and synchronousness are poor, gather number
Limited according to measuring, frequency is relatively low, and the present invention is using host computer real-time radio collection electric current, it is not necessary to artificial meter reading, gathered data
Unlimited time, frequency are higher.
Brief description of the drawings
Fig. 1 is insulation specimen current wireless detection device structure diagram under a kind of converter power transformer high direct voltage.
Fig. 2 is preposition sample circuit circuit diagram.
Fig. 3 is signal operation process circuit low current process circuit figure.
Fig. 4 is signal operation process circuit high current process circuit figure.
In figure：1 preposition sample circuit, the conversion of 2 signal isolations, 3 signal operation process circuits, 4 wireless transmission units, on 5
Position machine.
Embodiment
The specific embodiment of the invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment one
Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, as shown in figure 1, being passed according to signal
Pass direction includes high voltage direct current generator, insulation sample, preposition sample circuit 1, signal isolation change-over circuit 2, signal fortune successively
Calculate process circuit 3, wireless transmission unit 4 and host computer 5, the preposition sample circuit 1, signal isolation change-over circuit 2, signal fortune
Calculate process circuit 3 and wireless transmission unit 4 is placed in strong electric field environment, described preposition sample circuit 1 is used to gather to alienate oneself
The signal of edge sample, and signal operation process circuit 3 is transferred to by signal isolation change-over circuit 2, after calculation process
Signal, then host computer 5 is sent to by wireless transmission unit 4.
As shown in figure 1, being acquired amplification to the electric current for flowing through sample by preposition sample circuit 1 is converted to voltage letter
Number, voltage signal change 2 pressure-resistant apparatus by signal isolation and flow into signal operation process circuit 3, voltage signal is passed through into amplifier
Calculating is converted to voltage signal, voltage signal in the institute of wireless transmission unit 4 energy measurement range and passed through at the collection of wireless transmission unit 4
Carry out being wirelessly transferred after reason and be sent to wireless receiving end, wireless receiving end serves data to the software of computer position 5, finally
As a result or curve will be shown on the upper software of seat in the plane 5.
The course of work：Preposition sample circuit 1 can extract to the high-voltage direct current signal I for flowing through insulation sample, pass through
Cross I/V and be converted to voltage signal U1, if voltage signal U1 remains in that U1 in the range of safe voltage by signal isolation conversion 2
Entering signal arithmetic processing circuit 3 is transmitted, carrying out amplifier by signal operation process circuit 3 is calculated the wireless biography of satisfaction
Voltage signal U2 in the defeated measurement range of unit 4, signal acquisition and wireless transmission by wireless transmission unit 4, voltage is believed
Number U2 is transferred to radio receiving unit, and signal U2 is supplied to upper seat in the plane 5 by wireless receiving end, and final result or curve will be in upper machines
Shown on the software of position.
Embodiment two
Specifically, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, such as Fig. 2 institutes
Show, the preposition sample circuit 1 include voltage-regulator diode D1, voltage-regulator diode D2, voltage-regulator diode D3, voltage-regulator diode D4,
Voltage-regulator diode D5, voltage-regulator diode D6, resistance R1, resistance R2, resistance R3 and resistance R4；High voltage input terminal passes through Opposite direction connection
Voltage-regulator diode D1 and voltage-regulator diode D2 ground connection, be grounded by resistance R1 and resistance R2, resistance R1 and resistance R2 tie points
By resistance R4 connection High-current outputs end, the voltage-regulator diode D3 and voltage-regulator diode that High-current output end passes through Opposite direction connection
D4 is grounded, and high voltage input terminal is by resistance R3 connection low current output ends, the voltage stabilizing two that low current output end passes through Opposite direction connection
Pole pipe D5 and voltage-regulator diode D6 ground connection.
Specifically, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, the signal
Isolation change-over circuit 2 is converted to current signal the voltage signal of required measurement, while uses two to current signal magnitude range
Road signal acquisition, amplification several times regulation.
Specifically, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, the signal
Isolate change-over circuit 2 when overtension occurs, cooperated protection circuit with 6 voltage-regulator diodes.
Described preposition sample circuit 1 includes two-way current signal extraction circuit, when measured current signal changes model
By automatic switch-over circuit when enclosing larger, signal isolation conversion 2 corresponds to two and enters two to go out direct current signal isolation conversion, at signal operation
Reason circuit is similarly two-way processing, is wirelessly transferred and is similarly two-way and is wirelessly transferred, when current signal is smaller, Super-Current Measurement electricity
Road is unchanged, when current signal is larger, small current measurement circuit voltage signal clamper, and the work of high current signal processing circuit,
Due to being to gather not influence data analysis simultaneously.In order to prevent under strong electric field environment, the present invention can spot electricity in measurement
Position voltage raises problem, and we place the larger protective resistance of resistance in preposition sample circuit 1 and clamped with voltage-regulator diode
Position protection, while signal isolation reforming unit is added between preposition sample circuit and signal processing circuit, signal isolation dress
Put and acted on overvoltage protection, the protection played jointly to detection means with the protective resistance in preposition sample circuit and TVS is made
With.
Preposition sample circuit 1 is gathered simultaneously using two-way, and two-way works as electricity for the larger DC current signal of excursion
When stream signal is smaller, the work of low current signal acquisition circuit, the voltage signal in ideal range can obtain；When current signal is more than
During a certain critical value, low current signal acquisition circuit clamper, high current signal acquisition circuit work, through overcurrent signal times magnification
Number difference obtains voltage signal in ideal range, so as to obtain complete specimen current data.
Embodiment three
Specifically, insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, such as Fig. 3 and figure
Shown in 4, the low current sampling end of signal operation process circuit 3 and high current sampling end；The low current sampling end include according to
The voltage follower of secondary connection, in-phase proportion amplifying circuit and become with additive process computing circuit, low current signal by resistance
Voltage signal, the voltage signal flow into operational amplifier, the electricity after amplifying by operational amplifier by voltage follower
Press signal to flow into additive process computing circuit, raised the voltage signal zero point by same additive process computing circuit, keep former
Low current signal waveform is constant, obtain wireless transmission unit 4 can transmission range voltage signal；The high current sampling end bag
Include the voltage follower that is sequentially connected and with additive process computing circuit, high current signal becomes voltage signal by resistance, described
Voltage signal is flowed into additive process computing circuit, is raised the voltage signal zero point by same additive process computing circuit, is kept
Former high current signal waveform is constant, obtain wireless transmission unit 4 can transmission range voltage signal.
Specifically, insulated specimen current wireless detection device under a kind of converter power transformer high direct voltage, and the present invention is set
Put and be capable of in the metal box of opening and closing of fault, the metal box earthing of casing.
Signal operation process circuit 3 is using the two-way process signal for corresponding to preposition sample circuit 1.Before low current signal passes through
The voltage signal for putting the amplification conversion gained of sample circuit 1 flows into operational amplifier by voltage follower, is obtained by operation amplifier
To new voltage signal, new voltage signal passes through add circuit, and gained voltage signal is carried out into computing and zero point raises place
Reason obtains the voltage signal needed for us, is transferred to wireless transmission unit 4.It can also be obtained when similarly high current process circuit works
To required voltage signal, wireless transmission unit 4 is transferred to.
To prevent electromagnetic interference under strong electric field environment, the present invention is arranged in switchable closing metal box, the earthing of casing.
Described wireless transmission unit 4 includes data acquisition end, wireless transmission end and wireless receiving end three parts, nothing
Line number is acquired according to collection terminal to signal is sent to wireless reception end by transmitting wirelessly end by the signal collected, wirelessly connects
The data obtained is supplied to computer position software by receiving end.
Claims (6)
1. insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage, it is characterised in that is passed according to signal
Pass direction includes high voltage direct current generator, insulation sample, preposition sample circuit (1), signal isolation change-over circuit (2), letter successively
Number arithmetic processing circuit (3), wireless transmission unit (4) and host computer (5), the preposition sample circuit (1), signal isolation conversion
Circuit (2), signal operation process circuit (3) and wireless transmission unit (4) are placed in strong electric field environment, described preposition sampling electricity
Road (1) is used to gather the signal for carrying out self-insulating sample, and is transferred to signal operation processing electricity by signal isolation change-over circuit (2)
Road (3), the signal after calculation process, then host computer (5) is sent to by wireless transmission unit (4).
2. insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage according to claim 1, it is special
Sign is that the preposition sample circuit (1) includes voltage-regulator diode D1, voltage-regulator diode D2, voltage-regulator diode D3, the pole of voltage stabilizing two
Pipe D4, voltage-regulator diode D5, voltage-regulator diode D6, resistance R1, resistance R2, resistance R3 and resistance R4；High voltage input terminal passes through anti-
It is grounded to the voltage-regulator diode D1 and voltage-regulator diode D2 of connection, is grounded by resistance R1 and resistance R2, resistance R1 and resistance R2
For tie point by resistance R4 connection High-current outputs end, High-current output end passes through the voltage-regulator diode D3 of Opposite direction connection and voltage stabilizing
Diode D4 is grounded, and high voltage input terminal passes through Opposite direction connection by resistance R3 connection low current output ends, low current output end
Voltage-regulator diode D5 and voltage-regulator diode D6 ground connection.
3. insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage according to claim 2, it is special
Sign is that the signal isolation change-over circuit (2) is converted to current signal the voltage signal of required measurement, while electric current is believed
Number magnitude range is gathered using two paths of signals, amplification several times regulation.
4. insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage according to claim 1, it is special
Sign is, the signal isolation change-over circuit (2) cooperates guarantor when overtension occurs with 6 voltage-regulator diodes
Protection circuit.
5. insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage according to claim 1, it is special
Sign is, signal operation process circuit (3) the low current sampling end and high current sampling end；The low current sampling end includes
The voltage follower that is sequentially connected, in-phase proportion amplifying circuit and become with additive process computing circuit, low current signal by resistance
Into voltage signal, the voltage signal flows into operational amplifier by voltage follower, after amplifying by operational amplifier
Voltage signal is flowed into additive process computing circuit, is raised the voltage signal zero point by same additive process computing circuit, is kept
Former low current signal waveform is constant, obtain wireless transmission unit (4) can transmission range voltage signal；The high current sampling
End includes the voltage follower being sequentially connected and becomes voltage signal by resistance with additive process computing circuit, high current signal,
The voltage signal is flowed into additive process computing circuit, is raised the voltage signal zero point by same additive process computing circuit,
Keep former high current signal waveform constant, obtain wireless transmission unit (4) can transmission range voltage signal.
6. according to the specimen current radio detection that insulated under a kind of converter power transformer high direct voltage of claim 1,2,3,4 or 5
Device, it is characterised in that the present invention, which is arranged on, is capable of in the metal box of opening and closing of fault, the metal box earthing of casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710898193.0A CN107515326A (en) | 2017-09-28 | 2017-09-28 | Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710898193.0A CN107515326A (en) | 2017-09-28 | 2017-09-28 | Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107515326A true CN107515326A (en) | 2017-12-26 |
Family
ID=60725821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710898193.0A Pending CN107515326A (en) | 2017-09-28 | 2017-09-28 | Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107515326A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252962A (en) * | 2021-05-13 | 2021-08-13 | 国网黑龙江省电力有限公司电力科学研究院 | Wireless detection device for current of insulation sample under direct-current high voltage of converter transformer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005181148A (en) * | 2003-12-19 | 2005-07-07 | Midori Anzen Co Ltd | Insulation monitoring device |
| CN101713810A (en) * | 2009-12-23 | 2010-05-26 | 西安交通大学 | Test unit for monitoring oil-paper insulation state |
| CN104133165A (en) * | 2014-07-07 | 2014-11-05 | 广东电网公司电力科学研究院 | Transformer oilpaper insulation test system |
| CN204347138U (en) * | 2014-12-26 | 2015-05-20 | 华北电力大学 | A kind of insulator resistance detecting circuit based on WiFi radio communication |
| CN105301390A (en) * | 2015-10-16 | 2016-02-03 | 暨南大学 | Wireless insulation monitoring device and monitoring method thereof |
| CN207232239U (en) * | 2017-09-28 | 2018-04-13 | 哈尔滨理工大学 | Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage |
-
2017
- 2017-09-28 CN CN201710898193.0A patent/CN107515326A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005181148A (en) * | 2003-12-19 | 2005-07-07 | Midori Anzen Co Ltd | Insulation monitoring device |
| CN101713810A (en) * | 2009-12-23 | 2010-05-26 | 西安交通大学 | Test unit for monitoring oil-paper insulation state |
| CN104133165A (en) * | 2014-07-07 | 2014-11-05 | 广东电网公司电力科学研究院 | Transformer oilpaper insulation test system |
| CN204347138U (en) * | 2014-12-26 | 2015-05-20 | 华北电力大学 | A kind of insulator resistance detecting circuit based on WiFi radio communication |
| CN105301390A (en) * | 2015-10-16 | 2016-02-03 | 暨南大学 | Wireless insulation monitoring device and monitoring method thereof |
| CN207232239U (en) * | 2017-09-28 | 2018-04-13 | 哈尔滨理工大学 | Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252962A (en) * | 2021-05-13 | 2021-08-13 | 国网黑龙江省电力有限公司电力科学研究院 | Wireless detection device for current of insulation sample under direct-current high voltage of converter transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110286319B (en) | One-time and two-time complete column switch integrated test method | |
| CN207051383U (en) | A kind of intelligent apparatus for avoiding electricity fraudulent | |
| CN106324406B (en) | A kind of transformer DC magnetic bias method for diagnosing faults and device | |
| CN110412454B (en) | Primary and secondary complete switch closed-loop test method | |
| CN203572883U (en) | Novel intelligent frequency-conversion large-current grounding impedance measuring instrument | |
| CN101299385A (en) | Electron type current transformer for ultrahigh voltage transmission lines and corona loss measurement device thereof | |
| CN102680862A (en) | Device and method for online monitoring of partial discharge of shunt capacitor | |
| CN107144732B (en) | User-side harmonic source localization method based on lumped power | |
| CN203799008U (en) | Pillar type electronic current transformer primary vibration test data acquisition device | |
| CN103513154A (en) | Power distribution network electric leakage signal on-line detection device | |
| CN207232239U (en) | Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage | |
| CN105866592B (en) | Dynamic passive compensation response wave shape acquisition system and acquisition method | |
| CN102937698A (en) | Single event effect detection system and detection method of DC/DC (Direct Current/Direct Current) converter | |
| CN106707028A (en) | Transformer short-circuit impedance on-line monitoring method and device | |
| CN107515326A (en) | Insulate specimen current wireless detection device under a kind of converter power transformer high direct voltage | |
| CN203606470U (en) | Asynchronous time live-line measuring device for circuit breaker | |
| CN205920157U (en) | Transformer core earth current detection device of many mutual -inductors | |
| CN106154152A (en) | A kind of circuit breaker short circuit test device of DC traction power-supply system | |
| CN205229398U (en) | Partial discharge data acquisition circuit and detecting system | |
| CN207689592U (en) | A kind of lightning arrester monitor with impact current for measuring | |
| CN105353287A (en) | Partial discharge data acquisition circuit and apparatus | |
| CN202548231U (en) | Detection device for substation merging unit | |
| CN201322780Y (en) | Switch machine test module | |
| CN205982558U (en) | Direct current traction power supply system's circuit breaker short circuit test device | |
| CN204333937U (en) | Detect the intellectualized detection device based on the intellectualized switchgear one-phase ground protection function of 10kV isolated neutral distribution network systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |