CN105572489A - Live-line tester for lightning arrester - Google Patents
Live-line tester for lightning arrester Download PDFInfo
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- CN105572489A CN105572489A CN201410541089.2A CN201410541089A CN105572489A CN 105572489 A CN105572489 A CN 105572489A CN 201410541089 A CN201410541089 A CN 201410541089A CN 105572489 A CN105572489 A CN 105572489A
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- voltage
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- lightning arrester
- live
- current
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- 238000012360 testing method Methods 0.000 claims abstract description 21
- 230000003750 conditioning effect Effects 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000032683 aging Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention relates to a live-line tester for a lightning arrester, wherein the live-line tester is used for live testing of a lightning arrester of an intelligent transformer station. The live-line tester is connected with a lightning arrester that needs to be tested and has the 220-V power voltage in the transformer station. A voltage phase compensation module is embedded into the live-line tester. A signal collection system of the voltage phase compensation module collects a voltage signal of 220-V voltage and a current signal of the transformer station and inputs the signals into a signal conditioning system. The signal conditioning system enables the collected 220-V voltage signal and current signal to be processed by voltage compensation by a connected high-voltage coil and low-voltage coil and thus the voltage and current signals are compensated by the obtained phase consistent with the bus voltage; and the signals pass through a current sensor, an operational amplifier, a resistor, a capacitor, and an AD converter and are connected with a single-chip microcomputer. According to the invention, for live detection work of the lightning arrester, the PT voltage is not collected directly on the premise that detection reliability is ensured; and the accurate phase of the PT voltage is obtained by the 220-V voltage in the station. Therefore, the live testing work efficiency of the lightning arrester and the field equipment security operation stability are improved.
Description
Technical field
The present invention relates to power equipment application tool technical field, specifically a kind of testing instrument for electrified for intelligent substation lightning arrester.
Background technology
Lightning arrester is as one of important equipment of electric system; its effect is used to protect the equipment that in electric system, various electric equipment impacts from lightning surge, switching overvoltage, Frequency Transient Overvoltage and damages; be directly connected to the safe and stable operation of electric system; if make moist aging and be not found, the impact so caused electrical network and loss are huge.So lightning arrester test is conventional test in preventive trial code.But intelligent substation PT secondary side voltage cannot gather.
Metal oxide arrester (hereinafter referred to as MOA) is the widely used overvoltage protective device of current electric system.MOA operational factor can simplify the parallel circuit being equivalent to a variable resistor and a constant electric capacity.MOA is under working voltage effect, and its ZnO resistors sector-meeting is aging gradually, or makes moist due to seal failure, causes current in resistance property to increase, and therefore by measuring the change of MOA current in resistance property, just can understand the operation conditions of MOA.
Current most of MOA testing current in resistance property instrument all extensively adopts PT secondary side voltage signal phase place to measure the phase differential with current signal as benchmark, judge the quality of lightning arrester according to the phase condition of the two, visible accurate acquisition voltage signal becomes the key point that instrument is accurately measured.But the collection of on-the-spot PT secondary side voltage often has difficulties: collection in worksite PT voltage increases the risk of PT secondary circuit short-circuit.There is shelter in the middle of between the lightning arrester of some substation field and PT or do not allow directly to gather from PT side, causing voltage to obtain.
Summary of the invention
For overcoming the deficiencies in the prior art, goal of the invention of the present invention is to provide a kind of lightning arrester with electrical testing meter, make 220V supply voltage acquired in transformer station as reference voltage, with busbar voltage and PT secondary side voltage in phase, to solve the voltage-phase acquisition problems of lightning arrester live-line test.
For achieving the above object, testing instrument for electrified of the present invention is connected with 220V supply voltage in transformer station, the lightning arrester that need test respectively; Testing instrument for electrified is embedded in voltage-phase compensating module;
The signal acquiring system of described voltage-phase compensating module gathers voltage signal and the current signal of transformer station 220V voltage, input signal conditioning system.
Described signal condition system by the 220V voltage signal collected with current signal after being connected high-tension coil, low-voltage coil voltage compensation, obtain the phase compensation voltage consistent with busbar voltage and current signal, be connected with single-chip microcomputer through over-current sensor, operational amplifier, resistance, electric capacity, AD conversion.
The present invention adopts 220V supply voltage in station to make reference voltage.But there is a fixed phase drift between reference voltage and busbar voltage, electric pressure this phase shift higher is larger, and its reason is often have certain change through its output voltage phase place of stage transformer.The transformer progression of process is more, and phase shift is larger.
The present invention is by voltage compensator and software compensation algorithm, the 220V voltage collected is obtained the phase place consistent with busbar voltage after voltage compensation module, through signal condition system, deliver to single-chip microcomputer and calculate phase differential, application trigonometric function, can current in resistance property be calculated according to total current, and then understand the operation conditions of MOA.
Under the present invention makes the live detection of lightning arrester be operated in the prerequisite ensureing detecting reliability, directly do not gather PT voltage, obtained the accurate phase of PT voltage by interior 220V voltage of standing, drastically increase the work efficiency of lightning arrester live-line test and the stability of field apparatus safe operation.
Accompanying drawing explanation
Fig. 1 is the overall hardware block diagram of instrument.
Fig. 2 is wiring diagram of the present invention.
Embodiment
As shown in Figure 1 and Figure 2, testing instrument for electrified 13 is connected with 220V supply voltage in transformer station, the lightning arrester 14 that need test respectively; Testing instrument for electrified 13 is embedded in voltage-phase compensating module 15; The signal acquiring system 2 of described voltage-phase compensating module 15 gathers voltage signal V and the current signal Ix of transformer station 220V voltage, input signal conditioning system.
For obtaining voltage accurate phase, devise voltage compensator and software compensation algorithm.Substation bus bar high pressure through high-tension coil 3,4, main-transformer and a series of decompression device such as station local coordinate frame, low-voltage coil 5,6, obtain 220V voltage, the advanced busbar voltage certain angle of this voltage-phase (for 60 degree).If 220V voltage delay 60 degree (or advanced 300 degree) in station, then obtain new voltage and busbar voltage and PT secondary side voltage in phase, solve voltage-phase acquisition problems.
Signal condition system by the 220V voltage signal that collects and current signal through high-tension coil 3,4, main-transformer and station local coordinate frame, after low-voltage coil 5,6 voltage compensation, obtain the phase compensation voltage consistent with busbar voltage and current signal, be connected with single-chip microcomputer 12 through over-current sensor 7, operational amplifier 8, resistance 9, electric capacity 10, AD conversion 11; Regulated and controled by single-chip microcomputer 12, calculate phase differential, application trigonometric function, can calculate current in resistance property according to total current.By instrument operations, draw required data.
Claims (2)
1. a lightning arrester with electrical testing meter, is characterized in that: testing instrument for electrified (13) is connected with 220V supply voltage in transformer station, the lightning arrester (14) that need test respectively; Testing instrument for electrified (13) is embedded in voltage-phase compensating module (15);
The signal acquiring system (2) of described voltage-phase compensating module (15) gathers voltage signal and the current signal of transformer station 220V voltage, input signal conditioning system.
2. lightning arrester with electrical testing meter according to claim 1, it is characterized in that: described signal condition system (2) by the 220V voltage signal collected with current signal after being connected high-tension coil, low-voltage coil voltage compensation, obtain the phase compensation voltage consistent with busbar voltage and current signal, be connected with single-chip microcomputer (12) through over-current sensor (7), operational amplifier (8), resistance (9), electric capacity (10), AD conversion (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410541089.2A CN105572489A (en) | 2014-10-14 | 2014-10-14 | Live-line tester for lightning arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410541089.2A CN105572489A (en) | 2014-10-14 | 2014-10-14 | Live-line tester for lightning arrester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105572489A true CN105572489A (en) | 2016-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410541089.2A Pending CN105572489A (en) | 2014-10-14 | 2014-10-14 | Live-line tester for lightning arrester |
Country Status (1)
| Country | Link |
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| CN (1) | CN105572489A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044830A (en) * | 2019-12-31 | 2020-04-21 | 苏州华电电气股份有限公司 | Zinc oxide arrester operating characteristic live monitoring device |
| CN112578309A (en) * | 2020-10-29 | 2021-03-30 | 深圳供电局有限公司 | Method and device for acquiring voltage reference signal of lightning arrester live test |
-
2014
- 2014-10-14 CN CN201410541089.2A patent/CN105572489A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111044830A (en) * | 2019-12-31 | 2020-04-21 | 苏州华电电气股份有限公司 | Zinc oxide arrester operating characteristic live monitoring device |
| CN112578309A (en) * | 2020-10-29 | 2021-03-30 | 深圳供电局有限公司 | Method and device for acquiring voltage reference signal of lightning arrester live test |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160511 |
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| WD01 | Invention patent application deemed withdrawn after publication |