CN206223871U - A kind of high voltage isolator measuring contact resistance device - Google Patents
A kind of high voltage isolator measuring contact resistance device Download PDFInfo
- Publication number
- CN206223871U CN206223871U CN201621160771.8U CN201621160771U CN206223871U CN 206223871 U CN206223871 U CN 206223871U CN 201621160771 U CN201621160771 U CN 201621160771U CN 206223871 U CN206223871 U CN 206223871U
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- CN
- China
- Prior art keywords
- circuit
- contact resistance
- high voltage
- disconnecting switch
- voltage isolator
- 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.)
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Abstract
The utility model proposes a kind of high voltage isolator measuring contact resistance device, it is related to technical field of electric system protection, including input signal conditioning circuit, automatic gain control circuit, A/D converter circuit, single-chip microcomputer, telecommunication circuit and direct current controllable constant current source circuit, the input signal conditioning circuit is connected across the two ends of disconnecting switch, the direct current controllable constant current source circuit is connected to the two ends of the disconnecting switch, for the disconnecting switch provides direct current, the input signal conditioning circuit, automatic gain control circuit, A/D converter circuit and single-chip microcomputer are sequentially connected, measurement result is sent to ground control box by the single-chip microcomputer by the telecommunication circuit.High voltage isolator measuring contact resistance device of the present utility model, disconnecting switch contact resistance can be just measured in the case where not having a power failure, and continuously powered from without influence, and take time saving, laborsaving.
Description
Technical field
The utility model is related to technical field of electric system protection, especially a kind of high voltage isolator measuring contact resistance
Device.
Background technology
At present, open type is designed as conventional substation, high voltage isolator runs under natural environment for a long time, its contact more
Part is easily corroded by harmful substance, rainwater in air etc., causes loose contact, cause contact to generate heat, device damage situations such as, give
The safe and reliable operation of power system makes a big impact.Accordingly, it would be desirable to periodic measurement disconnecting switch contact resistance, finds in time
Problem is simultaneously processed, it is to avoid cause equipment to lose.
And the measurement of disconnecting switch direct current contact resistance can be carried out after generally requiring power failure, so as to be caused to continuous power supply
Influence, and it is time-consuming, laborious.If necessary to live line measurement, problems with need to be solved：1st, installation question, due to high voltage isolator
The eminence of 3~4m from the ground is typically mounted at, so to carry out live line measurement, measurement apparatus is first solved and is connected to disconnecting switch
On problem；2nd, protection problem, because disconnecting switch is powered, when the open mouth tongs for carrying measurement apparatus are toward or away from disconnecting switch
When, electrion phenomenon can be all produced, so must be protected to the four of measurement apparatus ports；3rd, powerup issue, measurement
Device is hung in disconnecting switch, is powered using battery most easy；4th, communication issue.
Utility model content
The utility model provides a kind of high voltage isolator measuring contact resistance device, just can be with the case where not having a power failure
Measurement disconnecting switch contact resistance, and in this, as whether needing the foundation of interruption maintenance.
The utility model specifically adopts the following technical scheme that realization：
A kind of high voltage isolator measuring contact resistance device, including input signal conditioning circuit, automatic growth control electricity
Road, A/D converter circuit, single-chip microcomputer, telecommunication circuit and direct current controllable constant current source circuit, the input signal conditioning circuit are connected across
The two ends of disconnecting switch, the direct current controllable constant current source circuit is connected to the two ends of the disconnecting switch, is the disconnecting switch
Direct current is provided, the input signal conditioning circuit, automatic gain control circuit, A/D converter circuit and single-chip microcomputer are sequentially connected,
Measurement result is sent to ground control box by the single-chip microcomputer by the telecommunication circuit.
Preferably, the measurement apparatus are four wiring constructions, the direct current controllable constant current source circuit is connected by open mouth tongs
The two ends of the disconnecting switch are connected on, Transient Suppression Diode is connected between four Wiring ports.
Preferably, the direct current controllable constant current source circuit uses tandem type constant-current source circuit, its internal adjustment pipe by
The FET parallel connection of multiple high currents, low on-resistance.
Preferably, the input signal conditioning circuit uses Differential Input, its internal operational amplifier selects low mistake
Tune, the AD8628 operational amplifiers of bottom temperature drift.
Preferably, the single-chip microcomputer and direct current controllable constant current source circuit are individually powered using battery.
Preferably, the battery is ferric phosphate lithium cell.
Preferably, the telecommunication circuit uses 2.4G ZigBee radio communication circuits.
A kind of high voltage isolator measuring contact resistance device that the utility model is provided, its advantage is：Not
Disconnecting switch contact resistance can be just measured in the case of power failure, is continuously powered from without influence, and take time saving, laborsaving, and
Transient Suppression Diode is connected between measurement apparatus and disconnecting switch, it is to avoid device potential difference is excessive and damages, there is provided device
Security and practicality.
Brief description of the drawings
Fig. 1 is the theory diagram of the utility model measurement apparatus；
Fig. 2 is the protection wiring diagram of the utility model measurement apparatus.
Specific embodiment
To further illustrate each embodiment, the utility model is provided with accompanying drawing.These accompanying drawings are in the utility model is disclosed
A part for appearance, it is mainly used to illustrate embodiment, and running of the associated description of specification to explain embodiment can be coordinated former
Reason.Coordinate and refer to these contents, those of ordinary skill in the art will be understood that other possible implementation methods and this practicality are new
The advantage of type.Component in figure is not necessarily to scale, and similar element numbers are conventionally used to indicate similar component.
The utility model is further illustrated in conjunction with the drawings and specific embodiments.
As shown in figure 1, a kind of high voltage isolator measuring contact resistance device that this implementation is provided, including input signal is adjusted
Reason circuit, automatic gain control circuit, A/D converter circuit, single-chip microcomputer, telecommunication circuit, direct current controllable constant current source circuit and electric power storage
Pond.The measurement apparatus of the present embodiment are connected across the two ends of disconnecting switch using four wiring constructions, i.e. input signal conditioning circuit, directly
Stream controllable constant current source circuit is connected to the two ends of disconnecting switch, wherein can use two insulating bars with open mouth tongs to send test device
Onto disconnecting switch, open mouth tongs are clipped in disconnecting switch two ends.As shown in Fig. 2 measurement apparatus be connected with each disconnecting switch four
Between individual port, a Transient Suppression Diode (TVS pipe) is connected, the potential difference of each port is limited in TVS pipe breakdown potential
In pressure, it is to avoid potential difference is excessive and damage between each port.
Direct current controllable constant current source circuit provides direct current for disconnecting switch, and constant-current source circuit needs to provide the test electricity of 100A
Stream, to meet the measurement request of micro-phm level electric resistance.Because the supply voltage that battery is provided only has 3.7V, constant current-supplying is formed,
Tandem type constant-current source circuit should be used, its internal adjustment pipe from several high currents, low on-resistance FET simultaneously
Connection.
During to the voltage sample of disconnecting switch, synchronous acquisition, sampling frequency should be realized with the alternating current for flowing through disconnecting switch
Rate need not be too high, but necessary synchronized sampling complete cycle.So, can be analyzed by the FFT (Fast Fourier Transform (FFT)) to data,
Reject influence of the alternating current to measuring.Phase-locked loop circuit preferably is added in input signal conditioning circuit, is protected from hardware
Card synchronized sampling complete cycle.Because sampled voltage amplitude very little, and device are in hyperbaric environment, electromagnetic interference is serious, electricity
Pressure sampled input signal modulate circuit should use Differential Input, and to reduce common mode disturbances, it is internal from low imbalance, Low Drift Temperature
The AD8628 of operational amplifier, such as Texas Instrument.
Because measurement apparatus are hung in disconnecting switch, so most easy using storage battery power supply.Because disconnecting switch connects
Resistance of getting an electric shock is micro-ohm level, needs larger electric current to obtain measurement voltage higher so measuring the resistance using voltammetry, with
Meet certainty of measurement requirement.This problem can well be solved using ferric phosphate lithium cell, the battery has extremely low internal resistance (
As be 1~10m Ω), the discharge-rate of 10C can be provided, be well suited for doing the power supply of measurement apparatus.Selection it is battery powered another
Reason is that disconnecting switch is in band load state, has alternating current to flow through on switch, when switch contact resistance is measured, it is necessary to use
Direct current is just avoided that influence of the alternating current to certainty of measurement.Need that a ZigBee radio communications electricity is installed in measurement apparatus
Road, realizes the data communication of device and ground control box.Measurement of correlation is carried out by ground control box control and measure device to operate, survey
Amount result passes back to ground control box by wireless communication module.
Although specifically showing and describing the utility model with reference to preferred embodiment, those skilled in the art should
This is understood, not departing from the spirit and scope of the present utility model that appended claims are limited, in form and details
On the utility model can be made a variety of changes, be protection domain of the present utility model.
Claims (7)
1. a kind of high voltage isolator measuring contact resistance device, it is characterised in that including input signal conditioning circuit, automatic increase
Benefit control circuit, A/D converter circuit, single-chip microcomputer, telecommunication circuit and direct current controllable constant current source circuit, the input signal conditioning electricity
Road is connected across the two ends of disconnecting switch, and the direct current controllable constant current source circuit is connected to the two ends of the disconnecting switch, is described
Disconnecting switch provide direct current, the input signal conditioning circuit, automatic gain control circuit, A/D converter circuit and single-chip microcomputer according to
Measurement result is sent to ground control box by secondary connection, the single-chip microcomputer by the telecommunication circuit.
2. a kind of high voltage isolator measuring contact resistance device according to claim 1, it is characterised in that：The measurement
Device is four wiring constructions, and the direct current controllable constant current source circuit is connected to the two ends of the disconnecting switch, four by open mouth tongs
Transient Suppression Diode is connected between individual Wiring port.
3. a kind of high voltage isolator measuring contact resistance device according to claim 1, it is characterised in that：The direct current
Controllable constant current source circuit uses tandem type constant-current source circuit, and its internal adjustment pipe is by multiple high currents, the field of low on-resistance
Effect pipe is in parallel.
4. a kind of high voltage isolator measuring contact resistance device according to claim 1, it is characterised in that：The input
Signal conditioning circuit uses Differential Input, and its internal operational amplifier selects low imbalance, the AD8628 operation amplifiers of bottom temperature drift
Device.
5. a kind of high voltage isolator measuring contact resistance device according to claim 1, it is characterised in that：The monolithic
Machine and direct current controllable constant current source circuit are individually powered using battery.
6. a kind of high voltage isolator measuring contact resistance device according to claim 5, it is characterised in that：The electric power storage
Pond is ferric phosphate lithium cell.
7. a kind of high voltage isolator measuring contact resistance device according to claim 1, it is characterised in that：The communication
Circuit uses 2.4G ZigBee radio communication circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621160771.8U CN206223871U (en) | 2016-11-01 | 2016-11-01 | A kind of high voltage isolator measuring contact resistance device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621160771.8U CN206223871U (en) | 2016-11-01 | 2016-11-01 | A kind of high voltage isolator measuring contact resistance device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206223871U true CN206223871U (en) | 2017-06-06 |
Family
ID=58789301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621160771.8U Expired - Fee Related CN206223871U (en) | 2016-11-01 | 2016-11-01 | A kind of high voltage isolator measuring contact resistance device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206223871U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444553A (en) * | 2019-01-07 | 2019-03-08 | 山东建筑大学 | Conductor jointer resistance measurement method and measuring system |
| CN110187186A (en) * | 2019-06-28 | 2019-08-30 | 广东电网有限责任公司 | A kind of modified segmentation circuit resistance tester |
| CN112327053A (en) * | 2019-07-19 | 2021-02-05 | 上海韧思能源科技有限公司 | Distribution lines contact impedance on-line monitoring system |
-
2016
- 2016-11-01 CN CN201621160771.8U patent/CN206223871U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444553A (en) * | 2019-01-07 | 2019-03-08 | 山东建筑大学 | Conductor jointer resistance measurement method and measuring system |
| CN110187186A (en) * | 2019-06-28 | 2019-08-30 | 广东电网有限责任公司 | A kind of modified segmentation circuit resistance tester |
| CN112327053A (en) * | 2019-07-19 | 2021-02-05 | 上海韧思能源科技有限公司 | Distribution lines contact impedance on-line monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170606 Termination date: 20191101 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |