CN205157734U - Cable pair collateral branch way earthing knife -switch deciliter state detection device - Google Patents
Cable pair collateral branch way earthing knife -switch deciliter state detection device Download PDFInfo
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- CN205157734U CN205157734U CN201520811788.4U CN201520811788U CN205157734U CN 205157734 U CN205157734 U CN 205157734U CN 201520811788 U CN201520811788 U CN 201520811788U CN 205157734 U CN205157734 U CN 205157734U
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- current transformer
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- grounding switch
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Abstract
Cable pair collateral branch way earthing knife -switch deciliter state detection device includes: signal loading current transformer, signal reception current transformer and respectively with the observing and controlling unit that signal loading current transformer and signal reception current transformer link to each other, signal loading current transformer and signal reception current transformer set up on the cable shield layer earth connection, it includes signal generator, signal processor, signal receiver and power module to observe and control the unit, signal processor respectively with signal generator and signal receiver link to each other, signal generator with signal loading current transformer links to each other, signal receiver with signal reception current transformer links to each other. The utility model discloses a pour into special current signal frequently into in series connection earthing knife -switch's electric loop, then it is whether closed according to whether have the earthing knife -switch that corresponding current signal determined in the electric loop in the electric loop, safe and reliable.
Description
Technical field
The utility model relates to a kind of grounding switch deciliter condition checkout gear, particularly relates to a kind of cable pair collateral road grounding switch deciliter condition checkout gear.
Background technology
Current power distribution network, after line maintenance is complete, power on before, need to confirm deciliter state of grounding switch, comprise the grounding switch of the local grounding switch of cable of switch cubicle and the offside branch road of cable.In prior art, a deciliter state for the grounding switch on the collateral road of cable pair and the grounding switch of switch cubicle carries out feedback acknowledgment by signals such as GPRS/CDMA, or manually go offside far-end to confirm, but these solutions otherwise reliability bad, or to waste time and energy.
Utility model content
The purpose of this utility model is to provide a kind of cable pair collateral road grounding switch deciliter condition checkout gear that can improve Supply Security and reliability.
To achieve these goals, the utility model takes following technical solution:
Cable pair collateral road grounding switch deciliter condition checkout gear, comprising: signal loading current transformer, Signal reception current transformer and the measurement and control unit be connected with Signal reception current transformer with described signal loading current transformer respectively; Described signal loading current transformer and Signal reception current transformer are arranged on cable shielding layer earthing line; Described measurement and control unit comprises signal generator, signal processor, signal receiver and power module, described signal processor is connected with signal receiver with described signal generator respectively, described signal generator is connected with described signal loading current transformer, and described signal receiver is connected with described Signal reception current transformer.
Signal loading current transformer of the present utility model is pincerlike straight-through current transformer.
Signal reception current transformer of the present utility model is pincerlike straight-through current transformer.
Measurement and control unit of the present utility model also comprises the display module and load module that are connected with described signal processor.
Signal generating circuit of the present utility model is AC constant-current source circuit for generating.
Signal generating circuit of the present utility model comprises the digital to analog converter and controlled constant-current source circuit that are connected successively, and described controlled constant-current source circuit is connected with described signal loading current transformer, and described digital to analog converter is connected with signal processor.
AC constant-current source circuit for generating of the present utility model is the AC constant-current source of 23Hz.
Signal receiving circuit of the present utility model comprises the analog to digital converter, low-pass filter and the prime amplifier that are connected successively, and described prime amplifier is connected with described Signal reception current transformer, and described analog to digital converter is connected with signal processor.
From above technical scheme, the utility model is at cable shielding layer earthing line signalization loading current mutual inductor and Signal reception current transformer, special current signal is frequently injected in the electric loop that cable and cable screen layer are formed, then the current value in measure loop, to carry out deciliter situation of indirect judgement cable pair collateral way switch cabinet grounding switch with or without the current value of expection, the loop that cable screen layer and cable conductor are formed defines the path exchanging constant current signal and flow through, detecting distance is far away, reliability is high, practical, effectively can prevent the generation of manual operation accident.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment, simple introduction is done below by the accompanying drawing used required in embodiment or description of the prior art, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the utility model embodiment.
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
Embodiment
Switch cubicle carries out generating electricity in electric system, transmits electricity, in the process of distribution and electric energy conversion, carries out folding, control and protection consumer.Parts in switch cubicle mainly contain the compositions such as isolating switch, disconnector, on-load switch, operating mechanism, mutual inductor and various protective devices.In order to prevent maloperation, when switch cubicle cable has grounding switch to close, comprise the grounding switch of local cable and offside grounding disconnecting link when closing, can not the switch of Closing Switch cabinet.
The cable two ends that distribution uses are connected with switch cubicle, and the cable shield of cable is two ends difference ground connection.Generally the switch cubicle of any for cable one end is called this locality, relative, the other end switch cubicle of cable becomes offside, offside grounding switch is connected between cable and switch-cabinet grounding line, and the shielding layer grounding layer of cable the same side and grounding switch are all connected on the grounding copper bar of the same side.
Cable 1 of the present utility model is connected to switch cubicle and the sheathed shielded cable of cable shield ground connection respectively at two ends for two ends that distribution uses, as shown in Figure 1, cable pair side joint ground of the present utility model disconnecting link opening and closing condition checkout gear comprises signal loading current transformer 6, Signal reception current transformer 7 and measurement and control unit 21, signal loading current transformer 6 and Signal reception current transformer 7 are arranged on cable shielding layer earthing line 5, cable shielding layer earthing layer 5 and grounding switch 4 are all connected on the copper bar 8 of the same side, copper bar 8 ground connection.Offside grounding switch 2 is connected between cable 1 and switch-cabinet grounding line 3.Signal loading current transformer 6 and the Signal reception current transformer 7 of the present embodiment are pincerlike straight-through current transformer, adopt pincerlike straight-through current transformer clamping simple, can not have an impact to the electrical integrity of switch cubicle and cable.
The power module 20 that measurement and control unit 21 comprises signal generator 13, signal processor 14, signal receiver 18, display module 19, load module 10 and powers for aforementioned components, signal processor 14 is connected with signal generator 13, signal receiver 18, display module 19 and load module 10, signal generator 13 is connected with signal loading current transformer 6, and signal receiver 18 is connected with Signal reception current transformer 7.The signal processor of the present embodiment is STM32 flush bonding processor, and this processor interface is perfect, and circuit is reliable, and display module 19 is LCDs, and load module 10 is function setting button.Power module can adopt 220V50Hz alternating current and accumulator complementation to power.
The signal generator 13 of the present embodiment is AC constant-current source circuit for generating, it comprises the digital to analog converter 11 and controlled constant-current source circuit 12 that connect successively, wherein digital to analog converter 11 is connected with signal processor 14, and controlled constant-current source circuit 12 is connected with signal loading current transformer 6.In the present embodiment, AC constant-current source circuit for generating is the AC constant-current source of 23Hz, and current effective value is 40mA, and low-frequency ac constant current signal to have in metallic conductor long transmission distance, it is little to decay, the signal of low frequency 23Hz, by low-pass filter filtering 50Hz and above undesired signal, is convenient to identify.
Signal receiver 18 comprises the analog to digital converter 15, low-pass filter 16 and the prime amplifier 17 that connect successively, and analog to digital converter 15 is connected with signal processor 14, and prime amplifier 17 is connected with Signal reception current transformer 7.
Below the course of work of the present utility model is described in detail:
Signal processor 14 control signal generator 13 produces the interchange constant current signal of 23Hz;
Signal loading current transformer 6 the signal loading of 23Hz on cable shielding layer earthing line 5;
Signal reception current transformer 7 receives the signal on cable shielding layer earthing line 5;
The signal that signal receiver 18 Received signal strength received current mutual inductor 7 transmits also sends into signal processor 14 after amplification, low-pass filtering and digital-to-analog conversion process, signal processor 14 judges deciliter state of current cable pair collateral road grounding switch according to the effective value receiving the frequency of signal, waveform and alternating current, and by judgment result displays in LCDs.
Cable screen layer, cable conductor and local and offside grounding disconnecting link can form electric loop, after local grounding switch closes a floodgate, offside branch road has grounding switch to close, closed-loop path can be formed, signal loading current transformer is to loading current signal in loop, signal processor is according to the effective value of Received signal strength, deciliter state of frequency and waveform instruction offside grounding disconnecting link: when the whole separating brake of grounding switch of offside branch road, the Received signal strength effective value calculated is less than 90% of normal value, frequency values skew is greater than 5Hz, waveform and sinusoidal wave correlativity are less than 50% (need meet simultaneously) at above 3, when the grounding switch of offside branch road has combined floodgate, the Received signal strength effective value calculated is not less than 90% of normal value, frequency values skew is not more than 3Hz, waveform and sinusoidal wave correlativity are not less than 95% (need meet simultaneously) at above 3, according to these numerical value, electrical connection situation can be judged and make corresponding instruction.
The utility model can be widely used in the fields such as distribution switch-cabinet grounding knife-switch detection, particularly the grounding switch detection of cable pair collateral road.Signal processor calculates the setting value of normal value, with deciliter state of the grounding switch of this setting value automatic decision offside branch road, without the need to manual intervention according to the maximum offside branch road distance of setting.Electronic component in the utility model and integrated circuit can adopt conventional device, and current transformer can adopt existing product or similar sensor in ring main unit.
Compared with prior art, the utility model has the following advantages:
(1) the utility model adopts and inject special current signal frequently in the electric loop of series connection grounding switch, then judges whether the grounding switch in electric loop closes, and Scheme Security is reliable according to whether having corresponding current signal in electric loop;
(2) in the electric loop that the utility model is formed at cable conductor and cable shield and grounding switch, inject special signal frequently, the impact that the selection of electric loop avoids distributed capacitance between cable conductor and ground shield, the instability avoiding because the earth being increased electric loop as loop, and electric loop is entirely for metal connects, electric property is stable, reliability is high;
(3) the utility model is in electric loop, and the signal of injection is that low frequency 23Hz exchanges constant current signal, and decay when low-frequency current signal transmits on plain conductor little, long transmission distance, can realize remote detection;
(4) the utility model detects the multiple dimensions collecting signal in electric loop, current effective value, frequency and oscillogram, ensures testing result correctness and reliability;
(5) the utility model adopts two split core type current transformers respectively as the sensor of load signal and collection signal, does not destroy the electrical integrity of switch cubicle and cable, easy to use.
Above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although be described in detail the utility model with reference to above-described embodiment, those of ordinary skill in the field are to be understood that, still can modify to embodiment of the present utility model or equivalent replacement, and not departing from any amendment of the utility model spirit and scope or equivalent replacement, it all should be encompassed among right of the present utility model.
Claims (8)
1. cable pair collateral road grounding switch deciliter condition checkout gear, is characterized in that, comprising:
Signal loading current transformer, Signal reception current transformer and the measurement and control unit be connected with Signal reception current transformer with described signal loading current transformer respectively;
Described signal loading current transformer and Signal reception current transformer are arranged on cable shielding layer earthing line;
Described measurement and control unit comprises signal generator, signal processor, signal receiver and power module, described signal processor is connected with signal receiver with described signal generator respectively, described signal generator is connected with described signal loading current transformer, and described signal receiver is connected with described Signal reception current transformer.
2. the collateral road of cable pair as claimed in claim 1 grounding switch deciliter condition checkout gear, is characterized in that: described signal loading current transformer is pincerlike straight-through current transformer.
3. the collateral road of cable pair as claimed in claim 1 or 2 grounding switch deciliter condition checkout gear, is characterized in that: described Signal reception current transformer is pincerlike straight-through current transformer.
4. the collateral road of cable pair as claimed in claim 1 grounding switch deciliter condition checkout gear, is characterized in that: described measurement and control unit also comprises the display module and load module that are connected with described signal processor.
5. the collateral road of cable pair as claimed in claim 1 grounding switch deciliter condition checkout gear, is characterized in that: described signal generating circuit is AC constant-current source circuit for generating.
6. the collateral road of cable pair as claimed in claim 5 grounding switch deciliter condition checkout gear, it is characterized in that: described signal generating circuit comprises the digital to analog converter and controlled constant-current source circuit that are connected successively, described controlled constant-current source circuit is connected with described signal loading current transformer, and described digital to analog converter is connected with signal processor.
7. the collateral road of cable pair as claimed in claim 5 grounding switch deciliter condition checkout gear, is characterized in that: described AC constant-current source circuit for generating is the AC constant-current source of 23Hz.
8. the collateral road of cable pair as claimed in claim 1 grounding switch deciliter condition checkout gear, it is characterized in that: described signal receiving circuit comprises the analog to digital converter, low-pass filter and the prime amplifier that are connected successively, described prime amplifier is connected with described Signal reception current transformer, and described analog to digital converter is connected with signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520811788.4U CN205157734U (en) | 2015-10-19 | 2015-10-19 | Cable pair collateral branch way earthing knife -switch deciliter state detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520811788.4U CN205157734U (en) | 2015-10-19 | 2015-10-19 | Cable pair collateral branch way earthing knife -switch deciliter state detection device |
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| CN205157734U true CN205157734U (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520811788.4U Expired - Fee Related CN205157734U (en) | 2015-10-19 | 2015-10-19 | Cable pair collateral branch way earthing knife -switch deciliter state detection device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123031A (en) * | 2019-12-18 | 2020-05-08 | 国网湖北省电力有限公司宜昌供电公司 | Fault detection method, low-voltage energy storage pre-operation set device, controller and system |
| CN111208420A (en) * | 2020-02-26 | 2020-05-29 | 南京南瑞继保电气有限公司 | Generator grounding switch state detection method and system based on signal injection |
| CN112630634A (en) * | 2020-11-13 | 2021-04-09 | 深圳供电局有限公司 | Switching operation characteristic measuring device and method |
| CN112821265A (en) * | 2020-12-31 | 2021-05-18 | 广东电网有限责任公司 | Method and device for automatically shielding and de-shielding signal for overhauling electrical equipment |
-
2015
- 2015-10-19 CN CN201520811788.4U patent/CN205157734U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111123031A (en) * | 2019-12-18 | 2020-05-08 | 国网湖北省电力有限公司宜昌供电公司 | Fault detection method, low-voltage energy storage pre-operation set device, controller and system |
| CN111208420A (en) * | 2020-02-26 | 2020-05-29 | 南京南瑞继保电气有限公司 | Generator grounding switch state detection method and system based on signal injection |
| CN111208420B (en) * | 2020-02-26 | 2022-02-18 | 南京南瑞继保电气有限公司 | Generator grounding switch state detection method and system based on signal injection |
| CN112630634A (en) * | 2020-11-13 | 2021-04-09 | 深圳供电局有限公司 | Switching operation characteristic measuring device and method |
| CN112630634B (en) * | 2020-11-13 | 2023-03-03 | 深圳供电局有限公司 | Switching operation characteristic measuring device and method |
| CN112821265A (en) * | 2020-12-31 | 2021-05-18 | 广东电网有限责任公司 | Method and device for automatically shielding and de-shielding signal for overhauling electrical equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160413 Termination date: 20161019 |
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| CF01 | Termination of patent right due to non-payment of annual fee |