CN203705545U - Harmonic wave measuring circuit and electric energy testing device - Google Patents
Harmonic wave measuring circuit and electric energy testing device Download PDFInfo
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- CN203705545U CN203705545U CN201320693180.7U CN201320693180U CN203705545U CN 203705545 U CN203705545 U CN 203705545U CN 201320693180 U CN201320693180 U CN 201320693180U CN 203705545 U CN203705545 U CN 203705545U
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- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 230000001419 dependent effect Effects 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 abstract 3
- 208000033999 Device damage Diseases 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 238000012544 monitoring process Methods 0.000 description 8
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004821 Contact adhesive Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
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Abstract
The utility model discloses a harmonic wave measuring circuit and an electric energy testing device. The harmonic wave measuring circuit comprises a measurement protection circuit, and an open-circuit protection circuit which is parallelly connected with the measurement protection circuit, and used for shorting out the measurement protection circuit in the condition when the loop of the harmonic wave measuring circuit is disconnected. With the harmonic wave measuring circuit and the electric energy testing device, the technical problem of unsafe operation due to grid instability caused by device damages owning to CT loop open circuit is solved, and harmonic wave detection is carried out safely and stably for an electrical system.
Description
Technical field
The utility model relates to power test field, in particular to a kind of harmonic measure circuit and power test device.
Background technology
Along with the development of electric system, more and more higher to the requirement of the quality of power supply, carry out all existing in harmonic wave test the danger of CT (current transformer) open circuit at every turn.In the time that current transformer is opened a way; impedance infinitely increases; secondary current equals zero; secondary magnetizing force equals zero, and total magnetization power equals primary winding magnetizing force, and namely primary current has become exciting curent completely; produce very high electromotive force at secondary coil; its peak value can reach several kilovolts, threatens personal safety, or causes instrument, protective device, mutual inductor secondary to damage.Under existence conditions, only have the fastening CT open circuit of just preventing in CT loop, and fastening unstable and cost is very high to CT loop in prior art, if occur in test process, open circuit consequence is very serious.Existingly in harmonic wave test process, need to monitor twenty four hours, after open circuit occurs CT, staff can not process in time, and the stabilization of power grids, reliability service are caused to great harm.
For above-mentioned problem, effective solution is not yet proposed at present.
Utility model content
The utility model embodiment provides a kind of harmonic measure circuit and power test device, at least to solve the equipment of CT loop open circuit infringement transformer station, causes electrical network unstable, technical matters that can not safe operation.
According to the utility model embodiment aspect, a kind of harmonic measure circuit is provided, comprising: measuring and protecting circuit; Open loop protection circuit, in parallel with measuring and protecting circuit, in the case of the loop of harmonic measure circuit disconnects by measuring and protecting short circuit.
Further, harmonic measure circuit also comprises: Current Mutual Inductance circuit; Control circuit, is connected between Current Mutual Inductance circuit and measuring and protecting circuit, and wherein, Current Mutual Inductance circuit, measuring and protecting circuit and control circuit form the loop of harmonic measure circuit; Open loop protection circuit is connected between control circuit and Current Mutual Inductance circuit, and open loop protection circuit is used for the in the situation that of Current Mutual Inductance open circuit by metering circuit short circuit, to be communicated with the loop of harmonic measure circuit.
Further, open loop protection circuit comprises: voltage dependent resistor (VDR), is connected with Current Mutual Inductance circuit; Voltage transformer (VT), is connected between voltage dependent resistor (VDR) and control circuit; Guard relay, is connected between control circuit and voltage transformer (VT).
Further, the first end of voltage dependent resistor (VDR) is connected with Current Mutual Inductance circuit; The first end of the first winding of voltage transformer (VT) is connected with the second end of voltage dependent resistor (VDR), and the second end of the first winding is connected with the ground wire of control circuit; The first end of the second winding and the first end of guard relay of voltage transformer (VT) are connected, and the second end of the second winding is connected with the second end of guard relay; The contact of guard relay is connected with the A phase of control circuit, the B phase of control circuit and the C of control circuit respectively.
Further, guard relay comprises the first sub-contact, the second sub-contact, the 3rd sub-contact, and wherein, the first sub-contact is connected on the cable of A phase of control circuit; The second sub-contact is connected on the cable of B phase of control circuit; The 3rd sub-contact is connected on the cable of C phase of control circuit.
Further, the second end of the first winding is connected with the A phase of control circuit, the B phase of control circuit and the C of control circuit respectively.
Further, Current Mutual Inductance circuit, control circuit and open loop protection circuit connect by cable.
According to the utility model embodiment on the other hand, also provide a kind of power test device, having comprised: harmonic measure circuit.
In the utility model embodiment, use open loop protection circuit in the situation that measuring circuit is opened a way measuring and protecting short circuit, thereby can be in the situation that metering circuit be opened a way, still measuring circuit is communicated with, thereby avoid the Current Transformer Secondary coil in measuring circuit to produce very high electromotive force, thereby the electron device in can protection loop and the power equipment in electric system, solve the equipment of CT loop open circuit infringement transformer station in prior art, cause electrical network unstable, technical matters that can not safe operation, realize and with security and stability electric system is carried out to harmonic wave testing process, and the risk of having avoided the rear monitoring personnel of on-the-spot generation CT open circuit not dispose in time, greatly improve the security of monitoring.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is according to the structural representation of the harmonic measure circuit of the utility model embodiment; And
Fig. 2 is according to the structural representation of harmonic measure circuit embodiment illustrated in fig. 1.
Embodiment
In order to make those skilled in the art person understand better the utility model scheme, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the embodiment of the utility model part, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all should belong to the scope of the utility model protection.
It should be noted that, term " first ", " second " etc. in instructions of the present utility model and claims and above-mentioned accompanying drawing are for distinguishing similar object, and needn't be used for describing specific order or precedence.The data that should be appreciated that such use suitably can exchanged in situation, so as embodiment of the present utility model described herein can with except diagram here or describe those order enforcement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, for example, those steps or unit that process, method, system, product or the equipment that has comprised series of steps or unit is not necessarily limited to clearly list, but can comprise clearly do not list or for these processes, method, product or equipment intrinsic other step or unit.
Fig. 1 is according to the structural representation of the harmonic measure circuit of the utility model embodiment.As shown in Figure 1, this circuit can comprise: measuring and protecting circuit 10; Open loop protection circuit 30, in parallel with measuring and protecting circuit 10, in the case of the loop 70 of harmonic measure circuit disconnects by measuring and protecting short circuit.
Adopt the utility model, use open loop protection circuit in the situation that measuring circuit is opened a way measuring and protecting short circuit, thereby can be in the situation that metering circuit be opened a way, still measuring circuit is communicated with, thereby avoid the Current Transformer Secondary coil in measuring circuit to produce very high electromotive force, thereby the electron device in can protection loop and the power equipment in electric system, solve the equipment of CT loop open circuit infringement transformer station in prior art, cause electrical network unstable, technical matters that can not safe operation, realize and with security and stability electric system is carried out to harmonic wave testing process, and the risk of having avoided the rear monitoring personnel of on-the-spot generation CT open circuit not dispose in time, greatly improve the security of monitoring.
In above-described embodiment of the present utility model, harmonic measure circuit can also comprise: Current Mutual Inductance circuit; Control circuit 50, is connected between Current Mutual Inductance circuit and measuring and protecting circuit 10, and wherein, Current Mutual Inductance circuit, measuring and protecting circuit 10 and control circuit form the loop of harmonic measure circuit; Open loop protection circuit 30 is connected between control circuit 50 and Current Mutual Inductance circuit, and open loop protection circuit is used for the in the situation that of Current Mutual Inductance open circuit by metering circuit short circuit, to be communicated with the loop of harmonic measure circuit.
In above-described embodiment of the present utility model, as shown in Figure 2, open loop protection circuit 30 can comprise: voltage dependent resistor (VDR) R, is connected with Current Mutual Inductance circuit; Voltage transformer (VT), is connected between voltage dependent resistor (VDR) and control circuit 50; Guard relay K, is connected between control circuit 50 and voltage transformer (VT).
Particularly, the first end of voltage dependent resistor (VDR) is connected with Current Mutual Inductance circuit; The first end of the first winding of voltage transformer (VT) is connected with the second end of voltage dependent resistor (VDR), and the second end of the first winding is connected with the ground wire of control circuit; The first end of the second winding and the first end of guard relay of voltage transformer (VT) are connected, and the second end of the second winding is connected with the second end of guard relay; The contact of guard relay is connected with the A phase of control circuit, the B phase of control circuit and the C of control circuit respectively.
As shown in Figure 2, raise and exceed normal working voltage and select the voltage breakdown of voltage dependent resistor (VDR) by voltage after CT (being the Current Mutual Inductance circuit in above-described embodiment) open circuit, voltage dependent resistor (VDR) punctures rear guard relay and starts working, carry out the startup of guard relay by electromagnetic induction original paper, in said process, all can carry out transmission voltage by test wire, then carry out the connection in CT loop by guard relay.N shown in Fig. 2 is ground wire mutually.
More specifically, the guard relay shown in Fig. 2 can comprise the first sub-contact, the second sub-contact, the 3rd sub-contact, and wherein, the first sub-contact is connected on the cable of A phase of control circuit; The second sub-contact is connected on the cable of B phase of control circuit; The 3rd sub-contact is connected on the cable of C phase of control circuit.Wherein, does not point out in Fig. 2 contact.
The second end of the first winding in above-described embodiment is connected with the A phase of control circuit, the B phase of control circuit and the C of control circuit respectively.
Wherein, Current Mutual Inductance circuit, control circuit 50 and open loop protection circuit 30 connect by cable.
The utility model also provides a kind of power test device, and this device can comprise: any one harmonic measure circuit in above-described embodiment.
Adopt the utility model, use open loop protection circuit in harmonic measure circuit in the situation that measuring circuit is opened a way measuring and protecting short circuit, thereby can be in the situation that metering circuit be opened a way, still measuring circuit is communicated with, thereby avoid the Current Transformer Secondary coil in measuring circuit to produce very high electromotive force, thereby the electron device in can protection loop and the power equipment in electric system, solve the equipment of CT loop open circuit infringement transformer station in prior art, cause electrical network unstable, technical matters that can not safe operation, realize and with security and stability electric system is carried out to harmonic wave testing process, and the risk of having avoided the rear monitoring personnel of on-the-spot generation CT open circuit not dispose in time, greatly improve the security of monitoring.
In the utility model embodiment as shown in Figure 2, under power test device normal operation, normal working voltage is very little, and voltage dependent resistor (VDR) can not start; After CT open circuit, impedance infinitely increases, and secondary current equals zero, and will produce very high electromotive force at secondary coil, and terminal row CT side is adopted very high voltage, and voltage dependent resistor (VDR) starts, and starts contact adhesive, CT circuit communication by electromagnetic induction guard relay.
From above description, can find out, the utility model has been realized following technique effect: adopt the utility model, use open loop protection circuit in the situation that measuring circuit is opened a way measuring and protecting short circuit, thereby can be in the situation that metering circuit be opened a way, still measuring circuit is communicated with, thereby avoid the Current Transformer Secondary coil in measuring circuit to produce very high electromotive force, thereby the electron device in can protection loop and the power equipment in electric system, solve the equipment of CT loop open circuit infringement transformer station in prior art, cause electrical network unstable, technical matters that can not safe operation, realize and with security and stability electric system is carried out to harmonic wave testing process, and the risk of having avoided the rear monitoring personnel of on-the-spot generation CT open circuit not dispose in time, greatly improve the security of monitoring.
The claimed controller of the application and each assembly that forms this controller are all a kind of entity products that has definite shape, constructs and occupy certain space.For example, microprocessor, signal processor, sub-processor etc. are all can computer equipment, terminal or server independent operating, that have particular hardware structure.
In addition, the each functional unit in each embodiment of the utility model can be integrated in a processing unit, can be also that the independent physics of unit exists, and also can be integrated in a unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, and also can adopt the form of SFU software functional unit to realize.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. a harmonic measure circuit, is characterized in that, comprising:
Measuring and protecting circuit;
Open loop protection circuit, in parallel with described measuring and protecting circuit, in the case of the loop of harmonic measure circuit disconnects by described measuring and protecting short circuit;
Wherein, described harmonic measure circuit also comprises: Current Mutual Inductance circuit; Control circuit, is connected between described Current Mutual Inductance circuit and described measuring and protecting circuit, and wherein, described Current Mutual Inductance circuit, described measuring and protecting circuit and described control circuit form the loop of described harmonic measure circuit; Described open loop protection circuit is connected between described control circuit and described Current Mutual Inductance circuit, and described open loop protection circuit is used for the in the situation that of described Current Mutual Inductance open circuit by described metering circuit short circuit, to be communicated with the loop of described harmonic measure circuit;
Wherein, described open loop protection circuit comprises: voltage dependent resistor (VDR), is connected with described Current Mutual Inductance circuit; Voltage transformer (VT), is connected between described voltage dependent resistor (VDR) and described control circuit; Guard relay, is connected between described control circuit and described voltage transformer (VT);
Wherein, the first end of described voltage dependent resistor (VDR) is connected with described Current Mutual Inductance circuit; The first end of the first winding of described voltage transformer (VT) is connected with the second end of described voltage dependent resistor (VDR), and the second end of described the first winding is connected with the ground wire of described control circuit; The first end of the second winding and the first end of described guard relay of described voltage transformer (VT) are connected, and the second end of described the second winding is connected with the second end of described guard relay; The contact of described guard relay is connected with the B phase of the A phase of described control circuit, described control circuit and the C of described control circuit respectively.
2. harmonic measure circuit according to claim 1, is characterized in that, described guard relay comprises the first sub-contact, the second sub-contact, the 3rd sub-contact, wherein,
Described the first sub-contact is connected on the cable of A phase of described control circuit;
Described the second sub-contact is connected on the cable of B phase of described control circuit;
Described the 3rd sub-contact is connected on the cable of C phase of described control circuit.
3. harmonic measure circuit according to claim 1, is characterized in that, the second end of described the first winding is connected with the B phase of the A phase of described control circuit, described control circuit and the C of described control circuit respectively.
4. harmonic measure circuit according to claim 1, is characterized in that, described Current Mutual Inductance circuit, described control circuit and described open loop protection circuit connect by cable.
5. a power test device, is characterized in that, comprising: the harmonic measure circuit in claim 1 to 4 described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320693180.7U CN203705545U (en) | 2013-11-05 | 2013-11-05 | Harmonic wave measuring circuit and electric energy testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320693180.7U CN203705545U (en) | 2013-11-05 | 2013-11-05 | Harmonic wave measuring circuit and electric energy testing device |
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| Publication Number | Publication Date |
|---|---|
| CN203705545U true CN203705545U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320693180.7U Expired - Fee Related CN203705545U (en) | 2013-11-05 | 2013-11-05 | Harmonic wave measuring circuit and electric energy testing device |
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| Country | Link |
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| CN (1) | CN203705545U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614587A (en) * | 2013-11-05 | 2015-05-13 | 国家电网公司 | Harmonic measurement circuit and electric energy testing device |
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2013
- 2013-11-05 CN CN201320693180.7U patent/CN203705545U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614587A (en) * | 2013-11-05 | 2015-05-13 | 国家电网公司 | Harmonic measurement circuit and electric energy testing device |
| CN104614587B (en) * | 2013-11-05 | 2017-11-14 | 国家电网公司 | Harmonic measure circuit and power test device |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20181105 |