CN104614587A - Harmonic measurement circuit and electric energy testing device - Google Patents
Harmonic measurement circuit and electric energy testing device Download PDFInfo
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- CN104614587A CN104614587A CN201310542816.2A CN201310542816A CN104614587A CN 104614587 A CN104614587 A CN 104614587A CN 201310542816 A CN201310542816 A CN 201310542816A CN 104614587 A CN104614587 A CN 104614587A
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Abstract
The invention discloses a harmonic measurement circuit and an electric energy testing device. The harmonic measurement circuit comprises a measurement protection circuit and an open circuit protection circuit, the open circuit protection circuit is connected in parallel with the measurement protection circuit for short-circuiting the measurement protection circuit under the condition that the loop of the harmonic measurement circuit is disconnected. Through the circuit and the device, the technical problems of instability of a power grid and incapability of realizing safe operation caused by damage of equipment of a substation by open circuit of a CT (Computed Tomography) loop in the prior art are solved, and safe and stable harmonic detection of a power system is realized.
Description
Technical field
The present invention 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 there is CT(current transformer in stress_responsive genes at every turn) danger of opening a way.When 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 becomes exciting curent completely; very high electromotive force is produced at secondary coil; its peak value can reach several kilovolts, threatens personal safety, or causes instrument, protective device, mutual inductor secondary damage.Under existence conditions, only have and the fastening CT that just can prevent in CT loop is opened a way, and to the fastening instability in CT loop and cost is very high in prior art, open circuit consequence is very serious if occur in test process.Existing needs in stress_responsive genes process monitors twenty four hours, and after open circuit occurs CT, staff can not process in time, causes significant damage to the stabilization of power grids, reliability service.
For above-mentioned problem, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide a kind of harmonic measure circuit and power test device, at least to solve the equipment of CT loop open circuit infringement transformer station, cause electrical network unstable, can not the technical matters of safe operation.
According to an aspect of the embodiment of the present invention, provide a kind of harmonic measure circuit, comprising: measuring and protecting circuit; Open loop protection circuit, with measuring and protecting circuit in parallel, for when harmonic measure circuit loop disconnect 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 when 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 of voltage transformer (VT) is connected with the first end of guard relay, 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 C of the A phase of control circuit, the B phase of control circuit and 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; Second sub-contact is connected on the cable of B phase of control circuit; 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 C of the A phase of control circuit, the B phase of control circuit and control circuit respectively.
Further, Current Mutual Inductance circuit, control circuit and open loop protection circuit are connected by cable.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of power test device, comprising: harmonic measure circuit.
In embodiments of the present invention, use open loop protection circuit when measuring circuit is opened a way measuring and protecting short circuit, thus can when metering circuit is opened a way, still measuring circuit is communicated with, thus avoid the Current Transformer Secondary coil in measuring circuit to produce very high electromotive force, thus can the electron device in 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, can not the technical matters of safe operation, realize carrying out harmonic detecting process to electric system with security and stability, and avoid the on-the-spot risk rear monitoring personnel of CT open circuit occurring and can not dispose in time, drastically increase the security of monitoring.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the harmonic measure circuit according to the embodiment of the present invention; And
Fig. 2 is the structural representation according to harmonic measure circuit embodiment illustrated in fig. 1.
Embodiment
First, the part noun occurred in the process be described the embodiment of the present invention or term are applicable to description below:
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Fig. 1 is the structural representation of the harmonic measure circuit according to the embodiment of the present invention.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, for when harmonic measure circuit loop 70 disconnect by measuring and protecting short circuit.
Adopt the present invention, use open loop protection circuit when measuring circuit is opened a way measuring and protecting short circuit, thus can when metering circuit is opened a way, still measuring circuit is communicated with, thus avoid the Current Transformer Secondary coil in measuring circuit to produce very high electromotive force, thus can the electron device in 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, can not the technical matters of safe operation, realize carrying out harmonic detecting process to electric system with security and stability, and avoid the on-the-spot risk rear monitoring personnel of CT open circuit occurring and can not dispose in time, drastically increase the security of monitoring.
In the above embodiment of the present invention, 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 when Current Mutual Inductance open circuit by metering circuit short circuit, to be communicated with the loop of harmonic measure circuit.
In the above embodiment of the present invention, 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 of voltage transformer (VT) is connected with the first end of guard relay, 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 C of the A phase of control circuit, the B phase of control circuit and control circuit respectively.
As shown in Figure 2, Current Mutual Inductance circuit by CT(and above-described embodiment) open circuit after voltage raise exceed the voltage breakdown that normal operating voltage selects voltage dependent resistor (VDR), voltage dependent resistor (VDR) punctures rear guard relay and starts working, the startup of guard relay is carried out by electromagnetic induction original paper, in above process, all can carry out transmission voltage by test wire, then be carried out the connection in CT loop by guard relay.N phase shown in Fig. 2 is ground wire.
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; Second sub-contact is connected on the cable of B phase of control circuit; 3rd sub-contact is connected on the cable of C phase of control circuit.Wherein, sub-contact is not pointed out in fig. 2.
Second end of the first winding in above-described embodiment is connected with the C of the A phase of control circuit, the B phase of control circuit and control circuit respectively.
Wherein, Current Mutual Inductance circuit, control circuit 50 and open loop protection circuit 30 are connected by cable.
Present invention also offers a kind of power test device, this device can comprise: any one harmonic measure circuit in the above embodiment of the present invention.
Adopt the present invention, use open loop protection circuit in harmonic measure circuit when measuring circuit is opened a way measuring and protecting short circuit, thus can when metering circuit is opened a way, still measuring circuit is communicated with, thus avoid the Current Transformer Secondary coil in measuring circuit to produce very high electromotive force, thus can the electron device in 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, can not the technical matters of safe operation, realize carrying out harmonic detecting process to electric system with security and stability, and avoid the on-the-spot risk rear monitoring personnel of CT open circuit occurring and can not dispose in time, drastically increase the security of monitoring.
In the present invention's embodiment as shown in Figure 2, under power test device normal operation, normal operating 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, terminal block CT adopts side very high voltage, and voltage dependent resistor (VDR) starts, and is started, contact adhesive, CT circuit communication by electromagnetic induction guard relay.
From above description, can find out, present invention achieves following technique effect: adopt the present invention, use open loop protection circuit when measuring circuit is opened a way measuring and protecting short circuit, thus can when metering circuit is opened a way, still measuring circuit is communicated with, thus avoid the Current Transformer Secondary coil in measuring circuit to produce very high electromotive force, thus can the electron device in 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, can not the technical matters of safe operation, realize carrying out harmonic detecting process to electric system with security and stability, and avoid the on-the-spot risk rear monitoring personnel of CT open circuit occurring and can not dispose in time, drastically increase the security of monitoring.
The claimed controller of the application and each assembly forming this controller be all a kind of have determine shape, structure and occupy the entity products of certain space.Such as, microprocessor, signal processor, sub-processor etc. are all can independent operating, the computer equipment with particular hardware structure, terminal or server.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a harmonic measure circuit, is characterized in that, comprising:
Measuring and protecting circuit;
Open loop protection circuit, with described measuring and protecting circuit in parallel, for when harmonic measure circuit loop disconnect by described measuring and protecting short circuit.
2. harmonic measure circuit according to claim 1, is characterized in that, 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 when described Current Mutual Inductance open circuit by described metering circuit short circuit, to be communicated with the loop of described harmonic measure circuit.
3. harmonic measure circuit according to claim 2, is characterized in that, 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).
4. harmonic measure circuit according to claim 3, is characterized in that,
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 first winding is connected with the ground wire of described control circuit; The first end of the second winding of described voltage transformer (VT) is connected with the first end of described guard relay, and the second end of described second winding is connected with the second end of described guard relay;
The contact of described guard relay is connected with the C of the A phase of described control circuit, the B phase of described control circuit and described control circuit respectively.
5. harmonic measure circuit according to claim 4, is characterized in that, described guard relay comprises the first sub-contact, the second sub-contact, the 3rd sub-contact, wherein,
Described first sub-contact is connected on the cable of A phase of described control circuit;
Described second sub-contact is connected on the cable of B phase of described control circuit;
Described 3rd sub-contact is connected on the cable of C phase of described control circuit.
6. harmonic measure circuit according to claim 4, is characterized in that, the second end of described first winding is connected with the C of the A phase of described control circuit, the B phase of described control circuit and described control circuit respectively.
7. harmonic measure circuit according to claim 2, is characterized in that, described Current Mutual Inductance circuit, described control circuit and described open loop protection circuit are connected by cable.
8. a power test device, is characterized in that, comprising: the harmonic measure circuit in claim 1 to 7 described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310542816.2A CN104614587B (en) | 2013-11-05 | 2013-11-05 | Harmonic measure circuit and power test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310542816.2A CN104614587B (en) | 2013-11-05 | 2013-11-05 | Harmonic measure circuit and power test device |
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| Publication Number | Publication Date |
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| CN104614587A true CN104614587A (en) | 2015-05-13 |
| CN104614587B CN104614587B (en) | 2017-11-14 |
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| CN201310542816.2A Active CN104614587B (en) | 2013-11-05 | 2013-11-05 | Harmonic measure circuit and power test device |
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| CN1611953A (en) * | 2003-10-27 | 2005-05-04 | 贺守正 | Method for measuring factory harmonic wave and measuring instrument |
| CN101179188A (en) * | 2007-09-24 | 2008-05-14 | 山东彼岸电力科技有限公司 | Second open circuit protector of current mutual inductor |
| JP2010154631A (en) * | 2008-12-25 | 2010-07-08 | Chugoku Electric Power Co Inc:The | Device for preventing opening of secondary circuit in current transformer for measuring instrument |
| CN101782607A (en) * | 2009-01-19 | 2010-07-21 | 上海华建电力设备股份有限公司 | Frequency-conversion harmonic measuring device of electrical power system |
| CN102323477A (en) * | 2011-06-09 | 2012-01-18 | 南京信息工程大学 | Method and apparatus for measuring interhamonics of power grid |
| CN103185835A (en) * | 2013-03-28 | 2013-07-03 | 国家电网公司 | Electric energy metering device with electric energy quality monitoring function |
| CN203705545U (en) * | 2013-11-05 | 2014-07-09 | 国家电网公司 | Harmonic wave measuring circuit and electric energy testing device |
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2013
- 2013-11-05 CN CN201310542816.2A patent/CN104614587B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1611953A (en) * | 2003-10-27 | 2005-05-04 | 贺守正 | Method for measuring factory harmonic wave and measuring instrument |
| CN101179188A (en) * | 2007-09-24 | 2008-05-14 | 山东彼岸电力科技有限公司 | Second open circuit protector of current mutual inductor |
| JP2010154631A (en) * | 2008-12-25 | 2010-07-08 | Chugoku Electric Power Co Inc:The | Device for preventing opening of secondary circuit in current transformer for measuring instrument |
| CN101782607A (en) * | 2009-01-19 | 2010-07-21 | 上海华建电力设备股份有限公司 | Frequency-conversion harmonic measuring device of electrical power system |
| CN102323477A (en) * | 2011-06-09 | 2012-01-18 | 南京信息工程大学 | Method and apparatus for measuring interhamonics of power grid |
| CN103185835A (en) * | 2013-03-28 | 2013-07-03 | 国家电网公司 | Electric energy metering device with electric energy quality monitoring function |
| CN203705545U (en) * | 2013-11-05 | 2014-07-09 | 国家电网公司 | Harmonic wave measuring circuit and electric energy testing device |
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| CN104614587B (en) | 2017-11-14 |
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