阅读说明：本技术 一种二次回路绝缘检测装置 (A kind of secondary circuit insulation detection device ) 是由 陈嘉俊 吕义科 叶德富 吴洪波 张俊杰 于 2019-08-16 设计创作，主要内容包括：本发明提供一种二次回路绝缘检测装置。一种二次回路绝缘检测装置,其中,包括外壳、低频信号发生器、接线端、显示器、手持互感器以及电源模块,所述电源模块与所述显示器和低频信号发生器电连接,所述显示器与所述手持互感器电连接,所述低频信号发生器将低频信号输入接线端。本发明实现了检测装置由内部电源模块供电,无需接入变电站内运行的直流系统使用电源,避免拆接线风险和其他绝缘低的回路影响检测准确性。(The present invention provides a kind of secondary circuit insulation detection device.A kind of secondary circuit insulation detection device, wherein, including shell, low frequency generator, terminals, display, hand-held mutual inductor and power module, the power module is electrically connected with the display and low frequency generator, the display is electrically connected with the hand-held mutual inductor, and the low frequency generator is by low frequency signal input terminal.The present invention realizes detection device and avoids disconnecting line risk and other circuits for insulating low influence detection accuracies without accessing the direct current system run in substation using power supply by internal electric source module for power supply.)

1. a kind of secondary circuit insulation detection device, including shell (5), it is characterised in that: including low frequency generator, wiring (4), display, hand-held mutual inductor (1) and power module are held, the power module and the display and low frequency signal occur Device electrical connection, the display are electrically connected with the hand-held mutual inductor (1), and the low frequency generator inputs low frequency signal Terminals (4).

2. a kind of secondary circuit insulation detection device according to claim 1, it is characterised in that: terminals (4) include just Low frequency signal is inputted positive access point (41) by pole access point (41), the low frequency generator.

3. a kind of secondary circuit insulation detection device according to claim 2, it is characterised in that: the power module is institute It states display and low frequency generator provides the power supply of DC current.

4. a kind of secondary circuit insulation detection device according to claim 1, it is characterised in that: set on the shell (5) It sets power switch (3), the power switch (3) is electrically connected with the power module.

5. a kind of secondary circuit insulation detection device according to claim 1, it is characterised in that: set on the shell (5) It sets testing button (2), the testing button (2) is electrically connected with the low frequency generator.

6. a kind of secondary circuit insulation detection device according to claim 1, it is characterised in that: the hand-held mutual inductor (1) it is located at the outside of the shell (5), detects the low frequency signal of return.

7. a kind of secondary circuit insulation detection device according to claim 6, it is characterised in that: the hand-held mutual inductor It (1) is pincer.

Technical field

The present invention relates to technical field of insulation detection, more particularly, to a kind of secondary circuit insulation detection device.

Background technique

In the more area of rainfall, the insulation situation of substation secondary device is easy to appear problem, leads to substation two There is situations such as short circuit, tripping in secondary device.Common insulation tester in the work of Insulation monitoring is carried out in substation at present, The grounding point for the direct current system for needing to operate normally releases, then by the positive and negative anodes of insulation tester access direct current system, then It is unfolded to check the low branch that insulate, grounding point is positioned, needs to unlock the ground connection of direct current system in the process Point, and will test instrument positive and negative polarities and be connected to direct current system, line risk is disconnected in the presence of certain in direct current system, there is also influences pair The risk of station equipment direct current supply.The open special issue CN106896301A of China, publication date are on June 27th, 2017, this application A kind of Insulation Inspection System, including multiple insulation monitoring modules are disclosed, each insulation monitoring module includes control unit, opens Pass, sampling unit and low frequency signal source；Each control unit controls corresponding switch after corresponding insulation monitoring module powers on Closure, and signal in corresponding sampling unit sampling system is controlled, and judge according to the signal that corresponding sampling unit samples With the presence or absence of with corresponding low frequency signal source output signal same frequency and with the low frequency signal of duty ratio in system；Each control unit When also existing in systems with corresponding low frequency signal source output signal same frequency and with the low frequency signal of duty ratio, control is corresponding Switch disconnect；Also there is no with corresponding low frequency signal source output signal same frequency and with accounting in systems for each control unit When the low frequency signal of empty ratio, corresponding low frequency signal source output signal is controlled；Above-mentioned Insulation Inspection System can recognize that in system With the presence or absence of other insulation monitoring modules to work and carry out respective handling.Although the disclosure application has used low frequency signal State of insulation is detected, but specific branch and grounding point that each branch secondary cable insulation reduces can not be checked out.

Summary of the invention

It is an object of the invention to overcome existing substation's insulation detection device to need to access lacking for transformer station direct current system Point provides a kind of secondary circuit insulation detection device.The present invention realizes detection device by internal electric source module for power supply, without connecing Enter the direct current system run in substation and uses power supply.

In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of secondary circuit insulation detection device, In, including shell, low frequency generator, terminals, display, hand-held mutual inductor and power module, the power module It is electrically connected with the display and low frequency generator, the display is electrically connected with the hand-held mutual inductor, the low frequency Signal generator is by low frequency signal input terminal.Power module provides power supply for low frequency generator and display, into When row secondary circuit Insulation monitoring, the positive and negative electrode access point of terminals accesses the positive and negative electrode of secondary circuit to be measured, terminals Grounding point is directly grounded, and for low frequency generator by the anode of low frequency signal input terminal, what is connect with terminals is secondary Circuit receives low frequency signal, when display shows that the grounding point of terminals receives low frequency signal, with hand-held mutual inductor by Each branch cable on one detection secondary circuit is found out by the display of display and possesses ground connection low frequency signal formation current loop Branch cable, then searched downwards along the branch cable, when the place that ground connection low frequency signal suddenly disappears is the branch insulation Weak grounding point.

Further, terminals include positive access point, and the low frequency generator connects low frequency signal input anode Access point.Terminals further include cathode access point and grounding point, and the positive and negative electrode access point of terminals accesses secondary circuit to be measured The grounding point of positive and negative electrode, terminals is directly grounded.

Further, the power module provides the power supply of DC current for the display and low frequency generator. Power module provides power supply, and when detecting, secondary circuit insulation detection device does not have to the DC power system of access substation, In Substation can also carry out Insulation monitoring to secondary circuit to be measured when having a power failure.

Further, power switch is set on the shell, and the power switch is electrically connected with the power module.It is described Testing button is set on shell, and the testing button is electrically connected with the low frequency generator.

Further, the hand-held mutual inductor is located at the outside of the shell, detects the low frequency signal of return.It is described hand-held Mutual inductor is pincer.Hand-held mutual inductor can detect the low-frequency current in each branch cable on secondary circuit one by one, by low The current loop that frequency signal is formed finds the weak branch cable that insulate, then searches downwards along the branch cable, when ground connection low frequency The place that signal suddenly disappears is the grounding point of the branch.

Compared with prior art, the beneficial effects of the present invention are:

The present invention without accessing the direct current system run in substation using power supply when detection, is avoided by power module Disconnect line risk；The present invention only detects in the reduced secondary circuit of the insulation at certain interval, not by direct current system in substation Unite other circuits insulation influence；The present invention being capable of output low frequency alternating current by low frequency generator and hand-held mutual inductor Signal is reliably formed into a loop between secondary circuit, the earth, detects the low frequency signal of return, positioning both ground point.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of secondary circuit insulation detection device of the invention.

Fig. 2 is Insulation monitoring schematic diagram of the present invention.

It is as follows to illustrate description of symbols:

In Fig. 1-2: 1- holds mutual inductor, 2- testing button, 3- power switch, 4- terminals, 41- anode access point, and 42 Grounding point, 43- cathode access point.

Specific embodiment

The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration, What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art For, the omitting of some known structures and their instructions in the attached drawings are understandable.

The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；It is retouched in of the invention In stating, it is to be understood that if the orientation or positional relationship for having the instructions such as term " on ", "lower", "left", "right" is based on attached drawing Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than indication or suggestion is signified Device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore positional relationship is described in attached drawing Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can To understand the concrete meaning of above-mentioned term as the case may be.

It is as shown in Figure 1 a kind of first embodiment of secondary circuit insulation detection device of the present invention.A kind of secondary circuit is exhausted Edge detection device, power module are electrically connected with display and low frequency generator, and display and hand-held mutual inductor 1 pass through conducting wire Electrical connection, low frequency generator are electrically connected with terminals 4.

Wherein, terminals 4 include positive access point 41, grounding point 42 and cathode access point 43.When detection, anode is accessed Point 41 and cathode access point 43 are connect with the positive and negative anodes of secondary circuit to be measured, and grounding point 42 is directly grounded.Low frequency generator By the positive access point 41 of low frequency signal input terminal 4, the anode of secondary circuit to be measured is flowed to.Hand-held mutual inductor 1 uses Whether JKC80 split-core type current mutual inductor possesses the low frequency of ground connection forming circuit in each branch cable for detecting secondary circuit Signal code, display show testing result, reflect that surveyed branch whether there is Grounding.It should be noted that JKC80 is electric Stream forcipated mutual-inductor is that preferably, at low cost, it is not restrictive regulation that pincer structure, which meets the comfort of human hand held detection, It is also possible that other hand-held mutual inductors can complete similar effect.

In addition, being also provided with power switch 3 and testing button 2 on crust of the device, power switch 3 is connect with power module, Testing button 2 is electrically connected with low frequency generator.Power switch 3 controls the power supply of electric power source pair of module whole device, and test is pressed Button 2 controls low frequency generator, presses testing button 2, low frequency generator can just be believed to the positive output low frequency in circuit to be measured Number.

The working principle of the present embodiment is as follows: the positive access point 41 and cathode access point 43 of terminals and secondary circuit Positive and negative electrode connection, the grounding point 42 of terminals 4 are directly grounded, power switch 3 are opened, and press testing button 2, low frequency signal Generator uses any wave function generator of AFG31000, and any wave function generator generator of AFG31000 passes low frequency signal The anode for entering secondary circuit, since the grounding point of the branch cable and device that insulate low in secondary circuit to be measured passes through megarelief At circuit, low frequency signal is grounded along the secondary cable of low insulation branch, then passes through the grounding point of the earth access device, display Display grounding point 42 receives low-frequency singalling current, each branch cable for detecting secondary circuits by 1 one with hand-held mutual inductor at this time, The cable for possessing ground connection low-frequency singalling current is found out, the place for finding current vanishes after cable along the cable again, the ground are found The as grounding point of the branch ground connection direction that show through this embodiment can also position the lower position of insulation simultaneously.It needs To illustrate that any wave function generator of AFG31000 is not unique selection of the invention, low frequency signal can occurs in other Generator equally can be used.

It is illustrated in figure 2 a kind of Insulation monitoring schematic diagram of secondary circuit insulation detection device of the present invention, terminals are just Pole access point 41 and cathode access point 42 are connect with the positive and negative electrode of secondary circuit terminal block to be detected, and grounding point is directly grounded, dress The 41 output low frequency signal of positive access point set, display display device grounding point 42 receive low frequency signal, testing staff's benefit With each branch cable of hand-held mutual inductor 1 detection secondary circuit, low frequency signal is detected in the branch cable where K point, illustrates K Branch where point is low insulation branch, detects the disappearance of low frequency signal in K point, therefore K point is the grounding point of the branch cable. There is no low frequency signal in other branch cables of detection, illustrates do not occur low insulation situation in other branch cables.

Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention Protection scope within.