CN202815146U

CN202815146U - Polarity detector for mutual inductor

Info

Publication number: CN202815146U
Application number: CN 201220537157
Authority: CN
Inventors: 牟鸣; 冯术权
Original assignee: CHONGQING CHUANG ZHENG TRANSFORMERS Ltd
Current assignee: CHONGQING CHUANG ZHENG TRANSFORMERS Ltd
Priority date: 2012-10-19
Filing date: 2012-10-19
Publication date: 2013-03-20
Anticipated expiration: 2022-10-19

Abstract

The utility model discloses a polarity detector for a mutual inductor. The polarity detector is characterized by comprising a pedestal, wherein the pedestal is provided with a battery clamping groove and a current meter clamping groove, the battery clamping groove is provided with a dry battery, and cables are respectively led out from two ends of positive and negative electrodes of the dry battery; the current meter clamping groove is provided with a milliammeter, and cables are respectively led out from two connecting ends of the milliammeter; the cable led out from the negative electrode end of the dry battery is connected with a switch; the leading-out cables of the dry battery and the leading-out cables of the milliammeter are connected with alligator clips; and the switch is fixed on the pedestal. The polarity detector provided by the utility model has the beneficial effects that the detection process is greatly simplified, the detection can be completed by a single person independently, the cost is reduced, the operation is simple, the working time is shortened, the working efficiency is improved, and the detector is integrated and is convenient to carry.

Description

The mutual inductor polarity detector

Technical field

The utility model relates to a kind of mutual inductor protective device, specifically, relates in particular to a kind of mutual inductor polarity detector.

Background technology

In production practices; because current transformer polarity and wiring are incorrect; cause the protective device mistake action and rejecting action; the power outage that causes therefrom happens occasionally; for example: Shixi area 110 kV Luliang transformer stations and the not northern transformer station of 35 kV are all because of 1; No. 2 main transformer differential protective current mutual inductor polarities and wiring existing problems cause the dead electricity of repeatedly entirely standing.Therefore, judge that correctly the polarity of current transformer and the correctness of secondary connection are very important.Especially will carry out verification to mutual inductor after having changed mutual inductor after the new installation of device or overhaul, whether the configuration of testing its polarity is correct.

Manual detection current transformer program is as follows at present: have three people to cooperate experiment, one people takes dry cell, battery plus-negative plate is connected to the two ends of current transformer primary side, and the second people takes milliammeter to connect the secondary side of current transformer, and the deflection situation of observing milliammeter can be judged the polarity of mutual inductor.A lot of powerful volt-ampere characteristic pick-up units are certainly arranged now on the market, but these devices have a lot of functions usually, one of them function is to detect the polarity of current transformer.

The defective of prior art is: adopt existing manual detection method to need at least 3 people could finish test job, personnel are redundant, and efficient is lower, and test instrument is scattered, and wiring is chaotic, and uses existing device because function is more, mostly bulky, Heavy Weight, not portable, complicated operation, field condition is had relatively high expectations, for the place that only needs the measuring current mutual inductor polarity, this is obviously very inconvenient, not Portable belt.

The utility model content

The utility model purpose is to provide a kind of simple and easy mutual inductor polarity detector, but single complete independently is simple to operate, and the instrument integration one, is easy to carry.

For achieving the above object, the utility model provides a kind of mutual inductor polarity detector, its key is: described mutual inductor polarity detector comprises pedestal, be provided with battery draw-in groove and reometer draw-in groove on the described pedestal, on the described battery draw-in groove dry cell is installed, described dry cell positive and negative electrode two ends are outgoing cable respectively; On the reometer draw-in groove milliammeter is installed, these milliammeter two terminals are outgoing cable respectively.Be connected to switch in the described dry battery cathode end outgoing cable.

The dry cell positive and negative electrode is connected on mutual inductor primary winding or the secondary coil, and milliammeter is connected on another coil of mutual inductor.In the moment of switch closure, the dash current of dry cell output flows to milliammeter through mutual inductor, and the milliammeter pointer turns to the polar relationship that just can indicate primary winding and secondary coil.

By pedestal, battery and milliammeter unification are fixed together, make checkout equipment integrated, be easy to carry.By battery two-stage and milliammeter two terminal stud outgoing cables, can freely measure the position that needs, need not to move tested mutual inductor and can finish detection.

The outgoing cable of described dry cell and the outgoing cable of milliammeter all are connected with crocodile clip.Crocodile clip is fixed in the far-end of outgoing cable.Crocodile clip can clamp check point well, guarantees to detect effect.

Described switch is fixed on the described pedestal.

The beneficial effects of the utility model are: greatly simplify so that detect operation, single can the detection by complete independently reduced cost, and be simple to operate, shortens working hours, increase work efficiency, and the instrument integration one, be easy to carry.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is this use new-type circuit schematic diagram.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

As shown in Figure 1: described mutual inductor polarity detector comprises pedestal 1, is provided with battery draw-in groove 2 and reometer draw-in groove 3 on the described pedestal, on the described battery draw-in groove 2 dry cell B is installed, and described dry cell B positive and negative electrode two ends are outgoing cable respectively; Milliammeter A is installed on the reometer draw-in groove 3, and this milliammeter A two terminals are outgoing cable respectively.

By pedestal 1, battery B and milliammeter A unification are fixed together, make checkout equipment integrated, be easy to carry.By battery B two-stage and milliammeter A two terminal stud outgoing cables, can freely measure the position that needs, need not to move tested mutual inductor and can finish detection.

Described outgoing cable is respectively arranged with a crocodile clip C at far-end.Crocodile clip can better make the end clamp check point, increases to measure contact area, guarantees to detect effect.

Access K switch in the described dry cell B negative pole end outgoing cable.Described K switch also is fixed on the described pedestal 1.K switch can prevent the two crocodile clips touching of battery plus-negative plate outgoing cable and the short circuit phenomenon that occurs, has avoided because the battery discharge that maloperation causes.

Dry cell B positive and negative electrode is connected on mutual inductor primary winding or the secondary coil, and milliammeter A is connected on another coil of mutual inductor.In the moment of K switch closure, the dash current of dry cell B output flows to milliammeter A through mutual inductor, and milliammeter A pointer turns to the polar relationship that just can indicate primary winding and secondary coil.

As shown in Figure 2, selecting dry cell B in the implementation case is 3V voltage, and milliammeter A detects for ± 50mA range.The crocodile clip C of the anodal leading-out terminal of dry cell B is connected with the primary winding L1 of mutual inductor, and the negative pole outlet is connected with primary winding L2, and the secondary side K1 of mutual inductor connects the anodal outlet of milliammeter A, and K2 connects the negative pole leading-out terminal of milliammeter A.After finishing wiring, Closing Switch K, if milliammeter A pointer is to positive range deflection, and the simultaneously visible milliammeter A pointer of cut-off switch K is to the deflection of negative quantity journey, illustrate that the termination that mutual inductor is connected on the dry cell A positive pole is same polarity with the termination that is connected on milliammeter A anode, be that K1 and L1 are same polarity, otherwise then K1 and L2 are same polarity.

Claims

1. mutual inductor polarity detector, it is characterized in that: comprise pedestal (1), be provided with battery draw-in groove (2) and reometer draw-in groove (3) on the described pedestal, dry cell (B) is installed on the described battery draw-in groove (2), described dry cell (B) positive and negative electrode two ends are outgoing cable respectively; Milliammeter (A) is installed on the reometer draw-in groove (3), and this milliammeter (A) two terminals are outgoing cable respectively;

Be connected to switch (K) in described dry cell (B) the negative pole end outgoing cable.

2. mutual inductor polarity detector according to claim 1, it is characterized in that: the outgoing cable of the outgoing cable of described dry cell (B) and milliammeter (A) all is connected with crocodile clip (C).

3. mutual inductor polarity detector according to claim 1, it is characterized in that: described switch (K) is fixed on the described pedestal (1).