CN2293819Y

CN2293819Y - Transformer winding hot spot on-line monitoring instrument

Info

Publication number: CN2293819Y
Application number: CN 96237995
Authority: CN
Inventors: 刘君华
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 1996-12-31
Filing date: 1996-12-31
Publication date: 1998-10-07
Anticipated expiration: 2006-12-31

Abstract

The utility model relates to a transformer winding hot spot on-line monitoring instrument, comprising temperature-voltage changers, current sensors, analog quantity-discrete quantity changers, the oil temperature of the top layer and the bottom layer of time-sharing acquisition transformers of operators, high voltage winding current, and low voltage winding current. According to the IEC of transformers and hot point formula of computation suggested by load guiding roles, the operators give the hot-spot temperature of running high voltage winding and low voltage winding. The utility model has the alarming function for exceeding the limit, making operators or running controllers timely know the maximum temperature in the transformers to prevent or reduce the accidents of the overheating insulation of the transformers from happening.

Description

Coiling hot point of transformer on-line monitoring instrument

The utility model belongs to the electronic surveying field, is a kind of to maximum temperature---focus in the operating transformer winding, carries out the temperature measuring equipment of on-line monitoring.

Continuous development along with electric utility, the single transformer capacity constantly enlarges, winding cryogenic overheating problem, be one of operation and manufacturing department's gate pole important topic to be solved, hot spot temperature of winding is again the emphasis of cryogenic overheating, it directly influences transformer's life span, even can cause the burning damage accident of whole transformer.

The purpose of this utility model is to provide a kind of utilization monitoring transformer bottom or upper strata oil temperature, low pressure winding and high pressure winding current, according to the focus computing formula that proposes in IEC and the relative national standards, provide the coiling hot point of transformer on-line monitoring instrument (hereinafter to be referred as hot-spot monitor) of coiling hot point of transformer temperature by data operator.It had both had suitable accuracy, and economical and convenient provides high and low pressure hot spot temperature of winding value in the operating transformer at any time, and the off-limit alarm function is arranged again.To avoid or to reduce the generation of transformer insulated overheated incidents.

The utility model comprises a shell, encapsulation transducer in the enclosure, sensor and arithmetical unit, adopt three-way connection method between temperature-electric pressure converter and thermometric thermal resistance, the input end of current sensor is connected with two current measurement ends of current transformer, the input end of traffic pilot links to each other with the output terminal of temperature-electric pressure converter and current sensor respectively, analog quantity-the input end of discrete magnitude transducer links to each other with the output terminal of traffic pilot, and its output terminal is connected with the arithmetical unit input end.

Fig. 1 is the connection layout of the utility model monitor and input quantity.

Fig. 2 is a structure principle chart of the present utility model.

Fig. 3 the utility model temperature---the electrical schematic diagram of electric pressure converter.

The electric former figure of Fig. 4 the utility model traffic pilot.

Fig. 5 the utility model current sensor electrical schematic diagram.

Fig. 6 is the utility model analog quantity---discrete magnitude transducer and arithmetical unit embodiment 1 schematic diagram.

Fig. 7 is the utility model analog quantity---discrete magnitude transducer and arithmetical unit embodiment 2 schematic diagrams.

Below in conjunction with accompanying drawing structural principle of the present utility model and principle of work are explained.

With reference to Fig. 1, the utility model monitor 1 is installed in the generating plant or by electric main control room of electric substation or the outdoor transformer.The temperature survey noble potential input end A of monitor 1 is connected with cold end L11, L12 with the hot end H1 that the transformer top-oil temperature is measured with thermal resistance 2 respectively with electronegative potential input end B, C; Another temperature survey noble potential input end D of monitor 1 is connected with cold end L21, L22 with the hot end H2 of transformer bottom fuel temperature measurement with thermal resistance 3 respectively with electronegative potential input end E, F.Two terminal I, J of the current measurement input end of monitor 1 are connected with two current measurement ends of high pressure winding current mutual inductor 4 respectively; Other two input terminal K, M that monitor 1 is measured electric current are connected with two current measurement ends of low pressure winding current mutual inductor 5 respectively.Two groups of measurement terminal A, B, C and D of monitor, E, F, wherein terminal A and D, terminal B and E, terminal C and F equivalence respectively; Two groups of current measurement terminal I, J of monitor 1 and K, M, wherein terminal I and K, J and M equivalence respectively.Thermometric thermal resistance 2 and 3 adjustable positions are changed, and current transformer 4,5 adjustable positions are changed.

Comprise a shell P with reference to Fig. 2 and Fig. 1 the utility model, encapsulation temperature---

electric pressure converter

6,7 in the enclosure;

Current sensor

8,9; Traffic pilot 10; Analog quantity-discrete magnitude transducer 11; Arithmetical unit 12; Adopt the three-wire system connection method between temperature---electric pressure converter and the measurement thermal resistance, the noble potential input end A (or D) that is temperature-electric pressure converter 6 (or 7) is connected with a noble potential output terminal H1 (or H2) of thermometric thermal resistance 2 (or 3), and electronegative potential input end B, C (or E, F) are connected with other two end electronegative potential output terminal L11, L12 (or L21, L22) of thermometric thermal resistance; Two input end I, the J (or K, M) of current sensor 8 (or 9) are connected with two current measurement ends of current transformer 4 (or 5); Four input ends of traffic pilot 10 are connected with the output terminal of temperature-

electric pressure converter

6,7 and

current sensor

8,9 respectively; The input end of analog quantity-discrete magnitude transducer 11 is connected with the output terminal of traffic pilot 10; (or a plurality of) output terminal of analog quantity-discrete magnitude transducer 11 is connected with (or a plurality of) input end of arithmetical unit 12.

With reference to Fig. 3 and Fig. 2, Fig. 3 is the example of a circuit diagram of temperature-electric pressure converter 6 or 7.Fig. 3 be with an XTR103 type integrated circuit temperature-voltage transmission along be that the center is equipped with a little element formation, it has three input ends, the temperature survey noble potential input end A (D) that its a noble potential input end is exactly respectively a monitor 1; Temperature survey electronegative potential input end B (E) that its three electronegative potential input ends are exactly monitor 1 and C (F); Its output terminal U _T1(U _T2) with the input end U of traffic pilot 10 _T1(U _T2) be connected.

With reference to Fig. 4 and Fig. 2, Fig. 4 is the example of a circuit diagram of current sensor 8 or 9.Fig. 4 current sensor 8 (9) is to be made of an integrated circuit modules GIA, current measurement input end I (K) that its two input ends are exactly monitor 1 and J (M); Its output terminal U _I1(U _I2) with the input end U of traffic pilot 10 _I1(U _I2) be connected.

With reference to Fig. 5 and Fig. 2, Fig. 5 is the example of a circuit diagram of traffic pilot 10.Fig. 5 traffic pilot 10 is to be made of an integrated circuit (IC) chip CD4052.Its two input ends respectively with the output terminal U of temperature-

electric pressure converter

6,7 _T1, U _T2Be connected, its in addition two input ends respectively with the output terminal U of

current sensor

8,9 _I1, U _I2Be connected; Its output terminal U.Be connected with the input end of analog quantity-discrete magnitude transducer 11.

With reference to Fig. 6 and Fig. 2, Fig. 6 is the embodiment 1 of a circuit diagram of analog quantity-discrete magnitude transducer 11 and arithmetical unit 12.The circuit of analog quantity-discrete magnitude transducer 11 is V/F translation circuits.It is to be linked to each other with the output terminal of traffic pilot 10 by its input end of integrated circuit (IC) chip LM331; Its output terminal links to each other with an input end of arithmetical unit 12; The circuit of arithmetical unit 12 is single-chip microcomputers 8031, its T ₀End is input end.

With reference to Fig. 7 and Fig. 2, it is an embodiment 2 of analog quantity-discrete magnitude transducer 11 and arithmetical unit 12 circuit diagrams.The circuit of analog quantity-discrete magnitude transducer 11 is A/D converter circuit, and its input end is connected with the output terminal of traffic pilot 10; Its data output end B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, B11, B12, OR, POL are connected with input end P0.0, P0.1, P0.2, P0.3, P0.4, P0.5, P0.6, the P0.7 of arithmetical unit 12 successively; Its switcher state output identification end STATUS, sheet choosing end CE/LOAD, low byte Enable Pin LBEN, high byte Enable Pin HBEN successively with the INT of arithmetical unit.RD, P2.0, P2.1 end interconnect.Above-mentioned control end is provided with 12 the scale-of-two outputs of assurance with A/D converter by required level.Polarity position and an overflow position output, divide low byte and high byte export to for twice that arithmetical unit 12, arithmetical unit 12 will be imported, represent transformer top layer (or bottom) oil temperature signal U _T1(U _T2); Represent the current signal U of transformer high-voltage winding (or low pressure winding) _I1(or U _I2), according to the focus computing formula calculating transformer hot spot temperature of winding h that proposes in IEC and the relative national standards.

This monitor both can have been monitored the focus of single current road Transformer Winding, also can monitor the focus of multithread road Transformer Winding.

Claims

1, coiling hot point of transformer on-line monitoring instrument, comprise a shell, encapsulation transducer in the enclosure, sensor and arithmetical unit, it is characterized in that: temperature-electric pressure converter is connected with the thermometric thermal resistance, the input end of current sensor is connected with two current measurement ends of current transformer, the input end of traffic pilot links to each other with the output terminal of temperature-electric pressure converter and current sensor respectively, analog quantity-the input end of discrete magnitude transducer links to each other with the output terminal of traffic pilot, and its output terminal is connected with the arithmetical unit input end.

2, coiling hot point of transformer on-line monitoring instrument according to claim 1, it is characterized in that: the noble potential input end of the XTR103 type integrated circuit temperature-voltage transmitter in described temperature-electric pressure converter is the temperature survey noble potential input end of monitor, two electronegative potential input end is a temperature survey electronegative potential input end, and its output terminal is connected with the input end of traffic pilot.

3, coiling hot point of transformer on-line monitoring instrument according to claim 1, it is characterized in that: described current sensor adopts integrated circuit GIA, its input end is the current measurement input end of monitor, and its output terminal is connected with the input end of traffic pilot.

4, coiling hot point of transformer on-line monitoring instrument according to claim 1, it is characterized in that: described traffic pilot adopts integrated circuit (IC) chip CD4052, two input end is connected with the output terminal of temperature-electric pressure converter respectively, its two input ends in addition are connected with the output terminal of current sensor respectively, and its output terminal is connected with the input end of analog quantity-discrete magnitude transducer.

5, coiling hot point of transformer on-line monitoring instrument according to claim 1, it is characterized in that: described analog quantity-discrete magnitude converter using integrated circuit (IC) chip LM331, its input end links to each other with the output terminal of traffic pilot, and its output terminal links to each other with the input end of arithmetical unit single-chip microcomputer 8031.