CN105259424A - Electric generator iron loss test apparatus and experimental method - Google Patents

Abstract

The invention discloses an electric generator iron loss test apparatus and an experimental method. According to the invention, one end of a grouping test cable is connected directly with a switchgear, the other end is wounded onto an iron core of an electric generator for a set number of turns and then connected to the switchgear, and the switchgear is connected with a power supply through a power supply cable; the grouping test cable comprises a plurality of groups of test cables of different number and length. The invention has the beneficial effects of being capable of greatly accelerating the test connection link, ensuring a safe and reliable test, meanwhile greatly reducing work hours and improving work efficiency.

Description

A kind of generator cores-loss test device and experimental technique

Technical field

The present invention relates to generator iron loss experimental technique field, particularly relate to a kind of generator cores-loss test device and experimental technique.

Background technology

The power industry of current China has entered the stage of bulk power grid and large-sized unit, and fuel-burning power plant is still the theme of China's power industry.Electricity generator stator core is assembled by silicon steel plate stacking; due to assembling and the reason manufactured and the effect of operating heat and mechanical force, siliconized plate insulation between plates is caused to damage, the heating of iron core partial short-circuit; stator insulation line rod can be damaged time serious, cause stopping accident.According to DL/T596-1996 " power equipment hand-over and preventive test code " regulation, " new assembling or after changing, repairing siliconized plate, when changing winding, if desired ", needs to carry out stator cores-loss test to generator.In " preventing 25 important requirements of electrical production accident ", this be give also and illustrate and regulation: " during maintenance, stator core is carefully checked; note abnormalities phenomenon; as the loose tooth in local, lamination shortage, outside surface attachment black greasy dirt etc.; electricity generator stator core fault diagnostic test should be carried out in conjunction with actual abnormal conditions, or temperature rise and cores-loss test, check that iron core insulation between plates is with or without short circuit and iron core heat condition; analyzing defect reason, and process in time ".In recent years, domestic multiple stage generator occurs that stator core large area loosens, wear and tear even burning accident, all can successfully find in time by carrying out stator cores-loss test, decrease loss and the accident that avoids further develop.Therefore, carry out generator cores-loss test to have very important significance.

But, generator cores-loss test device unripe at present.The test unit that conventional cores-loss test is also unfixing, the 6kV cable of the whole radical of general interim preparation one hundred meters long, is pulled by several staff, is repeatedly wound around generator iron-core multi-turn.Because cable quality is large, the singularity of core structure, only allows pure manual operation, workload is very large, and the several testing crew collaborative work of General Requirements reaches three to four hours, after energizing test terminates, need by cable again wraparound go, same consume number in very large man-hour.According to statistics, the consumption number in man-hour of iron core winding link is in accounting in whole cores-loss test process up to 77.2%, and this carries out to test and brings great inconvenience.In addition, in cable windings process, trample iron core for a long time and line rod also dirtyly can be brought in generator by what be infected with, pull that improper operation in process is also easy brings unnecessary damage to generator unit stator.

Summary of the invention

Object of the present invention is exactly to solve the problem, and proposes a kind of generator cores-loss test device and experimental technique, and greatly can reduce test and consume number in man-hour, increase work efficiency, warranty test is carried out smoothly.

To achieve these goals, the present invention adopts following technical scheme:

A kind of generator cores-loss test device, comprising: group experiment cable, switch cubicle and feed cable;

One end of described group experiment cable is directly connected with switch cubicle, and the other end is also connected to switch cubicle after the generator iron-core setting number of turn, and described switch cubicle is connected with power supply by feed cable; Described group experiment cable comprises some groups of quantity and length test cable not etc.

Be connected in series by switch cubicle between described some groups of test cables.

Described switch cubicle comprises isolating switch, fuse, voltage transformer (VT), current transformer, low power-factor wattmeter, reometer and voltage table; Described switch cubicle is also provided with the interface for connecting group experiment cable and feed cable.

An experimental technique for generator cores-loss test device, comprises the following steps:

1) corresponding group experiment cable is chosen according to generator electric parameter and mechanical dimension;

2) the every root experiment cable one end in group experiment cable is connected directly to switch cubicle, the other end is connected to switch cubicle after walking around generator iron-core 1 circle again; Ensure to be connected in series in switch cubicle between each group experiment cable in termination process;

3) feed cable one end is connected to station service, other end access switch cubicle;

4) after check test wiring correctly, switch cubicle closes a floodgate, send station service, energizing test, reads and the data of recording ammeter, voltage table and low power-factor wattmeter, according to described data calculating generator core loss, carries out iron-core mass differentiation;

5) after energizing test terminates, stop station service, switch cubicle separating brake, remove the wiring of feed cable, group experiment cable and switch cubicle, off-test.

The invention has the beneficial effects as follows:

1. the present invention can greatly accelerate test connection link, while warranty test is safe and reliable, considerably reduces and consumes number in man-hour, improve work efficiency;

2. owing to consuming a large amount of minimizings of number in man-hour, test clerk reduced greatly in the residence time of generator, reduced further the damage of generator and uncontrollable and unsafe factor;

3. generator core loss value shows in real time, and test findings is more directly perceived; Improve the enthusiasm tested and carry out simultaneously, be more conducive to pinpointing the problems timely and effectively.

Accompanying drawing explanation

Fig. 1 is generator cores-loss test device schematic diagram of the present invention;

Fig. 2 is switch cubicle schematic diagram;

Fig. 3 is switch cubicle schematic diagram.

Wherein, 1. group experiment cable assembly, 2.10kV switch cubicle, 3. feed cable, 4. generator, 5. on-off switch, 6. isolating switch, 7. fuse, 8. voltage transformer (VT), 9. current transformer, 10. measures the low power-factor wattmeter of core loss, 11. reometers, 12. voltage tables.

Embodiment:

Below in conjunction with accompanying drawing and example, the present invention will be further described:

In Fig. 1, a kind of generator 4 cores-loss test device, the 10kV switch cubicle 2 comprising group experiment cable 11 and carry out being electrically connected with group experiment cable 11, the feed cable 3 of access station service electrical;

One end of group experiment cable 1 is directly connected with switch cubicle, and the other end is also connected to switch cubicle after the generator 4 iron core setting number of turn, and switch cubicle is connected with power supply by feed cable 3; Group experiment cable 1 comprises some groups of quantity and length test cable not etc.; Group experiment cable 1 be for generator 4 cores-loss test can for a long time by the test cable of big current;

Be connected with 6kV station service by switch cubicle in test, be also connected to switch cubicle after every root test cable is wound around separately iron core, between test cable, carry out connected in electrical series connection by switch cubicle; As shown in Figure 3.

As shown in Figure 2,10kV switch cubicle 2 is metal enclosed fixed switching cabinets; Comprise on-off switch 5, isolating switch 5, fuse 7, voltage transformer (VT) 8, current transformer 9, low power-factor wattmeter 10, reometer 11, voltage table 12 etc. to measure, control and protection element;

10kV switch cubicle 2 is connected with feed cable 3 respectively with group experiment cable 1, for the safe start and stop that the electrical connection between group experiment cable 1, core loss are measured and tested, has secured electrical and connects and fault actions function.

Traditional test connection needs to drag one whole longer cable and is repeatedly wound around iron core number circle, and its two ends are connected to station service switchgear building; And each root stub cable of PacketCable is only wound around iron core one circle, its two ends are connected to the other switch cubicle of generator 4, and switch cubicle power supply is connected to station service switchgear building; The quantity of PacketCable needed for generator 4 cores-loss test device and length are mechanical dimension based on 4 groups, domestic mainstream bulk turbodynamo and electric parameter, calculate determine through statistical study, as shown in table 1 below.

For meeting the 4 groups of testing requirementss of all generators, the cable assembly of generator 4 cores-loss test device is: 6, length 29.3m cable, 2, length 26.4m cable, 4, length 2.4m cable, 4, length 19.7m cable.

The combination of the required PacketCable of 4 groups, each generator test is as shown in table 2 below.

PacketCable combination needed for the 4 groups of cores-loss tests of the domestic main generator of table 2

The experimental technique of generator 4 cores-loss test device of the present invention, concrete steps are as follows:

1) calculate according to generator 4 electric parameter and mechanical dimension and choose corresponding group experiment cable 1, choosing combination as shown in table 2;

2) the every root experiment cable one end in group experiment cable 1 is connected directly to switch cubicle, the other end is connected to switch cubicle after walking around generator 4 iron core 1 circle again, be wound around combination as shown in table 2, in connection procedure, between each group experiment cable, in switch cubicle, ensure electrically serial connection;

3) feed cable 3 one end is connected to station service, other end access switch cubicle; Carry out safeguard measure simultaneously;

4) after check test wiring correctly, switch cubicle closes a floodgate, send station service, energizing test, read and the test figure of recording ammeter 11, voltage table 12 and low power-factor wattmeter 10, finally require calculating generator 4 core loss according to GB/T20835-2007 " generator 4 Magnetizing Test for Stator Core directive/guide ", carry out iron-core mass differentiation;

5) after energizing test terminates, stop station service, switch cubicle separating brake, remove the wiring of feed cable 3, group experiment cable 1 and switch cubicle, off-test.

Principle of work of the present invention:

Need cable long for hundreds of rice to be wound around repeatedly iron core in operation based on traditional cores-loss test and caused the large problem of consumption number in man-hour, the electric parameter of principal statistical domestic mainstream bulk turbodynamo 4 groups of iron cores and mechanical dimension, make many groups quantity and length group experiment cable 1 not etc. and combine 1, and be electrically connected respectively by switch cubicle, abandon the link that whole cable is wound around repeatedly, iron core winding acting is measured comparatively traditional means of experiment and is greatly reduced, group experiment cable 1 combines 1 can adapt to domestic mainstream bulk turbodynamo 4 cores-loss test requirement, and iron loss electrical quantities measurement is built in switch cubicle, without the need to accessing separately meter meter, simple and convenient.

The present invention adopts the mode of connection of group experiment cable 1, design matches with it for the 10kV switch cubicle 2 of generator 4 cores-loss test, test core coiling acting amount greatly reduces, after completing wiring, send into 6kV station service and get final product energizing test, after off-test, remove group experiment cable 1, acting amount of taking out stitches equally also greatly reduces.

Take length as the test cable of 300m be example around 160MW generator 4 iron core 15 circle of girth 20m, suppose that cable unit weight is 1.5kg/m, the friction force factor on testing crew and ground is 1.0, according to traditional experimental technique, do not use generator 4 cores-loss test device, then iron core winding acting amount is:

$W=\underset{0}{\overset{300}{\∫}}1.0\×1.5\×(300-x)\·9.8\·dx=661.5KJ$

Use generator 4 iron core test unit, use group experiment cable 1 experimental technique, then iron core winding acting amount is:

$W*=15\×\underset{0}{\overset{20}{\∫}}1.0\×1.5\×(20-x)\·9.8\·dx=44.1KJ$

Laborsaving coefficient k=W/W*=661.5 ÷ 44.1=15.

By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (4)

1. a generator cores-loss test device, is characterized in that, comprising: group experiment cable, switch cubicle and feed cable;

One end of described group experiment cable is directly connected with switch cubicle, and the other end is also connected to switch cubicle after the generator iron-core setting number of turn, and described switch cubicle is connected with power supply by feed cable; Described group experiment cable comprises some groups of quantity and length test cable not etc.

2. a kind of generator cores-loss test device as claimed in claim 1, be is characterized in that, be connected in series between described some groups of test cables by switch cubicle.

3. a kind of generator cores-loss test device as claimed in claim 1, it is characterized in that, described switch cubicle comprises isolating switch, fuse, voltage transformer (VT), current transformer, low power-factor wattmeter, reometer and voltage table; Described switch cubicle is also provided with the interface for connecting group experiment cable and feed cable.

4. an experimental technique for generator cores-loss test device as claimed in claim 1, is characterized in that, comprise the following steps:

1) corresponding group experiment cable is chosen according to generator electric parameter and mechanical dimension;

2) the every root experiment cable one end in group experiment cable is connected directly to switch cubicle, the other end is connected to switch cubicle after walking around generator iron-core 1 circle again; Ensure to be connected in series in switch cubicle between each group experiment cable in termination process;

3) feed cable one end is connected to station service, other end access switch cubicle;

4) after check test wiring correctly, switch cubicle closes a floodgate, send station service, energizing test, reads and the data of recording ammeter, voltage table and low power-factor wattmeter, according to described data calculating generator core loss, carries out iron-core mass differentiation;

5) after energizing test terminates, stop station service, switch cubicle separating brake, remove the wiring of feed cable, group experiment cable and switch cubicle, off-test.