CN104698335B

CN104698335B - The method that high voltage substation systematization debugging is realized using low tension

Info

Publication number: CN104698335B
Application number: CN201310662550.5A
Authority: CN
Inventors: 樊剑飞
Original assignee: MCC Tiangong Group Corp Ltd
Current assignee: MCC Tiangong Group Corp Ltd
Priority date: 2013-12-06
Filing date: 2013-12-06
Publication date: 2018-03-16
Anticipated expiration: 2033-12-06
Also published as: CN104698335A

Abstract

A kind of method that high voltage substation systematization debugging is realized using low tension; in transformer station, monomer experiment terminates; bus, cable connection finish; all relay protection devices and measuring equipment go up working power; transformer station is not before by high-tension electricity; by adding single-phase 220V, three-phase 380V low tensions in a different manner to transforming plant primary bus; then the corresponding voltage of secondary circuit is measured to judge whether whole group voltage transformer connected mode is correct; simultaneously by Circuit Fault on Secondary Transformer short circuit, apply 380V low tensions in primary side and check that there is indifference stream in differential current protection loop.This method is the completion using the common advance system of 220V, 380V low tension：The connected mode of whole group voltage transformer first and second is checked, checks differential protection loop.Danger and the hidden danger of Normal practice are prevented, while avoids human error, it is simple to operate, save the human cost of a large amount of school ray examination secondary circuits.

Description

The method that high voltage substation systematization debugging is realized using low tension

Technical field

The invention belongs to the method for high voltage substation systematization debugging, more particularly to one kind realizes high voltage variable using low tension The method of electric power station systemization debugging.

Background technology

General newly-built factories and miness 10/0.4kV, the debugging of 35/10kV transformer stations, all it is that each power equipment carries out monomer assays After end, check that the primary and secondary connection of voltage transformer group is correct by work such as wiring checks, power source bus by Judge the correctness of voltage transformer group by measuring voltage transformer secondary line voltage after electricity, current transformer group is similar Method be to be judged by the secondary current of measurement current transform er, system after by electricity not big load current send out When, the electric current for flowing through transformer is seldom, it is not easy to judge whether its function is normal, thus differential current protection loop is only becoming It can just be overhauled after the big load of power station band or throwing reactive power compensator, it is thorough that converting station debugging work is just calculated after the completion of all these Complete at bottom.But it can be seen that this method is not in advance due to not having systematic inspection current differential protection loop in advance System checks the connected mode of whole group voltage transformer.In transformer station after by electricity, then checked, in addition to stopping power transmission repeatedly, Very big danger also be present, easily cause damage and the casualties of power equipment, and can cause to protect in substation operation Protect malfunction, metering inaccuracy.

The content of the invention

The technical problems to be solved by the invention are：One kind is provided and realizes that high voltage substation systematization is debugged using low tension Method.This method is the completion using the common advance system of 220V, 380V low tension：Inspection whole group voltage transformer one, Secondary connected mode, check differential protection loop.Danger and the hidden danger of Normal practice are prevented, while avoids human error, It is simple to operate, save the human cost of a large amount of school ray examination secondary circuits.

The technical scheme is that：

A kind of method that high voltage substation systematization debugging is realized using low tension, it is characterised in that：In transformer station's monomer Experiment terminates, and bus, cable connection finish, all relay protection devices and measuring equipment upper working power, transformer station not by Before high-tension electricity, by adding single-phase 220V, three-phase 380V low tensions in a different manner to transforming plant primary bus, then measure Whether the corresponding voltage of secondary circuit is correct while Circuit Fault on Secondary Transformer is short to judge whole group voltage transformer connected mode Connect, applying 380V low tensions in primary side checks that there is indifference stream in differential current protection loop；

Specific method is as follows：

1st, the system debug of first and second connected mode of whole group voltage transformer is checked, checks the two of voltage transformer pt The connection of star winding and open-triangular winding in secondary winding；Voltage signal twice need to be added during experiment：Three-phase is separately added into pair The three phase sine 380V low tensions of title, high pressure three-phase bus short circuit is added into single-phase sinusoidal 220V low tensions, checks general factories and miness Star winding and open-triangular winding correctness in 10/0.4kV, 35/10kV transformer substation voltage transformer secondary winding are sentenced Disconnected foundation such as table 1,

2nd, then connection is correct for the tabular relationship for meeting in table 1；Table 1

Wherein：

Ua1b1, Ub1c1, Uc1a1 are the line voltages of bis- star windings of PT,

Ua1n, Ub1n, Uc1n are the phase voltages of bis- star windings of PT,

Ua2b2c2 is the voltage of bis- open-triangular windings of PT,

Ua2n is to form a phase transformer secondary winding voltages in bis- open-triangular windings of PT, for 10/0.4kV systems PT no-load voltage ratios are in systemOnce plus 380V PT, secondary star windingIt is for PT no-load voltage ratios in 35/10kV systemsOnce plus 380V PT, secondary star winding

Effect of the present invention is：

This method is the completion using the common advance system of 220V, 380V low tension：Inspection whole group voltage transformer one, Secondary connected mode, check differential protection loop.Danger and the hidden danger of Normal practice are prevented, while avoids human error, It is simple to operate, save the human cost of a large amount of school ray examination secondary circuits.

Brief description of the drawings

Fig. 1 is the figure of method wiring one that high voltage substation systematization debugging is realized using low tension；

Fig. 2 is the figure of method wiring two that high voltage substation systematization debugging is realized using low tension；

Fig. 3 is the method instance graph that high voltage substation systematization debugging is realized using low tension；

In figure：

1 it is one section of bus-bar potential transformer, 2 be two sections of bus-bar potential transformers, 3 be bus connection switch, 4 is voltage transformer First winding wye connection, 5 be secondary windings of PT wye connection, 6 be secondary windings of PT open delta Connection, 7 be one section of bus of transforming plant primary, 8 be two sections of buses of transforming plant primary, 9.1 be three phase sine 380V low tensions, 9.2 Be interim bus short join line for single-phase sinusoidal 220V low tensions, 10,11 be mono- section of bus of 35kV, 12 35kV bis- sections of buses, 13 be Bus connection switch, 14 be 1#35/10kV main transformers, 15 be 2#35/10kV main transformers, 16 be 1# main transformer protection electric currents Transformer, 17 be 2# TA of Main Transformer Protection, 18 be bus differential protection Current Transformer, 19 be transformer secondary Side short circuit copper bar, 20 be three-phase symmetrical 380V sine ac power supplies, 21 be 1# differential protective device of transformer, 22 be bus differential protection Device, 23 are 2# differential protective device of transformer.

Embodiment

A kind of method that high voltage substation systematization debugging is realized using low tension：

Operation principle is：Terminate in the experiment of transformer station monomer, bus, cable connection finish, all relay protection devices and Measuring equipment goes up working power, and transformer station is not before by high-tension electricity.By adding in a different manner to transforming plant primary bus Single-phase 220V, three-phase 380V low tensions, the corresponding voltage of secondary circuit is then measured to judge whole group voltage transformer connection side Whether formula is correct.Simultaneously by Circuit Fault on Secondary Transformer short circuit, apply 380V low tensions in primary side and check differential current protection loop There is indifference stream.Specific method is as follows：

The system debug of first and second connected mode of whole group voltage transformer is checked, groundwork is to check mutual induction of voltage The connection of star winding and open-triangular winding in the secondary winding of device (english abbreviation PT).Voltage twice need to be added during experiment Signal：Three-phase is separately added into symmetrical three phase sine 380V low tensions, as shown in Figure 1.High pressure three-phase bus short circuit is added single Mutually sinusoidal 220V low tensions, check star-like in general factories and miness 10/0.4kV, 35/10kV transformer substation voltage transformer secondary winding The basis for estimation of winding and open-triangular winding correctness such as table 1, then connection is correct for the tabular relationship for meeting in table 1.

Fig. 2 is the wiring diagram of the system debug of differential protection loop, and this figure is with the mono- mother partition operations of 35kV, there is two Exemplified by the 35/10kV transformer stations of 35/10kV main transformers.4 band electrical shorts are transported in debugging to 1 logical 380V low tensions by 10 OK, then check 4 supporting 6 electric currents measured, in 11 indifference stream then 4 transformer differential loop first and second connect correctly. 4 inspections terminate, and remove 4 supporting 9.2, and closing 3 makes 2 by electricity, 5 powered short circuit operations.Check 3 supporting 8 electric currents measured 12 The loop first and second of middle indifference stream then bus differential protection connects correctly.5 supporting 7 electric current measured nothings in 13 are checked simultaneously The transformer differential loop first and second that difference flows then 5 connects correctly.

During a short circuit main transformer secondary side current bus of transformer, it is necessary to assure electric current can flow through main transformer secondary side after short circuit Current transformer primary winding.Main transformer electrification time can not be oversize in experiment.

Claims

A kind of 1. method that high voltage substation systematization debugging is realized using low tension, it is characterised in that：It is real in transformer station's monomer End is tested, bus, cable connection finish, and all relay protection devices and measuring equipment go up working power, and transformer station is not by height Before piezoelectricity, by adding single-phase 220V, three-phase 380V low tensions in a different manner to transforming plant primary bus, two are then measured Whether the corresponding voltage of minor loop is correct to judge whole group voltage transformer connected mode, while by Circuit Fault on Secondary Transformer short circuit, Apply 380V low tensions in primary side and check that there is indifference stream in differential current protection loop；

Specific method is as follows：

The system debug of first and second connected mode of whole group voltage transformer is checked, checks the secondary winding of voltage transformer pt In star winding and open-triangular winding connection；Voltage signal twice need to be added during experiment：Three-phase is separately added into symmetrical three Phase 380V low tensions, high pressure three-phase bus short circuit is added into single-phase 220V low tensions, checks general factories and miness 10/0.4kV, 35/ The judgement of star winding and open-triangular winding correctness in 10kV transformer substation voltage transformer secondary windings, specific connection It is：

A, first winding adds the alternating current 220V voltage of three-phase symmetrical, and line voltage is exchange 380V between three-phase, measurement it is secondary around Group voltage：(1) wherein secondary star winding, three-phase line voltage u_a1b1=u_b1c1=u_c1a1It is equal toThree-phase phase voltage again, with a It is exactly exemplified by phase phase voltage:U_a1n, three-phase phase voltage u_a1n=u_b1n=u_c1n；(2) wherein secondary open-triangular winding, opening Angle voltage U_a2b2c2=0V；

B, by three-phase first winding short circuit, single phase ac 220V voltages are added, line voltage is exchange 0V between three-phase, and measurement is secondary Winding voltage：(1) wherein secondary star winding, three-phase line voltage u_a1b1=u_b1c1=u_c1a1Equal to 0V, three-phase phase voltage u_a1n= u_b1n=u_c1n；2) wherein secondary open-triangular winding, opening angle voltage U_a2b2c2Equal to secondary star winding phase voltageTimes, It is exactly by taking secondary star winding a phase phase voltages as an example:U_a1n, secondary open-triangular winding is also equal to per phase winding phase voltage 3 times, it is exactly by taking secondary open-triangular winding a phase phase voltages as an example：3U_a2n,

Wherein：

U_a1b1、U_b1c1、U_c1a1It is the line voltage of bis- star windings of PT,

U_a1n、U_b1n、U_c1nIt is the phase voltage of bis- star windings of PT,

U_a2b2c2It is the voltage of bis- open-triangular windings of PT,

U_a2nIt is to form a phase transformer secondary winding voltages in bis- open-triangular windings of PT, for PT in 10/0.4kV systems No-load voltage ratio isOnce plus 380VPT, it is secondary star-like around u_a1b1=u_b1c1=u_c1a1= U_a1n=3.8V, it is for PT no-load voltage ratios in 35/10kV systemsOnce plus 380VPT, two Secondary star winding u_a1b1=u_b1c1=u_c1a1= U_a1n=1.089V。