CN102411097B

CN102411097B - Test control device for current transformer

Info

Publication number: CN102411097B
Application number: CN201010287417.2A
Authority: CN
Inventors: 邢晓; 吕敏; 刘妍; 范青
Original assignee: Henan Pinggao Toshiba High Voltage Switchgear Co Ltd
Current assignee: HENAN PINGZHI HIGH VOLTAGE SWITCHGEAR CO., LTD.
Priority date: 2010-09-20
Filing date: 2010-09-20
Publication date: 2014-06-25
Anticipated expiration: 2030-09-20
Also published as: CN102411097A

Abstract

The invention provides a test control device for a current transformer. The test control device is characterized in that: an output end of a power supply unit is connected with a voltage regulation unit and a power supply input end of a function control unit; the output end of the voltage regulation unit is connected with the input end of a voltage transformation unit and the output end of the voltage transformation unit is connected with a volt-ampere property test unit and the power supply input end of a power-frequency voltage withstand test unit; the power supply input end of an insulation resistor test unit is used for connecting a megameter; a volt-ampere property test control end, a power-frequency voltage withstand test control end and an insulation resistor test control end of the function control unit are respectively connected with control signal input ends of the volt-ampere property test unit, the power-frequency voltage withstand test unit and the insulation resistor test unit; a current transformer connection plug-in comprises a multi-connection-terminal connection plate which is used for connecting each joint of the current transformer to be detected and a plug; the connection plate is correspondingly connected with the corresponding terminal of the plug, and the plug is used for being plugged in the volt-ampere property test unit or the power-frequency voltage withstand test unit or the insulation resistor test unit. With the adoption of the test control device, the test efficiency of the current transformer is improved.

Description

A kind of test control device for current transformer

Technical field:

The present invention relates to a kind of test control device for current transformer.

Background technology:

GIS (Cubicle Gas-Insulated Switchgear) manufacturing plant supports the use in a large number straight-through current transformer on GIS product, in the whole manufacture process of GIS, these current transformers will pass through the process of a series of test, packing, test, general assembly, test.In this process, these current transformers are except meeting the current techique of current transformer requires, the more important thing is will detect in the whole assembling process of GIS whether make current transformer produce performance change or even deteriorated, but also will confirm whether the triphase parameter symmetry of these current transformers meets the demands etc.But in current transformer manufacturing plant, these test jobs have many cannot carrying out, although and GIS manufacturing plant possesses test condition, testing tool often uses the similar discrete instrument with current transformer manufacturing plant, the test job cycle is long and loaded down with trivial details.If can provide a kind of quick and precisely, the test control device for current transformer that the project to be measured requiring all can have been tested of primary connection, will greatly improve the testing efficiency of current transformer.

Summary of the invention:

The object of this invention is to provide a kind of test control device for current transformer.

A kind of test control device for current transformer, wherein: comprise power supply unit, pressure regulation unit, voltage transformation unit, function control unit, volt-ampere characteristic test cell, power frequency proof voltage test cell, megger test unit, the current transformer plug-in unit of plugging into, power supply unit output terminal connects pressure regulation unit, the confession electrical input of function control unit, the output terminal of pressure regulation unit connects the input end of voltage transformation unit, the output terminal of voltage transformation unit connects volt-ampere characteristic test cell, the confession electrical input of power frequency proof voltage test cell, the electrical input that supplies of megger test unit is used for connecting tramegger, the volt-ampere characteristic test control end of function control unit, power frequency proof voltage test control end, megger test control end connect respectively the control signal input end of volt-ampere characteristic test cell, power frequency proof voltage test cell, megger test unit, the current transformer plug-in unit of plugging into comprises plug into connecting terminals fishplate bar and the plug for the each joint of current transformer to be measured of plugging into more, the corresponding connection of respective terminal of web joint and plug, plug is used for being plugged on volt-ampere characteristic test cell or power frequency proof voltage test cell or megger test unit.

Described test control device for current transformer, wherein: what described function control unit comprised the first to the 17 relay, timing relay and the first to the 14 control knob, the 16 control knob, timing relay often drives control knob, zero-location control switch, volt-ampere characteristic test function switch, power frequency proof voltage test function switch, megger test functional switch;

Wherein, the first normally closed contact of the first relay coil and the second relay, first normally closed contact, first of the 3rd relay are often driven control knob in series first and are controlled branch road, and in the first control branch road, the first normal opened contact of the 14 relay is attempted by by the first normally closed contact of the second relay and the first normally closed contact of the 3rd relay and is connected in series the series circuit two ends that form in addition;

The first normally closed contact of the second relay coil and the first relay, second normally closed contact, second of the 3rd relay are often driven control knob in series second and are controlled branch road, and in the second control branch road, the second normal opened contact of the 14 relay is attempted by by the first normally closed contact of the first relay and the second normally closed contact of the 3rd relay and is connected in series the series circuit two ends that form in addition;

The second normally closed contact of the 3rd relay coil and the first relay, the second normally closed contact of the second relay, the 3rd are often driven control knob the in series the 3rd and are controlled branch road, and in the 3rd control branch road, the 3rd normal opened contact of the 14 relay is attempted by by the second normally closed contact of the first relay and the second normally closed contact of the second relay and is connected in series the series circuit two ends that form in addition;

First normally closed contact, the 4th of the 4th relay coil and the 5th relay is often opened the 3rd normal opened contact the in series the 4th of control knob, the first relay and is controlled branch road;

The first normally closed contact, 5 constant virtues of the 5th relay coil and the 4th relay is driven control knob the in series the 5th and is controlled branch road, and the 5th controls branch circuit parallel connection often opens by first normally closed contact, the 4th of the 4th relay coil, the 5th relay the series circuit two ends that control knob forms in the 4th controls branch road;

First normally closed contact, the 6th of the 6th relay coil and the 7th relay is often opened the 3rd normal opened contact the in series the 6th of control knob, the second relay and is controlled branch road;

First normally closed contact, the 7th of the 7th relay coil and the 6th relay is often driven control knob the in series the 7th and is controlled branch road, and the 7th controls branch circuit parallel connection often opens by first normally closed contact, the 6th of the 6th relay coil, the 7th relay the series circuit two ends that control knob forms in the 6th controls branch road;

First normally closed contact, the 8th of the 8th relay coil and the 9th relay is often opened the 3rd normal opened contact the in series the 8th of control knob, the 3rd relay and is controlled branch road;

First normally closed contact, the 9th of the 9th relay coil and the 8th relay is often driven control knob the in series the 9th and is controlled branch road, and the 9th controls branch circuit parallel connection often opens by first normally closed contact, the 8th of the 8th relay coil, the 9th relay the series circuit two ends that control knob forms in the 8th controls branch road;

The tenth relay coil is connected with the functional switch that the 4th normally closed contact, the tenth of the 12 relay is often opened control knob, volt-ampere characteristic test cell, is configured for the tenth of low pressure range voltammetric characteristic measuring control and controls branch road;

The 11 relay coil and the 11 is often driven control knob and is connected, and is configured for the 11 of low pressure expansion voltammetric characteristic measuring control and controls branch road, and the 11 controls the two ends of branch circuit parallel connection the tenth relay coil in the tenth controls branch road;

The 12 relay coil is often driven control knob with the 4th normally closed contact, the 12 of the tenth relay and is connected, be configured for the 12 of high pressure range voltammetric characteristic measuring control and control branch road, the 12 controls branch circuit parallel connection often opens by the 4th normally closed contact, the tenth of the tenth relay coil, the 12 relay the series circuit two ends that control knob forms in the tenth controls branch road;

The 13 relay coil and the 13 is often driven the functional switch the in series the 13 of control knob, power frequency proof voltage test cell and is controlled branch road;

The 4th normally closed contact of timing relay coil and the 16 relay, the 4th normally closed contact of the 12 relay, the 5th normally closed contact of the tenth relay, timing relay are often driven control knob the in series the 14 and are controlled branch road;

The 6th normal opened contact of the 15 relay coil and the tenth relay, the second normal opened contact of the 15 relay, the second normally closed contact of the 16 relay, the time delay control normally closed contact the in series the 15 of timing relay is controlled branch road, the 15 controls the 6th normal opened contact that branch road also comprises the 12 relay, the 4th normal opened contact of the 13 relay, zero-bit is often driven control knob, the 6th normal opened contact of the 12 relay, the 4th normal opened contact of the 13 relay is all connected in parallel on the 6th normal opened contact two ends of the tenth relay, zero-bit is often driven control knob and is connected in parallel on the second normal opened contact two ends of the 15 relay,

The 16 relay coil is connected with the first normal opened contact of the 16 relay and for the 14 normally closed control knob of ann reset control, forms the 16 and controls branch road;

The 17 relay coil be in series for the 16 control knob of controlling current measurement control bridge, form the 17 control branch road;

The 14 relay coil is connected with the functional switch of megger test unit, forms the 18 and controls branch road;

First to the 3rd control branch road, the 4th control branch road, the 6th control branch road, the 8th control branch road, the tenth control branch road, the 13 control branch road, the 14 control branch road, the 15 control branch road, the 16 control branch road, the 17 control branch road, the 18 control branch road respectively with power supply unit form loop.

Described test control device for current transformer, wherein: described pressure regulation unit comprises pressure regulator, the input end of pressure regulator connects power supply unit output terminal, and the output terminal of pressure regulator connects the input end of voltage transformation unit.

Described test control device for current transformer, wherein: described voltage transformation unit comprises the first transformer, the second transformer;

The first end of the first primary winding is by the output terminal of the tenth relay the first normal open switch and the 15 relay the first normal open switch serial connection pressure regulator, the second termination power supply unit common port of the first primary winding; The first end of the first transformer secondary output winding connects the electrical input that supplies of volt-ampere characteristic test cell by the 11 relay the first normal opened contact, the tenth relay the second normal opened contact; The centre tap of the first transformer secondary output winding is by the 11 relay the first normal opened contact described in the 11 relay the second normally closed contact parallel connection; On intermediate contact between the second normal opened contact of the first normal opened contact, the second normally closed contact and the tenth relay of the 11 relay, be connected the first end of low pressure voltammetric characteristic measuring range of voltages table;

The second end of the first transformer secondary output winding is by the tenth relay the 3rd normal opened contact, current measurement control bridge joint ground;

The first end of the second primary winding is connected in series the output terminal of pressure regulator by the first normal opened contact of the 12 relay, the first normal opened contact of the 15 relay, and the first normal opened contact two ends of the 12 relay are also parallel with the first normal opened contact of the 13 relay; The second termination power supply unit common port of the second primary winding;

The first end of the second transformer secondary output winding connects the electrical input that supplies of power frequency proof voltage test cell, and the first end of the second transformer secondary output winding also connects the electrical input that supplies of volt-ampere characteristic test cell by the 3rd normal opened contact of the 12 relay; The first end of the second transformer secondary output winding is also connected with the first end of a winding of voltage transformer (VT), and the Secondary Winding of voltage transformer (VT) and high pressure voltammetric characteristic measuring range of voltages table form loop; The second end of the second transformer secondary output winding is by the second normal opened contact, the current measurement control bridge joint ground of the 12 relay, and the second normal opened contact two ends of the 12 relay are parallel with the second normal opened contact of the 13 relay;

Current measurement control bridge comprises the first normally closed contact of the 17 relay, the second normal opened contact, the 3rd normal opened contact, the 4th normally closed contact, the 3rd normal opened contact of the 13 relay, reometer, the second normal opened contact and the 4th normally closed contact by the 17 relay form series circuit, the first end first via of this series circuit is connected to the second end of the first transformer secondary output winding by the tenth relay the 3rd normal opened contact, first end second tunnel of this series circuit connects the second end of the second transformer secondary output winding by the 12 relay the second normal opened contact, the second end ground connection of this series circuit, the series circuit being made up of the first normally closed contact of the 17 relay and the 3rd normal opened contact of the 17 relay is attempted by the two ends of the series circuit being made up of the second normal opened contact of the 17 relay and the 4th normally closed contact of the 17 relay, the parallel circuit first end that the 3rd normal opened contact of the 13 relay and reometer form is connected on the intermediate contact between the first normally closed contact of the 17 relay and the 3rd normal opened contact of the 17 relay, this parallel circuit second end is connected on the intermediate contact between the second normal opened contact of the 17 relay and the 4th normally closed contact of the 17 relay, intermediate contact between the second normal opened contact of the 17 relay and the 4th normally closed contact of the 17 relay is also connected the second end of low pressure voltammetric characteristic measuring range of voltages table and the second end of a winding of voltage transformer (VT).

Described test control device for current transformer, wherein: described volt-ampere characteristic test cell comprises the first connector, the plug into plug of plug-in unit of the first connector and current transformer is corresponding, the first connector comprises the first to ten joint among three members, first of the first connector, corresponding two links that connect volt-ampere characteristic test cell functional switch of the second connector, the joint among three members of the first connector connects the first end of the 4th relay the second normal opened contact, the 4th connector of the first connector connects the first end of the 5th relay the second normal opened contact, the 6th connector of the first connector connects the first end of the 6th relay the second normal opened contact, the 7th connector of the first connector connects the first end of the 7th relay the second normal opened contact, the 9th connector of the first connector connects the first end of the 8th relay the second normal opened contact, the tenth connector of the first connector connects the first end of the 9th relay the second normal opened contact, the 4th, the 5th, the 6th, the 7th, the 8th, the second end of the 9th relay the second normal opened contact is for connecting the 12 connector of the first connector, the first connector the 5th, the 8th, the 11 connector ground connection, the plug into plug of plug-in unit of current transformer comprises and the first to ten joint among three members first to ten joint among three members one to one of the first connector, plug into first, second connector phase short circuit of plug of plug-in unit of current transformer, current transformer plug into plug-in unit plug the 12, the tenth joint among three members phase short circuit.

Described test control device for current transformer, wherein: described power frequency proof voltage test cell comprises the second connector, the plug into plug of plug-in unit of the second connector and current transformer is corresponding; The second connector comprises the first to ten joint among three members, corresponding two links that connect power frequency proof voltage test cell functional switch of first, second connector of the second connector, the 3rd to the 12 connector phase short circuit of the second connector; The plug into plug of plug-in unit of current transformer comprises and the first to ten joint among three members first to ten joint among three members one to one of the second connector, plug into first, second connector phase short circuit of plug of plug-in unit of current transformer, current transformer plug into plug-in unit plug the 12, the tenth joint among three members phase short circuit.

Described test control device for current transformer, wherein: described megger test unit comprises the 3rd connector, the plug into plug of plug-in unit of the 3rd connector and current transformer is corresponding, the 3rd connector comprises the first to ten joint among three members, first of the 3rd connector, corresponding two links that connect megger test Elementary Function switch of the second connector, the joint among three members of the 3rd connector connects the first end of the first relay the 4th normally closed contact, the 6th connector of the 3rd connector connects the first end of the second relay the 4th normally closed contact, the 9th connector of the 3rd connector connects the first end of the 3rd relay the 4th normally closed contact, the second end of the 4th normally closed contact of the first relay, the second end of the 4th normally closed contact of the second relay, the equal ground connection of the second end of the 4th normally closed contact of the 3rd relay, the 5th normal opened contact first end of the first relay, the second relay the 5th normal opened contact first end, the 3rd relay the 5th normal opened contact first end is all connected in the 12 connector of the 3rd connector, the 5th normal opened contact the second end of the first relay connects respectively the 3rd of the 3rd connector, the 4th, the 5th connector, the 5th normal opened contact the second end of the second relay connects respectively the 6th of the 3rd connector, the 7th, the 8th connector, the 5th normal opened contact the second end of the 3rd relay connects respectively the 9th of the 3rd connector, the tenth, the 11 connector, the tenth joint among three members of the 3rd connector is used for connecting tramegger, the plug into plug of plug-in unit of current transformer comprises and the first to ten joint among three members first to ten joint among three members one to one of the 3rd connector, plug into first, second connector phase short circuit of plug of plug-in unit of current transformer, current transformer plug into plug-in unit plug the 12, the tenth joint among three members phase short circuit.

Described test control device for current transformer, wherein: described test control device for current transformer also comprises over-current protecting unit, over-current protecting unit comprises overcurrent protection relay and current surveillance table; The coil of overcurrent protection relay and current surveillance table and current measurement control bridge are in series, and the first normal opened contact of overcurrent protection relay is connected in parallel on the first normal opened contact two ends of the 16 relay in the control of the 16 in function control unit branch road.

Described test control device for current transformer, wherein: this test control device for current transformer also comprises reports to the police and indicating member, and warning and indicating member comprise:

The first instruction branch road, comprises power light;

The second instruction branch road, drives control knob by stroboscopic lamp and the tenth 5 constant virtues in series;

The 3rd instruction branch road, in series by the 6th normal opened contact of the 3rd pilot lamp and the first relay;

The 4th instruction branch road, in series by the 3rd normal opened contact of the 4th pilot lamp and the 4th relay;

The five fingers show branch road, in series by the 3rd normal opened contact of the 5th pilot lamp and the 5th relay;

The 6th instruction branch road, in series by the 6th normal opened contact of the 6th pilot lamp and the second relay;

The 7th instruction branch road, in series by the 3rd normal opened contact of the 7th pilot lamp and the 6th relay;

The 8th instruction branch road, in series by the 3rd normal opened contact of the 8th pilot lamp and the 7th relay;

The 9th instruction branch road, in series by the 6th normal opened contact of the 9th pilot lamp and the 3rd relay;

The tenth instruction branch road, in series by the 3rd normal opened contact of the tenth pilot lamp and the 8th relay;

The 11 instruction branch road, in series by the 3rd normal opened contact of the 11 pilot lamp and the 9th relay;

The 12 instruction branch road, in series by the 7th normal opened contact of the 12 pilot lamp and the tenth relay;

The 13 instruction branch road, in series by the 3rd normal opened contact of the 13 pilot lamp and the 11 relay;

The 14 instruction branch road, in series by the 7th normal opened contact of the 14 pilot lamp and the 12 relay;

The tenth the five fingers show branch road, in series by the 5th normal opened contact of the 15 pilot lamp and the 13 relay;

The 16 instruction branch road, in series by the 4th normal opened contact of the 16 pilot lamp and the 14 relay;

The 17 instruction branch road, in series by the 3rd normal opened contact of the 17 pilot lamp and the 15 relay;

The 18 instruction branch road, in series by the 5th normal opened contact of the 18 pilot lamp and the 16 relay;

The 19 instruction branch road, in series by the 5th normal opened contact of the 19 pilot lamp and the 17 relay;

The 20 warning branch road, in series by the 3rd normal opened contact of alarm and the 16 relay.

The present invention will reach following technique effect after adopting technique scheme:

Test control device for current transformer of the present invention many current transformers of can simultaneously plugging into, every current transformer can be multitap, only need primary connection, just can carry out many, multitap test job to current transformer, the switching of target current mutual inductor, target tap no longer needs manual change measurement circuit continually, only need in function control unit, carry out simple button switches, compare with traditional testing apparatus, save the plenty of time, and avoided the lead to errors possibility of wiring of frequent reconfiguration line, in addition, the field voltage of test control device for current transformer of the present invention possesses multistage output, the current transformer using in GIS is according to different size, only tens volts sometimes of field voltages in volt-ampere characteristic test, sometimes reach thousands of volts, when the current transformer that uses traditional measurement device to differ greatly to these field voltage levels is measured, if in order to make pressure regulation manipulation, the values of reading etc. are convenient, accurately, the equipment that need to change back and forth different size is (as pressure regulator, transformer, instrument etc.), use test control device for current transformer of the present invention, in the time running into the different current transformer of field voltage level, more exchange device (pressure regulator, transformer, instrument etc.), only need in function control unit, select Voltage-output height gear, can make pressure regulator etc. work in better manipulation, in read range, test control device for current transformer of the present invention is applicable to height simultaneously, low-impedance current transformer test, in traditional measurement, high, low-impedance current transformer is all to adopt same test loop conventionally, the measurement of field voltage (or electric current) may produce larger deviation sometimes, test control device for current transformer of the present invention is designed with two kinds of voltammetric characteristic measuring loops, correspond respectively to height, low-impedance current transformer, to improve as much as possible the measuring accuracy of field voltage (and electric current), and design height, low impedance current transformer test loop simple, translation function fast, one key can switch, needn't manual change circuit.Test control device for current transformer of the present invention possesses the functions such as voltammetric characteristic measuring, power frequency proof voltage, insulation measurement, these functions are except carrying out repetition measurement confirmation some characteristics of current transformer, the later stage problem that more can occur in transport, the packing of GIS factory and total process of assembling current transformer is screened confirmation, as the closed-loop path problem occurring in general assembly, meanwhile, between out-phase, the symmetry of current transformer performance also can be differentiated fast.While carrying out insulation measurement, by test control device for current transformer of the present invention each terminal of short circuit current mutual inductor rapidly, and can select rapidly relatively or carry out relatively mutually insulation measurement.In addition, test control device for current transformer of the present invention also has zero position protection function, possesses excess current warning, defencive function, possesses proof voltage timing function; Test control device for current transformer of the present invention is adapted to the current transformer test of GIS manufacturing plant and has feature in enormous quantities, mobility, and the feature of many current transformers of once can plugging into makes it be specially adapted to large batch of current transformer test.Test control device for current transformer of the present invention is compact to design small and exquisite, can move to easily another place from a place and use.In sum, test control device for current transformer of the present invention have test quick and precisely, primary connection can all test the project to be measured requiring, and greatly improved the testing efficiency of batch type current transformer.

Brief description of the drawings:

Fig. 1 is the structural principle block diagram of test control device for current transformer of the present invention;

Fig. 2 is the circuit theory diagrams of test control device for current transformer of the present invention;

Fig. 3 is the scheme of installation that stacks that uses the current transformer to be measured tested of test control device for current transformer of the present invention;

Fig. 4 is the principle sketch of high and low impedance current transformer measuring circuit when circuit theory diagrams carry out volt-ampere characteristic test described in Fig. 2;

Fig. 5 utilizes circuit shown in Fig. 2 to carry out the schematic diagram of current transformer closed-loop path inspection.

Embodiment:

Test control device for current transformer of the present invention, as shown in Figure 1: comprise power supply unit, pressure regulation unit, voltage transformation unit, function control unit, volt-ampere characteristic test cell, power frequency proof voltage test cell, megger test unit, the current transformer plug-in unit of plugging into, over-current protecting unit, report to the police and indicating member, power supply unit output terminal connects pressure regulation unit, the confession electrical input of function control unit, the output terminal of pressure regulation unit connects the input end of voltage transformation unit, the output terminal of voltage transformation unit connects volt-ampere characteristic test cell, the confession electrical input of power frequency proof voltage test cell, the electrical input that supplies of megger test unit is used for connecting tramegger, the volt-ampere characteristic test control end of function control unit, power frequency proof voltage test control end, megger test control end connect respectively the control signal input end of volt-ampere characteristic test cell, power frequency proof voltage test cell, megger test unit, the current transformer plug-in unit of plugging into comprises plug into connecting terminals fishplate bar and the plug for the each joint of current transformer to be measured of plugging into more, the corresponding connection of respective terminal of web joint and plug, plug is used for being plugged on volt-ampere characteristic test cell or power frequency proof voltage test cell or megger test unit.

Over-current protecting unit is connected on the current return of volt-ampere characteristic test cell, power frequency proof voltage test cell; judge whether the electric current passing through exceedes predefined lowest high-current value; if exceeded; over-current protecting unit sends over-current signal to function control unit; quit work by the power-off of function control unit control voltage transformation unit; with protection late-class circuit, meanwhile, function control unit control warning and indicating member are reported to the police and are indicated.

Fig. 2 is the circuit theory diagrams of test control device for current transformer of the present invention: described function control unit comprises that first to the 17 relay K 1～K17, timing relay KT and first to the 14 control knob SB1～SB14, the 16 control knob SB16, timing relay KT's often opens control knob KT-2, zero-location control switch S Q, volt-ampere characteristic test function switch RE1-1, power frequency proof voltage test function switch RE2-1, megger test functional switch RE3-1;

Wherein, the first normally closed contact K2-1 of the first relay K 1 coil and the second relay K 2, the first normally closed contact K3-1, first of the 3rd relay K 3 often open control knob SB1 in series first and control branch road, and in the first control branch road, the first normal opened contact K14-1 of the 14 relay K 14 is attempted by by the first normally closed contact K2-1 of the second relay K 2 and the first normally closed contact K3-1 of the 3rd relay K 3 and is connected in series the series circuit two ends that form in addition;

The first normally closed contact K1-1 of the second relay K 2 coils and the first relay K 1, the second normally closed contact K3-2, second of the 3rd relay K 3 often open control knob SB2 in series second and control branch road, and in the second control branch road, the second normal opened contact K14-2 of the 14 relay K 14 is attempted by by the first normally closed contact K1-1 of the first relay K 1 and the second normally closed contact K3-2 of the 3rd relay K 3 and is connected in series the series circuit two ends that form in addition;

The second normally closed contact K1-2 of the 3rd relay K 3 coils and the first relay K 1, the second normally closed contact K2-2, the 3rd of the second relay K 2 often open control knob SB3 the in series the 3rd and control branch road, and in the 3rd control branch road, the 3rd normal opened contact K14-3 of the 14 relay K 14 is attempted by by the second normally closed contact K1-2 of the first relay K 1 and the second normally closed contact K2-2 of the second relay K 2 and is connected in series the series circuit two ends that form in addition;

The 3rd normal opened contact K1-3 the in series the 4th that the first normally closed contact K5-1, the 4th of the 4th relay K 4 coils and the 5th relay K 5 often opens control knob SB4, the first relay K 1 controls branch road;

The first normally closed contact K4-1,5 constant virtues of the 5th relay K 5 coils and the 4th relay K 4 is opened control knob SB5 the in series the 5th and is controlled branch road, and the 5th controls branch circuit parallel connection often opens by the first normally closed contact K5-1, the 4th of the 4th relay K 4 coils, the 5th relay K 5 the series circuit two ends that control knob SB4 forms in the 4th controls branch road;

The 3rd normal opened contact K2-3 the in series the 6th that the first normally closed contact K7-1, the 6th of the 6th relay K 6 coils and the 7th relay K 7 often opens control knob SB6, the second relay K 2 controls branch road;

The first normally closed contact K6-1, the 7th of the 7th relay K 7 coils and the 6th relay K 6 often opens control knob SB7 the in series the 7th and controls branch road, and the 7th controls branch circuit parallel connection often opens by the first normally closed contact K7-1, the 6th of the 6th relay K 6 coils, the 7th relay K 7 the series circuit two ends that control knob SB6 forms in the 6th controls branch road;

The 3rd normal opened contact K3-3 the in series the 8th that the first normally closed contact K9-1, the 8th of the 8th relay K 8 coils and the 9th relay K 9 often opens control knob SB8, the 3rd relay K 3 controls branch road;

The first normally closed contact K8-1, the 9th of the 9th relay K 9 coils and the 8th relay K 8 often opens control knob SB9 the in series the 9th and controls branch road, and the 9th controls branch circuit parallel connection often opens by the first normally closed contact K9-1, the 8th of the 8th relay K 8 coils, the 9th relay K 9 the series circuit two ends that control knob SB8 forms in the 8th controls branch road;

The tenth relay K 10 coils are connected with the functional switch RE1-1 that the 4th normally closed contact K12-4, the tenth of the 12 relay K 12 often opens control knob SB10, volt-ampere characteristic test cell, are configured for the tenth of low pressure range voltammetric characteristic measuring control and control branch road;

The 11 relay K 11 coils and the 11 are often opened control knob SB11 and are connected, and are configured for the 11 of low pressure expansion voltammetric characteristic measuring control and control branch road, and the 11 controls the two ends of branch circuit parallel connection the tenth relay K 10 coils in the tenth controls branch road;

The 12 relay K 12 coils are often opened control knob SB12 with the 4th normally closed contact K10-4, the 12 of the tenth relay K 10 and are connected, be configured for the 12 of high pressure range voltammetric characteristic measuring control and control branch road, the 12 controls branch circuit parallel connection often opens by the 4th normally closed contact K12-4, the tenth of the tenth relay K 10 coils, the 12 relay K 12 the series circuit two ends that control knob SB10 forms in the tenth controls branch road;

The functional switch RE2-1 the in series the 13 that the 13 relay K 13 coils and the 13 are often opened control knob SB13, power frequency proof voltage test cell controls branch road;

The control knob KT-2 the in series the 14 that often opens of the 5th normally closed contact K10-5, the timing relay KT of the 4th normally closed contact K16-4 of timing relay KT coil and the 16 relay K 16, the 4th normally closed contact K12-4 of the 12 relay K 12, the tenth relay K 10 controls branch road;

The 6th normal opened contact K10-6 of the 15 relay K 15 coils and the tenth relay K 10, the second normal opened contact K15-2 of the 15 relay K 15, the second normally closed contact K16-2 of the 16 relay K 16, the time delay control normally closed contact KT-1 the in series the 15 of timing relay KT controls branch road, the 15 controls the 6th normal opened contact K12-6 that branch road also comprises the 12 relay K 12, the 4th normal opened contact K13-4 of the 13 relay K 13, zero-bit is often opened control knob SQ, the 6th normal opened contact K12-6 of the 12 relay K 12, the 4th normal opened contact K13-4 of the 13 relay K 13 is all connected in parallel on the 6th normal opened contact K10-6 two ends of the tenth relay K 10, zero-bit is often opened control knob SQ and is connected in parallel on the second normal opened contact K15-2 two ends of the 15 relay K 15,

The 16 relay K 16 coils are connected with the first normal opened contact K16-1 of the 16 relay K 16 and for the 14 normally closed control knob SB14 of ann reset control, form the 16 and control branch road;

The 17 relay K 17 coils be in series for the 16 control knob SB16 that controls current measurement control bridge, form the 17 control branch road;

The 14 relay K 14 coils are connected with the functional switch RE3-1 of megger test unit, form the 18 and control branch road;

Described pressure regulation unit comprises pressure regulator T1, and the input end of pressure regulator T1 connects power supply unit output terminal, and the output terminal of pressure regulator T1 connects the input end of voltage transformation unit.

Described voltage transformation unit comprises the first transformer T2, the second transformer T3; The first end of the first transformer T2 armature winding is by the output terminal of the first normal open switch K10-1 of the tenth relay K 10 and the first normal open switch K15-1 serial connection pressure regulator T1 of the 15 relay K 15, and first the second end of transformer T2 armature winding and the zero line of power supply unit form loop; The first end of the first transformer T2 secondary winding connects confession electrical input 13 pin of volt-ampere characteristic test cell RE1 by the first normal opened contact K11-1 of the 11 relay K 11, the second normal opened contact K10-2 of the tenth relay K 10; The centre tap of the first transformer T2 secondary winding is by the first normal opened contact K11-1 of the 11 relay K 11 described in the second normally closed contact K11-2 parallel connection of the 11 relay K 11; On intermediate contact between the first normal opened contact K11-1 of the 11 relay K 11 and the second normally closed contact K11-2 and the second normal opened contact K10-2 of the tenth relay K 10, be connected the first end of low pressure voltammetric characteristic measuring range of voltages Table X V2;

The second end of the first transformer T2 secondary winding is by the tenth relay K 10 the 3rd normal opened contact K10-3, current measurement control bridge joint ground;

The first end of the second transformer T3 armature winding is connected in series the output terminal of pressure regulator T1 by the first normal opened contact K12-1 of the 12 relay K 12, the first normal opened contact K15-1 of the 15 relay K 15, and the first normal opened contact K12-1 two ends of the 12 relay K 12 are also parallel with the first normal opened contact K13-1 of the 13 relay K 13; The zero line that the second end of the second transformer T3 armature winding connects power supply unit forms loop;

The first end of the second transformer T3 secondary winding connect power frequency proof voltage test cell RE2 for electrical input 13 pin, the first end of the second transformer T3 secondary winding also by the 3rd normal opened contact K12-3 of the 12 relay K 12 connect volt-ampere characteristic test cell RE1 for electrical input 13 pin; The first end of the second transformer T3 secondary winding is also connected with the first end of a winding of voltage transformer pt, the Secondary Winding of voltage transformer pt and high pressure voltammetric characteristic measuring range of voltages Table X V1 form loop, and (the Secondary Winding two ends of voltage transformer pt are also parallel with the voltage table V2 for high-voltage test, and voltage table V2 directly shows the primary voltage of voltage transformer pt in kilovolt mode; Voltage table XV1 is for volt-ampere characteristic test, the voltage table of high pressure voltammetric characteristic measuring scope, have multiple ranges available, to lie prostrate the secondary voltage that shows voltage transformer pt as unit, and be mean voltmeter.); The second end of the second transformer T3 secondary winding is by the second normal opened contact K12-2, the current measurement control bridge joint ground of the 12 relay K 12, and the second normal opened contact K12-2 two ends of the 12 relay K 12 are parallel with the second normal opened contact K13-2 of the 13 relay K 13;

Current measurement control bridge comprises the first normally closed contact K17-1 of the 17 relay K 17, the second normal opened contact K17-2, the 3rd normal opened contact K17-3, the 4th normally closed contact K17-4, the 3rd normal opened contact K17-3 of the 13 relay K 13, reometer XA1, the second normal opened contact K17-2 and the 4th normally closed contact K17-4 by the 17 relay K 17 form series circuit, its one end is respectively by the tenth relay K 10 the 3rd normal opened contact K10-3 and the 12 relay K 12 second normal opened contact K12-2, be connected to the second end of the first transformer T2 secondary winding and the second end of the second transformer T3 secondary winding, other end ground connection, the series circuit being made up of the first normally closed contact K17-1 and the 3rd normal opened contact K17-3 of the 17 relay K 17 is attempted by the two ends of the series circuit being made up of the second normal opened contact K17-2 and the 4th normally closed contact K17-4, circuit one end after the 3rd normal opened contact K13-3 of the 13 relay K 13 is in parallel with reometer XA1 is connected on the intermediate contact between the first normally closed contact K17-1 and the 3rd normal opened contact K17-3 of the 17 relay K 17, the other end is connected on the intermediate contact between the second normal opened contact K17-2 and the 4th normally closed contact K17-4 of the 17 relay K 17, intermediate contact between the second normal opened contact K17-2 and the 4th normally closed contact K17-4 of the 17 relay K 17 is also connected the second end of low pressure voltammetric characteristic measuring range of voltages Table X V2 and the second end of a winding of voltage transformer pt.

Described over-current protecting unit comprises overcurrent protection relay KA and current surveillance Table A 1; The coil of overcurrent protection relay KA and current surveillance Table A 1 are in series with current measurement control bridge, and the first normal opened contact KA-1 of overcurrent protection relay KA is connected in parallel on the first normal opened contact K16-1 two ends of the 16 relay K 16 in the control of the 16 in function control unit branch road.

Described warning and indicating member comprise:

The first instruction branch road, comprises power light L1;

The second instruction branch road, opens control knob SB15 by stroboscopic lamp L2 and the tenth 5 constant virtues in series; (stroboscopic lamp L2 only plays warning function, while test, can open stroboscopic lamp L2 in Special test district; In the time that test in the numerous and diverse non-Special test district of personnel, can open stroboscopic lamp warning personnel around.)

The 3rd instruction branch road, in series by the 6th normal opened contact K1-6 of the 3rd pilot lamp L3 and the first relay K 1;

The 4th instruction branch road, in series by the 3rd normal opened contact K4-3 of the 4th pilot lamp L4 and the 4th relay K 4;

The five fingers show branch road, in series by the 3rd normal opened contact K5-3 of the 5th pilot lamp L5 and the 5th relay K 5;

The 6th instruction branch road, in series by the 6th normal opened contact K2-6 of the 6th pilot lamp L6 and the second relay K 2;

The 7th instruction branch road, in series by the 3rd normal opened contact K6-3 of the 7th pilot lamp L7 and the 6th relay K 6;

The 8th instruction branch road, in series by the 3rd normal opened contact K7-3 of the 8th pilot lamp L8 and the 7th relay K 7;

The 9th instruction branch road, in series by the 6th normal opened contact K3-6 of the 9th pilot lamp L9 and the 3rd relay K 3;

The tenth instruction branch road, in series by the 3rd normal opened contact K8-3 of the tenth pilot lamp L10 and the 8th relay K 8;

The 11 instruction branch road, in series by the 3rd normal opened contact K9-3 of the 11 pilot lamp L11 and the 9th relay K 9;

The 12 instruction branch road, in series by the 7th normal opened contact K10-7 of the 12 pilot lamp L12 and the tenth relay K 10;

The 13 instruction branch road, in series by the 3rd normal opened contact K11-3 of the 13 pilot lamp L13 and the 11 relay K 11;

The 14 instruction branch road, in series by the 7th normal opened contact K12-7 of the 14 pilot lamp L14 and the 12 relay K 12;

The tenth the five fingers show branch road, in series by the 5th normal opened contact K13-5 of the 15 pilot lamp L15 and the 13 relay K 13;

The 16 instruction branch road, in series by the 4th normal opened contact K14-4 of the 16 pilot lamp L16 and the 14 relay K 14;

The 17 instruction branch road, in series by the 3rd normal opened contact K15-3 of the 17 pilot lamp L17 and the 15 relay K 15;

The 18 instruction branch road, in series by the 5th normal opened contact K16-5 of the 18 pilot lamp L18 and the 16 relay K 16;

The 19 instruction branch road, in series by the 5th normal opened contact K17-5 of the 19 pilot lamp L19 and the 17 relay K 17;

The 20 warning branch road, in series by the 3rd normal opened contact K16-3 of alarm DL and the 16 relay K 16.

Described volt-ampere characteristic test cell comprises the first connector RE1, and the plug into plug TB2 of plug-in unit TB of the first connector RE1 and current transformer is corresponding, the first connector RE1 comprises the first to ten joint among three members 1～13, first of the first connector RE1, the second connector 1, 2 corresponding two links that connect volt-ampere characteristic test cell functional switch RE1-1, the joint among three members 3 of the first connector RE1 connects the first end of the 4th relay K 4 second normal opened contact K4-2, the 4th connector 4 of the first connector RE1 connects the first end of the 5th relay K 5 second normal opened contact K5-2, the 6th connector 6 of the first connector RE1 connects the first end of the 6th relay K 6 second normal opened contact K6-2, the 7th connector 7 of the first connector RE1 connects the first end of the 7th relay K 7 second normal opened contact K7-2, the 9th connector 9 of the first connector RE1 connects the first end of the 8th relay K 8 second normal opened contact K8-2, the tenth connector 10 of the first connector RE1 connects the first end of the 9th relay K 9 second normal opened contact K9-2, the 4th relay K 4 second normal opened contact K4-2, the 5th relay K 5 second normal opened contact K5-2, the 6th relay K 6 second normal opened contact K6-2, the 7th relay K 7 second normal opened contact K7-2, the 8th relay K 8 second normal opened contact K8-2, the second end of the 9th relay K 9 second normal opened contact K9-2 is for connecting the 12 connector 12 of the first connector RE1, the first connector RE1 the 5th, the 8th, the 11 connector 5,8,11 ground connection.

Described power frequency proof voltage test cell comprises the second connector RE2, and the plug into plug TB2 of plug-in unit TB of the second connector RE2 and current transformer is corresponding; The second connector RE2 comprises the first to ten joint among three members 1～13, corresponding two links that connect power frequency proof voltage test cell functional switch RE2-1 of first,

second connector

1,2 of the second connector RE2, the 3rd to the 12 connector 3～12 phase short circuits of the second connector RE2.

Described megger test unit comprises the 3rd connector RE3, and the plug into plug of plug-in unit of the 3rd connector RE3 and current transformer is corresponding, the 3rd connector RE3 comprises the first to ten joint among three members, first of the 3rd connector RE3, the second connector 1, 2 corresponding two links that connect megger test Elementary Function switch RE3-1, the joint among three members of the 3rd connector RE3 connects the first end of the first relay K 1 the 4th normally closed contact, the 6th connector of the 3rd connector RE3 connects the first end of the second relay K 2 the 4th normally closed contact, the 9th connector of the 3rd connector RE3 connects the first end of the 3rd relay K 3 the 4th normally closed contact, the second end of the 4th normally closed contact of the first relay K 1, the second end of the 4th normally closed contact of the second relay K 2, the equal ground connection of the second end of the 4th normally closed contact of the 3rd relay K 3, the 5th normal opened contact first end of the first relay K 1, the second relay K 2 the 5th normal opened contact first end, the 3rd relay K 3 the 5th normal opened contact first end is all connected in the 12 connector of the 3rd connector RE3, the 5th normal opened contact the second end of the first relay K 1 connects respectively the 3rd of the 3rd connector RE3, the 4th, the 5th connector, the 5th normal opened contact the second end of the second relay K 2 connects respectively the 6th of the 3rd connector RE3, the 7th, the 8th connector, the 5th normal opened contact the second end of the 3rd relay K 3 connects respectively the 9th of the 3rd connector RE3, the tenth, the 11 connector, the tenth joint among three members of the 3rd connector RE3 is used for connecting tramegger.

The plug into plug TB2 of plug-in unit TB of current transformer comprises and all the first to ten joints among three members 1～13 one to one of the first to ten joint among three members 1～13 of the first connector RE1, the second connector RE2, the 3rd connector RE3, plug into first,

second connector

1,2 phase short circuits of plug TB2 of plug-in unit TB of current transformer, current transformer plug into plug-in unit TB plug TB2 the 12, the tenth joint among three members 12,13 phase short circuits.Current transformer is plugged into the plug TB2 of plug-in unit TB while being plugged on corresponding connector, plug into 1,2 pin of plug TB2 of plug-in unit TB of current transformer make the functional switch closure of corresponding connector, meanwhile, make the connector 12 and its connector 13 phase short circuits for electric energy input of corresponding connector.

The plug into web joint TB1 of plug-in unit TB of current transformer has multiple terminals of plugging into, in the present embodiment, 3rd～11 plug into terminal for connecting the terminal of plugging into of current transformer to be measured, 1st, 2 plug into and between terminal, be connected with voltage table V3, the effect of voltage table V3 is to confirm current transformer closed-loop path, the J terminal of web joint TB1 is used for connecting tramegger, E terminal ground connection.

Respectively taking volt-ampere characteristic (excitation property) measurement, power frequency proof voltage, insulation measurement as example, the course of work of test control device for current transformer of the present invention is described respectively below:

Taking the test of the A shown in Fig. 3, B, C threephase current transformer as example, the A shown in Fig. 3, B, the every phase of C threephase current transformer are all that 3 current transformers stack installation below, and wherein how tapped some current transformer be.

As shown in Figure 2, current transformer is plugged into many group current transformers terminal of plugging into is set on the web joint TB1 of plug-in unit, can test many current transformers; If every current transformer is with tapped words, centre tap also can connect and test simultaneously.

Plug into terminal 1S3,1S2, the 1S1 of the phase of A shown in Fig. 3 No.1 current transformer are received to 3,4, No. 5 binding posts that current transformer in Fig. 2 is plugged on the web joint TB1 of plug-in unit; Equally, plug into terminal 1S3, the 1S2 of the No.1 current transformer of B phase,

1S1

6,7, No. 8 binding posts on fishplate bar TB1 in succession respectively, plug into terminal 1S3, the 1S2 of the No.1 current transformer of C phase, 1S1 9,10,11 binding posts on fishplate bar TB1 in succession respectively.

The J terminal that current transformer is plugged on the web joint TB1 of plug-in unit is for connecting tramegger, to carry out insulation measurement; The system earth (as the grounding parts that connect current transformer casing, GIS on grade) of the E terminal that current transformer is plugged on the web joint TB1 of plug-in unit when working.

1, volt-ampere characteristic (excitation property) test:

The plug into plug TB2 of plug-in unit of current transformer is inserted on the first connector RE1 of volt-ampere characteristic test cell, current transformer plug into plug-in unit plug

TB2

1, 2 pin make functional switch (seeing the tenth control branch road of the function control unit) closure of the first connector RE1, function control unit is in excitation characteristic test state, allow by the tenth control knob SB10 (being the low pressure range of 0～250V in the present embodiment), the 11 control knob SB11 (being the low pressure spreading range of 0～750V in the present embodiment), the 12 control knob SB12 (being the high pressure range of 0～3000V in the present embodiment) selects the field voltage scope that will export.

The plug into effect of 13,12 pin of plug TB2 of plug-in unit of current transformer is that the field voltage of the first transformer T2 (or second transformer T3) output is guided into plug into 3～11 pin (being current transformer) of plug TB2 of plug-in unit of current transformer by the first connector RE1 of volt-ampere characteristic test cell.

Carry out the test of A phase No.1 current transformer, closed the first control knob SB1 and the 5th control knob SB5, the first relay K 1 and the 5th relay K 5 are moved, and now, current transformer is plugged on the web joint TB1 of plug-in unit only has S1, the S2 of A phase No.1 current transformer to be access in test loop; If that closed is the first control knob SB1 and the 4th control knob SB4, the first relay K 1 and the 4th relay K 4 are moved so, and plug into terminal 1S1, the 1S3 of A phase No.1 current transformer are access in test loop.

Following table 1 shows the Access Control condition of the each terminal of No.1 current transformer:

Ten, 11,12 control knob SB10, SB11, SB12 are ' low pressure ', ' low pressure expansion ', ' high pressure ' syllogic voltage range selector switch, not only facilitated the current transformer that field voltage level is different test, but also ensured the precision of field voltage in gamut.

In test process, when tested current transformer need to be very low field voltage time, closed the tenth control knob SB10, the tenth relay K 10 is moved, the first transformer T2 drops into as output transformer, and the centre tap of the first transformer T2 (250V tap) output 0～250V adds to 13 pin of volt-ampere characteristic test cell the first connector RE1 as the field voltage of current transformer.

In the time that tested current transformer needs higher field voltage, first closed the tenth control knob SB10, more closed the 11 control knob SB11, the 11 relay K 11 is moved, and first transformer T2 output 0～750V is as the field voltage of current transformer.

If the excitation level of tested current transformer is very high, closed the 12 control knob SB12, the 12 relay K 12 is moved, the second transformer T3 drops in test loop as output transformer, provide higher field voltage by it for current transformer, add to 13 pin of the first connector RE1 of volt-ampere characteristic test cell.

The feature of the transformer sectional formula output field voltage of the different no-load voltage ratios of above-mentioned utilization, make this device in the time of the current transformer in the face of different exciting level, prime pressure regulator T1 can work in comparatively ideal trip segment all the time, makes the output of low excitation and high field voltage and regulate to obtain stablizing and being easy to the effect of controlling.For example, in the time that needs are exported very low field voltage, select " low pressure " shelves, just there will not be pressure regulator T1 slightly to rotate, field voltage is difficult for the phenomenon of meticulous control with regard to significantly changing.

While carrying out excitation characteristic test, in order to obtain field voltage (or electric current) value accurately, for the very large or very little current transformer of impedance, voltage table, reometer summation current transformer three's annexation should adopt different forms, the test loop principle sketch of high impedance current mutual inductor as shown in Figure 4 a, Fig. 4 b is depicted as the test loop principle sketch of low impedance current mutual inductor, it is high that the 17 relay K 17 in Fig. 2 plays switching, the effect in low impedance current transformer test loop, press the 16 control knob SB16, the 17 relay K 17 is moved, in Fig. 2, voltage measuring instrument XV1 (or XV2) and current instruments XA1 and current transformer are plugged into the circuit connecting relation of these three elements of web joint TB1 (being current transformer) of plug-in unit as shown in Fig. 4 a, form high impedance current transformer test loop, disconnect the 16 control knob SB16, the 17 relay K 17 is failure to actuate, the plug into circuit connecting relation of these three elements of web joint TB1 (being current transformer) of plug-in unit of high pressure range voltage measuring instrument XV1 (or low pressure range voltage measuring instrument XV2) and current instruments XA1 and current transformer is anticipated as shown in Figure 4 b, convert the loop of low impedance current transformer test shown in Fig. 4 b to, be applicable to low-impedance current transformer test, voltage measuring instrument XV2 and the current instruments XA1 of the voltage measuring instrument XV1 of high pressure range or low pressure (and low pressure expansion) scope are used for respectively measuring field voltage and exciting current.Note, the voltage measuring instrument XV1 of high pressure range accesses loop by voltage transformer pt, in the time understanding this circuit form, voltage transformer pt can be equivalent to voltage table XV1.

2, power frequency proof voltage

When current transformer is plugged into the plug TB2 of plug-in unit while inserting in the second connector RE2 of power frequency proof voltage test cell, plug into 1,2 pin of plug TB2 of plug-in unit of current transformer make the second connector RE2 functional switch (see function control unit the 13 control branch road) closure, and function control unit is in voltage-withstand test state.

The plug into effect of 13,12 pin of plug TB2 of plug-in unit of current transformer is that the power-frequency voltage of the second transformer T3 output is guided into plug into 3～11 pin (finally arriving the corresponding terminal of plugging into of current transformer) of plug TB2 of plug-in unit of current transformer by the second connector RE2 of power frequency proof voltage test cell, and 3～12 pin of the second connector RE2 of power frequency proof voltage test cell are shorted together, that is to say, each terminal short circuit of each current transformer to be measured is being applied in power-frequency voltage after together and carrying out current transformer proof voltage over the ground.

Closed the 13 control knob SB13, the 13 relay K 13 is moved, and the second transformer T3 drops in withstand voltage loop as output transformer, and the output voltage of the second transformer T3 adds to 13 pin of the second connector RE2 of power frequency proof voltage test cell.

Meanwhile, the current terminal of current instruments XA1 is by the 3rd normal opened contact short circuit of the 13 relay K 13, and current instruments XA1 is bypassed in proof voltage test mode, so that it is protected.

When the voltage that regulates pressure regulator T1 to make to be applied on current transformer to be measured reaches after required voltage value, press the 14 control timing relay KT in branch road often open control knob KT-2, timing relay KT starts timing, in the time that the time of setting arrives, timing relay KT action, the 15 controls the coil losing electricity of the relay K 15 in branch road, the loop between cutting-off pressure-regulating device T1 and rear class the second transformer T3 thus, and proof voltage has been tested.

Clocking capability is designed to only effective to proof voltage test loop.Measure for aforementioned excitation property, no matter when closed the tenth control knob SB10 or the 12 control knob SB12, the tenth relay K the 10 or the 12 relay K 12 all can be cut off timing relay KT branch road, and clocking capability can not be had an effect.

For experimental safe, no matter carry out excitation property measurement or proof voltage, while starting to test, need first by zero-location control button SQ closure, only has pressure regulator T1 in zero-bit state, could be the tenth, 12, when 13 relay K 10, K12, the action of K13 thrin, make the 15 relay K 15 move and enter self-locking state, pressure regulator T1 and rear class circuit communication are got up.

No matter carry out excitation characteristic test or proof voltage test, for protective current mutual inductor plug into current transformer and this test control device for current transformer itself of connecting on plug-in unit, in test, as long as main circuit current has met or exceeded the setting valve of overcurrent protection relay KA before test, will make overcurrent protection relay KA action, therefore make the 16 relay K 16 action self-lockings, and then make the 15 relay K 15 dead electricity, pressure regulator T1 and rear class loop disconnect, send respectively sound with the 18 pilot lamp L18 in the alarm DL in the 20 warning branch road in alarm and indicating member and the 18 instruction branch road, light is reported to the police.

The 16 the 14 control knob SB14 controlling in branch road is used for the 16 relay K 16 in self-locking state to reset, and removes and reports to the police.

3, insulation measurement

Insulation measurement be by each current transformer of quick short circuit use after tap separately tramegger measure each current transformer over the ground the insulation resistance between (GIS grounded parts) insulation resistance and each current transformer realize, and, no matter select over the ground or select with respect to other current transformer, this " selection " is all that in the function control unit by this test control device for current transformer, each control knob carries out fast, the method of measuring over the ground or measuring with respect to other current transformers compared with manual each terminal head of short circuit current mutual inductor one by one selection, can save the plenty of time.

When current transformer is plugged into the plug TB2 of plug-in unit while inserting in the 3rd connector RE3 of megger test unit, plug into 1,2 pin of plug TB2 of plug-in unit of current transformer make the 3rd connector RE3 functional switch closure, the 18 the 14 relay K 14 of controlling in branch road of function control unit is moved, first, second and third interlock function of controlling between the first relay K 1 in branch road, the second relay K 2, the 3rd relay K 3 is lost thereupon, and function control unit is in insulation measurement state.

The plug into effect of 13,12 pin of plug TB2 of plug-in unit of current transformer is to guide plug into 3～11 pin (being current transformer) of plug TB2 of plug-in unit of current transformer being connected in the plug into tramegger measuring-signal of the J terminal on the web joint TB1 of plug-in unit of current transformer into by the 3rd connector RE3 of megger test unit.

In Fig. 2,3,4, the 5 script bodies of the 3rd connector RE3 of megger test unit are shorted together, and 6,7,8 pin are shorted together, and 9,10,11 pin are shorted together.That is to say, when function control unit is during in insulation measurement state, A, B, C threephase current transformer separately 1S1,1S2, the 1S3 of NO.1 current transformer are plugged into terminal by short circuit.

Carry out A, B, the measurement of the whole No.1 current transformer of C three-phase insulation against ground resistance, closure first simultaneously, two, three control knob SB1, SB2, SB3, so first, two, three relay K 1, K2, K3 moves, A, B, whole 1S1 of the No.1 current transformer of C three-phase, 1S2, the 1S3 terminal of plugging into has all been connected to the plug into J terminal of web joint TB1 of plug-in unit of current transformer by the plug into plug TB2 of plug-in unit and the 3rd connector RE3 of megger test unit of current transformer, the measuring-signal of tramegger on J terminal is added in to the plug into terminal of plugging into of the each current transformer on the web joint TB1 of plug-in unit of current transformer, the plug into J of web joint TB1 of plug-in unit of current transformer, between E terminal, form the test loop of the insulation against ground resistance of measuring whole No.1 current transformers.

Sometimes except examining current transformer insulating property over the ground, also need to examine current transformer insulating property each other, this can carry out equally speed and conveniencely.

For example, what on current transformer is plugged into 3～11 binding posts of web joint TB1 of plug-in unit, connect is not A, B, C threephase current transformer, but same three current transformers (No.1, No.2, No.3) that are stacked together on mutually need to be examined these three current transformers insulation situation being each other stacked together:

Select only closed the first control knob SB1, the first relay K 1 is moved, only No.1 current transformer has been connected to the plug into J terminal of web joint TB1 of plug-in unit of current transformer by the plug into plug TB2 of plug-in unit and the 3rd connector RE3 of megger test unit of current transformer, and No.2 and No.3 current transformer are still in ground state.Now measure insulation resistance by J terminal, not only No.1 current transformer insulation situation has over the ground obtained examination, and No.1 current transformer has also obtained examination with respect to the insulation situation of No.2 and No.3 current transformer.

Situation while selecting only closed the second control knob SB2 or the 3rd control knob SB3 is similar with the situation of closed the first control knob SB1 only.

4, utilize this control desk to confirm fast current transformer closed-loop path, check current transformer hree-phase symmetry fast

In GIS manufacture and installation process, must avoid the closed-loop path relevant to current transformer to occur.Use this device measuring in excitation property, utilize the inductive method can easily to whether existing closed-loop path to confirm.

Current transformer in GIS is conventionally all many and stacks installation, as shown in Figure 3.Suppose to have a conductor 1 through NO.1, the NO.2, the NO.3 current transformer that stack installation, form closed-loop path, as shown in Figure 5, in the time that wherein a current transformer (as No.1 BCT) carries out excitation, on other current transformer, will there is induced voltage to produce (under open circuit situation) or induction current and flow through (under short-circuit conditions), just can judge whether to exist closed-loop path according to having or not of this phenomenon.

In above-mentioned example, in the time using this control desk to No.1 current transformer excitation, the 2S1 of No.2 current transformer and 2S2 are connected to plug into 1,2 places of web joint TB1 of plug-in unit of current transformer, voltage Table V 3 on finder, if the significant change along with the raising of No.1 current transformer field voltage of voltage table V3 indicating value, just can define closed-loop path and exist.

Because this device can connect many current transformers simultaneously, and target current mutual inductor can switch fast, so the symmetry of current transformer performance can be differentiated fast between out-phase.

For example, switch threephase current transformer excitation fast by this device, find that A, B, C threephase current transformer corresponding exciting current on 372V electrical voltage point is respectively 14mA, 13mA, 32mA, so will be to the symmetry statement into question of this threephase current transformer performance.

In addition, under prerequisite at the equipment of guarantee output capacity up to 10kVA, pass through preferred element, controlling dimension, this device is tested current transformer some major equipments (pressure regulator T1, transformer, mutual inductor etc.) that use and has been concentrated on together, form compact, portable integration test equipment, with conventional decentralized current transformer testing apparatus by comparison, be adapted to especially need in GIS manufacture process the occasion of fluidity testing current transformer.

In test process, when in loop, the situation of excess current occurs or while pressing in function control unit corresponding control knob, alarm, pilot lamp in corresponding warning on warning and indicating member or instruction branch road are reported to the police or indicate, for pointing out current state.

Above test control device for current transformer provided by the present invention is illustrated, the elaboration that embodiments of the present invention are carried out, just for helping to understand technical scheme of the present invention and principle of work, meanwhile, for one of ordinary skill in the art, according to principle of work of the present invention, all will change in specific embodiments and applications, for example, increasing under the prerequisite of certain cost, also can realize this device characteristic and institute's function of dominant etc. by using PLC.In sum, above-mentioned explanation should not be construed as limitation of the present invention.

Claims

1. a test control device for current transformer, it is characterized in that: comprise power supply unit, pressure regulation unit, voltage transformation unit, function control unit, volt-ampere characteristic test cell, power frequency proof voltage test cell, megger test unit, the current transformer plug-in unit of plugging into, power supply unit output terminal connects pressure regulation unit, the confession electrical input of function control unit, the output terminal of pressure regulation unit connects the input end of voltage transformation unit, the output terminal of voltage transformation unit connects volt-ampere characteristic test cell, the confession electrical input of power frequency proof voltage test cell, the electrical input that supplies of megger test unit is used for connecting tramegger, the volt-ampere characteristic test control end of function control unit, power frequency proof voltage test control end, megger test control end connect respectively the control signal input end of volt-ampere characteristic test cell, power frequency proof voltage test cell, megger test unit, the current transformer plug-in unit of plugging into comprises plug into connecting terminals fishplate bar and the plug for the each joint of current transformer to be measured of plugging into more, the corresponding connection of respective terminal of web joint and plug, plug is used for being plugged on volt-ampere characteristic test cell or power frequency proof voltage test cell or megger test unit,

What described function control unit comprised the first to the 17 relay, timing relay and the first to the 14 control knob, the 16 control knob, timing relay often drives control knob, zero-location control switch, volt-ampere characteristic test function switch, power frequency proof voltage test function switch, megger test functional switch;

2. test control device for current transformer as claimed in claim 1, is characterized in that: described pressure regulation unit comprises pressure regulator, and the input end of pressure regulator connects power supply unit output terminal, and the output terminal of pressure regulator connects the input end of voltage transformation unit.

3. test control device for current transformer as claimed in claim 2, is characterized in that: described voltage transformation unit comprises the first transformer, the second transformer;

4. test control device for current transformer as claimed in claim 3, is characterized in that: described volt-ampere characteristic test cell comprises the first connector, and the plug into plug of plug-in unit of the first connector and current transformer is corresponding, the first connector comprises the first to ten joint among three members, first of the first connector, corresponding two links that connect volt-ampere characteristic test cell functional switch of the second connector, the joint among three members of the first connector connects the first end of the 4th relay the second normal opened contact, the 4th connector of the first connector connects the first end of the 5th relay the second normal opened contact, the 6th connector of the first connector connects the first end of the 6th relay the second normal opened contact, the 7th connector of the first connector connects the first end of the 7th relay the second normal opened contact, the 9th connector of the first connector connects the first end of the 8th relay the second normal opened contact, the tenth connector of the first connector connects the first end of the 9th relay the second normal opened contact, the 4th, the 5th, the 6th, the 7th, the 8th, the second end of the 9th relay the second normal opened contact is for connecting the 12 connector of the first connector, the first connector the 5th, the 8th, the 11 connector ground connection, the plug into plug of plug-in unit of current transformer comprises and the first to ten joint among three members first to ten joint among three members one to one of the first connector, plug into first, second connector phase short circuit of plug of plug-in unit of current transformer, current transformer plug into plug-in unit plug the 12, the tenth joint among three members phase short circuit.

5. test control device for current transformer as claimed in claim 4, is characterized in that: described power frequency proof voltage test cell comprises the second connector, and the plug into plug of plug-in unit of the second connector and current transformer is corresponding; The second connector comprises the first to ten joint among three members, corresponding two links that connect power frequency proof voltage test cell functional switch of first, second connector of the second connector, the 3rd to the 12 connector phase short circuit of the second connector; The plug into plug of plug-in unit of current transformer comprises and the first to ten joint among three members first to ten joint among three members one to one of the second connector, plug into first, second connector phase short circuit of plug of plug-in unit of current transformer, current transformer plug into plug-in unit plug the 12, the tenth joint among three members phase short circuit.

6. test control device for current transformer as claimed in claim 5, is characterized in that: described megger test unit comprises the 3rd connector, and the plug into plug of plug-in unit of the 3rd connector and current transformer is corresponding, the 3rd connector comprises the first to ten joint among three members, first of the 3rd connector, corresponding two links that connect megger test Elementary Function switch of the second connector, the joint among three members of the 3rd connector connects the first end of the first relay the 4th normally closed contact, the 6th connector of the 3rd connector connects the first end of the second relay the 4th normally closed contact, the 9th connector of the 3rd connector connects the first end of the 3rd relay the 4th normally closed contact, the second end of the 4th normally closed contact of the first relay, the second end of the 4th normally closed contact of the second relay, the equal ground connection of the second end of the 4th normally closed contact of the 3rd relay, the 5th normal opened contact first end of the first relay, the second relay the 5th normal opened contact first end, the 3rd relay the 5th normal opened contact first end is all connected in the 12 connector of the 3rd connector, the 5th normal opened contact the second end of the first relay connects respectively the 3rd of the 3rd connector, the 4th, the 5th connector, the 5th normal opened contact the second end of the second relay connects respectively the 6th of the 3rd connector, the 7th, the 8th connector, the 5th normal opened contact the second end of the 3rd relay connects respectively the 9th of the 3rd connector, the tenth, the 11 connector, the tenth joint among three members of the 3rd connector is used for connecting tramegger, the plug into plug of plug-in unit of current transformer comprises and the first to ten joint among three members first to ten joint among three members one to one of the 3rd connector, plug into first, second connector phase short circuit of plug of plug-in unit of current transformer, current transformer plug into plug-in unit plug the 12, the tenth joint among three members phase short circuit.

7. test control device for current transformer as claimed in claim 6, is characterized in that: described test control device for current transformer also comprises over-current protecting unit, and over-current protecting unit comprises overcurrent protection relay and current surveillance table; The coil of overcurrent protection relay and current surveillance table and current measurement control bridge are in series, and the first normal opened contact of overcurrent protection relay is connected in parallel on the first normal opened contact two ends of the 16 relay in the control of the 16 in function control unit branch road.

8. the test control device for current transformer as described in claim 1 to 7 any one, is characterized in that: this test control device for current transformer also comprises reports to the police and indicating member, and warning and indicating member comprise:

The first instruction branch road, comprises power light;

The second instruction branch road, in series by stroboscopic lamp and the 15 control knob;