CN104617563A - Special relay protection device for ring main unit - Google Patents
Special relay protection device for ring main unit Download PDFInfo
- Publication number
- CN104617563A CN104617563A CN201510022283.4A CN201510022283A CN104617563A CN 104617563 A CN104617563 A CN 104617563A CN 201510022283 A CN201510022283 A CN 201510022283A CN 104617563 A CN104617563 A CN 104617563A
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- module
- main unit
- ring main
- circuit
- relaying device
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Abstract
The invention discloses a special relay protection device for a ring main unit. The device is characterized by comprising a totally-sealed metal box body, a wide-range acquiring control circuit and an outgoing line terminal; the wide-range acquiring control circuit and the outgoing line terminal are arranged in the totally-sealed metal box body; the totally-sealed metal box body is equipped with an integrally-formed box body, comprising a panel fixed at the front end of the box body, and a rear plate fixed at the rear end of the box body; a front sealing cushion and a rear sealing cushion are respectively arranged between the panel, the box body and the rear plate; the outgoing line terminal is arranged on the rear plate through a waterproof mounting structure. According to the device, the optimal structural design is adopted, the protection grade reaches IP65, the boundary dimension is small, and the mounting is flexible; the extremely wide range acquiring circuit is designed to ensure that the current ranging from 0.02 to 100A can meet the acquiring precision, and moreover, the quick protection function is also achieved.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System, especially relate to a kind of protective relaying device be exclusively used in urban power distribution network ring main unit.
Background technology
In urban power distribution network, medium voltage network adopts ring network power supply pattern in a large number, and ring main unit is switchgear wherein.The electric energy that transformer station sends is fed to each user terminal by ring main unit and power circuit, needs to disconnect corresponding ring main unit outlet switch in time when breaking down in user side, and excision fault ensures main network system not by fault effects.
Protective relaying device obtains the operation conditions of electrical network by gathering electric current, voltage and state information, judge whether electrical network breaks down, and then outputs signal control switch disconnect the safety protecting electrical network if any fault.On the control cubicle that conventional protective relaying device is installed on special control room usually or on middle-placed switch cabinet, because the temperature of running environment environment, humidity are in controllable state, so less demanding to the degree of protection of protective relaying device; In addition due to the control cubicle in special control room or the space of middle-placed switch cabinet larger, therefore substantially unrestricted to the installation site of protective relaying device, size; And line load is run relatively stable, require lower to the current range that protective relaying device gathers, General Requirements 0.2A ~ 100A.
And ring main unit is generally placed in open air, internal temperature range of operation is at-40 DEG C ~ 85 DEG C, and interior humidity range of operation is 0% ~ 100%; In addition, ring main unit structure closely, causes position, the size that can install for protective relaying device very limited; And alter a great deal due to the power consumption of urban distribution network electricity consumption user, therefore require that the collection current range of protective relaying device is higher, usually require 0.02 A ~ 100A; Moreover the position of installing due to relaying protection is in the end of distribution network, The faster the better therefore to require the action response speed of relaying protection, spreads to major network cause expansion accident scope to avoid the fault of user side.
Summary of the invention
For the problems referred to above, the invention provides a kind of degree of protection and reach IP65; Overall dimension is small and exquisite, and mounting means is flexible; Current acquisition scope is large, precision is high and have the special protective relaying device of ring main unit of quick defencive function.
The technical scheme that the present invention adopts for its technical problem of solution is:
The special protective relaying device of ring main unit; it is characterized in that: comprise hermetically sealed metal cabinet, be arranged on wide region acquisition control circuit in hermetically sealed metal cabinet and lead-out wire terminal; described hermetically sealed metal cabinet comprises integrate shaped type case body; be fixed on the panel of case body front end and be fixed on the postnotum of case body rear end; be respectively arranged with front sealing gasket, rear sealing gasket between described case body and panel, postnotum, described lead-out wire terminal is arranged on postnotum by a waterproof assembling structure.
As the further improvement of such scheme, described waterproof assembling structure comprises the hole be opened on postnotum, be arranged on around lead-out wire terminal and with hole and coordinate the boss installed and the sealing gasket be set on boss, and described sealing gasket is pressed between lead-out wire terminal boss and postnotum.
As the further improvement of such scheme, the upper and lower surface of described case body is respectively arranged with installing blind, and described postnotum also offers installing blind.
Wherein, described wide region acquisition control circuit comprises power module, CPU module and the power-frequency voltage acquisition module be connected with CPU module respectively, power current acquisition module, switching value acquisition module, tripping operation pulse output module, human-computer interface module, communication module.
Further, it is the microprocessor of 32 and the clock circuit of periphery that described CPU module comprises bus, and described microprocessor comprises memory, A/D modular converter, serial communication interface, real-time clock and power management module.
Further, the voltage follower circuit that described power-frequency voltage acquisition module comprises voltage transformer and is made up of A1 operational amplifier, external voltage signal is connected to voltage transformer, the input of the voltage follower circuit of access A1 operational amplifier composition after isolation, the A/D converter of the output access CPU module of voltage follower circuit completes voltage signal acquisition.
Further, the two-way synchronizing amplifier circuit that described power current acquisition module comprises current transformer and is made up of A2, A3 operational amplifier, foreign current signal is connected to current transformer, be linked into the two-way synchronizing amplifier circuit of A2, A3 operational amplifier composition after isolation, two-way synchronizing amplifier exports two inputs being connected respectively to the A/D converter of CPU module.
Further, the amplifier circuit multiplication factor that described A2 operational amplifier is formed is 10 times of the amplifier circuit multiplication factor that A3 operational amplifier is formed.
Further, described tripping operation pulse output module comprises triode, tripping relay, current-limiting resistance, pulse storage capacitor C and charging circuit, the base stage of described triode is connected with CPU module, the grounded emitter of triode, the collector electrode of triode is connected with tripping relay coil, faulty line is connected to after the normally opened contact of tripping relay coil is connected with pulse storage capacitor C, the normally opened contact of described tripping relay coil is connected with charging circuit by current-limiting resistance with the junction of pulse storage capacitor C, charging circuit is also connected with power module respectively with pulse storage capacitor C.
As the further improvement of such scheme, described microprocessor have employed difference half-wave Fourier algorithms and calculates fault current.
The invention has the beneficial effects as follows: the special protective relaying device of ring main unit of the present invention, by the structural design optimized, makes device degree of protection reach IP65; Overall dimension is small and exquisite, and mounting means is flexible; Adopt pole wide region Acquisition Circuit design, ensure that electric current all can meet acquisition precision and have quick defencive function under 0.02A ~ 100A scope.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described.Obviously, described accompanying drawing is a part of embodiment of the present invention, instead of whole embodiments, those skilled in the art under the prerequisite not paying creative work, other designs that can also obtain according to these accompanying drawings and accompanying drawing:
Fig. 1 is embodiment of the present invention STRUCTURE DECOMPOSITION figure;
Fig. 2 is embodiment of the present invention circuit theory diagrams.
Embodiment
With reference to Fig. 1 ~ Fig. 2, the special protective relaying device of ring main unit, comprise hermetically sealed metal cabinet, be arranged on the wide region acquisition control circuit in hermetically sealed metal cabinet and lead-out wire terminal, described hermetically sealed metal cabinet comprises integrate shaped type case body 12, be fixed on the panel 11 of case body 12 front end by front hold-down screw 16 and be fixed on the postnotum 13 of case body 12 rear end by rear hold-down screw 17, described case body 12 and panel 11, front sealing gasket 14 is respectively arranged with between postnotum 13, rear sealing gasket 15, described lead-out wire terminal is arranged on postnotum 13 by a waterproof assembling structure, in order to ensure that this perforate has sealed waterproof effect, this waterproof assembling structure comprises the hole be opened on postnotum 13, be arranged on around lead-out wire terminal and with hole and coordinate the boss installed and the sealing gasket be set on boss, described sealing gasket is pressed between lead-out wire terminal boss and postnotum 13, fills out the space be filled with around leading-out terminal.So a kind of integral seal structure, ensure that protective device degree of protection reaches IP65 rank.
Further, the upper and lower surface of described case body 12 is respectively arranged with installing blind 18, and described postnotum 13 also offers installing blind, and installing blind is embedded in described tank surface, and hole inside fire attack has internal thread; Adopt three such installing blind structures, ensure the sealing property of casing on the one hand, also make protective device have three direction crystallized abilities on the other hand, ensure to install unrestricted at narrow space.
With further reference to Fig. 2, described wide region acquisition control circuit comprises power module 28, CPU module 21 and the power-frequency voltage acquisition module 22 be connected with CPU module 21 respectively, power current acquisition module 23, switching value acquisition module 24, the pulse output module 25 that trips, human-computer interface module 26, communication module 27.
Wherein, it is the microprocessor of 32 and the clock circuit of periphery that described CPU module 21 comprises bus, and described microprocessor comprises memory, A/D modular converter, serial communication interface, real-time clock and power management module; This makes circuit structure be simplified greatly, reduces circuit board size.
Further, the voltage follower circuit that described power-frequency voltage acquisition module 22 comprises voltage transformer and is made up of A1 operational amplifier, external voltage signal is connected to voltage transformer, the input of the voltage follower circuit of access A1 operational amplifier composition after isolation, the A/D converter of the output access CPU module of voltage follower circuit completes voltage signal acquisition.
Further, the two-way synchronizing amplifier circuit that described power current acquisition module 23 comprises current transformer and is made up of A2, A3 operational amplifier, foreign current signal is connected to current transformer, be linked into the two-way synchronizing amplifier circuit of A2, A3 operational amplifier composition after isolation, two-way synchronizing amplifier exports two inputs being connected respectively to the A/D converter of CPU module; Wherein, the amplifier circuit multiplication factor that A2 operational amplifier is formed is 10 times of the amplifier circuit multiplication factor that A3 operational amplifier is formed, the A/D converter of CPU module gathers the output signal of this two-way amplifier simultaneously, and the current signal result of calculation obtained like this improves 10 times than common single channel Acquisition Circuit precision after integrated treatment.Therefore, under equal accuracy requires, the scope of current acquisition is corresponding have also been enlarged 10 times, meets the requirement of ring main unit to protective relaying device current acquisition wide region.
Further, described switching value acquisition module 24 comprises photoelectric isolated chip, the status signal of access outside line, and this signal is connected to the input of photoelectric isolated chip, and the output of photoelectric isolated chip is directly connected to the I/O pin of CPU module; The status signal of switching value acquisition module collection typically refers to deciliter state of line switching or the state of artificial deciliter console switch, and these signals participate in the logic discrimination of protective device as input variable.
Further, described tripping operation pulse output module 25 comprises triode, tripping relay, current-limiting resistance, pulse storage capacitor C and charging circuit, the base stage of described triode is connected with CPU module, the grounded emitter of triode, the collector electrode of triode is connected with tripping relay coil, faulty line is connected to after the normally opened contact of tripping relay coil is connected with pulse storage capacitor C, the normally opened contact of described tripping relay coil is connected with charging circuit by current-limiting resistance with the junction of pulse storage capacitor C, charging circuit is also connected with power module 28 respectively with pulse storage capacitor C, the input of tripping operation pulse output module is connected to the I/O pin of CPU module, receives the trip signal of controller, output is directly connected to the breaking coil of line switching.When circuit normally runs, the charging circuit of module is charged to pulse storage capacitor C by current-limiting resistance, when CPU module passes through monitoring voltage, electric current, the signal analysis of switch input variable to line failure, the tripping operation pulse signal of 30ms is sent by the I/O pin being connected to tripping operation pulse output module input, this pulse signal controls tripping relay R adhesive by triode, make the pulse storage capacitor C be connected on relay R contact release high energy tripping operation pulse to outside breaking coil, control circuit switch trip completes line fault excision process.
Human-computer interface module 26 is connected with CPU module 21 by many I/O lines, comprises display panels, five key boards and signal lamp; The information such as voltage, electric current, state, set point, event of display panels circuit; five key boards receive the operational order of operating personnel; signal lamp indicates the operation information of protective device in more eye-catching mode, generally includes power supply status, protective device tripped condition etc.
Communication module 27 is connected with CPU module by transmitting-receiving two I/O lines, and signal is connected with other intelligent terminal after isolation, realizes the remote measurement and control function of protective device.
Power module 28 adopts isolating switch power, comprises two groups of isolation and amplifier, and one group of low-voltage output is supplied to above-mentioned each module as working power; Another group high voltage exports the charging circuit being connected to tripping operation pulse output module, gives tripping operation pulse storage capacitor C charging.
The quick protection of described microprocessor have employed difference half-wave Fourier algorithms and calculates fault current method; the data window width needed due to this algorithm equals every cycle sampling number/2 of central processing unit and adds 1; therefore central processing unit only needs to wait for that the half left and right time of power frequency period can detect line fault, about this at least needs the acquisition time of a power frequency period to shorten half than conventional full wave Fourier algorithm in theory.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (10)
1. the special protective relaying device of ring main unit, it is characterized in that: comprise hermetically sealed metal cabinet, be arranged on the wide region acquisition control circuit in hermetically sealed metal cabinet and lead-out wire terminal, described hermetically sealed metal cabinet comprises integrate shaped type case body (12), be fixed on the panel (11) of case body (12) front end and be fixed on the postnotum (13) of case body (12) rear end, described case body (12) and panel (11), front sealing gasket (14) is respectively arranged with between postnotum (13), rear sealing gasket (15), described lead-out wire terminal is arranged on postnotum (13) by a waterproof assembling structure.
2. the special protective relaying device of ring main unit according to claim 1; it is characterized in that: described waterproof assembling structure comprises the hole be opened on postnotum (13), be arranged on around lead-out wire terminal and with hole and coordinate the boss installed and the sealing gasket be set on boss, described sealing gasket is pressed between lead-out wire terminal boss and postnotum (13).
3. the special protective relaying device of ring main unit according to claim 1, is characterized in that: the upper and lower surface of described case body (12) is respectively arranged with installing blind (18), and (13) also offer installing blind with described postnotum.
4., according to the arbitrary described special protective relaying device of ring main unit of claims 1 to 3, it is characterized in that: described wide region acquisition control circuit comprises power module (28), CPU module (21) and the power-frequency voltage acquisition module (22) be connected with CPU module (21) respectively, power current acquisition module (23), switching value acquisition module (24), the pulse output module (25) that trips, human-computer interface module (26), communication module (27).
5. the special protective relaying device of ring main unit according to claim 4; it is characterized in that: it is the microprocessor of 32 and the clock circuit of periphery that described CPU module (21) comprises bus, and described microprocessor comprises memory, A/D modular converter, serial communication interface, real-time clock and power management module.
6. the special protective relaying device of ring main unit according to claim 5; it is characterized in that: the voltage follower circuit that described power-frequency voltage acquisition module (22) comprises voltage transformer and is made up of A1 operational amplifier; external voltage signal is connected to voltage transformer; the input of the voltage follower circuit of access A1 operational amplifier composition after isolation, the A/D converter of the output access CPU module of voltage follower circuit completes voltage signal acquisition.
7. the special protective relaying device of ring main unit according to claim 5; it is characterized in that: the two-way synchronizing amplifier circuit that described power current acquisition module (23) comprises current transformer and is made up of A2, A3 operational amplifier; foreign current signal is connected to current transformer; be linked into the two-way synchronizing amplifier circuit of A2, A3 operational amplifier composition after isolation, two-way synchronizing amplifier exports two inputs being connected respectively to the A/D converter of CPU module.
8. the special protective relaying device of ring main unit according to claim 7, is characterized in that: the amplifier circuit multiplication factor that described A2 operational amplifier is formed is 10 times of the amplifier circuit multiplication factor that A3 operational amplifier is formed.
9. the special protective relaying device of ring main unit according to claim 5, it is characterized in that: described tripping operation pulse output module (25) comprises triode, tripping relay, current-limiting resistance, pulse storage capacitor C and charging circuit, the base stage of described triode is connected with CPU module, the grounded emitter of triode, the collector electrode of triode is connected with tripping relay coil, faulty line is connected to after the normally opened contact of tripping relay coil is connected with pulse storage capacitor C, the normally opened contact of described tripping relay coil is connected with charging circuit by current-limiting resistance with the junction of pulse storage capacitor C, charging circuit is also connected with power module (28) respectively with pulse storage capacitor C.
10. the special protective relaying device of ring main unit according to claim 5, is characterized in that: described microprocessor have employed difference half-wave Fourier algorithms and calculates fault current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510022283.4A CN104617563B (en) | 2015-01-16 | 2015-01-16 | The special protective relaying device of ring main unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510022283.4A CN104617563B (en) | 2015-01-16 | 2015-01-16 | The special protective relaying device of ring main unit |
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| Publication Number | Publication Date |
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| CN104617563A true CN104617563A (en) | 2015-05-13 |
| CN104617563B CN104617563B (en) | 2018-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510022283.4A Active CN104617563B (en) | 2015-01-16 | 2015-01-16 | The special protective relaying device of ring main unit |
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| CN (1) | CN104617563B (en) |
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| CN111063531A (en) * | 2020-01-07 | 2020-04-24 | 南方电网科学研究院有限责任公司 | Voltage transformer |
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| Publication number | Publication date |
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| CN104617563B (en) | 2018-02-13 |
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