CN203406595U - Safety detection device - Google Patents

Safety detection device Download PDF

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Publication number
CN203406595U
CN203406595U CN201320568634.8U CN201320568634U CN203406595U CN 203406595 U CN203406595 U CN 203406595U CN 201320568634 U CN201320568634 U CN 201320568634U CN 203406595 U CN203406595 U CN 203406595U
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China
Prior art keywords
circuit
safety detection
current
detection
temperature sensing
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Active
Application number
CN201320568634.8U
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Chinese (zh)
Inventor
田万春
黄文进
徐成江
陈美仕
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GUANGDONG GUANGDA ELECTRICAL Co Ltd
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GUANGDONG GUANGDA ELECTRICAL Co Ltd
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Abstract

The utility model relates to a low voltage reactive power compensator capacitor set switching safety detection device. The safety detection device comprises eight parts of a control panel, a system power source circuit, a temperature detection circuit, a current detection circuit, a communication terminal, a blower fan control circuit, a protection control circuit and a buzzer alarm, wherein each part is respectively in electrical connection with a main control chip. The safety detection device has a simple structure, realizes functional replacement of an intermediate relay, an ammeter and a temperature controller which are in in a low voltage reactive power compensator, is simple for wiring and reduces cost of a low voltage reactive power compensator.

Description

Safety detection device
Technical field
The utility model relates to a kind of safety detection device of low-voltage reactive compensator capable capacitor group switching.
Background technology
Along with the fast development of China's economy, improving constantly of quality of residents'life, increases day by day to the requirement of the quality of power supply, and the economical operation of electrical network is more and more subject to everybody attention.Energy-saving and cost-reducing, to improve the quality of power supply and electric power system stability and economy are the major issues that the efficient operation of electric power system faces, and are also current to one of main contents of quality of power supply research.
At present, solve electrical network electricity consumption power quality problem, generally adopt low-pressure reactive compensation hold concurrently harmonic elimination apparatus or filter, can improve power factor, absorb network system harmonic wave, reduce line loss, stable power-supplying voltage, efficiency and the reliability of raising power supply system.
At present; low-voltage reactive compensator capable demonstration is mainly indicator type current meter, ordinary temp transducer; easily the impact because of system voltage harmonic wave shows incorrect; lack overcurrent protection, overtemperature prote, open-phase protection and three-phase imbalance defencive function; often need manual inspection; or low-voltage reactive compensator capable occurs damaging components and parts, in the time of cannot normally moving, just finds.
Utility model content
The purpose of this utility model is to overcome the deficiency that above-mentioned prior art exists, and provides a kind of Real-Time Monitoring of can realizing, the safety detection device of the low-voltage reactive compensator capable capacitor group switching of defencive function, accident analysis demonstration and alarm integrated.
A kind of safety detection device; it is characterized in that: comprise control panel, system power supply circuit, temperature sensing circuit, current detection circuit, communication terminal, draught fan control circuit, protection control circuit and buzzer warning eight parts, each several part is electrically connected with main control chip respectively.
Safety detection device system power supply is through connecting low-voltage reactive compensator capable line voltage; the current-limiting circuit forming through inductive impedance; by isolating transformer (380V/9V) independently; through rectification circuit and voltage stabilizing circuit, output DC power supply, forms independently-powered; avoid owing to being subject to harmonic voltage impact; defencive function is malfunctioning, causes low-voltage reactive compensator capable components and parts to damage, and impact is normally produced.
Safety detection device is according to current transformer sample rate current signal; thermistor sample temperature signal, utilizes main control chip C8051f340 functional characteristic and mcu programming program, shows real-time current value, temperature value; when exceeding current value or the temperature value of setting; automatically excise capacitor branch road, time delay 180s restPoses automatically, when this protection reaches setting several; automatically lock this state buzzer warning; wait is fixed a breakdown, and re-powers reset, could normal switching action.
The purpose of this utility model can also adopt following technical measures to solve:
As a kind of scheme more specifically, described control panel is provided with display screen, alternator indicator, blower fan indicator light, run indicator, alarm lamp and button.
Described system power supply circuit consists of isolating transformer, rectification circuit and voltage stabilizing circuit, isolating transformer input is electrically connected to city, isolating transformer output is electrically connected by rectification circuit and voltage stabilizing circuit, and voltage stabilizing circuit provides required working power to temperature sensing circuit.System power supply adopts independently isolating transformer, through rectification circuit, voltage stabilizing circuit, exports suitable working power.
Described temperature sensing circuit comprises reactor temperature sensing circuit and in-cabinet temperature testing circuit, and reactor temperature sensing circuit is provided with reactor temperature probe and electric capacity, and in-cabinet temperature testing circuit is provided with temperature probe and electric capacity in cabinet.Temperature sensing circuit mainly adopts thermistor (temperature probe in reactor temperature probe and cabinet), and main control chip C8051f340 provides signal according to the characteristic of thermistor, through mcu programming process analysis, calculating, exports correct temperature value.
Described current detection circuit is provided with current transformer, current-limiting resistance and capacitor.Current detecting mainly adopts current transformer, and main control chip C8051f340, according to current transformer image data, through current-limiting resistance circuit picked up signal, through mcu programming process analysis, calculating, exports correct current value.Current detection circuit actual current value is greater than while setting current value, and overcurrent protection is excised capacitor branch road automatically, enters guard mode fault and shows; Time delay automatically terminates this state for 180 seconds.When current detection circuit wherein current value be 0 or three-phase electricity flow valuve when uneven, open-phase protection or three-phase imbalance protection, excise capacitor branch road automatically, enters guard mode fault and show; Time delay automatically terminates this state for 180 seconds.Protection is 10 times continuously, be automatically locked, and buzzer warning.
Described draught fan control circuit is provided with blower fan.Blower fan is automatically opened blower fan when temperature detection value reaches blower fan set point; when starting rear detected temperatures value lower than 50 ℃, blower fan automatically closes blower fan; when reaching 95 ℃, detected temperatures value automatically excises capacitor branch road; and carry out fault alarm demonstration; time delay restPoses for 180 seconds automatically; protection is 10 times continuously, be automatically locked, and buzzer warning.
Described safety detection device is also provided with signal lamp.
Described protection control circuit is provided with auxiliary relay.
The beneficial effects of the utility model are as follows:
(1) this kind of safety detection device can be realized Real-Time Monitoring electric current, temperature value;
(2) this kind of safety detection device has independent power supply, avoids being subject to harmonic voltage interference and defencive function malfunctioning;
(3) hardware circuit is combined on a plate and is realized simultaneously by control panel circuit, system power supply circuit, temperature sensing circuit, current detection circuit, communication terminal, draught fan control circuit, protection control circuit and buzzer warning eight segment sets;
(4) there is the function that electric current shows, temperature shows, accident analysis result shows and the number of stoppages shows;
(5) there is the functions such as overcurrent protection, open-phase protection, three-phase imbalance protection, overtemperature prote;
(6) excision and automatically recover switching automatically during fault;
(7), when faults frequent occurs, automatically lock and buzzer warning;
(8) the utility model can be applied to the safeguard measure of low-voltage reactive compensator capable capacitor group switching, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the utility model one example structure schematic diagram.
Fig. 2 is the utility model safety detection device winding diagram.
Fig. 3 is the utility model safety detection device circuit theory schematic diagram.
Fig. 4 is the utility model control panel schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
Referring to shown in Fig. 1 to Fig. 4; a kind of safety detection device 1 of low-voltage reactive compensator capable capacitor group switching; comprise control panel 29, system power supply circuit 14, temperature sensing circuit 6, current detection circuit 2, communication terminal 15, draught fan control circuit, protection control circuit 5 and buzzer warning eight parts, each several part is electrically connected with main control chip 28 respectively.Described low-voltage reactive compensator capable capacitor group switching 13 is provided with three input points, each input point is connected with three-phase line (A, B, C three-phase) by wire respectively, wire is provided with circuit breaker 8, lightning arrester 9, fuse 10 and reactor 12, wherein, at least reactor 12 and capacitor group switching 13 are arranged in an electric cabinet, see shown in Fig. 1 and Fig. 2.
Described control panel 29 is provided with display screen 30, alternator indicator 31, blower fan indicator light 32, run indicator 33, alarm lamp 34 and button.
Described system power supply circuit 14 consists of isolating transformer 23, rectification circuit 24 and voltage stabilizing circuit 25, isolating transformer 23 inputs are electrically connected to city, isolating transformer 23 outputs are electrically connected by rectification circuit 24 and voltage stabilizing circuit 25, and voltage stabilizing circuit 25 provides required working power to temperature sensing circuit 6.Shown in Fig. 2, safety detection device 1 is provided with system power supply circuit 14 input terminal U, V, and terminal U, V are connected with A, B phase line respectively, to obtain the input voltage of 380V.As shown in Figure 3, terminal U, V are connected with A, B respectively, by current limliting loop and isolating transformer 23, from 380V, become 9V, and through rectification circuit 24 and voltage stabilizing circuit 25, output DC supply 4.3V, reaches an independent power supply.
Described temperature sensing circuit 6 comprises reactor temperature sensing circuit 21 and in-cabinet temperature testing circuit 22, and reactor temperature sensing circuit 21 is provided with reactor temperature probe 18 and electric capacity, and in-cabinet temperature testing circuit 22 is provided with temperature probe 19 and electric capacity in cabinet.Reactor temperature probe 18 is for surveying the temperature of reactor 12, and in cabinet, temperature probe 19 is for surveying the temperature in electric cabinet.In conjunction with Fig. 2 and Fig. 3, the corresponding reactor temperature probe 18 of safety detection device 1 is provided with terminal k1, k2, and terminal k1, k2 are connected with cabinet internal reactance device temperature probe 18; In the corresponding cabinet of safety detection device 1, temperature probe 19 is provided with terminal k3, k4, and terminal k3, k4 are connected with temperature probe 19 in cabinet.Shown in Fig. 3, by reactor temperature probe 18(thermistor) and the interior temperature probe 19(thermistor of cabinet), functional characteristic (collection signal is voltage) due to mcu programming and main control chip C8051f340, therefore, at temperature detection loop contact resistance, detect resistance both end voltage, then through main control chip C8051f340 feedback information and the calculating of mcu programming program, be converted to temperature value output.(1) when the temperature value of setting when control panel fan operation is less than actual current value, fan starting, on the contrary stop; (2) when the temperature value of setting when control panel is less than actual current value, fan starting, safety detection device overtemperature prote, the alarm indication of control panel automatically excision capacitor group branch road, time delay 180s recovers switching function automatically.
Described current detection circuit 2 is provided with current transformer 7, current-limiting resistance 26 and capacitor 27.Shown in Fig. 2, each current transformer 7 on safety detection device 1 corresponding A, B, C three-phase wire is respectively equipped with Ia+, Ia-terminal, Ib+, Ib-terminal and Ic+, Ic terminal.Ia+, Ia-terminal are electrically connected with the current transformer on A phase electric wire, and Ib+, Ib--terminal are electrically connected with the current transformer on B phase electric wire, and Ic+, Ic-terminal are electrically connected with the current transformer on C phase electric wire.Shown in Fig. 3, by the sampled signal of A, B, C threephase current transformer, functional characteristic (collection signal is voltage) due to mcu programming and main control chip C8051f340, therefore, at current sampling circuit contact resistance, detect resistance both end voltage, then through main control chip C8051f340 feedback information and the calculating of mcu programming program, be converted to current value output.(1) when the current value of setting when control panel is less than actual current value, safety detection device overcurrent protection, the alarm indication of control panel automatically excision capacitor group branch road, time delay 180s recovers switching function automatically; (2) when current sampling circuit wherein one does not show current value mutually, safety detection device open-phase protection, the alarm indication of control panel automatically excision capacitor group branch road, time delay 180s recovers switching function automatically.
No matter overcurrent protection, open-phase protection or overtemperature prote, when protection number of times reaches 10 times, safety detection device positive lock, and buzzer warning; By investigation fault, and electrification reset could work.
Described draught fan control circuit is provided with blower fan 17, and shown in Fig. 2, safety detection device 1 is provided with terminal FJa, FJb and is connected with outside blower fan 17.
Described safety detection device 1 is also provided with signal lamp 16, and shown in Fig. 2, safety detection device 1 is provided with terminal A1, A2 and is connected with external signal lamp 16.
Described protection control circuit 5 is provided with auxiliary relay, and shown in Fig. 2, the corresponding protection control circuit 5 of safety detection device 1 is provided with terminal C+, the C-being connected with auxiliary relay coil, and auxiliary relay switch is arranged on the input lead of capacitor group switching 13.
Shown in Fig. 2, safety detection device 1 is provided with two communication terminals 15 that are connected with external communication mouth of com+ and com-.
In conjunction with Fig. 4, the button of control panel 29 and deixis are further described:
The display screen 30 of described control panel 29 adopts charactron to show, shows the numerical value of relevant parameter; Alternator indicator 31, when the aobvious state of wheel, while showing the electric current of certain phase, corresponding indicator light is bright; Blower fan indicator light 32, when manually opened blower fan or automatically open after blower fan, this indicator light is bright; Run indicator 33, when device operation, this indicator light is bright; Alarm lamp 34, when breaking down in guard mode or locking state, this indicator light is bright; Button comprises ESC button 35, after entering parameters state, presses this key and exits the state of setting; Long by entering software reset's state; At device locking state, press this key release.↑ button 36, during parameters, numeral adds 1, by numeral from 0 to 9 setting; → button 37, during parameters, moving one of cursor right; Long by entering simulated failure state; SET button 38, short in entering parameters state; Long by opening or close blower fan.

Claims (8)

1. a safety detection device; it is characterized in that: comprise control panel (29), system power supply circuit (14), temperature sensing circuit (6), current detection circuit (2), communication terminal (15), draught fan control circuit, protection control circuit (5) and buzzer warning eight parts, each several part is electrically connected with main control chip (28) respectively.
2. safety detection device according to claim 1, is characterized in that: described control panel (29) is provided with display screen (30), alternator indicator (31), blower fan indicator light (32), run indicator (33), alarm lamp (34) and button.
3. safety detection device according to claim 1, it is characterized in that: described system power supply circuit (14) consists of isolating transformer (23), rectification circuit (24) and voltage stabilizing circuit (25), isolating transformer (23) input is electrically connected to city, isolating transformer (23) output is electrically connected by rectification circuit (24) and voltage stabilizing circuit (25), and voltage stabilizing circuit (25) provides required working power to temperature sensing circuit (6).
4. safety detection device according to claim 1, it is characterized in that: described temperature sensing circuit (6) comprises reactor temperature sensing circuit (21) and in-cabinet temperature testing circuit (22), reactor temperature sensing circuit (21) is provided with reactor temperature probe (18) and electric capacity, and in-cabinet temperature testing circuit (22) is provided with temperature probe (19) and electric capacity in cabinet.
5. safety detection device according to claim 1, is characterized in that: described current detection circuit (2) is provided with current transformer (7), current-limiting resistance (26) and capacitor (27).
6. safety detection device according to claim 1, is characterized in that: described draught fan control circuit is provided with blower fan (17).
7. safety detection device according to claim 1, is characterized in that: described safety detection device is also provided with signal lamp (16).
8. safety detection device according to claim 1, is characterized in that: described protection control circuit (5) is provided with auxiliary relay.
CN201320568634.8U 2013-09-13 2013-09-13 Safety detection device Active CN203406595U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320568634.8U CN203406595U (en) 2013-09-13 2013-09-13 Safety detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320568634.8U CN203406595U (en) 2013-09-13 2013-09-13 Safety detection device

Publications (1)

Publication Number Publication Date
CN203406595U true CN203406595U (en) 2014-01-22

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Application Number Title Priority Date Filing Date
CN201320568634.8U Active CN203406595U (en) 2013-09-13 2013-09-13 Safety detection device

Country Status (1)

Country Link
CN (1) CN203406595U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111130081A (en) * 2020-04-01 2020-05-08 广东电网有限责任公司佛山供电局 System and method for reducing electric energy loss by additionally arranging current-limiting reactor bypass switch

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111130081A (en) * 2020-04-01 2020-05-08 广东电网有限责任公司佛山供电局 System and method for reducing electric energy loss by additionally arranging current-limiting reactor bypass switch
CN111130081B (en) * 2020-04-01 2020-07-14 广东电网有限责任公司佛山供电局 System and method for reducing electric energy loss by additionally arranging current-limiting reactor bypass switch

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