CN202939876U - High precision resistor generator of relay protection automation simulation system - Google Patents
High precision resistor generator of relay protection automation simulation system Download PDFInfo
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- CN202939876U CN202939876U CN 201220557563 CN201220557563U CN202939876U CN 202939876 U CN202939876 U CN 202939876U CN 201220557563 CN201220557563 CN 201220557563 CN 201220557563 U CN201220557563 U CN 201220557563U CN 202939876 U CN202939876 U CN 202939876U
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Abstract
The utility model discloses a high precision resistor generator of a relay protection automation simulation system and is used for carrying out function detection on a generation-transformer set protection device instead of a motor rotor. The high precision resistor generator of relay protection automation simulation system comprises a resistor box which is connected with the generation-transformer set protection device through an output circuit of the resistor generator, a micro controller, an input module and a display module, wherein a circuit of the micro controller is connected with the resistor box, the micro controller outputs a resistor control signal to the resistor box and controls resistance outputted by the resistor box, a circuit of the input module is connected with the micro controller, the input module inputs resistor control instructions to the micro controller, the micro controller outputs a resistor control signal according to the resistor control instructions, a circuit of the display module is connected with the micro controller, and the display module displays a resistor value outputted by the resistor box which is controlled by the micro controller. The high precision resistor generator replaces a motor which is expensive, reduces practical training cost of the generation-transformer set protection device, employs combined design of relays and resistor networks, controls the relays through the micro controller for switching the resistor networks and realizes precise resistor output.
Description
Technical field
The utility model relates to a kind of resistance generation technique for the generator protection test, is specifically related to a kind of high-accuracy resistance generator for relay protection automation simulation system.
Background technology
As shown in Figure 1, be the circuit diagram of generator in prior art, it comprises energized circuit 1 ', rotor 2 ' and stator 3 ', and its rotor 2 ' passes through R
EAnd C
EGround connection.In generator excitation circuit, generator rotor insulation is weak link because it not only running temperature is high, and rotating speed is also high, the rotor winding is subjected to powerful centrifugal action, easily friction, easily cause insulation harm mutually.Simultaneously, cooling-air also may be brought into the rotor such as charcoal ash, dust, greasy dirt and steam and stockpile insulating resistance value is descended.When occuring, shorted-turn fault also often can follow earth fault to occur.
Generator due to all many-sided reasons such as internal rotor makes moist, heat eliminating medium leakage, insulation ag(e)ing and mechanical vibration, easily causes the reduction of rotor insulation against ground level and then causes the rotor ground fault fault in During Process of Long-term Operation.When rotor generation one-point grounding fault, although can not cause direct harm to generator itself, if 2 ground connection occur in succession again, with the safety of serious threat generator.
The generator amature one-point grounding fault is one of common failure mode; for the safety in production that guarantees power plant normally moves; must grasp the ultimate principle of rotor earth fault protection as the guarantor person that continues; be familiar with occuring phenomenon and the disposal route of rotor ground fault fault, avoid occuring 2 earth faults of rotor with all strength.
1, the harm of rotor one point earth:
The generator amature one-point grounding fault is one of common failure mode; when occuring, one-point grounding fault not yet forms electric loop between field copper and ground; the field voltage of rotor is very little with the impact that the rotor current that flows through rotor is subject to; so generator is not worked the mischief; can pass through transfer load this moment, reexamines fault after steadily shutting down.
2, the harm of 2 ground connection of rotor:
1) destroy the symmetry in power generator air gap magnetic field, make the air-gap field distorted, the air-gap flux out of trim causes the generator high vibration, makes motor damage, the idle reduction of exerting oneself.2 ground connection of turbodynamo energized circuit also can cause axle system and steam turbine magnetization, and consequence is serious.If transverse differential protection is housed, also can cause its malfunction, therefore, transverse differential protection to be added a short time-delay after the rotor one-point grounding protection action, prevent malfunction;
2) 2 ground connection cause the winding current of non-short circuit to increase, if flow through the short-circuit current large (usually take l 500 A as boundary) of rotor body, also can make rotor generation Slow Deformation in the time of thermal effect scaling loss rotor, cause bias, the aggravation vibration.In addition, also may damage other excitation units, cause the loss of excitation fault, jeopardize generator and security of system.For guaranteeing the safe operation of generator, when generator amature winding generation one point earth, should send signal, the operations staff processes at once; If the operation that 2 ground connection should stop generator immediately occurs.Therefore, generator installing rotor a bit is very important with 2 ground protections.
In prior art, usually adopt the transformer unit protective device generator to be carried out the work of fault detect and protection.As shown in Figure 2, rotor 2 ' is connected energized circuit 1 ' with stator 3 ' difference circuit, and energized circuit 1 ' circuit connects transformer unit protective device 4 ', by transformer unit protective device 4 ', generator is detected in real time and protects.
At present, because generator is expensive, cause in carrying out transformer unit protective device 4 ' protective debugging and training, lack the external connection device (being generator) that carries out transformer unit protective device 4 ' work simulation.So this project for protective relaying device in prior art in default of external connection device (price is also more expensive); can't carry out the debugging of generator amature one point earth and two places ground protection and training; design a kind of resistance generator of high precision; and add that suitable external circuits design replaces external connection device, reaches identical result of training.
The utility model content
The utility model provides the high-accuracy resistance generator of a kind of relay protection automation simulation system; adopt high-accuracy resistance generator to substitute the external connection device of transformer unit protective device; reduce the real training cost of transformer unit protective device operation; realize simultaneously accurate output resistance; and realize digital control and show, be convenient to protective debugging and the training of transformer unit protective device.
For achieving the above object, the utility model provides the high-accuracy resistance generator of a kind of relay protection automation simulation system, be characterized in, this resistance generator is used for the instead of electr ic motor rotor circuit and connects the transformer unit protective device, carries out the Function detection of transformer unit protective device;
This resistance generator comprises:
Resistance box, its output circuit by resistance generator connects external transformer unit protective device;
Microcontroller, its circuit contact resistance box, output resistance controls signal to resistance box, the resistance of controlling resistance box output;
Load module, its circuit connects microcontroller, and to microcontroller input resistance steering order, microcontroller is according to this resistance steering order output resistance control signal;
Display module, its circuit connects microcontroller, and the numerical value of the resistance of microprocessor controls resistance box output is shown.
Above-mentioned resistance box comprises:
Resistor network, the output of its circuit contact resistance box;
Relay, itself and resistor network are connected in parallel, and this relay switch resistor network realizes that resistance accurately exports;
Microprocessor control line, its circuit connect the output terminal of microcontroller and the input end that circuit connects relay, and microcontroller is by microprocessor control line transmission resistance control signal, pilot relay convert resistance network.
Above-mentioned resistor network comprises some resistance that are connected in series;
Above-mentioned resistance box comprises some relays, several relays respectively with the resistance of resistor network corresponding being connected in parallel one by one.
In above-mentioned resistor network, the value of each resistance adopts the binary coding network mode, and the value of this resistance is 2
n, n is more than or equal to 0.
The load module input needs the resistance steering order of high-accuracy resistance generator output to microcontroller; Microcontroller receives the resistance steering order, and output resistance controls signal to resistance box; The resistance box repeat circuit is according to resistance control signal controlling resistance network output resistance; Microcontroller is sent to display module with the numerical value of its controlling resistance box output resistance, and display module intuitively shows the resistance of high-accuracy resistance generator output.
In the high-accuracy resistance generator of the utility model relay protection automation simulation system and method for testing and prior art, the protective debugging of transformer unit protective device is compared with Training Methodology, its advantage is, the utility model adopts high-accuracy resistance generator to substitute the external connection device of transformer unit protective device, namely substitute expensive generator, reduced the real training cost of transformer unit protective device operation;
The utility model provides a kind of high-accuracy resistance generator, and the design that it adopts relay and resistor network to combine by microprocessor controls relay switch resistor network, realizes the accurate output of resistance;
High-accuracy resistance generator of the present utility model is provided with display module and load module, realizes digital control and shows, is convenient to protective debugging and the training of transformer unit protective device.
Description of drawings
Fig. 1 is the circuit module figure of generator in prior art;
Fig. 2 is the circuit diagram of transformer unit protective device and generator in prior art;
Fig. 3 is the circuit module figure of the high-accuracy resistance generator of the utility model relay protection automation simulation system;
Fig. 4 is the circuit module figure of resistance box in the high-accuracy resistance generator of the utility model relay protection automation simulation system;
Fig. 5 is the circuit theory diagrams of resistance box in the high-accuracy resistance generator of the utility model relay protection automation simulation system;
Fig. 6 is the circuit connection diagram of high-accuracy resistance generator in the rotor earth fault protection test of the utility model relay protection automation simulation system;
Fig. 7 is the circuit connection reduced graph of high-accuracy resistance generator in the rotor earth fault protection test of the utility model relay protection automation simulation system;
Fig. 8 is that in Fig. 7, the circuit of high-accuracy resistance generator in the rotor earth fault protection test connects refinement figure.
Embodiment
Below in conjunction with accompanying drawing, further illustrate specific embodiment of the utility model.
The utility model discloses the high-accuracy resistance generator of a kind of relay protection automation simulation system; be used for substituting expensive generator at the protective debugging that carries out the transformer unit protective device and training; as the external connection device of relay protection automation simulation system, realize Real-Time Monitoring and the defencive function of transformer unit protective device to generator detected and train.
As shown in Figure 3, the high-accuracy resistance generator of a kind of relay protection automation simulation system comprises resistance box 1, microcontroller 2, load module 3 and display module 4.
As shown in Figure 4, resistance box 1 comprises resistor network 13, relay 12, microprocessor control line 11.
The output of resistor network 13 circuit contact resistance boxes 1, and export the resistance that substitutes generator to the transformer unit protective device.
Microprocessor control line 11 circuit connect the output terminal of microcontroller 2, and the input end of circuit connection relay 12, and microcontroller 2 is by microprocessor control line 11 transmission resistance control signals, pilot relay 12 convert resistance networks 13.
Now the programmable resistance chip for the computer market is difficult to reach the utility model designing requirement on precision and resistance range, and it is very large to be subject to the influence factor of environment.To adopting the resistor network form in this utility model, realize the control output of resistance.
What in the utility model, resistance box 1 specific design adopted is that the mode that relay 12 and resistor network 13 designs combine is carried out, and comes pilot relay 12 to come convert resistance network 13 by microcontroller 2, realizes the accurate output of resistance.
In preferred the present embodiment, resistor network 13 comprises some resistance that are connected in series, and is provided with some relays 12 in resistance box 1 simultaneously, these several relays 12 respectively with the resistance of resistor network 13 corresponding being connected in parallel one by one.
In resistor network 13, the value of each resistance adopts the binary coding network mode to realize, the value of this resistance is 2
n, wherein n is more than or equal to 0.
Preferably, in the present embodiment, the resistance of the interior personal share resistance of resistor network 13 is along with its order of connection increases successively, be specially first resistance and be 1, the second resistor resistance is that 2, the 3rd resistances are 4, the resistance that connects successively afterwards is followed successively by 8,16,32,64,128,256,512,1024,2048,4096 ..., to 1024*1024.
As shown in Figure 5, the circuit theory that has specifically shown resistance box 1.The whole circuit of resistance box 1 is composed in series by coding resistor, passes through Do1 ... determine that to the control signal that Do20 obtains which resistance is effective status, the output resistance of final whole circuit can be found out by the J1 port.As take relay k1 as example, when obtaining high level state, relay is not worked, and the resistance of connecting is effective, if relay work of low level state with the resistive short of controlling, sees that in system this resistance is in the short circuit state.For example, want to obtain the resistance in 1028 Europe, encoding D o20 ... to Do1 be 00000000010000000100, wherein 1 is that the high level voltage that obtains is+5V, 0 is 0v, this moment k11, k3 jurisdiction resistance is effective status, other resistance are in the short circuit terminated state, are 1028 ohm so the output resistance of circuit is 1024+4.
Below take the transformer unit protective device, generator is carried out rotor earth fault protection test as example, the method for testing of the high-accuracy resistance generator for relay protection automation simulation system of the present utility model is described.
As shown in Figure 6; high-accuracy resistance generator 6 replaces generator to be arranged in the rotor earth fault protection test circuit; high-accuracy resistance generator 6 is connected with energized circuit 7 circuit; energized circuit 7 circuit connect the transformer unit protective device; connect the transformer unit protective device and can carry out as shown in Figure 6 simplified illustration; be divided into coupling unit 8 and measuring unit 9; coupling unit 8 and energized circuit 7 be connected resistance generator 6 circuit and be connected; measuring unit 9 circuit butt coupling unit 8; measuring unit 9 is gone back circuit and is connected voltage source 10, and this voltage source 10 provides power supply to whole system.Measuring unit 9 connects by coupling unit 8 and high-accuracy resistance generator 6, and high-accuracy resistance generator 6 is detected.When will carry out rotor earth fault protection when test, can high-accuracy resistance generator 6 take up an official post get a bit or 2 carry out ground connection, the rotor ground fault fault in the simulation generator course of work.
The present embodiment discloses a kind of rotor earth fault protection method of testing of the high-accuracy resistance generator for relay protection automation simulation system, and the test before carrying out the rotor earth fault protection test is prepared flow process and specifically comprised following steps:
Confirm before a, experiment that the energized circuit 7 of the rotor winding of generator all disconnects, and to its electrical verification.
B, test site are sealed, and with fence or rope, the testing ground are impaled, and hang nameplate.
C, due to after rotor earth fault protection puts into operation, can affect rotor loop loop over the ground and consist of or the insulation against ground resistance, therefore, when two cover rotor ground protection devices (dual configuration) is arranged, can only drop into a cover and move, another set of as cold standby.
So, dual configuration rotor ground protection device, a cover rotor ground protection device is used for operation, and another set of rotor ground protection device is as cold standby.
D, as shown in Figure 7; the test circuit of rotor earth fault protection carries out wiring; high-accuracy resistance generator 6, resistance R ' e, resistance R ' ' e, the first disconnecting link S1, the second disconnecting link S2 circuit connect into the loop; resistance R ' be connected with macro-axis Rot between e and R ' ' e, a terminal circuit of high-accuracy resistance generator 6 is connected to the transformer unit protective device that carries out integrated testability.
Connect complete after, the test circuit of rotor earth fault protection is carried out charged empty examination, check each experimental facilities and instrument and meter in the test circuit of rotor earth fault protection duty whether work.
As shown in Figure 8, be the refinement circuit theory diagrams of the test circuit of Fig. 7 rotor ground protection.Resistance R ' e, resistance R ' ' e, the first disconnecting link S1 and high-accuracy resistance generator 6 circuit connect into the loop.Because high-accuracy resistance generator 6 functions are accurate output resistance, equivalently represented with a slide rheostat in Fig. 8, its sliding contact circuit respectively connects starting switch SB and the second disconnecting link S2.Starting switch SB also circuit is connected with test-meter.The second disconnecting link S2 circuit connects current relay KA.
Carrying out rotor earth fault protection when test, in resistance R ' e, resistance R ' ' get first K1 of energized circuit and energized circuit second point K2 on e, come one point earth and 2 ground connection of simulated machine rotor.
The rotor earth fault protection method of testing that is used for the high-accuracy resistance generator of relay protection automation simulation system comprises following steps:
According to above-mentioned high-accuracy resistance generator 6, in this rotor earth fault protection method of testing, regulating resistance output specifically comprises following steps:
Step 1.1, load module 3 inputs need the resistance steering order of high-accuracy resistance generator 6 outputs to microcontroller 2.
Step 1.2, microcontroller 2 receive the resistance steering order, and output resistance controls signal to resistance box 1.
Step 1.3, resistance box 1 repeat circuit 12 are according to resistance control signal controlling resistance network 13 output resistances.
Step 1.4, microcontroller 2 are sent to display module 4 with the numerical value of its controlling resistance box 1 output resistance, and the resistance of 4 pairs of high-accuracy resistance generator 6 outputs of display module intuitively shows.
In the present embodiment, the rotor earth fault protection setting program is as follows:
Rotor one-point grounding protection deferred action is in signal or shutdown.2 ground protection snap actions are in shutdown.Actual definite value is generally adjusted different according to on-site experience value and different principle.
General unit stake resistance high-set setting can be adjusted and is 10kW, time-delay 5s;
The low definite value of stake resistance can be adjusted and is 1kW ~ 5kW, time-delay 5s;
For the unit of direct water-cooling, can adjust is 1kW ~ 5kW, time-delay 5s.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute will be all apparent.Therefore, protection domain of the present utility model should be limited to the appended claims.
Claims (4)
1. the high-accuracy resistance generator of a relay protection automation simulation system, is characterized in that, this resistance generator is used for the instead of electr ic motor rotor circuit and connects the transformer unit protective device, carries out the Function detection of transformer unit protective device;
This resistance generator comprises:
Resistance box (1), its output circuit by resistance generator connects external transformer unit protective device;
Microcontroller (2), its circuit connects described resistance box (1), and output resistance controls signal to resistance box (1), controls the resistance of described resistance box (1) output;
Load module (3), its circuit connects described microcontroller (2), and to microcontroller (2) input resistance steering order, microcontroller (2) is according to the described resistance control signal of this resistance steering order output;
Display module (4), its circuit connects described microcontroller (2), and the numerical value of the resistance of described microcontroller (2) controlling resistance box (1) output is shown.
2. the high-accuracy resistance generator of relay protection automation simulation as claimed in claim 1 system, is characterized in that, described resistance box (1) comprises:
Resistor network (13), the output of its circuit contact resistance box (1);
Relay (12), itself and described resistor network (13) are connected in parallel, and this relay (12) convert resistance network (13) realizes that resistance accurately exports;
Microprocessor control line (11), its circuit connects the output terminal of microcontroller (2) and the input end that circuit connects described relay (12), microcontroller (2) is by microprocessor control line (11) transmission resistance control signal, pilot relay (12) convert resistance network (13).
3. the high-accuracy resistance generator of relay protection automation simulation as claimed in claim 2 system, is characterized in that, described resistor network (13) comprises some resistance that are connected in series;
Described resistance box (1) comprises some relays (12), several relays (12) respectively with the resistance of resistor network (13) corresponding being connected in parallel one by one.
4. the high-accuracy resistance generator of relay protection automation simulation as claimed in claim 3 system, is characterized in that, in described resistor network (13), the value of each resistance adopts the binary coding network mode, and the value of this resistance is 2
n, n is more than or equal to 0.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220557563 CN202939876U (en) | 2012-10-29 | 2012-10-29 | High precision resistor generator of relay protection automation simulation system |
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|---|---|---|---|
| CN 201220557563 CN202939876U (en) | 2012-10-29 | 2012-10-29 | High precision resistor generator of relay protection automation simulation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103021236A (en) * | 2012-10-29 | 2013-04-03 | 上海市电力公司 | High-precision resistance generator of automatic relay-protection simulation system and testing method |
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2012
- 2012-10-29 CN CN 201220557563 patent/CN202939876U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103021236A (en) * | 2012-10-29 | 2013-04-03 | 上海市电力公司 | High-precision resistance generator of automatic relay-protection simulation system and testing method |
| CN103021236B (en) * | 2012-10-29 | 2015-04-15 | 上海市电力公司 | High-precision resistance generator of automatic relay-protection simulation system and testing method |
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Granted publication date: 20130515 |