CN104597899A - Technical performance test platform of distribution automation device - Google Patents

Abstract

The invention relates to the field of electric equipment detection, in particular to a technical performance testing platform of a power distribution automation device using low-voltage equipment to simulate high-voltage power transmission and distribution equipment. Distribution automation device technical performance testing platform, including an experimental platform, a controller and a monitoring center, the experimental platform is connected to the controller, and the controller is connected to the monitoring center through an optical fiber; High-voltage substation power supply transformer and simulated neutral point equipment, simulated switchgear, simulated voltage transformer and simulated current transformer, simulated distribution transformer, simulated grounding control unit. The present invention composes an experiment platform, a controller, and a monitoring center into a complete test platform for the technical performance of the distribution automation device, and provides a test platform for the overall debugging and acceptance of the distribution automation device.

Description

Distribution automation device technical performance test platform

technical field

The invention relates to the field of electric equipment detection, in particular to a technical performance testing platform of a power distribution automation device using low-voltage equipment to simulate high-voltage power transmission and distribution equipment.

Background technique

Distribution automation technology is being popularized in the power system. A complete distribution network automation device includes an automation master station (hereinafter referred to as the monitoring center), a line segment switch, a terminal (or boundary) switch, a contact switch, an automation terminal (hereinafter referred to as a controller), power distribution communication, and information interaction. and network systems. These devices are scattered and installed in various sections of the distribution network feeder. The monitoring center is usually located far away from the site in the dispatching room. The entire automation process can only be completed through accurate cooperation with each other according to the prescribed procedures. Any obstacle in any link can lead to overall failure or even expansion of the accident. Comprehensive testing and acceptance of distribution network automation devices are indispensable links before they are put into operation.

The installation points of each equipment in the distribution network automation device are scattered, and generally can extend to tens of kilometers. The time allowed for in-place installation is relatively short, and only half a day or several hours of power failure is allowed. It is also not allowed to conduct short-circuit tests on live high-voltage lines to verify the technical performance of distribution network automation devices, such as phase-to-phase short-circuits in each section, single-phase grounding short-circuit, cutting, isolation, and power supply process. Abnormal phenomena such as refusal to operate and misoperation will inevitably occur during operation, and power failure search is often not allowed. It is very difficult to deal with defects, and sometimes a high price will be paid.

The acceptance method of the distribution network automation device stipulated in the enterprise standard Q/GDW567-2010 requires the simulation verification and black box test of the advanced functions of the distribution automation on the simulation simulation platform. This method can only inspect the part of the distribution network automation device. performance, cannot replace the overall linkage test on site, and cannot verify the overall technical indicators of the distribution network automation device.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a technical performance testing platform for distribution automation equipment, which provides a testing platform for the overall debugging and acceptance of distribution automation equipment.

To achieve the above object, the present invention provides the following technical solutions:

Distribution automation device technical performance testing platform, including an experimental platform, a controller and a monitoring center, the experimental platform is connected to the controller, and the controller is connected to the monitoring center through an optical fiber; High-voltage substation power supply transformer and simulated neutral point equipment, simulated switchgear, simulated voltage transformer and simulated current transformer, simulated distribution transformer, simulated grounding control unit.

In the technical performance test platform of the above distribution automation device, the simulated 10kV distribution line includes a 10kV three-phase circuit, and the 10kV three-phase circuit is divided into multiple section lines by the switchgear, and the line impedance is replaced by inductance or resistance; The size of the capacitive current in the section lines, and low-voltage capacitors are arranged on each section line.

In the technical performance test platform of the above distribution automation device, the simulated high-voltage substation power supply transformer includes a 0.4kV/0.1kV, Y/d-11 small power transformer, and a current filter; the simulated neutral point equipment includes an inductance coil for Simulate the slide wire resistance of the neutral point resistance, as well as the neutral point switch, knife switch, neutral point voltage transformer, neutral point current transformer; connect the current filter through the neutral point switch at the outlet of the power transformer, and the current filter The knife switch is connected with the inductance coil and the sliding wire resistance, the two ends of the inductance coil are connected with a neutral point voltage transformer, and the ends of the inductance coil and the sliding wire resistance are connected with a neutral point current transformer.

In the technical performance testing platform of the above-mentioned power distribution automation device, the analog switchgear includes a section switch, a terminal switch, and a tie switch. The section switch, the terminal switch, and the tie switch are used to connect the lines of each section. Switches and contact switches are 220V AC contactors.

In the technical performance testing platform of the above-mentioned power distribution automation device, the analog voltage transformer is a 100V/100V voltage transformer, and a first voltage transformer and a second voltage transformer are respectively equipped on both sides of each line switchgear. One voltage transformer is connected to the A and B phases of the line, and the second voltage transformer is connected to the B and C phases of the line for protection and measurement; the analog current transformer is a zero-sequence current transformer, and the subsection The installation points of switches, terminal switches and tie switches are all equipped with zero-sequence current transformers, and the secondary side of zero-sequence current transformers is connected to the controller.

In the above distribution automation device technical performance testing platform, the simulated distribution transformer is a D/y0 small-capacity three-phase transformer, and several D/y0 small-capacity three-phase transformers are arranged on the section line to verify the 10kV section line Protect the ability to identify inrush currents.

In the technical performance testing platform of the above distribution automation device, the simulated grounding control unit includes a grounding moment controller and a sliding wire resistance connected in series with it, the grounding timing controller controls the on-off moment of the zero-sequence voltage, and the sliding wire resistance Controls the magnitude of the output voltage.

Compared with the prior art, the beneficial effect of the present invention is that the present invention forms a complete set of technical performance testing platform of distribution automation device with the experimental platform, controller and monitoring center, and the experimental platform generates the analog quantity of the distribution network according to the test request Dynamic data, and send the analog dynamic data to the monitoring center through the communication link, thus forming a complete test environment, which solves the problem that the test environment of the distribution automation device in the prior art is incomplete and cannot obtain complete data. Through The operating status of the experimental platform can completely test the power distribution automation device, and improve the reliability and safety of the power distribution automation device. The experimental platform is composed of low-voltage components. The experimental platform with safe operation and complete functions is used to simulate various faults on high-voltage operating equipment, which solves the situation that the distribution automation equipment is scattered, the terrain is complex, and the linkage test and acceptance cannot be carried out on site. The present invention also solves the defect that the simulation platform in the prior art can only test the partial performance of the device, but cannot verify the overall technical indicators of the device. Starting from the short circuit fault of the line, through tripping and fault isolation until the end of load transfer, the inspection device The complete action program provides a test platform for the overall debugging and acceptance of distribution automation devices.

Description of drawings

Fig. 1 is the structure schematic diagram of distribution automation system of the present invention;

Figure 2 is a structural diagram of the 10kV power distribution line in the experimental platform;

Figure 3 is a circuit structure diagram of the simulated power supply transformer and neutral point equipment in the experimental platform;

Figure 4 is a connection circuit diagram of the AC contactor and the controller;

Fig. 5 is a circuit connection diagram of the single-phase grounding test control unit.

Marks in the figure: 1-experimental platform, 2-controller, 3-monitoring center, 11-simulated 10kV distribution line, 12-simulated high-voltage substation power transformer, 13-simulated neutral point equipment, 14-simulated switchgear, 15 - Analog voltage transformer, 16- Analog current transformer, 17- Analog distribution transformer, 18- Analog grounding control unit, 31- Power transformer, 32- Current filter.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

As shown in accompanying drawing 1, the technical performance testing platform of the distribution automation device of the present embodiment includes an experimental platform 1, a controller 2 and a monitoring center 3, the experimental platform 1 is connected to the controller 2, and the controller 2 passes through an optical fiber It is connected with the monitoring center 3; the experimental platform 1 includes a simulated 10kV power distribution line 11, a simulated high-voltage substation power supply transformer 12 and a simulated neutral point device 13, a simulated switchgear 14, a simulated voltage transformer 15 and a simulated current transformer 16, a simulated distribution Electric transformer 17, analog ground control unit 18. In this embodiment, the experimental platform 1, the controller 2, and the monitoring center 3 form a complete distribution automation device technical performance testing platform. The experimental platform 1 generates analog dynamic data of the distribution network according to the test request, and through the communication link The analog dynamic data is sent to the monitoring center 3, thereby forming a complete test environment, which solves the problem that the test environment of the distribution automation device in the prior art is incomplete and cannot obtain complete data. The effect of a complete test on the distribution automation device improves the reliability and safety of the distribution automation device.

Experimental platform 1 uses low-voltage equipment to replace high-voltage equipment, and the test parameters are consistent with high-voltage operating parameters. The experimental platform with safe operation and complete functions is used to simulate various faults on high-voltage operating equipment, which solves the problem of scattered distribution automation equipment points, complex terrain, The situation that the linkage test and acceptance cannot be carried out on site. Among them, the experimental platform 1 can verify the grounding function of the distribution line and simulate the voltage/current operation of the system, simulate different grounding methods of the high-voltage substation power supply transformer and neutral point equipment, and simulate 220V AC contactors instead of section switches and terminal switches. Adapt to the remote control and remote signaling requirements of the spring mechanism and the permanent magnet mechanism, install voltage transformers and current transformers at the analog line switchgear for measurement and protection, and simulate three-phase transformers on each section of the line to verify the identification of protection against inrush currents Ability to simulate single-phase-to-earth test controls.

The experimental platform 1 can verify the grounding and positioning function of the distribution line. As shown in Figure 2, the simulated 10kV distribution line 11 includes a 10kV three-phase circuit, and the 10kV three-phase circuit is divided into multiple section lines by the switchgear. Instead of line impedance, the 10kV line protection generally does not consider the impedance angle, and the short-circuit current of each section can be limited to the calculated value by the resistor, and the resistance R value is configured in the minimum way, and the sensitivity coefficient of the fixed value is checked according to the capacitive current in the line of each section , configure low-voltage capacitors C on the lines of each section to form capacitive current when single-phase grounding, and verify the grounding positioning function. The experimental platform 1 can also simulate the voltage/current operation of the system. Specifically, 0.1kV is used to simulate 10kV, and the voltage simulation ratio is Use 1A to simulate 1kA current, current simulation ratio In this way, the short-circuit capacity of hundreds of MVA can be reduced by 100×1000 times, and the test capacity generally does not exceed 3kVA, so as to observe the voltage/current operation profile of the distribution line.

Experimental platform 1 can simulate different grounding methods of high-voltage substation power supply transformers and neutral point equipment. As shown in Figure 3, the simulated high-voltage substation power supply transformer 12 includes 0.4kV/0.1kV, Y/d-11 small power transformer 31, In the current filter 32 of the simulated grounding transformer, the current filter 32 is a zero-sequence current filter with a rated voltage of 100V and connected according to the three-phase Z-type connection; The inductance coil L, the inductance value of the inductance coil L is slightly smaller than the capacitive reactance value of the line and is linear, the overcompensation conforms to the operation regulations of the arc suppression coil, and the inductance is self-wound according to the required parameters, which is used to simulate the sliding of the neutral point resistance line resistance R, the resistance value of the sliding line resistance R can be adjusted according to needs, and neutral point switch SW ₀ , knife switch K, neutral point voltage transformer TV ₀ , neutral point current transformer TA ₀ ; in small The outlet of the power transformer 31 is connected to the current filter 32 through the neutral point switch SW ₀ , the current filter 32 is connected to the inductance coil L through the first knife switch K _L , and the current filter 32 is connected to the sliding wire resistance through the second knife switch K _R at the same time R connection, the two ends of the inductance coil L are connected to the neutral point voltage transformer TV ₀ , the ends of the inductance coil L and the sliding wire resistance R are both connected to the current transformer TA ₀ , the 10KV analog bus is connected to the voltage transformer TV _m , Neutral point voltage transformer TV ₀ and current transformer TA ₀ are respectively used for measuring zero-sequence voltage and compensation current, using the third voltage transformer TV _m connected to the 10KV analog bus, it can be measured at the open triangle L and N Bus zero sequence voltage. Through the cooperation of the neutral point switch SW ₀ and the knife switch K _L and the knife switch K _R , the above connection can also form the neutral point ungrounded mode, the arc suppressing coil grounded mode and the high resistance grounded mode. Neutral point switch SW ₀ forms neutral point ungrounded mode; closes neutral point switch SW ₀ , closes knife switch K _L , turns off knife switch K _R , forms arc suppression coil grounding mode; closes neutral point switch SW ₀ , close the knife switch K _R and open the knife switch K _L to form a high-resistance grounding mode; E is the common ground terminal of the test bench.

Experimental platform 1 can simulate 220V AC contactor instead of section switch and terminal switch to meet the remote control and remote signaling requirements of spring mechanism and permanent magnet mechanism. As shown in Figure 2, the analog switch equipment 14 includes section switch SW _F , terminal The switch SW _Z , the tie switch SW _L , the section switch SW _F , the terminal switch SW _Z , and the tie switch SW _L are used to connect the lines of each section, and the section switch SW _F , the terminal switch SW _Z , and the analog tie switch SW _L all use 220V AC contactor JC instead, as shown in Figure 4, the connection circuit between AC contactor JC and controller 2 is, the switching value of 220V AC contactor JC is connected to the remote signal value of controller 2, and the switching value of 220V AC contactor JC is The tripping relay TJ and the closing relay HJ are connected to the tripping and closing circuits of the controller 2, and this dedicated circuit is adapted to the remote control and remote signaling requirements of the spring mechanism and the permanent magnet mechanism.

The experimental platform 1 can simulate a voltage transformer and a current transformer at the line switchgear for measurement and protection. The simulated voltage transformer 15 is a 100V/100V voltage transformer. As shown in Figure 2, each line switchgear (section switch SW _F , terminal switch SW _Z , tie switch SW _L ) are respectively equipped with a first voltage transformer TV _ab and a second voltage transformer TV _bc , and the first voltage transformer TV _ab is connected to the line Phases A and B, and the second voltage transformer TV _bc are connected to phases B and C of the line for protection and measurement. The analog current transformer 16 is a zero-sequence current transformer TA ₀ , since the simulated short-circuit current of the test bench has been reduced by 1000 times, the primary current transformer can be omitted, and the primary current of the line is directly connected to the current loop of the controller 2, and the line There are A-phase and C-phase connection terminals D _a and D _c at the middle switch, which are connected to the controller 2; the capacitance current of the test bench 1 is configured according to 1:1, the section switch SW _F , the terminal switch SW _Z , and the contact switch SW The installation point of _L is equipped with a zero-sequence current transformer TA ₀ according to the design transformation ratio, capacity and specified polarity, and the secondary side of the zero-sequence current transformer TA ₀ is connected to the controller 2 .

The experimental platform 1 can simulate the three-phase transformers on the lines in each section to verify the protection's ability to identify inrush currents. Since the 10kV section line protection is characterized by short lines, low fixed values, and no time limit, it is different from the conventional three-stage overcurrent protection. However, avoiding the inrush current can neither increase the setting value nor extend the time limit, and special measures are required to prevent the inrush current from malfunctioning. The simulated distribution transformer 17 is a D/y0 small-capacity three-phase transformer, and several D/y0 small-capacity three-phase transformers are arranged on the section line to verify the ability of the 10kV section line protection to identify inrush current.

The experimental platform 1 can simulate the single-phase grounding test control, as shown in Figure 5, which is a circuit connection diagram of the single-phase grounding test control unit, the simulated grounding control unit 18 includes the grounding time controller SKZ and the slide wire resistance R connected in series with it, The grounding timing controller SKZ controls the on-off timing of the zero-sequence voltage, and the slider resistance R controls the amplitude of the output voltage to meet the test requirements. When the first knife switch K1, the second knife switch K2 and the third knife switch K3 are all closed, a stable metallic grounding is realized; the second knife switch K2 and the third knife switch K3 are closed, and the first knife switch K1 is turned off. Realize stable transition resistance grounding; the first knife switch K1 and the third knife switch K3 are closed, and the second knife switch K2 is opened to realize metallic intermittent arc grounding; the third knife switch K3 is closed, the first knife switch K1, The second knife switch K2 is disconnected to realize the intermittent arc grounding of the transition resistance.

Since the existing technology cannot replace the overall linkage test on site, it is impossible to verify the overall technical indicators of the distribution network automatic device, and it is not allowed to conduct a short-circuit test on the live high-voltage line to verify the technical performance of the distribution network automation device. This embodiment can be used as a distribution network The joint debugging and factory acceptance test platform of automation equipment is suitable for testing distribution network automation equipment in the case of phase-to-phase short circuit or single-phase grounding in the distribution line. The line automatic switch, controller, and monitoring center cooperate to realize fault removal, isolation and automatic The specific test process is as follows:

1. Phase-to-section short circuit test

Line instantaneous fault test

As shown in Figure 2, short-circuit phases A and B (or phases B and C) in each section in sequence, and verify that the switch in the faulty section trips and recloses successfully when there is communication or no communication, and when the communication is normal , the monitoring center 3 display is correct.

permanent failure test

Fixedly short-circuit A and B phases (or B and C phases) in each section of the line in turn, and verify that when there is communication or no communication, the switch in the faulty section can be tripped ~ reclosed ~ tripped and locked, and the contact switch can transfer power to the non-faulty line Successful action program, when the communication is normal, the monitoring center 3 display is correct.

2. Power supply test

Transfer line fault test

During the fault in the upstream section of this line, during the transition from the contact switch, simulate the above operations to verify the action procedures for transient faults, permanent faults, with and without communication. When the communication is normal, the monitoring center 3 will display correctly.

3. Single-phase ground short circuit, cut off, isolation

Single-phase grounding test

In each line section of the line, according to the technical conditions of the contract, as shown in Figure 4, follow the single-phase grounding test procedure, specifically the single-phase grounding test control unit, including the grounding moment controller SKZ and the sliding wire resistance R connected in series with it, The grounding moment controller SKZ controls the on-off moment of the zero-sequence voltage, and the slider resistance (R) controls the amplitude of the output voltage. When the first knife switch K1, the second knife switch K2 and the third knife switch K3 are all Close to achieve stable metallic grounding; close the second knife switch K2 and third knife switch K3, and open the first knife switch K1 to realize stable transition resistance grounding; close the first knife switch K1 and third knife switch K3 When the second knife switch K2 is disconnected, the metallic intermittent arc grounding is realized; the third knife switch K3 is closed, the first knife switch K1 and the second knife switch K2 are disconnected, and the transition resistance intermittent arc grounding is realized. The single-phase grounding test is performed through the above procedure, and the monitoring center (3) sends out a single-phase grounding signal at the time of ×× section ××; disconnect K3, and the monitoring center (3) sends out the signal of ×× section ×× and the single-phase grounding disappears at the time of ××.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (7)

1. distributing automation apparatus technical feature test platform, it is characterized in that: comprise experiment porch (1), controller (2) and Surveillance center (3), described experiment porch (1) is connected with controller (2), and controller (2) is connected with Surveillance center (3) by optical fiber again; Described experiment porch (1) comprises simulation 10kV distribution line (11), simulated high-pressure transformer station supply transformer (12) and simulation neutral point equipment (13), analog switch equipment (14), analog voltage mutual inductor (15) and analog current mutual inductor (16), analog ligand piezoelectric transformer (17), analogue ground control module (18).

2. distributing automation apparatus technical feature test platform according to claim 1, it is characterized in that: described simulation 10kV distribution line (11) comprises 10kV three-phase loop, 10kV three-phase loop is divided into multiple section circuit by switchgear, replaces line impedance by inductance or resistance; And according to capacitance current size in each section circuit, each section circuit configures secondary capacitor (C).

3. distributing automation apparatus technical feature test platform according to claim 1 and 2, is characterized in that: described simulated high-pressure transformer station supply transformer (12) comprises 0.4kV/0.1kV, Y/d-11 small power transformer (31), current filter (32); Simulation neutral point equipment (13) then comprises telefault (L), for simulating the slide wire resistance (R) of neutral resistor, and neutral point switch (SW ₀), disconnecting link (K), neutral point voltage mutual inductor (TV ₀), neutral point current mutual inductor (TA ₀); In power transformer (31) outlet by neutral point switch (SW ₀) connect current filter (32), current filter (32) is connected with telefault (L) and slide wire resistance (R) by disconnecting link (K), and the two ends of telefault (L) connect neutral point voltage mutual inductor (TV ₀), the tail end of telefault (L) and slide wire resistance (R) is all connected with neutral point current mutual inductor (TA ₀).

4. distributing automation apparatus technical feature test platform according to claim 3, is characterized in that: described analog switch equipment (14) comprises block switch (SWF), limit switch (SWZ), interconnection switch (SW _l), block switch (SWF), limit switch (SWZ), interconnection switch (SW _l) for connecting each section circuit, described block switch (SWF), limit switch (SWZ), interconnection switch (SW _l) be 220V A.C. contactor (JC).

5. the distributing automation apparatus technical feature test platform according to claim 1 or 4, it is characterized in that: described analog voltage mutual inductor (15) is 100V/100V voltage transformer (VT), is furnished with the first voltage transformer (VT) (TV respectively in the both sides of each line switching equipment _ab) and the second voltage transformer (VT) (TV _bc), the first voltage transformer (VT) (TV _ab) be connected on A, B phase of circuit, the second voltage transformer (VT) (TV _bc) be connected on B, C phase of circuit; Described analog current mutual inductor (16) is zero sequence current mutual inductor (TA ₀), described block switch (SWF), limit switch (SWZ), interconnection switch (SW _l) mounting points be all furnished with zero sequence current mutual inductor (TA ₀).

6. distributing automation apparatus technical feature test platform according to claim 5; it is characterized in that: described analog ligand piezoelectric transformer (17) is D/y0 low capacity three-phase transformer; described section circuit configures some D/y0 low capacity three-phase transformers, to verify that 10kV section route protection is to the recognition capability of shoving.

7. the distributing automation apparatus technical feature test platform according to claim 1 or 6, it is characterized in that: described analogue ground control module (18) comprises the slide wire resistance (R) of touchdown time controller (SKZ) and series connection with it, described touchdown time controller (SKZ) controls the break-make moment of residual voltage, and described slide wire resistance (R) controls the amplitude of output voltage.