CN111711274B - Test fixture at feeder terminal - Google Patents
Test fixture at feeder terminal Download PDFInfo
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- CN111711274B CN111711274B CN202010634003.6A CN202010634003A CN111711274B CN 111711274 B CN111711274 B CN 111711274B CN 202010634003 A CN202010634003 A CN 202010634003A CN 111711274 B CN111711274 B CN 111711274B
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- energy storage
- feeder terminal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/206—Switches for connection of measuring instruments or electric motors to measuring loads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/063—Details concerning the co-operation of many similar arrangements, e.g. in a network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a test tool for a feeder terminal, and belongs to the technical field of auxiliary test of feeder terminals. The test fixture comprises: a power supply loop; a current loop; a control loop: the system comprises an opening control branch and a closing control branch, wherein a control coil of a first relay is arranged on the closing control branch, one end of the closing control branch is used for being connected with a closing control end of a feeder terminal to be detected, and the other end of the closing control branch is grounded; a control coil of the second relay is arranged on the opening control branch, one end of the opening control branch is used for connecting an opening control end of the feeder terminal to be detected, and the other end of the opening control branch is grounded; and the normally closed contact of the second relay is connected in series with the second normally open contact of the third relay and then is connected in parallel with the normally open contact of the first relay. The circuit of the test tool is simple, and the test process is simplified by simulating the states of the circuit and the breaker through the test tool.
Description
Technical Field
The invention relates to a test tool for a feeder terminal, and belongs to the technical field of auxiliary test of feeder terminals.
Background
Nowadays, a feeder terminal FTU of a secondary corollary device of an outdoor pole-mounted circuit breaker has become an important component of a smart grid. The feeder terminal FTU has the functions of remote control, remote signaling and fault detection, and plays roles of overcurrent protection and overvoltage protection through setting current and voltage parameters according to various collected electrical parameter (line voltage, current and the like) information of the current line, so that the aims of fault location, fault isolation and quick power restoration in a non-fault area are fulfilled, and the reliability of power supply is improved. Therefore, testing during the production of the feeder terminal FTU will become a significant concern.
In the prior art, during the testing of feeder terminal FTU semi-finished products and program verification testing, complete set of matched testing actions are carried out through a physical breaker, and due to the fact that the size of the breaker is large, complete set of joint debugging testing is difficult and inconvenient; especially, when program software is repeatedly verified, the testing of the feeder terminal FTU is particularly troublesome.
Disclosure of Invention
An object of this application is to provide a test fixture at feeder terminal for solve current test procedure loaded down with trivial details, inconvenient problem.
In order to achieve the above object, the present application provides a technical scheme of a test fixture for a feeder terminal, including:
the power supply loop is used for supplying power to the feeder terminal to be detected;
the current loop is used for simulating the current in the line so as to be collected by a feeder terminal to be detected;
the control loop comprises a switching-on and switching-off control branch and a switching-on and switching-off branch;
the switching-on and switching-off control branch comprises a switching-off control branch and a switching-on control branch, a control coil of a first relay is arranged on the switching-on control branch, one end of the switching-on control branch is used for being connected with a switching-on control end of a feeder terminal to be detected, and the other end of the switching-on control branch is grounded; a control coil of the second relay is arranged on the opening control branch, one end of the opening control branch is used for connecting an opening control end of the feeder terminal to be detected, and the other end of the opening control branch is grounded;
the opening and closing branch is used for connecting a power supply; and a control coil of a third relay and a normally open contact of the first relay which are connected in series are arranged on the opening and closing branch circuit, and a normally closed contact of the second relay is connected in parallel with the normally open contact of the first relay after being connected in series with a second normally open contact of the third relay.
The technical scheme of the test tool for the feeder terminal has the beneficial effects that: the invention supplies power to the feeder terminal to be detected through the power supply loop, and tests the telemetering function of the feeder terminal to be detected through the circuit in the current loop simulation circuit; testing the remote control function of the feeder terminal to be detected by simulating the state of the circuit breaker through the control loop; and the overcurrent protection and reclosing functions of the feeder line terminal to be detected can be tested according to the combination of the current loop and the control loop. When the remote control function test is carried out, only the opening and closing remote control function of the feeder line terminal is tested, when a closing signal is sent by a feeder line terminal to be detected, a control coil of a first relay is electrified, so that a normally open contact of the first relay is closed, a control coil of a third relay is electrified, a second normally open contact of the third relay is closed, and then a normally closed contact of the second relay and the closed normally open contact of the third relay are communicated with a power supply to supply power for the control coil of the third relay, so that the closing control detection is completed; when the feeder terminal to be detected sends an opening signal, the control coil of the second relay is electrified, the normally closed contact of the second relay is opened, the control coil of the third relay is electrified, and the detection of opening control is completed. When overcurrent protection and reclosing function detection are carried out, opening and closing control is completed by collecting current of a current loop. The circuit of the test tool is simple, and the test process is simplified by simulating the states of the circuit and the breaker through the test tool.
Furthermore, in order to more comprehensively detect the feeder terminal to be detected, the control loop further comprises a remote signaling branch, and the remote signaling branch comprises a branch, a closed branch and a branch which is not stored with energy; a fourth normally closed contact of a third relay is arranged on the branch circuit, one end of the branch circuit is used for connecting a branch acquisition end of the feeder terminal to be detected, and the other end of the branch circuit is grounded; a third normally open contact of a third relay is arranged on the closing branch circuit, one end of the closing branch circuit is used for connecting a closing acquisition end of the feeder terminal to be detected, and the other end of the closing branch circuit is grounded; and an eighth button is arranged on the branch circuit without stored energy, one end of the branch circuit without stored energy is used for connecting the collection end without stored energy of the feeder terminal to be detected, and the other end of the branch circuit without stored energy is grounded.
Furthermore, for accurately simulating the current of the line, the current loop comprises an a-phase positive branch, a B-phase positive branch, a C-phase positive branch, a zero-sequence positive branch and a negative branch shared by the positive branches, the negative branch is provided with a first normally open contact of a third relay, and each positive branch is provided with a corresponding button to control the corresponding positive branch to be connected or disconnected.
Furthermore, in order to realize the controllability of the work of the test tool, a fifth button is further arranged on the opening and closing branch for controlling the connection and disconnection of the power supply.
Furthermore, in order to clearly display the remote control result, the control coil of each relay is provided with an indicator lamp for indicating the charged state of the corresponding control coil.
Further, in order to test the peak power bearing capacity of the feeder terminal to be tested, the control loop further includes: the energy storage motor control system comprises an energy storage motor branch and an energy storage motor control branch;
a control coil of the controller and a fourth relay is arranged on the energy storage motor control branch circuit; the controller samples and connects a junction signal, and the controller outputs and controls a control coil connected with the fourth relay;
the energy storage motor branch is used for connecting an energy storage motor power supply end of the feeder terminal to be detected and a load instrument; a normally open contact of a fourth relay is arranged on the energy storage motor branch circuit; and the controller is used for controlling the normally open contact of the fourth relay to be attracted for a preset time after receiving the closing signal.
Drawings
Fig. 1 is a schematic block diagram of a test fixture embodiment 1 of a feeder terminal of the present invention;
fig. 2 is a schematic diagram illustrating connection between a control circuit and a feeder terminal to be tested in embodiment 1 of the test fixture of the present invention;
fig. 3 is a circuit structure diagram of a test fixture of an embodiment 1 of the feeder terminal of the present invention;
fig. 4 is a schematic block diagram of a test fixture embodiment 2 of the feeder terminal of the present invention;
fig. 5 is a schematic diagram illustrating connection between a control circuit and a feeder terminal to be tested in embodiment 2 of the test fixture of the present invention;
fig. 6 is a schematic circuit diagram of an energy storage motor branch and an energy storage motor control branch in the test fixture of the feeder terminal of the present invention.
Detailed Description
Test fixture embodiment 1 of feeder terminal:
the testing tool of the feeder terminal comprises a current loop, a power supply loop and a control loop as shown in figure 1, wherein the control loop is used for simulating the state of a circuit breaker, sending an instruction through the feeder terminal to be tested to enable the control loop to execute switching-on and switching-off, giving an instruction and testing the remote control function of the feeder terminal to be tested (FTU); meanwhile, the feeder terminal to be detected can also detect the states (the separate position, the combined position and the energy storage state) of the control loop and test the remote signaling function of the feeder terminal to be detected; the current loop is used for simulating the current in the line, so that the feeder line terminal to be detected can detect the current in the current loop, and the remote measuring function, the overcurrent protection function and the reclosing function of the feeder line terminal to be detected are tested; the power supply loop is used for supplying power to the test tool and the feeder terminal to be detected, so that the test tool and the feeder terminal to be detected can work normally.
Specifically, as shown in fig. 2 and 3, the control circuit includes a switching-on/off control branch, a switching-on/off branch, and a remote signaling branch.
The opening and closing control branch comprises an opening control branch and a closing control branch:
a control coil KM1 (with an indicator lamp which is on to indicate that the control coil is electrified) of a first relay is arranged on the closing control branch; one end of the switching-on control branch is used for connecting a switching-on control end of the feeder terminal to be detected, and the other end of the switching-on control branch is connected with a switching-off and switching-on common end (namely, grounded);
a control coil KM2 (with an indicator lamp) of a second relay is arranged on the opening control branch; one end of the opening control branch is used for connecting an opening control end of a feeder terminal to be detected, and the other end of the opening control branch is connected with an opening and closing public end;
the switching-on and switching-off branch circuit is provided with a control coil KM3 (with an indicator lamp) of a third relay and a normally open contact KM1-1 of a first relay which are connected in series; the normally closed contact KM2-1 of the second relay is connected in series with the second normally open contact KM3-2 of the third relay and then is connected in parallel with the normally open contact KM1-1 of the first relay; a self-locking closing button SB5 (fifth button) is also arranged; and the opening and closing branch circuit is used for connecting an external power supply (called power supply L/N for short). When the SB5 is pressed down, the test tool is powered on, and the control coils of all relays are not electrified during power-on;
the remote signaling branch comprises a branch, a closed branch and a branch which does not store energy:
a fourth normally closed contact KM3-4 of a third relay is arranged on the branch circuit, one end of the branch circuit is used for connecting a branch acquisition end of a feeder terminal to be detected, and the other end of the branch circuit is connected with a remote signaling common end (namely, grounded);
a third normally open contact KM3-3 of a third relay is arranged on the closing branch, one end of the closing branch is used for connecting a closing acquisition end of a feeder terminal to be detected, and the other end of the closing branch is connected with a remote signaling common end; if the detected feeder terminal collects KM3-4 as a closed point and KM3-3 as an open point, it indicates that the detected feeder terminal is in an open state (namely, the detected feeder terminal sends an open signal); if the feeder terminal to be detected detects that KM3-4 is an open point and KM3-3 is a closed point, it indicates that the feeder terminal to be detected is in a closed state (namely the feeder terminal to be detected sends a closed signal);
an automatic locking and breaking button SB8 (namely an eighth button) is arranged on the branch circuit without stored energy, one end of the branch circuit without stored energy is used for connecting the collection end without stored energy of the feeder terminal to be detected, and the other end of the branch circuit without stored energy is connected with the remote signaling public end. The condition that the feeder line terminal performs closing action is that the feeder line terminal is in a state of opening and stored energy; the condition of the switching-off action is that the feeder line terminal is in a switching-on state, and the energy storage state does not need to be judged; therefore, in order to facilitate the test operation, the feeder terminal to be tested can always detect the stored energy state, namely SB8 is pressed, and the non-stored energy bit is in the open state, namely, the stored energy is indicated.
The current loop comprises an A-phase positive branch IaB phase positive branch IbC phase positive branch IcZero sequence positive branch I0And a negative branch I shared by the positive branchesnEach positive branch, each negative branch and the current output device (relay protection tester) are connected in series to formAnd the current loop is used for testing the remote measuring function and the overcurrent protection function.
A phase anode branch IaA self-locking closing button SB1 is arranged on the switch and is connected with the negative branch through a banana socket wiring terminal JX 1;
b-phase positive branch IbA self-locking closing button SB2 is arranged on the switch and is connected with the negative branch through a banana socket wiring terminal JX 2;
c-phase anode branch IcA self-locking closing button SB3 is arranged on the switch and is connected with the negative branch through a banana socket wiring terminal JX 3;
zero sequence positive branch I0A self-locking closing button SB4 is arranged on the switch and is connected with the negative branch through a banana socket wiring terminal JX 4;
negative pole branch InThe first normally open contact KM3-1 of a third relay is arranged on the device and is connected with each positive branch through a banana socket wiring terminal JX 5.
The power supply loop comprises two power supply branches, namely a first power supply branch TV-a and a first power supply branch TV-b; the second power supply branch is TV-c and TV-b (AC 220V between TV-a and TV-b and AC220V between TV-c and TV-b), and the first power supply branch and the second power supply branch are connected in parallel.
A self-locking and moving-on button SB6 is arranged on the TV-a of the first power supply branch;
and a self-locking and closing button SB7 is arranged on the TV-c of the first power supply branch.
The input end of the power supply loop is connected with L, N (corresponding to a live wire and a zero wire and being an external commercial power AC220V), the output end of the power supply loop is connected with a feeder terminal to be detected, the live wire is connected with an a-phase power supply end of the feeder terminal to be detected through a sixth button (a self-locking dynamic closing button SB6), the live wire is connected with a c-phase power supply end of the feeder terminal to be detected through a seventh button (a self-locking dynamic closing button SB7), the zero wire is connected with a b-phase power supply end of the feeder terminal to be detected, and when SB6 is pressed and SB7 is not pressed, AC220V is arranged between TV-a and TV-b to supply power to the feeder terminal to be detected; when SB7 is pressed and SB6 is not pressed, AC220V is arranged between TV-c and TV-b to supply power to the feeder terminal to be detected, and only one button of SB6 or SB7 can be selected to be pressed during the test of the feeder terminal to be detected, namely only one power supply branch is selected to supply power.
The detection process of the remote control and remote signaling functions of the feeder terminal to be detected is as follows.
Closing detection: after the SB5 is pressed down, the test tool is powered on, all relays are not electrified at the moment, and the feeder terminal to be detected detects that the telecommand separation KM3-4 is a closed point and the closing KM3-3 is an open point, so that the feeder terminal to be detected is in a brake separation state; since the SB8 is in the normal pressing state and indicates stored energy, the feeder terminal to be detected can be switched on through the body or remote control operation in the state that the switch-off is stored energy;
when the switching-on operation is carried out, a feeder terminal to be detected outputs dozens of milliseconds of switching-on pulses to the switching-on control branch circuit, a control coil KM1 of a first relay has electrified time of dozens of milliseconds, an indicator lamp of the first relay is turned on at the same time, a normally-on point KM1-1 is closed in the electrified time of KM1, a control coil KM3 of a third relay is electrified, an indicator lamp of the third relay is turned on at the same time, normally-on points KM3-1, KM3-2 and KM3-3 of the third relay are closed, and a normally-off point KM3-4 is disconnected. Because the KM3-2 is changed from normally open to closed, a loop formed by the KM2-1, the KM3-2 and an external power supply by a control coil KM3 of the third relay is always in a charged state, and an indicator lamp of the third relay is normally on and represents that a feeder line terminal to be detected is in a closed state. Meanwhile, after the feeder line terminal to be detected is in a closing state, the KM3-4 of the branch line is detected to be an open point, and the KM3-3 of the closing branch line is detected to be a closed point.
Brake opening detection: when the feeder terminal to be detected detects that the KM3-4 of the branch circuit is a normally open point and the KM3-3 of the closed branch circuit is a normally closed point, the state of closing is indicated, and the feeder terminal to be detected can be subjected to opening operation through a body or remote control operation. During switching-off, a feeder terminal to be detected outputs tens of milliseconds of switching-off pulses to the switching-off control branch, a control coil KM2 of the second relay has electrified time of tens of milliseconds, an indicator lamp of the second relay is turned on at the same time, a normally-off point KM2-1 is disconnected within the electrified time of KM2, a control coil KM3 of the third relay is de-energized, normally-off points KM3-1, KM3-2 and KM3-3 are restored to a normally-on point, and an open point KM3-4 is restored to a normally-off point. Meanwhile, the control coil KM3 of the third relay loses power, the indicator lamp of the third relay is turned off, and the feeder line terminal to be detected is in a switching-off state. And after the feeder terminal to be detected is in a switching-off state, the KM3-4 of the branch circuit is detected to be a closed point, and the KM3-3 of the closed branch circuit is detected to be an open point.
The detection processes of the telemetering function, the overcurrent fault protection function and the reclosing function of the feeder terminal to be detected are as follows:
telemetry detection: after the feeder terminal to be detected is switched on, the normally-open point KM3-1 of the third relay becomes a normally-closed point, and current can be output by the relay protection tester and added into the current loop, so that the feeder terminal to be detected can detect the current in the current loop. The relay protection tester outputs current to be added between JX1 and JX5, and SB1 is pressed at the same time, so that the terminal of the feeder line to be detected can detect phase A current; similarly, the output current of the relay protection tester is added between JX2 and JX5, and SB2 is pressed at the same time, so that the phase B current can be detected by the feeder line terminal to be detected; the relay protection tester outputs current to be added between JX3 and JX5, and SB3 is pressed at the same time, so that the C-phase current can be detected by the feeder line terminal to be detected; the output current of the relay protection tester is added between JX4 and JX5, and SB4 is pressed at the same time, so that the zero sequence current can be detected by the feeder line terminal to be detected. If the relay protection tester has multi-path current output, SB1, SB2, SB3 and SB4 are pressed simultaneously, the terminal of the feeder line to be detected can detect A-phase, B-phase, C-phase and zero-sequence currents simultaneously, certainly, if only one phase of current is needed to be detected, other corresponding buttons are directly disconnected, the relay protection output value can be adjusted without adjustment, and the operation is convenient.
Overcurrent fault protection detection: when the feeder terminal to be detected detects that current is overcurrent, the feeder terminal to be detected outputs tens of milliseconds of switching-off pulses to the switching-off control branch circuit, the control coil KM2 of the second relay has the electrified time of tens of milliseconds, a normally-closed point KM2-1 is disconnected within the electrified time of KM2, the control coil KM3 of the third relay is de-electrified, normally-closed points KM3-1, KM3-2 and KM3-3 are restored to a normally-open point, and a normally-open point KM3-4 is restored to a normally-closed point. Because the normally-closed point KM3-1 is restored to the normally-open point, the current loop is directly cut off, and the current value of each line detected by the feeder terminal to be detected is zero, which simulates that the line is cut off after the circuit breaker is opened in the actual line, and the line has no current any more.
Detection of reclosure: after the feeder terminal to be detected detects overcurrent fault tripping, the current loop is cut off, and then the reclosing function of the line can be simulated, and the reclosing detection and the closing detection are the same, which is not described herein again.
In the above embodiment, in order to approach the line current more, the current loop simulates the current that may appear on the line, which is more practical, as another embodiment, only one current branch or two current branches may be provided, and the number and form of the current branches are not limited in the present invention.
In the above embodiment, in order to more comprehensively detect the feeder terminal to be detected, the control loop is provided with the remote signaling branch, and as another embodiment, the remote signaling branch may not be provided on the basis of only detecting the remote control function.
The self-locking dynamic closing button SB5 on the switching-on/off branch circuit can be omitted as long as the test tool is directly connected with the terminal of the feeder line to be detected for detection, and the setting significance lies in that the electrification of the test tool is controllable.
In the above embodiment, in order to facilitate the identification of the switching-on control by the tester, the control coil of each relay is provided with an indicator lamp, the control coil is electrified, and the indicator lamp is turned on.
The test tool completes comprehensive detection of the remote measuring function, the remote control function, the remote signaling function, the overcurrent protection function and the reclosing function of the feeder terminal to be detected, and is simple in structure, convenient to test and capable of improving the test efficiency better.
Test fixture embodiment 2 of feeder terminal:
the difference between the test fixture for the feeder terminal provided in this embodiment and the test fixture for the feeder terminal in embodiment 1 is that, as shown in fig. 4, an energy storage loop simulation branch is added in the control loop of this embodiment, the energy storage loop simulation branch includes an energy storage motor branch and an energy storage motor control branch, and the energy storage motor branch is connected with a load meter, so that the peak condition of energy storage of the energy storage motor can be simulated to test the peak power bearing capacity of the feeder terminal to be tested.
The reason for simulating the peak condition of energy storage of the energy storage motor is as follows: after a feeder line terminal successfully passes the test of remote signaling, remote control, remote measurement, overcurrent protection and reclosing functions, the energy storage of an energy storage motor is unsuccessful in the process of joint adjustment of the feeder line terminal and a complete set of circuit breaker, so that the phenomenon that the complete set of circuit breaker cannot be normally driven to open and close is caused; the phenomenon occurs because when the energy storage motor power end of the feeder terminal outputs voltage to store energy for the energy storage motor of the circuit breaker set, the energy storage motor has a peak current of about tens of milliseconds in the whole energy storage process, and the excessive peak current causes the overcurrent of the switch power supply in the feeder terminal to protect, and the feeder terminal does not output the switching-on/off control power supply and the energy storage power supply any more, and can not normally control the switching-on/off and energy storage output. Therefore, the energy storage loop simulation branch is added in the control loop to simulate the peak power of the energy storage motor.
The energy storage loop simulation branch is shown in fig. 5 and 6 and comprises an energy storage motor branch and an energy storage motor control branch;
a controller (a main control MCU) and a control coil KM4 of a fourth relay are arranged on the energy storage motor control branch; the input end of the controller is connected with the joint position sampling branch circuit and used for receiving the joint position signal, the output end of the controller is connected with one end of a control coil of a fourth relay, and the other end of the control coil of the fourth relay is grounded; meanwhile, the controller is connected with a display screen, and the preset suction time of the fourth relay is set through the display screen;
the energy storage motor branch comprises an energy storage motor positive branch and an energy storage motor negative branch, and a normally open contact KM4-1 of a fourth relay is arranged on the energy storage motor positive branch; one end of the positive branch of the energy storage motor is connected with the positive end of the energy storage motor power supply of the feeder terminal to be detected (the positive end of the energy storage motor for short), and the other end of the positive branch of the energy storage motor is connected with a load instrument; one end of the energy storage motor negative pole branch is connected with an energy storage motor power supply negative pole end (energy storage motor negative pole for short) of the feeder terminal to be detected, and the other end of the energy storage motor negative pole branch is used for being connected with a load instrument.
The set basis of the peak power of the load instrument and the preset pull-in time of the fourth relay are as follows: the energy storage peak current and the peak duration of each energy storage motor of each manufacturer are tested by using an oscilloscope, and then the peak power is calculated through UxI.
The testing process of the peak power bearing capacity of the feeder terminal to be detected comprises the following steps: setting the required peak power through a load meter; the duration of the peak power is set through the display screen, after the master control MCU memorizes the duration, and after the master control MCU detects a closing signal (indicating that the stored energy is released), the master control MCU outputs the pull-in preset duration (the duration is the same as the duration of the peak power) of the fourth relay, controls the control coil KM4 of the fourth relay to be electrified within the pull-in preset duration, further controls the normally open contact KM4-1 of the fourth relay to be pulled in within the pull-in preset duration, connects the load instrument with the feeder terminal to be detected within the pull-in preset duration, and detects whether the feeder terminal can bear the peak power of the energy storage motor. If the switch-on and switch-off control of the feeder terminal is normal after the load instrument is connected to the feeder terminal to be detected and energy is stored, it indicates that the switch-on and switch-off of the complete set of circuit breakers can be normally driven by the internal switch power supply of the feeder terminal to be detected, otherwise, it indicates that the switch-on and switch-off of the complete set of circuit breakers cannot be normally driven by the feeder terminal to be detected. The opening and closing control is the same as the opening and closing control process in embodiment 1, and details are not described here.
Regarding the setting position of the normally open contact KM4-1 of the fourth relay, the present invention is not limited, as long as the setting position is set on the energy storage branch, the load meter can be connected with the feeder terminal to be detected, for example: the normally open contact KM4-1 of the fourth relay can also be arranged on the negative pole branch of the energy storage motor.
The detection of the telemetry function, the remote control function, the remote signaling function, the overcurrent protection function, and the reclosing function of the feeder terminal to be detected is described in embodiment 1 above, and will not be described herein.
The test tool is additionally provided with the energy storage loop simulation branch circuit, tests the bearing capacity of the feeder terminal and comprehensively detects the feeder terminal.
Claims (4)
1. The utility model provides a test fixture at feeder terminal which characterized in that includes:
the power supply loop is used for supplying power to the feeder terminal to be detected;
the current loop is used for simulating the current in the line so as to be collected by a feeder terminal to be detected;
the control loop comprises a switching-on and switching-off control branch and a switching-on and switching-off branch;
the switching-on and switching-off control branch comprises a switching-off control branch and a switching-on control branch, a control coil of a first relay is arranged on the switching-on control branch, one end of the switching-on control branch is used for being connected with a switching-on control end of a feeder terminal to be detected, and the other end of the switching-on control branch is grounded; a control coil of the second relay is arranged on the opening control branch, one end of the opening control branch is used for connecting an opening control end of the feeder terminal to be detected, and the other end of the opening control branch is grounded;
the opening and closing branch is used for connecting a power supply; a control coil of a third relay and a normally open contact of the first relay which are connected in series are arranged on the opening and closing branch circuit, and a normally closed contact of the second relay is connected in series with a second normally open contact of the third relay and then connected in parallel with the normally open contact of the first relay;
the control circuit also comprises a remote signaling branch, and the remote signaling branch comprises a position dividing branch, a position closing branch and an energy-accumulating-free branch; a fourth normally closed contact of a third relay is arranged on the branch circuit, one end of the branch circuit is used for connecting a branch acquisition end of the feeder terminal to be detected, and the other end of the branch circuit is grounded; a third normally open contact of a third relay is arranged on the closing branch circuit, one end of the closing branch circuit is used for connecting a closing acquisition end of the feeder terminal to be detected, and the other end of the closing branch circuit is grounded; an eighth button is arranged on the branch circuit without stored energy, one end of the branch circuit without stored energy is used for connecting the collection end without stored energy of the feeder terminal to be detected, and the other end of the branch circuit without stored energy is grounded;
the control loop further comprises: the energy storage motor control system comprises an energy storage motor branch and an energy storage motor control branch;
a control coil of the controller and a fourth relay is arranged on the energy storage motor control branch circuit; the controller samples and connects a junction signal, and the controller outputs and controls a control coil connected with the fourth relay;
the energy storage motor branch is used for connecting an energy storage motor power supply end of the feeder terminal to be detected and a load instrument; the energy storage motor power supply end of the feeder terminal to be detected comprises an energy storage motor power supply positive end and an energy storage motor power supply negative end, the energy storage motor branch comprises an energy storage motor positive branch and an energy storage motor negative branch, a normally open contact of a fourth relay is arranged on the energy storage motor positive branch, one end of the energy storage motor positive branch is connected with the energy storage motor power supply positive end, and the other end of the energy storage motor positive branch is connected with a load instrument; one end of the energy storage motor negative pole branch is connected with the energy storage motor power supply negative pole end, and the other end of the energy storage motor negative pole branch is used for being connected with a load instrument; the load meter is used for setting peak power to simulate the peak condition of energy storage of the energy storage motor; and the controller is used for controlling the normally open contact of the fourth relay to be attracted for a preset time after receiving the closing signal.
2. The feeder terminal testing tool according to claim 1, wherein the current loop comprises an a-phase positive branch, a B-phase positive branch, a C-phase positive branch, a zero-sequence positive branch and a negative branch shared by the positive branches, the negative branch is provided with a first normally open contact of a third relay, and each positive branch is provided with a corresponding button to control the corresponding positive branch to be turned on or off.
3. The feeder terminal testing tool as claimed in claim 1, wherein a fifth button is further disposed on the switching-on/off branch for controlling connection and disconnection of a power supply.
4. The test fixture of a feeder terminal of claim 1, wherein the control coil of each relay is configured with an indicator light for indicating the charging state of the corresponding control coil.
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| CN112345971B (en) * | 2020-10-27 | 2022-03-08 | 深圳创维－Rgb电子有限公司 | FFC wire rod detection circuitry and detection frock |
| CN112731248B (en) * | 2020-12-29 | 2023-08-08 | 国网四川省电力公司电力科学研究院 | Electronic power distribution automation feeder terminal test conversion device |
| CN114184951B (en) * | 2021-12-14 | 2023-05-26 | 烟台东方威思顿电力设备有限公司 | Breaker spring operating mechanism simulation system |
| CN117878822A (en) * | 2024-03-12 | 2024-04-12 | 国网山东省电力公司安丘市供电公司 | Relay protection conversion device, circuit detection method and teaching method |
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