CN112986815A - Circuit and method for testing anti-tripping loop of circuit breaker - Google Patents
Circuit and method for testing anti-tripping loop of circuit breaker Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
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Abstract
The invention relates to a test circuit and a test method of an anti-tripping loop of a circuit breaker, wherein the test circuit comprises a simulated closing loop, an auxiliary contact loop, a large current supply loop and a simulated opening loop; the simulation closing loop simulates the closing action of an anti-tripping loop to be tested according to a closing signal, enters the preparation stage of the tripping action through an auxiliary contact loop, provides a large current for a current coil of the anti-tripping loop after receiving the tripping signal, simulates the tripping action of the anti-tripping loop according to the tripping signal, and detects whether the function of the anti-tripping loop is normal or not according to the simulation test of the closing action and the tripping action. The invention greatly simplifies the testing steps, provides instantaneous large current for the current coil of the anti-tripping loop through the large current supply loop when the brake is switched off, can realize the rapid test of the anti-tripping loop, obviously improves the testing efficiency and has low cost.
Description
Technical Field
The invention relates to the technical field of relay protection of a power system, in particular to a circuit breaker anti-tripping loop test circuit and a test method.
Background
The circuit breaker is one of the most important and complex electric devices in the high-voltage switch equipment of the power system, can switch on and off load current during normal operation, and can rapidly switch off short-circuit current under the action of relay protection when the system has a fault, so that the circuit breaker takes double tasks of control and protection. At present, in the operation process of a power system, a breaker is always conducted due to various accidental reasons, and then a fault tripping condition occurs, if the tripping-preventing loop of the breaker cannot reliably act, the breaker is damaged after being repeatedly connected and disconnected, and the breaker is exploded if the breaker is heavy. Therefore, the circuit breaker must be tested for anti-trip function before commissioning or during routine inspection.
In the prior art, most of the anti-jump loop function tests adopt an anti-jump loop test device, such as an anti-jump loop tester, the test steps are complex, the starting current of a current coil of an anti-jump relay is very large, whether the function of the anti-jump loop normally works or not is often tested by means of a special anti-jump loop test device, and the problems of low test efficiency and high cost generally exist.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of complicated test steps, low test efficiency and high cost caused by using a special anti-jump loop test device in the prior art.
In order to solve the technical problem, the invention provides a circuit breaker anti-tripping loop test circuit, which comprises a simulated closing loop, an auxiliary contact loop, a large current supply loop and a simulated opening loop:
the simulated closing loop comprises a closing relay and a closing relay contact connected with the closing relay, and is used for simulating the closing action of the anti-tripping loop to be tested by controlling the closing relay contact through the closing relay according to a closing signal;
the auxiliary contact loop comprises an auxiliary contact relay and an auxiliary contact relay contact connected with the auxiliary contact relay, and when the switching-on relay contact controls the auxiliary contact relay to start working, the auxiliary contact relay controls the auxiliary contact relay contact to act and enters a preparation stage of switching-off action;
after receiving a brake-separating signal, the large-current supply loop is used for providing large current for a current coil of the anti-tripping loop so as to start the current coil;
the analog brake separating loop comprises a brake separating relay and a brake separating relay contact connected with the brake separating relay, and when the current coil is started, the analog brake separating loop is used for controlling the brake separating relay contact to simulate the brake separating action of the anti-tripping loop through the brake separating relay according to the brake separating signal;
and detecting whether the function of the anti-tripping loop is normal or not according to the simulation test of the switching-on action and the switching-off action.
In an embodiment of the invention, the simulated closing circuit includes a closing contact and a closing relay contact, the closing contact is connected to a protective closing relay of the anti-tripping circuit, the closing relay contact is connected to a normally closed contact of the closing relay and the anti-tripping circuit, when the protective closing relay closes the closing contact, the closing relay is powered through the normally closed contact, and the powered closing relay controls the contact of the closing relay to operate.
In one embodiment of the invention, the contact points of the closing relay comprise a first contact point, a second contact point, a third contact point and a fourth contact point, the first contact point of the closing relay is connected with a joint monitoring device, the second contact point of the closing relay is connected with a closing indicating device, the third contact point of the closing relay is connected with the closing relay, and the fourth contact point of the closing relay is connected with an auxiliary contact point relay.
In one embodiment of the present invention, the auxiliary contact relay contact includes a first contact and a second contact, two ends of the first contact of the auxiliary contact relay are respectively connected to the closing relay contact and the closing relay, and the first contact of the auxiliary contact relay is a normally closed contact; and the second contact of the auxiliary contact relay is connected with the opening relay, and the second contact of the auxiliary contact relay is a normally open contact.
In one embodiment of the invention, the analog switching-off loop comprises a switching-off contact and a switching-off relay contact, the switching-off contact is connected with a protective switching-off relay of the anti-tripping loop, the switching-off relay contact is connected with a second contact of an auxiliary contact relay and a normally open contact of the anti-tripping loop, when the switching-off contact is closed by the protective switching-off relay, the normally open contact and the second contact of the auxiliary contact relay are closed, so that the switching-off relay is powered on, and the powered switching-off relay controls the contact action of the switching-off relay.
In one embodiment of the invention, the switching-off relay contacts comprise a first contact and a second contact, two ends of the first contact of the switching-off relay are respectively connected with the third contacts of the switching-on relay and the switching-off relay, and two ends of the second contact of the switching-off relay are respectively connected with the fourth contacts of the auxiliary contact relay and the switching-on relay.
In one embodiment of the invention, the large-current supply loop comprises a DC voltage module, a capacitor and a diode, wherein the output voltage of the DC voltage module charges the capacitor, and the capacitor and the diode form a discharge loop to provide instantaneous large current for a current coil of the anti-tripping loop during tripping.
In one embodiment of the invention, the voltage switching circuit further comprises a voltage switching relay and a voltage dividing resistor, wherein the voltage switching relay is connected in series with the voltage dividing resistor.
In an embodiment of the present invention, the testing device further includes a protection switching-on relay testing circuit and a protection switching-off relay testing circuit, and before the anti-tripping circuit is subjected to the simulation test, the functions of the protection switching-on relay and the protection switching-off relay are respectively tested whether to be normal or not through the protection switching-on relay testing circuit and the protection switching-off relay testing circuit.
In addition, the invention also provides a method for testing the anti-tripping loop of the circuit breaker, which comprises the following steps:
simulating the closing action of the anti-tripping loop to be tested according to the closing signal;
entering a preparatory stage of opening operation;
after receiving a brake-off signal, providing a large current for a current coil of the anti-tripping loop;
simulating the brake-separating action of the anti-tripping loop according to the brake-separating signal;
and detecting whether the function of the anti-tripping loop is normal or not according to the simulation test of the switching-on action and the switching-off action.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the invention simulates the working states of switching-on and switching-off of the anti-tripping loop by simulating the switching-on loop, the auxiliary contact loop and the switching-off loop, greatly simplifies the testing steps, increases the heavy current supply loop, provides instantaneous heavy current for the current coil of the anti-tripping loop by the heavy current supply loop during switching-off, can realize the rapid testing of the anti-tripping loop, obviously improves the testing efficiency, has low cost, solves the problems of complex testing steps, low testing efficiency and high cost caused by using a special anti-tripping loop testing device in the prior art, and has the advantages of simple principle, low production cost, convenient production and the like, thereby realizing the testing of the anti-tripping loop.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.
Fig. 1 is a schematic circuit diagram of an anti-trip circuit of a circuit breaker according to the present invention.
Fig. 2 is a schematic circuit diagram of a circuit in which a protection closing relay test circuit and a protection opening relay test circuit are omitted in a test circuit of an anti-tripping circuit of a circuit breaker according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a protection closing relay test circuit and a protection opening relay test circuit in a test circuit of an anti-tripping circuit of a circuit breaker according to an embodiment of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
In order to better understand the circuit and the method for testing the anti-trip circuit of the circuit breaker disclosed by the embodiment of the invention, the circuit principle of the anti-trip circuit of the circuit breaker applicable to the invention is described in detail below.
Referring to fig. 1, the anti-tripping circuit of the circuit breaker includes a closing control circuit and an opening control circuit, the closing control circuit includes a positive power supply + KM, a protective closing relay 1K, an anti-tripping first closing contact E4, an anti-tripping second closing contact E5, and a closing coil HQ of the circuit breaker, which are connected in series in sequence, the closing coil HQ of the circuit breaker includes a normally closed contact HF, and when the protective closing relay 1K is closed, the closing coil HQ of the circuit breaker is powered on to perform a closing action; the opening control loop comprises a power supply anode + KM, a protective opening relay 3K, a first tripping contact E8, a current coil FT-I, a second tripping contact E9 and a breaker opening coil TQ which are sequentially connected in series, wherein the breaker opening coil TQ comprises a normally open contact TF, and when the protective opening relay 3K is closed, the breaker opening coil TQ is electrified to perform opening action.
Example one
Based on the circuit breaker anti-tripping loop shown in fig. 1, the embodiment of the invention discloses a circuit breaker anti-tripping loop test circuit. Referring to fig. 2 and 3, the complete test circuit formed in fig. 2 and 3 can be used for testing the anti-trip circuit of the circuit breaker shown in fig. 1, and of course, can also be used for any other circuit breaker product having an anti-trip circuit, and the invention is not limited thereto.
The circuit breaker tripping-prevention loop testing circuit provided by the embodiment comprises a simulated closing loop, an auxiliary contact loop, a large-current supply loop and a simulated opening loop.
During testing, the simulated closing loop simulates the closing action of an anti-tripping loop to be tested according to a closing signal, the auxiliary contact loop enters a preparatory stage of switching-off action, after the switching-off signal is received, a large current is supplied to a current coil of the anti-tripping loop by a large current supply loop so as to start the current coil, meanwhile, the simulated switching-off loop simulates the switching-off action of the anti-tripping loop according to the switching-off signal, and whether the function of the anti-tripping loop is normal or not is detected according to the simulation test of the closing action and the switching-off action.
The auxiliary contact circuit comprises an auxiliary contact relay J1A and an auxiliary contact relay contact which are connected, wherein the auxiliary contact relay contact comprises a first contact J1B and a second contact J1C, and the auxiliary contact relay J1A controls the first contact J1B and the second contact J1C to cooperate to complete the switching of a preparation stage of a closing action and a preparation stage of an opening action, in other words, the switching of the closing action and the opening action is realized.
Further, the first contact J1B is a normally closed contact, the second contact J1C is a normally open contact, and switching between a closing operation and an opening operation is realized through different states of the two contacts.
The simulated closing loop comprises a closing relay K1A and a closing relay contact which are connected, and after receiving a closing signal, the simulated closing loop controls the closing relay contact to simulate the closing action of the anti-tripping loop to be tested through the closing relay K1A according to the closing signal.
Furthermore, the simulated switching-on circuit comprises a switching-on contact and a switching-on relay contact, the switching-on contacts F1 and F2 are connected with a protective switching-on relay 1K of the anti-tripping circuit to be tested, the switching-on relay contact is connected with the switching-on relay K1A and a normally closed contact HF of a switching-on coil HQ of a circuit breaker of the switching-on relay, when the protective switching-on relay 1K is closed, the switching-on contacts F1 and F2 are closed, the switching-on relay K1A is electrified through the normally closed contact HF of the switching-on coil HQ of the circuit breaker, and the electrified switching-on relay K.
Further, the closing relay contacts include a first contact K1B, a second contact K1C, a third contact K1D, and a fourth contact K1E. The first contact K1B is connected with a closed position monitoring device which can be a closed position monitoring lamp; the second contact K1C is connected with a closing indicating device, and the closing indicating device can be a closing indicating lamp; the third contact K1D is connected with a closing relay K1A; the fourth contact K1E is connected to an auxiliary contact relay J1A, and the auxiliary contact relay J1A controls the first contact J1B and the second contact J1C to perform corresponding operations.
Specifically, when a closing test is performed, the closing relay 1K is protected to be closed, closing contacts F1 and F2 are closed, the closing relay K1A is powered through a normally closed contact HF of a closing coil HQ of the circuit breaker, the powered closing relay K1A controls contact motion of the closing relay, namely, a first contact K1B is closed, and a closing monitoring lamp is turned on; the second contact K1C is closed, and a closing indicator lamp is turned on; the third contact K1D is closed, and the closing relay K1A is continuously electrified and kept; the fourth contact K1E is closed, the auxiliary contact relay J1A is electrified, the electrified auxiliary contact relay J1A controls the contact action of the auxiliary contact relay, namely the first contact J1B is opened, the second contact J1C is closed, and at the moment, the preparation stage of the opening action is entered when the simulated closing is completed.
The analog brake separating loop comprises a brake separating relay M1A and a brake separating relay contact which are connected, and after the brake separating signal is received, the analog brake separating loop controls the brake separating relay contact to simulate the brake separating action of the anti-tripping loop to be tested through the brake separating relay M1A according to the brake separating signal.
Further, the simulation separating brake circuit comprises a separating brake contact and a separating brake relay contact, the separating brake contacts F5 and F6 are connected with a protective separating brake relay 3K of the to-be-tested anti-tripping circuit, and the separating brake relay contact is connected with a second contact J1C of the auxiliary contact relay J1A and a normally-open contact TF of the breaker separating brake coil TQ.
Further, the opening relay contact includes a first contact M1B and a second contact M1C. The two ends of the first contact M1B are respectively connected with a third contact K1D of the opening relay M1A and the closing relay K1A, and the two ends of the second contact M1C are respectively connected with a fourth contact K1E of the auxiliary contact relay J1A and the closing relay K1A.
Specifically, when the opening test is carried out, the protective opening relay 3K is closed, the opening contacts F5 and F6 are closed, the second contact J1C of the auxiliary contact relay J1A is closed, so that the opening relay M1A is powered, the powered opening relay M1A controls the contact action of the opening relay, namely the first contact M1B is disconnected, the closing relay K1A is powered off, at the moment, the first contact K1B is disconnected, and the positioning monitoring lamp is turned on; the second contact K1C is disconnected, and the opening indicating lamp is on; the third contact K1D is open; the fourth contact K1E is disconnected, the auxiliary contact relay J1A loses power, the second contact J1C of the auxiliary contact relay J1A is disconnected, the opening relay M1A loses power, and at the moment, the preparation stage of closing action is started while the simulation of opening is finished.
The large current supply loop comprises a DC voltage module, a current limiting resistor R5, a capacitor C2, a diode D1 and a diode D2. The output voltage of the DC voltage module (DC 24V) charges a capacitor C2 through a current limiting resistor R5, and when the switch is switched off, the capacitor C2 forms a discharging loop through diodes D2 and D1 to provide instantaneous large current for the current coil FT-I, so that the current coil FT-I is started.
In addition, the present embodiment further includes a voltage switching circuit, the voltage switching circuit includes a voltage switching relay K1 and a voltage dividing resistor R4, and the voltage switching relay K1 is connected in series with the voltage dividing resistor R4.
Specifically, when the operating voltage of the voltage switching relay K1 selects DC110V, that is, nodes 4-12 are connected, nodes 1-9, 2-10, and 3-11 are connected, resistors R1, R2, and R3 are short-circuited, and the closing relay K1A, the auxiliary contact relay J1A, and the opening relay M1A operate at a normal rated voltage. When the working voltage of the voltage switching relay K1 selects DC220V, namely nodes 8-12 are connected, at the moment, nodes 5-9, 6-10 and 7-11 are connected, and resistors R1, R2 and R3 divide the voltage of the closing relay K1A, the auxiliary contact relay J1A and the opening relay M1A, so that the working voltages of the closing relay K1A, the auxiliary contact relay J1A and the opening relay M1A are not damaged due to overlarge, and different working voltages of the anti-tripping circuit to be tested can be met.
In addition, this embodiment still includes protection combined floodgate relay test circuit and protection separating brake relay test circuit, before carrying out the analogue test to the anti-trip circuit, whether the function of protection combined floodgate relay and protection separating brake relay is normal through protection combined floodgate relay test circuit and protection separating brake relay test circuit respectively.
Specifically, the protection switching-on relay test loop comprises a protection switching-on relay test relay K2 and a protection switching-on relay test button Key1 which are connected, when the protection switching-on relay test button Key1 is pressed, the protection switching-on relay test relay K2 acts, a switching-on contact F1 and a switching-off contact F2 are disconnected, namely a switching-on contact F1 is connected with 24V voltage, and a switching-on contact F2 is connected with a protection switching-on relay test lamp; the protection separating brake relay test loop comprises a protection separating brake relay test relay K3 and a protection separating brake relay test button Key2 which are connected, when the protection separating brake relay test button Key2 is pressed, the protection separating brake relay test relay K3 acts, a separating brake contact F5 and a separating brake contact F6 are disconnected, namely the separating brake contact F5 is connected with 24V voltage, and the separating brake contact F6 is connected with a protection separating brake relay test lamp.
During specific testing, the testing circuit is firstly connected with an anti-tripping loop of the circuit breaker to be tested, and the specific steps are as follows: the node 11 when the closing contact F2 is closed is connected with an anti-tripping first closing contact E4 of the anti-tripping loop to be tested; the contact point of the closing relay is connected with an anti-tripping second closing contact E5 of the anti-tripping loop; the node 11 when the switching-off contact F6 is closed is connected with a first switching-off contact E8 of the anti-tripping loop to be tested; the switching-off relay contact is connected with a tripping-preventing second switching-off contact E9 of the tripping-preventing loop; the jumping position monitoring lamp is connected with a jumping position monitoring contact E6 in the anti-jumping loop; the on-position monitoring lamp is connected with an on-position monitoring contact E7 in the anti-jumping loop.
Then, the protection switching-on relay test button Key1 and the protection switching-off relay test button Key2 are pressed, whether the protection switching-on relay 1K and the protection switching-off relay 3K can normally work is tested, and the anti-tripping loop simulation test is performed after the protection switching-on relay 1K and the protection switching-off relay 3K can normally work is determined, specific test contents are elaborated in detail in the above contents, and the embodiment is not described in detail herein.
According to the anti-tripping circuit, the working states of switching on and switching off of the anti-tripping circuit are simulated through the simulated switching-on circuit, the auxiliary contact circuit and the simulated switching-off circuit, the testing steps are greatly simplified, the large-current supply circuit is additionally arranged, when the switching-off is carried out, instantaneous large current is provided for a current coil of the anti-tripping circuit through the large-current supply circuit, the rapid testing of the anti-tripping circuit can be realized, the testing efficiency is remarkably improved, the cost is low, and the problems that the testing steps are complex, the testing efficiency is low and the cost is high due to the fact that a special anti-tripping circuit testing device is used in the prior art.
Example two
Based on the circuit breaker anti-tripping loop shown in fig. 1, the second embodiment of the invention discloses a testing method of the circuit breaker anti-tripping loop.
The embodiment discloses a method for testing an anti-tripping loop of a circuit breaker, which comprises the following steps:
s100: the simulated closing loop controls a closing relay contact to simulate the closing action of the anti-tripping loop to be tested through a closing relay K1A according to a closing signal;
s200: after the auxiliary contact relay J1A acts due to the closing relay contact, the auxiliary contact relay J1A controls the action of the auxiliary contact relay contact, and enters the preparation stage of the opening action;
s300: after receiving the brake-separating signal, the large-current supply loop provides large current for a current coil FT-I of the anti-tripping loop so as to start the current coil FT-I;
s400: when the current coil FT-I is started, the simulation brake-separating loop controls a contact of the brake-separating relay to simulate the brake-separating action of the anti-tripping loop through the brake-separating relay M1A according to a brake-separating signal;
s500: and detecting whether the function of the anti-tripping loop is normal or not according to the simulation test of the closing action and the opening action.
Specific contents of the test method have been elaborated in the description of the test circuit of the anti-tripping circuit of the circuit breaker, and this embodiment is not described herein again.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. The utility model provides a test circuit in circuit breaker anti-tripping circuit which characterized in that, including simulation combined floodgate return circuit, auxiliary contact return circuit, heavy current supply circuit and simulation separating brake return circuit:
the simulated closing loop comprises a closing relay and a closing relay contact connected with the closing relay, and is used for simulating the closing action of the anti-tripping loop to be tested by controlling the closing relay contact through the closing relay according to a closing signal;
the auxiliary contact loop comprises an auxiliary contact relay and an auxiliary contact relay contact connected with the auxiliary contact relay, and when the switching-on relay contact controls the auxiliary contact relay to start working, the auxiliary contact relay is used for controlling the auxiliary contact relay contact to act and entering a preparation stage of switching-off action;
after receiving a brake-separating signal, the large-current supply loop is used for providing large current for a current coil of the anti-tripping loop so as to start the current coil;
the analog brake separating loop comprises a brake separating relay and a brake separating relay contact connected with the brake separating relay, and when the current coil is started, the analog brake separating loop is used for controlling the brake separating relay contact to simulate the brake separating action of the anti-tripping loop through the brake separating relay according to the brake separating signal;
and detecting whether the function of the anti-tripping loop is normal or not according to the simulation test of the switching-on action and the switching-off action.
2. The circuit breaker trip prevention circuit test circuit of claim 1, wherein: the simulation closing circuit comprises a closing contact and a closing relay contact, the closing contact is connected with a protection closing relay of the anti-tripping circuit, the closing relay contact is connected with the closing relay and a normally closed contact of the anti-tripping circuit, when the protection closing relay enables the closing contact to be closed, the closing relay is electrified through the normally closed contact, and the electrified closing relay controls the closing relay contact to act.
3. The circuit breaker anti-trip loop test circuit according to claim 1 or 2, characterized in that: the contact points of the switching-on relay comprise a first contact point, a second contact point, a third contact point and a fourth contact point, the first contact point of the switching-on relay is connected with a joint monitoring device, the second contact point of the switching-on relay is connected with a switching-on indicating device, the third contact point of the switching-on relay is connected with the switching-on relay, and the fourth contact point of the switching-on relay is connected with an auxiliary contact point relay.
4. The circuit breaker trip prevention circuit test circuit of claim 1, wherein: the auxiliary contact relay contact comprises a first contact and a second contact, two ends of the first contact of the auxiliary contact relay are respectively connected with a closing relay contact and a closing relay, and the first contact of the auxiliary contact relay is a normally closed contact; and the second contact of the auxiliary contact relay is connected with the opening relay, and the second contact of the auxiliary contact relay is a normally open contact.
5. The circuit breaker trip prevention circuit test circuit of claim 1, wherein: the simulation separating brake return circuit includes separating brake contact and separating brake relay contact, the separating brake contact is connected the protection separating brake relay who prevents jumping the return circuit, the second contact of auxiliary contact relay is connected to separating brake relay contact with prevent jumping a normally open contact in return circuit protection separating brake relay makes when the separating brake contact is closed, normally open contact with the second contact of auxiliary contact relay is closed, so that separating brake relay gets electric, and the separating brake relay that gets electric controls the action of separating brake relay contact.
6. The circuit breaker anti-trip loop test circuit according to claim 1 or 5, wherein: the switching-off relay contact comprises a first contact and a second contact, the two ends of the first contact of the switching-off relay are respectively connected with the third contacts of the switching-on relay and the switching-on relay, and the two ends of the second contact of the switching-off relay are respectively connected with the fourth contacts of the auxiliary contact relay and the switching-on relay.
7. The circuit breaker trip prevention circuit test circuit of claim 1, wherein: the high-current supply loop comprises a DC voltage module, a capacitor and a diode, wherein the output voltage of the DC voltage module charges the capacitor, and the capacitor and the diode form a discharge loop to provide instantaneous high current for a current coil of the anti-tripping loop during switching off.
8. The circuit breaker trip prevention circuit test circuit of claim 1, wherein: the voltage switching circuit comprises a voltage switching relay and a divider resistor, and the voltage switching relay is connected with the divider resistor in series.
9. The circuit breaker trip prevention circuit test circuit of claim 1, wherein: the testing device also comprises a protection switching-on relay testing loop and a protection switching-off relay testing loop, and before the anti-tripping loop is subjected to simulation testing, whether the functions of the protection switching-on relay and the protection switching-off relay are normal or not is respectively tested through the protection switching-on relay testing loop and the protection switching-off relay testing loop.
10. A method for testing an anti-tripping loop of a circuit breaker is characterized by comprising the following steps:
simulating the closing action of the anti-tripping loop to be tested according to the closing signal;
entering a preparatory stage of opening operation;
after receiving a brake-off signal, providing a large current for a current coil of the anti-tripping loop;
simulating the brake-separating action of the anti-tripping loop according to the brake-separating signal;
and detecting whether the function of the anti-tripping loop is normal or not according to the simulation test of the switching-on action and the switching-off action.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114756082A (en) * | 2022-04-14 | 2022-07-15 | 帝森克罗德集团有限公司 | Maximum power tracking device of photovoltaic grid-connected inverter control system |
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