CN220367356U - Device for detecting correctness of installation phase sequence of secondary fusion circuit breaker - Google Patents

Abstract

The utility model discloses a phase sequence correctness detection device for installation of a secondary fusion breaker, which comprises a unidirectional intelligent ammeter for detecting the phase sequence of the secondary fusion breaker, wherein the secondary fusion breaker is connected with a high-voltage bus, the secondary fusion breaker comprises a PT transformer and a breaker main body, the input end of the high-voltage bus is connected with a transformer, the transformer is connected with a first grounding wire, the output end of the breaker main body is connected with an electrical appliance load, the electrical appliance load is connected with a second grounding wire, a relay is arranged between the first grounding wire and the second grounding wire, and the control end of the relay is electrically connected with the unidirectional intelligent ammeter. The intelligent power supply device can be matched with the PT transformer for supplying power, the single-phase intelligent ammeter can detect the correctness of the phase sequence of the voltage current signal of the PT at the incoming line side, namely, whether the phase sequence of the circuit breaker is connected with errors or not can be detected, reworking can be performed in time, the failure rate of the main body of the circuit breaker is reduced, and the safety of a circuit is protected.

Description

A device for detecting phase sequence correctness of installation of primary and secondary fused circuit breakers

Technical field

The utility model relates to a phase sequence detection device, in particular to a phase sequence correctness detection device for primary and secondary fusion circuit breakers.

Background technique

In production and daily electricity consumption, when the three-phase load on the circuit breaker is unbalanced, the transformer will operate in an asymmetrical state. Causes the loss of the transformer to increase (including no-load loss and load loss). In addition, unbalanced operation of the three-phase load will cause the zero-sequence current of the transformer to be too large, increase the temperature of local metal parts, and even cause the transformer to burn out. The imbalance between phases will also shorten the service life of electrical equipment, accelerate the replacement frequency of equipment parts, and increase the cost of equipment maintenance. The margin of current allowed by the circuit breaker is reduced, and overload and short circuit phenomena are prone to occur when the load changes or alternates. Excessive unbalanced current flows into the neutral wire, causing the neutral wire to thicken.

Utility model content

The utility model aims to solve the above-mentioned problems existing in the prior art and provides a phase sequence correctness detection device for the installation of a primary and secondary fusion circuit breaker. The detection device is powered by PT for detection and can detect whether the phase sequence is correct in time and reduce the risk of circuit breakers. Main body failure rate, protecting circuit safety.

The technical solution adopted by the utility model to solve the technical problem is: a device for detecting the phase sequence correctness of the primary and secondary fusion circuit breaker installation, including a one-way smart meter for detecting the phase sequence of the primary and secondary fusion circuit breaker. The circuit breaker is connected to the high-voltage busbar. The primary and secondary integrated circuit breaker includes a PT transformer and a circuit breaker main body. The high-voltage busbar, the circuit breaker main body, the PT transformer and the one-way smart meter are electrically connected in sequence. The input end of the busbar is connected to the transformer, the transformer is connected to the first ground wire, the output end of the circuit breaker body is connected to the electrical load, the electrical load is connected to the second ground wire, a relay is provided between the first ground wire and the second ground wire, and the relay The control end is electrically connected to the one-way smart meter.

For further improvement, the one-way smart meter is connected to the PT transformer through a detection extension cable and an aviation plug. The detection extension cable uses a 6-core shielded 1.5 square millimeter cable. The detection extension cable is used for the incoming side PT of the circuit breaker body for detection on the ground. The phase sequence correctness of the voltage and current signals.

For further improvement, the main body of the circuit breaker is provided with a TTU monitoring terminal connected to the one-way smart meter. The TTU monitoring terminal is used to output signals of Ia, Ib, Ic, Uab, P, Q, and COS￠.

For further improvement, a leakage current transformer is provided between the main body of the circuit breaker and the electrical load, and the leakage current transformer is electrically connected to the one-way smart meter.

For further improvement, the one-way smart meter is connected to an oscilloscope or a host computer, and the host computer communicates with the transformer.

The beneficial effects of the utility model are: the utility model can be matched with a PT transformer for power supply, and the single-phase smart meter can detect the correctness of the phase sequence of the voltage and current signals of the incoming line side PT, that is, it can detect whether the phase sequence of the circuit breaker is connected incorrectly. Rework in time to reduce the failure rate of the circuit breaker body and protect circuit safety.

Description of the drawings

Figure 1 is a functional block diagram of the circuit of the present utility model;

Figure 2 is a schematic diagram of the appearance of a ZW32-12 circuit breaker;

Explanation of reference signs: 1. Incoming line terminal, 2. Outgoing line terminal, 3. PT transformer, 4. Leakage current transformer.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings:

Refer to the accompanying drawings: In this embodiment, a device for detecting the correctness of the phase sequence of the primary and secondary fusion circuit breaker installation includes a one-way smart meter for detecting the phase sequence of the primary and secondary fusion circuit breaker. The primary and secondary fusion circuit breaker is connected to high voltage. The busbar, the primary and secondary integrated circuit breaker includes a PT transformer and a circuit breaker body. The high-voltage busbar, the circuit breaker body, the PT transformer and the one-way smart meter are electrically connected in sequence. The input end of the high-voltage busbar Connect the transformer, the transformer is connected to the first ground wire, the output end of the circuit breaker body is connected to the electrical load, the electrical load is connected to the second ground wire, a relay is provided between the first ground wire and the second ground wire, and the control end of the relay is connected to the second ground wire. One-way smart meter electrical connection. During normal operation, the high-voltage bus is energized, the main body of the circuit breaker is turned on, the main body of the circuit breaker outputs electric energy to the electrical load, and the one-way smart meter of the low-voltage load in this section of the PT transformer provides voltage. A ground fault occurs in either of the first ground wire and the second ground wire. If the ground point of the line is disconnected and a single phase is grounded, it will cause a three-phase voltage imbalance. The one-way smart meter detects the phase sequence imbalance and controls the relay. The conduction improves the connection between the first ground wire and the second ground wire. The charge is dispersed and connected to different ground points to reduce the problem of serious imbalance caused by concentrated grounding. Improved electrical load safety.

The one-way smart meter adopts an existing technology product (CN201610993457.6 single-phase smart meter). The one-way smart meter is connected to the PT transformer through a detection extension cable and an aviation plug. The detection extension cable uses a 6-core shielded 1.5 square millimeter cable. The detection extension cable is used to detect the voltage and current of the PT on the incoming side of the circuit breaker body on the ground. The phase sequence of the signal is correct. The main body of the circuit breaker is provided with a TTU monitoring terminal connected to the one-way smart meter. The TTU monitoring terminal is used to output signals of Ia, Ib, Ic, Uab, P, Q, and COS￠. A leakage current transformer is provided between the main body of the circuit breaker and the electrical load, and the leakage current transformer is electrically connected to the one-way smart meter.

The one-way smart meter is connected with an oscilloscope or a host computer, and the host computer communicates with the transformer. Staff can clearly observe phase current waveforms through an oscilloscope to ensure detection accuracy. After receiving the voltage data, the host computer sends instructions to the transformer control machine through communication equipment to adjust the transformer gear in time to improve power consumption efficiency.

Although the present invention has been illustrated and described with reference to preferred embodiments, it will be understood by those of ordinary skill in the art that various changes in form and details may be made within the scope of the claims.

Claims (5)

1. A device for detecting the correctness of the phase sequence of the primary and secondary fusion circuit breakers installed, including a one-way smart meter used to detect the phase sequence of the primary and secondary fusion circuit breakers. The primary and secondary fusion circuit breakers are connected to the high-voltage bus, and the primary and secondary fusion circuit breakers are The circuit breaker includes a PT transformer and a circuit breaker body, which is characterized in that: the high-voltage bus, the circuit breaker body, the PT transformer and the one-way smart meter are electrically connected in sequence, and the input end of the high-voltage bus is connected to the transformer. , the transformer is connected to the first ground wire, the output end of the circuit breaker body is connected to the electrical load, the electrical load is connected to the second ground wire, a relay is provided between the first ground wire and the second ground wire, and the control end of the relay is connected to the one-way Smart meter electrical connection. 2. A primary and secondary fusion circuit breaker installation phase sequence correctness detection device according to claim 1, characterized in that: the one-way smart meter connects the PT transformer by detecting the extension cable and the aviation plug, and detects the extension cable Using a 6-core shielded 1.5 square millimeter cable, the extension cable is used to detect the correctness of the phase sequence of the voltage and current signals of the incoming side PT of the circuit breaker body on the ground. 3. A primary and secondary fusion circuit breaker installation phase sequence correctness detection device according to claim 1, characterized in that: the main body of the circuit breaker is provided with a TTU monitoring terminal connected to a one-way smart meter, and the TTU The monitoring terminal is used to output the signals of Ia, Ib, Ic, Uab, P, Q and COS￠. 4. A primary and secondary fusion circuit breaker installation phase sequence correctness detection device according to claim 1, characterized in that: a leakage transformer is provided between the circuit breaker body and the electrical load, and the leakage transformer is connected to the single Electrically connected to the smart meter. 5. A primary and secondary fusion circuit breaker installation phase sequence correctness detection device according to claim 1, characterized in that: the one-way smart meter is connected to an oscilloscope or a host computer, and the host computer is connected to the transformer for communication .