74 trip circuit supervision relay

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Trip circuit supervision relay – Reyrolle 7PJ13

Trip Circuit Supervision Relay Working principle and connection diagram.

• HT Protection Relay
• Trip circuit supervision Relay
• Trip circuit supervision relay.
• Connection diagram of TCS relay.
• Working principle.

1 - Trip circuit supervision relay:

The trip circuit supervision relay is a monitoring relay and it is known as numerical name 96 S. it is used for continuous monitoring of breaker trip circuit healthy or not healthy in HT panel in any premised or substation. If the trip circuit will not ok then it will provide an alarm for avoiding any fault. In an electrical panel trip circuit of the circuit breaker is critical. During fault conditions If the trip circuit did not find any trip sensing then the breaker will not be disconnected and the resultant by this problem may be a very loss. So, keeping the trip circuit healthy the TCS relay is used so that system always remains healthy. The trip circuit supervision relay is used in the HT panel for continuous monitoring of breaker trip circuit healthy. If the circuit is not healthy or abnormality in the trip circuit then it will activate to alarm.

The reason may be Trip circuit for unhealthy:

Many contacts are connected in series along a trip circuit of an electrical circuit breaker.

• Loss of breaker auxiliary supply.
• Low gas pressure in SF6 breaker.
• Abnormal vacuum pressure in VCB.
• Trip circuit supervision relay also may be faulty.

2 - Connection diagram of trip circuit supervision relay.

3 - Working principle of TCS relay.

TCS relay working principle has many important points given below mentioned.

• Monitoring the complete trip circuit of the circuit breaker.
• Identify the faults in the supervised circuits, like the not available voltage, the circuit to be open, contact flashing in connections, and resistance abnormal in wires, contacts, and trip coils.
• C. Low-level measuring current enables application in sensitive or high resistance circuits.
• False signals are avoided for circuit breaker smooth operations.
• Operation indication by a single dual-color LED Complete range of rated voltages either AC or DC.
• Galvanic isolation is possible between auxiliary source and supervised circuit Very low burden on the auxiliary source.

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• What is the HT panel protection relay, types and connection diagram?

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Trip Circuit Supervision TCS Relay Working Function and Operation

Trip circuit supervision relay working function:.

Trip circuit supervision relays are used to monitor the trip coil of the circuit breaker. It just checks the coil healthiness. Because trip coils operation is a final process of the power system protection. So we must check the trip coil in a circuit breaker. If your breaker contains N number of circuit breaker’s trip coil, then you should use N number of trip coil sensitivity relays. Typically, each breaker panels are manufactured with individual trip coil super vision relays.[wp_ad_camp_1]

Function of Trip Coil Supervision Relays:

Generally trip coils are connected with the negative extention mode (negative terminal directly given to the one of the relay terminal). Therefore, A relay coil (supervision relay coil) is connected in series with the trip coil circuit . Please refer the diagram for better understanding. In the diagram supervision relay coil is connected with the trip coil and trip coils one terminal is connected with the negative point and another terminal (positive) is connected with the protection relay s. Here if the protection relays operate then the relay gets the positive potential, the relay immediately operates the circuit breaker. But in our supervision circuit is connected in series with the trip coil. the positive terminal is joint with the negative terminal of the super vision relay. Another terminal of the supervision relay is connected to the Source +ve terminal. Therefore, if the trip coil is good then the supervision relay will be healthy, otherwise it does not allow to close the breaker if the breaker in open condition , or it trip the circuit breaker if the breaker in closed condition.

Note: Here the Trip coil has High impedance and trip supervision coil has low impedance.

Key Points:

• Trip Supervision relays are nothing but a monitoring relays, it does not contribute of power system protection
• The relay code for these supervision relay is 96 S.
• In power system all of the important protection coils are having its own coil supervision relays.
• It is called in short form of TCS (Trip Circuit Supervision)
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Mastering Trip Circuit Supervision: A Comprehensive Guide to ABB TCS Auxiliary Relay

• Post author: piyush
• Post published: December 14, 2023
• Post category: ABB

Welcome to our comprehensive guide on mastering Trip Circuit Supervision (TCS) using the ABB TCS Auxiliary Relay. In the realm of electrical systems and equipment, ensuring reliable and safe operations is paramount. Trip Circuit Supervision plays a pivotal role in maintaining the integrity and functionality of protection circuits within power systems. The ABB TCS Auxiliary Relay stands as a fundamental component in this domain, offering robust monitoring capabilities and contributing to the overall reliability of protective schemes.

Throughout this blog series, we delve deep into the intricacies of TCS and explore how the ABB TCS Auxiliary Relay serves as a vital tool in supervising trip circuits effectively. From understanding the core principles and significance of TCS to exploring the technical aspects and functionalities of the ABB relay, this guide aims to provide an insightful and comprehensive resource for engineers, technicians, and enthusiasts in the field of electrical engineering. Join us as we uncover the nuances of trip circuit supervision, uncover the functionalities of the ABB TCS Auxiliary Relay, and empower you with the knowledge needed to ensure robust and secure operations within power systems.

Overview of ABB TCS Auxiliary Relay:

The ABB TCS Auxiliary Relay is a specialized component designed to enhance the effectiveness of trip circuit supervision in electrical systems. It acts as a pivotal element in the supervision process, providing advanced monitoring capabilities to ensure the reliability and proper functioning of protective circuits. ABB’s TCS relay is engineered with advanced features and technology, meeting industry standards and offering a comprehensive solution to efficiently supervise trip circuits, contributing significantly to the safety and efficiency of electrical infrastructure.

 Features Of ABB Tcs Trip Circuit Supervision

• Delaying the operation to prevent false signals, such as during circuit breaker operations.
• Complete range of rated voltages either AC or DC
• Utilizing low-level measuring currents allows for application in circuits that are sensitive or possess high resistance.
• It’s feasible to achieve galvanic isolation between the auxiliary power source and the monitored circuit.
• Operation indication by a single dual-colour LED
• Very low burden on the auxiliary source
• Continuously supervising the entire trip circuit without being reliant on the circuit breaker’s position.
• Identifies issues within the monitored circuits, such as voltage loss, circuit interruptions, deterioration of contacts, and increased resistance in wires, contacts, and coils.

Application Of ABB TCS Trip Circuit Supervision Relay 

In a protection system, the proper functioning of a circuit breaker’s tripping mechanism holds significant importance. If there’s an interruption in the trip circuit, it could lead to a situation where a potential network fault remains connected, requiring other protection mechanisms further up in the power system to clear the fault. The supervision function becomes especially crucial when there’s reliance on a single tripping coil, and the circuit breaker’s tripping action is essential. This scenario commonly occurs in critical settings such as generator circuit breakers or other pivotal circuit breakers within distribution networks.

Supervision Relay

The TCS supervision relay is designed for continuous monitoring of a circuit breaker’s trip circuit. It provides an alarm for various issues including loss of auxiliary supply, faults in the trip coil or its wiring, irrespective of the breaker’s position, faults in the breaker’s auxiliary contacts, and faults within the supervision relay itself. Trip circuit supervision is critical as its failure might lead to the persistence of a network fault, necessitating intervention from upstream protection mechanisms.

Under normal circumstances, the LED indicator shines green, and the output relays remain engaged. However, in the event of a fault, the supervision relay triggers (disengages) after a 0.6-second delay, turning the indicator LED red.

Main Benefits 

• Personnel as well as power system safety
• Highly reliable
• Easy site installation

TCS Relay Product Range 

• Contact configuration: 1NO+1NC+2C/O
• PN8nCH2J, RXTCS, UVT92M,TCS
• Rated voltage: 24V DC, 30V DC, 48V DC, 100-125V AC/DC, 220-250V AC/DC

In conclusion, the journey through understanding Trip Circuit Supervision and the functionalities of the ABB TCS Auxiliary Relay has been illuminating. We’ve explored the critical role played by TCS in safeguarding power systems, ensuring prompt fault detection, and preventing false trips. The ABB TCS Auxiliary Relay emerges as a sophisticated and reliable device, offering comprehensive supervision capabilities that contribute to the overall reliability and safety of electrical installations. Its ability to monitor trip circuits, detect faults, and provide timely alerts stands as a testament to its significance in maintaining the integrity of protective schemes within power systems.

As we wrap up this comprehensive guide, it’s important to emphasize the pivotal role that continuous learning and staying updated with technological advancements play in the field of electrical engineering. Understanding and mastering tools like the ABB TCS Auxiliary Relay not only enhances operational efficiency but also ensures a safer and more reliable power infrastructure. With a solid understanding of trip circuit supervision and the functionalities of the ABB relay, engineers and technicians are better equipped to handle challenges, troubleshoot issues effectively, and contribute to the seamless functioning of power systems, thereby making significant strides towards a more resilient and secure electrical grid.

As industry leaders in Digital and Smart Grid Enterprises, we take immense pride in our prominent position as suppliers and exporters of the ABB TCS Auxiliary relay in Mumbai, Maharashtra. Our offerings go beyond mere products; they encompass an extensive range of services and customized solutions tailored for various industries and panel builders. If you have any inquiries or need additional information, please feel free to contact us at +91702162402  or via email at [email protected] . Explore our diverse collection of ABB Auxiliary Relay products by clicking here . We eagerly look forward to the opportunity to further assist you in fulfilling your specific requirements.

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Trip Circuit Supervision TCS Relay Working Function & Operation

Trip circuit supervision monitors and indicates the healthiness of the breaker’s tripping circuit and indicates whether or not the circuit breaker will trip at a fault. If the relay shows a faulty trip circuit, then the user can switch off the breaker at normal load and attend the problem. If not attended and during that time a fault happens in the circuit then the breaker will not trip and it may cause severe damage to the electrical system.

A breaker is used to switch on and switch off the circuit. The breaker must trip in case of a fault in the electrical network. In order to perform the closing, opening, and tripping operation, a breaker has two coils namely the closing coil and the tripping coil. The tripping of the breaker in the event of a fault is a must to safeguard the electrical network and the equipment connected to the outgoing side of the breaker.

The healthiness of the tripping circuit should be always intact to get the tripping of the breaker without fail. The trip circuit supervision of the breaker always checks the healthiness of the breaker’s tripping circuit. The tripping circuit of the breaker has mainly a 110 volts DC tripping coil,110 VDC source, and the 110 VDC to tripping coil connecting wires. If the tripping circuit is healthy the breaker will definitely trip in the case of the fault.

The breaker gets closed if the trip circuit supervision relay outputs its contact. The breaker will not close if there is a fault in the trip circuit. When a breaker is closed and a fault is sensed in running condition, the protection relay senses the fault and issues a trip command to the tripping circuit.

Some breakers have two tripping coils one is operated with 110 VDC and the other is operated with 220 VAC. This is done to ensure the tripping of the breaker in the case of failure of one of the supply systems. Two separate trip circuit supervision circuit is used in this case.

The basic circuit diagram of the trip circuit supervision is given below.

Trip Circuit Supervision Relay Working Function

The trip circuit supervision relay has three coils KM1, KM2, and TCS. To limit the current through KM1 and KM2 relay coils, resistance R is added. The relay monitors the healthiness of the trip circuit in the breaker in closed and open conditions. According to this, the trip circuit supervision function can be divided into two categories.

• Pre-Circuit Trip Circuit Supervision
• Post Close Circuit Supervision

Pre-Close Trip Circuit Supervision

Pre-close means breaker status before closing. The breaker is open in pre-close condition. Thus, the status of breaker contact 52a is open and contact 52b is close. In this condition, current through the trip circuit is as given below.

When a breaker is in open condition, the current does not flow through 52a contact. Current finds its path through breaker auxiliary NC contact, KM2 and KM1. Thus current flowing through KM1 and KM2 energizes both the relay. The positive supply routes through the contact of KM1 and KM2 and energizes the trip coil supervision relay(TCS relay). The NC contact of TCS gets NO and no annunciation window glow in this case. This shows that the trip circuit supervision circuit is healthy.

If both KM1 and KM2 relays do not operate, the TCS relay will not operate, and the contact of TCS will remain in the NC state. The window annunciation will glow in this case and, it shows that either supply is missing or Trip coil is open or there is a defect in the wiring of the trip circuit supervision circuit.

Post Close Trip Circuit Supervision

Post-close means that breaker is closed. The current through the contact 52a and 52b and trip coil is as given below.

Current will flow through the breaker auxiliary contact 52a and trip coil, and the relay KM1 will energize. The NO contact of KM1 will become NC and it will energize the TCS relay. The contact of TCS will get open and the annunciation window shows no fault.

In case of a fault in the supply system, KM1, TRIP COIL, and wiring, the contact of KM1 will remain in an open state and thus the TCS will be inoperative. The NC contact of TCS output the contact to the annunciation window which shows the breaker’s trip circuit is faulty.

• Master Trip Relay 86 Working Function and Significance of Master Trip Relay
• Difference Between Relay and Circuit Breaker
• Basic Concepts of the Safety Relay
• Phase Fault Protection
• Class-A, Class-B and Class-C Tripping Classification of Generator

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Electrical fundaz

Trip Circuit Supervision Relay Explained

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• A Breaker has a Closing Coil & A Tripping Coil. Now if a Closing Coil is Faulty, we can Close it Mechanically also. But Tripping is Automatic in the case of Fault and so when the Trip Circuit is Faulty, the Breaker won’t Trip  which  can have very bad consequences.
• If its a 22kv or 33 kv bkr, Tfr LV bkr will operate, which will result in unnecessary power interruption for other Feeders.
• If its 100 kv or 220 kv level, and if the breaker does not trip, LBB wil operate, tripping all the feeder in that section which will result in Huge Power Loss.

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• Post Close Element (95A)-  It is Energised when the Breaker is in ON Condition (Post Close Condition) & hence monitors the Healthiness of the TC in the Bkr is in ON cond. Permanant Positive is given to  one end of Coil of  95A and the other end of Coil of 95A is connected to the Tripping Coil through  NC Auxillary contact of the breaker. 

Pre Close Element (95B)-  It is Energised when the Breaker is in OFF Condition (PreClose Condition). Permanant Positive is given to  one end of Coil of  95B and the other end of Coil of 95B is connected to the Tripping Coil through  NO Auxillary contact of the breaker. 

• M ain Element (95C)-  Positive is given to the 95C through the parallely connected contacts of 95A & 95B. Permanant Negative is given to the other end of 95C. It is Energised when either 95A or 95B is Energised &  used for Annunciation purpose. It is a  reverse Flag Relays (Normally when the Relay is operated, we get an indication, but in the case of 95C Relay, when the Relay is not operated, we get the Indiction).
•   Resistances-  Current flowing in the TCH ckt is restricted with the help resistances placed in series with the TCH relays, so that the Tripping coil does not operate. Also, in case the TCS Element gets shorted, the current through TC is limited and breaker does not Trips.

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• Permanant Positive is given to  one end of Coil of  95A and now, the other end of Coil of 95A gets the Negative Voltage  coming through the Tripping Coil &  NC Auxillary contact of the breaker. Hence, 95A Relay gets operated and so its Contact is Closed and so Positive  is extended to the 95C Relay. As the 95C Relay is already given Negative and now it is gettig Positive and so it gets OPerated & so there are Faulty Indications & Breaker Closing Interlock is also Inactive. 
• Permanant positive is given to the 95 B Relay but it is not getting the Negative Voltage coming through the Coil, and it remains in Reset Condition.
• Positive is given to the 95C through the parallely connected contacts of 95A & 95B. Permanant Negative is given to the other end of 95C.

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Gretings of the Day…!

I was studying VAX 31 AREVA make TCS relay. It was explained very good manner.. But detailed circuit diagram not mentioned. Kindly provide the Circuit diagram followed by explanation.

The circuit what i’m having seems to be quite different.. where i’m mis leading with explanation.. If required i will share the same for clarification..

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Posted: ‎2023-01-23 01:47 AM . Last Modified: ‎2023-01-23 01:49 AM

Posted: ‎2023-01-23 02:57 PM

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• HighTECH Line
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MRA1 Trip circuit resp. control circuit supervision [74TC] (MRA1D)

Product information "MRA1 Trip circuit resp. control circuit supervision [74TC]"

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• Description
• Description The MRA1 relay of the HighTECH Line is used to supervise the tripping circuit of protective devices taking into consideratio More
• Features 19“ racks – fully withdrawable Door mounting – withdrawable and sealable Panel mounting – fully withdrawable Fault / disturba More
• Applications Interconnection of renewable energies (DER – distributed energy resources) to the public grid. Supervision of the trip circui More
• Links/Documents ↳ Documentation (Brochures & Manuals)↳ General HighTECH Line User Manual More

The MRA1 relay of the HighTECH Line is used to supervise the tripping circuit of protective devices taking into consideration the following protective criteria:

supervision of the auxiliary voltage for the tripping circuit and for the supply of protective devices

supervision of the tripping circuit with regard to cable break

supervision of the mechanical functions of the circuit breaker

19“ racks – fully withdrawable

Door mounting – withdrawable and sealable

Panel mounting – fully withdrawable

Fault / disturbance recorder

Intuitive HMI

Display (of primary values)

Easy setting software – Smart view

Compact form factor

Interconnection of renewable energies (DER – distributed energy resources) to the public grid.

Supervision of the trip circuit.

↳   Documentation (Brochures & Manuals)

↳   General HighTECH Line User Manual

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